CA1284551C - Anvil assembly - Google Patents

Anvil assembly

Info

Publication number
CA1284551C
CA1284551C CA000535892A CA535892A CA1284551C CA 1284551 C CA1284551 C CA 1284551C CA 000535892 A CA000535892 A CA 000535892A CA 535892 A CA535892 A CA 535892A CA 1284551 C CA1284551 C CA 1284551C
Authority
CA
Canada
Prior art keywords
portions
staple
leg
initial contact
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.)
Expired - Lifetime
Application number
CA000535892A
Other languages
French (fr)
Inventor
Donald L. Hannula
Claude A. Vidal
Russell J. Redmond
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Application granted granted Critical
Publication of CA1284551C publication Critical patent/CA1284551C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C5/00—Manually operated portable stapling tools; Hand-held power-operated stapling tools; Staple feeding devices therefor
    • B25C5/02—Manually operated portable stapling tools; Hand-held power-operated stapling tools; Staple feeding devices therefor with provision for bending the ends of the staples on to the work
    • B25C5/0207—Particular clinching mechanisms
    • 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
    • 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

Abstract of the Disclosure An anvil against which leg portions of a staple can be pressed to close the staple. The leg shaping surfaces include bottom surfaces of sockets including relatively wide initial contact surface portions having widths that smoothly converge toward adjacent final guide portions of a uniform width so that even the legs of staples that contact the initial contact surfaces at positions spaced from the longitudinal center line of the socket will be guided into the final guide portions and bent closed in alignment with each other.

Description

~B45~i~

Technical Field_ The present invention relates to anvils against which generally straight parallel leg portions of a staple projecting at generally a right angle from opposite ends of a generally straight back portion of the staple can be pressed to bend the leg portions into arcuate shapes and form a generally B shaped closed staple.
In the accompanying drawing wherein like reference numerals refer to like parts in the several views;-Figure 1 is a top plan view of an improved anvil accor-ding to the present invention;
Figure 2 is a sectional view taken approximately along line 2-2 of Figure l;
Figure 3 is a reduced top plan view of the anvil of Figure 1 in which the closing of a staple against the anvil is schematically illustrated;
Figures 3A and 3B are bottom and side views respec-tively of a staple closed against the anvil of Figures 1, 2, and 3 in the manner illustrated in Figure 3;
Figure 4 is a fragmentary sectional view of a stapling assembly including the anvil of Figure 1 and a staple being pressed against the anvil;
Figure 5 is a top plan view of the prior art anvil in which the closing of a staple against the anvil is schematically illustrated;
Figures 5A and 5B are bottom and side views respective-ly of a staple closed against the anvil of Figure 5 in the .'. ~, 345~
-~ la - 60557-3200 manner illustrated in Figure 5;
Figures 6, 7, and 8 are enlarged fragmentary sectional views taken approximately along lines 6-6, 7-7, and 8-8 of Figure 1 respectively which do not show background details; and Figure 9 illustrates a structure incorporating a plurality of improved anvils according to the present invention.
Background Art Anvils of many shapes are known against which gener-ally straight parallel leg portions of a staple projecting at generally a right angle from opposite ends of a generally straight back portion of the staple can be pressed to bend the leg portions into arcuate shapes and form a generally B shaped closed staple.
Typically such anvils have walls defining a generally planar clamping surface adapted to engage one side of material (e.g., living tissue or paper) through which the leg portions of the staple are driven from the other side of the material, and staple leg shaping surfaces recessed from the clamping surface and defining a pair of elongate sockets aligned end to end, which leg shaping surfaces receive, guide and form the leg portions of the staple to close the staple. A commonly used anvil of this type is illustrated both in United States Patent No. 4,281,785 and in Figure 5 of the drawing of this application (to which Figure 5 the following reference numerals refer), which anvil has walls defining such a generally planar clamping surface 62 and staple leg shaping surfaces recessed from the clamping surface 62 and defining a pair of elongate sockets 64 aligned end to end. The ~L~8~SSl - lb - 60557 3200 leg shapin~ surfaces for each socket 64 comprise a continuous bottom surface which is concave about axes transverse of the socket 64 and comprises an initial contact portion 65 adjacent its end opposite the other of the sockets 64 and a final guide portion 66 adjacent the other of the sockets 64, 55~

