Surgical staplers and staple

• US 4,391,401 A
• Filed: 01/26/1981
• Issued: 07/05/1983
• Est. Priority Date: 04/03/1979
• Status: Expired due to Fees

• Current Assignee: Lawrence M. Smith
• Original Assignee: Lawrence M. Smith
• Inventors: Moshofsky, Jerome F.
• Primary Examiner(s): Bell, Paul A.
• Application Number:
  US06/228,620
• Time in Patent Office: 890 Days
• Field of Search: 128/92 B, 128/334 R, 128/355.5, 72/410, 206/343, 206/345, 206/346, 227/19, 227/82, 227/83, 227/85, 227/87, 227/92, 227/120, 227/124, 227/129, 227/132, 227/140, 227/134, 227/DIG. 1
• US Class Current: 227/19
• CPC Class Codes: A61B 17/0684 having a forming anvil staying above the tissue during stapling

Abstract

The specification discloses a forming die or ram movable along a guideway or track by a pair of toggle-joint linkages to move from a column of staples a staple having a downwardly bowed central portion into engagement with an anvil, then bend outer portions down over the anvil to drive pointed legs into the flesh and bring the legs into alignment with each other. The column of staples is pressed by a spring arm and a follower toward the track and is laterally supported in a staple magazine. Each toggle-joint linkage is a one-piece member with two rigid arms connected by an undulating spring portion. The magazine is detachably connected to the track by spring latches or clips. Another stapler has a hook-like anvil, and the bowed central portion of the staple as it is pressed against the anvil by a forming die or ram, is first straightened and then bent legs are bent from the central portion, thus giving a "soft" initial feel to the stapling.

Claims

1. A surgical stapler comprising:

an elongate body having forward and rearward ends, and having a longitudinally extending guideway opening through its forward end;

a ram having a forming end portion and being mounted in said guideway with said forming end portion adjacent the forward end of the body for sliding movement along the guideway between a forward position with its forming end portion at said forward end and a retracted position with its forming end portion spaced from said forward end;

staple-holding means attached to said body for feeding a staple into said guideway when said ram is in its retracted position;

at least one toggle-joint linkage, said toggle-joint linkage comprising first and second arms of generally equal length, said arms having adjacent ends pivotally attached together with the end of said first arm opposite said adjacent ends being pivotally attached to said body adjacent its rearward end and the end of said second arm opposite said adjacent ends projecting toward the forward end of said body and being pivotally attached to said ram, the adjacent ends of the arms of said toggle-joint linkage being opposed and projecting away from said body when said ram is in its retracted position so that pressing the adjacent ends of the arms of said toggle-joint linkage in a direction transverse of said guideway will move said ram from its retracted to its forward position; and

an anvil fixed to the forward end of said body and projecting across said guideway, said anvil and the forming end portion of said ram being shaped to close a staple therebetween upon movement of said ram to its forward position.

2. A surgical stapler according to claim 1 wherein said ram has a substantially greater width than thickness in directions normal to said longitudinally extending guideway, and said toggle-joint linkage is attached to said body and said ram so that the adjacent ends of said arms move in a direction gradually parallel to the width of said ram upon pressing of said adjacent ends toward each other.