Expandable surgical access port

[0001] This application claims priority from provisional application Ser. No. 61/420,358, filed Dec. 7, 2010, and is a continuation-in-part of application Ser. No. 13/166,878, filed Jun. 23, 2011, which claims priority from provisional application Ser. No. 61/372,939, filed Aug. 12, 2010, and is a continuation-in-part of application Ser. No. 13/166,875, filed Jun. 23, 2011, which claims priority from provisional application Ser. No. 61/372,960, filed Aug. 12, 2010. The entire contents of each of these applications are incorporated herein by reference.

[0002] 1. Technical Field

[0003] The present disclosure relates generally to devices and techniques for performing surgical procedures. More particularly, the present disclosure relates to an expandable access device for minimally invasive surgery.

[0004] 2. Background of the Related Art

[0005] In an effort to reduce trauma and recovery time, many surgical procedures are performed through small openings in the skin, such as an incision or a natural body orifice. For example, these procedures include laparoscopic procedures, which are generally performed within the confines of a patient's abdomen, and thoracic procedures, which are generally performed within a patient's chest cavity.

[0006] Specific surgical instruments have been developed for use during such minimally invasive surgical procedures. These surgical instruments typically include an elongated shaft with operative structure positioned at a distal end thereof, such as graspers, clip appliers, specimen retrieval bags, etc.

[0007] During minimally invasive procedures, the clinician creates an opening in the patient's body wall, oftentimes by using an obturator or trocar, and thereafter positions an access assembly within the opening. The access assembly includes a passageway extending therethrough to receive one or more of the above-mentioned surgical instruments for positioning within the internal work site, e.g. the body cavity.

[0008] During minimally invasive thoracic procedures, an access assembly is generally inserted into a space located between the patient's adjacent ribs that is known as the intercostal space, and then surgical instruments can be inserted into the internal work site, i.e. thoracic cavity, through the passageway in the access assembly.

[0009] In the interests of facilitating visualization, the introduction of certain surgical instruments, and/or the removal of tissue specimens during minimally invasive thoracic procedures, it may be desirable to spread the tissue adjacent the ribs defining the intercostal space. Additionally, during these procedures, firm, reliable placement of the access assembly is desirable to allow the access assembly to withstand forces that are applied during manipulation of the instrument(s) inserted therethrough. However, reducing patient trauma during the procedure, discomfort during recovery, and the overall recovery time remain issues of importance. Thus, there exists a need for a thoracic access port which minimizes post operative patient pain while enabling atraumatic retraction of tissue and which does not restrict access to the body cavity, as well as facilitates retrieval of tissue specimens from the body cavity and aids visualization of and through the incision.

[0010] In accordance with one aspect of the present disclosure, a surgical access assembly for positioning within an opening in tissue is provided comprising an outer frame positionable outside a patient and defining an opening therein dimensioned to receive a surgical instrument therethrough. The outer frame includes a first portion, a second portion and a locking portion. A region of the second portion overlies a region of the first portion and underlies a region of the locking portion, wherein the locking portion locks the first and second portions. An inner member is positionable within a patient. A flexible member extends between the inner member and outer frame, the flexible member spreadable by actuation of the outer frame.

[0011] In a preferred embodiment, the locking portion locks the first and second portions in a plurality of select spread positions to maintain the flexible member in a select spread position. In some embodiments, the second portion includes a first engagement structure and a second engagement structure spaced from the first engagement structure, and the first portion includes a third engagement structure and a fourth engagement structure, wherein the first engagement structure is engageable with the third engagement structure and the second engagement structure is engagable with the fourth engagement structure. In some embodiments, the locking portion is relatively movable with respect to the second portion from a first position wherein the first and second engagement structures are out of engagement with the third and fourth engagement structures to a second position in engagement with the third and fourth engagement structures.

[0012] In some embodiments, the locking portion has a camming surface to cam the first and second engagement structures into the second position.

[0013] In another aspect, the present disclosure provides a surgical access assembly for positioning within an opening in tissue comprising an outer frame positionable outside a patient and defining an opening therein dimensioned to receive a surgical instrument therethrough. The outer frame includes a first portion, a locking portion, and a second portion having a first engagement structure engagable with the first portion. The first and second portions are relatively movable in a direction away from each other to select spread positions, and the locking portion and the second portion are relatively movable to lock the first and second portions in select spread positions. An inner member is positionable within a patient and a flexible member extends between the inner member and outer frame and is spreadable by the relative movement of the first and second portions in the direction away from each other.

[0014] In some embodiments, the first portion has a first indentation for a user's finger(s) and the second portion has a second indentation for the user's finger(s). In some embodiments, the locking portion has a third indentation for a user's finger(s).

[0015] In some embodiments, the first and second engagement structures are on opposing sides of the second portion and are joined by a transverse member extending in a direction transverse to the direction of relative movement of the first and second portions. The first and second engagement structures can be engageable with third and fourth engagement structures on the first portion. The locking portion can have a camming surface to cam the engagement structure into engagement with the first portion.

