CN114557767A

CN114557767A - Ablation catheter

Info

Publication number: CN114557767A
Application number: CN202210125529.0A
Authority: CN
Inventors: 汪立; 梁鑫锋; 张晨朝; 沈炜; 江秋枫
Original assignee: SHANGHAI ANTONG MEDICAL TECHNOLOGY CO LTD
Current assignee: SHANGHAI ANTONG MEDICAL TECHNOLOGY CO LTD
Priority date: 2022-02-10
Filing date: 2022-02-10
Publication date: 2022-05-31

Abstract

The invention discloses an ablation catheter, which belongs to the technical field of medical instruments and comprises a connecting section; the ablation section consists of a conduit layer and an ablation electrode layer arranged on the outer side of the conduit layer; a control assembly to adjust a diameter of an ablation segment, the control assembly positioned in a lumen of the ablation catheter. The control assembly is arranged in the inner cavity of the ablation catheter, so that the diameter of the ablation section in the ablation catheter is controlled, and when the diameter of a blood vessel changes, the diameter can be changed in a self-adaptive manner, so that the ablation catheter is suitable for ablating blood vessels with different diameters.

Description

Ablation catheter

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to an ablation catheter.

Background

Ablation is a common medical means, catheter ablation refers to a treatment technology of delivering a catheter to the focus of atrial fibrillation (usually, the connection part of an atrium and a pulmonary vein) through a peripheral vein, and then releasing energy to denature and necrose partial cardiac muscle so as to block off abnormal electrical signals outside the heart from being transmitted to the atrium, and chinese patent document CN103505798A discloses an ablation catheter with a groove on the surface, which solves the problem that the contact area between the catheter and the vessel wall is large.

The cross section of the existing ablation catheter is shown in fig. 1, the adopted structure is that an inner layer outer layer catheter, a middle skeleton layer, a conducting wire layer and an electrode layer are of coaxial structures, the specification of the ablation catheter is fixed, the diameter is unchangeable and can only be used for blood vessels with specific diameters, and a single layer occupies the space of one layer respectively, so that the outer diameter of the catheter can be increased, the outer diameter is larger than the inner diameter of an opening of a radial artery, and the radial artery access cannot be realized.

Disclosure of Invention

The present invention is directed to an ablation catheter, which solves the above problems of the prior art during the use of the ablation catheter.

In order to achieve the purpose, the invention provides the following technical scheme: an ablation catheter comprising a connecting section;

the ablation section consists of a conduit layer and an ablation electrode layer arranged on the outer side of the conduit layer;

a control assembly to adjust a diameter of an ablation segment, the control assembly positioned in a lumen of the ablation catheter.

Preferably, the ablation section is provided with an opening at one end far away from the connecting section, and the opening is 5-10cm deep.

Preferably, the surface of the ablation catheter is processed by spiral cutting.

Preferably, the material of the ablation catheter is soft material.

Preferably, the control assembly comprises a control wire and a plurality of support component groups arranged along the length direction of the control wire.

Preferably, the single support component group comprises a plurality of support components distributed circumferentially around the control wire, one end of each support component is fixedly connected with the control wire, and the other end of each support component is fixedly connected to the inner surface of the catheter layer.

Preferably, the support member is connected to the control wire and the catheter layer by welding or bonding.

Preferably, the ablation electrode layer is disposed on the catheter by way of embedding.

Preferably, the ablation electrode layer is fixed by welding or bonding.

Preferably, the material of the catheter layer is pebax nylon, and the material of the support part and the control wire is medical grade alloy.

Compared with the prior art, the invention has the beneficial effects that:

1. the control assembly is arranged in the inner cavity of the ablation catheter, so that the diameter of the ablation section in the ablation catheter is controlled, and when the diameter of a blood vessel changes, the diameter can be changed in a self-adaptive mode, and the ablation catheter is suitable for ablating blood vessels with different diameters.

2. The ablation electrode layer is fixed on the catheter layer in an embedded mode, the outer diameter of the ablation catheter is greatly reduced, and the radial artery access can be achieved.

Drawings

FIG. 1 is a schematic view of a prior art catheter according to the present invention;

FIG. 2 is a schematic cross-sectional view of an ablation segment of the present invention;

FIG. 3 is a first structural diagram illustrating an operating state of the present invention;

FIG. 4 is a second structural diagram illustrating the operation state of the present invention;

fig. 5 is a third schematic structural diagram of the working state of the present invention.

In the figure: 1. an ablation catheter; 1a, a connecting section; 1b, an ablation section; 100. a conduit layer; 101. ablating the electrode layer; 2. an inner cavity; 3. a control component; 300. controlling the filament; 301. a support member; 4a, a conduit inner layer; 4b, a framework layer; 4c, a conductor layer; 4d, the outer layer of the catheter; 4e, an electrode layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a technical scheme that: the utility model provides an ablation catheter (hereinafter referred to as ablation catheter 1), it is whole hollow circular cylinder, constitute by the pipe body and the control assembly 3 that is arranged in pipe body inner chamber 2, refer to fig. 2, the cross section of pipe body is the ring shape, divide into linkage segment 1a and ablation section 1b, wherein linkage segment 1a is single-layer conduit structure, it is bilayer structure to melt electrode layer 101, including interconnect's pipe layer 100 and ablation electrode layer, and melt the outside that the electrode layer is arranged in pipe layer 100, control assembly 3 is arranged in pipe layer 100 inboard and only sets up at ablation section 1b interval, a diameter for changing ablation section 1b on melting pipe 1b melts the diameter of pipe, with this satisfy carry in the vascular wall of different diameters and laminate with different diameter vascular wall, accomplish the effect of melting.

