Sealed trocar assembly for a stapling device

Abstract

A stapling device includes a handle assembly and an adapter assembly extending from the handle assembly and including a sealed trocar assembly. The trocar assembly includes a trocar housing defining an internal cavity, a ring seal having an inner annular surface defining an internal opening, and a trocar disposed within the internal cavity of the trocar housing, through the internal opening of the ring seal, and movable through the internal cavity of the trocar and the internal opening of the ring seal, and a seal retainer operably coupled to the trocar housing and the ring seal. The trocar includes an elongate body portion having a distal end, and a trocar member extending distally from the distal end of the elongate body portion.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims the benefit of and priority to U.S. Provisional Patent Application Serial No. 62 / 978,339, filed February 19, 2020, the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates generally to surgical stapling devices, and more particularly to surgical stapling devices containing a seal configuration and components for surgical stapling devices. BACKGROUND

[0004] Powered surgical stapling devices contain a handle assembly, an adapter assembly containing a distal portion supported on the handle assembly, and a tool assembly (e.g., a cartridge shell) supported on the distal portion of the adapter assembly. Some tool assemblies contain a housing or reload assembly having a cartridge shell, a staple pusher, and an annular knife. The cartridge shell supports one or more annular rows of staples, and the staple pusher is movable within the cartridge shell to eject the staples from the cartridge shell. The annular knife is positioned radially inward of the annular staple rows and is movable from a retracted position to an advanced position to cut or core tissue. The annular knife can be moved simultaneously with the staple pusher or independently of the staple pusher to cut tissue during a surgical procedure (e.g., a stapling procedure).

[0005] In some applications, some components of the stapling device are disposable, while other components are reusable after proper sterilization. It is more difficult and time consuming to properly sterilize reusable components if contaminants flow into the adapter assembly. SUMMARY

[0006] The present disclosure relates to a trocar assembly for a surgical stapling device containing a seal configuration that prevents fluid from entering therein and an adapter assembly for a surgical stapling device.

[0007] According to aspects of the present disclosure, a stapling device includes a handle assembly and an adapter assembly extending from the handle assembly. The adapter assembly includes a trocar assembly disposed within the adapter assembly. The trocar assembly includes a trocar housing including an inner surface defining an inner cavity, a ring seal positioned within the inner cavity of the trocar housing and having an inner annular surface defining an inner opening, and a trocar disposed within the inner cavity of the trocar housing, extending through the inner opening of the ring seal, and movable through the inner cavity of the trocar and the inner opening of the ring seal, and a seal retainer operably coupled to the trocar housing. The seal retainer is positioned to retain the ring seal within the inner cavity of the trocar housing. The trocar includes an elongate body portion having a distal end and a trocar member extending distally from the distal end of the elongate body portion.

[0008] In one aspect, the inner annular surface of the ring seal frictionally engages to the elongate body portion of the trocar to form a fluid-tight seal between the ring seal and the trocar.

[0009] In one aspect, the seal retainer is fixedly coupled to the trocar housing.

[0010] In one aspect, the trocar housing has a distal end and the seal retainer has a proximal end, and the proximal end of the seal retainer is fixed to the distal end of the trocar housing.

[0011] In one aspect, the seal retainer includes a proximal lip and a distal lip and defines an inner annular region between the proximal lip and the distal lip.

[0012] In one aspect, the ring seal is disposed within the inner annular region of the seal retainer.

[0013] In one aspect, the ring seal includes an outer surface having a proximal lip and a distal lip extending radially outwardly from the outer surface of the ring seal.

[0014] In one aspect, the proximal lip and the distal lip of the ring seal are disposed within the inner annular region of the seal retainer to prevent axial movement of the ring seal as the trocar moves through the inner opening of the ring seal.

[0015] In one aspect, the ring seal includes a recessed region defined between the proximal lip of the ring seal and the distal lip of the ring seal. The proximal lip of the ring seal can be disposed within the inner annular region of the seal retainer and the distal lip of the seal retainer can be disposed within the recessed region of the ring seal to prevent axial movement of the ring seal as the trocar moves through the inner opening of the ring seal.

[0016] In one aspect, the elongated body portion has an outer surface that defines a non-circular shape, and the inner opening of the annular seal is sized to correspond in shape to the non-circular shape of the outer surface of the elongated body portion.

[0017] In one aspect, the annular seal is formed of an elastomeric material configured to compress when the trocar needle is positioned through the inner opening of the annular seal.

