US20050059997A1 - Circular stapler buttress - Google Patents

Circular stapler buttress Download PDF

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Publication number
US20050059997A1
US20050059997A1 US10666204 US66620403A US2005059997A1 US 20050059997 A1 US20050059997 A1 US 20050059997A1 US 10666204 US10666204 US 10666204 US 66620403 A US66620403 A US 66620403A US 2005059997 A1 US2005059997 A1 US 2005059997A1
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US
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Patent type
Prior art keywords
stapler
buttress
circular
device
reinforcement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10666204
Inventor
Ann Bauman
Stuart Broyles
Jerald Crawley
John Daugherty
Norman Pih
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Gore W L and Associates Inc
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Gore Enterprise Holdings Inc
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A61B17/07292Reinforcements for staple line, e.g. pledgets
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/11Surgical instruments, devices or methods, e.g. tourniquets for performing anastomosis; Buttons for anastomosis
    • A61B17/115Staplers for performing anastomosis in a single operation
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/072Surgical staplers, e.g. containing multiple staples or clamps for applying a row of staples in a single action, e.g. the staples being applied simultaneously
    • A61B2017/07214Stapler heads
    • A61B2017/07257Stapler heads characterised by its anvil

Abstract

A buttress for use with circular surgical staplers that does not require adhesive to securely fasten the buttress to the stapler and that self-aligns onto the stapler. Following cutting and stapling by the circular stapler, the buttress has an adaptive opening through its central region with a diameter smaller than the outer diameter of the stapler anvil. Because of relief features built into the buttress, the stapler anvil may be pulled through the buttress material without causing permanent alteration to the buttress. These relief features may be provided regardless of whether the buttress is made of inelastic or elastic materials. The buttress is generally circular in shape with an outer diameter sized to coincide with the outer diameter of the stapler body staple compression surface and the outer diameter of the anvil compression surface of a circular stapler with which it is used. Prior to surgical use, the buttress is provided with a generally circular hole in the central region that is sized to closely fit the central shaft of a circular stapler with which it is used.

Description

    FIELD OF THE INVENTION
  • [0001]
    The present invention relates to the field of surgical buttresses.
  • BACKGROUND OF THE INVENTION
  • [0002]
    A circular stapler is one device that can be used in surgical applications for the joining of body tissue. In the area of surgical anastomotic stapling, it can be used for joining pieces of tissue in a manner such that a continuous pathway, lumen, or surgical opening, is formed after the tissue is stapled together. This lumen is formed when a circle of staples is used to join two pieces of tissue after which the tissue interior to the innermost circle of staples is cut out by a concentric circular retractable blade. Retraction of the circular stapler removes the cut tissue to form a lumen. An example of a circular stapler is given in U.S. Pat. No. 5,104,025 to Main et al. Other devices and methods can also be used to produce anastomoses.
  • [0003]
    When used in surgery for colorectal disorders the circular stapler is used to reform the colon into a continuous lumen after a section is removed for treatment of the disease state. Concerns about leakage of the colon contents into the peritoneal cavity from the anastomosis site are prevalent during this type of surgery. A complete seal between the pieces of tissue that are joined is desirable to prevent leakage. Another concern in colon resections is reduction of the lumen diameter after surgery. This reduction in diameter would result in the restriction of the passage of biological material.
  • [0004]
    Using a stapler that forms a lumen with a diameter close to that of the preoperative healthy colon is desirable to prevent these flow restrictions. Typically the circle of staples formed is between 2-4 cm in diameter and is made from 20 to 40 small, metallic staples. Due in part to the presence of these metallic staples, another concern in tissue resection is tearing of the tissue at the anastomosis site.
  • [0005]
    Modifications to circular staplers as well as the development of other devices have been described to address the concerns that may occur during stapling of body tissue and the formation of a tissue anastomosis. A device used to create an anastomosis without staples is described in U.S. Pat. No. 5,222,963 to Brinkerhoff et al. and U.S. Pat. No. 5,250,058 to Miller et al. This device uses a tissue coupler made from a bioabsorbable polymer. A concern in using this device is the risk of tissue separation at the anastomosis site after the polymer has been absorbed by the body. A similar concern is shared for the device described in U.S. Pat. No. 5,346,501 to Regula et al., as it also uses only a bioabsorbable material for the formation of the anastomosis.
  • [0006]
    To alleviate the concern about tissue separation after the absorption of a bioabsorbable material, non-absorbable biocompatible metal staples can be used to form the anastomosis. However, leakage and/or tearing at the site where the tissue is joined are concerns when only metal staples are used. In order to prevent leakage or tearing, supporting buttresses constructed of both non-bioabsorbable and bioabsorbable materials for use with surgical staplers have been described in various publications. U.S. Pat. No. 6,503,257 to Grant et al. teaches a method for using an adhesive to releasably attach a buttress construct to a surgical stapling instrument. This buttress addresses both the leakage and tearing concerns that occur during tissue stapling. The use of metal staples provides for the long-term joining of the tissue. However, the buttress must be carefully aligned onto the stapling instrument and a suitable adhesive must be used on the surfaces of both the buttress and the stapling instrument to secure the buttress to the stapling instrument. Further, withdrawing the anvil part of the stapler through the buttress may be difficult, as the inner diameter of the buttress is smaller than the outer diameter of the stapler anvil.
  • SUMMARY OF THE INVENTION
  • [0007]
    The present invention is in the form of a buttress reinforcement device for use with circular surgical staplers that does not require an adhesive substance between the buttress and stapler to securely fasten the buttress to the stapler. Preferably, the buttress self aligns onto the stapler. In a preferred embodiment, when used with a circular surgical stapler, a hole is cut in the central region of the buttress by the stapler's circular cutting blade. The diameter of the hole formed in the buttress by the stapler's circular cutting blade is smaller than the outer diameter of the stapler's anvil. Relief features built into the buttress allow the stapler anvil to pull through the hole created in the buttress by the stapler's circular cutting blade without causing substantial permanent alteration to the buttress. These relief features can be provided regardless of whether the buttress is made of inelastic or elastic materials.
