Cold saline perfusion radiofrequency ablation catheter

Abstract

The cold saline perfusion radiofrequency ablation catheter comprises an electrode tip and a catheter part connected with the electrode tip, the electrode tip is provided with an ablation electrode, the catheter part is provided with a liquid injection channel, a first wire channel and a first pull wire channel, the first wire channel is internally provided with a first wire communicated with the ablation electrode, and the first pull wire channel is internally provided with a second wire communicated with the ablation electrode. A first stay wire capable of bending the electrode tip is mounted in the first stay wire channel; a plurality of first liquid outlet channels and a plurality of second liquid outlet channels are arranged in the pipe part, and the first liquid outlet channels and the second liquid outlet channels are communicated with the liquid injection channel. The cold saline water has two spraying modes, and spraying is more uniform.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a cold saline-irrigated high-frequency ablation catheter. Background Art

[0002] Arrhythmia refers to abnormal changes in the normal rhythm of the heart, and clinically, palpitations, panic, dizziness, and vertigo are the main manifestations. With the development of technology, catheter radiofrequency ablation is one of the methods for treating arrhythmia in clinical treatment. The radiofrequency ablation catheter can follow the blood vessels of the human body so that the ablation electrode reaches the location of the lesion, releases high-frequency current locally, and generates very high temperatures in a very small range. Through thermal efficiency, local tissue necrosis is achieved to achieve the purpose of treatment. However, there are also some problems with such radiofrequency ablation treatment. For example, when the top temperature of the ordinary radiofrequency ablation catheter reaches a certain level, the denatured protein will form a coagulant on the electrode, limiting the scope and depth of the injury. During the ablation process, the cold saline perfusion ablation electrode catheter can prevent and reduce the formation of coagulants on the electrode due to the continuous perfusion of cold saline, effectively conduct energy, increase output power, and expand the scope and depth of the injury. However, when the cold saline of the existing cold saline perfusion ablation electrode catheter is sprayed, the spraying effect is sometimes not uniform enough, and the spraying method is relatively single, which is difficult to meet the complex needs of clinical treatment. Summary of the invention

[0003] Purpose of the invention: This application aims to overcome the defects of the prior art and provide a cold saline irrigated high-frequency ablation catheter.

[0004] Technical solution: A cold saline-irrigated high-frequency ablation catheter comprises an electrode head and a tube portion connected to the electrode head, the electrode head being provided with an ablation electrode, the tube portion being provided with an injection channel, a first wire channel and a first pull-wire channel, the first wire channel being provided with a first wire connected to the ablation electrode, the first pull-wire channel being provided with a first pull-wire capable of bending the electrode head; the tube portion being provided with a plurality of first liquid outlet channels and a plurality of second liquid outlet channels, the first liquid outlet channels and the second liquid outlet channels being both connected with the injection channel.

[0005] Furthermore, the plurality of first liquid outlet channels are equally spaced in a ring shape, and the plurality of second liquid outlet channels are equally spaced in a ring shape.

[0006] Furthermore, the injection channel includes a first channel portion and a second channel portion connected to the first channel portion, one end of the first channel portion is closed, and the other end is connected to the second channel portion, and the first liquid outlet channel and the second liquid outlet channel are both connected to the first channel portion; a plugging portion is installed in the first channel portion, and the plugging portion includes an end plate, a circumferential plate connected to the end plate, and a bracket portion connected to the circumferential plate, and the bracket portion is connected to a second pull wire, a first spring is connected between an end of the first channel portion close to the electrode head and the end plate, and a second spring is connected between an end of the circumferential plate and an end of the first channel portion away from the electrode head; a pressure sensor is installed at an end of the first channel portion close to the electrode head, and the end plate has a groove portion, and a pressing block capable of pressing the pressure sensor is fixed to the groove portion; the tube portion has a It has an annular groove, on which a circular cylindrical surrounding plate connected to the tube part is fixed, the second liquid outlet channel is connected to the annular groove, and the surrounding plate has a plurality of liquid outlet holes; the circumferential plate has a plurality of first communicating holes distributed in a circular shape with equal spacing, and a plurality of second communicating holes distributed in a circular shape with equal spacing, the number of the first communicating holes is equal to the number of the first liquid outlet channels and the two correspond one to one, the number of the second communicating holes is equal to the number of the second liquid outlet channels and the two correspond one to one; the blocking part can be in a first state and a second state, in the first state, each first communicating hole is connected to the corresponding first liquid outlet channel, and all the second liquid outlet channels are closed by the circumferential plate; in the second state, all the first liquid outlet channels are closed by the circumferential plate, and each second communicating hole is connected to the corresponding second liquid outlet channel.

