# Patent

## Title
Buttress assembly for use with surgical stapling device

## Abstract

An apparatus for joining two hollow organ sections includes a staple cartridge component, an anvil component, a knife member, a buttress mount and a buttress member. The staple cartridge component includes a plurality of surgical staples in an annular array. The anvil component is movable relative to the staple cartridge component between spaced apart and approximated positions to adjustably clamp tissue. The knife member is movable relative to the staple cartridge component. The buttress mount is concentrically disposed at least partially within the lumen of the knife member. The buttress mount includes a plurality of spokes radially extending outward and a plurality of legs detachably secured with an inner wall of the knife member. The buttress member is secured with the plurality of spokes of the buttress mount. The buttress member is concentrically aligned with the plurality of surgical staples.

## Background
BACKGROUND
1. Technical Field
The present disclosure relates to a surgical instrument for applying surgical fasteners or staples to body tissue, and more particularly, to a surgical buttress for use with an end-to-end anastomosis stapling apparatus.
2. Background of Related Art
Anastomosis is a surgical joining of separate hollow organ sections. Typically, an anastomosis procedure follows surgery in which a diseased or defective section of hollow tissue is removed and the remaining end sections are joined. Depending on the desired anastomosis procedure, the end sections may be joined by either circular, end-to-end or side-to-side organ reconstruction methods.
In a circular anastomosis procedure, the two ends of the organ sections are joined by means of a stapling instrument which drives a circular array of staples through the end section of each organ section and simultaneously cores any tissue interior of the driven circular array of staples to free the tubular passage. Typically, these instruments include an elongated shaft having a handle portion at a proximal end to actuate the instrument and a staple holding component disposed at a distal end. An anvil assembly including an anvil shaft with attached anvil head is mounted to the distal end adjacent the staple holding component. Opposed end sections of the organ to be stapled are clamped between the anvil head and the staple holding component. The clamped tissue is stapled by driving a plurality of staples from the staple holding component so that the ends of the staples pass through the tissue and are deformed by the anvil head.
In use, one end section of the organ is secured about the anvil assembly and the other end section of the organ is held in place adjacent the staple holding component. The shaft of the anvil assembly is removably connected to the instrument. Once the anvil shaft is secured to the instrument, the anvil is drawn into close approximation to the staple holding component. The instrument is then fired to cause the staples to pass through tissue of both sections of the organ and deform against the anvil. During the firing step, a circular knife is advanced to cut tissue inside the staple line, thereby establishing a passage between the two sections of the organ. After firing, the instrument is typically removed by withdrawing the anvil through the staple line, after which the surgeon will carefully inspect the surgical site to ensure a proper anastomosis has been achieved.
While circular staplers are helpful in a number of surgical procedures, it is desirable to reduce the incidents of anastomotic leak, tears of tissue during stapler extraction, bleeding, and other complications. In order to reduce such incidents, buttress or reinforcing materials have been utilized. However, due to the inherent difficulty in positioning and securing such materials with the instrument, a need exists for the buttress material that can be safely and effectively positioned within staple cartridge and/or anvil.
SUMMARY
In accordance with an embodiment of the present disclosure, there is provided an apparatus for joining two hollow organ sections with an annular array of surgical staples. The apparatus includes a staple cartridge component, an anvil component, a knife member, a buttress mount and a buttress member. The staple cartridge component includes a plurality of surgical staples in an annular array. The anvil component defines a plurality of staple pockets for deforming the surgical staples. The anvil component is movable relative to the staple cartridge component between spaced apart and approximated positions to adjustably clamp tissue between the staple cartridge and anvil components. The knife member is concentrically arranged with the plurality of surgical staples in the staple cartridge component. The knife member defines a lumen therethrough. The knife member is movable relative to the staple cartridge component. The buttress mount is concentrically disposed at least partially within the lumen of the knife member. The buttress mount includes a plurality of spokes radially extending outward and a plurality of legs detachably secured with an inner wall of the knife member. The buttress member is secured with the plurality of spokes of the buttress mount. The buttress member is concentrically aligned with the plurality of surgical staples.
In an embodiment, the buttress member may have an annular configuration. The buttress member may be disposed in a juxtaposed relation with the plurality of surgical staples. In addition, the plurality of spokes of the buttress mount may at least partially engage an inner portion of the buttress member. Alternatively, the plurality of spokes may engage a proximal surface the buttress member. The plurality of spokes may engage a distal surface the buttress member. The buttress member may be disposed distal of the buttress mount, as well as proximal of the plurality of spokes of the buttress mount.