  • [0008]
    The buttress can be generally circular in shape with an outer diameter sized to coincide with the outer diameter of the stapler body staple compression surface and the outer diameter of the anvil compression surface of a circular stapler with which it is used. Alternatively, the buttress material may be formed into other non-circular geometric shapes (e.g. octagons). Also, the buttress material can be sized to be larger than or the same as the outer diameter of the stapler body staple compression surface and the outer diameter of the anvil compression surface of a circular stapler with which it is used in order to allow for self-alignment. This self-alignment insures that the buttress is aligned to coincide with and cover the pattern of staples ejected from the stapler. The buttress may have a generally circular opening in its central region that is sized to closely fit the central shaft of a circular stapler with which it is used. Alternatively, the buttress may have slits or other openings cut in its central region to allow for fitting the buttress onto the central shaft of a circular stapler while retaining the self-alignment feature. In a preferred embodiment, the central region of the buttress is that area which is cut away from the buttress by the action of the stapler cutting blade. In addition to the central opening, the buttress may have a slit or other opening reaching from the central opening to the outer diameter of the buttress. This feature would allow the buttress to be placed onto the central shaft of a circular stapler even when the stapler anvil was already attached to the stapler body through the central shaft.
  • [0009]
    In one embodiment, the buttress can have a retaining ring, disk, or similar device within or around its central region with a central opening. This retaining ring, disk, or similar device can be used to aid in the retention of the buttress onto the central shaft of the circular stapler without requiring the use of an adhesive substance between the central shaft of the stapler and the buttress construct. The retention of the buttress onto the circular stapler allows for movement, removal, or repositioning of the circular stapler during operation without loss or displacement of the buttress from the stapler.
  • [0010]
    A preferred bioabsorbable buttress is fabricated from a copolymer of poly(glycolide:trimethylene carbonate). The copolymer's polyglycolide component is commonly abbreviated as PGA for poly(glycolic acid), the chemical byproduct to which it degrades after hydrolysis. The poly(trimethylene carbonate) component is commonly abbreviated as TMC, with the copolymer itself typically referred to as PGA:TMC and accompanied with relative percentage composition by weight. A preferred embodiment of the buttress is made from a bioabsobable ABA triblock copolymer of 67% PGA:33% TMC (w/w), formed into a non-woven web as taught by Hayes in U.S. Pat. Nos. 6,165,217 and 6,309,423. Other fabrications, processes, and polymers can alternatively be used to produce an elastic bioabsorbable buttress, such as using the polymers described by Bezwada in U.S. Pat. Nos. 5,468,253 and 5,713,920. While the primary constituent polymer can be alternatively blended with other polymers or active or inactive agents prior to fabrication, the resulting buttress can be imbibed, coated, or otherwise loaded with therapeutic or other either bioactive or bioinactive materials.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0011]
    FIGS. 1A and 1B are perspective views of the bioabsorbable circular stapler buttresses mounted on a typical circular stapler and showing how the anvil portion of the circular stapler can be separated from the body of the stapler.
  • [0012]
    FIGS. 2A-2D are cross sectional views of colon undergoing resection using the buttresses of the present invention.
  • [0013]
    FIG. 2E is a perspective view of a longitudinal section of a colon undergoing resection using buttress of the present invention, that has been cut and stapled by a circular stapler.
  • [0014]
    FIGS. 3A-3F show top views of various embodiments of the buttress.
  • [0015]
    FIGS. 3G, 3H, 3J and 3K show perspective views of the buttress having various corrugations.
  • [0016]
    FIGS. 4A-4C show side views of three alternate embodiments of the buttress with varying thicknesses and densities.
  • [0017]
    FIGS. 5A-5E show top views of elastic and inelastic buttresses prior to and following central region cut out by the generally circular concentric cutting blade of a circular stapler and following removal of the anvil portion of a circular stapler through the central region hole.
  • [0018]
    FIG. 5G shows a cross sectional view of an inelastic buttress following removal of the anvil portion of a circular stapler though the hole created by the generally circular concentric cutting blade of a circular stapler.
  • [0019]
    FIG. 6A shows a perspective view of a buttress allowing for self-alignment on the central shaft of a circular stapler.
  • [0020]
    FIG. 6B shows a cross sectional view of a buttress allowing for self-alignment on the central shaft of a circular stapler.
  • [0021]
    FIG. 6C shows a perspective view of a buttress allowing for self-alignment on the outer diameter of a stapler anvil head or stapler body compression surface.
  • [0022]
    FIG. 6D shows a cross sectional view of a buttress allowing for self-alignment on the outer diameter of a stapler anvil head or stapler body compression surface.
  • DETAILED DESCRIPTION OF THE DRAWINGS
  • [0023]
    FIG. 1A is a perspective view of a typical circular surgical stapler 10 with two stapler buttresses 12 mounted on the central shaft 14 of the stapler. The stapler has an anvil head 16 with a staple compression surface 18. The anvil head 16 is removably attached to the stapler body 22 via the central shaft 14 as shown in FIG. 1B. The stapler body also has a compression surface 20 through which staples are ejected. The central openings 15 in the buttresses 12 are sized to closely fit over the central shaft 14 so that the buttresses self-align onto the shaft. The central openings 15 in the buttresses 12 may be generally circular, slits or of any other geometric shape. Because of the size and shape of the central openings 15, the buttresses 12 are self-aligned and concentric to the cutting mechanism and stapler compression surfaces of the circular stapler. Each buttress 12 further has a member 13 that aids in attaching the buttresses 12 to the central shaft 14 of the stapler without the use of adhesive substance between the central shaft 14 of the stapler and the buttresses 12. The buttresses 12 can be placed onto the central shaft 14 of the circular stapler 10 when the stapler anvil 16 is separated from the stapler body 22 as shown in FIG. 1B. Alternatively, a buttress 12 with a slit or other opening reaching from the central opening to the outer diameter of the buttress can be placed onto the central shaft 14 of a circular stapler 10 when the stapler anvil 16 is connected to the stapler body 22 as shown in FIG. 1A.