[0007] Furthermore, when there is no external force, the blocking portion is in the first state.

[0008] Therefore, under normal conditions, the first liquid outlet channel is used to spray out cold salt water.

[0009] Further, the diameter of the first channel portion is greater than the diameter of the second channel portion.

[0010] Therefore, the blocking portion can only be located in the first channel portion, and the step portion formed between the first channel portion and the second channel portion makes installation of the second spring more convenient.

[0011] Furthermore, the support portion includes four radial rods distributed in an annular shape with equal intervals.

[0012] Furthermore, the number of the first liquid outlet channel, the second liquid outlet channel, the first connecting hole and the second connecting hole are all 8.

[0013] Furthermore, the electrode head is provided with a temperature sensor, the tube portion is provided with a second wire channel, and the second wire channel is provided with a second wire connected to the temperature sensor.

[0014] Thus the temperature sensor can be used to measure temperature.

[0015] Furthermore, the first liquid outlet channel comprises a straight channel and a curved channel connected to the straight channel, and the angle between the axis of the straight channel and the axis of the first channel portion is less than 30 degrees.

[0016] Therefore, the first liquid outlet channel can spray liquid roughly along the direction of the electrode head.

[0017] Furthermore, the tube portion also has a second wire pulling channel, the second wire pulling channel is connected to the second channel portion, the second wire pulling channel has a flexible partition, the second wire pulling wire passes through the second wire pulling channel, and the second wire pulling wire passes through the flexible partition and is sealed and connected to the flexible partition.

[0018] Therefore, when the second pull wire is pulled, the flexible partition can isolate the cold salt water while not affecting the pulling of the second pull wire.

[0019] Furthermore, the liquid outlet holes have multiple circles, and the liquid outlet holes in each circle are distributed in a circular shape with equal intervals.

[0020] Beneficial effects: The cold saline irrigated injection frequency ablation catheter of the present application has a first liquid outlet channel and a second liquid outlet channel, thereby being able to achieve two modes of cold saline spraying.

[0021] When the second liquid outlet channel of the present application is used for spraying cold salt water, the cold salt water is sprayed out through the annular groove and the plurality of liquid outlet holes, thereby making the spraying of the cold salt water more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of radiofrequency ablation catheter;

[0023] Figure 2 This is an enlarged view of area A;

[0024] Figure 3 This is an enlarged view of area B;

[0025] Figure 4 is a cross-sectional schematic diagram of a radiofrequency ablation catheter at a first angle;

[0026] Figure 5 This is an enlarged view of area C;

[0027] Figure 6 is a cross-sectional schematic diagram of a second angle of a radiofrequency ablation catheter;

[0028] Figure 7 This is an enlarged view of area D;

[0029] Figure 8 This is an enlarged view of area E. DETAILED DESCRIPTION

[0030] Reference numerals: 1 electrode head; 2 tube portion; 2.1 injection channel; 2.1.1 first channel portion; 2.1.2 second channel portion; 2.2 first wire pulling channel; 2.3 first wire channel; 2.4 second wire channel; 2.5 second wire pulling channel; 2.6 flexible partition portion;

[0031] 3.1 first liquid outlet channel; 3.1.1 straight channel; 3.1.2 arc channel; 3.2 second liquid outlet channel; 3.3 annular groove; 3.4 surrounding plate; 3.5 liquid outlet hole;

[0032] 4.1 first spring; 4.2 second spring; 4.3 pressure sensor;

[0033] 5.1 end plate; 5.1.1 pressing block; 5.2 surrounding plate; 5.3 first connecting hole; 5.4 second connecting hole; 5.5 bracket part; 5.6 second pull wire.

