Methods and apparatus for connecting openings formed in adjacent blood vessels or other anatomical structures

[0002] This patent application claims priority to U.S. Provisional Patent Application Ser. No. 60/010,614, filed on Feb. 2, 1996, and is a continuation-in-part of U.S. patent application Ser. No. 08/730,327, filed on Oct. 11, 1996 now U.S. Pat. No. 6,190,353 and Ser. No. 08/730,496, filed on Oct. 11, 1996 now U.S. Pat. No. 5,830,222, the entire disclosure of each such related application being expressly incorporated herein by reference.

[0003] The present invention relates generally to medical devices, and more particularly to methods and apparatus for making connections between blood vessels or other adjacently situated anatomical or synthetic structures having hollow lumens or cavities formed therein.

[0004] In modern medical practice, it is often desirable to form connections between adjacent anatomical passageways, or between adjacent segments of a single anatomical passageway. The types of anatomical passageways between which such connections may be made include; blood vessels, vas deferens, fallopian tubes, intestines, lymphatic ducts, grafts, ventricular cavities of the heart or brain, etc.

[0005] Recently, applicant has devised certain in situ vascular bypass procedures wherein blood flow passageways (e.g., puncture tracts or interstitial tunnels) are formed between the lumens adjacently situated blood vessels (e.g., between an obstructed coronary artery and an adjacent coronary vein) to bypass a diseased, injured or obstructed segment of one blood vessel. These procedures have previously been described in U.S. patent application Ser. Nos. 08/730,327 and 08/730,496. Also, Provisional U.S. Patent Application Ser. No. 60/010,614 particularly describes certain minimally invasive vascular grafting procedures devised by applicant for by-passing an obstructed artery. In these grafting procedures, a tubular graft (e.g., a segment of an endogenous blood vessel or a tube graft formed of natural or synthetic material) is maneuvered into juxtaposition with the obstructed artery. One or more openings are formed in the graft and the adjacent artery. The openings formed in the graft are then connected to the openings formed in the artery, such that blood may flow between the graft and the artery.

[0006] Additionally, various procedures have been reported by others wherein implantable apparatus are used to connect or facilitate flow of bodily fluid between anatomical passageways (e.g., genitourinary ducts). One such procedure is described in U.S. Pat. No. 3,042,021 (Read) entitled BYPASS TYPE INSERT PLUG FOR BODY PASSAGEWAY.

[0007] To facilitate the connection of adjacently situated anatomical structures, as in the above-mentioned medical procedures, there exists a need in the art for the design and development of new connector apparatus which may be implanted, through transluminal catheters or probes, to form a secure connection between openings formed in adjacently situated anatomical structures and/or to maintain such openings in direct alignment and/or fluidic communication with each other.

[0008] The present invention provides apparatus for connecting or joining a first opening formed in a first anatomical structure of the type having a hollow inner space or lumen (e.g., a blood vessel, a hollow organ, a chamber of the heart, a vascular graft, etc.) with a second opening formed in a second anatomical structure which also has a hollow innerspace of similar type. In general, these connecting apparatus comprise a) a first engagement member which is engageable with the first anatomical structure, b) a second engagement member which is engageable with the second anatomical structure, and c) a connecting portion which extends or traverses between the first and second engagement members, and serves to hold the openings formed in the first and second anatomical structures in the desired alignment, typically, such that fluid may pass from one anatomical structure into the other.

[0009] Further in accordance with the invention, the connecting apparatus may be initially deployable in a radially compact state such that it may be advanced transluminally through the body to a desired implantation site, and is subsequently transitionable to a radially expanded configuration wherein the first engagement member will engage the first anatomical structure and the second engagement member will engage the second anatomical structure. Additionally or alternatively, the first and second engagement members may be initially deployed in non-operative positions (e.g., extending generally parallel to the longitudinal axis of the apparatus) to facilitate transluminal passage and/or placement of the apparatus at the desired implantation site. Thereafter, the first and second engagement members may be transitionable to a second configuration (e.g., an outwardly splayed configuration) such that the first and second engagement members will engage the first and second anatomical structures, as desired. In this manner, the apparatus may be self expanding or self splaying (e.g., formed of resilient or shape memory material) such that the radial expansion or transitioning of the engagement members will occur when surrounding constraint (e.g., constraint of a surrounding catheter wall) has been removed from the apparatus. Alternatively, the apparatus may be plastically deformable and provided with a pressure-exerting tool (e.g., a balloon) which will plastically deform the apparatus to cause the desired radial expansion and/or transitioning of the engagement members after the apparatus has been positioned in its desired implantation site.

[0010] Further in accordance with the invention, the engagement members may comprise wire loops, wire members, flanges, extensions, tongues, or any other suitable type of member which will embed into or otherwise engage the adjacent surface of an anatomical structure so as to hold the apparatus at its desired implantation site and/or to maintain the patency of the passageway as well as the length of the connection.

[0011] Still further in accordance with the invention, the connecting portion of the apparatus may comprise one or more elongate strands or members, a solid or perforated tube, or any other suitable connecting portion which will serve to link or connect the first and second engagement members and hold them at their desired spaced-apart distance. In some embodiments, the connecting portion may be elastic or biased so as to exert continual pulling force or retraction against the first and second engagement members. In other embodiments, the connecting portion may be rigid and non-elastic so as to remain at a fixed non-alterable length. Additionally, in some embodiments, the connecting portion may define a cylindrical or annular support member which will dilate, support or otherwise maintain any surrounding interstitial tissue in a desired configuration so as to prevent blockage or non-patency of the flow path formed between the first and second openings in the first and second anatomical structures.

[0012] Additionally, the connecting portion may be constructed to maintain a minimum passageway diameter between the openings in the first and second anatomical structures. Also, the connecting portion may be constructed to perform some surface modeling or customization of the surrounding tissue as by mechanical pressure exertion, application of a coating or chemical treatment, xenograft, emission of energy, etc. In this manner, the delivery catheter or delivery system used to facilitate implantation of the correct connector apparatus may by equipped with wires, or other energy transmitting members which are in contact with the connector apparatus and which will deliver energy into the connector apparatus, thereby using the connector apparatus as an energy-transferring member for causing deburring, enlargement, scarring, or other modification of the surrounding tissue with which the connector comes in contact. Examples of the types of energy which may be useable for this purpose include electrical energy, radiofrequency, ultrasound, radiation (e.g, beta, gamma, etc.), etc.

[0013] Still further in accordance with the invention, the connecting portion of the apparatus may be elastic, adjustable, telescoping, distendible or of accordion construction, etc., so as to adjust or conform to passageways of differing length. This aspect of the invention will allow a connector apparatus to be used for applications wherein the distance between the first and second openings in the first and second anatomical structures may vary and in each specific application, to maintain the first and second anatomical structures in relatively constant tension (i.e., constant force). Alternatively, for connector apparatus which do not incorporate such longitudinal elasticity, adjustability, telescoping, distensible or accordion configuration, the connector apparatus may be provided in a variety of different lengths and the operator may select the appropriate length of the connector apparatus prior to installation.

[0014] Still further in accordance with the invention, the leading edge of the apparatus may be a sharpened cutting edge or may be otherwise adapted to cut or sever tissue, such that the delivery and advancement of the apparatus through the openings in the anatomical structures and/or the passageway created therebetween may further serve to form such openings or passageway, or to enlarge, customize, model or otherwise alter the tissue with which it comes in contact.

[0015] Still further in accordance with the invention, there are provided connector apparatus having a connecting portion which comprises legs or members which penetrate through tissue surrounding the openings formed in the anatomical structures and/or any intervening tissue located therebetween, such that the connecting portion of the apparatus is embedded within the host tissue and is actually located outside of the channel or passageway formed between the first and second openings in the first and second anatomical structures.

[0016] Still further in accordance with invention, there are provided delivery systems and devices for delivering and implanting the connector apparatus of the present invention. These delivery apparatus and devices are typically incorporated into or mounted upon a transluminally advanceable catheter, and comprise a retractable sheath, inflatable balloon, push rod, alter-apposing slider sheaths, or rotatable members which operate to radially expand or advance the connector apparatus into its desired implantation position within the body.

[0017] These and other elements and objects of the present invention will be more fully understood and appreciated upon reading of the detailed description of preferred embodiments set forth herebelow, and studying of the accompanying drawings wherein the preferred embodiments are shown.