  • [0024]
    FIGS. 2A-2E show circular stapler buttresses 12 in use during, for example, a typical colon resection. FIG. 2A shows the stapler anvil head 16 and a buttress 12 placed inside the proximal end of a colon section 24, wherein proximal is defined as being closer to the heart of the patient being operated upon. An end of the central shaft 14 is protruding through a hole 29 formed in the colon tissue wall 25. The stapler body 22 and another buttress 12 are placed transanally inside a distal segment of the colon 26, wherein distal is defined as being farther from the heart of the patient being operated upon. Another end of the central tubular shaft 14 protrudes through a hole 31 formed in the distal colon tissue wall 27.
  • [0025]
    FIG. 2B shows the central shaft 14 with the anvil head 16 now joined to the stapler body 22. One buttress 12 is located between anvil compression surface 18 and the proximal colon tissue wall 25. Another buttress 12 is located between the body compression surface 20 and the distal colon tissue wall 27. The circular stapler 10 can be operated so as to pull the anvil head 16 towards the stapler body 22 so that the anvil head 16 and stapler body 22 are moved to within close opposition of each other.
  • [0026]
    FIG. 2C shows the anvil head 16 and stapler body 22 in close proximity to each other in a position where the staples can be ejected through the compression surface on the stapler body 20 to pierce through the opposing tissue walls of both the proximal 25 and distal 27 colon wall sections and also though the buttresses 12 placed internally within each colon section. The staples upon ejection are bent as they impact on the compression surface 18 of the anvil head 16 and compression surface 20 of the stapler body 22, to form a shape designed to tightly hold the colon sections together. The staples pierce through the colon tissue walls 25, 27 and the buttresses 12 that are placed internally on each side of the joined colon sections. FIG. 2C also shows a generally circular concentric cutting blade 33 which can be actuated by the stapler operator when the stapler anvil head 16 has been moved to a position of close opposition to the stapler body 22. The generally circular concentric cutting blade 33 in the circular stapler body 22 moves upon actuation by an operator from a retracted position to an extended position to cut through the opposing walls of both the proximal 25 and distal 27 colon sections as well as the buttresses 12 placed internally in each colon section after the staples have been positioned and ejected. The generally circular concentric cutting blade cuts through the tissue adjacent to the inner diameter of the innermost row of staples to allow a continuous lumen to form between the now-joined colon sections. Therefore an anastomotic junction is created in the body tissue. After the anastomotic junction has been formed, the stapler is operated so that the stapler anvil head 16 is moved away from the staple body 22 to release the tissue compressed between the compression surfaces of the anvil head 18 and stapler body 20. The circular stapler 10 is withdrawn transanally carrying with it the sections of colon tissue and central regions of the buttresses 12, which were cut by the generally circular stapler blade.
  • [0027]
    FIGS. 2D and 2E show the proximal 24 and distal 26 colon sections now joined together. The staples 35, which are located circumferentially around the colon tissue, are held securely in place by means of the colon tissue walls, 25, 27 which have been reinforced with the buttresses 12. The buttresses 12 provide circumferential support to the anastomotic junction in addition to enhancing sealing between the staples and tissue. These buttresses 12 may therefore augment resistance to radial distension at the anastomotic junction.
  • [0028]
    The above description relates to use of the buttresses 12 of the present invention in forming a tissue anastomosis in a colon resection. It is anticipated that buttresses of this design could be used for other gastro-intestinal applications, vascular applications and other applications in the human or animal body. Additionally, the above description describes the buttresses 12 both being placed internally within the colon segments. In an alternative use, a buttress 12 could be placed external to the colon segments. Further, buttresses 12 could be placed internally within each colon segment while another buttress could be placed externally between the colon segments. In another use, one buttress could be placed internally within one colon segment while another buttress could be placed externally between the colon segments. The number of buttresses 12 used and placement of the buttresses 12 in and around the relevant tissue sections is left to the surgeon.
  • [0029]
    The buttress 12 of the present invention may be fabricated from either bioabsorbable or non-absorbable biocompatible materials. A preferred embodiment for the buttress of the present invention is a bioabsorbable ABA triblock copolymer of 67% PGA:33%TMC (w/w) formed into a self-cohering non-woven web as generally taught by Hayes in U.S. Pat. Nos. 6,165,217 and 6,309,423. Alternatively, this web or other buttress constructs may be fabricated from other biocompatible bioabsorbable polymers and copolymers composed from varying amounts of one or more of the following monomer examples: glycolide, d,l-lactide, I-lactide, d-lactide, p-dioxanone (1,4-dioxane-2-one), trimethylene carbonate (1,3-dioxane-2-one), ε-caprolactone, gamma.-butyrolactone, delta.-valerolactone, 1,4-dioxepan-2-one, and 1,5-dioxepan-2-one. Other polymeric constituents of a bioabsorbable copolymer may include polyethylene glycol, polypropylene glycol, amino acids, anhydrides, orthoesters, phosphazines, amides, urethanes, and phosphoesters. Alternative copolymers may possess, in whole or in part, block, segmented, random, alternating, or statistical polymeric construction characteristics. Animal derived products such as elastin, collagen or decellularized submucosa, either absorbable (e.g. enzymatically degraded within the body) or rendered non-absorbable through chemical treatment (e.g., glutaraldehyde cross-linked bovine pericardium or porcine pericardium), may alternatively be utilized to provide a buttress construct. Various non-absorbable polymers may be utilized for buttress construction include but are not limited to polytetrafluoroethylene, fluorinated ethylene propylene (FEP), fluoroelastomers, polyurethanes, polyesters (e.g. polyethylene terephthalate), polyacrylamide, polyacetate, polypropylene, polydimethylsiloxane, and nylon. Of these, porous expanded polytetrafluoroethylene (ePTFE), generally made as taught by U.S. Pat. No. 3,953,566 to Gore, may provide a preferred non-absorbable buttress.
