CN-121987322-A - Catheter electrode assembly of balloon catheter and balloon catheter

CN121987322ACN 121987322 ACN121987322 ACN 121987322ACN-121987322-A

Abstract

The invention relates to the field of electrophysiology catheters, in particular to a catheter electrode assembly of a balloon catheter and the balloon catheter. The catheter electrode assembly of the balloon catheter comprises a balloon body and electrode plates, wherein the electrode plates are arranged on the balloon body and used for transmitting electric energy, at least two groups of electrode plates are arranged along the circumferential direction of the balloon body, each group of electrode plates comprises a proximal electrode plate arranged on the proximal side of the balloon body and a distal electrode plate arranged on the distal side of the balloon body, the proximal electrode plates and the distal electrode plates are arranged along the proximal and distal directions of the balloon body, the proximal electrode plates form a proximal gradual change region, the size of the proximal gradual change region along the circumferential direction of the balloon body gradually narrows from the middle of the proximal and distal directions of the balloon body to the proximal end of the balloon body, the distal electrode plates form a distal gradual change region, and the size of the distal gradual change region along the circumferential direction of the balloon body gradually narrows from the middle of the proximal and distal directions of the balloon body to the distal ends of the balloon body. The invention mainly solves the technical problem how to enable the balloon catheter to better act with target tissues in different directions.

Inventors

CHEN HAO
HUANG LONG
Mo Zhidai
SONG QING
FENG JUN

Assignees

心航路医学科技(广州)有限公司

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (10)

1. A catheter electrode assembly of a balloon catheter, comprising: a balloon, said balloon being inflatable and deflatable, said balloon having a proximal end and a distal end; The electrode sheet is arranged on the bag body and used for transmitting electric energy; The electrode plates are circumferentially provided with at least two groups along the capsule body, each group of electrode plates comprises a proximal electrode plate arranged on the proximal side of the capsule body and a distal electrode plate arranged on the distal side of the capsule body, and the proximal electrode plate and the distal electrode plate are arranged along the proximal and distal directions of the capsule body; The proximal pole piece forms a proximal gradual change region, the size of the proximal gradual change region along the circumferential direction of the capsule body gradually narrows from the middle part of the proximal direction of the capsule body to the proximal direction of the capsule body, and the distal pole piece forms a distal gradual change region, the size of the distal gradual change region along the circumferential direction of the capsule body gradually narrows from the middle part of the proximal direction of the capsule body to the distal direction of the capsule body.
2. The catheter electrode assembly of claim 1, wherein the proximal ends of the proximal pole pieces are each arcuate, the proximal graded region is located between the arcuate shapes at both ends, and/or the proximal ends of the distal pole pieces are each arcuate shapes, the distal graded region is located between the arcuate shapes at both ends.
3. The catheter-electrode assembly of claim 1, wherein the catheter-electrode assembly comprises a flexible circuit board comprising an insulating substrate and the electrode sheet, the insulating substrate being attached to the balloon and the electrode sheet being secured to the insulating substrate; the flexible circuit board comprises a proximal end part and a distal end part, wherein the proximal end part and the distal end part are respectively arranged on the proximal end side and the distal end side of the capsule body, the shape of an insulating matrix of the proximal end part is a gradual change shape matched with the proximal pole piece, and the shape of the insulating matrix of the distal end part is a gradual change shape matched with the distal pole piece.
4. The catheter-electrode assembly of claim 3, wherein the flexible circuit board forms at least two circuit strips circumferentially distributed along the balloon, the circuit strips including a connecting portion connected between the proximal portion and the distal portion.
5. The catheter-electrode assembly of claim 4, wherein the connecting portion has a smaller dimension along the balloon circumference than the proximal and distal portions.
6. The catheter-electrode assembly of claim 4, wherein the number of circuit strips is 2 to 8.
7. The catheter-electrode assembly of any one of claims 3 to 6, wherein the flexible circuit board has an edge portion at a periphery of the electrode sheet, at least a portion of the edge portion having through-holes distributed thereon for improving compliance of the edge portion.
8. The catheter electrode assembly of any one of claims 1-6, wherein the proximal pole piece and the distal pole piece are symmetrically arranged in a proximal-distal direction.
9. The catheter-electrode assembly of any one of claims 1 to 6, wherein the distal end of the balloon is provided with a concave portion, or is of a smooth configuration.
10. A balloon catheter, comprising: An operation handle; An insertion tube connected to a distal end of the operation handle; A catheter electrode assembly according to any one of claims 1 to 9, which is attached to the distal end of the insertion tube.

