CA2151901A1 - Surgical stapler apparatus with improved staple pockets - Google Patents
Surgical stapler apparatus with improved staple pocketsInfo
- Publication number
- CA2151901A1 CA2151901A1 CA002151901A CA2151901A CA2151901A1 CA 2151901 A1 CA2151901 A1 CA 2151901A1 CA 002151901 A CA002151901 A CA 002151901A CA 2151901 A CA2151901 A CA 2151901A CA 2151901 A1 CA2151901 A1 CA 2151901A1
- Authority
- CA
- Canada
- Prior art keywords
- staple
- forming
- staple leg
- channeling
- anvil
- 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
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/072—Surgical 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/072—Surgical 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
- A61B17/07207—Surgical 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 the staples being applied sequentially
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
- A61B17/072—Surgical 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
- A61B2017/07214—Stapler heads
- A61B2017/07257—Stapler heads characterised by its anvil
- A61B2017/07264—Stapler heads characterised by its anvil characterised by its staple forming cavities, e.g. geometry or material
Abstract
An apparatus is disclosed for driving one or more U-shaped surgical staples through body tissue and against an anvil to deflect, crimp, or clinch the ends of the staple legs and thereby secure the tissue. The apparatus has an anvil with a plurality of staple pockets in the surface of the anvil. Each staple pocket has a first and a second staple leg forming cup. At least one channeling surface is disposed around a perimeter of each of the staple leg forming cups to guide the staple legs into the staple leg forming cups. The channeling surfaces have a substantially lemniscate shape.
Description
21Slg~l 1613 (203-1459) SURGICAL STAPLER APPARATUS
WITH IMPROVED STAPLE POCKETS
1. Technical Field The tec-hnical field relates to surgical staplers, and more particularly to improved anvils for use in surgical staplers of the type in which one or more U-shaped surgical staples are driven through body tissue and against an anvil to deflect, crimp, or clinch the ends of the staple legs and thereby secure the tissue.
WITH IMPROVED STAPLE POCKETS
1. Technical Field The tec-hnical field relates to surgical staplers, and more particularly to improved anvils for use in surgical staplers of the type in which one or more U-shaped surgical staples are driven through body tissue and against an anvil to deflect, crimp, or clinch the ends of the staple legs and thereby secure the tissue.
2. Background of Related Art Surgical staplers having a wide variety of configurations are known. In one general type of surgical stapler, the tissue to be stapled is positioned between a staple holding assembly and an opposing anvil assembly, and one or more generally U-shAp~ staples are driven from the staple holding assembly, through the tissue, and against the anvil to deflect, crimp, or clinch the ends of the legs of the staples and secure the tissue. In relation to forming a staple, the words "deflect", crimp, and "clinch" are used interchangeably herein to refer to deformation of the staple by the anvil. Examples of of surgical staplers having anvils are disclosed in. U.S. Patent Nos. 4,508,253, 4,520,817, 5,040,715, 5,119,983 and 5,318,221.
In staplers of the general type described above, it is conventional to provide separate anvil slots at each staple forming location. This makes it necessary to maintain relatively stringent alignment between the staple -2- 2 1~1 9 01 holding assembly and the anvil to assure that the staples enter the anvil slots correctly for proper clinching. It is important that every staple be formed properly since an incompletely or improperly formed staple may leave a gap in a wound closure. The importance of maintaining good alignment between the relatively movable staple holding assembly and anvil assembly may contribute to the complexity of the instrument and to the cost of manufacturing and maintaining it.
SUMMARY
An anvil for use with surgical staplers is provided in which the staple crimping surface of the anvil assembly has a plurality of staple pockets each having first and second staple leg forming cups. Each of the staple forming cups is supplemented about its periphery by at least one channeling surface formed in the surface of the anvil.
Each channeling surface has a slope different than that of the staple leg forming cup(s) that it surrounds. The anvil is configured such that respective staple legs of the staple initially contact the channeling surface wherein the staple legs are directed into the staple leg forming cups of the staple pockets.
In one embodiment, each staple leg forming cup has a cross section surface forming an arc having a radius R.
The staple leg forming cups are configured to receive a staple made of round wire having a radius r, wherein the radius R is in the range of l.Or to 2.Or.