The plurality of legs may each include a protrusion radially extending outward. The knife member may define a plurality of bores in an inner wall thereof. The plurality of bores may be configured and dimensioned to securely engage the protrusions of the plurality of legs therein. The buttress mount may further include an annular ring member from which the plurality of spokes radially extend outward. In particular, the annular ring member of the buttress mount may be dimensioned to receive an actuation shaft that effects axial movement of the anvil component between spaced apart and approximated positions to adjustably clamp tissue. Moreover, the annular ring member of the buttress mount may be coplanar with the buttress member. In other embodiments, the plurality of legs may be flexible. In addition, the buttress member may be made of a biodegradable material.
In accordance with another embodiment of the present disclosure, there is provided an apparatus for joining two hollow organ sections with an annular array of surgical staples. The apparatus includes a staple cartridge, an anvil component, a knife member, and a buttress member. The staple cartridge component includes a plurality of surgical staples in an annular array. The anvil component defines a plurality of staple pockets for deforming the surgical staples. The anvil component is movable relative to the staple cartridge component between spaced apart and approximated positions to adjustably clamp tissue between the staple cartridge and anvil components. The knife member is concentrically arranged with the plurality of surgical staples in the staple cartridge component. The knife member defines a lumen therethrough. The knife member is movable relative to the staple cartridge component. The buttress member includes at least a pair of anchor portions. The pair of anchor portions securely engages an inner wall of the staple cartridge component.
In an embodiment, the buttress member may be concentrically aligned with the plurality of surgical staples. In addition, the apparatus may further include an O-ring disposed within the staple cartridge component. The O-ring may apply outward force to the pair of anchor portions against the inner wall of the staple cartridge component. The staple cartridge component may define at least a pair of cavities.
In another embodiment, each of the pair of cavities may be configured and dimensioned to receive each of the pair of anchor portions. The anchor portion may include a neck portion and a head portion. The head portion may have a larger width than that of the neck portion. The pair of cavities may each include a base portion and a neck portion. The base portion of the cavity may be dimensioned to receive therethrough the head portion of the anchor portion, and the neck portion of the cavity may be dimensioned to receive the neck portion of the anchor portion. The pair of anchor portions of the buttress member may diametrically oppose each other. The pair of anchor portions of the buttress member may extend radially inward.
In accordance with still another embodiment of the present disclosure, there is provided an apparatus for joining two hollow organ sections with an annular array of surgical staples. The apparatus includes a handle assembly, an elongate tubular member, a staple cartridge component, an anvil component, a knife member, a buttress mount, and a buttress member. The handle assembly includes a firing trigger. The elongate tubular member extends distally from the handle assembly. The staple cartridge component is coupled to a distal portion of the elongate tubular member. The staple cartridge component includes a plurality of surgical staples in an annular array. The anvil component defines a plurality of staple pockets for deforming the surgical staples. The anvil component is movable relative to the staple cartridge component between spaced apart and approximated positions to clamp tissue between the staple cartridge and anvil components. The knife member is concentrically arranged with the plurality of surgical staples in the staple cartridge component. The knife member defines a lumen therethrough. The knife member is movable relative to the staple cartridge component. The buttress mount is concentrically disposed with the lumen of the knife member. The buttress mount includes a plurality of legs detachably secured with an inner wall of the lumen of the knife member. The buttress member is coupled with the plurality of legs of the buttress mount. The buttress member is concentrically aligned with the plurality of surgical staples.
The plurality of legs of the buttress mount may each include a radially extending component and a longitudinally extending component. The radially extending component may be at least partially affixed to the buttress member, and the longitudinally extending component may securely engage the lumen of the knife member.
In accordance with yet another embodiment of the present disclosure, there is provided an apparatus for joining two hollow organ sections with an annular array of surgical staples. The apparatus includes a staple cartridge component, an anvil component, a knife member and a buttress member. The staple cartridge component includes a plurality of surgical staples in an annular array. The anvil component includes an anvil plate defining a plurality of staple pockets for deforming the surgical staples and a rim disposed around a periphery of the anvil plate. The anvil component defines a circumferential gap between the anvil plate and the rim. The anvil component is movable relative to the staple cartridge component between spaced apart and approximated positions to adjustably clamp tissue between the staple cartridge and anvil components. The knife member is concentrically arranged with the plurality of surgical staples in the staple cartridge component. The knife member defines a lumen therethrough. The knife member is movable relative to the staple cartridge component. The buttress member at least partially engages the circumferential gap defined in the anvil component.
In an embodiment, the buttress member may have an annular profile. The rim of the anvil component may be configured and dimensioned to enclose a distal surface of the staple cartridge component.