Description

Catheter electrode assembly of balloon catheter and balloon catheter Technical Field The invention relates to the field of electrophysiology catheters, in particular to a catheter electrode assembly of a balloon catheter and the balloon catheter. Background Atrial fibrillation, abbreviated as atrial fibrillation, is the most common clinical arrhythmia, and its incidence increases gradually with age. Currently, catheter ablation has become an important treatment modality for atrial fibrillation. The pulse electric field ablation is a new tissue ablation means based on physical energy factors, which mainly uses the irreversible electroporation principle, and the cell membrane is perforated irreversibly by the action of the high-voltage pulse electric field on the cell, so that the cell gradually necroses, and finally the tissue ablation purpose is realized. The pulse ablation devices on the market at present are mostly in the shape of a petal or basket catheter, and are converted into different state configurations by controlling the push-pull of the tube core. The ablation electrode is usually born by a plurality of slender flexible branches to a flap-shaped or basket-shaped catheter, in the actual use process, as the heart continuously contracts and expands and blood flows rapidly, the stability of the shape of the catheter in the body and the direction angle between the electrodes on the flexible branches are not easy to ensure, the discharge position is difficult to control for the complex shape of the tissue with a special anatomical structure, even the situation that the ablation electrode of the catheter is extruded, the electrode overlap is abnormal and the like and the ablation energy cannot be effectively transmitted can occur, and more bubbles in the blood can be generated due to the heat generated by the abnormal electrode, so that the stroke risk of a patient is brought. Another balloon catheter generally includes an insertion tube and a catheter electrode assembly disposed at a distal end of the insertion tube, and the balloon catheter may be inflated with a liquid or gas to inflate a balloon body at its distal end, thereby expanding a flexible circuit board distributed on the balloon body into a desired shape so that electrodes on the flexible circuit board contact target tissues of the human body. Balloon catheters facilitate control of the position of the ablation electrode, but they need to consider how to interact with target tissue at different orientations. Disclosure of Invention The invention mainly solves the technical problem of how to enable the balloon catheter to better act with target tissues in different orientations. In a first aspect, in one embodiment there is provided a catheter electrode assembly for a balloon catheter. A catheter electrode assembly of a balloon catheter, comprising: a balloon, said balloon being inflatable and deflatable, said balloon having a proximal end and a distal end; The electrode sheet is arranged on the bag body and used for transmitting electric energy; The electrode plates are circumferentially provided with at least two groups along the capsule body, each group of electrode plates comprises a proximal electrode plate arranged on the proximal side of the capsule body and a distal electrode plate arranged on the distal side of the capsule body, and the proximal electrode plate and the distal electrode plate are arranged along the proximal and distal directions of the capsule body; The proximal pole piece forms a proximal gradual change region, the size of the proximal gradual change region along the circumferential direction of the capsule body gradually narrows from the middle part of the proximal direction of the capsule body to the proximal direction of the capsule body, and the distal pole piece forms a distal gradual change region, the size of the distal gradual change region along the circumferential direction of the capsule body gradually narrows from the middle part of the proximal direction of the capsule body to the distal direction of the capsule body. In one embodiment, the proximal and distal ends of the proximal pole piece are each arc-shaped, the proximal gradual change region is located between the arcs at the two ends, and/or the proximal and distal ends of the distal pole piece are each arc-shaped, and the distal gradual change region is located between the arcs at the two ends. In one embodiment, the catheter-electrode assembly comprises a flexible circuit board comprising an insulating substrate and the electrode sheet, the insulating substrate being attached to the balloon and the electrode sheet being fixed to the insulating substrate; the flexible circuit board comprises a proximal end part and a distal end part, wherein the proximal end part and the distal end part are respectively arranged on the proximal end side and the distal end side of the capsule body, the shape of an insulating matrix of the proximal end part is a g