Radio frequency lasso

Patent metadata

Field	Value
Publication number	US-9333026-B2
Application number	US-28292805-A
Country	US
Kind code	B2
Filing date	Nov 18, 2005
Priority date	Nov 18, 2005
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

A system for resecting tissue includes a loop structure configured for cutting tissue, at least a portion of the loop structure formed by an elongate structure having a first end and a second end, wherein a length of the loop structure is adjustable by positioning the first end relative to the second end, wherein a first portion of the loop structure comprises a first electrode, and a second portion of the loop structure comprises a second electrode. A system for resecting tissue includes a loop structure configured for cutting tissue, the loop structure formed by an elongate structure having a first end and a second end, wherein a length of the loop structure is adjustable by positioning the first end relative to the second end, and a support structure coupled to a portion of the elongate structure and having a surface for contacting tissue.

First claim

What is claimed:

1. A system for resecting tissue, comprising:
a loop structure having a cutting portion configured for cutting tissue, at least a portion of the loop structure formed by an elongate structure having a proximal end and a distal end, wherein a length of the loop structure is adjustable by adjusting a position of the proximal end relative to a position of the distal end, wherein a loop is fixedly secured to the distal end of the elongate structure, and wherein a portion of the elongate structure is inserted through the loop;
a positioner for automatically reducing the loop size of the loop structure and cutting tissue with the cutting portion, wherein the positioner automatically reduces the loop size in response to a received signal; and
wherein a first portion of the loop structure comprises a plurality of electrodes including a first electrode, and a second portion of the loop structure comprises a second electrode.

2. The system of claim 1 , further comprising a sheath for housing at least a portion of the loop structure.

3. The system of claim 1 , further comprising an electrical energy generator, wherein the first electrode is electrically coupled to a first terminal of the generator, and the second electrode is electrically coupled to a second terminal of the generator, the system thereby configured to form a circuit via conduction of electrical energy through tissue between the first and second electrodes.

4. The system of claim 1 , further comprising an electrode pad configured for electrically coupling to an exterior body surface, wherein the first electrode and the second electrode are electrically coupled to each other and form a first pole of a circuit, and electrode pad forms a second pole of the circuit.

5. The system of claim 1 , wherein the first electrode is electrically isolated from the second electrode.

6. The system of claim 1 , further comprising at least one control circuit operatively coupled to the first electrode and the second electrode.

7. The system of claim 6 , wherein a first control circuit is operatively coupled to the first electrode and a second, separate control circuit is operatively coupled to the second electrode.

8. The system of claim 1 , the second portion of the loop structure comprising a plurality of electrodes.

9. The system of claim 1 , wherein the first electrode and the second electrode are configured in a bipolar manner.

10. The system of claim 1 , wherein the first electrode and the second electrode are shaped differently.

11. The system of claim 1 , wherein the first electrode and the second electrode are separated from one another by an insulator.

12. The system of claim 1 , wherein the proximal end of the elongate structure comprises a plurality of teeth along a portion thereof, said positioner comprising a motor-driven gear operatively interfacing with the plurality of teeth.

13. The system of claim 12 , further comprising
a sensing electrode disposed on the loop structure; and
a processor operatively coupled to the sensing electrode via a signal wire, the processor configured to operate the motor-driven gear in response to the received signal, wherein the received signal is received from the sensing electrode.

14. The system of claim 1 , further comprising a shaft having a distal end and a lumen, wherein part of the elongate structure extends through the shaft lumen, and wherein the loop secured to the distal end of the elongate structure is coupled to the shaft distal end.

15. The system of claim 1 , wherein the loop extends distally from a distalmost end of the elongate structure.

16. The system of claim 1 , wherein the second portion of the loop structure is directly coupled to the loop, and the first portion of the loop structure is slidable through the loop.

17. A system for resecting tissue, comprising:
a loop structure having a cutting portion configured for cutting tissue, at least a portion of the loop structure formed by an elongate structure having a proximal end and a distal end, wherein a length of the loop structure is adjustable by adjusting a position of the proximal end relative to a position of the distal end, wherein a loop is fixedly secured to the distal end of the elongate structure, and wherein a portion of the elongate structure is inserted through the loop;
a positioner for automatically reducing the loop size of the loop structure and cutting tissue with the cutting portion, wherein the positioner automatically reduces the loop size in response to a received signal; and
wherein a first portion of the loop structure comprises a first electrode, and a second portion of the loop structure comprises a second electrode, wherein the first portion of the loop structure has a cross-sectional dimension that is less than a cross-sectional dimension of the second portion of the loop structure.

18. The system of claim 17 , wherein the loop extends distally from a distalmost end of the elongate structure.

19. A system for resecting tissue, comprising:
a loop structure having a cutting portion configured for cutting tissue, at least a portion of the loop structure formed by an elongate structure having a proximal end and a distal end, wherein a length of the loop structure is adjustable by adjusting a position of the proximal end relative to a position of the distal end, wherein a loop is fixedly secured to the distal end of the elongate structure, and wherein a portion of the elongate structure is inserted through the loop;
a positioner for automatically reducing the loop size of the loop structure and cutting tissue with the cutting portion, wherein the positioner automatically reduces the loop size in response to a received signal; and
wherein a first portion of the loop structure comprises a first electrode, and a second portion of the loop structure comprises a second electrode, wherein the first electrode and the second electrode are configured in a monopolar manner.

20. The system of claim 19 , wherein the loop extends distally from a distalmost end of the elongate structure.

Assignees

• Girard Mark E
• Casey Tom
• Young Kimbolt
• Murphy Nathan
• Rioux Robert F
• Boston Scient Scimed Inc

Inventors

• Girard Mark E
• Casey Tom
• Young Kimbolt
• Murphy Nathan
• Rioux Robert F

Classifications

• A61B2018/143

  multiple needles · CPC title

• A61B2018/1432

  curved · CPC title

• A61B18/14 Primary

  Probes or electrodes therefor · CPC title

• A61B2018/1475

  Electrodes retractable in or deployable from a housing · CPC title

• A61B2018/1407

  Loop · CPC title