S&F Ref: 753737D1 AUSTRALIA PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT Name and Address Tyco Healthcare Group LP, of 555 Long Wharf Drive, of Applicant: New Haven, Connecticut, 06856, United States of America Actual Inventor(s): William L. D'Agostino Michael Bettuchi Address for Service: Spruson & Ferguson St Martins Tower Level 35 31 Market Street Sydney NSW 2000 (CCN 3710000177) Invention Title: Anastomosis composite gasket The following statement is a full description of this invention, including the best method of performing it known to me/us: 5845c(5892434_1) ANASTOMOSIS COMPOSITE GASKET BACKGROUND Technical Field 100011 The present disclosure relates to gaskets and, more particularly, to composite gaskets for use in conjunction with stapling devices, for reducing occurrences of leaking, bleeding and/or stricture when anastomosing various body structures. Background of Related Art [0002] Staples have traditionally been used to replace suturing when joining or anastomosing various body structures such as, for example, the bowel or bronchus. The surgical stapling devices employed to apply these staples are generally designed to simultaneously cut and seal an extended segment of tissue in a patient, thus vastly reducing the time and risks of such procedures. [0003] Linear or annular surgical stapling devices are employed by surgeons to sequentially or simultaneously apply one or more linear rows of surgical fasteners, e.g., staples or two-part fasteners, to body tissue for the purpose ofjoining segments of body tissue together and/or for the creation of anastomoses. Linear surgical stapling devices generally include a pair ofjaws or finger-like structures between which body tissue to be joined is placed. When the surgical stapling device is actuated and/or "fired", firing bars move longitudinally and contact staple drive members in one of the jaws, and surgical staples are pushed through the body tissue and into/against an anvil in the opposite jaw thereby crimping the staples closed. A knife blade may be provided to cut between the rows/lines of staples. Examples of such surgical stapling devices are described in U.S. Patent Nos. 4,354,628, 5,014,899 and 5,040,715, the entirety of each of which is incorporated herein by reference. [0004] In addition to the use of surgical staples, biological tissue adhesives have been developed for tissue repair and the creation of anastomoses. Generally, biological adhesives bond separated tissues together to aid in the healing process and to enhance tissue strength. Such adhesives may be used instead of suturing and stapling, for example, in surgical procedures for the repair of tissue or the creation of anastomoses. [0005] Generally, following the formation of the anastomosis, a separate instrument or device is used to apply biological sealants to the outer surface of the anastomosis. Typically, in a separate step, the biological sealants are applied to the outer surface of the anastomosis by spraying, brushing, swabbing, any combinations thereof, or any other method contemplated by those skilled in the art. The biological sealants act to reduce and/or stop the incidents of leakage from the anastomosis. [0006] The application of a suitable biocompatible adhesive offers many advantages to the patient and the surgeon alike, such as, for example, the possible reduction in the number of staples used, immediate sealing of the tissue being treated, a strengthening of the anastomosis, and a reduction in the occurrence of bleeding from the blood vessels, leakage through the tissue joint, and stricture. Moreover, use of biocompatible adhesives tends to minimize foreign body reaction and scarring. 2 100071 Annular surgical stapling devices generally include an annular staple cartridge assembly including a plurality of annular rows of staples, typically two, an anvil assembly operatively associated with the annular cartridge assembly, and an annular blade disposed internal of the rows of staples. Examples of such annular surgical stapling devices are described in U.S. Patent Nos. 5,799,857 and 5,915,616 to Robertson et al., the entirety of each of which is incorporated herein by reference. [00081 In general, an end-to-end anastomosis stapler typically places an array of staples into the approximated sections of a patient's bowels or other tubular organs. The resulting anastomosis contains an inverted section of bowel which contains numerous "B" shaped staples to maintain a secure connection between the approximated sections of bowel. [0009] For most procedures, the use of bare staples, with the staples in direct contact with the patient's tissue, is generally acceptable. The integrity of the tissue will normally serve to prevent the staples from tearing out of the tissue and compromising the sealing before healing has occurred. However, in some surgical operations, surgical supports, e.g., meshes, are employed by surgeons in combination with linear stapling devices to bridge, repair and/or reinforce tissue defects within a patient, especially those occurring in the abdominal wall, chest wall, diaphragm, and other musculo-aponeurotic areas of the body. Examples of suitable surgical supports are disclosed in U.S. Patent Nos. 3,054,406, 3,124,136, 4,347,847, 4,655,221, 4,838,884 and 5,002,551, the entirety of each of which is incorporated herein by reference. 3 [0010] When the staples are applied in surgical procedures utilizing surgical supports (i.e., reinforcing material), the legs of the staple typically pass from the cartridge jaw through a layer of the surgical support, and through the patient's tissue before encountering the anvil jaw. In an alternative procedure, the legs of the staple typically pass from the cartridge jaw through a first layer of the surgical support, then through the patient's tissue, and finally through a second layer of the surgical support before encountering the anvil jaw. With the staples in place, the stapled tissue is clamped between the layers of the surgical support. [0011] While the surgical supports described above are used in conjunction with linear surgical stapling devices, the need exists for annular support structures for use in conjunction with annular or circular surgical stapling devices, for example, an end-to-end anastomosis stapler such as a Model "EEATM" instrument available from United States Surgical, a Division of Tyco Health-Care Group, LP, Norwalk, CT and disclosed in U.S. Patent No. 5,392,979 to Green et al. [0012] One possible side effect of any end-to-end bowel anastomosis is its tendency to undergo stenosis over time, which can decrease the diameter of the lumen over time. Accordingly, the need exists for an annular surgical structure which operates in conjunction with any end-to-end, annular, or circular anastomosis or stapling device and assists in keeping open the lumen of the anastomosed bowel or other tubular organ over time. There is also a need for a gasket, which would function to seal the anastomosed bowel or other body organ against leakage from between the tissue sections being joined. 