In accordance with still yet another embodiment of the present disclosure, there is provided an apparatus for joining two hollow organ sections with an annular array of surgical staples. The apparatus includes staple cartridge component, an anvil component, and a buttress member. The staple cartridge component includes a distal surface. The distal surface defines an annular array of surgical staple receiving slots and a groove. The anvil component is movable relative to the staple cartridge component between spaced apart and approximated positions to adjustably clamp tissue between the staple cartridge and anvil components. The buttress member at least partially engages the groove defined the distal surface of the staple cartridge component.
The buttress member may include circumferentially arranged tabs configured and dimensioned to be received in the groove defined in the distal surface of the staple cartridge component. Moreover, the groove defined in the distal surface of the staple cartridge component may be a circumferential groove defined in a periphery of the staple cartridge component.
In an embodiment, the anvil component may include an anvil plate defining a plurality of staple pockets for deforming the surgical staples and a rim disposed around a periphery of the anvil plate. The anvil component may define a circumferential gap between the anvil plate and the rim. The apparatus may further include a second buttress member at least partially engaging the circumferential gap defined in the anvil component. The apparatus may also include a knife member concentrically arranged with the plurality of surgical staples in the staple cartridge component, wherein the knife member is movable relative to the staple cartridge component.



BRIEF DESCRIPTION OF THE DRAWINGS
Various embodiments of the present disclosure are described hereinbelow with reference to the drawings, wherein:
FIG. 1 is a perspective view of an annular surgical stapling apparatus configured for use with a surgical buttress assembly in accordance with an embodiment of the present disclosure illustrating an anvil assembly and the buttress assembly detached from the surgical stapling apparatus;
FIG. 2 is a perspective view of an anvil assembly of the surgical stapling apparatus of FIG. 1;
FIG. 3 is a partial perspective view of the surgical stapling apparatus of FIG. 1 illustrating a surgical buttress assembly mounted on a distal portion of the surgical stapling apparatus;
FIG. 4 is a perspective view of a head portion of the surgical stapling apparatus of FIG. 1 with parts separated;
FIG. 5 is a perspective view of a buttress member of the surgical buttress assembly of FIG. 1;
FIG. 6 is a perspective view of a buttress mount of the surgical buttress assembly of FIG. 1;
FIG. 7 is a top, plan view of the surgical buttress assembly of FIG. 1;
FIG. 8 is a longitudinal cross-sectional view of a distal end portion of the surgical stapling apparatus of FIG. 1;
FIG. 9 is a top, plan view of an embodiment of a surgical buttress assembly for use with the surgical stapling apparatus of FIG. 1;
FIG. 10 is a top, plan view of another embodiment of a surgical buttress assembly for use with the surgical stapling apparatus of FIG. 1;
FIG. 11 is a perspective view of the surgical buttress assembly of FIG. 10 with the buttress member and the buttress mount separated;
FIG. 12 is a top, plan view of another embodiment of a surgical buttress assembly for use with the surgical stapling apparatus of FIG. 1;
FIG. 13 is a perspective view of still another embodiment of a surgical buttress assembly for use with the surgical stapling apparatus of FIG. 1;
FIGS. 14-17 are longitudinal cross-sectional views of a distal end portion of the surgical stapling apparatus of FIG. 1 illustrating a method of use therefor;
FIG. 18 is a perspective view of a buttress member in accordance with another embodiment of the present disclosure;
FIG. 19 is a perspective view of a surgical cartridge assembly of FIG. 1 having the buttress member of FIG. 18 mounted thereon;
FIG. 20 is a perspective view of the buttress member of FIG. 18 mounted on the surgical cartridge assembly of FIG. 19 illustrating its use with an O-ring;
FIG. 21 is a longitudinal cross-sectional view of the surgical cartridge assembly of FIG. 20 having the buttress member of FIG. 18 mounted thereon;
FIGS. 22-24 are top, plan views of various embodiments of buttress members;
FIG. 25 is a perspective view of a surgical cartridge assembly configured for use with the buttress members of FIGS. 22-24;
FIG. 26 is a perspective view of another embodiment of a buttress member for use with the surgical stapling apparatus of FIG. 1;
FIG. 27 is a top, plan view of the buttress member of FIG. 26;
FIG. 28 is a perspective view of an anvil assembly configured for use with the buttress member of the buttress assembly of FIG. 1;
FIG. 29 is a perspective view of the anvil assembly of FIG. 28 with the buttress member separated therefrom;
FIG. 30 is a longitudinal cross-sectional view of the anvil assembly of FIG. 28;
FIG. 31 is a perspective view of a staple cartridge assembly configured to directly mount the buttress member of FIG. 1 thereon illustrating the buttress member separated therefrom;
FIG. 32 is a perspective view of the staple cartridge assembly of FIG. 31 having the buttress member of FIG. 1 directly mounted thereon;
FIG. 33 is a longitudinal cross-sectional view of the staple cartridge assembly of FIG. 32 having the buttress member of FIG. 1 directly mounted thereon;
FIG. 34 is a top, plan view of another embodiment of a buttress member for use with the stapling cartridge assembly of FIG. 31; and
FIG. 35 is a top, plan view of another embodiment of a staple cartridge assembly configured for use with the buttress member of FIG. 34.