and longitudinally extending side sur~aces 67 extending between the clampin~ surface 62 and the hottom surface. The initial contact portions 65 of the bottom surfaces have widths between the side surfaces 67 at their ends opposite 5 the ~inal guide portions 66 that are substantially larqer than the diameteK o~ the leq portions 70, 72 of a sta~le that the anvil is adapted to close, and smoothly converge in width between the side surfaces 67 toward the ~inal guide portions 66 o~ the bottom sur~aces so that leg portions 70, l0 72 of staples that contact the initi.al contact portions 65 even at positions spaced Erom the lon~itudinal center line of the sockets 64 w;.ll be ~uided into the ~inal guide portions 66. This is an i.mportant ~eature in most stapling devices because the larqe nurnber of staplinq device parts lS used to po.sition the le~s of staPles to be driven opposite anvils aqain.st wh;.ch they are to be closed make.s the possibility o~ some m;sali~nment ~etween the staples and anvils qui.te li.kely unless the staplinq devices are made to unreasona~ly close and cost].y tolerances. In an anvil oE the 20 type shown in Fiqure 5, however, the ~inal quide portions 66 of the bottom surfaces diverge in their widths between the side surfaces 67 toward the ends of the bottom surkaces adjacent the other socket 64 so that the leq portions oF
staples that contact the initial contact port;ons 65 at 25 positions spaced from the lonc~itudinal center line o~ the sockets 64, such a.s at the locat;.ons illustrate(1 for the leq portions 70 and 72 in Fiqure 5, can follow the path of least resistance illustrated ~y the dotted lines 74 and 76, resulting in an improperly closed staple such as that 30 illustrated in fiqures 5A and 5~ in which the formed lec~
portions 70 and 72 are not in aliqnment with each other or w;kh a qenerally straiqht central portion 68 of the staple, an~ the tips of the ~ormed leq portions 70 and 72 are not located as close to the straight central portion 68 of the 35 close~ stapLe a.s ls required to develop the full holding ~ower ~or the closed staple.
One attempt to correct the problem described above for anvils used to staple l;vinq tissues is descrihed in 3L2~3~SS~

U.S. Patent No. 3,494,533 which describes an anvil 6 which, like the anvil sllown in Figure 5 of this application, has walls AeEining a generally planar clamping surEace, and staple leg shaping surfaces 101 (see Figures 28 and 29) 5 recessed from the clamping surface and defining a pair of elongate sockets aligned end to end. The leg shaping surfaces for each socket comprise a cont;nuous bottom surface 101 which is concave about axes transverse oE the socket and comprises an initial contact portion lnla 10 adjacent its end opposite the other of the sockets and a f.inal guide portion lOlb adjacent the other of the sockets, and longitudinally extending side surfaces extending between the clamping surface and the bottom surEace 10l. ~n]ike the anvi.l described in Figure 5, however, in the anvil described 15 i.n U.~S. Patent No. 4,281,785 both the ;nitial contact portions lOla and the final guide portions lOlh of the bottom surEaces lOl have widths between the side surEaces transverse of the sockets that are uniform and only slightly larger than the diameter of the leg portion of a staple the 20 anvil is adapted to close so that the leg portions of a staple should be bent in alignment with each other if the staple leg portions are pressed against the bottom surfaces 101, and inwardly tapered lead in surfaces 103 are provided flanking the initial contact portions lOla that are intended 25 to guide the leg portions of staples that might initially contact the lead in surfaces 103 at posi.tions spaced from the longitudinal center line oE the socket to the initial contact portions lOla oE the bottom surfaces IOl. Such anvil shapes have not as yet seen signiEicant commerci.al 30 use, however, presumably becau~e the staple legs do not reliably move along the lead in surfaces 103 into the initial contact port.ions lOIa of the bottom surfaces 101, therefore causing such staples to be trapped against the lead in surEaces 103 so that they are deformed and not 35 properly closed.

