System and method for performing ablation and other medical procedures using an electrode array with flex circuit

• US 20060100618A1
• Filed: 11/08/2005
• Published: 05/11/2006
• Est. Priority Date: 11/08/2004
• Status: Abandoned Application

• Current Assignee: Rui Xing Ltd.
• Original Assignee: Cardima, Inc.
• Inventors: Chan, Eric K.Y., Vegh, Gabriel
• Application Number:
  US11/268,941
• Publication Number:
  US 20060100618A1
• Time in Patent Office: Days
• US Class Current: 606/41
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2017/00084 Temperature

Abstract

An ablation catheter having distal and proximal ends for performing ablation on a human tissue region comprises at least one electrode. These elements are formed on a conductive sheet situated at the distal end of the catheter. A flex circuit assembly couples the at least one electrode to a measurement and power circuit attached to the proximal end of the catheter. The measurement and power circuit supplies power to the at least one electrode via the flex circuit.

Claims

1. A catheter having distal and proximal ends for performing ablation on a human tissue region comprising:

at least one electrode for performing ablation on human tissue formed from etching a conductive material and situated at a distal end of the catheter;

a flex circuit assembly coupling the at least one electrode to a measurement and power circuit attached to a proximal end of the catheter, the measurement and power circuit supplying power to the at least one electrode via the flex circuit.

2. The catheter of claim 1 further comprising at least one thermal sensing element that is formed from etching the conductive material and situated on the distal end of the catheter and wherein the at least one thermal sensing element supplies information indicative of thermal conditions of the contacting tissue region to the measurement and power circuit.

3. The catheter of claim 2 wherein the at least one electrode is capable of emitting energy to change tissue and wherein the at least one electrode provides information indicative of electrical conditions of a contacting tissue region to the measurement and power circuit.

4. The catheter of claim 1 wherein the at least one electrode is selected from a group comprising:

an etched electrode and a coiled electrode.

5. The catheter of claim 1 wherein the flex circuit assembly comprises a plurality of identical flex circuit sub-portions.

6. The catheter of claim 5 wherein the sub-portions are formed into a cylindrical shape.

7. The catheter of claim 5 wherein the measurement and power circuit comprises a PC board, an energy source, and monitoring control circuits for energy delivery.

8. The catheter of claim 1 wherein the at least one electrode is coated with a conductive gel and an anti-coagular gel.

9. The catheter of claim 2 wherein the at least one thermal sensing element comprises gold bands and copper-constantan junctions.

10. The catheter of claim 1 wherein the flex assembly comprises conductive circuit elements that are insulated from each other.

11. The catheter of claim 1 wherein the assembly comprises multiple flex-circuit layers.

12. A method for constructing a catheter and using the catheter for ablation comprising:

forming a plurality of flex sheets, connecting the flex sheets, and rolling the connected flex sheets to form a cylinder assembly;

adhering pins along a surface of the cylinder assembly, the pins coupled to flex circuitry positioned on the flex sheets; and

coupling electrodes to the pins; and

transmitting energy through the flex circuitry of the flex sheets to the electrodes in order to perform ablation on human tissue.

13. The method of claim 12 wherein coupling electrodes comprises coupling electrodes selected from a group comprising:

etched electrodes and coiled electrodes.

14. The method of claim 12 further comprising coupling at least one thermocouple banding along the surface of the cylinder assembly.

15. The method of claim 14 further comprising attaching a PC board connection at a proximal end of the cylinder and attaching a PC board to a power and measurement and control circuit.

16. The method of claim 12 further comprising covering the electrodes with a conductive gel.

17. The method of claim 12 further comprising infusing the electrodes with anti-coagulant chemicals that are time released during the course of an ablation procedure.

18. A catheter having distal and proximal ends for performing medical procedures on a human tissue region comprising:

at least one etched electrode and at least one thermocouple sensor situated at the distal end of the catheter;

a flex circuit assembly comprising identical multiple flex sheet portions and coupling the at least one etched electrode and the at least one thermocouple sensor to a measurement and power circuit attached to the proximal end of the catheter, the measurement and power circuit supplying power to the at least one etched electrode via the flex circuit to perform ablation, the assembly formed into a cylinder; and

wherein the at least one thermocouple sensor supplies information indicative of conditions of the human tissue region to the measurement and power circuit.

19. The catheter of claim 18 wherein the measurement and power circuit comprises a PC board, an energy source, and monitoring and control circuits for energy delivery.

20. The catheter of claim 18 wherein the medical procedures comprise ablation procedures.