DETAILED DESCRIPTION OF EMBODIMENTS
Embodiments of the present disclosure will now be described in detail with reference to the drawings, in which like reference numerals designate identical or corresponding elements in each of the several views. As used herein, the term “distal,” as is conventional, will refer to that portion of the instrument, apparatus, device or component thereof which is farther from the user while, the term “proximal,” will refer to that portion of the instrument, apparatus, device or component thereof which is closer to the user. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the present disclosure in unnecessary detail.
With reference to FIG. 1, a surgical stapling apparatus 10 for performing circular anastomosis of hollow organs is shown. Surgical stapling apparatus 10 drives a circular array of staples 7 (FIG. 8) through the end sections of each organ and simultaneously cores any tissue interior of the driven circular array of staples 7 to free the tubular passage, and thereby joining two ends of the organ. Surgical stapling apparatus 10 includes a handle assembly 20 having a pair of pivotable actuating handle members 22 and an advancing means 24 including a rotatable grip member 26, an elongate body portion 30 extending distally from handle assembly 20, and a head portion 50 including an anvil assembly 60, a staple cartridge assembly 70, and a surgical buttress assembly 100 in accordance with an embodiment of the present disclosure. The components of surgical apparatus 10 are generally formed from thermoplastics including polycarbonates, and metals including stainless steel and aluminum. The particular material selected to form a particular component will depend upon the strength requirements of the particular component. Staples 7 are of a conventional type and include a backspan having a pair of legs extending from the backspan. The legs terminate in tissue penetrating tips.
Handle assembly 20 can be actuated to approximate anvil assembly 60 relative to staple cartridge assembly 70 and to apply a pair of annular arrays of staples 7 through tissue. In order to properly position tissue in head portion 50, rotatable grip member 26 may be rotated to move anvil assembly 60 axially relative to staple cartridge assembly 70 between a spaced apart position and an approximated position in which anvil assembly 60 is positioned adjacent staple cartridge assembly 70 to clamp tissue therebetween. Handle members 22 may be squeezed to fire staples 7 through tissue to join two segments of tubular tissues together, as will be discussed in detail below.
Elongate body portion 30 is constructed to have a slightly curved/bent shape along its length. However, elongate body portion 30 may also be straight, as well as flexible to bend to any configuration. The length, shape and/or the diameter of elongate body portion 30 may be varied to suit a particular surgical procedure.
With reference to FIGS. 2-4, head portion 50 includes anvil assembly 60, staple cartridge assembly 70 and surgical buttress assembly 100 detachably secured with staple cartridge assembly 70. Staple cartridge assembly 70 may be fixedly connected to a distal end portion of elongate body portion 30 or may be configured to concentrically fit within the distal end portion of elongate body portion 30. In particular, staple cartridge assembly 70 defines a pair of annular arrays of staple receiving slots 72 having staple 7 disposed in each one of staple receiving slots 72. In addition, staple cartridge assembly 70 includes a cylindrical knife 76 concentrically arranged with the pair of annular array of staples 7 and a plurality of staple pushers 9 (FIG. 8) each disposed in staple receiving slot 72 to eject staple 7 through slot 72. Staples 7 travel through slots 72 and tissue toward anvil assembly 60.
With particular reference to FIG. 4, cylindrical knife 76 includes a distal rim 79 defining a knife blade adapted to cut tissue and portions of surgical buttress assembly 100. Moreover, cylindrical knife 76 defines a plurality of lateral bores 77. Each lateral bore 77 is adapted to support a portion of surgical buttress assembly 100 therein, as will be discussed in detail below. Cylindrical knife 76 is slidably mounted against inner wall 78 of staple cartridge assembly 70. Upon actuation of handle members 22, cylindrical knife 76 is moved distally to cut tissue and portions of surgical buttress assembly 100, and the plurality of pushers 9 are moved distally to eject staples 7 disposed in staple receiving slots 72 therethrough, toward anvil assembly 60.