[0016] The present disclosure provides in another aspect a surgical access assembly for positioning within an opening in tissue comprising an outer frame positionable outside a patient and defining an opening therein dimensioned to receive a surgical instrument therethrough. The outer frame includes a first portion, a locking portion and a second portion having an engagement portion, wherein the first and second portions are relatively movable to select spread positions to widen the passageway therethrough. An inner member is positionable within a patient. A flexible member extends between the inner member and outer frame, the flexible member spreadable by relative movement of the first and second portions to the select spread position. The locking portion is relatively slidable with respect to the second portion along an axis parallel to the direction of relative movement of the first and second portions and the engagement portion is movable in a direction transverse to the direction of relative movement of the locking portion and second portion to lock the first and second portions in select spread positions.

[0017] In some embodiments, the locking portion includes a camming surface to cam the engagement portion of the second portion toward the first portion to lock the first and second portions in the select spread position. The locking portion can be seated in an undercut in the second portion.

[0018] In some embodiments, the engagement portion of the second portion includes a first engagement structure and a second engagement structure spaced from the first engagement structure, the first and second engagement structures engageable with respective third and fourth engagement structures on the first portion. The second portion in some embodiments underlies a region of the locking portion and overlies a region of the first portion.

[0019] In some embodiments, a region of the first and second engagement structures extend from a transverse member extending transverse to the direction of relative movement of the first and second portions.

[0020] In some embodiments, the locking portion is relatively slidable with respect to the second portion to move the first and second engagement structures from a first position out of engagement with the third and fourth engagement structures to a second position in engagement with the third and fourth engagement structures.

[0021] In accordance with another aspect of the present disclosure, a surgical access assembly is provided for positioning within an opening in tissue. The surgical access assembly comprises an outer frame positionable outside a patient and defining an opening therein dimensioned to receive a surgical instrument therethrough, and including a first portion, a second portion and a locking portion. The first portion includes a first indentation to receive a finger of a user and the second portion includes a second indentation to receive a finger of a user. An inner member is positionable within a patient. A flexible member extends between the inner member and outer member and is spreadable by actuation of the outer frame.

[0022] The locking portion can include a third finger indentation for a user's finger. In some embodiments, the first finger indentation is open in a first direction, the second finger indentation is open in a second direction, and the third finger indentation is open in the first direction.

[0023] In some embodiments, the locking portion and second portion are movable together with respect to the first portion to spread the flexible member, and the locking portion and second portion are subsequently relatively movable to lock the first and second portions in a spread position.

[0024] In another aspect, the present disclosure provides a surgical access assembly for positioning within an opening in tissue comprising an outer member positionable outside a patient and defining an opening therein dimensioned to receive a surgical instrument therethrough. The outer member includes first and second portions, and at least the first portion is movable with respect to the second portion. An inner member is positionable within a patient and a flexible member extends between the inner member and outer member and is spreadable by actuation of the outer member. First and second tension bands extend along a portion of the flexible member that are stretchable upon spreading of the flexible member.

[0025] In some embodiments, first and second end supports support the tension bonds, and each of the first and second tension bands extends between the first support and the second support. The first and second supports can be attached to the outer member. In some embodiments, the first and second tension bands are composed of the same material as the flexible member; in other embodiments, the first and second tension bands are composed of a different material than the flexible member.

[0026] In some embodiments, the first and second tension bands are substantially parallel and have a longitudinal axis substantially parallel to a direction of relative movement of the first and second portions.

[0027] The inner member can include a raised portion extending toward the outer member and the flexible member can be attached at a distal end to the raised portion and attached at a proximal end to the outer member.

[0028] In another aspect, the present disclosure provides a surgical access assembly for positioning within an opening in tissue comprising an outer tensioning member having an opening dimensioned and configured to receive a surgical instrument therethrough. The outer tensioning member includes first and second portions. A flexible member extends distally with respect to the outer tensioning member, the flexible member being spread upon actuation of the outer tensioning member to retract tissue adjacent the opening in tissue. A locking mechanism is movable with respect to at least the first portion of the outer tensioning member to retain the outer tensioning member in a plurality of spread positions. The locking mechanism has first and second surfaces engageable with the second portion, the locking mechanism including a connecting structure extending transverse to a direction of actuation of the outer tensioning member and connecting the first and second surfaces.

[0029] Preferably, the locking mechanism is movable from a first position wherein first and second engagement portions of the second portion are out of engagement with the first portion and a second position wherein the first and second engagement portions are engaged with the first portion to retain the first and second portions in a select spread position. In some embodiments, the first and second engagement portions pivot toward the first portion to move the second position.

[0030] In some embodiments, the surfaces of the locking portion include camming surfaces to cam the first and second engagement portions into the second position into engagement with the first portion. In some embodiments, the first portion has a plurality of raised surfaces on an upper surface to receive the first and second engagement portions of the second portion.

[0031] In some embodiments, the first and second engagement portions in the second position overlie a region of the first portion and underlie a region of the locking portion.

