US20140103091A1 - Staple pocket arrangement for surgical stapler - Google Patents

Staple pocket arrangement for surgical stapler Download PDF

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Publication number
US20140103091A1
US20140103091A1 US14/134,524 US201314134524A US2014103091A1 US 20140103091 A1 US20140103091 A1 US 20140103091A1 US 201314134524 A US201314134524 A US 201314134524A US 2014103091 A1 US2014103091 A1 US 2014103091A1
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Prior art keywords
staple
staple pocket
pocket
anvil
proximal
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US14/134,524
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Michael P. Whitman
John E. Burbank
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Covidien LP
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Covidien LP
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Priority to US14/134,524 priority Critical patent/US20140103091A1/en
Assigned to POWER MEDICAL INTERVENTIONS, INC. reassignment POWER MEDICAL INTERVENTIONS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WHITMAN, MICHAEL P., BURBANK, JOHN E.
Assigned to POWER MEDICAL INTERVENTIONS, LLC reassignment POWER MEDICAL INTERVENTIONS, LLC MERGER (SEE DOCUMENT FOR DETAILS). Assignors: POWER MEDICAL INTERVENTIONS, INC.
Assigned to TYCO HEALTHCARE GROUP LP reassignment TYCO HEALTHCARE GROUP LP ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: POWER MEDICAL INTERVENTIONS, LLC
Assigned to COVIDIEN LP reassignment COVIDIEN LP CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: TYCO HEALTHCARE GROUP LP
Publication of US20140103091A1 publication Critical patent/US20140103091A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • A61B17/0682—Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil
    • A61B17/0684—Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil having a forming anvil staying above the tissue during stapling
    • 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
    • A61B17/0682—Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil
    • A61B17/0686—Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil having a forming anvil staying below the tissue during stapling
    • 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
    • A61B2017/07228—Arrangement of the staples
    • 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

Definitions

  • the present invention relates to a staple pocket. More specifically, the present invention relates to a staple pocket arrangement for use in a surgical stapler.
  • FIG. 1 is a top view of a portion of conventional staple pocket arrangements on the anvil of a surgical stapler, e.g., a first arrangement on the upper side of the knife slot and a second arrangement on the lower side of the knife slot.
  • Conventional staple pockets are typically rectangular in shape and maybe arranged in parallel rows.
  • FIG. 2( a ) is a bottom perspective view of a conventional staple pocket arrangement on the anvil of a surgical stapler.
  • This staple pocket arrangement employs a steep canyon wall near the floor of the canyon which changes to a shallow angle for the rest of the canyon wall.
  • FIG. 2( b ) is a cross-sectional view of a portion of the staple pocket illustrated in FIG. 2( a ).
  • FIG. 2( b ) illustrates the staple leg being received within the staple pocket, e.g., moving in a vertical direction, and prior to the staple leg being bent into a closed position. The angle of 25.4 degrees shown in FIGS.
  • 2( a ) and 2 ( b ) is the angle of the surface of the staple pocket relative to the plane of the anvil surface, e.g., the slope angle of the surface along which the staple leg slides when the staple leg is initially received within the staple pocket at a location about 0.005 inches from the longitudinal edge of the staple pocket.
  • FIG. 3( a ) is a bottom perspective view of another conventional staple pocket arrangement on the anvil of a surgical stapler.
  • This staple pocket arrangement employs a steep canyon wall near the floor of the canyon which changes to a shallow angle for the rest of the canyon wall.
  • FIG. 3( b ) is a cross-sectional view of a portion of the staple pocket illustrated in FIG. 3( a ).
  • FIG. 3( b ) illustrates the staple leg being received within the staple pocket, e.g., moving in a vertical direction, and prior to the staple leg being bent into a closed position. The angle of 37.4 degrees shown in FIGS.
  • 3( a ) and 3 ( b ) is the angle of the surface of the staple pocket relative to the plane of the anvil surface, e.g., the slope angle of the surface along which the staple leg slides when the staple leg is initially received within the staple pocket at a location about 0.005 inches from the longitudinal edge of the staple pocket.
  • FIG. 4 is a top view of a portion of another conventional staple pocket arrangement on the anvil of a surgical stapler. In this arrangement, there are three longitudinal rows of the staple pockets located on each side of the knife slot.
  • One problem that may be encountered by conventional surgical staple pocket arrangements is that the staple pockets have sharp internal corners that may contribute to snagging or stalling the staple leg of a staple as the staple leg is progressively moved through the staple pocket.
