US 8,469,953 B2Grant
Twin sealing chamber hub
Issue Date:2013-06-25
•7 Claims
•4 Drawing Sheets
Abstract
Devices and methods for cooling microwave antennae and microwave hub construction are disclosed herein. The cooling system and hub can be utilized with a variety of microwave antenna types. A microwave hub is utilized to provide cooling fluids to a microwave antenna. The hub is constructed using no glue or adhesive for holding the different parts of the chambers in place. O-rings provide an increased reliability and consistency for fluid-tight seals in the hub. The various parts of the hub are form fitted and work together with the o-rings.
Metadata
Assignee
- Covidien LP
Inventor
- Arnold V. DeCarlo
Application Information
Application Number:US 12/619,323
Filing Date:2009-11-16
Priority Date:2009-11-16
Art Unit:3739
Classifications
IPC:
A61B18/18
Patent Drawings (4 sheets)
Description
Background
[0001] The present invention relates generally to the field of ablation. More particularly, the present invention relates to apparatus, systems, and methods for cooling electrosurgical probes or microwave antennas. More particularly, the present invention relates to methods of assembly of electro-surgery and microwave antennas.
[0002] During the course of surgical procedures, it is often necessary for medical personnel to utilize electrosurgical instruments to ablate tissue in a body. High frequency probes or antennas are often utilized to ablate tissue in a body. In use, the probes or antennas are connected to a high frequency power source to heat body tissue when inserted into the tissue. Among the drawbacks of such devices is the potential that the probes or antennas will overheat, thus causing damage to the bodily tissue or causing damage to the instrument. A cooling system may be used in conjunction with the instrument to provide cooling of the instrument and often to the tissue adjacent to the instrument so as to provide optimal thermal characteristics in the instrument and the tissue. In the event that the heat is not dissipated in the instrument, charring of the tissue or failure of the instrument can occur.
[0003] Surgical systems exist that provide cooling systems for the instrument. Existing systems provide a flow of a cooling fluid to the instrument thus cooling the instrument and potentially the tissue adjacent to or abutting the targeted tissue. These systems generally employ a mechanism whereby the cooling fluid flows into a hub through a chamber. The fluid flows into a lumen path and down to the tip of the instrument, providing cooling along the shaft of the instrument. The fluid returns to another chamber in the hub and exits through a fluid egress channel.
[0004] The chambers, lumen paths, hub and seals of a hub are constructed in a manner requiring an adhesive, or glue, to maintain their integrity during stress. It is known that during use, pressure is created in the interior of the hub causing stress at the seal locations, in the chambers and at the connection points. However, adhesives or glue can be inconsistent and unreliable. Not only can adhesives breakdown under stress or heat conditions, but the application of the adhesives during the manufacturing process can be inconsistent. These breakdowns and inconsistencies can lead to malfunctions and inadequate cooling.
Summary of the Invention
[0005] According to one embodiment of the present invention, there is provided an electrosurgical hub. The hub is adapted to provide cooling fluid to probes that extend from a distal end of the hub. The probes are utilized by medical personnel to ablate tissue in a body.
[0006] Two chambers and a dual path lumen provide cooling liquid to a probe. Cooling fluid enters into the hub and is channeled from a first chamber through a lumen path which transports the fluid to the probes for cooling purposes. An insert defines the boundary for the first chamber and causes the cooling fluid to spin, thus reducing the presence of air bubbles. The insert is adapted to accommodate a first o-ring to form a seal between the first chamber and a second chamber. A connector connected to the probes which conducts power to the probe, is also adapted to accommodate a second o-ring to form a seal on the back side of the first chamber.
[0007] The cooling fluid returns through a second lumen path and enters a second chamber. A plug is adapted to accommodate a third o-ring to form a second seal on the second chamber. The plug has an annular ring utilized to center the plug in the hub and maintain the third o-ring in position during high stress conditions.
[0008] In general, the apparatus of the present invention is directed to a twin sealing chamber ablation hub constructed without glues or adhesives. The system offers a method of construction that improves reliability in the chamber seals. The apparatus includes a geometry whereby air bubbles which can cause hot spots on the ablation probe are substantially removed from the cooling liquid.