[0018] According to aspects of the present disclosure, a trocar assembly is provided that includes a trocar housing including an inner surface defining an inner cavity, an annular seal positioned within the inner cavity of the trocar housing and having an inner annular surface defining an inner opening, and a trocar disposed within the inner cavity of the trocar housing, extending through the inner opening of the annular seal, and movable through the inner cavity of the trocar and the inner opening of the annular seal, and a seal retainer operably coupled to the trocar housing. The seal retainer is positioned to retain the annular seal within the inner cavity of the trocar housing. The trocar includes an elongated body portion having a distal end, and a trocar member extending distally from the distal end of the elongated body portion.

[0019] In one aspect, the inner annular surface of the annular seal frictionally engages to the elongated body portion of the trocar to form a fluid-tight seal between the annular seal and the trocar.

[0020] In one aspect, the seal retainer is fixedly coupled to the trocar housing.

[0021] In one aspect, the trocar housing has a distal end, and the seal retainer has a proximal end, and the proximal end of the seal retainer is fixed to the distal end of the trocar housing.

[0022] In one aspect, the seal retainer includes a proximal lip and a distal lip, and defines an inner annular region between the proximal lip and the distal lip.

[0023] In one aspect, the annular seal is disposed within the inner annular region of the seal retainer.

[0024] In one aspect, the annular seal includes an outer surface having a proximal lip and a distal lip extending radially outwardly from the outer surface of the annular seal.

[0025] In one aspect, the proximal lip and the distal lip of the annular seal are disposed within the inner annular region of the seal retainer to prevent axial movement of the annular seal when the trocar moves through the inner opening of the annular seal.

[0026] In one aspect, the annular seal includes a recessed region defined between a proximal lip of the annular seal and a distal lip of the annular seal. The proximal lip of the annular seal can seat within the inner annular region of the seal retainer, and the distal lip of the seal retainer can seat within the recessed region of the annular seal to prevent axial movement of the annular seal when the trocar moves through the inner opening of the annular seal.

[0027] In one aspect, the elongate body portion has an outer surface defining a non-circular shape, and the inner opening of the annular seal is sized to correspond in shape to the non-circular shape of the outer surface of the elongate body portion.

[0028] In one aspect, the annular seal is formed of an elastomeric material configured to compress when the trocar is positioned through the inner opening of the annular seal.

[0029] The details of one or more aspects of the disclosure are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the technologies described in this disclosure will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0030] Various aspects of the disclosure are described below with reference to the drawings. In the following description, specific details are set forth to provide an understanding of the present disclosure. However, it will be apparent to one skilled in the art that the present disclosure can be practiced without some or all of these specific details.

[0031] Figure 1 is a perspective view of a circular stapling device including aspects of the present disclosure;

[0032] Figure 2 is Figure 1 a perspective view of an adapter assembly of the circular stapling device of

[0033] Figure 3 is a side view of a trocar assembly that can be used with the adapter assembly of Figure 2

[0034] Figure 4 is a partial exploded view of the trocar assembly of Figure 3

[0035] Figure 5 is a magnified view of the indicated area of detail of the annular seal of the trocar assembly shown in Figure 4 Figure 3 is a side cross-sectional view of a distal portion of the adapter assembly of taken along section line 6-6 of

[0036] Figure 6 Figure 2 is a partial exploded view of the trocar assembly of

[0037] Figure 7 is a partial exploded view of the trocar assembly of Figure 6 Figure 3 ​​​​​an enlarged view of the indicated detail area of the ring seal and seal retainer of the trocar assembly of

[0038] Figure 8 is another trocar assembly of other aspects of the disclosure that can be used with Figure 2 is a perspective view of another trocar assembly of other aspects of the disclosure that can be used with the adapter assembly of

[0039] Figure 9 is Figure 8 is a perspective view of the ring seal of the trocar assembly of

[0040] Figure 10 is a side cross-sectional view of the trocar assembly of Figure 8

[0041] Figure 11 is an enlarged view of the indicated detail area of the ring seal and seal retainer of the trocar assembly of Figure 8 Figure 10 DETAILED DESCRIPTION

[0042] In this specification, the term "proximal" is used generically to refer to portions of the device closer to the clinician, while the term "distal" is used generically to refer to portions of the device farther from the clinician. In addition, the term "clinician" is generally used to refer to medical personnel, including doctors, nurses, and support staff.