2~l9~l BRIEF DESCRIPTION OF THE DRAWINGS
Various embodiments are described herein with reference to the drawings, wherein:
FIG. 1 illustrates a perspective view of a surgical stapling apparatus for use with the anvil member;
FIG. 2 illustrates a side view in partial cross section of the cartridge and anvil structure;
FIG. 3 is a frontal view of a staple of the type formed by one of the staple pockets of the anvil;
FIG. 4 is a bottom plan view of the anvil member of FIG. 1 illustrating a preferred embodiment of the array of staple pockets;
FIG. 5 is a partial perspective view of the anvil member of FIG. 4 illustrating a single staple pocket;
FIG. 6 is a top plan view of the staple pocket of FIG. 5;
FIG. 7 is a view taken along lines 7-7 of FIG. 5 illustrating the staple pocket;
FIG. 8 is a view taken along lines 8-8 of FIG. 5 illustrating the height characteristics of the staple pocket;
FIG. 9 is a view similar to that of FIG. 5 illustrating a staple prior to formation by the staple pocket;
- 21~901 FIG. 10 is a view similar to that of FIG. 9 illustrating the staple partially formed by the staple pocket;
FIG. 11 is a view similar to that of FIG. 10 illustrating the staple fully formed by the staple pocket;
and FIG. 12 is a cross-sectional view of a staple leg disposed within an alternative embodiment of a staple leg forming cup.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Fig. 1 illustrates a typical linear closure surgical stapler of the type shown, for example, in Green et al. U.S. Patent No. 5,318,221. The particular configuration of the stapler is not critical to the present invention, and the stapler shown serves only to illustrate one possible environment for the invention. The invention can be utilized in other linear staplers, such as those described in U.S. Patent Nos. 4,508,253, 4,520,819, and in circular staplers, such as that disclosed in U.S. Patent No.
5,119,983.
As is now well known to those skilled in the art, the stapler 10 shown in Fig. 1 includes an endoscopic portion 14 exten~;ng longitudinally from frame 12. The distal end of endoscopic portion 14 holds a cartridge assembly 16 and an anvil member 18.
Referring to Fig. 2, anvil member 18 is an elongated piece having a tissue contacting surface 22 and 2l5l9ol - s -staple pockets 24 formed therein. Anvil member 18 is pivotable between an open position, and a closed position where the anvil forming surface is brought into close cooperative alignment with the cartridge assembly 16. Anvil member 18 provides one of the jaws of the instrument for clamping and securing the body tissue to be fastened.
Cartridge assembly 16 comprises a cartridge 40 with pusher elements or staple drivers 44, and surgical fasteners or staples 46. The staples 46 and staple drivers 44 are disposed such that as the cam bars 50 move distally and longit~l~;nAlly through cartridge 40, staple drivers 44 drive staples 46 through body tissue layers 52 and 54 which are to be joined, and against anvil member 18 where the legs of the staples are crimped in staple pockets 24.
As best seen in Fig. 3, each staple 46 is typically preformed in the shape of a square cornered U.
Each staple 46 includes two initially straight, substantially parallel legs 46a and 46b which are joined together at one end by base 46c. Legs 46a and 46b are typically at right angles to base 46c, and the free ends 56a and 56b are typically sharply pointed to facilitate penetration of the tissue to be stapled. Staple 46 is typically made of a round metal wire, although other cross-sectional chAres such as square or rectangular shapes are possible and are within the scope of this invention.
Although not necessary to an understAn~ing of the present invention, additional information regarding the 2l~l9ol construction and operation of staplers of the type shown in Fig. 1 and described above will be found in Green et al.
U.S. Patent Nos. 5,040,715 and 5,318,221.
In accordance with the present invention, the staple channeling and clinching surfaces of anvil member 18 will now be described with reference to Figs. 4-8. Anvil member 18 has a substantially flat upper surface 26 having a plurality of staple pockets 24 formed therein. Each staple pocket 24 has a first staple leg forming cup 28 and a second staple leg forming cup 30 for forming respective legs of a staple. Preferably, as shown in Fig. 6, staple leg forming cups 28 and 30 are symetrical about intermediate point 78.
As best seen in Figs. 6 and 8, a substantially lemniscate (figure-eight shaped curve) channeling surface 58 is also formed in the flat upper surface 26 around a perimeter of staple pocket 24. Channeling surface 58 forms an angle 0, with respect to a plane defined by flat upper surface 26, wherein 0 < 0 < 90. Each staple forming cup 28, 30 has a different slope than that of adjacent channeling surface 58.
Referring to Figs. 9-11, the first and second staple leg forming cups 28, 30 of staple pockets 24 are shaped to promote bending of staple legs 46a and 46b in a desired manner when staple 46 is driven against staple pocket 24. Channeling surface 58 is shaped so that free ends 56a and 56b of staple legs 46a and 46b are guided respectively toward first and second staple leg forming cups 28 and 30 of staple pocket 24 as best seen in Fig. 10. As ~5l9ol staple 46 is further driven toward anvil member 18 as seen in Figs. lO-ll, staple legs 46a and 46b are directed within first and second staple leg forming cups 28 and 30 toward intermediate point 78 and simultaneously formed by the surface contours of first and second staple leg forming cups 28 and 30.