[0018] FIG. 1 is a partial longitudinal sectional view of two adjacently positioned blood vessels having a blood flow passageway formed therebetween, and a connector apparatus of the present invention implanted within such blood flow passageway to facilitate and maintain the desired side-to-side connection between the blood vessels.

[0019] FIG. 2 is a perspective view of a coil-type connector apparatus of the present invention.

[0020] FIG. 2′ is a perspective view of a modified coil-type connector apparatus of the present invention.

[0021] FIG. 2″ is a perspective view of another modified coil-type connector apparatus of the present invention having a tubular mid portion.

[0022] FIG. 2′″ is a perspective view of another coil-type connector apparatus of the present invention having a fused mid-portion.

[0023] FIG. 2″″ is a side elevtional view of a helical coil connector apparatus of the present invention which is biased to a longitudinally collapsed configuration.

[0024] FIG. 3 is a perspective view of a mesh type connector apparatus of the present invention.

[0025] FIG. 3′ is a perspective view of a mesh type connector apparatus of the present invention having optional engagement members formed on either end thereof.

[0026] FIG. 3″ is a perspective view of the mesh type connector apparatus of FIG. 3′ wherein the engagement members are self-splaying.

[0027] FIG. 3′″ is a perspective view of the mesh type connector apparatus of FIG. 3′ wherein the engagement members are pressure-splayable, and wherein the apparatus is shown in conjunction with a pressure-exerting balloon catheter which is useable to splay the engagement members at the desired implantation site.

[0028] FIG. 4 is a perspective view of a tube type connector apparatus of the present invention.

[0029] FIG. 4′ is a perspective view of a tube type connector apparatus of the present invention having optional engagement members formed on either end thereof.

[0030] FIG. 4″ is a perspective view of the tube type connector apparatus shown in FIG. 4′, wherein the engagement members are self-splaying.

[0031] FIG. 4′″ is a perspective view of the tube type connector apparatus shown in FIG. 4′, wherein the engagement members are pressure-splayable, and wherein the apparatus is shown in conjunction with a pressure-exerting balloon catheter which is useable to cause splaying of the engagement members at the desired implantation site.

[0032] FIG. 5 is a perspective view of a cylindrical connector apparatus of the present invention comprising a solid (non-perforated) tube member having optional engagement members formed on either end thereof.

[0033] FIG. 5′ is a perspective view of a non-hyperbolic, cylindrical connector apparatus wherein the engagement members are self-splaying.

[0034] FIG. 5″ is a perspective view of a cylindrical connector apparatus wherein engagement members are pressure-splayable, and wherein the apparatus is shown in conjunction with a pressure-exerting balloon-catheter which is usable to cause splaying of the engagement members at the desired implantation site.

[0035] FIG. 5′″ is a perspective view of a cylindrical connector apparatus wherein the tube member is formed of wire mesh having a multiplicity of openings or perforations formed therein, and multiple engagement members are formed on both ends of the tube member;

[0036] FIG. 5″″ is a perspective view of a cylindrical connector apparatus wherein the tube member is formed of wire mesh having a multiplicity of openings or perforations formed therein, and two (2) engagement members are formed on each end of the tube member, said engagement members being in direct alignment with one another;

[0037] FIG. 5′″″ is a perspective view of a cylindrical connector apparatus wherein the tube member is formed of a solid tube, and wherein engagement members comprising semi-circular wire projections are mounted on either end of the tube member;

[0038] FIG. 6 is a perspective view of a two-piece rivet-type connector apparatus of the present invention having a first rib-in-groove connection system formed thereon.

[0039] FIG. 6′ is a perspective view of an alternative two-piece rivet-type connector apparatus of the present invention having a tapered friction-fit engagement system formed thereon.

[0040] FIG. 6″ is a perspective view of another alternative two-piece rivet-type connector apparatus of the present invention having a second rib-in-groove or magnetic type engagement system formed thereon.

[0041] FIG. 7ais a top plan view of a first elastomeric connector apparatus of the present invention comprising a tubular mid-portion having elastomeric engagement members formed at either end thereof.

[0042] FIG. 7a′ is a perspective view of the elastomeric connector apparatus of FIG. 7a.

[0043] FIG. 7bis a top plan view of another elastomeric connector apparatus of the present invention comprising a tubular mid portion having a non-circular lumen and engagement flanges formed at either end thereof.

[0044] FIG. 7b′ is a perspective view of the connector apparatus shown in FIG. 7b.

[0045] FIG. 7cis a perspective view of a connector apparatus of the present invention comprising an elastomeric body having wire support members formed therein.

[0046] FIG. 7dis a perspective view of a wire connector apparatus of the present invention.

[0047] FIG. 7d′ is a perspective view of the wire connector apparatus of FIG. 7dhaving a cylindrical elastomeric or fabric sleeve formed thereon.

[0048] FIG. 7d″ is a perspective view of another wire connector apparatus formed of two of the connector apparatus of FIG. 7d, coupled together to form a singular apparatus.

[0049] FIG. 8 is a perspective view of a sinusoidal wire connector apparatus of the present invention in a flattened configuration, prior to fabrication into its desired final configuration.

[0050] FIG. 8ais a perspective view of the sinusoidal wire connector apparatus of FIG. 8 following fabrication of into its desired final configuration, and showing the apparatus in a preferred implantation position forming a connection between adjacent tubular anatomical conduits.

[0051] FIG. 9 is a perspective view of a triplet coil type connector apparatus of the present invention, showing the apparatus in a preferred implantation position forming a connection between adjacent tubular anatomical conduits.

[0052] FIG. 10 is a longitudinal sectional view of a flanged tube connector of the present invention in a preferred implantation position forming a connection between adjacent tubular anatomical conduits.

[0053] FIG. 10ais a perspective view of a segment of tubing which has been precut for fabrication into the flanged tubular connector apparatus of FIG. 10.

[0054] FIG. 10bis a side elevational view of the pre-notched segment of tubing shown in FIG. 10a.

[0055] FIG. 11ais a perspective view of a first embodiment of a flanged roll-up connector apparatus of the present invention.

[0056] FIG. 11bis a perspective view of a second embodiment of a flanged roll-up connector apparatus of the present invention.

[0057] FIG. 11cis a perspective view of a flanged cylindrical connector apparatus of the present invention.

[0058] FIG. 12 is a perspective view showing the manner in which any of the connector apparatus of the present invention may be modified to form a non-perpendicular connection between adjacent anatomical structures.

[0059] FIG. 13 is a perspective view of a segment of myocardium showing an alternative application of the connector apparatus of the present invention to form a connection between a coronary blood vessel and a chamber of the heart.

[0060] FIG. 14ais a schematic showing of a retractable sheath type delivery catheter useable to deliver connector apparatus of the present invention.

[0061] FIG. 14bis a schematic showing of an inflatable balloon type delivery catheter useable to deliver connector apparatus of the present invention.

[0062] FIG. 14cis a schematic showing of a push rod type delivery catheter useable to deliver connector apparatus of the present invention.

[0063] FIG. 14dis a schematic showing of an alter-apposing slider sheath type delivery catheter useable to deliver connector apparatus of the present invention.

[0064] FIG. 14eis a schematic showing of a rotatable delivery catheter useable to deliver and implant connector apparatus of the present invention.

[0065] FIG. 15ais a showing of a two-piece connector apparatus as described and claimed in parent application Ser. No. 08/730,327, modified to illustrate the manner in which the connecting portion of the connector apparatus may protrude through tissue and lay outside of the passageway which has been formed between the adjacent anatomical structures.

[0066] FIG. 15a′ is an exploded view of the connector apparatus shown in FIG. 15a.

[0067] The following detailed description and the drawings to which it refers are provided for the purpose of describing and illustrating presently preferred embodiments of the invention, and are not intended to limit the scope of the claims in any way.

[0068] It is to be understood that each of the structural elements attributes and components shown in the drawings for an embodiment may be incorporated into or combined with any or all of the other embodiments of the invention, so long as such negation may be accomplished without negating the utility or functionality of that embodiment.

[0069] Furthermore, it is to be appreciated that no effort has been made to exhaustively describe and illustrate each and every possible embodiment of the invention having each and every possible design or structure feature combineable therewith.

[0070] Specifically, the following elements, adaptations or structural attributes may be incorporated into any or all of the embodiments described herein, irrespective of whether such elements, adaptations or attributes are specifically shown in any of the drawings.

