Device for removing an elongated structure implanted in biological tissue

• US 20040153096A1
• Filed: 02/05/2003
• Published: 08/05/2004
• Est. Priority Date: 02/05/2003
• Status: Active Grant

• Current Assignee: Cook Medical Technologies, LLC (Cook Group Incorporated)
• Original Assignee: Cook Vascular Incorporated (Cook Group Incorporated)
• Inventors: Goode, Louis B., Lui, Chun K.
• Granted Patent: US 7,651,504 B2
• Time in Patent Office: Days
• US Class Current: 606/113
• 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 17/320016 Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes A61B10/0233, A61B17/29, A61B17/3207 take precedence
• CPC Class Codes: A61B 17/32056 Surgical snare instruments for removing or smashing calculi A61B2017/2212; tonsillotomes A61B17/26
• CPC Class Codes: A61B 2017/32004 having a laterally movable cutting member at its most distal end which remains within the contours of said end
• CPC Class Codes: A61N 2001/0578 having means for removal or extraction

Abstract

A snare-type device (10) for removing an elongated structure (54) such as, for example, a pacemaker lead. The device (10) first includes a sheath (12) having a first lumen (16) formed therein, the first lumen (16) having a distal end (24) and being dimensioned to receive the elongated structure (54) therein, and being adapted to allow advancement of the sheath (12) along the elongated structure (54). The sheath (12) also has second and third parallel lumens (28 and 36) formed therein, all of the first, second and third lumens (16, 28 and 36) being unitarily formed in the sheath (12). The device (10) also includes a snare (42) contained in the second and third lumens (28 and 36) in the sheath (12). The snare (42) has a snare loop (44 or 52) extending out of the second and third lumens (28 and 36), at and generally extending around the distal end (24) of the first lumen (16).

Claims

1. A device for removing an elongated structure implanted in biological tissue, comprising:

a sheath having a first wall defining a first lumen therein, the first lumen having a distal end and being dimensioned to receive the elongated structure therein, and being adapted to allow advancement of the sheath along the elongated structure, the sheath also having a second wall defining a second lumen therein; and

a snare contained in at least the second lumen in the sheath, the snare having a snare loop extending out of at least the second lumen, at and generally extending around the distal end of the first lumen in the sheath, the snare loop being closeable about the elongated structure when the elongated structure is received in the first lumen of the sheath.

2. The device according to claim 1, wherein the sheath has a distal end, and a recess in the distal end receiving the snare loop therein.

3. The device according to claim 1, wherein the sheath has a third wall defining a third lumen therein, and wherein the snare is contained in both the second lumen and the third lumen of the sheath.

4. The device according to claim 3, wherein the second lumen and the third lumen are coterminal with the sheath.

5. The device according to claim 3, wherein the second lumen and the third lumen are coterminal with the first lumen in the sheath.

6. The device according to claim 4, wherein the snare comprises one leg disposed in the second lumen and another leg disposed in the third lumen in the sheath.

7. The device according to claim 1, wherein the second lumen is coterminal with the sheath.

8. The device according to claim 1, wherein the second lumen is coterminal with the first lumen in the sheath.

9. The device according to claim 1, wherein the snare loop crosses over itself.

10. The device according to claim 1, wherein the snare includes a graspable pull opposite the snare loop.

11. The device according to claim 1, wherein the first lumen and the second lumen are disposed in parallel in the sheath.

12. The device according to claim 1, wherein the first lumen and the second lumen are unitarily formed in the sheath.

13. The device according to claim 1, wherein the second lumen in the sheath has a distal end, and wherein the snare loop depends generally perpendicularly from the distal end of the second lumen.

14. The device according to claim 1, wherein the snare is composed of a shape memory material.

15. The device according to claim 14, wherein shape memory material of the snare is nitinol alloy.

16. The device according to claim 1, wherein the snare loop is positioned so as to draw the elongated structure against the first wall of the sheath upon closure of the snare loop.

17. The device according to claim 1, wherein the sheath is tubular.

18. A device for removing an elongated structure implanted in biological tissue, comprising:

a sheath having a first wall defining a first lumen therein, the first lumen having a distal end and being dimensioned to receive the elongated structure therein, and being adapted to allow advancement of the sheath along the elongated structure;

the sheath also having second and third walls defining second and third parallel lumens therein, the second and third lumens being coterminal with the first lumen and the sheath, and all of the first, second and third lumens being unitarily formed in the sheath; and

a snare contained in the second and third lumens in the sheath, the snare having a snare loop extending out of the second and third lumens at and generally extending around the distal end of the first lumen in the sheath;

wherein the snare comprises one leg disposed in the second lumen and another leg disposed in the third lumen, the legs being connected to the snare loop, and a graspable pull connected to the legs of the snare opposite the snare loop; and

wherein the snare loop depends generally perpendicularly from distal ends of the second and third lumens, and is closeable about the elongated structure when the elongated structure is received in the first lumen of the sheath.

19. A method for removing an elongated structure implanted in biological tissue, carried out with a device comprising:

a sheath having a first wall defining a first lumen therein, the first lumen having a distal end and being dimensioned to receive the elongated structure therein, and being adapted to allow advancement of the sheath along the elongated structure, the sheath also having a second wall defining a second lumen therein; and

a snare contained in at least the second lumen in the sheath, the snare having a snare loop extending out of at least the second lumen, at and generally extending around the distal end of the first lumen in the sheath, the snare loop being closeable about the elongated structure when the elongated structure is received in the first lumen of the sheath;

the method comprising the steps of;

positioning the sheath of the device so that the elongated structure is received in the first lumen of the sheath; and

closing the snare loop about the elongated structure.