The provision of channeling surface 58 disposed around a perimeter of staple pocket 24 relaxes the tolerances of the surgical stapler required for aligning cartridge assembly 16 with anvil member 18. The relative location of insertion of staple legs 46a and 46b, respectively, into staple pocket 24 is not critical as legs 46a and 46b will always be guided by channeling surface 58 into respective staple leg forming cups 28, 30 so that the proper finished staple will be formed. The requirement for precise alignment of staple legs 46a and 46b is reduced, and staple pocket 24 eases clearance and tolerance requirements for many parts of the surgical stapler. This in turn substantially reduces the cost of the apparatus and facilitates manufacture and maintenance of the apparatus.
In a preferred embodiment the staple is made of round wire as shown in Fig. 12. The round wire has a radius "r" and the cross section surface of first staple leg forming cup 28 is an arc of circle having a radius "R". "R"
is in the range from l.Or to 2.Or, preferably in the range of from l.Or to 1.5r.
-8- ~ 9 It will be understood that various modifications may be made to the embodiments disclosed herein. For example, the value of "R" may decrease progressively from the ends of the staple leg forming cups to a minor value at the intermediate point while "r" is equal to 1.5r at the proximal and distal ends while being only 1.2r at the intermediate point. Also, for example, the staple pockets can be shAre~ in a manner other than a lemniscate, such as an oval, rectangle, circle or hourglass shape.
Therefore, the above description should not be construed as limiting, but merely as exemplifications of preferred embodiments. Those skilled in art will envision other modifications within the scope and spirit of the claims appended hereto.
In staplers of the general type described above, it is conventional to provide separate anvil slots at each staple forming location. This makes it necessary to maintain relatively stringent alignment between the staple -2- 2 1~1 9 01 holding assembly and the anvil to assure that the staples enter the anvil slots correctly for proper clinching. It is important that every staple be formed properly since an incompletely or improperly formed staple may leave a gap in a wound closure. The importance of maintaining good alignment between the relatively movable staple holding assembly and anvil assembly may contribute to the complexity of the instrument and to the cost of manufacturing and maintaining it.
SUMMARY
An anvil for use with surgical staplers is provided in which the staple crimping surface of the anvil assembly has a plurality of staple pockets each having first and second staple leg forming cups. Each of the staple forming cups is supplemented about its periphery by at least one channeling surface formed in the surface of the anvil.
Each channeling surface has a slope different than that of the staple leg forming cup(s) that it surrounds. The anvil is configured such that respective staple legs of the staple initially contact the channeling surface wherein the staple legs are directed into the staple leg forming cups of the staple pockets.
In one embodiment, each staple leg forming cup has a cross section surface forming an arc having a radius R.
The staple leg forming cups are configured to receive a staple made of round wire having a radius r, wherein the radius R is in the range of l.Or to 2.Or.
2~l9~l BRIEF DESCRIPTION OF THE DRAWINGS
Various embodiments are described herein with reference to the drawings, wherein:
FIG. 1 illustrates a perspective view of a surgical stapling apparatus for use with the anvil member;
FIG. 2 illustrates a side view in partial cross section of the cartridge and anvil structure;
FIG. 3 is a frontal view of a staple of the type formed by one of the staple pockets of the anvil;
FIG. 4 is a bottom plan view of the anvil member of FIG. 1 illustrating a preferred embodiment of the array of staple pockets;
FIG. 5 is a partial perspective view of the anvil member of FIG. 4 illustrating a single staple pocket;
FIG. 6 is a top plan view of the staple pocket of FIG. 5;
FIG. 7 is a view taken along lines 7-7 of FIG. 5 illustrating the staple pocket;
FIG. 8 is a view taken along lines 8-8 of FIG. 5 illustrating the height characteristics of the staple pocket;
FIG. 9 is a view similar to that of FIG. 5 illustrating a staple prior to formation by the staple pocket;
- 21~901 FIG. 10 is a view similar to that of FIG. 9 illustrating the staple partially formed by the staple pocket;
FIG. 11 is a view similar to that of FIG. 10 illustrating the staple fully formed by the staple pocket;
and FIG. 12 is a cross-sectional view of a staple leg disposed within an alternative embodiment of a staple leg forming cup.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Fig. 1 illustrates a typical linear closure surgical stapler of the type shown, for example, in Green et al. U.S. Patent No. 5,318,221. The particular configuration of the stapler is not critical to the present invention, and the stapler shown serves only to illustrate one possible environment for the invention. The invention can be utilized in other linear staplers, such as those described in U.S. Patent Nos. 4,508,253, 4,520,819, and in circular staplers, such as that disclosed in U.S. Patent No.
