Atraumatic medical retrieval device

• US 20010001315A1
• Filed: 01/08/2001
• Published: 05/17/2001
• Est. Priority Date: 04/23/1998
• 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., Que, Like, Teague, James A.
• Granted Patent: US 6,527,781 B2
• Time in Patent Office: Days
• US Class Current: 606/114
• 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 2017/2212 having a closed distal end, e.g. a loop
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

Baskets with atraumatic distal tips allow the capture of material from difficult-to-reach areas of the body, while reducing the risk of tissue damage.

Claims

1. A medical retrieval device, comprising:

a sheath having a proximal end and a distal end;

a handle at the proximal end of the sheath; and

a basket for removing material from a body, the basket having a collapsed position where the basket is enclosed within the sheath and an expanded position where the basket extends from the distal end of the sheath, the basket comprising three or more legs, at least a distal end portion of the basket being defined by a shape which comprises a single continuous unit.

2. The medical retrieval device of

claim 1

wherein the distal end portion of the basket is non-perforated.

3. The medical retrieval device of

claim 1

wherein the shape is formed from a ceramic or ceramic composite material.

4. The medical retrieval device of

claim 1

wherein the shape is formed from a powdered metal.

5. The medical retrieval device of

claim 1

wherein the shape is formed from polymer.

6. The medical retrieval device of

claim 1

wherein the shape is formed from a metal alloy.

7. The medical retrieval device of

claim 1

wherein the length of the legs is about 0.5 inches to 3.5 inches, the width of the legs is about 0.005 inches to 0.015 inches, and the thickness of the legs is in the range of 0.028 inches to 0.045 inches.

8. The medical retrieval device of

claim 1

wherein the inner surface of said basket legs is textured.

9. A medical retrieval device, comprising:

a sheath having a proximal end and a distal end;

a handle at the proximal end of the sheath; and

a basket for removing material from a body, the basket having a collapsed position where the basket is enclosed within the sheath, and an expanded position where the basket extends from the distal end of the sheath, the basket comprising two or more pairs of basket legs, each pair of basket legs formed from a single wire loop, each wire loop comprising a protrusion at an apex of said wire loop where said wire loops intersect at a distal basket end, wherein said protrusions have a convex surface and a concave surface, and wherein said convex surface of one basket wire protrusion meets said concave surface of said intersecting basket wire protrusion.

10. The basket of

claim 9

further comprising a semi-circular protrusion.

11. The basket of

claim 9

wherein the basket legs are smoothly curved.

12. The basket of

claim 9

wherein the basket legs comprise a plurality of angles.

13. The basket of

claim 9

further comprising basket legs with cross-sectional shapes selected from the group consisting of D-shape, U-shape, B-shape, rectangular, round, half-round, oval or ribbon-like.

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

forming, as a single continuous unit, a shape having three or more legs; and

bending the legs of the shape to form at least a portion of a three-dimensional basket structure for retrieving objects.

15. The method of

claim 14

wherein forming the shape comprises stamping the shape from a continuous sheet of material.

16. The method of

claim 14

wherein forming the shape comprises etching the shape from a continuous sheet of material.

17. The method of

claim 14

wherein forming the shape comprises cutting the shape from a continuous sheet of material.

18. The method of

claim 14

wherein forming the shape comprises injection molding.

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

inserting an extractor into a body, the extractor including a basket having three or more legs forming the basket, wherein at least a distal end portion of the basket is defined by a shape which comprises a single continuous unit;

capturing the material within the basket; and

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

20. A method for retrieving material from a body, the method comprising the steps of:

inserting a retrieval device into a body, the retrieval device comprising a sheath having a proximal end and a distal end, a handle at the proximal end of the sheath, and a basket for removing material from a body, the basket having a collapsed position where the basket is enclosed within the sheath, and an expanded position where the basket extends from the distal end of the sheath, the basket comprising two or more pairs of basket legs, each pair of basket legs formed from a single wire loop, each wire loop comprising a protrusion at an apex of said wire loop where said wire loops intersect at a distal basket end, wherein said protrusions have a convex surface and a concave surface, and wherein said convex surface of one basket wire meets said concave surface of said intersecting wire protrusion;

capturing the material within the basket; and

withdrawing the retrieval device from the body to remove the captured material from the body.