[0032] The first and second portions and/or the connecting structure can include an indentation for a finger of a user.

[0033] In another aspect, the present disclosure provides a surgical access assembly for positioning within an opening in tissue comprising a first frame portion having an opening dimensioned and configured to receive a surgical instrument therethrough. The first frame portion has first and second arms and a first surface on the first arm and a second surface on the second arm, the opening positioned between the arms. A second frame portion has first and second locking structures, wherein the first locking structure is engageable with the first surface and the second locking structure is engageable with the second surface. A locking mechanism has first and second engagement surfaces connected such that the first and second locking structures substantially simultaneously lockingly interact with the respective first and second surfaces of the first frame portion. A flexible member extends distally with respect to the first frame, the flexible member being spreadable to retract tissue adjacent the opening in tissue, and the locking mechanism retaining the flexible member in a spread position.

[0034] In some embodiments, a second frame is positioned distally of the first and second frame portions and the flexible member extends proximally of the second frame.

[0035] In some embodiments, the first and second locking structures are movable from a first position out of engagement with the respective first and second surfaces and a second position in engagement with the first and second surfaces. In some embodiments, the first and second locking structures are biased to the first position, and the locking mechanism includes a camming surface to cam the first and second locking structures to the second position. In some embodiments, a sliding movement of the first frame portion spreads the flexible member. In some embodiments, the first and second surfaces include a plurality of projections extending proximally therefrom and the first and second locking structures include a plurality of projections extending distally from the first and second arms.

[0036] In some embodiments, the first and second engagement surfaces of the locking mechanism are joined by a transverse bridge member.

[0037] In another aspect, the present disclosure provides a surgical access assembly for positioning within an opening in tissue comprising an outer frame assembly positionable outside a patient and defining an opening therein dimensioned to receive a surgical instrument therethrough. The outer frame includes a first portion and a second portion movable with respect to the first portion. An inner member is positionable within a patient and includes a distally extending nerve protecting member. A flexible member extends between the inner member and outer frame and is spreadable by actuation of the outer frame. A cushioning member is positioned distally of the outer frame and is engageable with a patient's skin.

[0038] In some embodiments, the cushioning member is a foam material. In some embodiments, the distally extending nerve protecting member defines a non-circular opening.

[0039] A method of accessing an internal portion of a patient to enable insertion of surgical instrumentation therethrough is also disclosed.

[0056] Various embodiments of the presently disclosed access assembly, or access port, and methods of using the same, will now be described in detail with reference to the drawings wherein like references numerals identify similar or identical elements. In the drawings, and in the following description, the term “proximal” refers to the end of the access port, or component thereof, that is closer to the clinician and the term “distal” refers to the end that is further from the clinician, as is traditional and conventional in the art. It should also be understood that the term “minimally invasive procedure” is intended to include surgical procedures through small openings/incisions performed within a confined space such as the thoracic cavity.

[0057] Referring now to FIGS. 1 and 2, an embodiment of the presently disclosed surgical access port, generally identified by the reference numeral 100, is depicted as a thoracic port 100 that is configured and dimensioned for insertion into the intercostal space located between the adjacent ribs “R” (FIG. 8) of a patient in order to allow for the insertion and manipulation of one or more surgical instruments within the thoracic cavity. However, it is also envisioned that access port 100 may be configured and dimensioned to provide access to a variety of other internal body cavities and/or tissues. Access port 100 may be formed from any suitable biocompatible material of strength suitable for the purpose described herein, including, but not being limited to, polymeric materials.

[0058] The access port 100 is configured and dimensioned to extend into a body cavity, e.g., the thoracic cavity “T” (FIG. 8), through the intercostal space, and with reference to FIGS. 1 and 2, generally includes an outer or proximal frame 110 having first and second frame portions 112, 130 and a locking member or locking portion 114. A flexible member 170, e.g. membrane 170, is coupled to outer frame 110 and extends distally therefrom. The distal end 171 of the flexible member 170 is attached to an inner or distal frame 150. The outer frame 110 is movable between various spread positions to widen the passageway for insertion of instrumentation. More specifically, first and second portions 112 and 130 of frame 110 are relatively slidable to increase the distance between respective inner end walls 113, 115, and to increase the size of the opening 117 in the outer frame 110. The sliding of portions 112 and 130 applies tension to the flexible member 170 to retract tissue adjacent the incision in the patient to widen the access opening in the manner described below. It should be appreciated that although as described below both the first and second portions 112, 130 are slidable, it is also contemplated that only the first portion 112 (or lower portion as viewed in the orientation of FIG. 1) is slidable with respect to the second (upper) portion 130, or that only the second portion 130 (the upper portion as viewed in the orientation of FIG. 1) is slidable with respect to the first (lower) portion. Thus, the term relatively slidable includes one or both of the first and second portions 112, 130 moving relative to the other portion.

[0059] It should be understood that the use of the term first and second portions and locking portions or members contemplates an assembly of several components or a unitary assembly.