[0009] There is accordingly a need for an electrosurgical hub that provides consistency in manufactured result as well as reliability under stress conditions. There is a need for a hub that overcomes the breakdown of adhesives. There is also a need for a hub that allows for consistent manufacturing procedures.
Brief Description of the Drawings
[0010] FIG. 1 is a view of an embodiment of the invention showing twin chambers in a hub with inserts providing separation of the chambers;
[0011] FIG. 2 is an alternate view of an embodiment of the invention showing twin chambers in a hub with inserts providing separation of the chambers; and
[0012] FIG. 3 is a view of an insert of an embodiment of the invention.
Detailed Description of the Embodiments
[0013] In one embodiment of the invention, a twin chamber microwave ablation hub comprises a plurality of inserts and o-rings causing seals between the chambers. A first chamber provides fluidic connection to an input port and a second chamber provides fluidic connection to an exit port. A dual path lumen provides fluidic connection from the first chamber to the second chamber. The first and second chambers are adapted to minimize the presence of air bubbles in a cooling fluid as the fluid travels through the input port and the first chamber, through a first path in the lumen to the distal end of an ablation probe. The cooling fluid returns via a second path in the lumen to the second chamber and exits the hub via the exit port. The first path and second path are concentric.
[0014] The term “probe” is not limited to the present embodiment or depiction. Naturally, the efficacy of the present invention may be optimized by different types of devices intended to facilitate energy focalization in a body, such as electrodes, antennas or other suitable device. The term “probe” is used to include any device, mechanism or structure capable of being inserted into a body and allowing an energy source to be focalized for ablation or other medical treatment.
[0015] FIG. 1 is a view of an embodiment of the invention showing a hub 10 and probe 20. Hub 10 comprises a first chamber 30, a second chamber 40, a first lumen path 50, a second lumen path 60, a first port 70 and a second port 72. First port 70 fluidicly couples to first chamber 30. First chamber 30 fluidicly couples to first lumen path 50. First lumen path 50 extends along a substantial portion of the probe 20. The second lumen path 60 extends around and along the first lumen path 50 and fluidicly couples with the second chamber 40.
[0016] The first 30 and second 40 chambers are defined by inserts inside the hub 10. A first insert 80 fits inside one end of hub 10. In one embodiment, the first chamber 30 is at one end by the first insert toward the handle end of the hub 10. The first insert 80 is positioned against stops 88. Stops 88 provide a positioning stop on the interior walls 90 of the hub for the first insert 80. The stops 88 provide a more precise positioning for the first insert 80 and eliminate placement guesswork. This allows for ease of insertion by providing a physical indicator of the proper insertion position.
[0017] The interior walls 90 of the hub 10 may be graduated so that they are of decreasing diameter from the handle end of the hub to the stops 88. This also allows for ease of insertion as well as precision in placement. In an embodiment of the invention, the graduation of the interior walls ceases prior to the stop 88, creating a zone where the interior wall 90 is flat. As discussed below, the flat zone in wall 90 allows for more reliable sealing of the first chamber 30.
[0018] An o-ring 82 is positioned in space 83 of the insert first 80. It is understood that the space 83 is a groove or other indentation in the first insert 80. When the first insert 80 in inserted into the hub 10 to the proper depth, the o-ring 82 will contact the flat portion of the interior wall. The o-ring 82 provides for continued sealing in the event of slight movement or slight inaccuracies in the manufacture of the first insert 80 or hub 10. The flat area allows for continued contact of the o-ring 82 in the event of slight movement. The o-ring 82 provides a water-tight seal for the first chamber 30. Accordingly, any cooling fluid will not flow around chamber 30 and past stops 88.
