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CN-121987319-A - Balloon catheter and insertion tube structure of balloon catheter

CN121987319ACN 121987319 ACN121987319 ACN 121987319ACN-121987319-A

Abstract

The invention relates to the field of balloon catheters, in particular to a balloon catheter and an insertion tube structure of the balloon catheter. The balloon catheter insertion tube structure comprises a tube body, an insulating tube, a wire and a sealing seat, wherein a hollow tube cavity is formed by the tube wall of the tube body, the insulating tube is arranged in the hollow tube cavity, a first channel is formed in the tube cavity of the insulating tube, a second channel is formed between the tube wall of the insulating tube and the inner wall of the tube body, the first channel and the second channel are mutually isolated, the wire is arranged in the insulating tube and comprises a conductive wire core and an insulating layer wrapping the outer part of the conductive wire core, the distal end of the first channel is sealed with the wire, the sealing seat is sealed at the proximal end of the hollow tube cavity, a fluid communication port and an outlet are arranged on the sealing seat, the fluid communication port is used for communicating the second channel with the outer part of the sealing seat, the outlet is in sealing connection with the insulating tube, and the wire is led out by the outlet. The invention mainly solves the technical problem that the cross-sectional area of the pressure cavity of the balloon catheter is limited.

Inventors

  • Mo Zhidai
  • HUANG LONG
  • 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. 1. An insertion tube structure of a balloon catheter, comprising: The pipe body is provided with a hollow pipe cavity; The insulating tube is arranged in the hollow tube cavity, a first channel is formed in the tube cavity of the insulating tube, a second channel is formed between the tube wall of the insulating tube and the inner wall of the tube body, and the first channel and the second channel are mutually isolated; The wire is arranged in the insulating tube, the wire comprises a conductive wire core and an insulating layer wrapped outside the conductive wire core, and the distal end of the first channel is sealed with the wire; The sealing seat is plugged at the proximal end of the hollow tube cavity, a fluid communication port and an outlet are arranged on the sealing seat, the fluid communication port is used for communicating the second channel with the outside of the sealing seat, the outlet is in sealing connection with the insulating tube, and the outlet is used for leading out the lead.
  2. 2. The insertion tube structure as claimed in claim 1, wherein the insulation tube is an equal diameter tube, or the insulation tube is a heat shrink tube, and the wire is wrapped with the heat shrink insulation tube.
  3. 3. The insertion tube structure according to claim 2, wherein the number of the insulating tubes is 2 or more, at least one of the insulating tubes is an equal-diameter tube, and/or at least one of the insulating tubes is the heat shrink tube.
  4. 4. An insertion tube structure as claimed in claim 1, 2 or 3, wherein a fluid chamber is provided in the seal housing, the fluid communication port being in communication with the fluid chamber, the proximal end of the tube body being connected to the fluid chamber, the hollow tube chamber being in communication with the fluid chamber.
  5. 5. The insertion tube structure as defined in claim 4, wherein the tube body includes a bending section at a distal end, and a pull rope cavity is provided on a wall of the tube body; the insertion tube structure further comprises a pull rope tube and a pull rope for realizing bending adjustment of the bending adjustment section, wherein the pull rope tube is arranged in the pull rope cavity in a penetrating manner, and the pull rope is arranged in the pull rope tube in a penetrating manner; The pull rope tube passes through the sealing seat, the inner cavity of the pull rope tube is isolated from the fluid cavity, or the proximal end of the pull rope tube is connected to the fluid cavity in a sealing way, the pull rope passes through the fluid cavity, the sealing seat is provided with a pull rope perforation for leading out the pull rope, the pull rope passes through the pull rope perforation, and a dynamic sealing structure is arranged between the pull rope perforation and the pull rope.
  6. 6. The insertion tube structure of claim 4, wherein the sealing seat includes a seat body and a cover body fixed to a distal end side of the seat body, the fluid chamber being defined by the seat body and the cover body.
  7. 7. An insertion tube structure as claimed in claim 1,2 or 3, wherein the sealing seat is provided with a plug hole, and the proximal end of the tube body is inserted into the plug hole and forms a seal with the sealing seat.
  8. 8. The insertion tube structure of claim 1, 2 or 3, further comprising a central rod disposed within the hollow lumen, a distal end of the central rod extending beyond the tube body, a proximal end of the central rod passing over and sealing with the sealing seat.
  9. 9. The insertion tube structure as defined in claim 1, 2 or 3, further comprising a lining tube located inside the distal end of the hollow lumen, the lining tube being sleeved outside the center rod, the center rod being movable in a proximal-distal direction in the lining tube, the insulating tube passing between the lining tube and the wall of the hollow lumen, a sealing material being provided between the wall of the hollow lumen and the outer peripheral surface of the lining tube, the outer peripheral surface of the insulating tube forming a seal with the sealing material.
  10. 10. A balloon catheter, comprising: An operation handle; The balloon electrode assembly comprises a balloon body and an electrode arranged on the surface of the balloon body; And an insertion tube connected between the operation handle and the balloon electrode assembly, the insertion tube having the insertion tube structure as set forth in any one of claims 1 to 9, the seal seat being provided on the operation handle.