Further, in order to facilitate the change of the diameter of the ablation catheter 1, the ablation catheter 1 may be processed as follows:

the first embodiment is as follows:

in order to realize the change of the diameter of the ablation catheter 1, the ablation section 1b is provided with an opening at the end far away from the connecting section 1a, and the opening depth is 5-10 cm.

Furthermore, the surface of the catheter is processed by a spiral cutting processing opening, so that the diameter change of the ablation catheter 1 can be more convenient.

Example two:

in order to realize the change of the diameter of the ablation catheter 1, the material in the ablation catheter 1 is selected from a soft material, and pebax nylon is preferably used as the material of the ablation catheter 1.

Example three:

in a second embodiment of the first embodiment, the ablation catheter 1 may be made of a soft material and an opening is formed at one end of the ablation section 1 b.

Further, the control assembly 3 is composed of a control wire 300 and a plurality of support part sets arranged along the length direction of the control wire 300, each support part set is composed of a plurality of support parts 301 distributed circumferentially around the control wire 300, one end of each support part 301 is fixedly connected with the control wire 300, and the other end of each support part 301 is fixedly connected to the inner surface of the catheter layer 100.

Further, the central axis of the control wire 300 coincides with the central axis of the ablation catheter 1, and the specification of the single supporting component 301 is the same, so that the control wire 300 and the supporting component 301 are arranged, the diameter of the ablation catheter 1 can be expanded more uniformly, the control wire can be better attached to the wall of a blood vessel, and the supporting component 301 and the control wire 300 can be made of medical grade alloy.

Further, the support member 301 may be connected to the control wire 300 and the catheter layer 100 by welding or bonding.

Furthermore, an ablation electrode layer in the ablation section 1b is arranged on the catheter in an embedded mode and is fixed by welding or bonding, so that the outer diameter of the ablation catheter 1 can be reduced, after embedding, the outer diameter of the ablation section 1b is the same as that of the connecting section 1a, the diameter of the ablation catheter 1 in a conveying state is about 2.3mm-3mm, and radial artery access can be achieved.

The operation principle of the ablation catheter 1 is as follows (in the following description of the principle, the wire for supplying power to the ablation electrode is located in the inner lumen 2 of the ablation catheter 1):

referring to fig. 3, 4 and 5, the ablation catheter 1 is shown in different operating states;

fig. 3 is a schematic structural view of the ablation catheter 1 in a delivery state, in which the supporting member 301 is in an inclined state, and the ablation section 1b is in a small diameter state under the action of mechanical traction of the supporting member 301, in which the diameter is about 2.3mm-3mm, and in this state, the catheter can complete delivery operation to deliver the catheter to a part to be ablated;

fig. 4 is that ablation catheter 1 is in the structural schematic diagram one that melts the state, and control silk 300 carries out linear motion along ablation catheter 1's axis under the effect of external force at this time, and then drives supporting component 301 and move, melts section 1b and outwards expands under supporting component 301's effect, and the surface and the vascular wall of ablating the electrode layer laminate, can begin to melt.

Fig. 5 is a structural schematic diagram of the ablation catheter 1 in an ablation state, which is also a structural schematic diagram of the ablation catheter 1, in which the control wire 300 drives the supporting component 301 to move, an included angle between the supporting component 301 and the control wire 300 is 90 degrees, an outer diameter of the ablation catheter 1 reaches a maximum value, which is about 10mm, and ablation can be performed on a large-diameter blood vessel.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An ablation catheter, characterized by: comprises that

A connecting section (1 a);

the ablation section (1b) is composed of a conduit layer (100) and an ablation electrode layer (101) arranged on the outer side of the conduit layer (100);

a control component (3) for adjusting the diameter of the ablation section (1b), wherein the control component (3) is positioned in the inner cavity (2) of the ablation catheter (1).

2. An ablation catheter as in claim 1, wherein: the ablation section (1b) is subjected to opening treatment at one end far away from the connecting section (1a), and the opening depth is 5-10 cm.

3. An ablation catheter as in claim 2, wherein: the surface of the ablation catheter (1) is processed by a spiral cutting processing opening.

4. An ablation catheter according to claim 1 or 2, wherein: the ablation catheter (1) is made of a soft material.

5. An ablation catheter as in claim 1, wherein: the control assembly (3) comprises a control wire (300) and a plurality of supporting component groups arranged along the length direction of the control wire (300).

6. An ablation catheter as in claim 5, wherein: the single support component group comprises a plurality of support components (301) distributed circumferentially around the control wire (300), one end of each support component (301) is fixedly connected with the control wire (300), and the other end of each support component (301) is fixedly connected to the inner surface of the catheter layer (100).

7. An ablation catheter as in claim 6, wherein: the supporting part (301) is connected with the control wires (300) and the conduit layer (100) by welding or bonding.

8. An ablation catheter as in claim 1, wherein: the ablation electrode layer (101) is arranged on the catheter by means of embedding.

9. An ablation catheter as in claim 8, wherein: the ablation electrode layer (101) is fixed in a welding or bonding mode.

10. An ablation catheter as in claim 1, wherein: the material of the catheter layer (100) is pebax nylon, and the material of the support part (301) and the control wire (300) is medical grade alloy.