[0019] The second chamber 40 is positioned distally of the first chamber 30, toward the probe end of the hub 10. As noted above, the first insert 80 is inserted inside the hub 10 to stops 88. One end of the second chamber 40 is formed by the back side of the first insert 80. The second chamber 40 is completed by second insert 95 opposite the first insert 80. Insert 95 is inserted into the distal end of the hub 10 opposite the first insert 80. In one embodiment, the interior walls of the hub 10 at the distal end are graduated so that they are of decreasing diameter from the end of hub 10 to the interior. The graduation of the interior walls ceases at the location where the o-ring 84 reside. This creates a flat zone which allows continued sealing in the event of slight movement or slight inaccuracies in the manufacture of the insert 95 or hub 10. The graduation of the interior walls of hub 10 allow for ease of insertion of insert 95 as well as precision in placement.
[0020] The insert 95 comprises an end portion 96 adapted to provide a stopping mechanism. The end portion 96 acts to contact the end of hub 10. End portion 96 abuts the hub 10 and provides for precision in placement. An o-ring 84 is positioned in the second insert 95 to contact the interior wall 90 when the second insert 95 is inserted into the hub 10. The O-ring 84 is positioned in space 98 of the second insert 95. The o-ring 84 provides a water-tight seal for the second chamber 40. Accordingly, cooling fluid will not flow around chamber 40 or into the first chamber 30. The second insert 95 is molded to hub 10 on the opposite end of the hub 10 from handle 100. The molding maintains closure and sealing during high pressure conditions.
[0021] When the second insert 95 is inserted, a centered position in the hub is desired to help eliminate any leakage that may occur otherwise. An annular ring 120 is utilized to maintain a centered position of the second insert 95 and the o-ring 84 within the hub 10. When the second insert 95 in inserted so that the end portion 96 abuts the hub 10, the annular ring 120 contacts the interior wall 90 and disallows movement of the second insert 95.
[0022] A third o-ring 86 is positioned in handle 100. The third o-ring 86 provides a fluid seal on the back side of chamber 30. The handle 100 in inserted into the end of the hub 10 opposing the position of insert 95. In an embodiment, the handle 100 is molded to hub 10. The handle 100 is adapted to abut or closely abut first insert 80. The position of insert 80 is maintained by the handle 100 under high pressure conditions.
[0023] Handle 100 connects to the probe 20. Box 110 disallows improper insertion of the handle 100 and ensures that the probe 20 is connected properly through the hub 10. Box 110 protrudes away from the hub to disallow upside down insertion of the handle 100. The probe 20 protrudes through the first 30 and second 40 chambers and first 80 and second 95 inserts.
[0024] FIG. 2 is a perspective view of an embodiment of the invention showing hub 210 and probe 220 extending from within the handle 299 out through the distal end of the hub 210. The probe 220 connects within the handle 299 to a power source (not shown). Hub 210 comprises a first chamber 230, a second chamber 240, a first lumen path 250, a second lumen path 260 and a first 270 and second 272 port. In an embodiment, the first 270 and second 272 ports are angled in relation to the axis of the hub 210 so that they are not perpendicular to the axis. The angle of the ports 270, 272 forms an acute angle toward the proximal end of the hub 210. The handle 299 forms a seal at the proximal end of the hub 210.
[0025] A first insert 280 forms the first chamber 230 between the handle 299 and the first insert 280. A second insert 295 forms the second chamber 240 between the first insert 280 and the second insert 295. The first chamber 230 is sealed by an o-ring 282 on the distal end of the chamber 230 and an o-ring 286 on the proximal end of the chamber 230. The second chamber 240 is sealed by o-ring 282 and an o-ring 284 on the distal end of the second chamber 240. Each O-ring 282, 284, 286 resides in a groove, or other formation, formed to receive the o-ring in the first insert 280, the second insert 295 and the handle 299, respectively.
[0026] The first lumen path 250 forms a fluid passage allowing a cooling fluid to travel from the first chamber 230 along the probe 220 to the distal end of the probe 220. The cooling fluid provides a cooling action along the length and tip (not shown) of the probe 220. The second lumen path 260 provides a return passage for the cooling liquid and is fluidicly coupled to the second chamber 240. The cooling liquid returns concentrically and outside the first lumen path 250 and empties into the second chamber 240.