[0034] As shown in the figure, a cold saline irrigated radiofrequency ablation catheter comprises an electrode head 1 and a tube 2 connected to the electrode head 1, wherein the electrode head 1 has an ablation electrode, and the tube 2 has an injection channel 2.1, a first wire channel 2.3 and a first pull-wire channel 2.2, wherein the first wire channel 2.3 has a first wire connected to the ablation electrode, and the first pull-wire channel 2.2 has a first pull-wire capable of bending the electrode head 1 installed therein; the tube 2 has a plurality of first liquid outlet channels 3.1 and a plurality of second liquid outlet channels 3.2, and the first liquid outlet channels 3.1 and the second liquid outlet channels 3.2 are both connected to the injection channel 2.1. The plurality of first liquid outlet channels 3.1 are equally spaced in a ring shape, and the plurality of second liquid outlet channels 3.2 are equally spaced in a ring shape.

[0035] The injection channel 2.1 includes a first channel portion 2.1.1 and a second channel portion 2.1.2 connected to the first channel portion 2.1.1. One end of the first channel portion 2.1.1 is closed, and the other end is connected to the second channel portion 2.1.2. The first liquid outlet channel 3.1 and the second liquid outlet channel 3.2 are both connected to the first channel portion 2.1.1. A blocking portion is installed in the first channel portion 2.1.1, and the blocking portion includes an end plate 5.1, a circumferential plate 5.2 connected to the end plate 5.1, and a The bracket portion 5.5 is connected to a second pull wire 5.6, a first spring 4.1 is connected between the end of the first channel portion 2.1.1 close to the electrode head 1 and the end plate 5.1, and a second spring 4.2 is connected between the end of the circumferential plate 5.2 and the end of the first channel portion 2.1.1 away from the electrode head 1; a pressure sensor 4.3 is installed at the end of the first channel portion 2.1.1 close to the electrode head 1, and the end plate 5.1 has a groove portion, and a pressing force that can press the pressure sensor is fixed at the groove portion. The pipe part 2 has an annular groove 3.3, and a cylindrical surrounding plate 3.4 connected to the pipe part is fixed to the annular groove 3.3. The second liquid outlet channel 3.2 is connected to the annular groove 3.3, and the surrounding plate 3.4 has a plurality of liquid outlet holes 3.5; the circumferential plate 5.2 has a plurality of first communicating holes 5.3 distributed in an annular manner with equal spacing, and a plurality of second communicating holes 5.4 distributed in an annular manner with equal spacing, the number of the first communicating holes 5.3 is equal to the number of the first liquid outlet channels 3.1 and the two correspond one to one, and the second communicating holes 5.3 are connected ... The number of the second communicating holes 5.4 is equal to the number of the second liquid outlet channels 3.2 and the two correspond one to one; the blocking portion can be in a first state and a second state, in the first state, each first communicating hole 5.3 is connected to the corresponding first liquid outlet channel 3.1, and all the second liquid outlet channels 3.2 are closed by the circumferential plate; in the second state, all the first liquid outlet channels 3.1 are closed by the circumferential plate, and each second communicating hole 5.4 is connected to the corresponding second liquid outlet channel 3.2; when there is no external force, the blocking portion is in the first state.

