Releasable basket and method of making thereof

• US 7,169,154 B1
• Filed: 05/24/2000
• Issued: 01/30/2007
• Est. Priority Date: 05/25/1999
• Status: Expired due to Term

• Current Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Bates, James S., Que, Like, Teague, James A., Ward, Tim, Gobron, Ste
• Primary Examiner(s): TRUONG, KEVIN THAO
• Application Number:
  US09/979,166
• Time in Patent Office: 2,442 Days
• Field of Search: 606/127, 606/113, 606/114, 606/200, 606/1
• US Class Current: 606/127
• 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 2017/2215 having an open distal end
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

A medical retrieval device includes a basket formed of two or more loops. The basket may be used to retrieve material (e.g., a urinary stone) from a body. The basket opens and closes for end-encapsulation of a stone and is strengthened by support members that interconnect the basket loops. A captured stone may be released from the basket with the basket still in the body by opening the loops.

Claims

1. A medical retrieval device comprising:

a proximal handle;

a sheath extending distally from the handle and including a lumen extending therethrough from a distal end of the sheath to a proximal end of the sheath;

opposing first and second hemi-baskets, each hemi-basket comprising a loop and a back stay, the opposing first and second hemi-baskets having a collapsed position in which the first and second hemi-baskets are collapsed within the lumen of the sheath and another position in which the first and second hemi-baskets extend from the distal end of the inner sheath and out of the lumen, the first and second hemi-baskets being joined at a base and unattached to each other at their distal ends, the first and second hemi-baskets being moveable between an open position and a closed position with the first and second hemi-baskets being closer together at their distal ends when in the closed position than when in the open position to allow capture and release of material.

2. The medical retrieval device of claim 1, wherein the back stay of at least one hemi-basket extends in a first plane and the loop of the at least one hemi-basket extends in a second plane, the first and second planes being substantially perpendicular to each other.

3. The medical retrieval device of claim 1, further including an elongated member joined to the base.

4. The medical retrieval device of claim 3, wherein the elongated member is disposed within the lumen of the sheath.

5. The medical retrieval device of claim 3, wherein the elongated member is configured to assist in transitioning the first and second hemi-baskets between the open and closed positions through axial movement of the elongated member relative to the sheath.

6. The medical retrieval device of claim 1, wherein the sheath is configured to assist in transitioning the first and second hemi-baskets between the open and closed positions through axial movement of the sheath relative to the first and second hemi-baskets.

7. The medical retrieval device of claim 1, wherein the loop and the back stay of at least one of the hemi-baskets are formed of the same piece of material.

8. The medical retrieval device of claim 7, wherein the loop and the back stay of the at least one hemi-basket are formed by one of stamping, etching, and cutting.

9. The medical retrieval device of claim 1, wherein the loop and the back stay of the at least one hemi-basket are formed from a substantially T-shape configuration.

10. The medical retrieval device of claim 1, wherein at least one of the first and second hemi-baskets comprises at least two wires.

11. The medical retrieval device of claim 10, wherein at least one of the loop and the back stay of at least one of the hemi-baskets comprises at least two wires.

12. The medical retrieval device of claim 11, wherein the back stay of the at least one hemi-basket comprises two wires twisted together.

13. The medical retrieval device of claim 12, wherein the loop of the at least one hemi-basket comprises untwisted lengths of the two wires.

14. The medical retrieval device of claim 13, wherein the loop of the at least one hemi-basket comprises a third wire twisted with the two untwisted lengths of the two wires.

15. The medical retrieval device of claim 10, wherein the back stay of at least one of the hemi-baskets comprises a first wire twisted on itself and the loop of the at least one hemi-basket passes through an end of the first wire.

16. The medical retrieval device of claim 1, wherein free ends of the loop and back stay of at least one of the first and second hemi-baskets are twisted together to form an elongated member.

17. The medical retrieval device of claim 1, wherein free ends of the loop and back stay of at least one of the first and second hemi-baskets extend substantially adjacent to each other proximal the base of the at least one hemi-basket.

18. A medical retrieval device comprising:

a proximal handle;

a sheath extending distally from the handle and including a lumen extending therethrough from a distal end of the sheath to a proximal end of the sheath; and

opposing first and second hemi-baskets, each hemi-basket comprising a loop and a back stay, the first and second hemi-baskets being joined at a base and moveable in a clam shell fashion between an open position and a closed position with the first and second hemi-baskets being closer together at their distal ends when in the closed position, wherein the back stay of at least one hemi-basket extends in a first plane and the loop of the at least one hemi-basket extends in a second plane, the first and second planes being substantially perpendicular to each other.

19. The medical retrieval device of claim 18, wherein the loop and the back stay of the at least one hemi-basket are formed from a substantially T-shape configuration.

20. The medical retrieval device of claim 18, wherein at least one of the first and second hemi-baskets comprises at least two wires.

21. The medical retrieval device of claim 18, wherein at least one of the loop and the back stay of at least one of the hemi-baskets comprises at least two wires.

22. The medical retrieval device of claim 21, wherein the back stay of the at least one hemi-basket comprises two wires twisted together.

23. The medical retrieval device of claim 22, wherein the loop of the at least one hemi-basket comprises untwisted lengths of the two wires.

24. A medical retrieval device comprising:

a proximal handle;

a sheath extending distally from the handle and including a lumen extending therethrough from a distal end of the sheath to a proximal end of the sheath; and

opposing first and second hemi-baskets, each hemi-basket comprising a loop and a back stay, the first and second hemi-baskets being joined at a base and moveable in a clam shell fashion between an open position and a closed position with the first and second hemi-baskets being closer together at their distal ends when in the closed position, wherein the back stay of at least one hemi-basket comprises two wires twisted together and the loop of the at least one hemi-basket comprises untwisted lengths of the two wires.

25. The medical retrieval device of claim 24, wherein the loop and the back stay of the at least one hemi-basket are formed from a substantially T-shape configuration.

26. The medical retrieval device of claim 24, wherein free ends of the loop and back stay of at least one of the first and second hemi-baskets are twisted together to form an elongated member.

27. The medical retrieval device of claim 24, wherein free ends of the loop and back stay of at least one of the first and second hemi-baskets extend substantially adjacent to each other proximal the base of the at least one hemi-basket.

28. A medical retrieval device comprising:

a proximal handle;

a sheath extending distally from the handle and including a lumen extending therethrough from a distal end of the sheath to a proximal end of the sheath; and

opposing first and second hemi-baskets, each hemi-basket comprising a loop and a back stay, the first and second hemi-baskets being joined at a base and moveable in a clam shell fashion between an open position and a closed position with the first and second hemi-baskets being closer together at their distal ends when in the closed position, wherein the back stay of at least one of the hemi-baskets comprises a first wire twisted on itself and the loop of the at least one hemi-basket passes through an end of the first wire.

29. The medical retrieval device of claim 28, wherein the loop and the back stay of the at least one hemi-basket are formed from a substantially T-shape configuration.

30. The medical retrieval device of claim 28, wherein the back stay of at least one hemi-basket extends in a first plane and the loop of the at least one hemi-basket extends in a second plane, the first and second planes being substantially perpendicular to each other.

31. The medical retrieval device of claim 28, wherein free ends of the loop and back stay of at least one of the first and second hemi-baskets are twisted together to form an elongated member.

32. The medical retrieval device of claim 28, wherein free ends of the loop and back stay of at least one of the first and second hemi-baskets extend substantially adjacent to each other proximal the base of the at least one hemi-basket.