4 5 [00131 A need also exists for an annular support structure which operates in conjunction with any end-to-end, annular or circular stapling device to reduce the trauma suffered by the patient, reduce the instances of leakage, reduce the instances of bleeding, and create a relatively strong bond between adjacent body tissues. OBJECT OF THE INVENTION [0013a] It is the object of the present invention to substantially overcome or ameliorate one or more of the disadvantages of the prior art, or at least provide a useful alternative. SUMMARY OF THE INVENTION 100141 An aspect of the present invention provides a structure for use in an anastomosis procedure comprising: at least a first ring of a first material, the first ring having an inner circumference defining an aperture for receiving a shaft of a circular surgical anastomosis device, the first ring comprises at least one gap formed therein; and a second ring of a second material, the first ring being attached to the second ring, the second ring extending radially outward from the first ring, the first ring and the second ring being co-planar, the first material being different from the second material, the second material including a material impregnated with at least one of an adhesive, a sealant, and a medicament. [0014a] The present disclosure provides structures and/or gaskets for deposition between adjacent intestinal sections in an anastomosis procedure. The structure possesses at least an inner ring of a first material, and a middle ring of a second material. The first material and the second material include a wound treatment material consisting of at least one of an adhesive, a sealant and/or a medicament. The first material is different from the second material. [00151 The annular structure may be impregnated with the wound treatment material. Desirably, the annular structure is a mesh-like material. It is envisioned that the annular structure may be bio-absorbable. [00161 In one embodiment, the structure further includes an outer ring, wherein the outer ring of the structure includes at least one monomer selected form the group consisting of glycolide, glycolic acid, lactide, lactic acid, p-dioxanone, e-caprolactone, trimethylene carbonate, homopolymers thereof, copolymers thereof, and blends thereof. It is envisioned that the structure further includes an outer ring, wherein the outer ring of the structure includes a knotted mesh of polyglycolic acid yarns in combination with a second material selected from the group consisting of glycolide, lactide, trimethylene carbonate, dioxanone, and combinations thereof.
[00171 In another embodiment, the middle ring of the structure includes at least one monomer selected from the group consisting of glycolide, glycolic acid, lactide, lactic acid, p-dioxanone, e-caprolactone, trimethylene carbonate, homopolymers thereof, copolymers thereof, and blends thereof. [0018] In yet another embodiment, wherein the inner ring includes at least one monomer selected from the group consisting of glycolide, glycolic acid, lactide, lactic acid, p-dioxanone, e-caprolactone, trimethylene carbonate, homopolymers thereof, copolymers thereof, and blends thereof. [0019] In an embodiment, the structure may be non-absorbable. It is envisioned that the outer ring of the structure may include at least one non-absorbable material selected from the group consisting of polybuther, polyetherester, polyethylene, polypropylene, nylon, polyethylene terephthalate, polytetrafluoroethylene, polyvinylidene fluoride, stainless steel, and titanium. It is further envisioned that the middle ring of the structure may include at least one non-absorbable material selected from the group consisting of polyethylene, polypropylene, nylon, polyethylene terephthalate, polytetrafluoroethylene, polyvinylidene fluoride, stainless steel, and titanium. It is still further envisioned that the inner ring of the structure may include at least one non-absorbable material selected from the group consisting of polyolefins, nylon, and silk. [0020] In an embodiment, the structure further includes an outer ring including a composite of both non-absorbable and absorbable materials. It is envisioned that the middle ring of the structure may include a composite of both non-absorbable and 6 absorbable materials. It is further envisioned that the inner ring of the structure includes a composite of both non-absorbable and absorbable materials. [0021] In one embodiment, the inner ring of the structure includes at least one gap formed along a length thereof. [0022] The wound treatment material may include at least one adhesive including a hydrogel. The wound treatment material may include at least one sealant selected from the group consisting of fibrin sealants, collagen-based sealants, and synthetic polyethylene glycol-based, hydrogel sealants. It is envisioned that the wound treatment material may include at least one medicament selected from the group consisting of antimicrobials, analgesics, antipyretics, anesthetics, antiepileptics, antihistamines, anti inflammatories, cardiovascular drugs, diagnostic agents, sympathomimetics, cholinomimetics, antimuscarinics, antispasmodics, hormones, growth factors, muscle relaxants, adrenergic neuron blockers, antineoplastics, immunogenic agents, immunosuppressants, gastrointestinal drugs, diuretics, steroids, lipids, lipopolysaccharides, polysaccharides, enzymes, and combinations thereof. [00231 In an embodiment, the structure may include a first layer and a second layer. It is envisioned that the first layer of the structure includes a first part of a two-part wound treatment material, and the second layer of the structure includes a second part of the two-part wound treatment material. [00241 The inner ring may include a non-bioabsorbable material and the middle ring may include a bioabsorbable material. 