Positioned distally of staple cartridge assembly 70 is anvil assembly 60 including an anvil member 62 and a shaft 64 extending proximally from anvil member 62. Anvil member 62 includes a plurality of pockets for receiving and deforming staples 7. Shaft 64 is configured to be detachably received in approximation shaft 75 (FIG. 4) disposed in elongate body portion 30. Approximation shaft 75 is operatively coupled with rotatable grip member 26 of handle assembly 20, whereby rotation of rotatable grip member 26 moves approximation shaft 75 axially. Such axial movement of approximation shaft 75 is imparted to anvil assembly 60 detachably coupled with approximation shaft 75. In this manner, anvil assembly 60 is movable axially relative to staple cartridge assembly 70 between a spaced apart position and an approximated position in which anvil assembly 60 is positioned adjacent staple cartridge assembly 70 to adjustably clamp tissue between anvil assembly 60 and staple cartridge assembly 70.
Examples of instruments for performing circular anastomosis of hollow organs are described in U.S. Pat. Nos. 6,053,390, 5,588,579, 5,119,983, 5,005,749, 4,646,745, 4,576,167, and 4,473,077, each of which is incorporated herein in its entirety by reference.
With continued reference to FIG. 4, surgical buttress assembly 100 includes a buttress member 110 and a buttress mount 120 concentrically arranged with buttress member 110. Buttress member 110 is provided to reinforce and seal staple lines applied to tissue by surgical stapling apparatus 10.
Buttress member 110 has an annular profile configured to be concentrically aligned with staple cartridge assembly 70. In particular, buttress member 110 is positionable adjacent a distal surface 74 of staple cartridge assembly 70. The annular profile of buttress member 110 is configured and dimensioned to be flush with an outer peripheral edge of staple cartridge assembly 70 when supported on staple cartridge assembly 70. Moreover, buttress member 110 is superposed with the pair of annular arrays of staple receiving slots 72. In this manner, when staples 7 are ejected through the pair of annular arrays of staple receiving slots 72, the legs of each staple 7 penetrate through buttress member 110 and the backspan of the staple 7 is secured against a proximal surface of buttress member 110.
Buttress member 110 is fabricated from a biocompatible material which is bio-absorbable or non-absorbable, as well as natural or synthetic materials. It should be understood that any combination of natural, synthetic, bio-absorbable, and non-bioabsorbable materials may be used to form buttress member 110.
In addition, buttress member 110 may be porous, non-porous, or combinations thereof. It is also envisioned that buttress member 110 described herein may contain a plurality of layers in which any combination of non-porous and porous layers may be configured. For example, buttress member 110 may be formed to include multiple non-porous layers and porous layers that are stacked in an alternating manner. In another example, buttress member 110 may be formed in a “sandwich-like” manner wherein the outer layers of buttress member 110 include porous layers and the inner layers are non-porous layers. Examples of multi-layered buttress members are disclosed in U.S. Patent Application Publication No. 2009/0001122, filed on Jun. 27, 2007, entitled “Buttress and Surgical Stapling Apparatus,” the entire disclosure of which is incorporated by reference therein.
In particular, the use of non-porous layers in buttress member 110 may enhance the ability of buttress member 110 to resist tears and perforations during the manufacturing, shipping, handling, and stapling processes. In addition, the use of a non-porous layer in the surgical buttress may also retard or inhibit tissue ingrowth from surrounding tissues, and thereby acting as an adhesion barrier and inhibiting the formation of unwanted scar tissue.
In addition, at least one bioactive agent may be combined with buttress member 110. The agent may be disposed on a surface of the surgical buttress and/or impregnated therein. In these embodiments, buttress member 110 can also serve as a vehicle for delivery of the bioactive agent. The term “bioactive agent,” as used herein, is used in its broadest sense and includes any substance or mixture of substances that have clinical use.
With reference now to FIGS. 5-8, buttress member 110 is detachably positioned adjacent surface 74 (FIG. 4) of staple cartridge assembly 70 by buttress mount 120. Buttress mount 120 includes a core ring 122, support arms 124 radially extending outward from core ring 122, and mount legs 126 also radially extending outward from core ring 122. Support arms 124 are circumferentially arranged about core ring 122. Support arms 124 are configured and dimensioned to be affixed to an inner wall 112 of buttress member 110 or to a lower surface of buttress member 110. In particular, distal end portions 124a of support arms 124 are affixed to buttress member 110 by, for example, adhesive, ultrasonic welding, or the like.