  • Another problem that may be encountered by conventional surgical staple pocket arrangements is that the staple pockets have a narrow capture area, such that staples that are slightly mis-aligned relative to the staple pockets may miss the pocket.
  • Another problem that may be encountered by conventional surgical staple pocket arrangements is that the staple pockets may have too shallow a slope spread over a broad area so that incoming staple legs do not encounter a sufficiently steep slide angle, thereby causing the staple legs to stall and buckle.
  • a staple pocket arrangement on the anvil portion of a surgical stapler device includes pairs of staple pockets corresponding to each one of a plurality of staples to be closed.
  • the pair of staple pockets may be arranged along a center line.
  • a distal staple pocket may be provided for receiving and closing a distal-most leg of a staple
  • a proximal staple pocket may be provided for receiving and closing a proximal-most leg of a staple.
  • the distal staple pocket may be a mirror image of the proximal staple pocket.
  • the staple pockets may have a generally triangular shape when viewed from above.
  • Each respective staple leg is received at a longitudinal end of the staple pocket that provides a relatively wide target area for receiving the staple leg to eliminate or at least minimize the likelihood that a staple leg will miss the staple pocket due to, e.g., misalignment between a first jaw of the surgical stapler having the anvil and a second jaw of the surgical stapler having a cartridge configured to fire the staples.
  • each of the staple pockets is narrower at its opposite end, e.g., the end at which the staple leg emerges after being formed into an arc by the curved canyon floor of the staple pocket.
  • the staple pocket 110 may provide canyon walls, e.g., along which a staple leg is guided, that are steeply angled for the entire wall so that the staple leg travels toward and along the center of the canyon and then up and out the narrow end of the canyon.
  • the floor of the canyon may have a generally smooth and continuous curvature which provides, during bending of the staple leg, sufficiently large radii of curvature so as to eliminate or at least minimize tight corners that may snag or impede staple legs that are moving along the surface.
  • Each staple pocket in a first row of staple pockets may be nested with a staple pocket from an adjacent row of staple pockets.
  • each row of staple pockets is longitudinally offset from another row, e.g., by approximately one half of the pocket-pair (or staple) center-to-center pitch, the proximal staple pocket of a first row nests with a distal staple pocket of a second row.
  • the staple pocket arrangement may be more tolerant of poorly aimed staples, may make more efficient use of space on the anvil and may be less likely to cause a staple jam or buckling of the staple leg.
  • FIG. 1 is a top view of a portion of a conventional staple pocket arrangement on the anvil of a surgical stapler;
  • FIG. 2( a ) is a bottom perspective view of a conventional staple pocket arrangement on the anvil of a surgical stapler;
  • FIG. 2( b ) is a cross-sectional view of a portion of the staple pocket illustrated in FIG. 2( a );
  • FIG. 3( a ) is a bottom perspective view of another conventional staple pocket arrangement on the anvil of a surgical stapler;
  • FIG. 3( b ) is a cross-sectional view of a portion of the staple pocket illustrated in FIG. 3( a );
  • FIG. 4 is a top view of a portion of another conventional staple pocket arrangement on the anvil of a surgical stapler
  • FIG. 5 is a top view of a staple pocket arrangement on the anvil of a surgical stapler, in accordance with an example embodiment of the present invention
  • FIG. 6 is a cross-sectional view, taken along lines 6 - 6 , of a portion of the staple pocket illustrated in FIG. 5 ;
  • FIG. 7 is a cross-sectional view, taken along lines 7 - 7 , of a portion of the staple pocket illustrated in FIG. 5 ;
  • FIG. 8 is a top view of a staple pocket arrangement on the anvil of a surgical stapler, in accordance with an example embodiment of the present invention.
  • FIG. 9 is a bottom perspective view of another staple pocket arrangement on the anvil of a surgical stapler, in accordance with an example embodiment of the present invention.
  • FIG. 5 is a top view of a staple pocket arrangement on the anvil of a surgical stapler, in accordance with an example embodiment of the present invention.
  • FIG. 5 illustrates an anvil surface 100 having a first side 100 a and a second side 100 b separated by a knife slot.
  • a first row of staple pockets 110 has a center line 101 a and a second row of staple pockets 110 has a center line 101 b.
  • only several staple pockets 110 have been shown.
  • anvil surface 100 may have any number of staple pockets 100 in each of the rows.