7 100251 The present disclosure also provides methods for disposing a structure between adjacent intestinal sections. This method involves first providing a circular surgical anastomosis device. The circular surgical anastomosis device possesses an anvil assembly having an anvil member and a first shaft, a tubular body portion having an annular knife operatively disposed therein, and a second shaft disposed radially inward of the annular knife, the first shaft of the anvil assembly being selectively attachable to the second shaft of the tubular body. In carrying out the method of the present disclosure, the anvil assembly is inserted into a first intestinal section, the tubular body portion is inserted into a second intestinal section, and the structure including at least an inner ring and a middle ring is disposed between the first intestinal section and the second intestinal section. The anvil assembly and tubular body portion are then approximated with one another so that the structure is disposed between the first intestinal section and the second intestinal section, and an end portion of the first intestinal section, the structure, and an end portion of the second intestinal section are disposed between the anvil member and the tubular body portion of the circular surgical anastomosis device. The surgical anastomosis device is then fired to sever the portions of the first and second intestinal sections disposed radially inward of the annular knife, and portions of the first and second intestinal sections are placed in contact radially outward of the annular knife against the structure. [00261 The method may further include the step of attaching the first shaft of the anvil assembly to the second shaft of the tubular body portion prior to the step of approximating the anvil assembly to the tubular body portion. According to the method, the structure may include an aperture formed therein. Accordingly, the ifiethod may 8 further include the step of inserting one of the first shaft of the anvil assembly and the second shaft of the tubular body portion into the aperture of the structure prior to the step of attaching the first shaft of the anvil assembly to the second shaft of the tubular body portion. [0027] It is envisioned that the structure may be bio-absorbable or non absorbable. Desirably, the structure includes a composite of at least one bio-absorbable material in combination with at least one non-absorbable material. It is envisioned that the structure may be a mesh-like material. [0028] It is envisioned that the tubular body portion may carry a plurality of surgical staples in a circular configuration. The surgical staples are disposed radially outward of the annular knife, wherein upon firing of the anastomosis device, the plurality of staples penetrate a first interstitial section, the structure and then a second interstitial section. The step of firing the surgical anastomosis device desirably includes driving the plurality of staples from the tubular body portion through the second intestinal section, through the structure, through the first intestinal section, and against the anvil member. [00291 It is envisioned that the structure may include a first layer and a second layer. Desirably, the first layer of the structure includes a first part of a two-part wound treatment material, and the second layer of the structure includes a second part of the two-part wound treatment material. [0030] The structure may include a first part of a two-part wound treatment material, and the method may further include the step of applying a second part of the two-part wound treatment material to the structure. 9 [00311 The structure may include a first part of a two-part adhesive, and wherein the step of deploying the adhesive material includes applying a second part of the two part adhesive to the support structure prior to the step of approximating. [0032] It is envisioned that the middle ring includes the bio-absorbable material and the inner ring includes the non-bio-absorbable material. The annular knife may then sever the non-absorbable material from the bio-absorbable material. The knife may sever the structure so that a portion of the non-absorbable material remains between the first and second intestinal sections. [0033] It is envisioned that the non-absorbable material may be arranged so as to be passed from the body upon at least partial absorption of the bio-absorbable material. BRIEF DESCRIPTION OF DRAWINGS 10034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure, wherein: [0035] FIG. I is a perspective view of an exemplary annular surgical stapling device; [0036] FIG. 2 is a perspective view of a circular anastomosis structure in accordance with an embodiment of the present disclosure, for use with the annular surgical stapling device of FIG. 1; 10 [0037] FIG. 2A is a cross-sectional view of the circular anastomosis structure of FIG. 2, as taken through 2A-2A of FIG. 2; [0038] FIG. 3 is a top view of a circular anastomosis structure in accordance with another embodiment of the present disclosure, for use with the annular surgical stapling device of FIG. 1; [0039] FIG. 4 is a cross-sectional view of a circular anastomosis structure in accordance with an alternate embodiment of the present disclosure, as taken through 3-3 of FIG. 2, for use with the annular surgical stapling device of FIG. 1; [0040] FIG. 5 is a perspective view of a circular anastomosis structure in accordance with another embodiment of the present disclosure, for use with the annular surgical stapling device of FIG. 1; [0041] FIG. 6 is a side elevational view of the circular anastomosis structure of FIG. 5, illustrated in position on the annular surgical stapling device of FIG. 1; [0042] FIG. 7 is a perspective view of the intestinal area of a patient, illustrating a method of positioning the circular anastomosis structure of FIGS. 2, 3 and 4 on the anvil rod of the annular stapling device of FIG. 1; and [0043] FIG. 8 is a schematic perspective view of the intestinal area of FIG. 7, illustrating the anvil rod mounted to the annular stapling device and having the circular anastomosis structure of FIGS. 2, 3 and 4 disposed therebetween. 