Snare with Retractable Engaging Members

• US 20120172662A1
• Filed: 12/16/2011
• Published: 07/05/2012
• Est. Priority Date: 12/30/2010
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Kappel, Gary, Cheng, Ruth, Heller, Gerald, Stanton, Larry, Keene, Ken, Nguyen, Man
• Granted Patent: US 9,700,345 B2
• Time in Patent Office: Days
• US Class Current: 600/104
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 17/32056 Surgical snare instruments for removing or smashing calculi A61B2017/2212; tonsillotomes A61B17/26
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2017/00269 endoscopic mucosal resection EMR
• CPC Class Codes: A61B 2017/320064 with tissue or sample retaining means
• CPC Class Codes: A61B 2018/00601 Cutting
• CPC Class Codes: A61B 2018/141 Snare

Abstract

A snare for retrieving foreign objects within the body of a patient including a hollow elongate tubular member comprising an inner surface and an outer surface and a lumen defined by the inner surface, a proximal end and a distal end, the hollow elongate tubular member forms a loop at the distal end, the loop having an open position and a closed position, the loop comprising at least one opening and a wire slidably disposed in the lumen of the elongate tubular member, the wire comprising at least one engaging member for engaging tissue, the at least one engaging member extends through the at least one opening in the hollow elongate tubular member when the wire is in a first position and the at least one engaging member retracts into the lumen of the elongate tubular member when the wire moved to a in a second position.

Claims

1. A snare for retrieving foreign objects within the body of a patient, the snare comprising:

a hollow elongate tubular member comprising an inner surface and an outer surface and a lumen defined by the inner surface, a distal end and a proximal end, the hollow elongate tubular member forms a loop at the distal end, the loop comprising at least one opening, the loop having an open position and a closed position; and

a wire slidably disposed in the lumen of the elongate tubular member, the wire comprising at least one engaging member for engaging tissue, the at least one engaging member extends through the at least one opening and when the wire is in a first position the at least one engaging member is retractable into the lumen of the elongate tubular member when the wire moved to a in a second position.

2. The snare of claim 1 wherein said wire is a Nitinol wire.

3. The snare of claim 1 wherein said elongate tubular member comprises stainless steel.

4. The snare of claim 1 wherein said engaging members are in the form of hooks, barbs or needles.

5. The snare of claim 1 wherein said loop comprises an open loop or a closed loop configuration.

6. The snare of claim 1 further comprising a sheath extending from a proximal end which, in an operative position, is located outside the body, to a distal end which, in the operative position is located within the body, the sheath having an outer surface and an inner surface, the inner surface defining a lumen, the proximal end of the hollow elongate tubular member is in communication with a first actuator for moving the hollow elongate tubular member from a position wherein the loop of the hollow elongate tubular member is covered by the distal end of the sheath to a position wherein the loop of the hollow elongate tubular member is extended beyond the distal end of the sheath.

7. The snare of claim 6 comprising a second actuator coupled to the proximal end of the inner wire, the second actuator having a first position and a second position, when the second actuator is in the first position the wire is in the first position and the at least one engaging member extends through said at least one opening in said hollow elongate tubular member and when the second actuator is in the second position the wire is in the second position and the at least one engaging member is retractable into the lumen of the elongate tubular member.

8. The snare of claim 6 wherein the sheath is sized to be slidably received within a working channel of an endoscope.

9. The snare of claim 6 wherein the sheath is fixedly engaged to a first handle portion.

10. The snare of claim 9 wherein the first actuator is a second handle portion slidably engaged to the first handle portion.

11. The snare of claim 9 comprising a second actuator coupled to the proximal end of the inner wire, the second actuator having a first position and a second position, when the second actuator is in the first position the wire is in the first position, when the second actuator is in the second position the wire is in the second position, the second actuator is a third handle portion slidably engaged to the second handle portion.

12. The snare of claim 7 wherein the sheath is fixedly engaged to a first handle portion, the 1^st actuator is a second handle portion slidably engaged to the first handle portion and the second actuator is a third handle portion slidably engaged to the second handle portion.

13. The snare of claim 1 in combination with an endoscope.

14. The snare of claim 1 energized by an electrosurgical generator.

15. A snare for retrieving foreign objects within the body of a patient, the snare comprising:

a sheath extending from a proximal end which, in an operative position, is located outside the body, to a distal end which, in the operative position is located within the body, the sheath having an outer surface and an inner surface, the inner surface defining a lumen;

a hollow elongate tubular member disposed within the lumen of the sheath, the hollow elongate tubular member comprising an inner surface and an outer surface and a lumen defined by the inner surface, a proximal end and a distal end, the hollow elongate tubular member forming a loop at the distal end, the loop comprising at least one opening, the loop having an open position and a closed position;

a wire slidably disposed in the lumen of the elongate tubular member, the distal end of the wire comprising at least one engaging member for engaging tissue, the wire having a first position and a second position within the hollow elongate tubular member wherein when the wire is in the first position the at least one engaging member extends out of the at least one opening in the hollow elongate tubular member and when the wire is in the second position, the at least one engaging member is retractable within the lumen of the hollow elongate member.

16. The snare of claim 15 further comprising a first actuator coupled to the proximal end of the hollow elongate tubular member, the actuator having a first position and a second position, when the actuator is in the first position, the loop of the hollow elongate tubular member is disposed within the distal end of the sheath, when the actuator is in the second position the loop of the hollow elongate tubular member extends outside the distal end of the sheath.

17. The snare of claim 15 further comprising a second actuator coupled to the proximal end of the wire, the second actuator having a first position and a second position, when the actuator is in the first position the at least one engaging member extends out of the at least one opening of the hollow elongate tubular member and when the actuator is in the second position, the at least one engaging member is retractable within the lumen of the hollow elongate tubular member.

18. The snare of claim 15 wherein the proximal end of the sheath is coupled to a first handle.

19. The snare of claim 18 wherein the first actuator is a second handle slidably engaged to said first handle.

20. The snare of claim 19 wherein the second actuator is a third handle slidably engaged to said second handle.

21. The snare of claim 15 energized with an electrosurgical generator.

22. A snare for retrieving foreign objects within the body of a patient, the snare comprising:

a first handle portion;

a sheath having a proximal end and a distal end and an inner surface and an outer surface, the inner surface defining a lumen, the sheath engaged to the first handle portion at the proximal end, the distal end in an operative position is located inside the body of a patient and the proximal end is located outside the body of the patient;

a second handle portion slidably engaged with the first handle portion, the second handle portion having a first position and a second position;

a hollow elongate tubular member comprising an inner surface and an outer surface and a lumen defined by the inner surface, a proximal end and a distal end, the hollow elongate tubular member forming a loop at the distal end, the loop comprising at least one opening, the loop having an open position and a closed position, the hollow elongate tubular member extending through the lumen of the sheath, the hollow elongate tubular member is engaged to the second handle portion and when the second handle portion is in the first position, the hollow elongate tubular member is disposed entirely within the sheath, when the second handle portion is in the second position, the loop of the hollow elongate tubular member extends from the distal end of the sheath;

a third handle portion slidably engaged with the second handle portion, the third handle portion having a first position and a second position; and

a wire slidably disposed in the lumen of the elongate tubular member, the wire comprising at least one engaging member for engaging tissue, the wire having a proximal end and a distal end, the wire comprising at least one engaging member, the wire is engaged to the handle at the proximal end, when the handle is in a first position, the at least one engaging member extends through the at least one opening in the hollow elongate tubular member and when the wire is in a first position and the at least one engaging member retracts into the lumen of the elongate tubular member when the handle is moved to a second position.