  • exemplary embodiments described herein include rows of staple pockets that are arranged adjacent to a knife slot, exemplary embodiments of the present invention maybe employed in connection with any type of surgical stapler, e.g., with or without a knife slot or any other structural feature.
  • the anvil surface 100 is arranged with pairs of staple pockets 110 corresponding to each staple to be closed.
  • a distal staple pocket for receiving and closing a distal-most leg of a staple
  • a proximal staple pocket for receiving and closing a proximal-most leg of a staple.
  • the distal staple pocket 110 may be a mirror image of the proximal staple pocket 110 .
  • the staple pockets 110 may have various shapes. As shown in FIG. 5 , each staple pocket 110 may be roughly triangular in shape when viewed from above.
  • each staple pocket 110 may have a shape when viewed from above that resembles a “bicycle seat”, e.g., being generally triangular and having a series of convex and concave curves along its sides. Other shapes may also be employed.
  • Each respective staple leg is received at a longitudinal end of the staple pocket 110 that provides a relatively wide target area for receiving the staple leg. Since the staple pocket 110 is relatively wide at the longitudinal end at which the staple leg is received, the staple pocket arrangement may eliminate or at least minimize the likelihood that a staple leg will miss the staple pocket due to, e.g., misalignment between a first jaw of the surgical stapler having the anvil and a second jaw of the surgical stapler having a cartridge configured to fire the staples.
  • Each of the staple pockets 110 is narrower at its opposite end, e.g., the end at which the staple leg emerges after being formed into an arc by the curved canyon of the staple pocket 110 .
  • the staple pocket 110 provides staple guidance in that the canyon walls along which a staple leg is guided are steeply angled for the entire wall (see, for instance, FIG. 6 ) so that the staple leg travels toward and along the center of the canyon and then up and out the far end narrow end of the canyon.
  • the floor of the canyon has a generally smooth and continuous curvature which provides for the bending of the staple leg, as shown, for example, in FIG. 7 .
  • the floor of the canyon may have changing radii.
  • the surfaces of the staple pockets are joined to each other with sufficiently large radii so as to eliminate or at least minimize tight corners that may snag or impede staple legs that are moving along the surface. Furthermore, the compound angle between these surfaces provides a sufficiently steep slide ramp for the staple legs to follow. The staples follow these slide ramps down into the canyon for proper bending or forming even when the staple is not well aimed by the cartridge.
  • each staple pocket 110 in a first row of staple pockets 110 may be nested with a staple pocket from an adjacent row of staple pockets.
  • Each row of staple pockets (and corresponding staples) may be longitudinally offset from another row, e.g., by approximately one half of the pocket-pair (or staple) center-to-center pitch.
  • the proximal staple pocket of a first row nests with a distal staple pocket of a second row as shown in FIG. 5 .
  • a third row of staple pockets may be provided wherein the distal staple pocket of the second row also nests with the proximal staple pocket of the third row.
  • a series of staple pocket-pairs is formed in the anvil of a surgical stapling device.
  • the number of staple pocket-pairs and their location depends upon the desired staple pattern desired.
  • the sides of the staple pocket e.g., those portions between the inner and outer longitudinal ends, may be angled relative to a center line of the row.
  • adjacent sides of the staple pockets may be generally parallel to each other.
  • the section of tissue is clamped between the anvil and a cartridge loaded with staples.
  • Each staple in the cartridge is generally aligned with a corresponding pair of staple pockets.
  • the staples are pushed out of the cartridge so that the legs of the staples penetrate the section of tissue and proceed into the respective staple pockets.
  • Continuous operation of the staple firing mechanism causes the staple legs to be received into the wide end of the staple pocket 110 and to slide along the curved valley of the pocket to bend or form in accordance with the curvature of the staple pocket.
  • the legs of each staple are fully bent or formed such that the section of tissue is held between the spine of the staple and the bent staple legs.
  • the surgical staple pocket arrangement may provide advantages over the staple pocket arrangements of conventional surgical stapler devices.
  • the staple pocket arrangement hereof may provide an incoming staple leg capture area that is more tolerant of poorly aimed staples, e.g., that is able to receive and effectively bend a staple leg that is slightly mis-aligned relative to the center line of the staple pocket. This is due at least in part to the wide capture area located at the outer longitudinal end of the staple pockets and to the staple pockets' generally triangular shape.
  • one feature of the staple pockets hereof is the provision of a wide capture area at one end of the staple pocket, which permits effective operation of the surgical stapler device even for staple legs arriving off-center due to a reasonable amount of misalignment between the anvil and the staple cartridge.