11 DETAILED DESCRIPTION OF EMBODIMENTS [00441 Embodiments of the presently disclosed circular anastomosis structures, also referred to herein as circular anastomosis gaskets, will now be described in detail with reference to the drawing figures wherein like reference numerals identify similar or identical elements. As used herein and as is traditional, the term "distal" refers to that portion which is furthest from the user while the term "proximal" refers to that portion which is closest to the user. [0045] Referring initially to FIG. 1, an annular surgical stapling device, for use with the circular anastomosis structures disclosed herein, is generally designated as 10. Surgical stapling device 10 includes a handle assembly 12 having at least one pivotable actuating handle member 14, and an advancing member 16. Extending from handle member 12, there is provided a tubular body portion 20 which may be constructed so as to have a curved shape along its length. Body portion 20 terminates in a staple cartridge assembly 22 which includes a pair of annular arrays of staple receiving slots 36 having a staple (not shown) disposed in each one of staple receiving slots 36. Positioned distally of staple cartridge assembly 22 there is provided an anvil assembly 30 including an anvil member 26 and a shaft 28 operatively associated therewith for removably connecting anvil assembly 30 to a distal end portion of stapling device 10. 10046] Staple cartridge assembly 22 may be fixedly connected to the distal end of tubular body portion 20 or may be configured to concentrically fit within the distal end of tubular body portion 20. Typically, staple cartridge assembly 22 includes a staple pusher (not shown) including a proximal portion having a generally frusto-conical shape and a 12 distal portion defining two concentric rings of peripherally spaced fingers (not shown), each one of which is received within a respective staple receiving slot 36. [00471 Typically, a knife (not shown), substantially in the form of an open cup with the rim thereof defining a knife edge, is disposed within staple cartridge assembly 22 and mounted to a distal surface of a staple pusher (not shown). The knife edge is disposed radially inward of the pair of annular arrays of staples. Accordingly, in use, as the staple pusher is advanced, the knife is also advanced axially outward. [0048] Reference may be made to U.S. Patent No. 5,915,616 to Viola et al., the entire contents of which are incorporated herein by reference, for a detailed discussion of annular stapling device 10. [0049] Turning now to FIGS. 2 and 3, an anastomosis structure, in accordance with an embodiment of the present disclosure, is generally designated as structure 100. Structure 100 includes an inner ring 102, a middle ring 1.04, and an outer ring 106. A substantially centrally located aperture 108, defined by the inner circumference of inner ring 102 is formed through structure 100. [00501 In one embodiment, structure 100 is sized such that when structure 100 is operatively associated with stapling device 10, as will be described in greater detail below, outer ring 106 extends radially beyond staple retaining pockets 36 (see FIG. 1) of staple cartridge assembly 22. Additionally, aperture 108 of structure 100 is sized to at least receive shaft 28 of anvil assembly 30 therethrough. In another embodiment, the distance between outer ring 106 and inner ring 102 is substantially equal to a width of a tissue contacting surface 24 (see FIG. 1) of staple cartridge assembly 22. 13 [0051] As seen in FIG. 3, circular anastomosis structure 100 includes at least two concentric rings. Where a three ring structure is utilized, as shown in FIGS. 2 and 3, structure 100 includes an inner ring 102, a middle ring 104 and an outer ring 106. Where a two ring structure is utilized (not shown), structure 100 includes a middle ring 104 and an outer ring 106. In this embodiment, inner ring 102 is missing and/or is otherwise optional. [0052] It is contemplated that inner ring 102 may, in some embodiments, be made from non-absorbable materials including, but not limited to, both synthetic and natural materials, including polyolefins such as polypropylenes, nylon, and silk. Inner ring 102 may also be made of absorbable materials, including homopolymers, copolymers or blends obtained from one or more monomers selected from the group consisting of glycolide, glycolic acid, lactide, lactic acid, p-dioxanone, e-caprolactone and trimethylene carbonate. In some embodiments, inner ring 102 may be a composite of both non absorbable and absorbable materials. [0053] As seen in FIG. 3, in one embodiment the inner ring may 102 have one or more gaps 114 formed therein and/or therealong to help facilitate passage of inner ring 108 out of the patients' body and to help facilitate introduction of shaft 28 of anvil assembly 30 into aperture 108. [0054] It is contemplated that middle ring 104 of structure 100 may be fabricated from or include a surgical grade, biocompatible, non-absorbable (i.e., permanent) or absorbable (i.e., non-permanent) mesh or material desirably impregnated with an adhesive, sealant and/or other medicament. As used herein, "mesh" includes woven, 14 knitted and braided materials. In addition, non-woven materials such as felts may be used. For example, middle ring 104 may be fabricated from "TEFLON", which is a registered trademark owned by DuPont de Nemours & Co. It is further contemplated that middle ring 104 may be fabricated from a biocompatible polymeric foam, felt, polytetrafluoroethylene (ePTFE), gelatin, fabric or the like, or any other biocompatible material. [00551 Non-absorbable materials used for middle ring 104 include, but are not limited to, those that are fabricated from such polymers as polybutester, polyetherester, polyethylene, polypropylene, nylon, polyethylene terephthalate, polytetrafluoroethylene, polyvinylidene fluoride, and the like. Further non-absorbable materials which may be utilized include, but are not limited to, stainless steel, titanium and the like. [0056] Bio-absorbable materials used for middle ring 104 of structure 100 include, but are not limited to, those fabricated from homopolymers, copolymers or blends obtained from one or more monomers selected from the