Mount legs 126 are circumferentially arranged about core ring 122, such that each mount leg 126 is interposed between a pair of adjacent support arms 124. Each mount leg 126 includes a radially extending component 126a and a longitudinally extending component 126b. Each longitudinally extending component 126b includes a protrusion 126c that is dimensioned and adapted to securely engage lateral bore 77 defined in cylindrical knife 76. Securement of protrusions 126c in lateral bores 77 of cylindrical knife 76 enables detachable mounting of buttress assembly 100 on staple cartridge assembly 70. In particular, mount legs 126 may be made of flexible or elastic material to enable flexing of mount legs 126, whereby a user may simply, for example, squeeze mount legs 126 radially inward, to attach or detach buttress assembly 100 to and from cylindrical knife 76. It is further contemplated that while core ring 122, support arm 124 and mount legs 126 have been described as individually manufactured components, such components may be monolithically formed as a single construct.
With particular reference now to FIG. 8, buttress member 110 is superposed with staple receiving slots 72 defined in distal surface 74 of staple cartridge assembly 70 and is coupled with core ring 122 by support arm 124. Core ring 122 is also coupled to mount legs 126, as described above. Protrusions 126c of mount legs 126 securely engage lateral bores 77 defined in cylindrical knife 76, which is disposed radially inward of annular array of staple receiving slots 72. In this manner, upon actuation of handle members 22, a portion of buttress member 110 is stapled with tissue to reinforce tissue, and the remaining portions of buttress member 110 and buttress mount 120 are cut and detached from the portion of buttress member 110 stapled with tissue.
With reference to FIG. 9, in another embodiment, it is further envisioned that buttress mount 220 need not be substantially coplanar with buttress member 110, as shown in, for example, FIG. 4. Rather, support arms 224 may be disposed proximal of buttress member 110 to provide a more secure contact between support arm 224 of buttress mount 220 and buttress member 110 (by providing a greater area of contact), whereby an outer edge portion of support arm 224 (shown in phantom) is affixed to buttress member 110 by, for example, adhesive or ultrasonic welding or the like.
With reference now to FIGS. 10 and 11, support arms 324 of another embodiment of a buttress mount 320 may be disposed distal of buttress member 110, and thereby providing a more secure mounting of buttress member 110 on staple cartridge assembly 70. Support arms 324 aid in pressing buttress member 110 against distal surface 74 of staple cartridge assembly 70. Under such configurations, it is contemplated that at least the outer edge portions of support arms 324 that are stapled to tissue are fabricated from a bio-absorbable material.
With reference to FIG. 12, it is further envisioned that a buttress member 410 may have a circular cross-section to improve mounting of buttress member 410 on distal surface 74 of staple cartridge assembly 70. By providing a greater contact area between buttress member 410 and support arms 424, the force applied to buttress member 410 by support arm 424 is more evenly distributed throughout buttress member 410, which may inhibit tear or damage to buttress member 410. While support arms 424, as shown, are positioned distal of buttress member 410, it is also envisioned that support arms 424 may be positioned proximal of buttress member 410.
With reference to FIG. 13, it is further envisioned that buttress mount assembly 100 may be simplified by having buttress member 110 coupled to core ring 122 by mount legs 526. Specifically, mount legs 526 are utilized to couple buttress member 110 to core ring 122, and to detachably engage lateral bores 77 defined in cylindrical knife 76. In particular, each mount leg 526 includes a radially extending component 526a, a longitudinally extending component 526b, and a protrusion 526c dimensioned and adapted to securely engage lateral bores 77 in cylindrical knife 76. According to the present disclosure, longitudinally extending component 526b is attached to inner wall 112 of buttress member 110. However, longitudinally extending components 526b of mount legs 526 may be radially flexible to enable a user to detachably secure buttress 110 to cylindrical knife 76 (as described hereinabove with respect to mount legs 126).
With reference to FIGS. 14-17, surgical stapling apparatus 10 is used in an anastomosis procedure to effect joining of, for example, two opposing intestinal sections “T1, T2.” The anastomosis procedure is typically performed using minimally invasive surgical techniques including laparoscopic means and instrumentation. Initially, a diseased intestinal section is removed. Thereafter, anvil assembly 60 is inserted to the operative site either through a surgical incision or transanally and is positioned within the intestinal section “T1.” Elongate body portion 30 of surgical stapling apparatus 10 including staple cartridge assembly 70 is inserted transanally into the other intestinal section “T2.” The intestinal sections “T1, T2” are then temporarily secured about their respective components (e.g., shaft 64 of anvil assembly 60 and the distal end of elongate body portion 30) by conventional means such as a purse string suture “P.”