[0043] Aspects of the disclosed trocar assemblies and stapling devices that utilize the disclosed trocar assemblies provide one or more seals that prevent fluid from entering into the components of the trocar assemblies and stapling devices. The powered circular stapling device adapter is a reusable device designed to be cleaned and reused over several procedures. Because tissue, fluid, contaminants, and other biological matter can enter the device through the distal opening in the adapter assembly, particularly around the trocar assembly, it is necessary to clean the interior of the adapter assembly and its components prior to reuse. To assist with the cleaning, the trocar of the adapter is removed prior to cleaning to allow greater access to the interior of the adapter. Properly removing and reattaching the trocar can present challenges to the clinician and have an adverse effect on the reliability of the stapling device.

[0044] The present disclosure describes a powered or non-powered circular stapling device (or other applicable medical device) that incorporates a seal in the trocar assembly to prevent fluid from entering into the components of the device and the device that includes the adapter assembly. One or more seals can be incorporated to form a barrier to prevent bodily contaminants from entering into the interior of the device.

[0045] ​​​According to the present disclosure, the trocar assembly can be secured to the adapter assembly while the adapter assembly is being cleaned, thereby reducing the burden, cost, and potential for error for the clinician to assemble and remove the device. By placing one or more seals in the trocar assembly, the adapter assembly can be less complex and still allow the device to be cleaned in the event that any small amount of contamination passes through the seals.

[0046] Figure 1 A circular stapling device 10 is illustrated that includes a handle assembly 12, an elongated body or adapter assembly 100, a reload assembly 16 that is releasably supported on the adapter assembly 100, and an anvil assembly 25 that is releasably supported for movement relative to the reload assembly 16 between an open position and a clamped position.

[0047] The reload assembly 16 includes a proximal portion 16a that is releasably coupled to a distal portion 100b of the adapter assembly 100, and the adapter assembly 100 includes a proximal portion 100a that is releasably coupled to the handle assembly 12. The handle assembly 12 includes a fixed grip 22 that supports actuation buttons 27 for controlling operation of various functions of the circular stapling device 10, including accessing the reload assembly 16 and the anvil assembly 25, firing staples from the reload assembly 16, and cutting or coring tissue.

[0048] The circular stapling device 10 is illustrated as a powered stapling device that includes a powered handle assembly 12 that can support one or more batteries (not shown). The adapter assembly 100 transmits power from the handle assembly 12 to the reload assembly 16 and the anvil assembly 25, respectively, to staple and cut tissue. It is envisioned that the disclosed aspects can also be incorporated into a stapling device that is configured for use with a robotic system that does not include a handle assembly, or into a stapling device that includes a manually actuated handle assembly.

[0049] In certain aspects of the present disclosure, the reload assembly 16 of the circular stapling device 10 is designed to be disposable, and the handle assembly 12 and the adapter assembly 100 are designed to be reprocessed or resterilized and reused. Accordingly, the reload assembly 16 and the components that form the reload assembly 16 are formed from a less expensive and less durable material (e.g., plastic) than the material used to form the handle assembly 12 and / or the adapter assembly 100 (e.g., stainless steel). Additionally, preventing contaminants from entering the reusable components of the circular stapling device 10, such as the handle assembly 12 and the adapter assembly 100, simplifies the sterilization process for these reusable components. In aspects of the present disclosure, the adapter assembly 100, and in particular the trocar assembly 20 of the adapter assembly 100, includes a seal (e.g., Figure 5 the annular seal 300 of FIGS. 1-3, orFigure 9 annular seal 500) to prevent contaminants from entering into and around the trocar assembly 20 and the adapter assembly 100.

[0050] Figure 2 A trocar assembly 20 is illustrated that is received within a distal portion 100b of the adapter assembly 100 and is configured to operably engage an anvil assembly 25 Figure 1 ). In aspects, the trocar assembly 20 is fixedly coupled to the adapter assembly 100 and cannot be removed from the adapter assembly. Alternatively, the trocar assembly 20 can be removably coupled to the adapter assembly 100. A first aspect of the trocar assembly 20 is described as a trocar assembly 120 Figures 3 to 7 ) and a second aspect of the trocar assembly 20 is described as a trocar assembly 420 Figures 8 to 11 ). Throughout the specification, the trocar assembly 120 and the trocar assembly 420 are collectively referred to as the trocar assembly 20.

