Retrieval device with laser cut basket

• US 20070288037A1
• Filed: 06/09/2006
• Published: 12/13/2007
• Est. Priority Date: 06/09/2006
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Teague, James A., Cheng, Eric
• Granted Patent: US 7,837,693 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 2017/00526 Methods of manufacturing
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop

Abstract

A medical device includes a sheath defining a lumen, and an elongate member movably disposed within the lumen. The elongate member includes a basket having a plurality of legs, at least one leg of the plurality of legs is disposed between adjacent first and second slots defined by the elongate member. A first distal relief feature at a distal end of the first slot is longitudinally offset from a second distal relief feature at a distal end of the second slot.

Claims

1. A medical device, comprising:

a sheath defining a lumen; and

an elongate member movably disposed within the lumen, the elongate member including a basket having a plurality of legs, at least one leg of the plurality of legs being disposed between adjacent first and second slots defined by the elongate member, wherein a first distal relief feature at a distal end of the first slot is longitudinally offset from a second distal relief feature at a distal end of the second slot.

2. The medical device of claim 1, wherein the elongate member and the basket are formed from a single piece of a material.

3. The medical device of claim 1, wherein the first and second slots extend substantially longitudinally along the elongate member.

4. The medical device of claim 1, wherein the first and second slots are formed by removing portions of the elongate member.

5. The medical device of claim 1, wherein at least one of the relief features is an extension of a corresponding slot.

6. The medical device of claim 1, wherein at least one of the relief features is a widened end of a corresponding slot.

7. The medical device of claim 1, wherein at least one of the relief features is an opening in a wall of the elongate member.

8. The medical device of claim 7, wherein the at least one relief feature has a width greater than a width of a corresponding slot.

9. The medical device of claim 1, wherein a first proximal relief feature is disposed at a proximal end of the first slot and a second proximal relief feature is disposed at a proximal end of the second slot, the first proximal relief feature being longitudinally offset from the second proximal relief feature.

10. The medical device of claim 9, wherein the first proximal relief feature has a first width dimension, the first distal relief feature has a second width dimension, and the first slot has a third width dimension, the first and second width dimensions being larger than the third width dimension.

11. The medical device of claim 9, wherein the first distal relief feature is substantially completely proximal the second distal relief feature and the first proximal relief feature is substantially completely distal the second proximal relief feature.

12. The medical device of claim 9, wherein the first distal relief feature is substantially completely proximal the second distal relief feature and the first proximal relief feature is substantially completely proximal the second proximal relief feature.

13. The medical device of claim 9, further including a third slot defined by the elongate member and disposed adjacent to at least one of the first slot and the second slot, a third distal relief feature at a distal end of the third slot being longitudinally offset from an adjacent distal relief feature.

14. The medical device of claim 13, wherein the third distal relief feature is substantially completely proximal the second distal relief feature, and a third proximal relief feature at a proximal end of the third slot is substantially completely proximal the second proximal relief feature.

15. The medical device of claim 1, wherein the basket comprises at least four legs.

16. The medical device of claim 1, wherein the basket comprises a predetermined shape in an expanded position.

17. The medical device of claim 1, wherein the elongate member is substantially hollow.

18. A medical retrieval device basket, comprising:

a plurality of legs, each of the legs being defined by at least two slots of an elongate member, a first distal relief feature being disposed at a distal end of a first slot and a second distal relief feature being disposed at a distal end of a second slot, wherein the first slot is adjacent the second slot, and the first distal relief feature is longitudinally offset from the second distal relief feature.

19. The medical device of claim 18, wherein the at least two slots extend substantially longitudinally along the elongate member.

20. The medical device of claim 18, wherein the at least two slots are formed by removing portions of the elongate member.

21. The medical device of claim 18, wherein at least one of the relief features is an extension of a corresponding slot.

22. The medical device of claim 18, wherein at least one of the relief features is a widened end of a corresponding slot.

23. The medical device of claim 18, wherein at least one of the relief features is an opening in a wall of the elongate member.

24. The medical device of claim 23, wherein the at least one relief feature has a width greater than a width of a corresponding slot.

25. The medical device of claim 18, wherein a first proximal relief feature at a proximal end of the first slot has a first width dimension, the first distal relief feature has a second width dimension, and the first slot has a third width dimension, the first and second width dimensions being larger than the third width dimension.

26. The medical device of claim 25, wherein the first distal relief feature is substantially completely proximal the second distal relief feature, and the first proximal relief feature is substantially completely distal a second proximal relief feature at a proximal end of the second slot.

27. The medical device of claim 25, wherein the first distal relief feature is substantially completely proximal the second distal relief feature and the first proximal relief feature is substantially completely proximal a second proximal relief feature at a proximal end of the second slot.