[0060] As shown, the frame 110 is substantially rectangular in shape with a substantially rectangular opening 117. As can be appreciated, other shaped frames and openings are also contemplated. Note also that preferably the shape is elongated, e.g. has a length greater than its width H (see FIG. 4), at least in its spread position, which better conforms to the shape of the incision to facilitate removal of tissue specimens through the access port 100. By way of example, the frame 110 can have a width of about 4.7 inches and a length which changes from about 4.3 inches to about 5.9 inches. Other dimensions are also contemplated.

[0061] Inner member or inner frame 150 has an elongated opening 155 therethrough for passage of surgical instrumentation. The inner member 150 also has a nerve protecting wall or lip 152 extending along the opening 155, and preferably substantially surrounding the opening, and extending upwardly toward outer frame 110. The lip facilitates attachment of the flexible membrane 170 thereto. The inner member 150 is preferably composed of a substantially rigid material to provide anchoring of the access port while of sufficient flexibility to be bent or reconfigured for insertion as described below and sufficiently flexible to fit the curvature of the ribs of the intercostal space. In one embodiment by way of example, the inner frame has a length L (FIG. 4) of about 2.3 inches and a width W (FIG. 2) of about 5.1 inches, although other dimensions are also contemplated. The opening 155 is preferably non-circular in configuration, e.g. oval like in configuration. Other configurations are also contemplated. In the illustrated embodiment, the inner frame 150 is positioned transverse to the direction of movement of the outer frame 110. Consequently, the longer dimension of the opening 155 in inner frame 150 is transverse to the longer dimension of the passageway 117 of the outer frame 110. Stated another way, the outer frame 110, at least in its expanded position, has a length exceeding its width, the inner frame 150 has a width exceeding its length, and the lengthwise dimension of the outer frame 110 is aligned with the lengthwise dimension of the inner frame 150.

[0062] Inner member 150 includes tabs 153 extending distally from a bottom surface (see FIG. 3). The tabs 153 facilitate removal by providing a gripping surface for a surgical tool for removal of the inner member 150 at the end of the surgical procedure. They also facilitate grasping by the surgeon if desirable. The tabs can include a flared distal end and/or texture to facilitate grasping.

[0063] In the alternate embodiment of FIG. 2B, the inner frame 250 has a lip 252 surrounding opening 255 and having a plurality of proximally extending tabs 254 to increase the attachment area, e.g. weld area, for the flexible member 170. As shown, two tabs 254 are positioned on each end of the opening to increase the attachment area at the corners. In all other respects, inner frame 250 is identical to inner frame 150 of FIG. 2.

[0064] Flexible member 170 is generally funnel shaped and is coupled at its distal end 171 (see FIG. 3) to lip 152 of inner member 150 and extends proximally therefrom. Proximal end 172 of flexible member 170 can be coupled to end walls 113, 115 (or their lower surfaces) of outer frame 110 or alternatively to end supports 176, 178 discussed below, to isolate tissue surrounding access port 100 from the passageway 174 extending therethrough, thus reducing the risk of tissue damage and/or infection during the surgical procedure. The flexible member 170 can be attached by various methods such as welding, gluing, and thermal bonding. It is envisioned that flexible member 170 is configured for soft tissue retraction. It is also envisioned that flexible member 170 be of sufficient elasticity to permit retraction of a wide range of tissue thicknesses since there may be a wide range of tissue thicknesses among different patients. It is also envisioned that flexible member 170 is of sufficient strength to prevent accidental tearing and/or puncture by surgical instrumentation inserted through access port 100. Additionally, it is envisioned that flexible membrane 170 be made from a bio-compatible material to reduce the incidents of adverse reaction by a patient upon contact with the patient's tissue. Flexible member 170 can be in the form of a flexible membrane. Flexible member 170 may also be made of a transparent material to allow the surgeon to better visualize the surgical site and surrounding tissue. Flexible member can be composed of polyurethane, although other materials such as silicone are also contemplated. It can be composed of a single member, a single member folded over and the edges attached forming a single seam, or alternatively two or more members attached together. For example, a two panel design with two seams or a four panel design with four seams, two on each side, can be utilized, with the flexible panels welded along the seam.

[0065] Flexible member 170, in the embodiment shown in FIG. 2, can be supported by a base 175. Base 175 includes end supports 176, 178, preferably composed of a polymeric material, and elongated membrane tensioning bands 177, 179, shown in substantially parallel relationship and extending between end supports 176, 178. The tensioning bands 177, 179 can be composed of the same material as the flexible member 170, or alternatively of a different material. The flexible member 170 can be formed with two seams so a tension band can be threaded through the seam in manufacture and welded to the membrane. When the flexible member 170 is spread by outer frame 110, the bands 177, 179 likewise stretch. Bands 177, 179, facilitate stretching of member 170 and the return of member 170 to its non-spread position when the frame 110 is moved to the un-expanded position. Bands 177, 179 also aid the sliding of the frame and insertion of the inner member 150. End support 176 is connected to the undersurface of frame portion 114 and end support 178 is connected to the undersurface of portion 130 by swaging or by other methods such as snap fit or ultrasonic staking, thereby connecting flexible member 170 to the outer frame 110.