5,119,983.
As is now well known to those skilled in the art, the stapler 10 shown in Fig. 1 includes an endoscopic portion 14 exten~;ng longitudinally from frame 12. The distal end of endoscopic portion 14 holds a cartridge assembly 16 and an anvil member 18.
Referring to Fig. 2, anvil member 18 is an elongated piece having a tissue contacting surface 22 and 2l5l9ol - s -staple pockets 24 formed therein. Anvil member 18 is pivotable between an open position, and a closed position where the anvil forming surface is brought into close cooperative alignment with the cartridge assembly 16. Anvil member 18 provides one of the jaws of the instrument for clamping and securing the body tissue to be fastened.
Cartridge assembly 16 comprises a cartridge 40 with pusher elements or staple drivers 44, and surgical fasteners or staples 46. The staples 46 and staple drivers 44 are disposed such that as the cam bars 50 move distally and longit~l~;nAlly through cartridge 40, staple drivers 44 drive staples 46 through body tissue layers 52 and 54 which are to be joined, and against anvil member 18 where the legs of the staples are crimped in staple pockets 24.
As best seen in Fig. 3, each staple 46 is typically preformed in the shape of a square cornered U.
Each staple 46 includes two initially straight, substantially parallel legs 46a and 46b which are joined together at one end by base 46c. Legs 46a and 46b are typically at right angles to base 46c, and the free ends 56a and 56b are typically sharply pointed to facilitate penetration of the tissue to be stapled. Staple 46 is typically made of a round metal wire, although other cross-sectional chAres such as square or rectangular shapes are possible and are within the scope of this invention.
Although not necessary to an understAn~ing of the present invention, additional information regarding the 2l~l9ol construction and operation of staplers of the type shown in Fig. 1 and described above will be found in Green et al.
U.S. Patent Nos. 5,040,715 and 5,318,221.
In accordance with the present invention, the staple channeling and clinching surfaces of anvil member 18 will now be described with reference to Figs. 4-8. Anvil member 18 has a substantially flat upper surface 26 having a plurality of staple pockets 24 formed therein. Each staple pocket 24 has a first staple leg forming cup 28 and a second staple leg forming cup 30 for forming respective legs of a staple. Preferably, as shown in Fig. 6, staple leg forming cups 28 and 30 are symetrical about intermediate point 78.
As best seen in Figs. 6 and 8, a substantially lemniscate (figure-eight shaped curve) channeling surface 58 is also formed in the flat upper surface 26 around a perimeter of staple pocket 24. Channeling surface 58 forms an angle 0, with respect to a plane defined by flat upper surface 26, wherein 0 < 0 < 90. Each staple forming cup 28, 30 has a different slope than that of adjacent channeling surface 58.
Referring to Figs. 9-11, the first and second staple leg forming cups 28, 30 of staple pockets 24 are shaped to promote bending of staple legs 46a and 46b in a desired manner when staple 46 is driven against staple pocket 24. Channeling surface 58 is shaped so that free ends 56a and 56b of staple legs 46a and 46b are guided respectively toward first and second staple leg forming cups 28 and 30 of staple pocket 24 as best seen in Fig. 10. As ~5l9ol staple 46 is further driven toward anvil member 18 as seen in Figs. lO-ll, staple legs 46a and 46b are directed within first and second staple leg forming cups 28 and 30 toward intermediate point 78 and simultaneously formed by the surface contours of first and second staple leg forming cups 28 and 30.
The provision of channeling surface 58 disposed around a perimeter of staple pocket 24 relaxes the tolerances of the surgical stapler required for aligning cartridge assembly 16 with anvil member 18. The relative location of insertion of staple legs 46a and 46b, respectively, into staple pocket 24 is not critical as legs 46a and 46b will always be guided by channeling surface 58 into respective staple leg forming cups 28, 30 so that the proper finished staple will be formed. The requirement for precise alignment of staple legs 46a and 46b is reduced, and staple pocket 24 eases clearance and tolerance requirements for many parts of the surgical stapler. This in turn substantially reduces the cost of the apparatus and facilitates manufacture and maintenance of the apparatus.