group consisting of glycolide, glycolic acid, lactide, lactic acid, p-dioxanone, e-caprolactone and trimethylene carbonate. Other bio-absorbable materials include, but are not limited to, polyglycolic acid (PGA) and polylactic acid (PLA). In one embodiment, middle ring 104 may be fabricated from bio-absorbable felt, ePTFE, gelatin or any other bio-absorbable materials. In one particularly useful embodiment, polyglycolic acid (PGA) yarns may be used as the middle ring 104 of the circular anastomosis structure of the present disclosure. Suitable yarns include those sold in a mesh form as DEXONTM mesh by United States Surgical, a Division of Tyco Health-Care Group, LP, Norwalk, CT. 15 [00571 In one particularly useful embodiment, as seen in FIG. 2A, middle ring 104 may be made from a composite material made from a majority 110 of an absorbable yarn with a minority 112 of non-absorbable yarn, such as silk, cotton, nylon, polypropylene, polyester, polyethylene terephtialate, and the like. In some cases, it may be advantageous to include a minor portion of a non-absorbable yarn to increase tissue growth by enhancing tissue reactivity. While materials such as silk, cotton and nylon are classified by the FDA as non-absorbable materials, they will eventually break-down in the body, at a much slower rate than absorbable materials. 100581 As with inner ring 102, in some embodiments middle ring 104 may be a composite of both non-absorbable and absorbable materials. 100591 Outer ring 106 may similarly be made of non-absorbable or absorbable materials described above for use in forming middle ring 104 or inner ring 102. In some embodiments, outer ring 106 may also be made from a composite of absorbable materials combining a knitted mesh such as DEXONTM mesh with an absorbable synthetic wax or synthetic sealant. For example, this absorbable material can be made from short-chain polymer(s) such as glycolide, lactide, trimethylene carbonate, dioxanone or the like, and any combinations thereof. [00601 In a further embodiment, the structure has a middle ring and an inner ring and incorporates at least two different materials. The inner ring is formed from a non bioabsorbable material, whereas the middle ring is formed from bio-absorbable materials and is preferably a compressible material arranged to be compressed between adjacent tissue sections so as to form a seal. The inner ring is desirably arranged so as to be at 16 least partially removed by the circular knife of the stapling device and/or passed from the body. [0061] As noted above, in some embodiments a minor portion of a non absorbable material may also be incorporated into inner ring 102, outer ring 106, or both. [0062] In yet another embodiment, as seen in FIGS. 4 and 5, middle ring 104 can be made from a sandwich of composite materials including an upper layer 104a and a lower layer 104b. Desirably, layers 104a, 104b may be a knitted mesh made from both absorbable and non-absorbable yams and include a sealant as a middle layer to secure layers 104a, 104b to one another. Sealants which may be utilized to adhere the upper and lower layers 104a, 104b of the middle ring are known to those skilled in the art and include, but are not limited to, hydrogels, fibrin-based sealants, thrombin-based sealants, collagen-based sealants, and synthetic polymer sealants including those based on polyalkylene oxides such as polyethylene glycol, polydioxanones, polylactides, polyglycolides, polycaprolactones. In one particularly useful embodiment, the sealant utilized to adhere the upper and lower layers 104a, 104b of middle ring 104 is an absorbable sealant which swells after contact with water, e.g., a hydrogel, which is analogous to a "foam in place" sealant. [00631 In yet another embodiment, the multi-layer composite mesh utilized to form the middle ring 104 may be pre-impregnated (i.e., coated) with the swelling absorbable sealant. [00641 In one embodiment, middle ring 104 of structure 100 may be fabricated from a bio-absorbable material which is desirably impregnated with an adhesive, sealant, 17 and/or other medicament (i.e., wound treatment material). Accordingly, in use, the sealant component of structure 100 functions to retard any bleeding which may occur from the tissue, the adhesive component of structure 100 functions to help secure the approximated tissue together, and the bio-absorbability of structure 100 allows for at least a portion of structure 100 to be absorbed into the body after a predetermined amount of time. For example, structure 100 may remain in place in the body for approximately 2-3 weeks in order for the anastomosis to sufficiently heal prior to structure 100 being absorbed into the body. 10065] Where utilized, the adhesive should be a biocompatible adhesive including, but not limited to, adhesives which cure upon tissue contact, which cure upon exposure to ultraviolet (UV) light, which are two-part systems kept isolated from one another and cure upon coming into contact with one another, which are pressure sensitive, which are any combinations thereof, or any other known suitable adhesive. In one embodiment, it is contemplated that an adhesive having a cure time of from about 10 to about 15 seconds may be used. In another embodiment, it is contemplated that an adhesive having a cure time of about 30 seconds may be used. [0066] It is envisioned that middle ring 104 of structure 100 may be impregnated with a pre-cured adhesive or sealant. The pre-cured sealant or adhesive will react with the moisture and/or heat of the body tissue to thereby activate the sealing and/or adhesive properties of the sealant or adhesive. Thus, in one embodiment the pre-cured sealant or adhesive may be a hydrogel or the like. 18 [00671 It is envisioned that the adhesive may be utilized alone or combined with one or more other wound treatment materials. Other surgically biocompatible wound treatment materials which may be employed in or applied by surgical instruments, especially surgical staplers utilized to repair tissue and create anastomosis with the anastomosis composite structure herein, include adhesives whose function is to attach or hold organs, tissues or structures; sealants to prevent fluid leakage; hemostats to halt or prevent bleeding; and medicaments. [0068] Examples of additional adhesives which can be employed include protein