[0066] The frame supports 176 and 178 each have a pair of tabs 176a, 176b which function as a stop for frame portion 114 and 130. That is, as shown in FIG. 11, movement of frame portion 112 away from frame portion 130 is limited by tabs 176a due to the abutment with wall 113a. Movement of frame portion 130 away from frame portion 112 is limited by tabs 176b abutting a wall of frame portion 130. These tabs prevent disassembly of the outer frame.

[0067] The outer frame 110 of access port 100 is preferably sufficiently rigid to retain flexible member 170 in a tensioned configuration. As frame 110 is expanded (spread), flexible member 170 is tensioned and stretched radially outwardly to retract tissue and/or to expand the passageway 174 extending through member 170. The outer frame 110 can be flexible in the plane of the patient's body surface to allow it to conform to the shape of the patient's body, presenting a lower profile to surgeons.

[0068] More specifically, with reference to FIGS. 1, 2, 4, frame portion or member 112 of outer frame 110 has a transverse end wall 121 with arms 127, 128 extending therefrom, preferably at substantially right angles thereto, although other angles are contemplated. Arms 127, 128 transition into arm sections 123, 125. The arms 123, 125 and 127, 128 are preferably integral with end wall 121, however, in alternative embodiments, they can be separate components attached to the opposing end regions of wall 121. As shown, arm sections 123, 125 have a reduced profile in relation to arms 127, 128. That is, the height or thickness of arm section 123 is less than the height or thickness of arm section 127. Similarly, the height or thickness of arm section 125 is less than the height or thickness of arm section 128. Arm sections 123, 125 can have a smaller width than arms 123, 125. The arm sections 123, 125 are shown as extending substantially parallel to one another with a substantially planar upper surface 140, 146, respectively. The upper surface 140 of arm section 123 has a plurality of projections 141 forming an engagement structure. Similarly, the upper surface 146 of arm section 125 has a plurality of projections 147 forming an engagement structure. The projections in the illustrated embodiment include a plurality of discs (or spheres) arranged in a plurality of rows. Other arrays and a different number of projections are also contemplated. Projecting surfaces other than spheres (domes) are also contemplated to achieve the engaging/locking function described below. The projections 141 and 147 of arm sections 123, 125 form an engagement structure to receive the engagement structure of the frame portion 130 as described in detail below.

[0069] Locking portion or member 114 of outer frame 110 has an end wall 116 and arms 118 and 119 extending therefrom. The arms can be integrally formed with end wall 116, or alternatively, composed of separate components connected to opposing ends of the wall 116. End 118a of arm 118 and end 119a of arm 119 angle upward (proximally) to form angled camming walls described below. The arms 118, 119 are preferably substantially perpendicular to the end wall 116, although they can be positioned at other angles. The locking portion 114 has a lip 111 (FIG. 2C) for securement of the locking portion 130. Locking portion 114 has a lip 118c (FIG. 5) which acts as a stop (as it contacts side wall 139b of tab 135) to prevent disassembly of the locking portion 114. A similar lip on the other side of the locking portion 114 similarly interacts with a sidewall of tab 137.

[0070] Frame portion 112 includes a finger indentation 121a formed in wall 121 which is dimensioned and configured to receive a user's finger(s). Finger indentation 121a includes edge 121b and open end 121c. Similarly, locking portion 114 includes a finger indentation 116a formed in wall 116 which is dimensioned and configured to receive a user's finger(s). Finger indentation 116a includes an edge 116b and an open end 116c. Edges 121b and 116b form an abutment for the user's finger(s) to facilitate sliding movement of the portion 112 and portion 114 as described below. Directional arrows can be provided within the indentations 121, 116 to direct movement of these components as described below. Also, locking/unlocking graphics can be provided in the outer frame 110. Note the edges 121b and 116b are oriented in the same direction.

[0071] Frame portion or member 130 of outer frame 110 includes wall 132 with arms 134, 136, extending therefrom, either integrally or formed of separate components attached thereto. Arms 134, 136 can be positioned substantially perpendicular to the wall 132, or alternatively positioned at different angles. The wall 132 extends transversely with respect to arms 134, 136, and transverse to the direction of movement of the frame portions 112, 130, thus forming a transverse bridge for connection of the two locking arms 134, 136. The frame portion 130 is interposed between the first portion 112 and the locking portion 114 such that a section of the frame portion 130 overlies arm sections 123, 125 of first portion 112 and the arms 118, 119 of locking portion 114 overlie arms 134, 136 of frame portion 130 as shown in FIG. 1. Arms 136 and 138 include a lip on a lower surface to receive frame portion 112 (see e.g. lip 136a of FIG. 6).