  • Another feature hereof is that sharp corners which tend to snag the ends of staple legs are eliminated or at least minimized.
  • Another feature hereof is that regardless of where the end of the staple leg arrives across the broad end of the pocket, there is a sufficiently steep slope or sliding angle so that the staple leg is induced to follow the forming curvature of the pocket.
  • the steep sidewalls of the staple pocket function to guide the staple leg back towards the center of the staple as the staple leg gets bent or formed, regardless of off-center arrival of the staple leg. Rows of these pockets may be neatly nested alongside each other in close proximity, e.g., when phase shifted by approximately one half of the pocket-pair pitch. This nesting of the staple pockets of adjacent rows of staple pockets allows each staple pocket to have a greater staple capture area and permits adjacent rows of staple pockets to be spaced closer together.
  • the arrangement hereof may provide, relative to conventional staple pocket arrangements, a wider staple leg input capture area, a steeper slide angle to induce the staple to start forming, a shape that allows rows to be nested efficiently and an arrangement in which the radii of curvature of the staple pockets are broader than the radius of the staple wire.
  • the staple pocket arrangement may eliminate or at least minimize sharp corners which may tend to snag staples.
  • the staple pocket arrangement may be more tolerant of poorly aimed staples, makes more efficient use of space on the anvil and is less likely to cause a staple jam or buckling.
  • the staple pocket arrangement hereof may be formed by various manufacturing methods.
  • the staple pocket arrangement may be formed as described, e.g., in U.S. Provisional Patent Application No. 60/703,493, entitled “System and Method for Forming Staple Pockets of a Surgical Stapler”, filed on Jul. 27, 2005, and in U.S. patent application Ser. No. 11/494,999, filed on Jul. 27, 2006 (now U.S. Pat. No. 8,008,598), entitled “Method for Forming Staple Pockets of a Surgical Stapler,” each of which is expressly incorporated herein in its entirety by reference thereto.

Abstract

A staple pocket arrangement on the anvil portion of a surgical stapler device includes pairs of staple pockets corresponding to each one of a plurality of staples to be closed. Each respective staple leg is received at a longitudinal end of the staple pocket that provides a relatively wide target area for receiving the staple leg to eliminate or at least minimize the likelihood that a staple leg will miss the staple pocket. The staple pockets may be arranged in rows, each row of staple pockets being longitudinally offset from another row, such that each staple pocket in a first row of staple pockets is nested with a staple pocket from an adjacent row of staple pockets to make more efficient use of space on the anvil.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application is a Continuation Application which claims the benefit of and priority to U.S. patent application Ser. No. 12/849,986, filed Aug. 4, 2010, which is a Continuation Application which claims the benefit of and priority to U.S. patent application Ser. No. 11/495,011, filed Jul. 27, 2006 (now U.S. Pat. No. 7,815,092), which claims the benefit of and priority to U.S. Provisional Patent Application Ser. No. 60/703,262, entitled “Staple Pocket Arrangement for Surgical Stapler”, filed Jul. 27, 2005, each of which is expressly incorporated herein in its entirety by reference thereto.
    • FIELD OF THE INVENTION
  • The present invention relates to a staple pocket. More specifically, the present invention relates to a staple pocket arrangement for use in a surgical stapler.
    • BACKGROUND INFORMATION
  • Surgical staplers typically employ an anvil having staple pockets defined therein. Staples are pushed out of a staple cartridge through a section of tissue and against the staple pockets, the staple pockets being shaped so as to receive and progressively bend the legs of the staple into a closed position. FIG. 1 is a top view of a portion of conventional staple pocket arrangements on the anvil of a surgical stapler, e.g., a first arrangement on the upper side of the knife slot and a second arrangement on the lower side of the knife slot. Conventional staple pockets are typically rectangular in shape and maybe arranged in parallel rows.
  • FIG. 2( a) is a bottom perspective view of a conventional staple pocket arrangement on the anvil of a surgical stapler. This staple pocket arrangement employs a steep canyon wall near the floor of the canyon which changes to a shallow angle for the rest of the canyon wall. FIG. 2( b) is a cross-sectional view of a portion of the staple pocket illustrated in FIG. 2( a). FIG. 2( b) illustrates the staple leg being received within the staple pocket, e.g., moving in a vertical direction, and prior to the staple leg being bent into a closed position. The angle of 25.4 degrees shown in FIGS. 2( a) and 2(b) is the angle of the surface of the staple pocket relative to the plane of the anvil surface, e.g., the slope angle of the surface along which the staple leg slides when the staple leg is initially received within the staple pocket at a location about 0.005 inches from the longitudinal edge of the staple pocket.