[0071] 1. Radio-opaque construction or radio-opaque markings to enable the connector to be visualized by fluoroscopy, x-ray or Roentgenographic techniques;

[0072] 2. Non-obstructive or minimally obstructive to flow of fluid through the openings in the anatomical structures between which the connection is formed;

[0073] 3. Non-thrombogenic or antithrombogenic when used in blood-contacting applications and/or anti-infective or anti-microbial and/or radioactive so as to deter neointimal growth or natural closure or narrowing of the passageway.

[0074] 4. Capable of withstanding the range of pressures which will be encountered in the intended anatomical application, such as pressures 140-180 mmhg in applications wherein connections between arteries or an artery and vein are formed;

[0075] 5. Capable of being operatively installed without causing significant necrosis or enhancing or inducing proliferation of tissue surrounding the connector apparatus;

[0076] 6. Capable of expanding/contracting or otherwise adapting to compliance changes between the connected anatomical structures;

[0077] 7. The portions of the connector apparatus which abut against or engage the luminal or inner wall of each anatomical structure may be shaped to conform to that luminal or inner wall (e.g., engagement members of flanges may be hemi-cylindrically bowed or cupped to conform to the wall of a blood vessel to which connection is made.

[0078] 8. The connector apparatus may be structured or designed to maintain a desired cross-sectional dimension or diameter of the openings formed in the adjacent anatomical structures and any interstitial passageway formed between such openings; and

[0079] 9. The connector apparatus may preferably be formed of a continuous or single structural element having minimal likelihood of breakage or dismemberment after implantation.

[0080] 10. Capable of incorporating a flow control element or value (e.g., a one-way check valve) to control or maintain a specific pattern or type of flow (e.g., unidirectional flow) through the passageway.

[0081] 11. The connection portion of the connector apparatus may be adapted to form passageways of various shapes (eg., cylindrical, ovoid, arcuate).

[0082] 12. Capable of being removed after implantation.

[0083] 13. The connector apparatus may be constructed with varying amounts of structural support or scaffolding, or may incorporate intraluminally placed structural or non-structural elements which will retard or restrain neointimal growth or natural closure or narrowing of the passageway.

[0084] 14. The connector apparatus will preferably be capable of withstanding all forces (e.g., hemodynamic pressures, muscular contractions or other forces created by movement or impact of the body) which will be encountered following implantation, without resultant adverse effect (e.g., breakage, dislodgement, slippage, movement or other untoward affect on the connector apparatus).

[0085] 15. The connector apparatus may be constructed and configured so as to apply residual forces to compress or otherwise minimize the length of the passageway between the first and second anatomical structures following implantation.

[0086] 16. The connector apparatus may be adapted to receive and transmit energy supplied through the delivery apparatus (e.g., delivery catheter). Such energy may serve to modify the surrounding tissue which defines the openings in the first and second anatomical structures as well as any passageway created between interstitial tissue which resides between the anatomical structures.

[0087] 17. The connector apparatus may be configured to control or define the geometric shape of the passageway so as to maximize flow performance and/or to minimize adverse flow conditions such as turbulence.

[0088] 18. The connector apparatus may be constructed to support rotational twisting and torsion without adverse effects.

[0089] With reference to the drawings, FIG. 1 provides a general showing of the manner in which the connector apparatus 10 of the present invention is implanted or installed within openings formed in adjacent blood vessels BV₁, BV₂to maintain side-by-side connection and direct alignment of the side wall openings formed in the blood vessel BV₁, BV₂. The blood vessels BV₁, BV₂may be endogenous arteries and/or veins in their natural anatomical positions, or may constitute one endogenous artery or vein having a synthetic or biological tube graft placed in juxtaposition thereto.

[0090] i. Coil Connectors

[0091] FIGS. 2-2′″ show several variations of a first embodiment 10aof the connector apparatus of the present invention. Each of the variants shown in FIGS. 2-2′″ comprise a helical coil formed of resilient or superelastic wire 12, such coil having opposite ends of a first diameter D₁and a mid-portion of a second diameter D₂. The second diameter D₂of the mid-portion of the coil is smaller than the first diameter D₁of the ends, such that the apparatus 10ais generally of all hyperbolic or “hourglass” shape. However, it will be appreciated that other embodiments may also be provided, rather than the hyperbolic or hourglass shape shown in the drawings, the coil is of a cylindrical or frusto-conical shape and is provided with additional engagement members which extend laterally outward from the opposite ends of the coil. The wire 12 of which the apparatus, 10ais formed is sufficiently resilient or superelastic in the range of temperatures in which the apparatus 10ais used (i.e., at room temperature and body temperature) to allow the apparatus 10ato be initially radially compressed (and concurrently longitudinally elongated) into a relatively small diameter, compact configuration which may be inserted into the lumen of a delivery catheter. The delivery catheter is then advanced through the desired anatomical passageway (e.g., blood vessel BV₁or BV₂such that an opening of the catheter is located within the region between the side wall openings in the adjacent anatomical conduits or blood vessels BV₁, or BV₂. Thereafter, the apparatus 10ais expelled out of the catheter and permitted to resiliently or elastically reassume its hyperbolic or hourglass configuration, such that the ends of the first diameter D₁will engage the walls of each anatomical conduit or blood vessels BV₁, BV₂and the mid-portion diameter D₂will reside within the space or tissue tunnel created between the side wall of openings in the adjacent anatomical conduits or blood vessels BV₁, BV₂.

[0092] In the connector apparatus 10ashown in FIG. 2, the entire apparatus 10ais formed of a tightly wound helical wire coil such that each adjacent convolution of the wire 12 is in close juxtaposition or abutment to the adjacent convolution thereof. This provides a hyperbolic coil of substantially continuous construction, as shown in FIG. 2.

[0093] FIG. 2′ shows a variant of the first embodiment of the connector apparatus 10awherein the resilient or superelastic wire 12 is tightly wound at either end such that multiple adjacent convolutions of the wire are closely spaced or in direct abutment at either end of the apparatus 10a′, while the mid-portion of the apparatus D₂comprises a more loosely wound traversing segment 14 comprising a single strand of the wire 12 which extends from the abutting convolutions at one end of the apparatus 10a′ to the abutting convolutions at the other end of the apparatus 10a′.

[0094] In the variant shown in FIG. 2″, the apparatus 10a″ comprises tightly wound helical wire coil segments of generally spiral or frusto-conical configuration located at either end, with a tubular sleeve 16 forming the mid portion of the apparatus 10a″. This tubular sleeve 16 may be formed of tubular plastic material such as polytetrafluoroethylene (PTFE), expanded polytetrafluoroethylene (EPTFE) polyethylene (PE), silicone, polyurethane (PU), or polyester. Alternatively, the tubular sleeve 16 may be formed of natural, autologus or xenograft material. The spiral or frusto-conical wire coil segments located at either end of the apparatus 10a″ may comprise the opposite ends of a continuous wire coil which extends through the lumen of the tubular sleeve 16, or may comprise two separate, non-continuous coil segments each of which is affixed or mounted to one end of the tubular sleeve 16.

[0095] The variant of the connector apparatus 10a′″ shown in FIG. 2′″ comprises a continuous, tightly wound helical coil of resilient or superelastic wire 12 which is similar in configuration to that shown in FIG. 2, but wherein two or more adjacent convolutions of the wire 12 at the mid-portion of the apparatus 10a′″ have been welded, adhered or otherwise fused to one another to form a continuous, tubular mid-portion of diameter D₂. Such fusion of the adjacent convolutions of wire 12 forming the mid-portion of the apparatus 10a′″ may comprise weldments 18, or adhesive or any other suitable fusion material capable of welding adhering or otherwise fusing the adjacent convolutions of wire 12 to one another.

[0096] It will be appreciated that many of the embodiments of the connector apparatus 10 of the present invention may be constructed so as to be biased to a longitudinally shortened or longitudinally collapsed configuration so as to longitudinally compress or confine the tissue between the first and second openings formed in the first and second anatomical structures or blood vessels BV₁BV₂. FIG. 2″″ shows an example of this concept, as applied to the helical coil connector of FIG. 2. As shown in FIG. 2″″, the helical coil connector 10a″″, when in its relaxed state, has a longitudinally compact configuration wherein the first and second ends of the coil are close-spaced. When this embodiment of the connector apparatus 10a″″ is implanted within the first and second openings formed in the first and second anatomical structures or blood vessels BV₁, BV₂, the opposite ends of the connector apparatus 10a″″ will engage the openings in the adjacent anatomical structures or blood vessels BV₁, BV₂and will conform to the length of the channel formed therebetween. In this manner, the resilient nature of the coil will tend to urge or pull the opposite ends of the coil inwardly, thereby longitudinally compressing or constraining the tissues which are located between the opposite ends of the coil. It should be noted, however, that the force exerted by the coil is preferably not to great as to cause undesirable tissue necrosis or undesirable proliferation of tissues which are longitudinally compressed or constrained by this embodiment of the apparatus 10a″″. It will be further appreciated that the biasing of the connector apparatus 10a″″ to such longitudinally compact configuration will enable the connector apparatus 10a″″ to be used in channels or passageways of varying length, thereby eliminating the need for providing manufacturing and stocking a variety of such connector apparatus 10a″″ having differing lengths.

