MULTI-POLE SYNCHRONOUS PULMONARY ARTERY RADIOFREQUENCY ABLATION CATHETER

• US 20140180277A1
• Filed: 11/13/2013
• Published: 06/26/2014
• Est. Priority Date: 11/13/2012
• Status: Abandoned Application

• Current Assignee: PULNOVO MEDICAL (WUXI) CO., LTD.
• Original Assignee: PULNOVO MEDICAL (WUXI) CO., LTD.
• Inventors: Chen, Shaoliang
• Application Number:
  US14/079,230
• Publication Number:
  US 20140180277A1
• Time in Patent Office: Days
• US Class Current: 606/41
• CPC Class Codes: A61B 18/00 Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body eye surgery A61F9/007; ear surgery A61F11/00
• 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 2017/00323 Cables or rods
• CPC Class Codes: A61B 2017/00867 shape memory effect
• CPC Class Codes: A61B 2018/00029 open
• CPC Class Codes: A61B 2018/00166 Multiple lumina
• CPC Class Codes: A61B 2018/00214 Expandable means emitting energy, e.g. by elements carried thereon
• CPC Class Codes: A61B 2018/00375 Ostium, e.g. ostium of pulmonary vein or artery
• CPC Class Codes: A61B 2018/00404 Blood vessels other than those in or around the heart
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00791 Temperature
• CPC Class Codes: A61B 2018/00797 measured by multiple temperature sensors
• CPC Class Codes: A61B 2018/00821 measured by a thermocouple
• CPC Class Codes: A61B 2018/1407 Loop
• CPC Class Codes: A61B 2018/1467 using more than two electrodes on a single probe
• CPC Class Codes: A61B 2218/002 Irrigation
• CPC Class Codes: A61M 25/0147 with movable mechanical means, e.g. pull wires
• CPC Class Codes: A61N 1/06 for high-frequency therapy
• CPC Class Codes: A61N 2007/003 Destruction of nerve tissue
• CPC Class Codes: A61N 7/02 Localised ultrasound hyperthermia hyperthermia in general A61F7/00
• CPC Class Codes: F04C 2270/041 : Controlled or regulated

Abstract

A multi-pole synchronous pulmonary artery radiofrequency ablation catheter, wherein an adjustment apparatus is arranged on a control handle; a catheter body is hollow, and a cavity is arranged therein; a lead wire, a temperature sensing wire and a pull wire are arranged in the cavity; one end of the catheter body is flexible, and the flexible end is connected to an annular ring; the annular ring is provided with an electrode group with each electrode connected to the lead wire and temperature sensing wire; the lead wire and temperature sensing wire go through the catheter body and are electrically connected to the control handle. The device uses cold saline perfusion method to protect the vascular intima and possesses advantages of simple operation, short operation time and controllable precise ablation. The device can be used to treat pulmonary hypertension with pulmonary denervation.

Claims

1. A multi-pole synchronous pulmonary artery radiofrequency ablation catheter, comprising:

a control handle including an adjustment apparatus;

a catheter body being hollow and comprising a cavity arranged in the catheter body; and

an annular ring;

wherein a lead wire, a temperature sensing wire and a pull wire are arranged in the cavity;

wherein one end of the catheter body is flexible, and the flexible end is connected to the annular ring, and wherein the other end of the catheter body is connected to the control handle;

wherein one end of the pull wire is connected to the flexible end, and the other end of the pull wire is connected to the adjustment apparatus on the control handle, the adjustment apparatus adjusts the tension of the pull wire to change a curvature of the flexible end;

a shape memory wire arranged in the annular ring, and one end of the shape memory wire extends to the end of the annular ring and the other end of the shape memory wire passes through the root of the annular ring and is fixed on the flexible end of the catheter body;

wherein the annular ring is provided with an electrode group comprising a plurality of electrodes, and each electrode of the electrode group is connected to the lead wire and temperature sensing wire;

wherein the lead wire and the temperature sensing wire go through the catheter body and are electrically connected to the control handle.