[0072] Arm 134 of frame portion 130 includes a locking tab 135 and arm 136 includes a locking tab 137. The locking tabs 135, 137 form pivoting locking arms for locking engagement with the first portion 112. That is, the first pivoting locking arm or tab 135 is positioned on a first side of the frame portion 130. The tab 135 can be formed integrally with the frame portion 130, e.g. similar to an integral tab formed for example by a cutout. Alternatively, the tab 135 can be a separate element attached to the frame portion 130. A second pivoting locking arm or tab 137 preferably identical to locking tab 135 is provided on the opposing side of frame portion 130 and functions in the same manner as locking tab 135, and can be integral with or a separate component of frame portion 130.

[0073] More specifically, the undersurface or distal surface of the locking tabs 135, 137 each includes engagement structure for engaging the engagement structure on the arms 123, 125 of frame portion 112. The locking tabs 135, 137 are preferably biased upwardly (proximally) so that in their normal position their engagement structure is out of engagement, or at least out of locking engagement, with the engagement structures on the respective arm sections 123, 125 as shown in the cross-sectional view of FIG. 5. The ends 118a and 119a of locking portion 114 have a ramped surface 118b to force the locking tabs 135, 137 downwardly toward arm sections 123, 125 to engage the engagement structures of the arm sections 123, 125 to lock the frame portions 112, 130 in a spread position as shown in the cross-sectional view of FIG. 11.

[0074] That is, the locking mechanism for frame 110 maintains frame portions 112, 130 in a select spread position by engagement of a first engagement structure on one arm 134 and a second engagement structure on the other arm 136 of frame portion 130. The locking member or locking portion 114 is selectively relatively slidable with respect to the second frame portion 130 in a direction along a longitudinal axis of the outer frame 110 to move the engagement structures on arms 134 and 136, e.g. locking tabs 135 and 137, in a direction transverse to the longitudinal axis of the outer frame 110 into locking engagement with the projections 141, 147 on arms 123, 125 of frame portion 112. In this manner, the first and second portions 112, 130 of the outer frame 110 are moved apart to a desired spread position to expand and stretch the flexible member 170 and then retained or locked in the select position by relative movement of the locking member 114 with respect to the second portion 130 which substantially simultaneously causes tabs 135, 137 to lockingly engage both arms 123, 125 of frame portion 112 due to their connection by transverse bridge 132 and due to the connection of ends 118a and 119a of locking portion 114 by wall 129 also forming a transverse bridge. Note the term relatively slidable includes one or both of the locking portion 114 and frame portion 130 moving relative to the other portion.

[0075] The undersurface of tab 135 includes a plurality of projecting surfaces 133. In a preferred embodiment, the projecting surfaces 133 are disc like members, e.g. domes or spheres, similar in configuration to projections 141, 147. In the illustrated embodiment they are arranged in three rows, two across, however other arrays and a different number of projections are also contemplated, as well as other configurations, e.g. domes or spheres (balls). Similarly, the undersurface of tab 137 includes a plurality of projecting surfaces 131. In a preferred embodiment, the projecting surfaces 131 are also dome or sphere (ball) like members. In the illustrated embodiment, they are arranged in three rows, two across, however other arrays are also contemplated. Projecting surfaces 131 are preferably configured and arranged in the same manner as projecting surfaces 133.

[0076] The pivoting tabs 135, 137 are preferably biased to a position away from the second portion 112 so in its normal position their respective projections 133, 131 do not engage (or at least do not lockingly engage) the projections 141, 147 of frame portion 112. That is, as shown in FIG. 5, the tabs 135, 137 are spring biased upwardly to a first non-engaged position. Tab 135 has an upper surface 139, for engagement by the angled camming surface 118b of end 118 of the locking portion 114, described below. Tab 137 likewise has an upper surface, for engagement by the angled camming surface of the end 119 of locking portion 114. Consequently, when the frame portion 130 and second portion 114 are relatively moved with respect to each other (either one moving toward the other or both moving toward each other), camming surface 118b of end 118 engages the upper surface 139 of tab 135, thereby forcing the tab 135 downwardly as viewed in FIG. 11 so that projecting surfaces 133 engage the projections 141 of arm section 123. The projecting surfaces 133 are dimensioned to fit within and move between the spaces 142 of the select projections 141. Likewise, when the locking portion 114 and second portion 130 are relatively moved with respect to each other (either one moving toward the other or both moving toward each other), the camming surface of end 119a of arm 119 engages the upper surface of tab 137, thereby forcing the tab 137 downwardly so that the projecting surfaces 131 engage the projections 147 of arm section 125. The projecting surfaces 131 move between the spaces of the select projections 147. This engagement of projections 141, 147 restricts movement of the first and second portions 112, 130. Thus, in use, once the desired spread position of the first portion 112 and second portion 130 is achieved to tension flexible member (e.g. membrane) 170 and retract tissue, locking member 114 and/or second portion 130, are slid toward each other to pivot arms (tabs) 135, 137 into engagement with the projecting surfaces 141, 147 on arm sections 123, 125 of frame portion 112, thereby clamping (securing) outer frame 110 in the select spread position.