[0027] As noted above relating to FIGS. 1 and 2 , the first insert (80 in FIG. 1 and 280 in FIG. 2 ) defines a boundary for the first chamber (30 in FIG. 1 and 230 in FIG. 2 ) and causes the cooling fluid to spin and thus reduce the presence of air bubbles. FIG. 3 provides a detailed view of the first insert 280. As noted above, the first insert 280 creates the first chamber (230 FIG. 2 ). The first insert 280 creates the chamber by using a seal 310 in the hub (210 FIG. 2 ). In an embodiment, the seal 310 is an o-ring which fits in a grooved portion 320, or other formed recess, of the insert. The grooved portion 320 is adapted to accommodate the o-ring 310.
[0028] Cooling fluid flows into the first chamber and fills the space within the first insert 280. The geometry 325 on the insert 280 is concave and induces spin in the cooling fluid as it enters the first chamber. The vortex type action induced on the cooling fluid allows it to move around the probe as it moves down the first lumen path. The vortex action aids in the elimination of air bubbles which may cause overheating of the probe.
[0029] The first insert 280 comprises a plurality of legs 330. In one embodiment, four legs 330 provide support for the first insert 280. The legs 330 provide a mechanism to abut the handle (not shown in FIG. 3 ) when the hub (not shown in FIG. 3 ) is assembled. The legs 330 will push against the handle to force the insert 280 against the stops on the interior of the hub.
[0030] Referring again to FIG. 1 , regarding the operation of the invention. Cooling fluid flows into the first port 70 and fills the first chamber 30. In one embodiment, the first chamber 30 is sized so that it fills with fluid relatively rapidly. The first insert 80 is shaped so that the fluid entering the first chamber 30 spins in a circular manner. The spinning of the fluid causes any residual air bubbles to be removed from the probe 20 and the walls of the first chamber 30. Air bubbles are known in the art to cause over-heating of the probe 20 and lead to failure of the device. The o-ring 82 in the first insert 30 seals the chamber 30, thus not allowing fluid to enter the second chamber 40. It is understood by those skilled in the art that the first insert 30 provides sealing. The o-ring 82 provides an extra level of sealing to ensure integrity under pressure conditions.
[0031] The handle 100 has the O-ring 86 to create a seal on the back side of the first chamber 30. It is understood by those skilled in the art that the handle 100 provides a level of sealing. The o-ring 86 provides an extra level of sealing to ensure integrity under pressure conditions. The cooling fluid flows out of chamber 30 and through the first lumen path 50. The first lumen path 50 carries the cooling fluid to the proximal end of the probe 20 providing a cooling effect on the probe 20. The cooling fluid returns to the hub 10 via the second lumen path 60. The cooling fluid empties from the second lumen path 60 into the second chamber 40. The second chamber is sealed by the o-ring 82 on one end which is positioned in the first insert 80 and the o-ring 84 which is positioned in the second insert 95. It is understood by those skilled in the art that the second insert 95 provides a level of sealing. The o-ring 84 provides and extra level of sealing to ensure integrity under pressure conditions.
[0032] As the cooling fluid pressure increases in the hub 10, the pressure will cause a separating force on the components within the hub 10. This pressure will stress the position of the o-ring 82 in the first insert 80 and the o-ring 84 of the second insert 95. An external geometry (not shown) positioned on the outside of the handle 100 will hold the handle 100 in place and resist movement of the inserts 80, 95 and o-rings 82, 84.
[0033] Referring again to FIG. 2 , the microwave assembly is easily manufactured with the hub 210, the first insert 280, the second insert 295 and the handle 299. The first insert 280 is inserted into the hub 210 until it abuts the stops 288 which are formed on the inside of the hub 210. The o-ring 282 in the first insert provides a seal against the interior wall of hub 210. In an embodiment, the wall of the hub 210 is graduated so that the circumference lessens toward the middle of the hub 210. The graduation levels off and ceases as the wall nears the stop 288 to allow a location for the o-ring 282 to seal.