  • [0030]
    A preferred method of forming the buttress 12 using a bioabsorbable material is using a piece of 67%/33% PGA:TMC (w/w) that has been formed into a self-cohering non woven web into a thickness of approximately 0.25 mm following methods as generally taught by Hayes in U.S. Pat. Nos. 6,165,217 and 6,309,423. This piece of self-cohering non woven web is cut, for example, by a laser into a generally circular shape with an outer diameter made to coincide with the compression surface outer diameters for the anvil 18 and body 20 of a particular circular stapler. A variety of other cutting methods, such as die cutting, can be alternatively used. Due to the porous construction of the self-cohering non-woven web, various bioactive agents and carrier materials can be introduced into the porous interfiber interstices of the web or coated onto the fiber strands. Bioactive agents in this context refers to growth factors, chemotactic factors, morphogens, pharmaceuticals or drugs, catalysts, proteins, peptides or other biologically active molecules or genetically altered or native state living cells of autogenic, allogenic, xenogenic or recombinant origin that induce an intended biological response. Such substances include, but are not limited to antibiotics, organic or inorganic antimicrobials, healing factors, blood clotting agents, anticoagulants, antithrombotics, antispasmodics, immunosuppressives, antacids, acid inhibitors, and ulcer treating agents. Other fillers can include radiopaque substances to enhance visualization. Bioactive agents and fillers could be used with other porous and non-porous constructions for other bioabsorbable as well as non-absorbable materials.
  • [0031]
    FIGS. 3A-3E show top views of buttresses 12 with various relief features cut into them. These relief features form “adaptive openings” in the reinforcement material. These “adaptive openings” allow a larger diameter anvil 16 of a circular surgical stapler 10 to be pulled through the smaller diameter opening created by the cutting blade of the circular stapler without causing substantial permanent alteration to the reinforcement material. The relief features are preferably formed by laser cutting, although they could be made by a variety of other methods such as by use of a cutting die. The relief features are sized and placed so that some part of them remain on the portion of the buttress 12 that remains in the patient after the cutting action of the blade of a circular stapler. As will be further described, an adaptive opening may also be provided by making the perimeter of the adaptive opening corrugated, thereby providing extra material along the perimeter and accordingly increasing its flexibility in order to allow the stapler anvil to be withdrawn through the adaptive opening.
  • [0032]
    FIG. 3A shows the top view of a buttress 12 with twelve equally spaced linear radial cuts 32 emanating from the area of a central opening 30.
  • [0033]
    FIG. 3B shows the top view of a buttress 12 with four equally spaced linear cuts or slits 34 in a radial spoke type pattern emanating from the area of a central opening 30.
  • [0034]
    FIG. 3C shows the top view of a buttress 12 with four equally spaced linear cuts or slits 34 surrounding a central opening 30 as in FIG. 3B but with the addition of four radial cuts or slits 36 originating from the perimeter of the buttress 12.
  • [0035]
    FIG. 3D demonstrates that the relief features can be other than straight lines. FIG. 3D shows the top view of a buttress 12 that has serpentine shaped relief features 48 emanating from the area of a central opening 30.
  • [0036]
    FIG. 3E demonstrates that other geometric figures could provide similar function to the operation of the buttress, showing the top view of a buttress 12 with a series of generally triangular shapes 40 that are arranged radially around a central opening 30. The bases of the triangular shapes 42 are placed to coincide with the outside diameter of the generally circular concentric cutting blade of the selected circular stapler.
  • [0037]
    FIG. 3F shows a top view of a buttress 12 having a slit 51 through the entire width. It is apparent that, in addition to providing for an adaptive opening, the slit 51 allows the buttress 12 to be fitted over the central shaft 14 of the stapler without necessitating the prior removal of the anvil 16 from the stapler body 22.
  • [0038]
    FIG. 3G is a perspective view of a buttress 12 showing an embodiment wherein the adaptive opening results from corrugations 54. FIG. 3G has an inner edge 50 and an outer edge 52 with corrugations 54 that are formed between the inner and outer edges 50, 52. These corrugations may be made, for example, by transversely cutting a short segment from a length of tubular material, and deforming the resulting ring-shaped segment by bending one edge inwardly to cause the inner hole whereby the extra material results in corrugations. Alternatively, a mold could be used to form the corrugations.
  • [0039]
    FIG. 3H is a perspective view of a buttress 12 showing an embodiment wherein the adaptive opening results from corrugations 54. FIG. 3H has an inner edge 50 and an outer edge 52 with corrugations 54 that are present at the outer edge 52 but not at the inner edge 50. In an alternate embodiment, the corrugations could be formed at the inner edge 50, but not at the outer edge 52.
  • [0040]
    FIG. 3J is a perspective view of a buttress 12 showing an embodiment wherein the adaptive opening results from corrugations 54. FIG. 3J has a central non-corrugated or planar region 56 with a corrugated area from the outer perimeter of the corrugated or planar region 58 to the outer edge of the buttress 52.
  • [0041]
    FIG. 3K is a perspective view of a buttress 12 showing an embodiment wherein the adaptive opening results from corrugations 54 of the inner region of the buttress. FIG. 3K has an outer non-corrugated or planar region 78 that surrounds the central region having corrugations 54.