[0077] Second portion 130 can include a finger indentation 130a with an end wall 130b and an open end 130c. The finger indentation 130a is oriented in an opposite direction of finger indentation 116a of locking portion 114 such that walls 116b, 130b face each other. This facilitates movement of the locking member 114 and/or the second portion 130 toward each other. Note in preferred embodiments, locking portion 114 moves toward frame portion 114 and 112 to perform its camming and locking function so as not to affect the tension on flexible member 170 during locking.

[0078] In the alternate embodiment of FIG. 2A, cushioning pads are provided to reduce irritation to the patient's skin. The access port 300 of FIG. 2A is identical to the access port 100 of FIG. 2, except for the cushioning pads. Therefore, for convenience, the identical parts of access port 300 have been labeled with reference numerals identical to those of FIG. 2 except they have been changed to the “300 series.” Consequently, access port 300 has for example an outer frame 310, with first portion 312, second portion 330, and locking portion 314. Access port 300 also includes flexible member 370 secured at a proximal end to outer frame 310 and at a distal end to inner frame 350. Inner frame 350 has a lip 352, surrounding an opening 155, which together with passage 374 in member 370 and opening 317 in outer frame 310 enable passage of surgical instrumentation into the body cavity. Not all the corresponding parts between access port 300 and access port 100 have been labeled for clarity, and for brevity further discussion of identical components to access port 100 is not provided.

[0079] Turning now to the different feature of access port 300, the port 300 includes a first cushioning pad 390 and a second cushioning pad 392. The pads 390, 392 can be composed of material such as polyurethane foam, although other materials are also contemplated. An upper surface 390a of pad 390 is attached to an undersurface of portion 330 of outer frame 310 by thermal bonding. An upper surface 392a of pad 392 is attached to an undersurface of portion 312 of outer frame 310 by similar methods. The pads 390, 392 can be arcuate shaped to conform to the respective undersurface of portions 312, 330. In the embodiments where the flexible member is supported by a base 375 similar to base 175 of FIGS. 1 and 2, the pads 390, 392 can be attached by thermal bonding to the undersurface of the end supports 376 (which are similar to end supports 176). In use of the port 300, when the port 300 is placed on the patient's skin, the pads 390, 392 contact the patient's skin rather than the frame portions 312, 330 or base 175.

[0080] The use of the access port will now be described in conjunction with the embodiment of FIG. 1, it being understood that the access port 300 of the embodiment of FIG. 2A would work in a similar fashion. The use of the access port will be described for thoracic surgery, it being understood that it can also be utilized in other surgical procedures to provide access to an internal region, e.g. an internal cavity, of the patient to enable insertion of surgical instrumentation therethrough.

[0081] Initially, an opening, or incision, is made in the patient's outer tissue wall of the thoracic body cavity by conventional means. The incision is made between adjacent ribs “R” (FIG. 8), extending along the intercostal space, and is relatively narrow and elongated.

[0082] For insertion through the incision, the inner member 150 is bent or reconfigured to reduce its transverse dimension for insertion through the patient's incision and into the body cavity. Note different sizes of access ports can also be used to accommodate different patients and/or incision lengths.

[0083] With inner (distal) member 150 inserted and then released, the access port 100 is in position such that the inner member 150 is positioned within the body cavity adjacent the inner portion of the incision, flexible member 170 extends through the incision to outside the patient's body, and upper (outer) frame 110 rests on the patient's skin. The outer frame 110 can now be expanded to tension and stretch the flexible member 170 due to the attachment of the flexible member 170 to the outer frame 110 to retract tissue adjacent the ribs R and to widen the passageway 174 through the flexible member 170. Note in this placement position, in the illustrated embodiment, the longitudinal axis of the frame 150 is substantially parallel to a long axis of the incision and the longitudinal axis of outer frame 110 is substantially transverse to the long axis of the incision, the longitudinal axis defining the longer dimension of the respective frame. Stated another way, the longer width dimension W of inner frame 150 and the shorter width dimension H of outer frame 110 are substantially parallel to a long axis of the incision.

[0084] In the initial position of access port 100 as shown in FIG. 8, flexible member 170 defines a funnel shape with frame 110 retaining proximal end 172 of flexible member 170 while distal end 171 of flexible member 170 defines a smaller diameter due to the engagement of distal end 171 with the smaller dimensioned lip 152 of inner frame 150. In this initial position, lip 152 is configured to seat a rib “R” of a patient therein to protect the rib “R,” the intercostal nerve, and surrounding tissue. That is, lip 152 extends upwardly into the opening in tissue adjacent the ribs “R” (see FIG. 3). Additional cushioning (not shown) may be provided on lip 152 and/or an upper surface of frame 150 to provide further protection to ribs “R” and to surrounding tissue. Outward flexion of flexible member 170 expands the intercostal space, thus maximizing passageway 174 and giving access port 100 the maximum length. If the access port 300 is utilized, the cushioning material 390, 392 is in contact with the patient's skin to provide a less abrasive surface.