In a preferred embodiment the staple is made of round wire as shown in Fig. 12. The round wire has a radius "r" and the cross section surface of first staple leg forming cup 28 is an arc of circle having a radius "R". "R"
is in the range from l.Or to 2.Or, preferably in the range of from l.Or to 1.5r.
-8- ~ 9 It will be understood that various modifications may be made to the embodiments disclosed herein. For example, the value of "R" may decrease progressively from the ends of the staple leg forming cups to a minor value at the intermediate point while "r" is equal to 1.5r at the proximal and distal ends while being only 1.2r at the intermediate point. Also, for example, the staple pockets can be shAre~ in a manner other than a lemniscate, such as an oval, rectangle, circle or hourglass shape.
Therefore, the above description should not be construed as limiting, but merely as exemplifications of preferred embodiments. Those skilled in art will envision other modifications within the scope and spirit of the claims appended hereto.
Claims (16)
1. In a staple forming anvil of a surgical stapler, the anvil including a multiplicity of staple forming pockets, each having first and second staple leg forming cups, the improvement comprising a curved channeling surface formed around a perimeter of each of the staple leg forming cups.
2. The apparatus defined in claim 1 wherein the channeling surface has a substantially lemniscate shape.
3. The apparatus defined in claim 1 wherein the channeling surface has a slope different than that of each staple leg forming cup.
4. The apparatus defined in claim 1 wherein the anvil has an upper surface defining a plane, and wherein the channeling surface defines an axis forming an angle 0 with that of the plane wherein 0° < ? < 90°.
5. The apparatus defined in claim 1 wherein the first and second staple leg forming cups are symmetrical with respect to another about at least one axis.
6. The apparatus defined in claim 1 wherein the first and second staple leg forming cups are symmetrical about an intermediate point.
7. The apparatus according to claim 1 wherein the first and second staple leg forming cups have a cross section surface forming an arc having a radius R, wherein the first and second staple leg forming cups are configured to receive a staple made of round wire having a radius r wherein the radius R is in the range of 1.0 r to 2.0 r.
8. In a staple forming anvil of a surgical stapler, the anvil including a substantially flat upper surface defining a plane, a plurality of staple forming pockets formed in the upper surface, each staple forming pocket having first and second staple leg forming cups, the improvement comprising at least one channeling surface formed in the upper surface around a perimeter of each first and second staple leg forming cups, the at least one channeling surface defining an axis forming an angle T with the plane of the upper surface wherein 0° < ? < 90°.
9. The apparatus defined in claim 8 wherein the at least one channeling surface has a slope different than that of each staple leg forming cup the at least one channeling surface is formed around.
10. The apparatus defined in claim 9 wherein the first and second staple leg forming cups are symmetrical about an intermediate point.
11. The apparatus defined in claim 8 wherein the at least one channeling surface has a substantially lemniscate shape.
12. The apparatus defined in claim 8 wherein the at least one channeling surface has a substantially circular shape.
13. A surgical stapler having an anvil for forming a plurality of surgical staples, the anvil having a surface having plurality of staple forming depressions, the staple forming depressions each having a staple leg forming portion and a curved staple leg channeling portion at least partially disposed adjacent the staple leg forming portion.
14. The apparatus defined in claim 13 wherein the channeling surface has a substantially lemniscate shape.
15. The apparatus defined in claim 13 wherein the staple leg channeling portion has a slope different than that of the staple leg forming portion.
16. The surgical stapler defined in claim 13, wherein the staple forming depressions are arranged in at least one linear row.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/293,235 | 1994-08-19 | ||
US08/293,235 US5480089A (en) | 1994-08-19 | 1994-08-19 | Surgical stapler apparatus with improved staple pockets |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2151901A1 true CA2151901A1 (en) | 1996-02-20 |
Family
ID=23128266
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002151901A Abandoned CA2151901A1 (en) | 1994-08-19 | 1995-06-15 | Surgical stapler apparatus with improved staple pockets |
Country Status (3)
Country | Link |
---|---|
US (1) | US5480089A (en) |
EP (1) | EP0697197A1 (en) |
CA (1) | CA2151901A1 (en) |
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-
1994
- 1994-08-19 US US08/293,235 patent/US5480089A/en not_active Expired - Lifetime
-
1995
- 1995-06-15 CA CA002151901A patent/CA2151901A1/en not_active Abandoned
- 1995-07-04 EP EP95110415A patent/EP0697197A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
EP0697197A1 (en) | 1996-02-21 |
US5480089A (en) | 1996-01-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FZDE | Discontinued | ||
FZDE | Discontinued |
Effective date: 19990615 |