derived, aldehyde-based adhesive materials, for example, the commercially available albumin/glutaraldehyde materials sold under the trade designation BioGlueM by Cryolife, Inc., and cyanoacrylate-based materials sold under the trade designations Indermil" and Derma BondTm by Tyco Healthcare Group, LP and Ethicon Endosurgery, Inc., respectively. Examples of sealants which can be employed include fibrin sealants and collagen-based and synthetic polymer-based tissue sealants. Examples of commercially available sealants are synthetic polyethylene glycol-based, hydrogel materials sold under the trade designation CoSealTm by Cohesion Technologies and Baxter International, Inc. [00691 Examples of hemostat materials which can be employed include fibrin based, collagen-based oxidized regenerated cellulose-based, and gelatin-based topical hemostats. Examples of commercially available hemostat materials are fibrinogen thrombin combination materials sold under the trade designations CoStasism by Tyco Healthcare Group, LP, and Tisseellm sold by Baxter International, Inc. Hemostats herein also include astringents, e.g., aluminum sulfate, and coagulants. 19 [00701 The term medicamentt", as used herein, is used in its broadest sense and includes any substance or mixture of substances that have clinical use. Consequently, medicaments may or may not have pharmacological activity per se, e.g., a dye. Alternatively a medicament could be any agent which provides a therapeutic or prophylactic effect, a compound that affects or participates in tissue growth, cell growth, cell differentiation, a compound that may be able to invoke a biological action such as an immune response, or could play any other role in one or more biological processes. [0071] Examples of classes of medicaments which may be utilized in accordance with the present disclosure include antimicrobials, analgesics, antipyretics, anesthetics, antiepileptics, antihistamines, anti-inflammatories, cardiovascular drugs, diagnostic agents, sympathomimetics, cholinomimetics, antimuscarinics, antispasmodics, hormones, growth factors, muscle relaxants, adrenergic neuron blockers, antineoplastics, immunogenic agents, immunosuppressants, gastrointestinal drugs, diuretics, steroids, lipids, lipopolysaccharides, polysaccharides, and enzymes. It is also intended that combinations of medicaments may be used. [0072] Suitable antimicrobial agents which may be included as a medicament in the circular anastomosis structure of the present disclosure include triclosan, also known as 2,4,4'-trichloro-2'-hydroxydipheny ether, chlorhexidine and its salts, including chlorhexidine acetate, chlorhexidine gluconate, chlorhexidine hydrochloride, and chlorhexidine sulfate, silver and its salts, including silver acetate, silver benzoate, silver carbonate, silver citrate, silver iodate, silver iodide, silver lactate, silver laurate, silver nitrate, silver oxide, silver palmitate, silver protein, and silver sulfadiazine, polymyxin, tetracycline, aminoglycosides, such as tobramycin and gentamicin, rifampicin, bacitracin, 20 neomycin, chloramphenicol, miconazole, quinolones such as oxolinic acid, norfloxacin, nalidixic acid, pefloxacin, enoxacin and ciprofloxacin, penicillins such as oxacillin and pipracil, nonoxynol 9, fusidic acid, cephalosporins, and combinations thereof. In addition, antimicrobial proteins and peptides such as bovine lactoferrin and lactoferricin B may be included as a medicament in the circular anastomosis structure of the present disclosure. 100731 Other medicaments which may be included in the circular anastomosis structure of the present disclosure include: local anesthetics; non-steroidal antifertility agents; parasympathomimetic agents; psychotherapeutic agents; tranquilizers; sedative hypnotics; steroids; sulfonamides; sympathomimetic agents; vaccines; vitamins; antimalarials; anti-migraine agents; anti-parkinson agents such as L-dopa; anti spasmodics; anticholinergic agents (e.g. oxybutynin); bronchodilators; cardiovascular agents such as coronary vasodilators and nitroglycerin; alkaloids; analgesics; narcotics such as codeine, dihydrocodeinone, meperidine, morphine and the like; non-narcotics such as salicylates, aspirin, acetaminophen, d-propoxyphene and the like; opioid receptor antagonists, such as naltrexone and naloxone; anti-cancer agents; anti-convulsants; anti emetics; antihistamines; anti-inflammatory agents such as hormonal agents, hydrocortisone, prednisolone, prednisone, non-hormonal agents, allopurinol, indomethacin, phenylbutazone and the like; prostaglandins and cytotoxic drugs; estrogens; antibacterials; antibiotics; anti-fungals; anti-virals; anticoagulants; anticonvulsants; antidepressants; antihistamines; and immunological agents. [0074] Other examples of suitable medicaments which may be included in the circular anastomosis structure of the present disclosure include viruses and cells, 21 peptides, polypeptides and proteins, analogs, muteins, and active fragments thereof, such as immunoglobulins, antibodies, cytokines (e.g. lymphokines, monokines, chemokines), blood clotting factors, hemopoietic factors, interleukins (IL-2, IL-3, IL-4, IL-6), interferons (B-IFN, (a-IFN and ?-IFN), erythropoietin, nucleases, tumor necrosis factor, colony stimulating factors (e.g., GCSF, GM-CSF, MCSF), insulin, anti-tumor agents and tumor suppressors, blood proteins, gonadotropins (e.g., FSH, LH, CG, etc.), hormones and hormone analogs (e.g., growth hormone), vaccines (e.g., tumoral, bacterial and viral antigens); somatostatin; antigens; blood coagulation factors; growth factors (e.g., nerve growth factor, insulin-like growth factor); protein inhibitors, protein antagonists, and protein agonists; nucleic acids, such as antisense molecules, DNA and RNA; oligonucleotides; and ribozymes. [00751 A single medicament may be utilized in the circular anastomosis structure of the present disclosure or, in alternate embodiments, any combination of medicaments may be utilized in the circular anastomosis structure of the present disclosure. [00761 The medicament may be disposed on a surface of structure 100 or impregnated into structure 100. The medicament may include one or more medically and/or surgically useful substances such as drugs, enzymes, growth factors, peptides, proteins, dyes, diagnostic agents or hemostatic agents, or any other