Clamp applicator

• US 5,792,149 A
• Filed: 10/03/1996
• Issued: 08/11/1998
• Est. Priority Date: 10/03/1996
• Status: Expired due to Term

• Current Assignee: United States Surgical Corporation (Medtronic Plc)
• Original Assignee: United States Surgical Corporation (Medtronic Plc)
• Inventors: Sherts, Charles R., Yagami, Richard
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): PHAM, THUY D
• Application Number:
  US08/725,362
• Time in Patent Office: 677 Days
• Field of Search: 606/139, 606/142, 606/143, 606/144, 606/151, 227/901, 227/902
• US Class Current: 606/142
• CPC Class Codes: A61B 17/1227 Spring clips
• CPC Class Codes: A61B 17/1285 for minimally invasive surgery

Abstract

A clamp applicator is disclosed having a housing, a clamp support member extending distally from the housing, an actuator assembly and a locking device. The actuator assembly is movable with respect to the clamp support member into engagement with a clamp supported at the distal end of the clamp support member to bias the clamp to an open position. A locking device is provided to retain the actuator assembly in a position to maintain the clamp in the open position.

Claims

1. A clamp applicator for applying a resilient clamp having a normally closed position to body tissue, the clamp applicator comprising:

a) a housing;

b) a clamp support member positioned distally of the housing and configured to support a resilient clamp;

c) an actuator positioned around the clamp support member and being movably mounted in relation to the clamp support member, a biasing member operably associated with the actuator, wherein the actuator is configured to urge the resilient clamp from the normally closed position to an open position; and

d) a locking device operably associated with the actuator, the locking device being positioned to retain the actuator and clamp support member at relative positions to maintain a resilient clamp in the open position.

2. A clamp applicator according to claim 1, wherein the actuator is movable in relation to the clamp support member between a retracted position in which a resilient clamp is in the normally closed position and an advanced position in which a resilient clamp is in the open position.

3. A clamp applicator according to claim 1, wherein the clamp support member is fixed with respect to the housing, and the actuator is movable with respect to the housing and the clamp support member from a first position in which the resilient clamp is in the normally closed position to a second position in which a resilient clamp is biased to the open position.

4. A clamp applicator according to claim 3, wherein the actuator includes a tubular sleeve having a distal end, the tubular sleeve being linearly movable with respect to the clamp support member to move the distal end of the tubular sleeve into engagement with a resilient clamp to bias the resilient clamp from the normally closed position to the open position.

5. A clamp applicator according to claim 3, wherein the locking device includes a flexible retaining member having a base portion fixed to the housing and a locking member movable into operative engagement with the actuator to retain the actuator in the second position.

6. A clamp applicator according to claim 5, wherein the actuator includes a locking surface and a cam surface, wherein the locking member of the flexible retaining member is deflected along the cam surface as the actuator is moved from the first position to the second position, the locking member returning to an undeflected position into engagement with the locking surface of the actuator after passing over the cam surface.

7. A clamp applicator according to claim 6, wherein the retaining member has an engagement portion, the engagement portion being movable to move the locking member from engagement with the locking surface of the actuator, thus permitting is the biasing member to return the actuator to the first position to allow a resilient clamp to return to the normally closed position.

8. A clamp applicator for applying a resilient clamp having a normally closed position to body tissue, the clamp applicator comprising:

a) a housing;

b) a clamp support positioned distally of the housing and configured to support a resilient clamp;

c) an actuator movably mounted in relation to the clamp support member, a biasing member operably associated with the actuator, the actuator being configured to urge the resilient clamp from the normally closed position to an open position; and

d) a locking device operably associated with the actuator, the locking device being positioned to retain the actuator and clamp support member at relative positions to maintain a resilient clamp in the open position

wherein the clamp support member is fixed with rest to the housing, and the actuator is movable with respect to the housing and the clamp support member from a first position in which the resilient clamp is in the normally closed position to a second position in which a resilient clamp is biased to the open position, and

wherein the locking device includes a camming plate and a flexible locking member, the flexible locking member being movable into operative engagement with the camming plate to retain the actuator in the second position.

9. A clamp actuator according to claim 8, wherein the camming plate includes a first cam surface and a retention slot, the flexible locking member being movable into engagement with the first cam surface as the actuator is moved from the first position to the second position to bend the flexible locking member such that when the flexible locking member moves past the cam surface, the flexible locking member elastically moves into engagement with the retention slot.

10. A clamp applicator according to claim 9, wherein the locking device further includes a retaining member, the retaining member being positioned on the camming plate to direct the flexible locking member into the retention slot.

11. A clamp applicator according to claim 10, wherein the actuator includes a tubular actuation sleeve having a distal camming surface, the distal camming surface being movable into engagement with a resilient clamp to bias the resilient clamp from the normally closed position to the open position.

12. A clamp applicator according to claim 11, wherein the clamp support member includes a distally extending rod, the distally extending rod being positioned within the actuation sleeve and having a proximal end fixedly secured to the housing.

13. A clamp applicator according to claim 12, further including a resilient release member secured to the distal end of the distally extending rod, the resilient release member being positioned to assist in releasing a resilient clamp from the clamp support member clamp support post.

14. A clamp applicator for applying a resilient clamp having a normally closed position to body tissue, the clamp applicator comprising:

a) a housing;

b) a clamp support member extending distally from the housing and having a longitudinal axis, the clamp support member configured to support a resilient clamp;

c) an actuator movable relative to the clamp support member to bias the resilient clamp from the normally closed position to an open position; and

d) a locking device operably associated with the actuator, the locking device being movable to a locked position in which a resilient clamp is maintained in the open position;

wherein the actuator is movable in a first direction a first distance to move the locking device to the locked position and the actuator is movable in the first direction a second distance substantially shorter than the first distance to release the actuator and permit a resilient clamp to return to the normally closed position.

15. A clamp applicator according to claim 14, wherein the locking device includes a camming plate and a flexible locking member, the flexible locking member being movable over the first distance into the locked position in which the flexible locking member is in operative engagement with the camming plate.

16. A clamp applicator according to claim 15, wherein the camming plate includes a first cam surface and a retention slot, the flexible locking member being movable into engagement with the first cam surface as the actuator is moved over the first distance to bend the flexible locking member such that when the flexible locking member passes off the cam surface, the flexible locking member elastically moves into engagement with the retention slot.

17. A clamp applicator according to claim 16, further including a biasing member, the biasing member being operatively associated with the actuator to urge the actuator to a position to allow a resilient clamp to remain in an open position.

18. A clamp applicator according to claim 17, wherein the locking device further includes a retaining member, the retaining member being positioned on the camming plate to direct the flexible locking member into the retention slot.