Thereafter, the clinician maneuvers anvil assembly 60 until the proximal end of shaft 64 is inserted into the distal end of approximation shaft 75 disposed in elongate body portion 30 of surgical stapling apparatus 10. Shaft 64 engages approximation shaft 75 to be operable as a unitary construct, as shown in FIG. 15. Anvil assembly 60 and elongate body portion 30 are then approximated to approximate the intestinal sections “T1, T2,” as shown in FIG. 16. Surgical stapling apparatus 10 is then fired, effecting stapling of the intestinal sections “T1, T2” to one another, while cylindrical knife 76 cuts a portion of buttress member 110 and tissue disposed interior of cylindrical knife 76, and thereby detaching buttress mount 120 and an inner portion of buttress member 110 from the portion of buttress member 110 that is clamped (approximated) between distal surface 74 of staple cartridge assembly 70 and anvil assembly 60 to complete the anastomosis.
With reference to FIG. 18, a buttress member 610 in accordance with another embodiment of the present disclosure is illustrated. In contrast to the above-described buttress member 110, buttress member 610 simplifies a buttress assembly by eliminating the need for buttress mount 120. Buttress member 610 is substantially similar to buttress member 110. However, buttress member 610 includes a plurality of longitudinally extending tabs 620 circumferentially arranged about buttress member 610. Longitudinally extending tabs 620 slightly extend radially outward, such that when buttress member 610 is disposed on distal surface 74 of staple cartridge assembly 70 and is superposed with the pair of annular array of staple receiving slots 72, tabs 620 press or apply outward force against inner wall 78 of staple cartridge assembly 70. Such configuration enables buttress member 610 to be securely positioned in place with respect to staple cartridge assembly 70.
With reference to FIG. 20, it is further contemplated that a resilient O-ring 630 may be utilized with buttress member 610. O-ring 630 further applies outward force against tabs 620, which press against inner wall 78 of staple cartridge assembly 70.
With reference to FIG. 21, prior to the actuation of cylindrical knife 76, distal portions of tabs 620 of buttress member 610 are at least partially disposed on distal rim 79 of cylindrical knife 76 defining a knife blade. Under such configuration, when cylindrical knife 76 is actuated, knife 76 travels distally between inner wall 78 of staple cartridge assembly 70 and tabs 620 to cut tabs 620 from a portion of buttress member 610 that is attached with tissue. Moreover, in order to improve securement of the distal portions of tabs 620 against inner wall 78 and on distal rim 79 of cylindrical knife 76, resilient O-ring 630 is utilized and is positioned distal of distal rim 79 of cylindrical knife 76. The use and operation of buttress member 610 is substantially similar to the use and operation of buttress member 110 described hereinabove, and thus will not be described herein.
With reference to FIGS. 22-24, it is further contemplated that buttress members 710, 810, 910 may include two pairs of diametrically opposing tabs 720, 820, 920, respectively, having various shapes and profiles. Each tab 720, 820, 920 includes a respective neck portion 722, 822, 922 extending radially inward from respective annular shaped portions 750, 850, 950 of respective buttress members 710, 810, 910 and a respective head portion 724, 824, 924 having a width larger than that of respective neck portions 722, 822, 922.
With reference to FIG. 25, it is contemplated that a staple cartridge assembly 770 may define cavities 777 in lateral wall thereof to receive respective tabs 720, 820, 920 of respective buttress member 710, 810, 910 having various shapes and cross-sections. Each cavity 777 is adapted to receive tabs 720, 820, 920 of a respective buttress member 710, 810, 910 having various shapes and cross-sections. In particular, each cavity 777 has a T-shaped cross-section including a base portion 777a and a neck portion 777b having a smaller width than that of base portion 777a. 
Each head portion 724, 824, 924 of respective buttress member 710, 810, 910 is configured to be received through base portion 777a of staple cartridge assembly 770 such that head portion 724, 824, 924 is disposed radially outward of base portion 777a of cavity 777. Neck portions 722, 822, 922 of respective tabs 720, 820, 920 are configured and dimensioned to be inserted through neck portion 777b of cavity 777.
It is contemplated that each tab 720, 820, 920 may be made of an elastic material to enable flexible stretching of tab 720. Thus, when head portions 724, 824, 924 of respective tabs 720, 820, 920 are securely anchored to neck portions 777b of cavities 777, neck portions 722, 822, 922 of respective tabs 720, 820, 920 are stretched to facilitate secure engagement of respective buttress member 710, 810, 910 with distal surface 774 of staple cartridge assembly 770.
With reference to FIGS. 26 and 27, a buttress member 1010 in accordance with another embodiment of the present disclosure includes tabs 1020 configured to be detachably secured to cylindrical knife 76 of staple cartridge assembly 70. In particular, buttress member 1010 includes an annular shaped portion 1012 and a pair of diametrically opposing tabs 1020. Each tab 1020 includes a peg or a pin 1014 extending radially outward. Each peg 1014 is configured and dimensioned to be received in lateral bore 77 of cylindrical knife 76 of staple cartridge assembly 70. Under such configuration, buttress member 1010 is securely mounted on staple cartridge assembly 70 without having to use a buttress mount.