  • [0042]
    In each of the buttresses depicted in FIGS. 3G, 3H, 3J, and 3K, the adaptive opening resulting from corrugations 54 are sized and placed so that some part of the adaptive opening remains on the portion of the buttress 12 that remains in the patient after the cutting action of the blade of a circular stapler.
  • [0043]
    It is anticipated that designs other than those depicted in FIGS. 3A-3H, 3J and 3K may be used for the relief features on the buttresses 12. These various relief features allow for the anvil head 16 of a circular stapler 10 to pass through a buttress 12 without tearing or substantially altering the buttress 12, even though the anvil head 16 compression surface 18 has an outer diameter larger than the inner diameter of the hole formed in the buttress 12 when a generally circular, concentric cutting blade of the circular stapler 10 has been used to cut the hole in the buttress 12.
  • [0044]
    Self alignment of the buttress 12 onto a circular surgical stapler is another important aspect of this invention. Self alignment insures that the buttress is generally aligned to coincide with and cover the pattern of staples ejected from the stapler. The buttress 12 may be self-aligned using an opening in its central region sized to closely fit the central shaft of a circular stapler with which it is used. Alternatively, the buttress 12 may be self-aligned using the outer diameter of the stapler anvil compression surface 18 and the outer diameter of the stapler body compression surface 20. FIGS. 3A-3H, 3J, 3K, 6A and 6B show buttresses 12 adapted to self align using openings in their central regions. FIG. 6A shows a perspective view of a buttress 12 which has an opening feature 61 in its central region. FIG. 6B shows a cross section of the buttress shown in FIG. 6A. Surface 60 in FIG. 6B contacts the outer diameter of the central shaft 14 (FIG. 1B) of a circular stapler 10. FIG. 6C shows a perspective view of a buttress 12 which is adapted to self align onto the outer diameter of the stapler anvil compression surface 18 (FIG. 1B) or outer diameter of the stapler body compression surface 20 (FIG. 1B). FIG. 6D shows a cross section of the buttress shown in FIG. 6C. Surface 62 in FIG. 6D contacts the outer diameter of the stapler anvil compression surface 18 (FIG. 1B) or outer diameter of the stapler body compression surface 20 (FIG. 1B) to insure self alignment.
  • [0045]
    The buttress 12 can be made of a constant thickness or can be made of varying thickness, densities or materials of construction through their cross sections. Varying thicknesses, densities or materials of construction can be of advantage in some embodiments. For example, greater thickness or use of a denser material in the central region of the buttress would add rigidity, potentially aiding in self-aligning of the buttress 12 on the circular stapler 10. Thickness, density or material variations may also help to prevent deformation of the buttress 12 as the circular stapler is used in the process of pulling the stapler anvil 16 toward the stapler body 22 (as depicted in FIGS. 2B and 2C). This thicker or higher density material could be limited to the central region of the buttress so that the generally circular concentric cutting blade of the stapler 10 would cut through or around this thicker material and remove it while the stapler was being withdrawn. In another embodiment, thinner or less dense material could be made to generally coincide with the cutting diameter of the generally circular concentric cutting blade of the selected circular stapler to facilitate the cutting process. Alternatively, thicker, more dense or stronger material could be constructed into the buttress 12 so as to coincide with the areas where the staples are placed with thinner, less dense or weaker material used in other areas.
  • [0046]
    Three embodiments of buttresses 12 of varying cross sections are shown in FIGS. 4A-4C. FIG. 4A shows the side view of a buttress 12 that has a silicone disk 36 attached to it. The silicone disk 36 may be approximately 0.5 mm thick, made, for example, with Nusil MED 4080 (NuSil Technology, Carpinteria, Calif.) and can be provided with center hole sized to form a slight interference fit with the central shaft 14 of a circular stapler 10. The interference fit between the central shaft 14 of the stapler and the center hole in the silicone disk 36 provides for a means to securely fasten the buttress 12 to the circular stapler without an adhesive. The outer diameter of this silicone disk 36 is sized to correspond with the central region of the buttress 12, fitting within the diameter of the generally circular concentric cutting blade of a circular stapler 10.
  • [0047]
    One side of the silicone disc 36 is adhered to one side of the buttress 12 by covering one side of the disc 36 with a thin coating of a pressure sensitive adhesive formulation of silicone (e.g., NuSil MED 1356, NuSil Technology, Carpinteria, Calif.). After a 30 minute drying period, disc 36 may be placed onto one surface of buttress 12 with the adhesive coated surface of the silicone disk 36 facing towards the surface of the buttress 12 as illustrated in FIG. 4A. Compressive force is then applied to the silicone disk 36 to assure adequate bonding between of the silicone disk 36 to the buttress 12.
  • [0048]
    Other means of making the central section of the buttress 12 thicker may be used, such as using materials other than silicone or building up more self-cohering non-woven web thickness.
  • [0049]
    FIG. 4B shows the side view of a buttress 12 where the central region 37 is thicker due to the process of adding more material to the central region in comparison to the thickness adjacent the perimeter. FIG. 4C shows the top view of a buttress 12 where the central section 42 is made with thicker or higher density material. Spokes 44 emanating from the central section 42 are also made with thicker or higher density material. A perimeter area 46 of the buttress 12 as depicted can also be made with a thicker or higher density material to increase the strength of the material for staple reinforcement. The buttresses 12 depicted in FIGS. 3A-3E and 4A-4C and other designs that can be contemplated may also be constructed in a modular fashion such that individual materials can be combined to form the final device.
  • [0050]
    Additionally, buttresses 12 of various designs including those depicted in FIGS. 3A-3H, 3J, 3K, and 4A-4C can be used with a circular stapler that has a round or non-round central shaft. Circular staplers with non-round shafts with buttresses 12 having central openings corresponding to the shape of the shaft could facilitate indexing of the buttresses 12 to locations relative to the stapler anvil and body compression surfaces 18 and 20.