~q~ s~

Summary of the Invention __ The present invention provides an anvil against which generally straight parallel leg portions of a staple of a predetermined diameter and projecting at generally a right angle from opposite ends of a back portion of the staple can be pressed to bend the leg portions into arcuate shapes and form a generally B shaped closed staple, said anvil having walls defining a generally planar clamping surface, and staple leg shaping sur-faces recessed from said clamping surface and defining a pair of elongate sockets aligned end to end, said leg shaping surfaces for each socket comprising a continuous bottom surface which is con-cave about axes transverse of the socket and comprises an initial contact portion adjacent its end opposite the other of said sockets and a final guide portion adjacent the other of said sockets, and longitudinally extending side surfaces extending between said clamping surface and said bottom surface, said initial contact portions having widths between said side surfaces at their ends opposite said final guide portions that are substantially larger than the diameter of said leg portions and converging smoothly in width between said side surfaces toward the adjacent parts of said final guide portions so that legs of staples that contact said initial contact portions at positions spaced from the longitudinal center line of said sockets will be guided by said initial contact portions and side surfaces into said final guide portions, wherein said bottom surfaces have generally uniform widths only slightly wider than the diameter of the leg portions of said staple between ~2~

said side surfaces along all of said final guide portions which final guide portions are aligned with each other so that the leg portions of the staple will be bent in alignment with each other for any initial contact position of the staple leg portions against the initial contact portions of said bottom surfaces as the staple is pressed against the anvil.
Unlike the anvil shown in United States Patent No.
4,281,785 and in Figure 5, the bottom surfaces of the anvil accor-ding to the present invention have generally uniform widths between the side surfaces only slightly wider than the diameter of the leg portions of the staple the anvil is adapted to close along all of the final guide portions so that the leg portions of a staple will be bent in alignment with each other for any initial orientation of staple leg portions pressed against the initial contact portions of the bottom surfaces.