  • FIG. 3( a) is a bottom perspective view of another conventional staple pocket arrangement on the anvil of a surgical stapler. This staple pocket arrangement employs a steep canyon wall near the floor of the canyon which changes to a shallow angle for the rest of the canyon wall. FIG. 3( b) is a cross-sectional view of a portion of the staple pocket illustrated in FIG. 3( a). FIG. 3( b) illustrates the staple leg being received within the staple pocket, e.g., moving in a vertical direction, and prior to the staple leg being bent into a closed position. The angle of 37.4 degrees shown in FIGS. 3( a) and 3(b) is the angle of the surface of the staple pocket relative to the plane of the anvil surface, e.g., the slope angle of the surface along which the staple leg slides when the staple leg is initially received within the staple pocket at a location about 0.005 inches from the longitudinal edge of the staple pocket.
  • FIG. 4 is a top view of a portion of another conventional staple pocket arrangement on the anvil of a surgical stapler. In this arrangement, there are three longitudinal rows of the staple pockets located on each side of the knife slot.
  • One problem that may be encountered by conventional surgical staple pocket arrangements is that the staple pockets have sharp internal corners that may contribute to snagging or stalling the staple leg of a staple as the staple leg is progressively moved through the staple pocket. Another problem that may be encountered by conventional surgical staple pocket arrangements is that the staple pockets have a narrow capture area, such that staples that are slightly mis-aligned relative to the staple pockets may miss the pocket. Another problem that may be encountered by conventional surgical staple pocket arrangements is that the staple pockets may have too shallow a slope spread over a broad area so that incoming staple legs do not encounter a sufficiently steep slide angle, thereby causing the staple legs to stall and buckle.
    • SUMMARY
  • According to an example embodiment of the present invention, a staple pocket arrangement on the anvil portion of a surgical stapler device includes pairs of staple pockets corresponding to each one of a plurality of staples to be closed. The pair of staple pockets may be arranged along a center line. A distal staple pocket may be provided for receiving and closing a distal-most leg of a staple, and a proximal staple pocket may be provided for receiving and closing a proximal-most leg of a staple. The distal staple pocket may be a mirror image of the proximal staple pocket.
  • The staple pockets may have a generally triangular shape when viewed from above. Each respective staple leg is received at a longitudinal end of the staple pocket that provides a relatively wide target area for receiving the staple leg to eliminate or at least minimize the likelihood that a staple leg will miss the staple pocket due to, e.g., misalignment between a first jaw of the surgical stapler having the anvil and a second jaw of the surgical stapler having a cartridge configured to fire the staples. Furthermore, each of the staple pockets is narrower at its opposite end, e.g., the end at which the staple leg emerges after being formed into an arc by the curved canyon floor of the staple pocket. The staple pocket 110 may provide canyon walls, e.g., along which a staple leg is guided, that are steeply angled for the entire wall so that the staple leg travels toward and along the center of the canyon and then up and out the narrow end of the canyon. The floor of the canyon may have a generally smooth and continuous curvature which provides, during bending of the staple leg, sufficiently large radii of curvature so as to eliminate or at least minimize tight corners that may snag or impede staple legs that are moving along the surface.
  • Each staple pocket in a first row of staple pockets may be nested with a staple pocket from an adjacent row of staple pockets. In this manner, when each row of staple pockets is longitudinally offset from another row, e.g., by approximately one half of the pocket-pair (or staple) center-to-center pitch, the proximal staple pocket of a first row nests with a distal staple pocket of a second row. The staple pocket arrangement may be more tolerant of poorly aimed staples, may make more efficient use of space on the anvil and may be less likely to cause a staple jam or buckling of the staple leg.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a top view of a portion of a conventional staple pocket arrangement on the anvil of a surgical stapler;
  • FIG. 2( a) is a bottom perspective view of a conventional staple pocket arrangement on the anvil of a surgical stapler;
  • FIG. 2( b) is a cross-sectional view of a portion of the staple pocket illustrated in FIG. 2( a);
  • FIG. 3( a) is a bottom perspective view of another conventional staple pocket arrangement on the anvil of a surgical stapler;
  • FIG. 3( b) is a cross-sectional view of a portion of the staple pocket illustrated in FIG. 3( a);
  • FIG. 4 is a top view of a portion of another conventional staple pocket arrangement on the anvil of a surgical stapler;
  • FIG. 5 is a top view of a staple pocket arrangement on the anvil of a surgical stapler, in accordance with an example embodiment of the present invention;
  • FIG. 6 is a cross-sectional view, taken along lines 6-6, of a portion of the staple pocket illustrated in FIG. 5;
  • FIG. 7 is a cross-sectional view, taken along lines 7-7, of a portion of the staple pocket illustrated in FIG. 5;
  • FIG. 8 is a top view of a staple pocket arrangement on the anvil of a surgical stapler, in accordance with an example embodiment of the present invention; and
  • FIG. 9 is a bottom perspective view of another staple pocket arrangement on the anvil of a surgical stapler, in accordance with an example embodiment of the present invention.