[0097] ii. Mesh Connectors

[0098] FIGS. 3-3′″ show several variants of tubular mesh connector apparatus lob having inwardly arched (e.g., hyperboloidal side walls.)

[0099] FIG. 3 shows a basic hyperbolic mesh connector apparatus 10bwhich comprises a tube formed of wire mesh having an inwardly arched, hyperboloidal or “hourglass” configuration. However, it will be appreciated that the wire mesh connectors may alternatively be of cylindrical or frusto-conical configuration with additional engagement members or projections extending laterally outward from the opposite ends of such cylindrical or frusto-conical mesh tube. This embodiment of the connector apparatus 10bhas distal ends of a first diameter D₁and a second diameter D₂. The diameter D₂of the mid-portion is smaller than the diameters D₁of the ends, thereby providing the desired hyperbolic or hourglass configuration. The mesh structure of the apparatus 10bis preferably formed of a multiplicity of wire segments 18 which are interwoven into the desired mesh structure. The wire segments 18 may be formed of a resilient or superelastic wire material so as to render the apparatus 10bradially compressible (and concurably longitudinally elongatable) to a reduced diameter capable of being positioned within a delivery catheter, and to subsequently allow the apparatus 10bto resiliently self-expand to its desired hyperbolic or hourglass configuration of diameters D₁and D₂after having been expelled from the constraining catheter or other delivery device. In some applications, the hyperbolic or hourglass configuration of the apparatus 10bwill be such that the end portions of diameter D₁will engage the walls of the adjacent anatomical passageways or blood vessels BV₁, BV₂, so as to hold the apparatus 10bin the desired position between the anatomical passageways or blood vessels BV₁, BV₂. In other embodiments as show, in FIGS. 3′, 3″, and 3′″, one or more splayable engagement members 20 may be formed on one or both ends of the wire mesh tube to facilitate engagement of the opposite ends of the apparatus 10bto the walls of the connected anatomical passageways or blood vessels BV₁, BV₂.

[0100] FIG. 3′ shows a variant of the apparatus 10b′ having wire loop type engagement members 20 formed on both ends thereof. Initially, as shown in FIG. 3′, the wire loop type engagement members 20 will be deployed in extended positions such that they extend longitudinally from either end of the wire mesh tube and are parallel or close to parallel to the longitudinal axis LA of the apparatus 10b′. These engagement members 20 may be formed of resilient or spring material so as to be self splaying (FIG. 3″) or may be formed of bendable or malleable material so as to be pressure-splayable (FIG. 3′″).

[0101] With reference to the particular variant FIG. 3″, the resilient or self-splayable engagement members 20 will, when released from the surrounding constraint of the delivery catheter, self-splay (i.e., curve outwardly) to their desired engagement positions wherein such engagement members 20 may be generally perpendicular or near perpendicular to the longitudinal axis LA of the device 10b″.

[0102] With reference to FIG. 3′″, in embodiments wherein the engagement members 20 are formed of plastically deformable or malleable metal or other material which is pressure-deformable, the apparatus 10b′″ will be initially positioned within the adjacent openings formed in the first and second anatomical passageways or blood vessels BV₁, BV₂such that the engagement members 20 formed on one end of the apparatus 10b′″ protrude or extend into the lumen of the first anatomical passageway or blood vessel BV₁and the engagement members 20 on the opposite end of the apparatus 10b′″ protrude or extend into the lumen of the second anatomical passageway or blood vessel BV₂. A pressure exerting apparatus, such as the dual balloon catheter 24 shown in FIG. 3′″, is then utilized to exert, pressure against the engagement members 20 to cause the engagement members to splay or deform outwardly to positions which are substantially perpendicular or near perpendicular to the longitudinal axis LA of the apparatus 10b′″, or such that the engagement members will embed or hook into the adjacent tissue of the anatomical structure. In this manner, the engagement members 20 may abut against or enter the adjacent walls of the first and second passageways or blood vessels BV₁, or BV₂. One type of dual balloon catheter 24 useable for this purpose comprises an elongate pliable catheter 26 having a singular dumbbell-shaped or hour glass shaped balloon or the combination of a first balloon 28 and a second balloon 30 formed at spaced apart location thereon, as shown. The first balloon 28 and second balloon 30 are spaced apart or separated by a distance which is equal to, or bears a predetermined relationship to, the length of the apparatus 10b′″ such that the first balloon 28 may be positioned within and adjacent the longitudinally extended engagement members 20 on one end of the apparatus 10b′″ and the second balloon 30 may be positioned within and adjacent the longitudinally extended engagement members 20 on the other end of the apparatus 10b′″. Thereafter, the first and second balloons 28, 30 are inflated causing them to exert pressure against the engagement members 20 on both ends of the apparatus 10b′″, resulting in the desired splaying or bending of the engagement members 20 to their engagement positions wherein they are generally in apposition to, or embedded in, the wall(s) of the anatomical structure on either side of the channel. Thereafter, the first balloon 28 and second balloon 30 are deflated and the catheter 26 is removed, leaving the connector apparatus 10b′″ in its installed and implanted location between the first and second passageways or blood vessels BV₁, BV₂.

[0103] iii. Tube Connectors

[0104] FIGS. 4-4′″ show several variants of a tube connector apparatus 10c10c′″ which generally comprises a segment of radially compressible or collapsible resilient tube member 30 having inwardly arched, hyperboloidal or “hourglass” shaped side walls having opposite ends of a first diameter D₁and a mid-portion of a second diameter D₂. It will be appreciated, however, that the tube may alternatively be of cylindrical or frusto-conical shape with additional engagement members which extend laterally outward from either end of the tube, which may not require expansion for placement.

[0105] Specifically, FIG. 4 shows a connector apparatus 10cwhich comprises a hyperbolic or hourglass shaped tube member 36 which is positionable within side openings formed in two adjacent anatomical passageways (e.g., blood vessels BV₁, BV₂) such that one end of the tube member 36 having diameter D₁will engage the luminal surface of one of the passageways or blood vessels BV₁and the other end of the tube member 36 also of diameter D₁will engage the luminal surface of the other passageway of blood vessel BV₂. The outwardly tapered or enlarged diameters of the ends of the tube members thus serve to engage the anatomical passageways or blood vessels BV₁, BV₂without the need for additional flanges, projections or other engagement members on either end of the tube member 36.

[0106] FIG. 4′ shows the hyperbolic tube member 36 of FIG. 4 with optional engagement members 20 formed on both ends thereof. These engagement members 20 may comprise flanges, tabs, or, as shown, splayable wire loops. These engagement members 20 are initially disposed such that they extend longitudinally from either end of the hyperbolic tube member 36 and are parallel or close to parallel to the longitudinal axis LA of the tube member 36. After the tube member 36 has been placed in its desired position between the two anatomical passageways or blood vessels BV₁, BV₂, the engagement members 20 are caused to splay outwardly such that they become perpendicular or close to perpendicular to the longitudinal axis LA of the tube member 36, as shown in FIGS. 4″ and 4′″. The engagement members 20 may be formed of resilient, superelastic, shape memory or spring material so as to be self-splayable (FIG. 4″) or may be formed of bendable or plastically deformable material so as to be pressure-splayable (FIG. 4′″).

[0107] With reference to FIG. 4″, a self-splayable embodiment of the apparatus 10ccomprises engagement members 20 which, when relieved of the surrounding constraint of a delivery catheter or other delivery apparatus, will self-splay to their outwardly deployed positions wherein they are generally perpendicular or close to perpendicular to the longitudinal axis LA of the apparatus 10c″.