[0085] To spread the first and second sections 112 and 130 of frame 110 to stretch (radially tension) the flexible member 170 to retract tissue adjacent the ribs and incision and widen the incision passageway for passage of surgical instrumentation, the user can place his/her finger(s) of one hand in indentation 121a of portion 112 of outer frame 110 and place his/her finger(s) of the other hand in indentation 130a of portion 130. The frame portions 112 and 130 are then moved away from each other in the direction of the arrows on first portion 112 and second portion 130 (FIG. 9). Note the fingers of the user can abut the walls 121b, 130. Note that due to the connection of locking portion 114 and second portion 130 of outer frame 110, when second portion 114 is moved in the direction of the arrow, locking portion 114 is also moved together with the second portion 130 in that direction.

[0086] Note, as an alternative to utilizing the finger indentations, the user can otherwise grasp wall 121 of the first portion 112 and wall 132 of second portion 130 or wall 116 of locking portion 114 and spread them away from each other to expand the distance between end walls 113 and 115 to tension the flexible member 170.

[0087] Note the tissue is spread by actuation of the outer frame 110 transverse to the long axis of the incision. When the desired spread position, i.e. desired tissue retraction, is achieved, the user is now ready to lock (secure) the outer frame 110 in its selected spread position. To achieve this, the user can place one or more of his/her finger(s) of one hand in the indentation 130a of second portion 130 and one or more of his/her finger(s) in the indentation 116a of locking portion 114 and then squeeze them together in the direction of the arrows in indentation 116a and the direction of the arrow adjacent indentation 130a. Note the user's finger(s) can abut the respective walls 130b and 116b of indentations 130a, 116a, respectively. Such squeezing causes relative movement of second portion 130 and locking member 114, e.g. moves locking portion 114 in a direction toward first portion 112, to the position of FIG. 10. This movement causes the camming surface 118b of end 118a to engage the upper surface 139 of locking tab 135 to cam the locking tab 135 from the unlocked or unengaged position of FIG. 5 to the locking or engaged position of FIG. 11. Likewise, such movement causes the camming surface of end 119a to engage the upper surface of locking tab 137 to cam the locking tab 137 from the unlocked or unengaged position to the locking or engaged position. That is, prior to such movement, the projecting surfaces 133, 131 of locking tabs 135 and 137 are out of engagement, or at least out of locking engagement, with the projecting surfaces 141, 148 of arm sections 123, 125 of frame portion 112. Upon such movement, the projecting surfaces 133, 131 of locking tabs 135 and 137 are cammed into engagement with the projections 141, 147 of arm sections 123, 125, so the projecting surfaces 133, 131 are interposed between the spaces between projecting surfaces 141, 147 to limit slippage. This maintains the frame portions 112, 130 in a select spread (expanded) position, i.e. locks (or clamps) them against further movement during insertion of surgical instruments through access port 100.

[0088] With access port 100 secured in the desired expanded position, surgical instrumentation may be inserted through opening 117, passageway 174, and opening 155 to perform the surgical procedure within the body cavity. The low-profile configuration of access port 100, along the external surface of tissue, allows for greater access to the thoracic cavity “T” and for greater manipulation of instrumentation disposed through passageway 174.

[0089] Upon completion of the surgical procedure, second portion 130 and/or locking member 114 is relatively moved in the opposite direction (away from each other) toward their original position to release the camming surfaces from the upper surface of pivoting tabs 135, 137 to allow them to move to their unlocked non-engaged position, thereby allowing the frame portions 112, 130 to be moved toward each other toward their initial non-expanded (non-spread) position to untension flexible member 170. Next, the surgeon may grasp inner member 150 e.g., with a surgical tool, to fold or reconfigure it to reduce its transverse dimension to remove it from the thoracic cavity and through the incision.

[0090] As will be appreciated, access port 100 is easily inserted, manipulated, and removed from a patient's body. Further, the access port 100 is minimally intrusive, flexible to conform to a patient's anatomy, and provides good visibility into the thoracic cavity “T” (FIG. 3). Additionally, the low-profile configuration of access port 100 is particularly advantageous, for example, in the removal, or retrieval, of tissue specimens from within the body.

[0091] The flexible member 170 may be coated with a lubricant, or gel, to aid in the insertion and removal of surgical instrumentation and/or tissue specimens from access port 100.

[0092] Although described for use in thoracic procedures, it should also be understood that the access ports described herein can be used in other minimally invasive surgical procedures.

[0093] Persons skilled in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying figures are non-limiting exemplary embodiments, and that the description, disclosure, and figures should be construed merely exemplary of particular embodiments. It is to be understood, therefore, that the present disclosure is not limited to the precise embodiments described, and that various other changes and modifications may be effected by one skilled in the art without departing from the scope or spirit of the disclosure. Additionally, it is envisioned that the elements and features illustrated or described in connection with one exemplary embodiment may be combined with the elements and features of another without departing from the scope of the present disclosure, and that such modifications and variations are also intended to be included within the scope of the present disclosure. Accordingly, the subject matter of the present disclosure is not to be limited by what has been particularly shown and described, except as indicated by the appended claims.