    •  DETAILED DESCRIPTION
  • FIG. 5 is a top view of a staple pocket arrangement on the anvil of a surgical stapler, in accordance with an example embodiment of the present invention. Specifically, FIG. 5 illustrates an anvil surface 100 having a first side 100 a and a second side 100 b separated by a knife slot. On each of the first side 100 a and the second side 100 b of the anvil surface 100 there is defined two rows of staple pockets 110. Referring to the first side 100 a of the anvil surface 100, a first row of staple pockets 110 has a center line 101 a and a second row of staple pockets 110 has a center line 101 b. For the purposes of clarity, only several staple pockets 110 have been shown. However, the anvil surface 100 may have any number of staple pockets 100 in each of the rows. Furthermore, while exemplary embodiments described herein include rows of staple pockets that are arranged adjacent to a knife slot, exemplary embodiments of the present invention maybe employed in connection with any type of surgical stapler, e.g., with or without a knife slot or any other structural feature.
  • The anvil surface 100 is arranged with pairs of staple pockets 110 corresponding to each staple to be closed. For instance, referring to the pair of staple pockets 110 arranged along the center line 101 a, there is provided a distal staple pocket for receiving and closing a distal-most leg of a staple, and a proximal staple pocket for receiving and closing a proximal-most leg of a staple. The distal staple pocket 110 may be a mirror image of the proximal staple pocket 110. The staple pockets 110 may have various shapes. As shown in FIG. 5, each staple pocket 110 may be roughly triangular in shape when viewed from above. Alternatively, each staple pocket 110 may have a shape when viewed from above that resembles a “bicycle seat”, e.g., being generally triangular and having a series of convex and concave curves along its sides. Other shapes may also be employed.
  • Each respective staple leg is received at a longitudinal end of the staple pocket 110 that provides a relatively wide target area for receiving the staple leg. Since the staple pocket 110 is relatively wide at the longitudinal end at which the staple leg is received, the staple pocket arrangement may eliminate or at least minimize the likelihood that a staple leg will miss the staple pocket due to, e.g., misalignment between a first jaw of the surgical stapler having the anvil and a second jaw of the surgical stapler having a cartridge configured to fire the staples. Each of the staple pockets 110 is narrower at its opposite end, e.g., the end at which the staple leg emerges after being formed into an arc by the curved canyon of the staple pocket 110. The staple pocket 110 provides staple guidance in that the canyon walls along which a staple leg is guided are steeply angled for the entire wall (see, for instance, FIG. 6) so that the staple leg travels toward and along the center of the canyon and then up and out the far end narrow end of the canyon. The floor of the canyon has a generally smooth and continuous curvature which provides for the bending of the staple leg, as shown, for example, in FIG. 7. Alternatively or additionally, the floor of the canyon may have changing radii. The surfaces of the staple pockets are joined to each other with sufficiently large radii so as to eliminate or at least minimize tight corners that may snag or impede staple legs that are moving along the surface. Furthermore, the compound angle between these surfaces provides a sufficiently steep slide ramp for the staple legs to follow. The staples follow these slide ramps down into the canyon for proper bending or forming even when the staple is not well aimed by the cartridge.
  • Since this opposite end of the staple pocket 110 is relatively narrow, each staple pocket 110 in a first row of staple pockets 110 may be nested with a staple pocket from an adjacent row of staple pockets. Each row of staple pockets (and corresponding staples) may be longitudinally offset from another row, e.g., by approximately one half of the pocket-pair (or staple) center-to-center pitch. Thus, the proximal staple pocket of a first row nests with a distal staple pocket of a second row as shown in FIG. 5. In an example embodiment, see, for instance FIG. 8, a third row of staple pockets may be provided wherein the distal staple pocket of the second row also nests with the proximal staple pocket of the third row.
