Releasable basket

• US 20030135233A1
• Filed: 02/03/2003
• Published: 07/17/2003
• Est. Priority Date: 10/01/1997
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Bates, James S., Teague, James A.
• Granted Patent: US 6,942,673 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• 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 2017/2215 having an open distal end

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 device for retrieving material from a body, comprising:

a proximal handle;

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

a basket moveable relative to the sheath between a withdrawn position in which the basket is collapsed within the lumen of the sheath, and an extended position in which the basket extends from the distal end of the sheath and is disposed outside of the lumen, and the basket having a base and a distal portion when in the extended position and comprising at least two loops which are joined at the base and which are unattached to each other at the distal portion of the basket, the loops being moveable when the basket is in the extended position between an open position and a closed position with the loops being closer together at the distal portion when in the closed position than when in the open position.

2. The device of claim 1 wherein the loops assume the open position automatically when the basket is moved relative to the sheath into the extended position.

3. The device of claim 1 further comprising at least one elongate member extending within the lumen from the handle to at least one of the loops for use in moving the loops between the open and closed positions.

4. The device of claim 1 wherein each of the loops comprise an inner surface and an outer surface.

5. The device of claim 4 wherein at least a portion of the inner surface of at least one of the loops comprises a concave surface.

6. The device of claim 4 wherein at least a portion of the inner surface of at least one of the two or more loops comprises a roughened surface.

7. The device of claim 6 wherein the roughened inner surface comprises a serrated surface.

8. The device of claim 6 wherein the roughened inner surface comprises an etched surface.

9. The device of claim 6 wherein the roughened inner surface comprises a toothed surface.

10. The device of claim 1 wherein the loops comprise flat wire.

11. The device of claim 1 further comprising a mesh or membrane disposed within each of the loops.

12. The device of claim 1 wherein the basket is formed from a single piece of material.

13. The device of claim 1 wherein the basket comprises stainless steel.

14. The device of claim 1 wherein the basket comprises a shape memory material.

15. The device of claim 2 further comprising one or more support members disposed between the loops to provide structural support to the basket.

16. The device of claim 1 wherein mechanisms for fragmenting or moving the material are deployable within the lumen.

17. The device of claim 1 wherein the loops are energizeable to delivery energy to excise tissue.

18. A method for retrieving biological materials from a body, comprising:

inserting a medical retrieval device into a body, the device comprising a proximal handle, a sheath extending distally from the handle and having a lumen extending therethrough from a distal end of the sheath to a proximal end of the sheath, and a basket moveable relative to the sheath between a withdrawn position in which the basket is collapsed within the lumen of the sheath, and an extended position in which the basket extends from the distal end of the sheath and is disposed outside of the lumen, and the basket having a base and a distal portion when in the extended position and comprising at least two loops which are joined at the base and which are unattached to each other at the distal portion of the basket, the loops being moveable when the basket is in the extended position between an open position and a closed position with the loops being closer together at the distal portion when in the closed position than when in the open position;

extending the basket from the sheath and moving the basket loops from a closed position to an open position;

capturing the biological material within the basket;

retracting the loops into the sheath wherein the unattached ends of the loops are juxtaposed thereby moving the basket to a substantially closed position; and

withdrawing the device from the body to remove the biological material from the body.

19. The method of claim 19 wherein the capturing step further comprises breaking the biological material into two or more pieces within the basket.

20. The method of claim 19 wherein the step of capturing the biological material comprises capturing a calculus or a stone.

26. The method of claim 19 wherein the step of capturing the biological material comprises a polypectomy.

27. The method of claim 19 wherein the step of capturing the biological material comprises a biopsy procedure.

21. The method of claim 21 wherein the step of capturing the biological material comprises capturing a kidney stone.

22. The method of claim 21 wherein the step of capturing the biological material comprises capturing a ureteral stone.

23. The method of claim 21 wherein the step of capturing the biological material comprises capturing a urinary bladder stone.

24. The method of claim 21 wherein the step of capturing the biological material comprises capturing a gall bladder stone.

25. The method of claim 21 wherein the step of capturing the biological material comprises capturing a stone within the biliary tree.

28. A method for manufacturing a medical retrieval basket, comprising:

removing a flat, substantially oval template from a single piece of construction material, the template being symmetrical and having a first end and a second end, the first end and the second end being oppositely disposed;

folding the template such that the first and second ends of the template are brought together; and

securing together the two ends of the template.

29. A method for manufacturing a medical retrieval basket, comprising:

removing a flat template from a single piece of construction material, the template being symmetrical and having two ends;

folding the template such that the two ends of the template are superimposed to form basket loops; and

securing together the superimposed ends of the template.

30. The method of claim 30 further comprising applying an anti-slip material to at least one surface of the template.

31. The method of claim 30 further comprising roughening at least one surface of the template.