Detailed l)escription Referring now to the drawing, there is shown an improved anvil according to the present invention generally designated by the reference numeral 10, which anvil 10 may 5 he made of metal or other suitable hard material by known proce~sses such as stamping or coining.
The anvil 10 is of the type against which generally straight para]lel leg portions 56 and 58 of a staple 50 projecting at generall.y a right angle from 10 opposite ends of a generalLy straight hack ~orti.on 60 of the sta~le 50 can he pressed as by a driver 54 in a staple drivinq mechan;sm 52 illustrated in Fiyure 4 to bend the leg r~ortions 56 and 5~ into arcuate shapes and form a generally 8 shaped closed staple as shown in Figures 3~ and 3~. The 15 anvil 10 has walls defini.ng a generally planar clamping sllrface 12 adapted to be positioned oppo.site and parallel to a cooperati.nq planar clamping surface 55 on the staple driving mechanism 52 between which clampinq surfaces 12 and 55 material (e.g., l;ving tissue or paper) to he stapled is 20 held during the stapling process, and sta~le leg shaping surfaces recessed from the clamping surface 12 and defining a pair of elongate sockets 14 aligned end to end, which sockets 14 are mirror images of each other. The leg shaping surfaces for each socket 14 comprise a continuous bottom 25 surface 16 which is concave about axes transverse of the socket 14 as can he seen in Figure 2 and comprises an i.nitial contact portion 20 adjacent its end opposite the other o~ the sockets 14, the length of which initial contact portion 20 is identified by a bracket and the reference 30 letter "b" along one of the hottom surfaces 16 shown in Figure l; and a final quide porti.on 24 adjacent the other of the sockets 14, the :length of which final guide portion 24 i.s identified hy a hracket anA the reference letter "a"
along one of the bottom surfaces 16 .shown in Figure 1. The 35 leg shaping surfaces also include longitudinally extending side surfaces 28 extending between the clamping surface 12 and the bottom surface 16 and converqing slightly from the 5~1 clamping sur~ace l2 toward the bottom surface 16. The initial contact portions 20 have widths between the side surfaces 28 at their ends opposite the Einal guide portions 24 t:hat are suhstantially wider than the diameter of the leg 5 portions 56 and 58 of the staple 50 that the anvil 10 is adapted to close, and the widths o~ the initial contact portions 2n smoothly converge between and with the side surfaces 28 toward the ~inal guide portions 24 with the portions of the side ~surfaces 28 ~lanki.ng the initial 10 contact portions 20 beinq convex ~so that leg portions 56, 58 o~ staples tllat contact the initial contact portions 20 at positions spaced from the lonqitudinal center line oE the sockets 14 such as at the positions illustrated in Fiqure 3 will be smoothly guided by the initial contact portions 20 15 and the convex adjacent side surEace portions into the final guide portions 24. The bottom surfaces 16 have generalLy uniform widths hetween the side surfaces 28 along all o~ the final ~uide portions 24, which uniform widths are only slightly wider than the diameter oE the leg portions 56 and 20 58 of the staple 50 the anvil 10 is adapted to close so that the leg portions 56 and 58 of the staple 50 will be guided along the aliyned final quide portions 24 and thereby bent in alignment with each other for any initial contact position of the staple leg portions 56 and 58 aqainst the 25 initial contact portions 20 of the bottom surEaces 16 as the staple 50 is pressed against the anvil ln, includinq the contact positions illu.strated in F`igure 3 which will. result in the stap].e leq portions 56 and 58 being thus bent into alignment along the paths 57 and 59 illustrated in Figure 3.
The ~inal guide portions 24 oE the bottom surfaces 16 defining the two sockets 14 meet at a ridqe 18 which could be co~lanar with the clam~inq surface 12, bllt preEerably is reces.sed rom the c~amping surEace 12 as is illustrated in Figure 2.
The bottom sur~aces 16 definin~ the two sockets 14 could be planar alonq their entire length, or, as illustrated and best seen in Figures 6, 7 and 8, the initial contact portions 20 thereof may be planar ~Figure 6), and the final guide portions 24 thereof may be qenerally cylindrically concave (Figures 7 and 8).
Figure 9 illustrates a structure 80 incorporating 5 a plurality of anvils according to the present invention each comprising staple forming surfaces 84 recessed from a common clamping surface 87 and having the same configuration as the .staple forming surfaces in the anvil lO. The structure 80 is adapted to close two parallel rows of 10 staples and is of tlle type u.sed in surgical stapling instrurnents such as an inverted linear anastomoses surgical staplinq instrument. As is apparent, anvils according to the present invention could al~so be used in surgical stapling instruments that apply staples in many other patterns such 15 as oval or circular.
The present invention has now been described with re~erence to two embodiments thereof. It will be apparent to those skilled in the art that many changes can be made in the embodi.ments described without departinq from the scope 20 O~ the present invention. Thus the .scope o~ the present invention should not be limited to the structures descried in this application, but only by structures described by the languaqe of the claims and the equivalents of those structure.s.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An anvil against which generally straight parallel leg portions of a staple of a predetermined diameter and projecting at generally a right angle from opposite ends of a back portion of the staple can be pressed to bend the leg portions into arcuate shapes and form a generally B shaped closed staple, said anvil having walls defining a generally planar clamping surface, and staple leg shaping surfaces recessed from said clamping surface and defin-ing a pair of elongate sockets aligned end to end, said, leg shaping surfaces for each socket comprising a continuous bottom surface which is concave about axes transverse of the socket and comprises an initial contact portion adjacent its end opposite the other of said sockets and a final guide portion adjacent the other of said sockets, and longitudinally extending side surfaces ex-tending between said clamping surface and said bottom surface, said initial contact portions having widths between said side surfaces at their ends opposite said final guide portions that are substan-tially larger than the diameter of said leg portions and converg-ing smoothly in width between said side surfaces toward the adjacent parts of said final guide portions so that legs of staples that contact said initial contact portions at positions spaced from the longitudinal center line of said sockets will be guided by said initial contact portions and side surfaces into said final guide portions, wherein said bottom surfaces have generally uniform widths only slightly wider than the diameter of the leg portions of said staple between said side surfaces along all of said final guide portions which final guide portions are aligned with each other so that the leg portions of the staple will be bent in alignment with each other for any initial contact position of the staple leg portions against the initial contact portions of said bottom surfaces as the staple is pressed against the anvil.
CA000535892A 1986-04-30 1987-04-29 Anvil assembly Expired - Lifetime CA1284551C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US85788586A 1986-04-30 1986-04-30
US857,885 1986-04-30

Publications (1)

Publication Number Publication Date
CA1284551C true CA1284551C (en) 1991-06-04

Family

ID=25326949

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000535892A Expired - Lifetime CA1284551C (en) 1986-04-30 1987-04-29 Anvil assembly

Country Status (4)

Country Link
EP (1) EP0251444A1 (en)
JP (1) JPS6333137A (en)
AU (1) AU589001B2 (en)
CA (1) CA1284551C (en)

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EP3943018A1 (en) 2020-07-20 2022-01-26 Covidien LP Surgical stapling device with tissue gap control and controlled staple formation

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AU7219687A (en) 1987-11-05
EP0251444A1 (en) 1988-01-07
AU589001B2 (en) 1989-09-28
JPS6333137A (en) 1988-02-12

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