[0108] With reference to FIG. 4′″, there is shown an embodiment of the apparatus 10c′″ wherein the engagement members 20 are pressure-splayable. This embodiment of the apparatus 10c′″ is initially positioned such that the engagement members 20 on one end of the apparatus 10c′″ extend into the lumen of one anatomical passageway or blood vessel BV₁, and the engagement members 20 on the other end of the apparatus 10c′″ extend into the lumen of the second anatomical passageway or blood vessel BV₂. A pressure exerting apparatus, such as the above-described balloon catheter 26 having first and second balloons 28, 30, is then utilized to exert pressure upon the engagement members 20 to cause the engagement members to move from their longitudinally extended positions (FIG. 4′) to their outwardly splayed (i.e., operative positions wherein they are generally perpendicular or close to perpendicular to the longitudinal axis LA of the apparatus 10c′″. Thereafter, the balloons 28, 30 of the balloon catheter 26 or other pressure-exerting elements of any suitable pressure-exerting tool are deflated or otherwise disengaged and the catheter 26 is removed, thereby leaving the apparatus 10cin its desired position between the first and second anatomical passageways or blood vessels BV₁, BV₂, with the engagement members 20 in direct abutment with the lumen surfaces of the respective first and second passageways or blood vessels BV₁, BV₂.

[0109] iv. Cylindrical Connectors with Engagement Surface

[0110] FIGS. 5-5′ show several variants of a cylindrical connector apparatus 10bof the present invention. This cylindrical connector apparatus 10bgenerally comprises a cylindrical, tubular mid-portion 38 of substantially constant diameter, in combination with one or more engagement members formed on either end thereof. The engagement members 20 may comprise splayable wire loops as shown in the drawings, or any other suitable type of flange, lip, tab or other member capable of abutting against the luminal wall of an anatomical passageway or blood vessel BV₁, BV₂to prevent longitudinal slippage or movement of the tubular mid-portion in at least one direction. In this manner, the formation and deployment of such engagement member on either end of the tubular mid-portion 38 will anchor and hold the tubular mid-portion 38 in its desired implantation position between the openings formed in the adjacent passageways of blood vessels BV₁and BV₂.

[0111] The tubular mid-portion 38 of the apparatus 10dmay comprise a tube of resilient plastic, woven dacron or any other suitable material which is collapsible to a small diameter so as to be initially packed within the lumen of a delivery catheter, and which is subsequently radially expandable or unfoldable to a desired diameter D such that blood or other bodily fluid may flow through the cylindrical tubular member 38 from one anatomical passageway or blood vessel BV₁into another anatomical passageway or blood vessel BV₂. Alternatively, it will be appreciated that the tubular mid-portion 38 may be a rigid or semi-rigid tube formed of metal, carbon or alloy which is generally not radially expandable, but which is provided with additional engagement members which may be splayed or extended from opposite ends of the tubular mid-portion 38 to engage or embed within the adjacent tissue of the anatomical structure. These rigid or semi-rigid tubular mid-portions 38 may be of any suitable shaped configuration, including cylindrical, frusto-conical or hyperbolic (e.g., hourglass) shape.

[0112] The engagement members 20 are preferably initially disposed in positions wherein they are longitudinally extended from either end of the cylindrical tubular mid-portion 38 generally parallel or close to parallel to the longitudinal axis LA of the apparatus 10das shown in FIG. 5. The engagement members 20 may be formed of resilient, superelastic, shape memory or spring material so as to be self-splayable (FIG. 5) or may be formed of bendable or plastically deformable material so as to be pressure-splayable (FIG. 5″) With reference to FIG. 5′, a self-splayable embodiment of apparatus 10dcomprises engagement members 20 which, when relieved of the surrounding constraint of the delivery catheter or other delivery apparatus, will self-splay to their outwardly deployed position wherein they are generally perpendicular or close to perpendicular to the longitudinal axis LA of the apparatus 10b′.

[0113] With reference to FIG. 5″, in embodiments of the apparatus 10b″ wherein the engagement members 20 are pressure-splayable. This embodiment of the apparatus 10b″ is initially positioned such that the engagement members 20 on one end of the apparatus 10b″ extend into the lumen of one anatomical passageway or blood vessel BV₁and the engagement members 20 on the other end of the apparatus 10b″ extend into the lumen of the second anatomical passageway or blood vessel BV₂. A pressure exerting apparatus, such as the above-described balloon catheter 26 having first and second balloons 28, 30, is then utilized to exert pressure upon the engagement members 20 to cause the engagement members to move from their longitudinally extended positions (FIG. 5) to their outwardly splayed (i.e., operative) positions wherein they are generally perpendicular or close to perpendicular to the longitudinal axis LA of the apparatus 10d″ (FIG. 5″). Thereafter, the balloons 28, 30 of the balloon catheter 26 or other pressure-exerting elements of any suitable pressure-exerting tool are deflated or otherwise disengaged and the catheter 26 is removed, thereby leaving the apparatus 10d″ in its desired position between the first and second anatomical passageways or blood vessels BV₁, BV₂with the engagement members 20 in direct abutment with the respective first and second passageways or blood vessels BV₁, BV₂.

[0114] v. Rivet Type Connector Apparatus

[0115] FIGS. 6-6″ show several variants of rivet type connector apparatus which comprise a first tubular member 40 having a first engagement flange 44 formed thereon and a second tubular member 42 having a second engagement flange 46 formed thereon. The first and second tubular members 40, 42 are connectible to one another such the lumens of the tubular members 40, 42 are in direct alignment thereby forming a singular lumen 41 through the center of the apparatus 10e, 10e′, 10e″.

[0116] Various snap-fitting or frictional engagement systems may be utilized to securely connect the first and second tubular members 40, 42 to one another, and examples of such snap-fitting or frictional engagement systems are shown in the showings of FIGS. 6, 6′ and 6″.

[0117] With specific reference to FIG. 6, there is provided an annular groove 48 in the outer surface of the first tubular member 40 and a corresponding raised ridge 50 in the outer surface of the second tubular member 42. The raised ridge 50 is sized and configured to snap fit and seat within the groove 48 as the first tubular member 40 is advanced into the interior of the second tubular member 42. When the annular ridge 50 is seated within the corresponding groove, the respective engagements 44, 46 will be held in fixed spaced-apart relation to one another such that the distance between flanges 44, 46 will result in engagement of the flanges with the respective luminal walls of the anatomical passageways or blood vessels BV₁, BV₂which are intended to be connected by the apparatus 10e.

[0118] FIG. 6′ shows another connector apparatus 10ecomprising a first tubular member 40′ and a second tubular member 42′. Engagement flanges 44′, 46′ are formed about the outer ends of the first and second tubular members 40′, 42′, respectively. When the non-flanged end of the first tubular member 40′ is advanced into the non-flanged end of the second tubular member 42′, the respective lumens of the two tubular members 40′, 42′ will be in direct alignment so as to form a single continuous lumen 41 through the center of the apparatus 10e′. The outer surface of the first tubular member 40 is tapered inwardly toward the non-flanged end such that, as it is advanced into the interior of the second tubular member 42′, the outer surface of the first tubular member 40′ will tighten against and frictionally engage the inner surface of the second tubular member 42′, thereby holding the first and second tubular members 40′, 42′ in fixed, connected relation to one another such that the engagement flanges, 44′, 46′ are held in spaced-apart relation such that the distance there between will cause the flanges 44′, 46′ to be in abutting contact with the respective luminal surfaces of the first and second passageways or blood vessels BV₁, BV₂.

[0119] vi. Elastomeric Connector Apparatus

[0120] FIGS. 7a-7d′ show examples of connector apparatus 10h, 10iof the present invention formed of elastomeric materials such as a resilient elastomeric polymer (e.g., polyurethane, silicone, etc.).

[0121] In particular, FIGS. 7a, 7a′ show an embodiment of a connector apparatus 10hcomprising an elastomeric, cylindrical tube 60 having a hollow lumen 62 extending longitudinally therethrough and four engagement members in the nature of tabs formed on opposite ends of the tube 60 and extending outwardly therefrom in directions which are substantially perpendicular to the longitudinal axis LA of the tube 60.