  • [0051]
    A buttress 12 can be constructed to exhibit either essentially elastic or essentially inelastic behavior. Essentially elastic behavior occurs when a buttress 12 is adequately deformable so as to allow an anvil head 16 of larger outer diameter to pass through the smaller diameter opening formed in the buttress 12 by the circular stapler cutting blade without causing permanent alteration or damage to the cut edge of the opening formed by the cutting action of the circular stapler blade. Permanent alteration of the cut edge results from tears, rips, or other permanent deformation. Essentially inelastic behavior occurs when an anvil head 16 of larger outer diameter than the smaller diameter opening formed in a buttress 12 by the circular stapler cutting blade causes permanent alteration or damage to the cut edge of the opening formed by the circular stapler cutting blade. The essentially inelastic buttress 12 by definition would rip, tear, or otherwise retain permanent alteration to the cut edge of the opening formed by the circular stapler cutting blade after passing the larger diameter anvil head 16 through the smaller opening formed by the circular stapler cutting blade. A buttress may be made from either relatively elastic (e.g., silicone) or relatively inelastic materials (e.g., PGA:TMC). If made from relatively inelastic materials, the buttress may be fabricated in such a way as to now possess essentially elastic behavior. For example, inelastic materials may be fabricated into a material possessing a degree of porosity, such as a weave or a web, wherein the porosity provides for adequate flexibility thereby allowing the resulting buttress to demonstrate essentially elastic behavior.
  • [0052]
    The relief features shown in FIGS. 3A-3H, 3J and 3K as well as others can be used with either essentially elastic or essentially inelastic buttresses 12. These relief features will be required, however, for buttresses 12 that without such relief features would exhibit essentially inelastic behavior.
  • [0053]
    FIG. 5A shows the top view of a buttress 12 which has a central opening 30 sized to closely fit the outside diameter of a central tubular shaft 14 of a circular stapler 10. FIG. 5B shows the top view of a buttress 12 after a hole with a cut edge 38 has been cut through it by the action of a generally circular concentric cutting blade of a circular stapler 10. FIG. 5C shows the top view of a buttress 12 constructed to be elastic after a circular stapler anvil head 16 with a compression surface 18 that has an outer diameter larger than the diameter of the cut edge 38 of the opening formed by the action of a generally circular concentric cutting blade has been passed through it. No substantial permanent alteration or damage is made to the cut edge 38 of the opening formed by the generally circular concentric cutting blade of the circular stapler.
  • [0054]
    FIGS. 5D, 5E and 5G show the top and side views of buttresses 12 that are inelastic and without relief features such as shown in FIGS. 3A-3H, 3J and 3K, after pulling through a circular stapler anvil head 16 with a compression surface 18 that has an outer diameter larger than the diameter of the cut edge 38 of an opening formed by the action of a generally circular concentric cutting blade. These buttresses 12 show substantial permanent alteration or damage to the cut edge 38 area of the opening formed by the action of a generally circular concentric cutting blade of a circular stapler 10. FIG. 5D of an inelastic buttress 12 shows tears 48 around the cut edge 38 of the opening caused by pulling through a circular stapler anvil head 16 with a compression surface 18 that has a larger diameter than that of the opening. FIGS. 5E and 5G of an inelastic buttress 12 show deformation 49 around the cut edge 38 of the opening caused by pulling through a circular stapler anvil head 16 with a compression surface 18 that has a larger diameter than that of the opening. Other modes of substantial permanent alteration or damage of the cut edge 38 can be contemplated.
  • [0055]
    In order to evaluate the compatibility of buttresses of the present invention with circular staplers, two buttresses of 67% PGA:33% TMC (w/w) having a web density of about 0.5 g/cc. These buttresses were made to have a circular shape with an outside diameter of approximately 30 mm, for use with a circular stapler (ILS 29 mm, Ethicon Endosurgery, Somerville N.J.). The buttresses were of uniform thickness of about 0.25 mm, and were provided with a center hole of about 6.3 mm diameter. The central region of each buttress was also provided with a circular silicone stiffener having a diameter of about 19.1 mm and a thickness of about 0.5 mm. Each of these stiffeners was provided with a 6.3 mm diameter hole at its center. One stiffener was adhered to one side of each buttress with the center holes through each component aligned, using MED-1356 silicone adhesive, Nusil technologies, Carpenteria Calif.
  • [0056]
    A 30 cm section of porcine colon was obtained and cut in half; purse string sutures were made on adjacent ends of the large bowel sections. The anvil, with first buttress in place with the stiffener facing the stapler body, was fed through one section so that the anvil post protruded through the hole in the purse-stringed end. The stapler body, with the shaft extended and with the second buttress in place with the stiffener facing the anvil, was advanced through the adjacent colon tissue until the post protruded through the purse-stringed hole. The anvil post was mated to the body shaft and closed via the actuator knob on the proximal end of the device according to the manufacturer's instructions for use. After firing the stapler and rotating the actuator knob two full turns, the stapler was rotated 90 degrees relative to the anastomosis in both directions and then removed from the colon tissue, pulling the anvil through the anastomosis. Both sides of the anastomosis were observed visually for integrity of the buttresses after removing the anvil (of 28.6 mm outside diameter) through the cut hole (of 20.8 mm diameter). All staples on both sides of the anastomosis were captured and no signs of tearing or disfigurement were observed.
  • [0057]
    An additional pair of buttresses was fabricated and tested in the same manner. Each buttress of this additional pair was provided with four slits through the thickness of the material, spaced 90 degrees apart and extending radially outward from a point 1.9 mm from the edge of the center hole for a length of 7.6 mm. During testing, this pair was determined to be equally effective as the first pair.
  • [0058]
    While the principles of the invention have been made clear in the illustrative embodiments set forth herein, it will be obvious to those skilled in the art to make various modifications to the structure, arrangement, proportion, elements, materials and components used in the practice of the invention. To the extent that these various modifications do not depart from the spirit and scope of the appended claims, they are intended to be encompassed therein.