[0051] Figures 3 to 7 A trocar assembly 120 of the adapter assembly 100 Figure 2 ) is illustrated that includes a trocar housing 122, a trocar 123, a drive screw 126, an annular seal 300, and a seal retainer 350. The trocar 123 includes a trocar member 124, an elongate body portion 125, and a nut 129 having a threaded inner surface. The elongate body portion 125 extends distally from the nut 129. The trocar member 124 extends distally from the elongate body portion 125 and defines a tapered tip configured to pierce tissue. The trocar 123 extending through the annular seal 300 is movably disposed within the trocar housing 122 and is movable relative to the trocar housing 122 via rotation of the drive screw 126. The trocar housing 122 defines a first retention element 123a and a second retention element 123b for coupling the trocar housing 122 to the adapter assembly 100 Figure 2 ) and preventing rotation of the trocar housing 122 within the adapter assembly 100 when the drive screw 126 is rotated.

[0052] The drive screw 126 is operably received within a hollow portion of the elongated body portion 125 of the trocar 123 and is threadably engaged with an inner threaded surface of the nut 129 of the trocar 123 for axial movement of the trocar 123 relative to the trocar housing 122. In particular, rotation of the drive screw 126 effects axial movement of the nut 129 and the elongated body portion 125, and in turn, axial movement of the trocar member 124 disposed at the distal end of the elongated body portion 125 along the longitudinal axis relative to the trocar housing 122. The elongated body portion 125 can be rotatably fixed to the nut 129 to form a single unitary component such that rotation of the nut 129 effects rotation of the elongated body portion 125 in addition to axial movement of the elongated body portion 125.

[0053] The annular seal 300 has an inner annular surface 302 that defines an inner opening 305 and is retained to the trocar housing 122 by a seal retainer 350. The inner opening 305 of the annular seal 300 is sized and dimensioned to correspond to the shape and size of the elongated body portion 125 of the trocar 123. When the trocar 123 is positioned through the inner opening 305 of the annular seal 300, the inner annular surface 302 of the annular seal 300 frictionally engages to the elongated body portion 125 of the trocar 123 to form a fluid-tight seal between the annular seal 300 and the trocar 123 (e.g., the outer surface of the trocar 123). The seal retainer 350 is fixedly coupled to the trocar housing 122, for example, at the distal end 122b of the trocar housing 122 and defines an inner annular region 352 that receives the annular seal 300 (as described below). The seal retainer 350 can be coupled to the trocar housing 122 as a separate component via welding, press-fit engagement, threaded coupling, or can be machined into the distal end 122b of the trocar housing 122 as a single unitary component.

[0054] Figure 6 and Figure 7 A fluid-tight seal is formed between the annular seal 300 and the outer surface of the elongated body portion 125 of the trocar 123 is illustrated. Such fluid-tight seal formed by the annular seal 300 prevents contaminants from entering the components of the trocar assembly 120, and in turn, other portions of the adapter assembly 100. The seal retainer 350 includes a proximal lip 351a and a distal lip 351b that define an inner annular region 352 therebetween. The annular seal 300 is partially or fully disposed within the inner annular region 352 of the seal retainer 350 to prevent axial movement of the annular seal 300 when the trocar 123 is moved through the inner opening 305 of the annular seal 300.

[0055] In one aspect, the annular seal 300 Figure 5 ) includes a proximal lip 301a and a distal lip 301b that extend radially outward from an outer surface of the annular seal 300 and radially inward from an inner annular surface 302 of the annular seal 300. The proximal lip 301a and the distal lip 301b of the annular seal 300 provide a more effective seal between the annular seal 300 and the trocar 123 and between the annular seal 300 and the seal retainer 350.

[0056] The annular seal 300 can be formed of an elastomeric material, such as rubber or other compressible or flexible material. The inner opening 305 of the annular seal 300 is sized such that when the trocar 123 is positioned through the inner opening 305, the trocar 123 forces the annular seal 300 to compress outward against the seal retainer 350 against which the annular seal 300 rests. Thus, in one aspect, when the annular seal 300 is in a relaxed (e.g., non-deflected or non-compressed) state, the diameter of the inner opening 305 of the annular seal 300 is equal to or less than the outer diameter of the elongated body portion 125 of the trocar 123.