[0122] FIGS. 7b, 7b′ show another embodiment of a connector apparatus 10iwhich comprises an ovoid tube member 70 formed of elastomeric material and substantially rectangular engagement members 74 in the nature of flanges formed on either end thereof. The engagement members 74 extend in directions which are parallel to the length-wise axis of the ovoid lumen 72 of the ovoid tube member 70, as shown. The provision of the ovoid tube member 70 having the ovoid lumen 72, and the corresponding configuration and directional orientation of the engagement members 74 will enable this embodiment of the connector apparatus 10ito be utilized in blood vessels or anatomical passageways of relatively small diameter, with openings which are elongate or ovoid so as to permit a greater amount of body fluid to flow through the openings than would be possible than if the openings were of a circular configuration. This is due to the fact that the maximum diameter of any circular opening formed in the side wall of a passageway or blood vessel BV₁, BV₂cannot exceed the diameter of the passageway or blood vessel BV₁, BV₂, while elongate or ovoid openings may have a width which is equal to or slightly less than the diameter of the passageway or blood vessel BV₁, BV₂and a length which is larger than the diameter of such passageway or blood vessel BV₁, BV₂. This tube member 70 may also incorporate any suitable reinforcing material, such as wire. This ovoid or non-circular configuration of the tube member 70 and its lumen 72 may be incorporated into any of the embodiments of the invention described herein, and is not necessarily limited to the particular elastomeric embodiment shown in FIGS. 7b, 7b′.

[0123] In each of these elastomeric embodiments shown in FIGS. 7a, 7a′, 7b, 7b′, the material of which the apparatus 10h, 10iis formed is sufficiently resilient and compressible to be initially packed into the lumen of a delivery catheter, and is sufficiently resilient such that when the apparatus 10h, 10iis expelled or otherwise passed out of the delivery catheter, the absence of restraint upon the apparatus 10h, 10iwill allow the apparatus to assume its fully expanded and operative configuration as shown in the figures. When in such fully expanded and operative configuration, the abutment members 64 or 74 will abut against the lumenal surfaces of the passageways or blood vessels BV₁, BV₂, in the regions immediately surrounding the openings formed therein, and the tube members 60, 70 of the apparatus 10h, 10iwill extend between the respective passageways or blood vessels BV₁, BV₂, thereby forming a conduit or passageway between the openings formed in the passageways or blood vessels BV₁, BV₂.

[0124] vii. Wire Connector Apparatus with Optional Covering

[0125] FIGS. 7c-7d′ show examples of wire connector members with optional coverings formed thereon. These coverings may cover all or any portion of the apparatus. For example, such covering may be formed on the connecting portion or mid-portion of the apparatus so as to form a sleeve or covering which lines the passageway, while the engagement portions (e.g., extendable engagement members) of the apparatus may remain devoid of such covering. Such coverings may be formed of any suitable material including, but not limited to, elastomeric material, fabrics (e.g., woven polyester) or natural materials such as autologus or xenograft material.

[0126] With specific reference to the embodiment shown in FIG. 7c, there are provided two separate generally U-shaped wire members 80 which are partially embedded with an elastomeric tube member 82 having a hollow lumen 84 extending longitudinally therethrough. Optionally, the portions of the wire members 80 which protrude out of the elastomeric tube member 82 may also be covered with elastomeric material 86. In this manner, the portions of the wire members 80 (with or without elastomeric covering 86) which protrude outwardly from the elastomeric tube member 82 may serve to abut against and engage the luminal surfaces of the passageways or blood vessels BV₁, BV₂, such that body fluid may pass through the lumen 84 of the tube member 82, from one passageway or blood vessel BV₁to the other passageway or blood vessel BV₂.

[0127] FIGS. 7d-7d′ shows another embodiment of a connector apparatus 10kwhich comprises a continuous segment of wire which is formed into a configuration having four generally U-shaped projections 92 extending laterally outward therefrom in opposite directions.

[0128] This apparatus 10kmay be utilized as a connector apparatus in and of itself, without any elastomeric covering, such that the U-shaped projection 92 may be placed in abutment with the luminal surfaces of the adjacent passageways or blood vessels BV₁, BV₂, thereby clipping or holding the openings formed in the passageways or blood vessels BV₁, BV₂in alignment with one another, and establishing the desired interconnection of the passageways or blood vessels BV₁, BV₂.

[0129] FIG. 7d′ shows an optional elastomeric tube member 94 having the central portion of the wire member formed therein such that the U-shaped projections 92 extend laterally outboard and away from the elastomeric tube member 94. In this manner, the elastomeric tube member is provided with a hollow lumen 96 extending longitudinally therefrom and, when the U-shaped projections are in abutment with the luminal surfaces of the passageways of blood vessels BV₁, BV₂, the elastomeric tube member 94 will form a discrete conduit or passageway whereby body fluid may pass through the lumen 96 of the tube member 94 from one passageway or blood vessel BV₁to the other passageway or blood vessel BV₂.

[0130] viii. Sinusoidal Wire Connector Apparatus

[0131] FIGS. 8-8ashow a connector apparatus 101 which is formed of a wire member 100 which has been formed or bent into multiple sinusoidal waves or convolutions, some of such sinusoidal waves or convolutions being of a first size 102 and others of such sinusoidal waves or convolutions being of a second size 104. Preferably the smaller sinusoidal waves or convolutions 102 are formed in pairs or couplets, with the larger sinusoidal waves or convolutions 104 being also formed in pairs or couplets which are positioned alternately with the pairs or couplets of the smaller sinusoidal waves or convolutions 102. In this manner, when the opposite ends of the wire member 100 are fused or coupled together by way of a sleeve member 101, the smaller sinusoidal waves or convolutions 102 will define a hollow passageway 106 and the larger sinusoidal waves or convolutions 104 may be bent laterally outward from the center of the passageway 106 so as to abut against and engage the respective luminal surfaces of the anatomical passageways or blood vessels BV₁, BV₂, as shown in FIG. 8a. In this manner, the sinusoidal wire connector apparatus 101 as shown in FIGS. 8, 8aserves to hold the first and second blood vessels BV₁, BV₂in connection with one another such that side wall openings formed in such first and second blood vessels BV₁and BV₂will be maintained in direct alignment with one another, thereby allowing body fluid to pass through the passageway 106 of the connector apparatus 101 from the lumen of one blood vessel BV₁to the lumen of the other blood vessel BV₂.

[0132] It will be appreciated that a covering formed of any suitable material (e.g., elastomeric, fabric, natural graft material, etc.) may be formed on all or part of the device. for example, a tubular covering may be mounted on the mid-portion formed by the smaller sinusoidal waves or convolutions 102 and the basal portions of the larger sinusoidal waves or convolutions 104, and such cover may optionally may extend outwardly over the entireties of the laterally bent portions of the larger sinusoidal waves or convolutions 104, in accordance with the invention as described hereabove in relation to FIGS. 7cand 7d′.

[0133] ix. Triplet Coil Type Connector Apparatus

[0134] FIG. 9 shows a triplet coil type connector apparatus 10mof the present invention comprising a first coil portion 114a, a second coil portion 114band a third coil portion 114c. The apparatus 10mis formed of a continuous wire member 110 which has been helically wound to form a coil wherein adjacent convolutions of the coil are in direct abutment with one another, or are closely spaced to one another.

[0135] The first coil segment 114ahas a first longitudinal axis LA₁. The coil segment 114bhas a second longitudinal axis LA₂which may be perpendicular to the first longitudinal axis LA₁of the first coil segment 114a. The third coil segment 114chas a third longitudinal axis LA₃which may be parallel to the first longitudinal axis LA₁of the first coil segment 114aand perpendicular to the second longitudinal axis LA₂of the first coil segment 114b.

[0136] The length 1 of the second coil segment 114bmay vary depending upon the desired distance between the first and second passageways or blood vessels BV₁, BV₂.

[0137] The wire member 110 may be formed of any suitable material such as stainless steel, superelastic nickel titanium alloy, etc. The apparatus 10mis preferably sufficiently pliable and resilient such that the three coil segments 114a, 114b, 114cmay be disposed in direct alignment with one another about a common longitudinal axis and radially compressed (and concurrently elongated) so as to be positionable within the lumen of a delivery catheter. For most intravascular applications, it will be desirable to compress the entire apparatus 10mto a compact configuration which may be mounted within or upon a delivery catheter of the type referred to in more detail herebelow. Thereafter, the delivery catheter may be advanced through the second blood vessel BV₂, through the opening formed between the second blood vessel BV₂and first blood vessel BV₁, and into the lumen of the first blood vessel BV₁. Thereafter, the third coil segment 114cwill be expelled out of the delivery catheter and allowed to assume its radially expanded, operative configuration as shown in FIG. 9.