[0034] The interior lumen path 260 connects to the central hole 292 in the first insert 280. The lumen paths 250, 260 protrude through the end of the hub 210. The second insert 295 is inserted over the lumen paths 250, 260 and into the distal end of the hub 210. O-ring 284 fits in a groove around the second insert 295 and forms a seal against the interior wall of the hub 210. In one embodiment, the wall at the distal end of the hub 210 is also graduated so that the circumference lessens toward the middle of the hub 210. The graduation levels off and ceases at a predetermined location which coincides with the position of the o-ring 284. The second insert 295 is molded to the distal end of the hub 210 to provide stability during high pressure situations.
[0035] The handle 299 and the probes are inserted into the proximal end of the hub 210. The probe 220 passes through the central holes in the inserts 280, 295 and helps create and enforce the lumen paths 250, 260. In an embodiment, the handle 299 and probe 220 are pre-assembled to maintain a sound electrical connection. A lip portion 298 extends from the portion of the hub 210 opposite the ports 270, 272. The lip portion 298 allows the insertion of the handle 299 in only one way to assure proper insertion of the handle 299. Insertion of the handle 299 provides sufficient pressure on the first insert 280 to maintain the insert 280 in the proper position. The stop 288 on the interior of the hub 210 wall prevents the first insert from being inserted too far inside the hub 210. The handle 299 is then molded to the hub 210.
[0036] It is understood that the above described embodiments are only illustrative of the application of the principles of the present disclosure. Numerous modifications and alternative arrangements may be devised by those skilled in the art without departing from the spirit and scope of the present disclosure. The appended claims are intended to cover such modifications and arrangements.
Claims
What is claimed is:
1. A microwave assembly, comprising:
a hub, the hub comprising a proximal end, a distal end, an input port and an output port;
a first insert, the first insert having a center hole;
a second insert; the second insert having a center hole, and an end portion;
a first lumen path and a second lumen path concentrically oriented respective to each other and wherein the first lumen path is connected to the center hole of the first insert and the second lumen path is connected to the center hole of the second insert;
a handle, the handle functionally connected to a probe;
a first chamber defined by the first insert; and
a second chamber defined by the first insert and the second insert,
wherein the first insert is inserted into the proximal end of the hub, the proximal end of the hub being adapted to receive the first insert, the second insert is inserted into the distal end of the hub, the hub adapted to receive the second insert, the first lumen path and the second lumen path extend through the center hole of the second insert and through the distal end of the hub, and the handle is inserted into the proximal end of the hub in abutting engagement with the first insert.
2. The microwave assembly of claim 1, wherein the hub further comprises an interior surface, and further comprising:
a first o-ring adapted to fit around the first insert creates a seal against the interior surface;
a second o-ring adapted to fit around the handle creates a seal against the interior surface; and
a third o-ring adapted to fit around the second insert creates a seal against the interior surface.
3. The microwave assembly of claim 2, wherein the first chamber is between the first and second o-rings and the second chamber is between the first and third o-rings, wherein the first chamber is in fluid communication with the input port and the second chamber is in fluid communication with the output port.
4. The microwave assembly of claim 1, wherein the second insert is attached to the distal end of the hub.
5. The microwave assembly of claim 1, wherein the hub comprises a stop in the interior surface and the first insert abuts the stop.
6. The microwave assembly of claim 1, wherein the hub comprises a stop in the interior surface and the first insert abuts the stop, and the interior surface circumferentially decreases from the proximal end to a predetermined location toward a center point of the hub and ceases to decrease circumferentially before the stop; and wherein the interior surface circumferentially decreases from the distal end to a predetermined location toward the center point of the hub and ceases to decrease circumferentially.
7. The microwave assembly of claim 1, wherein the hub comprises a stop in the interior surface and the first insert abuts the stop, the interior surface circumferentially decreases from the proximal end to a predetermined location toward a center point of the hub and ceases to decrease circumferentially before the stop; and wherein the interior surface circumferentially decreases from the distal end to a predetermined location toward the center point of the hub and ceases to decrease circumferentially, and the hub further comprises an extension adapted to extend laterally away from the center of the hub and to engage the handle to disallow incorrect insertion of the handle into the proximal end of the hub.
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