[0057] Figures 8 to 11 An alternative aspect of the disclosed trocar assembly 20 is illustrated, shown generally as trocar assembly 420, which includes a trocar housing 422, a trocar 423, a drive screw 426, an annular seal 500, and a seal retainer 550. The trocar 423 includes a trocar member 424 and an elongated body portion 425. The trocar member 424 extends distally from the elongated body portion 425 and defines a tapered tip configured to pierce tissue. The elongated body portion 425 includes a threaded portion 425t defined along an inner surface thereof. The trocar 123 extending through the annular seal 500 is movably disposed within the trocar housing 422 and is movable relative to the trocar housing 422 via rotation of the drive screw 426. The trocar housing 422 defines a retaining element 423a for coupling the trocar housing 422 to the adapter assembly 100 Figure 2 ) and prevents rotation of the trocar housing 422 within the adapter assembly 100 when the drive screw 126 is rotated.

[0058] The drive screw 426 is operably received within a hollow portion of the elongated body portion 425 of the trocar 423 and is threadedly engaged with a threaded portion 425t of the elongated body portion 425 of the trocar 423 for axial movement of the trocar 423 relative to the trocar housing 422. In particular, rotation of the drive screw 426 effects axial movement of the elongated body portion 425 and, in turn, axial movement of the trocar member 424 disposed at the distal end of the elongated body portion 425 along the longitudinal axis relative to the trocar housing 422.

[0059] The annular seal 500 has an inner annular surface 502 that defines an inner opening 505 and is retained to the trocar housing 422 by a seal retainer 550. The inner opening 505 of the annular seal 500 is sized and dimensioned to correspond to the shape and size of the elongated body portion 425 of the trocar 423. When the trocar 423 is positioned through the inner opening 505 of the annular seal 500, the inner annular surface 502 of the annular seal 500 frictionally engages to the elongated body portion 425 of the trocar 423 to form a fluid-tight seal between the annular seal 500 and the trocar 423 (e.g., the outer surface of the trocar 423). The seal retainer 550 is fixedly coupled to the trocar housing 422, for example, at the distal end 422b of the trocar housing 422 and defines an inner annular region 552 that receives a portion of the annular seal 500 (as described below). The seal retainer 550 can be coupled to the trocar housing 422 as a separate component via welding, press-fit engagement, threaded coupling, or can be machined into the distal end 422b of the trocar housing 422 as a single integral component.

[0060] Figure 10 and Figure 11A fluid-tight seal is created between the annular seal 500 and the outer surface of the elongated body portion 425 of the trocar 423. Such fluid-tight seal created by the annular seal 500 prevents contaminants from entering the components of the trocar assembly 420, and in turn, other portions of the adapter assembly 100. The seal retainer 550 includes a proximal lip 551a and a distal lip 551b that define an inner annular region 552 therebetween. A portion of the annular seal 500 is disposed within the inner annular region 552 of the seal retainer 550 to prevent axial movement of the annular seal 500 when the trocar 423 is moved through the inner opening 505 of the annular seal 500. In particular, the annular seal 500 includes a proximal lip 501a and a distal lip 501b that extend radially outward from the outer surface of the annular seal 500 that define a recessed region 507 therebetween. The proximal lip 501a of the annular seal 500 is disposed within the inner annular region 552 of the seal retainer 550 and the distal lip 551b of the seal retainer 550 is disposed within the recessed region 507 of the annular seal 500 to secure the annular seal 500 to the seal retainer 550 and provide a more effective seal between the annular seal 500 and the seal retainer 550 and prevent axial movement of the annular seal 500 when the trocar 423 is moved through the inner opening 505 of the annular seal 500.

[0061] Similar to the annular seal 300 (described above), the annular seal 500 can be formed of an elastomeric material, such as rubber or other compressible or flexible material. The inner opening 505 of the annular seal 500 is sized such that when the trocar 423 is positioned through the inner opening 505, the trocar 423 forces the annular seal 500 to compress outward against the seal retainer 550, against which the annular seal 500 rests. Thus, in one aspect, the diameter of the inner opening 505 of the annular seal 500 is equal to or less than the outer diameter of the elongated body portion 425 of the trocar 423 when the annular seal 500 is in a relaxed (e.g., non-deflected or non-compressed) state.

[0062] It will be understood by those within the art that the devices and methods specifically described herein and illustrated in the drawings are non-limiting exemplary embodiments. It will be appreciated that those skilled in the art, on the basis of the teaching herein, can make modifications without departing from the scope of the disclosure. Accordingly, the disclosure is not limited to the specific embodiments described and illustrated herein, but is intended to cover all possible embodiments falling within the scope of the disclosure.

