Surgical stapler with splaying mechanism

• US 7,753,250 B2
• Filed: 11/25/2008
• Issued: 07/13/2010
• Est. Priority Date: 03/08/2007
• Status: Active Grant

• Current Assignee: Aesculap AG (B. Braun Holding GmbH & Co. KG)
• Original Assignee: Cardica Incorporated
• Inventors: Knodel, Bryan D., Clauson, Luke W., Newell, Matthew B., Matthias, Benjamin J.
• Primary Examiner(s): Smith; Scott A.
• Application Number:
  US12/323,309
• Publication Number:
  US 20090072006A1
• Time in Patent Office: 595 Days
• Field of Search: 227/19, 227/176.1, 227/175.2, 227/175.1, 227/82, 227/88
• US Class Current: 227/176.1
• CPC Class Codes: A61B 17/0644 penetrating the tissue, deformable to closed position
• CPC Class Codes: A61B 17/0684 having a forming anvil staying above the tissue during stapling

Abstract

One example of a surgical stapler may include a pusher, at least one generally planar staple, where the pusher holds at least one staple, and a splay arm that includes spaced-apart splay fingers extending generally distally, where at least one splay finger includes a splay tip extending therefrom, and where relative motion of said pusher and said splay fingers causes said at least one said splay tip to engage and then splay at least one said staple. Another example of a surgical stapler may include a plurality of staples positioned out of contact with one another; a pusher that engages each staple; and at least one splay tip, each splay tip configured to contact a distal surface of the distalmost staple. Another example of a surgical stapler may include a plurality of staples, a pusher that holds the staples, the pusher having a longitudinal axis and being slidable longitudinally both proximally and distally substantially along that longitudinal axis, where the pusher is substantially constrained against motion away from the longitudinal axis; and a splay arm movable in a direction away from the longitudinal axis, from a position in which the splay arm contacts one staple to a position in which the splay arm no longer contacts that staple.

Claims

1. A surgical stapler, comprising:

a pusher;

at least one generally planar staple, wherein said pusher holds at least one said staple; and

a splay arm that includes spaced-apart splay fingers extending generally distally;

wherein

at least one splay finger includes a splay tip extending therefrom; and

wherein

relative motion of said pusher and said splay fingers causes said at least one said splay tip to engage and then splay at least one said staple;

wherein said pusher includes a camming bump extending therefrom toward said splay arm.

2. The surgical stapler of claim 1, wherein said splay arm is biased proximally.

3. The surgical stapler of claim 1, wherein at least the distal end of said splay arm is biased toward said pusher.

4. The surgical stapler of claim 1, further comprising a driver, wherein relative motion of said driver and at least one said staple causes said driver to contact and close said at least one said staple.

5. The surgical stapler of claim 1, further comprising an anti-backup rack, wherein said at least one staple is located between said anti-backup rack and said pusher.

6. The surgical stapler of claim 5, wherein said anti-backup rack includes a plurality of tines oriented downward and distally.

7. The surgical stapler of claim 1, wherein at least one said staple is plastically deformable.

8. The surgical stapler of claim 1, wherein at least one said staple is a substantially continuous solid having at least two tines, each said tine oriented at least partially in the distal direction both before and after relative motion of said pusher and said splay fingers splays said at least one staple.

9. A surgical stapler, comprising:

a plurality of staples positioned out of contact with one another;

a pusher that engages each said staple; and

at least one splay tip, each said splay tip configured to contact a distal surface of the distalmost of said plurality of staples;

wherein said pusher includes a camming bump extending therefrom, and wherein said camming bump is configured to move said splay tips relative to said pusher as said pusher moves longitudinally.

10. The surgical stapler of claim 9, wherein said pusher is generally planar, further comprising at least one tab extending upward and distally therefrom, wherein said tab engages a proximal surface of a corresponding said staple.

11. The surgical stapler of claim 10, wherein at least one said tab is biased upward.

12. The surgical stapler of claim 10, wherein said pusher is movable proximally relative to said plurality of staples, and wherein during said proximal motion of said pusher each said tab moves from a position distal to a corresponding said staple underneath said staple to a position proximal to said corresponding said staple.

13. The surgical staple of claim 12, further comprising an anti-backup rack, wherein said anti-backup rack engages each said staple during said proximal motion of said pusher to prevent each said staple from moving substantially proximally.

14. The surgical stapler of claim 13, wherein said anti-backup rack includes a plurality of tines oriented downward and distally, wherein each said tine engages a proximal surface of a corresponding said staple to restrain said staple substantially against proximal motion.

15. A surgical stapler, comprising:

a plurality of staples;

a pusher that holds said staples, said pusher having a longitudinal axis and said pusher slidable longitudinally both proximally and distally substantially along said longitudinal axis, wherein said pusher is substantially constrained against motion away from said longitudinal axis; and

a splay arm movable in a direction away from said longitudinal axis, from a position in which said splay arm contacts one said staple to a position in which said splay arm no longer contacts said staple;

wherein said splay arm includes a plurality of splay fingers extending therefrom, wherein said splay fingers initially engage a corresponding said staple and are located in the same plane as said pusher, and wherein said splay fingers then move downward out of plane relative to said pusher.

16. The surgical stapler of claim 15, wherein said pusher includes a camming bump extending therefrom and oriented toward said pusher, and wherein said splay arm includes an aperture defined therein, said splay arm biased toward said pusher such that motion of said camming bump into said aperture allows said splay arm to move toward said pusher, and wherein motion of said camming bump out of said aperture onto said splay arm pushes said splay arm away from said pusher.

17. The surgical stapler of claim 15, further comprising a housing in which at least a portion of said splay arm and said pusher are held, said housing including at least one ramp defined therein;

wherein said splay arm includes at least one ear;

wherein motion of said splay arm relative to said housing causes each said ear to engage a corresponding said ramp and thereby move said splay arm away from said pusher.