Claims (71)

  1. 1. A reinforcement device for use with a circular stapler that is adapted to create and seal a surgical opening in a patient comprising:
    a buttress adapted for mounting on the circular stapler, the stapler having an anvil that is larger in diameter than the surgical opening that is created by the stapler, wherein following stapling with the stapler, the buttress reinforces the surgical opening created by the stapler in the patient;
    wherein the buttress includes at least one adaptive opening created by the circular stapler which corresponds to the surgical opening in the patient, said adaptive opening when circular having a diameter smaller than the diameter of the anvil, and wherein the adaptive opening in the buttress allows the anvil to be removed therethrough without causing permanent alteration to the buttress.
  2. 2. The reinforcement device of claim 1 wherein the permanent alteration includes tearing.
  3. 3. The reinforcement device of claim 1 wherein the permanent alteration includes permanent deformation to the adaptive opening created by the stapler.
  4. 4. The reinforcement device of claim 1 wherein the buttress has slits along a periphery of the adaptive opening.
  5. 5. The reinforcement device of claim 1 wherein the buttress is corrugated along a periphery of the adaptive opening.
  6. 6. The reinforcement device of claim 1 wherein the buttress self-aligns on the stapler.
  7. 7. The reinforcement device of claim 6 wherein the self-aligned buttress is retained on the stapler without use of an adhesive.
  8. 8. The reinforcement device of claim 6 wherein the buttress self-aligns with respect to a central shaft on the stapler.
  9. 9. The reinforcement device of claim 6 wherein the buttress self-aligns on the stapler by conforming to an edge delimiting an outer diameter of the stapler.
  10. 10. The reinforcement device of claim 1 wherein the reinforcement buttress comprises a bioabsorbable material.
  11. 11. The reinforcement device of claim 10, wherein the bioabsorbable material comprises a copolymer of poly(glycolide:trimethylene carbonate).
  12. 12. The reinforcement device of claim 1 wherein the buttress includes a filler material.
  13. 13. The reinforcement device of claim 12 wherein the filler material comprises a therapeutic agent.
  14. 14. The reinforcement device of claim 12 wherein the filler material comprises a bioactive agent.
  15. 15. The reinforcement device of claim 1 wherein the buttress comprises an essentially inelastic material.
  16. 16. The reinforcement device of claim 1 wherein the buttress comprises an essentially elastic material.
  17. 17. The reinforcement device of claim 1 wherein the buttress comprises at least one polymeric material.
  18. 18. The reinforcement device of claim 17 wherein the polymeric material comprises polytetrafluoroethylene.
  19. 19. The reinforcement device of claim 18 wherein the polytetrafluoroethylene is porous expanded polytetrafluoroethylene.
  20. 20. The reinforcement device of claim 1 wherein the circular stapler is adapted to create an anastomotic junction between body tissue; and the buttress augments resistance to radial distension at the anastomotic junction.
  21. 21. The reinforcement device of claim 1 wherein the device has a reinforced central region that provides added rigidity to the central region.
  22. 22. The reinforcement device of claim 21 wherein the central region has greater thickness than other regions of the device.
  23. 23. The reinforcement device of claim 21 wherein the central region has denser material than other regions of the device.
  24. 24. A reinforcement device for use with a circular stapler that is adapted to create a substantially circular hole in a patient, said circular stapler having a central shaft, comprising:
    a buttress adapted for mounting on the central shaft of the circular stapler;
    wherein the buttress self-aligns around the central shaft; and
    wherein the buttress reinforces the hole created by the stapler in the patient.
  25. 25. The reinforcement device of claim 24 wherein the stapler includes an anvil that is larger in diameter than the circular hole that is created by the stapler.
  26. 26. The reinforcement device of claim 24 wherein the buttress comprises an essentially elastic material.
  27. 27. The reinforcement device of claim 24 wherein the buttress comprises an essentially inelastic material.
  28. 28. The reinforcement device of claim 24 wherein the buttress comprises at least one polymeric material.
  29. 29. The reinforcement device of claim 28 wherein the polymeric material comprises polytetrafluoroethylene.
  30. 30. The reinforcement device of claim 29 wherein the polytetrafluoroethylene is porous expanded polytetrafluoroethylene.
  31. 31. The reinforcement device of claim 24 wherein the buttress comprises a bioabsorbable material.
  32. 32. The reinforcement device of claim 31, wherein the bioabsorbable material comprises a copolymer of poly(glycolide:trimethylene carbonate).
  33. 33. The reinforcement device of claim 24 wherein the buttress includes a filler.
  34. 34. The reinforcement device of claim 33 wherein the filler includes a therapeutic agent.
  35. 35. The reinforcement device of claim 33 wherein the filler includes a bioactive agent.
  36. 36. A reinforcement device comprising: a circular stapler that is adapted to create a substantially circular hole in a patient, said circular stapler having a stapler anvil compression surface outer diameter and a stapler body compression surface outer diameter; a first buttress adapted to self align onto the stapler anvil compression surface outer diameter and the stapler body compression surface outer diameter; a second buttress adapted to self align onto the stapler body compression surface outer diameter; and
    wherein the first and second buttresses reinforce the hole created by the stapler in the patient when staples are applied.
  37. 37. The reinforcement device of claim 36 wherein the stapler includes an anvil that is larger in diameter than the circular hole that is created by the stapler.
  38. 38. The reinforcement device of claim 36 wherein the buttress comprises an essentially elastic material.
  39. 39. The reinforcement device of claim 36 wherein the buttress comprises an essentially inelastic material.
  40. 40. The reinforcement device of claim 36 wherein the buttress comprises at least one polymeric material.
  41. 41. The reinforcement device of claim 40 wherein the polymeric material comprises polytetrafluoroethylene.