28. The medical device of claim 18, further including a third slot defined by the elongate member and disposed adjacent to at least one of the first slot and the second slot, a third distal relief feature at a distal end of the third slot being longitudinally offset from an adjacent distal relief feature.

29. The medical device of claim 28, wherein the third distal relief feature is substantially completely proximal the second distal relief feature, and a third proximal relief feature at a proximal end of the third slot is substantially completely proximal a second proximal relief feature at a proximal end of the third slot.

30. The medical device of claim 18, wherein the basket comprises at least four legs.

31. The medical device of claim 18, wherein the basket comprises a predetermined shape in an expanded position.

32. The medical device of claim 18, wherein the elongate member is substantially hollow.

33. A method of manufacturing a medical device, comprising:

removing longitudinal portions of a piece of material to form a basket having a plurality of legs defined by slots; and

removing second portions of the piece of material to form a first distal relief feature at a distal end of a first slot and a second distal relief feature at a distal end of a second slot, the first distal relief feature being longitudinally offset from the second distal relief feature, and the first slot being adjacent to the second slot.

34. The method of claim 33, wherein removing longitudinal portions of the piece of material includes one of laser cutting, chemical etching, die cutting, and mechanically slicing.

35. The method of claim 33, wherein removing second portions of the piece of material includes one of laser cutting, chemical etching, die cutting, and mechanically slicing.

36. The method of claim 33, wherein removing second portions of the piece of material further includes forming a first proximal relief feature at a proximal end of the first slot and a second proximal relief feature at a proximal end of the second slot, the first proximal relief feature being longitudinally offset from the second proximal relief feature.

37. The method of claim 36, wherein the first proximal relief feature has a first width dimension, the first distal relief feature has a second width dimension, and the first slot has a third width dimension, the first and second width dimensions being larger than the third width dimension.

38. The method of claim 36, wherein the first distal relief feature is substantially completely proximal the second distal relief feature, and the first proximal relief feature is substantially completely distal the second proximal relief feature.

39. The method of claim 36, wherein the first distal relief feature is substantially completely proximal the second distal relief feature and the first proximal relief feature is substantially completely proximal the second proximal relief feature.

40. The method of claim 36, further including forming a third slot defined by the elongate member and disposed adjacent to at least one of the first slot and the second slot, a third distal relief feature at a distal end of the third slot being longitudinally offset from an adjacent distal relief feature.

41. The method of claim 40, wherein the third distal relief feature is substantially completely proximal the second distal relief feature, and a third proximal relief feature at a proximal end of the third slot is substantially completely proximal the second proximal relief feature.

42. The method of claim 33, wherein the basket comprises at least four legs.

43. A method of removing matter from the body of a patient, comprising:

providing a medical device including a sheath defining a lumen, and an elongate member movably disposed within the lumen, the elongate member including a basket having a plurality of legs, at least one leg of the plurality of legs being disposed between adjacent first and second slots defined by the elongate member, wherein a first distal relief feature at a distal end of the first slot is longitudinally offset from a second distal relief feature at a distal end of the second slot;

advancing the medical device to a treatment site within the body of the patient;

capturing the matter within the basket of the device; and

removing the medical device from the body of the patient.

44. The method of claim 43, further including immobilizing the matter with the plurality of legs of the basket.

45. The method of claim 43, further including reducing the size of the matter.

46. The method of claim 43, further including sweeping at least a portion of the matter from the treatment site with the plurality of legs of the basket.

47. The method of claim 43, wherein the matter is one of a kidney stone, a struvite, a uric acid stone, a cystine stone, and a solid deposit.

48. The method of claim 43, wherein a first proximal relief feature is disposed at a proximal end of the first slot and a second proximal relief feature is disposed at a proximal end of the second slot, the first proximal relief feature being longitudinally offset from the second proximal relief feature.

49. The method of claim 48, wherein the first proximal relief feature has a first width dimension, the first distal relief feature has a second width dimension, and the first slot has a third width dimension, the first and second width dimensions being larger than the third width dimension.

50. The method of claim 48, wherein the first distal relief feature is substantially completely proximal the second distal relief feature, and the first proximal relief feature is substantially completely distal the second proximal relief feature.

51. The method of claim 48, wherein the first distal relief feature is substantially completely proximal the second distal relief feature, and the first proximal relief feature is substantially completely proximal the second proximal relief feature.

52. The method of claim 48, further including a third slot defined by the elongate member and disposed adjacent to at least one of the first slot and the second slot, a third distal relief feature at a distal end of the third slot being longitudinally offset from an adjacent distal relief feature.

53. The method of claim 52, wherein the third distal relief feature is substantially completely proximal the second distal relief feature and a third proximal relief feature at a proximal end of the third slot is substantially completely proximal the second proximal relief feature.