2. The multi-pole synchronous pulmonary artery radiofrequency ablation catheter according to claim 1, wherein an infusion tube is arranged in the cavity of the catheter body and a through hole is arranged on the electrode, the infusion tube extending through the annular ring and connected to the electrode such that transfused fluid flows out from the through hole.

3. The multi-pole synchronous pulmonary artery radiofrequency ablation catheter according to claim 1, wherein the electrode on the annular ring is made of a material selected from the group consisted of platinum-iridium alloy, gold, stainless steel and nickel alloy, with a number in the range of 3-30 electrodes, an electrode diameter in the range of 1.3-2.0 mm, a length in the range of 1.2-4 mm and an edge space between adjacent electrodes in the range of 0.5-10 mm.

4. The multi-pole synchronous pulmonary artery radiofrequency ablation catheter according to claim 1, wherein, the flexible end of the catheter body is provided with a counterbore, an inner diameter of the counterbore fits around an outer diameter of root of the annular ring, the root of the annular ring is inserted and fixed in the counterbore.

5. The multi-pole synchronous pulmonary artery radiofrequency ablation catheter according to claim 1, wherein the flexible end includes a groove, a connector is disposed in the groove, wherein one end of the connector is connected to the pull wire and the other end of the connector is connected to the shape memory wire.

6. The multi-pole synchronous pulmonary artery radiofrequency ablation catheter according to claim 1, wherein the material of the shape memory wire is a shape memory alloy selected from the group consisted of nickel titanium alloy, stainless steel and titanium, with a diameter in the range of 0.25-0.5 mm, the diameter of the annular ring being in the range of 12-40 mm.

7. The multi-pole synchronous pulmonary artery radiofrequency ablation catheter according to claim 1, wherein the flexible end of the catheter body is made of medical polymer materials with a length in the range of 30-80 mm.

8. The multi-pole synchronous pulmonary artery radiofrequency ablation catheter according to claim 1, wherein the connector is connected with a UV-curing adhesive.

9. The multi-pole synchronous pulmonary artery radiofrequency ablation catheter according to claim 1, wherein the joint between the flexible end of the catheter body and the annular ring is sealed.

10. The multi-pole synchronous pulmonary artery radiofrequency ablation catheter according to claim 1, wherein the pull wire is made of stainless steel or nickel-titanium alloy, the pull wire including a coil spring, the coil spring includes a spring sleeve made of a polyimide material.

11. The multi-pole synchronous pulmonary artery radiofrequency ablation catheter according to claim 1, wherein the shape memory wire is configured to bias the annular ring into a circumferential configuration with exposed surfaces of the electrodes facing radially outwardly.

12. A multi-pole pulmonary artery radiofrequency ablation catheter, comprising:

a catheter body including a handle;

a lumen member having a proximal end connected to the catheter body and a distal end;

an electrode assembly having a proximal end connected to the distal end of the lumen member, the electrode assembly comprising a longitudinally extending flexible lumen member and a plurality of ablation electrodes disposed along the flexible lumen member, each electrode having a surface exposed at an outer surface of the flexible lumen member, the flexible lumen member being biased into a circumferentially extending configuration wherein exposed surfaces of the electrodes face a radially outward direction when the flexible lumen member is in the circumferentially extending configuration.

13. The catheter according to claim 12, additionally comprising an electrical connection having a proximal portion in the handle and extending from the handle to each of the plurality electrodes and configured to allow energy applied to the proximal portion of the electrical connection to be independently applied to each of the electrodes.

14. The catheter according to claim 13, wherein the electrodes are separated and electrically isolated from each other.

15. The catheter according to claim 14, wherein the electrical connection comprises a plurality of electrical wires connected to the electrode, respectively.

16. The catheter according to claim 12, wherein each electrode further comprises a plurality of through holes and wherein the flexible lumen member includes at least one lumen extending from the proximal end of the flexible lumen member to the through holes on each of the electrodes thereby forming a fluidic connection from the proximal portion of the flexible lumen member to the through holes.

17-48. -48. (canceled)