[0138] Thereafter, the delivery catheter will be retracted to a position within or adjacent the opening between the first blood vessel BV₁and second blood vessel BV₂, and the second coil segment 114bwill be expelled or advanced out of the delivery catheter and allowed to radially expand to its expanded, operative configuration and attitude about the second longitudinal axis LA₂as shown in FIG. 9. Thereafter, the delivery catheter is further retracted into the lumen of the second blood vessel BV₂and the first coil segment 114ais expelled or advanced out of the delivery catheter and allowed to expand to its expanded, operative configuration as shown in FIG. 9.

[0139] In this manner, the first and third coil segments 114a, 114cwill seat against and frictionally engage the luminal surfaces of the first and second blood vessels BV₁and BV₂, respectively, and the second coil segment 114bwill traverse any space which exists between the first and second blood vessels BV₁and BV₂. It will be appreciated that a tubular covering or enclosure may be formed upon the inner and/or outer surfaces of any and/or all of the coil members 114a, 114b, 114cto provide a flow conduit which is impermeable to fluid, or to enhance the biocompatibility of the apparatus 10m.

[0140] x. Flanged Tube Type Connector Apparatus

[0141] FIGS. 10-10bshow a flanged tube type connector apparatus 10nof the present invention. It will be appreciated that, in addition to the specific flang configurations shown in the drawings, such flanges may be formed in many different configurations and designs and/or may include notches, geometries and configurational attributes designed to enhance the ability of the connector apparatus to withstand longitudinal contractions/expansions and rotational/orientation motions of the surrounding tissue.

[0142] The embodiment 10nshown in FIG. 10 comprises a segment of tubing which has been notched and formed such that semi-cylindrical or arcuate flanges 120 extend laterally outward from opposite sides of either end of a cylindrical or tubular mid-portion 122. When implanted between two blood vessels, as illustrated in FIG. 10, the semi-cylindrical or arcuate flanges will abut against the luminal surfaces of the blood vessels and will approximate the semi-cylindrical or arcuate shape of the adjacent luminal blood vessel surface. The tubular or cylindrical mid-portion 22 forms a discrete tubular conduit which extends between the opening formed in the adjacent blood vessels, thereby providing a substantially fluid tight conduit through which blood or other bodily fluid may pass.

[0143] FIGS. 10-10billustrate a preferred method of manufacturing this flanged tube type connector apparatus 10n. With reference to FIG. 10a, a segment of cylindrical tubing formed of resilient metal, resilient plastic, shape memory alloy or other suitable material is precut such that two (2) longitudinal notches 124 (e.g., rectangular notches) are formed in each end of the tube, at locations directly opposite one another, as shown. Thereafter, two transverse notches 126 (e.g., arcuate or wedge shaped notches) are formed on either side of the tube such that the center of each such transverse notch 126 is approximately 90° from the centers of the adjacent longitudinal notches 124 formed on that end of the tube. Thereafter, the protruding end portions of the notched tube are deformed or bent outwardly, as indicated by the arrows on FIG. 10a. This results in the formation of the connector apparatus 10nshown in FIG. 10 comprising the tubular mid-portion 122 having the arcuate or semi-cylindrical flanges 120 which extend laterally outward from each end of the tubular mid-portion 122.

[0144] xi. Cylindrical Connectors Having Ribbed Outer Surfaces

[0145] FIGS. 11a-11cshow three embodiments of externally ribbed cylindrical connectors 10o, 10p, 10qof the present invention.

[0146] The connector 10oshown in FIG. 11acomprises a cylindrical or tubular body 130 formed of a rolled sheet of resilient metal or plastic having overlapping ends 132 such that the rolled cylindrical body may be radially compressed to a radially compact diameter, and will subsequently resiliently return to a radially expanded diameter as shown in FIG. 11a. Cylindrical flanges or ribs 134 are formed about either end of the rolled tube 130, as shown. In this manner, the apparatus 10omay be held in its radially compact state within an introducer or catheter and delivered into a passageway formed between two anatomical structures, where it is allowed to radially expand to its operative configuration. Such radial expansion will cause the flange 134 at one end of the rolled cylindrical body 130 to abut against and engage the luminal surface of a first blood vessel or anatomical structure, surrounding a first opening formed in that blood vessel or anatomical structure. Similarly, the flange or rib 134bat the opposite end of the rolled tubular body 130 will abut against and engage the luminal surface surrounding an opening formed in a second blood vessel or other anatomical structure.

[0147] FIG. 11bshows another ribbed connector apparatus 10pwhich also comprises a rolled cylindrical body portion 136 formed and configured the same as that shown in FIG. 11a. In this apparatus 10p, a plurality of annular flanges or ribs 138 are formed about the outer surface of the rolled cylindrical body 136. When this apparatus 10pis delivered into a passageway between two blood vessels or other anatomical structures and allowed to expand, the flanges or ribs 138 on the outer surface of the rolled cylindrical body will embed into or engage interstitial tissue which surrounds the cylindrical body 136, thereby holding the apparatus 10pin its desired position between openings formed in adjacent blood vessels or anatomical structures. It will be appreciated that this embodiment of the apparatus 10pwill be particularly useful in applications wherein firm interstitial tissue surrounds the passageway which extends between the openings formed in the adjacent blood vessels or anatomical structures. Indeed, this apparatus 10pis devoid of any flanges or projections or surfaces which will abut against or engage the luminal surfaces of the adjacent blood vessels or anatomical structure, and relies instead on the engagement of the ribs or flanges 138 with the interstitial tissue to prevent the apparatus 10pfrom dislodging or longitudinally moving following implantation.

[0148] FIG. 11cshows another example of a ribbed cylindrical connector apparatus 10gcomprising a continuous cylindrical tubular body 140 having a helical rib or flange 142 formed about the outer surface thereof. The continuous cylindrical body 140 differs from the rolled cylindrical bodies of the embodiments 10o, 10pshown in FIGS. 11aand 11bin that it does not have overlapping ends and can not be radially compressed in a “roll-up” state. Rather, the cylindrical body 140 of this apparatus 10gis of a continuous cylindrical structure and is formed of resilient or collapsible material that will enable the apparatus 10gto be placed in a radially compact or reduced state for delivery into a passageway formed between openings and adjacent blood vessels or anatomical structures. After the tubular body 140 has been delivered and expanded to its operative configuration as shown in FIG. 11c, the helical outer rib or flange 142 will engage the interstitial tissue surrounding the passageway. As in the embodiment shown in FIG. 11b, this apparatus 10gwill be particularly useable in applications wherein the passageway formed between the blood vessels or other anatomical structures has firm surrounding interstitial tissue into which the helical rib or flange 142 may imbed.

[0149] xii. Possible Modifications of Embodiments to Accommodate Diagonal Passageways or Connections between Anatomical Structures Other than Blood Vessels

[0150] FIGS. 12 and 13 are intended to show modifications and alternative applications which may be applicable to all of the connector apparatus shown in FIGS. 1-11.

[0151] FIG. 12 is illustrative of the concept of forming the ends of each connector apparatus 10 such that the ends are non-perpendicular to the longitudinal axis LA of the apparatus 10. Such angle-cutting of the ends of the connector apparatus 10 will be applicable when the connector apparatus 10 is to be disposed within a diagonal or curved passway formed between openings which are not directly opposite one another on adjacent anatomical structures or blood vessels BV₁, BV₂. This aspect of the invention will be particular applicable in certain arterial bypass procedures, such as those described in U.S. patent application Ser. Nos. 08/730,327 and 08/730,496, when it is desired to form curved or diagonal blood flow passageways to minimize turbulence and to promote substantially laminar blood flow through the passageway and into the bypass vessel.

[0152] FIG. 13 shows a connector apparatus 10, which has the configuration of the specific apparatus 10kshown in FIG. 7d, disposed within a transmyocardial passageway formed between a coronary blood vessel CBV and the left ventricle LV of the heart. In this manner, FIG. 13 serves as an example of an application wherein any or all of the connector apparatus 10 of the present invention may be used to form a connection between anatomical structures other than two blood vessels (i.e., a coronary blood vessel and a chamber of the heart).

[0153] xiii. Possible Modification of Embodiments to Accommodate or Conform to Passageways of Differing Length

[0154] It will be appreciated by those skilled in the art that the length or distance between the first and second anatomical structures may vary considerably. Thus, for embodiments of the connector apparatus 10 which are of fixed length, it may be desirable to manufacture or provide such connector apparatus in a variety of lengths and sizes so as to allow the operator to select the appropriate length or size for use in the instant application. Alternatively, many if not all of the embodiments of the present invention may be constructed such that the connecting portion of the connector apparatus 10 is elastic, adjustable, telescoping, distendable, of according configuration, or otherwise adjustable to accommodate or conform to passageways of differing length.

