Medical retrieval device

• US 20050055034A1
• Filed: 07/26/2004
• Published: 03/10/2005
• Est. Priority Date: 05/03/1996
• Status: Active Grant

• Current Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Bates, James S.
• Granted Patent: US 7,717,924 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 2017/2212 having a closed distal end, e.g. a loop

Abstract

Immobilization and/or retrieval of material from a body can be accomplished, in accordance with the invention, with a device that includes a sheath and a basket. The basket is movable relative to the sheath from a retracted position in which the basket is withdrawn within the sheath and an expanded position in which the basket is extended beyond the distal end of the sheath and open. The basket has a first portion and a second portion with two or more legs extending from the first portion to the second portion. The basket further includes an intermediate portion between the first and second portions in which the legs are spirally arranged, substantially parallel, and non-intersecting. The intermediate portion of the basket is displaced radially outward relative to the first and second portions when the basket is in the expanded position. The basket in the expanded position may be used to immobilize and/or capture material within a body.

Claims

1. A device for retrieving material from a body, comprising:

a sheath having a lumen extending therethrough and having a distal end; and

a basket movable relative to the sheath from a retracted position in which the basket is withdrawn within the lumen of the sheath and an expanded position in which the basket is extended beyond the distal end of the sheath and open, the basket comprising a first portion and a second portion with two or more legs extending from the first portion to the second portion, the basket further comprising an intermediate portion between the first and second portions in which the legs are spirally arranged, substantially parallel, and non-intersecting, the intermediate portion being displaced radially outward relative to the first and second portions when the basket is in the expanded position.

3. The device of claim 1 wherein each of the legs in the intermediate portion is spaced about 0.0787 inches to 0.394 inches away from the next leg.

4. The device of claim 1 further comprising:

an elongate member extending within the lumen of the sheath and operably attached to the basket such that relative movement between the elongate member and the sheath results in the basket moving between the expanded and the retracted positions.

2. A device for retrieving material from a body, comprising:

a sheath having a lumen extending therethrough and having a distal end; and

a basket movable relative to the sheath from a retracted position in which the basket is withdrawn within the lumen of the sheath and an expanded position in which the basket is extended beyond the distal end of the sheath and open, the basket comprising a first portion and a second portion with two or more legs extending from the first portion to the second portion, the basket further comprising an intermediate portion between the first and second portions in which the legs are spirally arranged, substantially parallel, and non-intersecting, the intermediate portion being displaced radially outward relative to the first and second portions when the basket is in the expanded position;

whereby the basket in the expanded position provides a surface for the material when it is being fragmented and allows the fragmented material to enter into and be captured by the basket.

5. A method for retrieving material from a body comprising:

inserting into a body tract a device comprising a sheath and a basket movable relative to the sheath from a retracted position in which the basket is withdrawn within the sheath and an expanded position in which the basket is extended beyond a distal end of the sheath and open, the basket comprising a first portion and a second portion with two or more legs extending from the first portion to the second portion, the basket further comprising an intermediate portion between the first and second portions in which the legs are spirally arranged, substantially parallel, and non-intersecting, the intermediate portion being displaced radially outward relative to the first and second portions when the basket is in the expanded position;

immobilizing material in the body tract by moving the basket from the retracted position to the expanded position whereby the material is blocked;

fragmenting the material in the body tract and using the expanded basket to limit movement of the material during fragmentation;

capturing at least some of the fragmented material within the basket; and

recovering at least some of the fragmented material within the basket by withdrawing the device with the captured fragmented material from the body tract.