Medical retrieval basket with legs shaped to enhance capture and reduce trauma

• US 20030078593A1
• Filed: 11/22/2002
• Published: 04/24/2003
• 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: Riley, James W., Bates, James S.
• Granted Patent: US 7,018,385 B2
• Time in Patent Office: Days
• 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 17/32056 Surgical snare instruments for removing or smashing calculi A61B2017/2212; tonsillotomes A61B17/26
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop

Abstract

A medical retrieval device, and related method, uses a basket formed by one or more legs to retrieve material such as calculi. At least one of the legs has at least an inner and an outer surface. The outer surface is an atraumatic surface such as a curved surface. The atraumatic surface can include one or more radii. The inner surface can be flat such that the leg has a D-shaped cross section. Other shapes are possible for the inner surface including a pointed shape that enhances the basket'"'"'s stone crushing or breaking ability. The inner surface, whatever its shape, can have a rough surface (e.g., serrated, etched, toothed, etc.) for further enhancing the basket'"'"'s ability to capture stones and other calculi.

Claims

1. A medical retrieval device, comprising:

a basket including one or more legs forming the basket, at least one of the legs comprising at least two surfaces wherein at least one of the two surfaces comprises a curved surface.

2. The device of claim 1 wherein the leg comprising the at least two surfaces has a cross section defined by the surfaces.

3. The device of claim 2 wherein the cross section comprises a D-shape defined by the surfaces wherein the curved surface comprises an outer surface and the other surface comprises an inner surface.

4. The device of claim 2 wherein the curved surface comprises an outer surface and the at least one other surface comprises an inner surface.

5. The device of claim 4 wherein the inner surface comprises a flat surface such that the cross section comprises a D-shape.

6. The device of claim 4 wherein the inner surface comprises at least one point.

7. The device of claim 4 wherein the inner surface comprises a surface that is rougher than the outer surface.

8. The device of claim 4 wherein the inner surface is rough.

9. The device of claim 8 wherein the rough inner surface comprises a serrated surface.

10. The device of claim 8 wherein the rough inner surface comprises a toothed surface.

11. The device of claim 8 wherein the rough inner surface comprises an etched surface.

12. The device of claim 2 wherein the curved surface comprises more than one radius.

13. The device of claim 1 wherein the basket includes at least three legs.

14. The device of claim 4 wherein the inner surface comprises a concave surface such that the cross section comprises a crescent shape.

15. A medical retrieval device, comprising:

a basket including one or more legs forming the basket, at least one of the legs comprising at least an inner surface and an outer surface wherein the outer surface comprises an atraumatic surface.

16. The device of claim 15 wherein the outer atraumatic surface comprises a curved surface.

17. The device of claim 16 wherein the inner surface comprises a flat surface such that the leg has a D-shaped cross section defined by the flat and curved surfaces.

18. The device of claim 15 wherein the inner surface comprises a surface that is rougher than the outer atraumatic surface.

19. The device of claim 15 wherein the inner surface is rough.

20. The device of claim 19 wherein the rough inner surface comprises a serrated surface.

21. The device of claim 19 wherein the rough inner surface comprises a toothed surface.

22. The device of claim 19 wherein the rough inner surface comprises an etched surface.

23. The device of claim 16 wherein the curved surface comprises more than one radius.

24. The device of claim 15 wherein the basket includes at least three legs.

25. A method for retrieving material from a body, comprising:

inserting an extractor into a body, the extractor comprising a basket having one or more legs forming the basket wherein at least one of the legs comprises at least an inner surface and an outer surface wherein the outer surface comprises an atraumatic surface;

capturing the material with the basket such that the captured material contacts the inner surface of at least one of the legs; and

withdrawing the extractor from the body to remove the captured material from the body.

26. The method of claim 25 wherein the step of capturing the material comprises capturing a calculus.

27. The method of claim 26 wherein the step of capturing the calculus comprises capturing a kidney stone.

28. The method of claim 26 wherein the step of capturing the calculus comprises capturing a ureteral stone.

29. The method of claim 26 wherein the step of capturing the calculus comprises capturing a bladder stone.

30. The method of claim 26 wherein the step of capturing the calculus comprises capturing a stone in the biliary tree.

31. The method of claim 25 wherein the capturing step further comprises breaking the material into two or more pieces with the basket.

32. A medical retrieval device, comprising:

a basket including one or more legs forming the basket, at least one of the legs comprising at least an inner surface having at least a portion adapted to contact material, the portion of the inner surface being a rough surface.

33. The device of claim 32 wherein the rough inner surface comprises a serrated surface.

34. The device of claim 32 wherein the rough inner surface comprises a toothed surface.

35. The device of claim 32 wherein the rough inner surface comprises an etched surface.