  42. 42. The reinforcement device of claim 41 wherein the polytetrafluoroethylene is porous expanded polytetrafluoroethylene.
  43. 43. The reinforcement device of claim 36 wherein the buttress comprises a bioabsorbable material.
  44. 44. The reinforcement device of claim 43, wherein the bioabsorbable material comprises a copolymer of poly(glycolide:trimethylene carbonate).
  45. 45. The reinforcement device of claim 36 wherein the buttress includes a filler.
  46. 46. The reinforcement device of claim 45 wherein the filler includes a therapeutic agent.
  47. 47. The reinforcement device of claim 45 wherein the filler includes a bioactive agent.
  48. 48. A reinforcement device comprising: a circular stapler that is adapted to create a substantially circular hole in a patient, said circular stapler having a stapler anvil compression surface outer diameter at least one buttress adapted to self align onto the stapler anvil compression surface outer diameter; and
    wherein the buttress reinforces the hole created by the stapler in the patient when staples are applied.
  49. 49. The reinforcement device of claim 48 wherein the stapler includes an anvil that is larger in diameter than the circular hole that is created by the stapler.
  50. 50. The reinforcement device of claim 48 wherein the buttress comprises an essentially elastic material.
  51. 51. The reinforcement device of claim 48 wherein the buttress comprises an essentially inelastic material.
  52. 52. The reinforcement device of claim 48 wherein the buttress comprises at least one polymeric material.
  53. 53. The reinforcement device of claim 52 wherein the polymeric material comprises polytetrafluoroethylene.
  54. 54. The reinforcement device of claim 53 wherein the polytetrafluoroethylene is porous expanded polytetrafluoroethylene.
  55. 55. The reinforcement device of claim 48 wherein the buttress comprises a bioabsorbable material.
  56. 56. The reinforcement device of claim 55, wherein the bioabsorbable material comprises a copolymer of poly(glycolide:trimethylene carbonate).
  57. 57. The reinforcement device of claim 48 wherein the buttress includes a filler.
  58. 58. The reinforcement device of claim 57 wherein the filler includes a therapeutic agent.
  59. 59. The reinforcement device of claim 57 wherein the filler includes a bioactive agent.
  60. 60. A reinforcement device comprising: a circular stapler that is adapted to create a substantially circular hole in a patient, said circular stapler having a stapler body compression surface outer diameter at least one buttress adapted to self align onto the stapler body compression surface outer diameter;
    wherein the buttress reinforces the hole created by the stapler in the patient when staples are applied.
  61. 61. The reinforcement device of claim 60 wherein the stapler includes an anvil that is larger in diameter than the circular hole that is created by the stapler.
  62. 62. The reinforcement device of claim 60 wherein the buttress comprises an essentially elastic material.
  63. 63. The reinforcement device of claim 60 wherein the buttress comprises an essentially inelastic material.
  64. 64. The reinforcement device of claim 60 wherein the buttress comprises at least one polymeric material.
  65. 65. The reinforcement device of claim 64 wherein the polymeric material comprises polytetrafluoroethylene.
  66. 66. The reinforcement device of claim 65 wherein the polytetrafluoroethylene is porous expanded polytetrafluoroethylene.
  67. 67. The reinforcement device of claim 60 wherein the buttress comprises a bioabsorbable material.
  68. 68. The reinforcement device of claim 67, wherein the bioabsorbable material comprises a copolymer of poly(glycolide:trimethylene carbonate).
  69. 69. The reinforcement device of claim 60 wherein the buttress includes a filler.
  70. 70. The reinforcement device of claim 69 wherein the filler includes a therapeutic agent.
  71. 71. The reinforcement device of claim 69 wherein the filler includes a bioactive agent.
US10666204 2003-09-17 2003-09-17 Circular stapler buttress Abandoned US20050059997A1 (en)

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Application Number Priority Date Filing Date Title
US10666204 US20050059997A1 (en) 2003-09-17 2003-09-17 Circular stapler buttress
US10944149 US7547312B2 (en) 2003-09-17 2004-09-16 Circular stapler buttress
JP2006527082A JP4464402B2 (en) 2003-09-17 2004-09-17 Buttress of a circular stapler
EP20040784459 EP1663016B1 (en) 2003-09-17 2004-09-17 Circular stapler buttress
CA 2537212 CA2537212C (en) 2003-09-17 2004-09-17 Circular stapler buttress
ES04784459T ES2572153T3 (en) 2003-09-17 2004-09-17 Circular stapler buttress
PCT/US2004/030600 WO2005027983A3 (en) 2003-09-17 2004-09-17 Circular stapler buttress
US12015056 US8556918B2 (en) 2003-09-17 2008-01-16 Circular stapler buttress
US12015087 US8123766B2 (en) 2003-09-17 2008-01-16 Circular stapler buttress
US12244306 US8679137B2 (en) 2003-09-17 2008-10-02 Circular stapler buttress
US12254625 US8123767B2 (en) 2003-09-17 2008-10-20 Circular stapler buttress

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US12015087 Active 2026-05-22 US8123766B2 (en) 2003-09-17 2008-01-16 Circular stapler buttress
US12015056 Active 2025-08-03 US8556918B2 (en) 2003-09-17 2008-01-16 Circular stapler buttress
US12244306 Active 2024-12-09 US8679137B2 (en) 2003-09-17 2008-10-02 Circular stapler buttress
US12254625 Active 2025-04-24 US8123767B2 (en) 2003-09-17 2008-10-20 Circular stapler buttress

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US12244306 Active 2024-12-09 US8679137B2 (en) 2003-09-17 2008-10-02 Circular stapler buttress
US12254625 Active 2025-04-24 US8123767B2 (en) 2003-09-17 2008-10-20 Circular stapler buttress

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US8123767B2 (en) 2012-02-28 grant
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