  • A series of staple pocket-pairs is formed in the anvil of a surgical stapling device. The number of staple pocket-pairs and their location depends upon the desired staple pattern desired. Typically, there will be several rows of pockets arranged alongside, e.g., parallel to, each other. For example, the sides of the staple pocket, e.g., those portions between the inner and outer longitudinal ends, may be angled relative to a center line of the row. In such an arrangement, when the staple pocket in the first row of staple pockets is nested with the staple pocket from the second row of staple pockets, adjacent sides of the staple pockets may be generally parallel to each other.
  • The section of tissue is clamped between the anvil and a cartridge loaded with staples. Each staple in the cartridge is generally aligned with a corresponding pair of staple pockets. Upon firing, the staples are pushed out of the cartridge so that the legs of the staples penetrate the section of tissue and proceed into the respective staple pockets. Continuous operation of the staple firing mechanism causes the staple legs to be received into the wide end of the staple pocket 110 and to slide along the curved valley of the pocket to bend or form in accordance with the curvature of the staple pocket. Eventually, the legs of each staple are fully bent or formed such that the section of tissue is held between the spine of the staple and the bent staple legs.
  • The surgical staple pocket arrangement may provide advantages over the staple pocket arrangements of conventional surgical stapler devices. For instance, the staple pocket arrangement hereof may provide an incoming staple leg capture area that is more tolerant of poorly aimed staples, e.g., that is able to receive and effectively bend a staple leg that is slightly mis-aligned relative to the center line of the staple pocket. This is due at least in part to the wide capture area located at the outer longitudinal end of the staple pockets and to the staple pockets' generally triangular shape. Thus, one feature of the staple pockets hereof is the provision of a wide capture area at one end of the staple pocket, which permits effective operation of the surgical stapler device even for staple legs arriving off-center due to a reasonable amount of misalignment between the anvil and the staple cartridge. Another feature hereof is that sharp corners which tend to snag the ends of staple legs are eliminated or at least minimized. Another feature hereof is that regardless of where the end of the staple leg arrives across the broad end of the pocket, there is a sufficiently steep slope or sliding angle so that the staple leg is induced to follow the forming curvature of the pocket. The steep sidewalls of the staple pocket function to guide the staple leg back towards the center of the staple as the staple leg gets bent or formed, regardless of off-center arrival of the staple leg. Rows of these pockets may be neatly nested alongside each other in close proximity, e.g., when phase shifted by approximately one half of the pocket-pair pitch. This nesting of the staple pockets of adjacent rows of staple pockets allows each staple pocket to have a greater staple capture area and permits adjacent rows of staple pockets to be spaced closer together.
  • In summary, the arrangement hereof may provide, relative to conventional staple pocket arrangements, a wider staple leg input capture area, a steeper slide angle to induce the staple to start forming, a shape that allows rows to be nested efficiently and an arrangement in which the radii of curvature of the staple pockets are broader than the radius of the staple wire. The staple pocket arrangement may eliminate or at least minimize sharp corners which may tend to snag staples. Thus, the staple pocket arrangement may be more tolerant of poorly aimed staples, makes more efficient use of space on the anvil and is less likely to cause a staple jam or buckling.
  • The staple pocket arrangement hereof may be formed by various manufacturing methods. For example, the staple pocket arrangement may be formed as described, e.g., in U.S. Provisional Patent Application No. 60/703,493, entitled “System and Method for Forming Staple Pockets of a Surgical Stapler”, filed on Jul. 27, 2005, and in U.S. patent application Ser. No. 11/494,999, filed on Jul. 27, 2006 (now U.S. Pat. No. 8,008,598), entitled “Method for Forming Staple Pockets of a Surgical Stapler,” each of which is expressly incorporated herein in its entirety by reference thereto.

Claims (19)

1. (canceled)
2. A surgical stapler device for closing a plurality of staples, the surgical stapler device comprising:
an anvil portion defining a longitudinal axis that extends through a proximal end and a distal end of the anvil portion, the anvil portion including at least two rows of staple pockets, each row of the at least two rows of staple pockets extending longitudinally and including staple pocket set corresponding to each staple of the plurality of staples, each staple pocket set dimensioned to receive and form a corresponding staple of the plurality of staples, each staple pocket set including a distal staple pocket spaced apart from a proximal staple pocket, the distal staple pocket dimensioned to receive and form a distal staple leg of the corresponding staple, the proximal staple pocket dimensioned to receive and form a proximal staple leg of the corresponding staple, each staple pocket defined between a wide end and a narrow end, wherein the distal staple pocket of a first staple pocket set of a first one of the at least two rows is longitudinally aligned with the proximal staple pocket or a second staple pocket set of a second one of the at least two rows such that the wide end of the distal staple pocket of the first staple pocket set is longitudinally aligned with the narrow end of the proximal staple pocket of the second staple pocket set.
