Surgical stapling device with tiltable anvil head

• US 7,364,060 B2
• Filed: 10/18/2004
• Issued: 04/29/2008
• Est. Priority Date: 10/17/2003
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Tyco Healthcare Group LP (Medtronic Plc)
• Inventors: Milliman, Keith L.
• Primary Examiner(s): Nash; Brian D.
• Application Number:
  US10/968,722
• Publication Number:
  US 20050116009A1
• Time in Patent Office: 1,289 Days
• Field of Search: 227/19, 227/175.1, 227/177.1, 227/179.1, 606/8, 606/144
• US Class Current: 227/175.1
• CPC Class Codes: A61B 17/068 Surgical staplers , e.g. containing multiple staples or clampsstaplers containing only one staple A61B17/10; magazines or containers for staples A61B17/105; for performing anastomosis A61B17/115; staplers in general B25C5/00
• CPC Class Codes: A61B 17/072 for applying a row of staples in a single action , e.g. the staples being applied simultaneously
• CPC Class Codes: A61B 17/1155 Circular staplers comprising a plurality of staples
• CPC Class Codes: A61B 17/32053 Punch like cutting instruments, e.g. using a cylindrical or oval knife A61B17/326 takes precedence; trepans A61B17/1695; for use on the cornea A61F9/007
• CPC Class Codes: A61B 2017/00367 Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
• CPC Class Codes: A61B 2017/00473 Distal part, e.g. tip or head A61B2017/00464 takes precedence
• CPC Class Codes: A61B 2017/07214 Stapler heads
• CPC Class Codes: A61B 2017/0725 with settable gap between anvil and cartridge, e.g. for different staple heights at different shots
• CPC Class Codes: A61B 2017/07257 characterised by its anvil
• CPC Class Codes: A61B 2090/0814 Preventing re-use

Abstract

A surgical stapling device including a self-righting anvil assembly is disclosed. The anvil assembly includes an anvil center rod and a pivotable anvil head. The surgical stapling device includes an anvil retainer assembly having a locking member in the form of a trocar for moving the anvil head from its tilted position to its operative position upon attachment of the anvil assembly to the stapling device. A cam member is provided to retain the locking member in a first or locked position and, thus, the anvil head in the operative position until after the stapling device has been fired.

Claims

1. A surgical stapling device comprising:

a handle assembly including an approximation knob and a firing trigger;

an elongated body portion extending distally from the handle assembly;

a head portion including an anvil assembly and a shell assembly, the shell assembly housing a plurality of staples and the anvil assembly including an anvil head and an anvil center rod, the anvil head being pivotally secured to the anvil center rod about a pivot axis and being movable between an operative position and a tilted position;

an anvil retainer assembly configured to releasably engage the anvil assembly, the anvil retainer assembly including a locking member which is movable from a first position in which the anvil head is moved to or retained in the operative position to a second position in which the anvil head is able to pivot from the operative position to the tilted position;

wherein the anvil retainer assembly includes a body portion defining a longitudinal bore having an open distal end and a trocar, the trocar extending from the open distal end of the body portion and forming the locking member, the trocar being movable along the longitudinal bore between an advanced position and a retracted position, the advanced position defining the first position of the locking member and the retracted position defining the second position of the locking member; and

wherein the trocar is urged to the retracted position by a trocar biasing member.

2. A surgical stapling device according to claim 1, wherein the trocar biasing member for urging the trocar to the retracted position is a coil spring.

3. A surgical stapling device according to claim 2, wherein the proximal end of the trocar includes an annular flange and the longitudinal bore defines a shoulder, the trocar biasing member being positioned within the longitudinal bore about the trocar between the annular flange of the trocar and the shoulder defined within the longitudinal bore to urge the trocar to the retracted position.

4. A surgical stapling device according to claim 1, further including a cam member supported on the body portion, the cam member being movable from a first position for retaining the trocar in the advanced position to a second position for allowing the trocar to move to the retracted position.

5. A surgical stapling device according to claim 4, wherein the cam member is pivotally secured to the body portion.

6. A surgical stapling device according to claim 5, wherein the cam member is pivotally supported within a longitudinal slot formed in the body portion.

7. A surgical stapling device according to claim 5, wherein the cam member includes a distal finger and a proximally located recess, the distal finger being positioned to engage a pin supported on the proximal end of the trocar when the cam member is in its first position to retain the trocar in the advanced position against the urging of the trocar biasing member.

8. A surgical stapling device according to claim 7, wherein the distal finger of the cam member includes an angled face such that engagement between the pin and the angled face urges the cam member to its second position.

9. A surgical stapling device according to claim 8, further including a pusher operably associated with a firing trigger of the handle assembly, the firing trigger being actuable to advance the pusher within the elongated body portion from a retracted position to an advanced position to eject the plurality of staples from the shell assembly.

10. A surgical stapling device according to claim 9, wherein the pusher includes at least one arm, the arm being positioned to prevent movement of the cam member from its first position to its second position until after the firing trigger has been actuated to move the pusher to its advanced position.

11. A surgical stapling device comprising:

a handle assembly including an approximation knob and a firing trigger;

an elongated body portion extending distally from the handle assembly;

a head portion including an anvil assembly and a shell assembly, the shell assembly housing a plurality of staples and the anvil assembly including an anvil head and an anvil center rod, the anvil head being pivotally secured to the anvil center rod about a pivot axis and being movable between an operative position and a tilted position;

an anvil retainer assembly configured to releasably engage the anvil assembly, the anvil retainer assembly including a locking member which is movable from a first position in which the anvil head is moved to or retained in the operative position to a second position in which the anvil head is able to pivot from the operative position to the tilted position; and

wherein the anvil assembly includes first and second slide members movably supported by the anvil center rod, the first slide member being pivotally connected to the anvil head on one side of the pivot axis by a first drive link and the second slide member being connected to the anvil head on the other side of the pivot axis by a second drive link, the first slide member being movable in relation to the second slide member to effect movement of the anvil head between the operative position and the tilted position;

further including a biasing member for urging the first and second slide members in relation to each other to position the anvil head in the tilted position;

wherein the first and second slide member biasing member is positioned between the first and second slide members to urge the first and second slide members apart.