Surgical stapler with lockout mechanism

• US 5,718,359 A
• Filed: 08/14/1995
• Issued: 02/17/1998
• Est. Priority Date: 08/14/1995
• Status: Expired due to Term

• Current Assignee: United States Surgical Corporation (Medtronic Plc)
• Original Assignee: United States Surgical Corporation (Medtronic Plc)
• Inventors: Palmer, Mitchell J., McClure, Richard C.
• Primary Examiner(s): Smith, Scott A.
• Application Number:
  US08/514,636
• Time in Patent Office: 918 Days
• Field of Search: 227/175.1, 227/175.2, 227/175.3, 227/175.4, 227/176.1, 227/19
• US Class Current: 227/175.2
• CPC Class Codes: A61B 17/07207 the staples being applied sequentially
• CPC Class Codes: A61B 2090/038 during shipment
• CPC Class Codes: A61B 2090/0801 Prevention of accidental cutting or pricking
• CPC Class Codes: A61B 2090/0814 Preventing re-use

Abstract

An apparatus for applying surgical fasteners is disclosed which includes a first lockout mechanism configured to prevent premature ejection of fasteners during shipment, and a second lockout mechanism to prevent reactuation of the apparatus after it has once been actuated.

Claims

1. A surgical apparatus comprising:

a) a cartridge supporting portion having a cartridge supported therein which contains a plurality of surgical fasteners and a plurality of pushers configured to eject the surgical fasteners from the cartridge;

b) an anvil supporting portion relatively movable with respect to the cartridge supporting portion and having an anvil surface against which the surgical fasteners are driven when they are ejected from the cartridge;

c) a cam bar retainer operatively associated with the cartridge and retaining at least two cam bars configured to sequentially interact with the pushers as the cam bar retainer translates distally from a pre-fired proximal position;

d) an actuator connected to the cam bar retainer for facilitating the translation thereof;

e) a first locking member extending from the actuator and configured to releasably engage a notch provided in the cartridge supporting portion to maintain the cam bar retainer in the pre-fired proximal position; and

f) a second locking member supported on the cam bar retainer and configured to engage an aperture provided within the cartridge supporting portion upon retraction of the cam bar retainer to a post-fired proximal position.

2. A surgical apparatus as recited in claim 1, further comprising an elongated carrier channel supported within the cartridge supporting portion and carrying the cartridge, the cam bar retainer, and the cam bars.

3. A surgical apparatus as recited in claim 2, wherein the first locking member includes a retention bar which cooperates with a release button pivotably mounted to the actuator.

4. A surgical apparatus as recited in claim 3, wherein the release button has a camming surface configured to displace the retention bar to release the retention bar from the notch.

5. A surgical apparatus as recited in claim 2, wherein the notch is formed in a side wall of the carrier channel adjacent a proximal end thereof.

6. A surgical apparatus as recited in claim 5, wherein the second locking member includes a ramped tab extending from the cam bar retainer.

7. A surgical apparatus as recited in claim 6, wherein the aperture is defined in a clasp portion formed integral with the carrier channel.

8. A surgical apparatus as recited in claim 7, wherein the clasp portion includes first and second apertures, wherein the ramped tab is positioned in the first aperture when the cam bar retainer is in the pre-fired proximal position and is positioned in the second aperture proximal of the first aperture when the cam bar retainer is retracted to a post-fired proximal position.

9. A surgical apparatus as recited in claim 2, wherein the carrier channel is removably mounted in the cartridge supporting portion.

10. A surgical apparatus comprising:

a) an elongated carrier channel;

b) a cartridge disposed in a distal portion of the carrier channel and containing a plurality of surgical fasteners and a plurality of pushers configured to eject the surgical fasteners from the cartridge body;

c) a cam bar retainer disposed within the carrier channel and configured to translate therein in a longitudinal direction;

d) an actuator connected to the cam bar retainer for facilitating the longitudinal translation thereof;

e) at least two elongated cam bars retained by the cam bar retainer and configured to sequentially interact with the pushers as the cam bar retainer translates in a longitudinal direction; and

f) a shipping lock pivotally mounted to the actuator and configured to releasably engage the carrier channel to maintain the cam bar retainer in a pre-fired proximal position to prevent movement of the cam bar retainer during shipping.

11. A surgical apparatus as recited in claim 10 further comprising a firing locking mechanism extending from the cam bar retainer and configured to lockingly engage a clasp depending from the carrier channel to maintain the cam bar retainer in a post-fired proximal position.

12. A surgical apparatus as recited in claim 11, wherein the clasp is formed integral with the carrier channel and includes an aperture for receiving and retaining the locking mechanism.

13. A surgical apparatus as recited in claim 12, wherein the clasp includes first and second apertures and, wherein the locking mechanism is positioned in the first aperture when the cam bar retainer is in the pre-fired proximal position and is positioned in the second aperture proximal of the first aperture when the cam bar retainer is retracted to the post-fired proximal position.

14. A surgical apparatus as recited in claim 10, wherein the shipping lock includes a release button pivotably mounted to the actuator.

15. A surgical apparatus as recited in claim 14, wherein the shipping lock includes a retention bar cooperating with the pivoting release button.

16. A surgical apparatus as recited in claim 15, wherein the release button has a camming surface configured to displace the retention bar to release the cam bar retainer.

17. A surgical apparatus as recited in claim 10, further comprising a notch formed in a side wall of the carrier channel adjacent a proximal end thereof for releasably retaining the shipping lock when the cam bar retainer is in the pre-fired proximal position.

18. A surgical apparatus as recited in claim 17, wherein the pre-fired proximal position is distal of the post-fired proximal position.

19. A surgical apparatus comprising:

a) a cartridge supporting portion having a cartridge disposed therein which contains a plurality of surgical fasteners and a plurality of pushers configured to eject the surgical fasteners from the cartridge;

b) an anvil supporting portion relatively movable with respect to the cartridge supporting portion and having an anvil surface against which the surgical fasteners are driven when they are ejected from the cartridge;

c) a cam bar retainer operatively associated with the cartridge and retaining at least two cam bars configured to sequentially interact with the pushers as the cam bar retainer translates distally from a pre-fired proximal position;

d) an actuator connected to the cam bar retainer for facilitating the translation thereof;

e) a clasp positioned in the cartridge supporting portion and having first and second slots; and

f) a detent extending from the cam bar retainer and positioned in the first slot when the cam bar retainer is in the pre-fired proximal position and positioned in the second slot when the cam bar retainer is retracted to a post-fired proximal position, wherein the engagement of the detent in the second slot prevents distal movement of the cam bar retainer.

20. A cartridge assembly as recited in claim 19, wherein in the post-fired proximal position of the cam bar retainer is proximal of the pre-fired proximal position.

21. A surgical apparatus as recited in claim 20, further comprising an elongated carrier channel supported within the cartridge supporting portion and carrying the cartridge, the cam bar retainer, and the cam bars.

22. A cartridge assembly as recited in claim 21, wherein the clasp is formed integral with the carrier channel.

23. A surgical apparatus as recited in claim 19, further comprising an interlock mechanism configured to maintain the cam bar retainer in a pre-fired proximal position so as to prevent premature actuation of the apparatus, the interlock mechanism including a release button pivotably mounted to the actuator.

24. A surgical apparatus as recited in claim 23, wherein the interlock mechanism includes a retention bar configured to releasably engage a notch provided in the carrier channel, and wherein the release button includes a camming surface configured to displace the retention bar from engagement with the notch.