Balloon-type electrode catheter

Patent metadata

Field	Value
Publication number	US-12076077-B2
Application number	US-202017120226-A
Country	US
Kind code	B2
Filing date	Dec 13, 2020
Priority date	Aug 15, 2018
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

A balloon-type electrode catheter is capable of performing an ablation treatment with respect to a lesion over a wide area and excellent in an effect of cooling the inner portion of a balloon. The balloon-type electrode catheter includes an outer tube, an energization connector, a balloon having neck portions at both ends of an expansion portion, an inner tube, a distal end tip, strip electrodes formed on the outer surface of the balloon, and a conducting wire that connects each of the strip electrodes and the energization connector to each other. Openings of fluid supply sub lumens of the outer tube are located on the distal end side from an intermediate location in the axial direction in the expansion portion of the balloon. Openings of fluid drainage sub lumens of the outer tube are located at the proximal end of the expansion portion.

First claim

The invention claimed is:

1. A balloon-type electrode catheter for performing a high frequency ablation treatment, the balloon-type electrode catheter comprising :
an outer tube that has a center lumen and a plurality of sub lumens that are disposed around the center lumen;
an energization connector that is disposed on a proximal end side of the outer tube;
a balloon that has an expansion portion that expands and contracts and a proximal-end-side neck portion and a distal-end-side neck portion, wherein the proximal-end-side neck portion is continuous with an end of the expansion portion and the distal-end-side neck portion is continuous with another end of the expansion portion, the balloon being connected to a distal end side of the outer tube as a result of the proximal-end-side neck portion being fixed to a distal end portion of the outer tube and the expansion portion containing the distal end portion of the outer tube;
an inner shaft that is inserted into the center lumen of the outer tube, the inner shaft extending out through an opening of the center lumen into an inner portion of the balloon, being fixed to the distal-end-side neck portion of the balloon, and extending out to an outside of the balloon;
a surface electrode that is formed by a metal thin film that is formed on an outer surface of the balloon at at least the expansion portion of the balloon; and
a conducting wire that electrically connects the surface electrode and the energization connector to each other,
wherein at least one of the sub lumens of the outer tube is a fluid supply sub lumen in which a fluid, including physiological saline solution, is caused to flow to supply the fluid into the inner portion of the balloon,
wherein at least one of the sub lumens of the outer tube is a fluid drainage sub lumen in which the fluid is caused to flow to drain the fluid supplied into the inner portion of the balloon, from the inner portion of the balloon,
wherein an opening of either one of the fluid supply sub lumen and the fluid drainage sub lumen is located on a distal end side further from an intermediate location in an axial direction in the expansion portion,
wherein an opening of the other of the fluid supply sub lumen and the fluid drainage sub lumen is located at a proximal end of the expansion portion or in a vicinity thereof,
wherein the opening of the fluid supply sub lumen is located on the distal end side from the intermediate location in the axial direction in the expansion portion,
wherein the opening of the fluid drainage sub lumen is located at the proximal end of the expansion portion or in a vicinity thereof,

wherein the outer tube is formed by
a circular tubular part that extends in a proximal end direction from the proximal end of the expansion portion or a location in a vicinity thereof, and
a semicircular tubular part that extends in a distal end direction from the proximal end of the expansion portion or a location in the vicinity thereof in an inner portion of the expansion portion beyond the intermediate location in the axial direction in the expansion portion,
wherein the fluid supply sub lumen is disposed in inner portions of the circular tubular part and the semicircular tubular part and opens in a distal end surface of the semicircular tubular part, and
wherein the fluid drainage sub lumen is disposed in the inner portion of the circular tubular part and opens in a distal end surface of the circular tubular part.

2. The balloon-type electrode catheter according to claim 1 ,
wherein an opening area of the fluid supply sub lumen is larger than an opening area of the fluid drainage sub lumen.

3. The balloon-type electrode catheter according to claim 1 ,
wherein a number of the fluid supply sub lumen is greater than a number of the fluid drainage sub lumen.

4. The balloon-type electrode catheter according to claim 1 ,
wherein the inner shaft is formed by
an inner tube that has a lumen into which a guide wire is insertable and that is inserted into the center lumen of the outer tube and extends out through the opening of the center lumen into the inner portion of the balloon, and
a distal end tip that has a lumen in communication with the lumen of the inner tube and that is, while being connected to a distal end of the inner tube in the inner portion of the balloon, fixed to the distal-end-side neck portion and extends out to the outside of the balloon.

5. The balloon-type electrode catheter according to claim 4 ,
wherein a distal end portion of the surface electrode extends on an outer surface of the distal-end-side neck portion,
wherein a metal ring is provided, the metal ring being electrically connected to the surface electrode by being mounted on the distal-end-side neck portion of the balloon such that an inner circumferential surface of the metal ring is in contact with the distal end portion of the surface electrode, and
wherein a distal end of the conducting wire is connected to the inner circumferential surface of the metal ring, the conducting wire extends in the inner portion of the balloon and in the sub lumens of the outer tube, the sub lumens being different from either of the fluid supply sub lumen and the fluid drainage sub lumen, and a proximal end of the conducting wire is connected to the energization connector.

6. The balloon-type electrode catheter according to claim 5 ,
wherein the surface electrode is a plurality of strip electrodes that are formed so as to extend in an axial direction of the balloon and that are disposed in a circumferential direction of the balloon at equal angular the inner intervals, and circumferential surface of the metal ring is in contact with a distal end portion of each of the strip electrodes.

7. The balloon-type electrode catheter according to claim 5 ,
wherein the metal ring is insulation coated.

8. The balloon-type electrode catheter according to claim 1 ,
wherein the inner shaft is formed by a hollow or solid needle.

9. The balloon-type electrode catheter according to claim 1 ,
wherein an outer diameter of the distal end portion of the outer tube to which the proximal-end-side neck portion of the balloon is fixed is formed to be smaller than an outer diameter of a proximal end portion of the outer tube, and
wherein an outer diameter of the proximal-end-side neck portion of the balloon and the outer diameter of the proximal end portion of the outer tube are substantially equal to each other.

10. The electrode catheter according to claim 1 ,
wherein a temperature sensor is disposed at a tube wall of the balloon.

Assignees

• Japan Lifeline Co Ltd

Inventors

• Mori Kenji

Classifications

• A61B2562/0271

  Thermal or temperature sensors · CPC title

• A61B2018/1467

  using more than two electrodes on a single probe · CPC title

• A61B2018/00744

  Fluid flow · CPC title

• A61B2018/00577

  Ablation · CPC title

• A61B2018/0022

  Balloons · CPC title