Buttress member 110 described hereinabove has utilized staple cartridge assembly 70 as a way to be secured with surgical stapling apparatus 10. However, with reference to FIGS. 28-30, buttress member 110 may be mounted on an anvil assembly 260. Similar to anvil assembly 60, anvil assembly 260 includes anvil member 262 defining a plurality of pockets against which legs of staple 7 are deformed and a shaft 264 extending from anvil member 262.
With particular reference to FIG. 30, anvil member 262 includes a rim 266 defining an arcuate portion 267. Arcuate portion 267 engages an outer wall 71 (FIG. 4) of staple cartridge assembly 70, whereby anvil member 262 encloses distal surface 74 of staple cartridge assembly 70. In particular, a gap 269 is defined between arcuate portion 267 and an underside 265 of anvil member 262, such that buttress member 110 is at least partially wedged and securely supported within gap 269. In this manner, buttress member 110 is securely mounted on anvil assembly 260 without having to utilize a buttress mount.
With reference now to FIGS. 31-33, a staple cartridge assembly 1270 defines a circumferential groove 1271 concentrically arranged with a pair of annular arrays of staple receiving slots 1272. Distal surface 1274 of staple cartridge assembly 1270 includes an overhang 1280 that partially covers groove 1271, whereby when a peripheral portion 117 of buttress member 110 is disposed in groove 1271, overhang 1280 ensures that peripheral portion 117 of buttress member 110 is securely retained in groove 1271. In this manner, buttress member 110 is directly mounted on staple cartridge assembly 1270 without having to utilize buttress mount 120.
With reference to FIGS. 34 and 35, it is also envisioned that a staple cartridge assembly 1370 may define discrete grooves 1371 on a distal surface 1374 therein. Discrete grooves 1371 are circumferentially arranged about staple cartridge assembly 1370. Each groove 1371 may be configured and dimensioned to receive therein a portion of a buttress member 1310. Buttress member 1310 is substantially similar to buttress members described hereinabove. Buttress member 1310, however, includes tabs 1320 that radially extend outward. Each tab 1320 is configured and dimensioned to be disposed in a respective groove 1371 of staple cartridge assembly 1370. As discussed hereinabove, each groove 1371 may be at least partially covered by an overhang 1380, whereby when tabs 1320 of buttress member 1310 are disposed in grooves 1371 overhang 1380 ensures that tabs 1320 are securely retained in groove 1371.
Although the illustrative embodiments of the present disclosure have been described herein with reference to the accompanying drawings, the above description, disclosure, and figures should not be construed as limiting, but merely as exemplifications of particular embodiments. It is to be understood, therefore, that the disclosure is not limited to those precise embodiments, and that various other changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the disclosure.

## Claims

1. An apparatus for joining two hollow organ sections, the apparatus comprising:
a staple cartridge component including a plurality of surgical staples in an annular array;
an anvil component defining a plurality of staple pockets for deforming the plurality of surgical staples, the anvil component movable relative to the staple cartridge component between spaced apart and approximated positions to adjustably clamp tissue between the staple cartridge and anvil components;
a knife member concentrically arranged with the plurality of surgical staples in the staple cartridge component, the knife member defining a lumen therethrough, the knife member movable relative to the staple cartridge component; and
a buttress member including a pair of anchor portions securely engaging an inner wall of the staple cartridge component, the inner wall defining a passage dimensioned to receive the knife member therein, wherein each anchor portion of the pair of anchor portions is disposed radially inward of the inner wall of the staple cartridge component.

2. The apparatus according to claim 1, wherein the buttress member is concentrically aligned with the annular array of the plurality of surgical staples.

3. The apparatus according to claim 2, further comprising an O-ring disposed within the staple cartridge component, the O-ring applying outward force to the pair of anchor portions against the inner wall of the staple cartridge component.

4. The apparatus according to claim 1, wherein the staple cartridge component defines a pair of cavities, each cavity of the pair of cavities configured and dimensioned to receive the respective anchor portion of the pair of anchor portions.

5. The apparatus according to claim 4, wherein each anchor portion of the pair of anchor portions includes a neck portion and a head portion, the head portion having a larger width than a width of the neck portion.

6. The apparatus according to claim 5, wherein each cavity of the pair of cavities includes a base portion and a neck portion, the base portion dimensioned to receive therethrough the head portion of the anchor portion and the neck portion dimensioned to receive the neck portion of the anchor portion.

7. The apparatus according to claim 1, wherein each anchor portion of the pair of anchor portions of the buttress member diametrically opposes each other.