Description

Balloon catheter and insertion tube structure of balloon catheter Technical Field The invention relates to the field of balloon catheters, in particular to a balloon catheter and an insertion tube structure of the balloon catheter. Background Pulsed electric field ablation catheters vary in morphology, such as linear catheters, basket catheters, petal catheters, balloon catheters, and the like. Pulsed electric field ablation catheters are typically passed through a sheath path of 8-13Fr (Fr is a unit used to describe diameters in the field of catheter-like medical devices, 3 fr=1 mm,8-13Fr is also 2.67-4.33 mm) to the target tissue, which places major constraints on the internal structure and function of the pulsed electric field ablation catheter. The electrodes of the pulsed electric field ablation catheter are connected with leads, which typically pass through the insertion tube and can ultimately be led out through connectors on the operating handle. The basic principle of the pulsed electric field ablation technology is that cells are necrotized or apoptotic by electric field energy, which usually reaches hundreds of volts or even thousands of volts, and corresponding wires in the pulsed electric field ablation catheter are provided with high-voltage pulses during operation, which poses a challenge for the insulation of various components in the pulsed electric field ablation catheter. In order to meet the insulation requirement of the wire, an insulation layer is often disposed outside the conductive core of the wire as basic insulation, and an additional insulation layer may be required as reinforcing insulation. However, in the case of balloon catheters, a pressure lumen through which filling fluid (air or liquid) passes is generally provided in the balloon catheter, and by controlling the pressure change of the filling fluid, filling and deflation of the balloon are achieved, so that the balloon body generates a corresponding morphological change. The addition of an insulating layer occupies the space inside the insertion tube, which results in a restriction of the cross-sectional area of the pressure chamber, and the time required to deflate and inflate the balloon on the premise of a certain flow rate is mainly dependent on the cross-sectional area of the pressure chamber and the applied pressure according to the correlation equation of the fluid mechanics. Currently, balloon catheters present a technical bottleneck in applying pulsed electric fields, i.e. more electrodes are required for more efficient ablation, more electrodes are required for more insulation, but also result in smaller cross-sectional areas of the pressure lumen. The smaller the cross-sectional area of the pressure lumen, the more pressure and time is required to deflate the balloon and inflate the balloon, resulting in a poor user experience. Disclosure of Invention The invention mainly solves the technical problem that the cross-sectional area of the pressure cavity of the balloon catheter is limited. In a first aspect, an embodiment provides an insertion tube structure for a balloon catheter. An insertion tube structure of a balloon catheter, comprising: The pipe body is provided with a hollow pipe cavity; The insulating tube is arranged in the hollow tube cavity, a first channel is formed in the tube cavity of the insulating tube, a second channel is formed between the tube wall of the insulating tube and the inner wall of the tube body, and the first channel and the second channel are mutually isolated; The wire is arranged in the insulating tube, the wire comprises a conductive wire core and an insulating layer wrapped outside the conductive wire core, and the distal end of the first channel is sealed with the wire; The sealing seat is plugged at the proximal end of the hollow tube cavity, a fluid communication port and an outlet are arranged on the sealing seat, the fluid communication port is used for communicating the second channel with the outside of the sealing seat, the outlet is in sealing connection with the insulating tube, and the outlet is used for leading out the lead. In one embodiment, the insulating tube is an equal-diameter tube, or the insulating tube is a heat-shrinkable tube, and the wire is wrapped by the heat-shrinkable insulating tube. In one embodiment, the number of the insulating tubes is greater than or equal to 2, at least one insulating tube is a constant diameter tube, and/or at least one insulating tube is the heat shrink tube. In one embodiment, a fluid cavity is arranged in the sealing seat, the fluid communication port is communicated with the fluid cavity, the proximal end of the tube body is connected to the fluid cavity, and the hollow tube cavity is communicated with the fluid cavity. In one embodiment, the pipe body comprises a bending section positioned at a far end, wherein a pull rope cavity is arranged on the pipe wall of the pipe body, the insertion pipe structure further compr