[0155] xiv. Delivery and Implantation of the Connector Apparatus

[0156] It should be generally understood that the connector may be delivered via any number or possible delivery mechanisms including but not limited to:

[0157] 1. Delivery mechanisms which trap the connector initially within an inner tubular member and an outer tubular member wherein movement of the one member relative to the other allows the connector to be exposed and deployed at first partially to allow the first set of engagement members to come in contact with the first lumen and then deployed fully to allow the second set of engagement members to come into contact with the second lumen.

[0158] 2. Connectors which are mounted onto a balloon, covered or non-covered by a temporary sheath, and then deployed with the assistance or forcibly directed by the balloon to their engaging position.

[0159] 3. Connectors mounted between two balloons, initially covered or non-covered by a sheath, wherein the balloons act principally to bring the engagement members into contact with the apposing lumens; however, the two balloons may further act to dilate and further deploy the connector within the channel.

[0160] 4. Two piece connectors, such as the rivet device shown in FIG. 6, may be deployable via two members mounted over a central core capable of moving towards each other such that the resultant force acts to engage the inner aspect of the two rivet components, fixing them in apposition.

[0161] 5. Delivery mechanisms which hold the connector in a compressed state within a sheath and deploy the connector through the relative movement of an inner push-rod mechanism, allowing it to deploy in a first partially expanded state, and then to a fully expanded state.

[0162] 6. Delivery of connectors which may be rotationally inserted into the tissue, expanding it as it is advanced into position, and then disengaged, allowing the connector to remain anchored within the channel that was partially enhanced by the delivery mechanism.

[0163] 7. Delivery mechanisms which utilize some form of thermal, electrical, fluid or chemical means to induce a conformational change in the connector upon proper positioning in the channel.

[0164] Examples of suitable delivery catheters for implanting connector apparatus 10 of the present invention are shown in FIGS. 14a-14d.

[0165] FIG. 14ashows a withdrawable sheath type delivery catheter 100acomprising an elongate inner member 102 having a connector apparatus 10 of the present invention mounted thereon, and a surrounding retractable outer sheath 104. The connector apparatus 10 in this embodiment is preferably self-expanding or formed of shape memory material which will radially expand when warmed to body temperature. When the sheath 104 is fully advanced over the connector apparatus 10, the sheath will radially constrain and hold the connector apparatus 10 in the desired radially compact configuration. After the catheter 100ahas been advanced to the desired location, the sheath 104 may then be retracted (or alternatively the inner member 102 may be advanced) thereby removing the surrounding constraint from the connector apparatus 10 such that the connector apparatus 10 may radially expand and become implanted in the desired location.

[0166] FIG. 14bshows a balloon delivery catheter 100bcomprising a tubular catheter body 106 and an elongate member 108 having an inflatable balloon 110 formed thereon. The connector apparatus 10 is initially mounted on the deflated balloon 110 with the connector apparatus 10 in its radially compact configuration. After the catheter 100bhas been advanced to the desired implantation site, the catheter 106 is withdrawn (or the inner member 108 is advanced) and the balloon in inflated so as to radially expand the connector apparatus 10 and to cause the connector apparatus to become implanted at its desired implantation site.

[0167] FIG. 14cshows a push rod type delivery catheter 100ccomprising an outer tubular sheath 112 an advanceable push rod 114. The connector apparatus 10 is initially placed in the lumen of the catheter sheath 112, ahead of the distal end of the push rod 114, with the connector apparatus 10 in its radially compact configuration. After the catheter 100chas been advanced to the desired implantation site the catheter 112 may be retracted (or the push rod 114 may be advanced) to expel the connector apparatus 10 out of the distal end of the catheter. In this manner, the connector apparatus 10 is relieved of any surrounding constraint and is permitted to radially expand and become implanted in the desired implantation site. It will be appreciated that this embodiment is particularly suitable for self-expanding embodiments of the connector apparatus 10 or those formed of shape memory material which will expand upon warming to body temperature. A more detailed description of this push rod type of delivery catheter is set forth in parent application Ser. No. 08/730,327, filed on Oct. 11, 1996.

[0168] FIG. 14dshows a slider sheath type delivery 100d. This device comprises an inner member 120 upon which the connector apparatus 10 is mounted in its radially compact configuration. Proximal and distal sheaths 122a122bare initially drawn together such that the distal end of the proximal sheath member 122ais in abutment with the proximal end of the distal sheath member 122b, thereby covering and providing an enclosure or constraint about the radially collapsed connector apparatus 10. After the catheter 100bhas been advanced to the desired implantation site, one or both of the proximal and distal sheath member 122a, 122bis/are moved away from the other so as to expose the radially compact connector apparatus 10, as shown in FIG. 14b. In embodiments where the connector apparatus 10 is self-expanding or formed of shape memory material which will expand upon warming to body temperature, such opening of the slider sheaths 122a, 122bwill allow the connector apparatus 10 to expand and become implanted at its desired implantation site. In other embodiments wherein the connector apparatus 10 is formed of plastically deformable material, the radial expansion member such as an inflatable balloon will be mounted on the inner member 120 beneath the radially compact connector apparatus 10. Such radial expansion or balloon may then be radially expanded (e.g., inflated) to radially expand and plastically deform the connector apparatus 10, as desired.

[0169] FIG. 14eshows a rotatable delivery catheter 100ewhich comprises an elongate member 130 which is in itself rotatable, or which is provided with a rotatable distal portion. The connector apparatus 10 is mounted upon the distal portion of the elongate member 130, as shown. After the elongate member 130 has been advanced to a position adjacent the desired implantation site, the elongate member 130 or the distal portion thereof is rotated, and the elongate member 130 is further advanced so as to rotatably drive and advance the connector apparatus 10 into the desired implantation site. It will be appreciated that this embodiment is particularly useable for connector apparatus 10 which are not radially expandable, and or those having helical or spiral ribs on the outer surface thereof (e.g., FIG. 11c) and/or for those having a leading edge which is sharpened or otherwise adapted to cut tissue so as to bore and form or enlarge the passageway as the connector apparatus is advanced.

[0170] These additional connector delivery catheters shown in FIGS. 14a-14eare examples of the types of delivery catheter devices which may be utilized, in addition to the double balloon catheter shown in FIGS. 3′″, 4′″ and 5″, and described more fully hereabove.

[0171] xv. Connector Apparatus which Include Tissue Puncturing Connecting Portions Such that the Connecting Portions May Reside Outside of the Fluid Flow Passageway

[0172] FIGS. 15a-15a′ show a modified rivet type connector apparatus 10e′″, of the type previously described and claimed in U.S. patent application Ser. No. 08/730,327. This connector apparatus 10e′″ comprises first and second annular engagement members 600, 602, and a plurality of connecting members 604 which extend from first engagement member 600 and which are adapted to engage and connect to receiving aperture 606 formed in the second engagement member 602. As shown in FIGS. 9aand 9a′, the connector member 604 may be capable of penetrating through the tissue, and may be situated such that they will pass through the walls of the first and second blood vessels BV₁, BV₂and through any intervening interstitial tissue such that the connector members 604 will lay outside of the previously formed passageway or channel, and outside of the openings formed in the respective first and second blood vessels BV₁, BV₂.

[0173] These drawings illustrate that the connector portion of the connector apparatus 10 need not extend through or reside within the fluid flow passageway, but actually may protrude through intervening tissue and reside outboard of the passageway, as shown.

[0174] These delivery devices are generally capable of being advanced over a guide wire into the channel and may assist passively or actively in the proper deployment of the connector. Further it should be understood that various radiopaque or imageable markers may be placed in important locations on the delivery mechanism to permit proper placement or monitoring of placement during deployment. Further, it is also possible that various recapturing mechanisms such as thread(s), hood(s) or other capturing or securing means may be provided to allow for the reversible deployment of the connector in the instance where it was found to be improperly placed.

[0175] The invention has been described hereabove with reference to certain presently preferred embodiments only, and no effort has been made to exhaustively describe and show all possible embodiments in which the invention may take physical form. Indeed, numerous alterations, modifications and changes may be made to the above-described embodiments without departing from the spirit and scope of the invention. For example, specific elements or attributes of one embodiment may be incorporated into any or all of the other embodiments shown in the drawings, and may be interchanged or recombined in any possible combinations, and all such modifications and combinations of the elements and components of the invention described herein are intended to be within the scope of the following claims.