pharmaceutical used in the prevention of stenosis. [00771 In one embodiment, it is contemplated that middle ring 104 of structure 100 may be impregnated with a first component of a two-part adhesive and that the staples, retained in staple receiving slots 36 of staple cartridge assembly 22, may be 22 coated with a second component (e.g., a reactant) of the two-part adhesive. In this manner, the first component of the adhesive is activated when the staples penetrate and capture middle ring 104 of structure 100 during the firing sequence of surgical stapling device 10, and the two components of the adhesive contact one another. [0078] As seen in FIG. 3, structure 100 may include a single layered middle ring 104 including a homogeneous array of bio-absorbable or non-absorbable materials or a heterogeneous array or bio-absorbable and/or non-absorbable materials. [00791 As seen in FIGS. 4 and 5 and as discussed above, structure 100 may include at least a dual layered middle ring 104 as indicated by first layer, film or wafer 104a and second layer, film or wafer 104b. In this embodiment, each layer 104a, 104b may include a homogeneous or heterogeneous array of bio-absorbable and/or non absorbable materials. It is envisioned that each layer 104a, 104b may be separated from one another, as seen in FIG. 5, prior to the surgical procedure. [0080] As will be described in greater detail below, first layer 104a of structure 100 may be placed against a surface of a first tissue to be anastomosed, in juxtaposition to a second tissue to be anastomosed, and second layer 104b of structure 100 may be placed against a surface of the second tissue to be anastomosed, in juxtaposition to the first tissue to be anastomosed. In this manner, as the first and second tissues are brought into contact with one another, first and second layers 104a, 104b of structure 100 are brought into contact with one another and allowed to mix and/or react. For example, first layer 104a of structure 100 may include a first component of a two-part adhesive or sealant while second layer 104b of structure 100 may include a second component of the 23 two-part adhesive or sealant. Accordingly, in use, when first layer 104a and second layer 104b come into contact with one another, the first and second components of the two-part adhesive or sealant will also come into contact and mix thereby forming the adhesive or sealant. [0081] First and second layers 104a and 104b may be fabricated as bio absorbable film-like membranes which activate upon contact with one another and/or contact with a fluid (e.g., water, saline, blood, an activating fluid, etc.). It is envisioned that a break-away or tear-away divider or barrier (not shown) may be positioned between first and second layers 104a, 104b in order to prevent accidental and/or premature contact between first and second layers 104a and 104b. It is further envisioned that each first and second layer 104a and 104b may include a liner (not shown) removably disposed on at least one of a top or bottom surface thereof. In any of these embodiments, prior to contact of first and second layers 104a and 104b with one another, the divider and/or liners must be removed in order for activation of the adhesive to occur. [00821 It is further envisioned that middle ring 104 of structure100 may be impregnated with a pressure sensitive adhesive which is activated when the adjacent layers of tissue are approximated. Suitable pressure sensitive adhesives are known to those skilled in the art and include, for example, acrylate polymers, methacrylate polymers. In some embodiments, the pressure sensitive adhesive may be an alkyl methacrylate including, but not limited to, alkyl methacrylates containing 1 to about 10 carbon atoms in the alkyl group. Representative examples of suitable alkyl methacrylates include methyl methacrylate, n-butyl methacrylate, n-pentyl methacrylate, n-hexyl methacrylate, isoheptyl methacrylate, cyclohexyl methacrylate, n-nonyl methacrylate, n 24 decyl methacrylate, isohexyl methacrylate, 2-ethyloctyl methacrylate, isooctyl methacrylate, isobornyl methacrylate, 2-ethylhexyl methacrylate, and mixtures and combinations of the foregoing. Typically, the alkyl methacrylate may be isooctyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, isobornyl methacrylate, and/or methyl methacrylate. [00831 In some embodiments, the pressure sensitive adhesive may be a copolymer including an alkyl methacrylate described above copolymerized with one or more methacrylate monomers having at least one functional group selected from the grouping consisting of carboxylic acid, carboxylic acid ester, hydroxyl, anydride, epoxy, thiol, isocyanate, sulfonamide, urea, carbamate, carboxamide, amine, ammonium, oxy, oxo, nitro, nitrogen, sulfur, phosphate, phosponate, cyano, combinations of these, and the like. Representative examples of specific materials that can be used singly or in combination as the methacrylate monomer having at least one functional group include methacrylic acid, maleic acid, vinyl acetate, a hydroxyalkyl methacrylate containing about 2 to about 4 carbon atoms in the hydroxyalkyl group, methacrylamide, an alkyl substituted methacrylamide having 1 to about 8 carbon atoms in the alkyl group, diacetone methacrylamide, a dialkyl methacrylamide independently having 1 or 2 carbon atoms in each alkyl group, N-vinyl-N-methyl acetamide, N-vinyl lactams, N-vinyl valerolactam, N-vinyl caprolactam, N-vinyl-2-pyrrolidone, glycidyl methacrylate, alkoxy methacrylate containing 1 to 4 carbon atoms in the alkoxy group, 2-ethoxyethyl methacrylate, 2,2-ethoxyethoxyethyl methacrylate, furfuryl methacrylate, tetrahydrofurfuryl methacrylate, propylene glycol monomethacrylate, polyethylene glycol methacrylate, polyethylene glycol methyl ether methacrylate, polyethylene oxide methyl 25 ether methacrylate, di(lower)alkylaminopropyl methacrylamide (wherein lower means the alkyl moiety has 1 to 4 carbon atoms), methacrylonitrile, combinations of these, and the like. Typically, the copolymerizable monomer having at least one functional group include may be hydroxyethyl acrylate, hydroxyethyl methacrylate, acrylamide, glyceryl acrylate, N,N-dimethyl acrylamide, 2-ethoxyethyl acrylate, 2,2-ethoxyethoxyethyl acrylate, tetrahydrofurfuryl acrylate, vinyl acetate, and/or acrylic acid. Any of the aforementioned alkyl