Claims

1. A fastening device, comprising: Handle assembly; An adapter assembly extending from the shank assembly and including a cannula assembly comprising: A cannula housing having an inner surface defining an inner lumen; An annular seal is positioned within the inner cavity of the cannula housing, the annular seal having an inner annular surface defining an inner opening; A cannula, disposed within the inner cavity of the cannula housing, extending through the inner opening of the annular seal, and movable through the inner cavity of the cannula housing and the inner opening of the annular seal, the cannula comprising an elongated body portion and a cannula member, the elongated body portion having a distal end, the cannula member extending distally from the distal end of the elongated body portion; as well as A seal retainer, operably coupled to the cannula housing, is positioned to retain the annular seal within the cavity of the cannula housing. The seal retainer includes a proximal lip and a distal lip, and defines an inner annular region between the proximal lip and the distal lip. The annular seal is completely positioned within the inner annular region of the seal retainer to prevent axial movement of the annular seal when the cannula moves through the inner opening of the annular seal. The annular seal includes an outer surface, the outer surface including a proximal lip and a distal lip, the proximal lip and the distal lip of the outer surface of the annular seal extending radially outward from the outer surface of the annular seal and extending radially inward from the inner annular surface of the annular seal.

2. The fastening device according to claim 1, wherein the inner annular surface of the annular seal is frictionally engaged with the elongated body portion of the cannula to form a fluid-impermeable seal between the annular seal and the cannula.

3. The fastening device according to claim 1, wherein the seal retainer is fixedly coupled to the cannula housing.

4. The fastening device of claim 3, wherein the cannula housing has a distal end and the seal retainer has a proximal end, the proximal end of the seal retainer being fixed to the distal end of the cannula housing.

5. The fastening device of claim 1, wherein the annular seal includes a recessed region defined between the proximal lip of the annular seal and the distal lip of the annular seal, the proximal lip of the annular seal being disposed within the inner annular region of the seal retainer and the distal lip of the seal retainer being disposed within the recessed region of the annular seal.

6. A cannula assembly comprising: A cannula housing having an inner surface defining an inner lumen; An annular seal is positioned within the inner cavity of the cannula housing, the annular seal having an inner annular surface defining an inner opening; A cannula, disposed within the inner cavity of the cannula housing, extending through the inner opening of the annular seal, and movable through the inner cavity of the cannula housing and the inner opening of the annular seal, the cannula comprising an elongated body portion and a cannula member, the elongated body portion having a distal end, the cannula member extending distally from the distal end of the elongated body portion; as well as A seal retainer, operably coupled to the cannula housing, is positioned to retain the annular seal within the cavity of the cannula housing. The seal retainer includes a proximal lip and a distal lip, and defines an inner annular region between the proximal lip and the distal lip. The annular seal is completely positioned within the inner annular region of the seal retainer to prevent axial movement of the annular seal when the cannula moves through the inner opening of the annular seal. The annular seal includes an outer surface, the outer surface including a proximal lip and a distal lip, the proximal lip and the distal lip of the outer surface of the annular seal extending radially outward from the outer surface of the annular seal and extending radially inward from the inner annular surface of the annular seal.

7. The cannula assembly of claim 6, wherein the inner annular surface of the annular seal is frictionally engaged with the elongated body portion of the cannula to form a fluid-impermeable seal between the annular seal and the cannula.

8. The cannula assembly of claim 6, wherein the seal retainer is fixedly coupled to the cannula housing.

9. The cannula assembly of claim 8, wherein the cannula housing has a distal end and the seal retainer has a proximal end, the proximal end of the seal retainer being secured to the distal end of the cannula housing.

10. The cannula assembly of claim 6, wherein the annular seal includes a recessed region defined between a proximal lip and a distal lip of the annular seal, the proximal lip of the annular seal being disposed within the inner annular region of the seal retainer and the distal lip of the seal retainer being disposed within the recessed region of the annular seal.

11. The cannula assembly of claim 6, wherein the elongated body portion has an outer surface defining a non-circular shape, and the inner opening of the annular seal is sized to correspond in shape to the non-circular shape of the outer surface of the elongated body portion.

12. The cannula assembly of claim 6, wherein the annular seal is formed of an elastomeric material configured to compress when the cannula is positioned through the inner opening of the annular seal.

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