Surgical stapler cartridge lockout device

• US 4,892,244 A
• Filed: 11/07/1988
• Issued: 01/09/1990
• Est. Priority Date: 11/07/1988
• Status: Expired

• Current Assignee: Ethicon Incorporated (Johnson & Johnson)
• Original Assignee: Ethicon Incorporated (Johnson & Johnson)
• Inventors: Nuchols, Richard P., Nobis, Rudolph H., Zeiner, Mark S., Fox, William D.
• Primary Examiner(s): Watts, Douglas D.
• Assistant Examiner(s): Wolfe, James L.
• Application Number:
  US07/267,907
• Time in Patent Office: 428 Days
• Field of Search: 227/19, 227/121, 227/DIG. 1, 227/8, 227/120, 128/334 R
• US Class Current: 227/175.4
• 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 17/07207 the staples being applied sequentially
• CPC Class Codes: A61B 2017/07214 Stapler heads
• CPC Class Codes: A61B 2017/2945 Curved jaws
• CPC Class Codes: A61B 2090/0814 Preventing re-use
• CPC Class Codes: B25C 5/1686 using pre-loaded cassettes

Abstract

A lockout mechanism actuable upon the firing of staples in a surgical staple cartridge such that the lockout mechanism prevents the refiring of the spent staple cartridge when that cartridge remains loaded within the surgical stapler. In addition, the lockout mechanism will prevent reloading of a spent staple cartridge within a surgical stapler after the spent staple cartridge has been removed from the surgical stapler.

Claims

1. In a surgical stapler having firing means for firing staples and in which a removable cartridge containing staples may be loaded and replaced by another removable cartridge, a lockout mechanism on said stapler actuable by said firing means upon the firing of said staples by said stapler such that said lockout mechanism blocks said firing means and prevents the refiring of said stapler when loaded with said spent cartridge.

2. The stapler of claim 1, said lockout mechanism further being spring loaded before the firing of said staples, such that upon said firing, said spring is actuated by contact between said firing means and said lockout mechanism to cause said lockout mechanism to enter said firing means path after retraction of said firing means to prevent the refiring of said firing means into said spent cartridge.

3. In a cartridge containing surgical staples and a path wherein a firing means from a surgical stapler can move in order to fire said stapler, a lockout mechanism comprising a firing barrier loaded by a first spring, said barrier preloaded on said cartridge before the insertion of said cartridge into a surgical stapler, said first spring actuable upon the firing of said stapler by said firing means located on said stapler, such that said barrier is caused by said first spring to move into said path to prevent the refiring of said staples loaded with said spent cartridge.

4. The lockout mechanism of claim 3 further comprising a reloading barrier movable between a firing position in which said reloading barrier is loaded by a second spring, and a blocking position, such that the firing of said firing means activates said second spring to cause said reloading barrier to pass from said firing position to said blocking position, said reloading barrier in said blocking position capable of preventing the reloading of said spent cartridge in any stapler upon the removable of said spent cartridge from said stapler.

5. The lockout mechanism of claim 4 further comprising an indicator flag actuable upon the firing of said staples to indicate said firing.

6. In a staple cartridge insertable within a surgical stapler and containing staples and comprising an elongated body including one or more longitudinal slots for slidably receiving one or more longitudinal pusher bars comprising a firing mechanism of said surgical stapler, and a plurality of drivers engageable by said pusher bars for ejecting the staples from the cartridge, said staple cartridge releasably fastened to a said surgical stapler, the improvement comprising a lockout mechanism connected to said longitudinal slots for preventing said pusher bars from passing more than one time through said longitudinal slots.

7. In the staple cartridge of claim 6, the lockout mechanism comprising a strip slidable within said cartridge comprising:

a front end emplaced within a narrow hollow located toward the front of said cartridge, said front end comprising a folded spring loaded strip such that said pusher bars can contact said front end and cause said front end to slide further toward the front of said cartridge such that said spring is actuated to open within said hollow; and

a spring loaded barrier lock located on the rear end of said strip, said barrier lock placed under a detent means within said cartridge in order to avoid contact with said pusher bars, said barrier lock loosened from said detent means upon the sliding of said front end, such that said barrier lock moves within the path of said pusher bars to prevent said pusher bars from passing within said cartridge upon the retraction of said pusher bars from said cartridge.

8. In the staple cartridge of claim 7, said cartridge held within a narrow channel of said stapler, said cartridge having parallel side walls fitting within said narrow channel, the improvement further comprising a lockout spring attached to the side walls of said cartridge, said lockout spring comprising a resilient ear held in place by a cover moved by said pusher bars upon the actuation of said stapler to expose said ear, such that said ear becomes urged outside the width of said channel upon the removal of said cartridge, to prevent reinsertion of said spent cartridge within said channel.

9. The staple cartridge of claim 8 wherein said cover is pivotable within said cartridge such that the pivoting of said cover causes the exposing of said ears.

10. In the staple cartridge of claim 8, the improvement further comprising an indicator flag actuable by said folded spring loaded strip to emerge from said hollow upon the firing of staples.

11. In the staple cartridge of claim 6, the improvement comprising a spring loaded bar emplaced within and held by said drivers such that when said pusher bar engages said drivers to activate said staples and said pusher bar is retracted from said cartridge, said spring loaded bar moves into the path of said pusher bars to prevent motion of said pusher bars with said cartridge.

12. In the cartridge of claim 11, the lockout mechanism further comprising said spring loaded bar having a resting position beyond the width of said cartridge upon the firing of said staples, the activation of said bar and the removal of said cartridge from said stapler, such that said bar prevents the reinsertion of said cartridge into said stapler.