3. The surgical stapler device of claim 2, wherein the first one of the at least two rows is adjacent to the second one of the at least two rows in a direction transverse to the longitudinal axis.
4. The surgical stapler device of claim 2. wherein the first staple pocket set and the second staple pocket set are longitudinally offset.
5. The surgical stapler device of claim 4, wherein the first staple pocket set and the second staple pocket set are longitudinally offset by one half of a center-to-center pitch of one of the staple pocket sets.
6. The surgical stapler device of claim 2, wherein each staple pocket has a generally triangular shape foot print.
7. The surgical stapler device of claim 2, wherein the distal staple pocket and the proximal staple pocket of each staple pocket set are disposed in mirrored relation.
8. The surgical stapler device of claim 2, wherein each staple pocket includes a curved canyon floor adapted to form one of the proximal and distal staple legs of one of the plurality of staples into an arc.
9. The surgical stapler device of claim 2, wherein each staple pocket includes walls along which one of the proximal and distal staple legs of one of the plurality of staples is guided, the walls being steeply angled with respect to a tissue contact surface of the anvil portion.
10. The surgical stapler device of claim 2, wherein a centerline is defined between the narrow end and the wide end of each staple pocket, the narrow end of each staple pocket extending to an apex, the apex being disposed along the centerline, the centerline disposed in parallel with the longitudinal axis.
11. An anvil for use with a surgical stapling device, the anvil comprising:
a pair of rows of staple pockets, each row of the pair of rows of staple pockets extending longitudinally and including at least one staple pocket set dimensioned to receive and form staple, each staple pocket set including a distal staple pocket spaced apart from a proximal staple pocket, the distal staple pocket dimensioned to receive and form a distal staple leg or the staple, the proximal staple pocket dimensioned to receive and form a proximal staple leg of the staple, each staple pocket defined between a wide end and a narrow end, wherein the distal staple pocket of a first staple pocket set of a first one or the pair of rows is longitudinally aligned with the proximal staple pocket of a second staple pocket set of a second one of the pair of rows such that the wide end of the distal staple pocket of the first staple pocket set is longitudinally aligned with the narrow end of the proximal staple pocket of the second staple pocket set.
12. The anvil of claim 11, wherein the first staple pocket set and the second staple pocket set are longitudinally offset.
13. The anvil of claim 12, wherein the first staple pocket set and the second staple pocket set are longitudinally offset by one half of a center-to-center pitch of the first staple pocket set.
14. The anvil of claim 11, wherein each staple pocket has a generally triangular shape foot print.
15. The anvil of claim 11, wherein the distal staple pocket and the proximal staple pocket are disposed in mirrored relation.
16. The anvil of claim 11, wherein each staple pocket includes a curved canyon floor adapted to form one of the proximal and distal staple legs of the staple into an arc.
17. The anvil of claim 11, wherein each staple pocket includes walls along which one of the proximal and distal staple legs of the staple is guided, the walls being steeply angled with respect to a tissue contact surface of the anvil.
18. The anvil of claim 11, wherein a centerline is defined between the narrow end and the wide end of each staple pocket, the narrow end of each staple pocket extending to an apex, the apex being disposed along the centerline, the centerline in parallel with a knife slot defined through the anvil.
19. The anvil or claim 18, wherein a first pair of rows of staple pockets are defined on a first side of the knife slot and a second pair of rows of staple pockets are defined on a second side of the knife slot.
US14/134,524 2005-07-27 2013-12-19 Staple pocket arrangement for surgical stapler Abandoned US20140103091A1 (en)

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US11/495,011 US7815092B2 (en) 2005-07-27 2006-07-27 Staple pocket arrangement for surgical stapler
US12/849,986 US8636193B2 (en) 2005-07-27 2010-08-04 Staple pocket arrangement for surgical stapler
US14/134,524 US20140103091A1 (en) 2005-07-27 2013-12-19 Staple pocket arrangement for surgical stapler

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