groups may be linear, branched or cyclic. [0084] As seen in FIG. 6, in use structure 100 may be placed such that aperture 108 receives shaft 28 of anvil assembly 30 therethrough and is at least substantially axially aligned with staple receiving slots 36 (see FIG. 1) of cartridge assembly 22. [0085] Turning now to FIGS. 7 and 8, there is illustrated the use of surgical stapling device 10 and detachable anvil assembly 30 in an anastomosis procedure to effect joining of intestinal sections 66 and 68. The anastomosis procedure is typically performed using minimally invasive surgical techniques including laparoscopic means and instrumentation. At the point in the procedure shown in FIG. 7, a diseased intestinal section has been previously removed, anvil assembly 30 has been applied to the operative site either through a surgical incision or transanally and positioned within intestinal section 68, and tubular body portion 20 of surgical stapling device 10 has been inserted transanally into intestinal section 66. Intestinal sections 66 and 68 are also shown temporarily secured about their respective components (e.g., shaft 28 of anvil assembly 30, and the distal end of tubular body portion 20) by conventional means such as a purse string suture "P" (see FIG. 8). 26 [00861 According to one method, as seen in FIG. 8, if desired or if the surgical procedure requires, circular anastomosis structure 100 may be placed onto shaft 28 of anvil assembly 30 prior to the coupling of anvil assembly 30 to the distal end of tubular body portion 20. Following positioning of structure 100 onto shaft 28 of anvil assembly 30, the surgeon maneuvers anvil assembly 30 until the proximal end of shaft 28 is inserted into the distal end of tubular body portion 20 of surgical stapling device 10, wherein the mounting structure (not shown) within the distal end of tubular body portion 20 engages shaft 28 to effect the mounting. [00871 Thereafter, anvil assembly 30 and tubular body portion 20 are approximated to approximate intestinal sections 66, 68 and capture circular anastomosis structure 100 therebetween. Surgical stapling device 10 is then fired thereby stapling intestinal sections 66, 68 to one another and cutting the portion of tissue and structure 100 disposed radially inward of the knife, to complete the anastomosis. Structure 100 may then release the adhesive impregnated therein to thereby adhere intestinal sections 66 and 68 to one another. [0088] In the event that a structure 100 having a first and second layer I 04a and 104b, each including one part of a two-part adhesive composition, is used, it is envisioned that first and second layers 104a and 104b are maintained separated and/or isolated from one another until approximation and firing of the surgical stapling device is to occur. Accordingly, in use, one of first and second layers 104a, 104b may be placed on shaft 28 of anvil assembly 30, against the surface of intestinal section 68, while the other of first and second layers 104a, 104b is placed against the surface of intestinal section 66. It is envisioned that pins (not shown) may extend distally from the distal end 27 of tubular body portion 20 and penetrate through intestinal section 66. In this manner, the other of first and second layers 104a, 104b may be pinned onto the pins extending through intestinal section 66. [0089] Alternatively, if a structure 100, having a first and second layer 104a and 104b, each including one part of a two-part adhesive composition, is used, it is envisioned that that each layer 104a, 104b may be provided with a tear-away or removable liner for maintaining first and second layers 104a, 104b separated and/or isolated from one another. Accordingly, both first and second layers 104a, 104b may be placed on shaft 28 of anvil assembly 30. 100901 If a structure 100, having a first and second layer 104a, 104b, each including one part of a two-part adhesive composition, is used, the adhesive composition may be activated upon first and second layers 104a, 104b coming into contact with one another. [0091] From the foregoing, it will be appreciated that the circular anastomosis structures of the present disclosure function to strengthen the anastomosis and reduce the occurrence of bleeding, leaking and stricture. It is also to be appreciated that the circular anastomosis structures of the present disclosure may be utilized in a number of other applications and is not limited solely to bowel or bronchus anastomosis. [0092] Each circular anastomosis structure described above is constructed to enhance the formation of an anastomosis at the target surgical site. In some embodiments, the circular anastomosis structure may also be used to deliver an adhesive to the surgical site. The amount of adhesive to be delivered is site specific. Accordingly, 28 different sized (e.g., different thickness or different volume) circular anastomosis structures are contemplated for retaining a different volume or quantity of adhesive therein. In this manner, depending on the particular need and the particular surgical procedure, the surgeon may select a circular anastomosis structure containing the needed and/or desired volume or quantity of adhesive therein. [00931 While several particular forms of the circular anastomosis structures have been illustrated and described, it will also be apparent that various modifications can be made without departing from the spirit and scope of the present disclosure. For example, it is envisioned and within the scope of the present disclosure for an ultraviolet light activated adhesive to be used in connection with any of the circular anastomosis structures described above. In use, either prior to or following firing of surgical stapling device 10, the circular anastomosis structure is irradiated with UV light to thereby activate the adhesive. [0094] It is further contemplated that each of the circular anastomosis structures described herein may be used with an annular surgical anastomosing device, not including any staples for securing tissue together, which is capable of approximating, adhering and cutting tissue. 100951 Thus, it should be understood that various changes in form, detail and application of the circular anastomosis structures of the present disclosure may be made without departing from the spirit and scope of the present disclosure. 29