[0036] The bracket part 5.5 includes four radial rods distributed in an annular shape with equal spacing. The number of the first liquid outlet channel 3.1, the second liquid outlet channel 3.2, the first connecting hole 5.3 and the second connecting hole 5.4 are all 8. The electrode head is provided with a temperature sensor, and the tube part has a second wire channel 2.4, and the second wire channel 2.4 has a second wire connected to the temperature sensor. The first liquid outlet channel 3.1 includes a straight channel 3.1.1 and an arc channel 3.1.2 connected to the straight channel 3.1.1, and the angle between the axis of the straight channel 3.1.1 and the axis of the first channel part 2.1.1 is less than 30 degrees. The tube part 2 also has a second wire pulling channel 2.5, the second wire pulling channel 2.5 is connected to the second channel part 2.1.2, and the second wire pulling channel 2.5 has a flexible partition 2.6, the second wire 5.6 passes through the second wire pulling channel 2.5, and the second wire 5.6 passes through the flexible partition 2.6 and is sealed and connected to the flexible partition 2.6. The liquid outlet holes 3.5 have multiple circles, and the liquid outlet holes 3.5 in each circle are distributed in a circular shape with equal intervals.

[0037] As shown in the figure, in the radiofrequency ablation catheter of the present application, the ablation electrode at the electrode head can be used for radiofrequency ablation treatment, and the first pull wire can be used to adjust the bend of the electrode head. The injection channel can be used to pass cold saline. When there is no external force, the first liquid outlet channel is connected to the first connecting hole, so that the first liquid outlet channel is used to spray cold saline at this time, and the spraying direction is sprayed toward the front end. It is also possible to pull the pull wire backward so that the blocking part can be moved backward, so that the first connecting hole is closed, and the second connecting hole is connected to the second liquid outlet channel, so that the cold saline passes through the second connecting hole and the second liquid outlet channel into the annular groove and sprays out from the liquid outlet. Since the liquid outlet holes are evenly distributed, the spraying of the cold saline is also relatively uniform. Therefore, the radiofrequency ablation catheter has two cold saline spraying modes to meet the use needs of different scenarios. And the flexible partition separates the cold saline, and at the same time, the flexibility of the flexible partition makes the pulling of the second pull wire unimpeded.

[0038] Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be appreciated by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. Cold saline irrigated radiofrequency ablation catheter, characterized in that: It includes an electrode head and a tube part connected to the electrode head, the electrode head is provided with an ablation electrode, the tube part has an injection channel, a first wire channel and a first pull-wire channel, the first wire channel has a first wire connected with the ablation electrode, the first pull-wire channel has a first pull-wire capable of bending the electrode head installed therein; the tube part has a plurality of first liquid outlet channels and a plurality of second liquid outlet channels, the first liquid outlet channels and the second liquid outlet channels are both connected with the injection channel.

2. The cold saline irrigated radiofrequency ablation catheter according to claim 1, characterized in that: The plurality of first liquid outlet channels are evenly spaced in a ring shape, and the plurality of second liquid outlet channels are evenly spaced in a ring shape.

3. The cold saline irrigated radiofrequency ablation catheter according to claim 2, characterized in that: The injection channel includes a first channel portion and a second channel portion connected to the first channel portion, one end of the first channel portion is closed, and the other end is connected to the second channel portion, and the first liquid outlet channel and the second liquid outlet channel are both connected to the first channel portion; a blocking portion is installed in the first channel portion, and the blocking portion includes an end plate, a circumferential plate connected to the end plate, and a bracket portion connected to the circumferential plate, and the bracket portion is connected to a second pull wire, a first spring is connected between an end of the first channel portion close to the electrode head and the end plate, and a second spring is connected between an end of the circumferential plate and an end of the first channel portion away from the electrode head; a pressure sensor is installed at an end of the first channel portion close to the electrode head, and the end plate has a groove portion, and a pressing block capable of pressing the pressure sensor is fixed to the groove portion; the tube portion has an annular groove, and the annular groove A circular cylindrical surrounding plate connected to the tube portion is fixed thereon, the second liquid outlet channel is connected to the annular groove, and the surrounding plate has a plurality of liquid outlet holes; the circumferential plate has a plurality of first communicating holes distributed in a circular shape with equal spacing, and a plurality of second communicating holes distributed in a circular shape with equal spacing, the number of the first communicating holes is equal to the number of the first liquid outlet channels and the two correspond one to one, the number of the second communicating holes is equal to the number of the second liquid outlet channels and the two correspond one to one; the blocking portion can be in a first state and a second state, in the first state, each first communicating hole is connected to the corresponding first liquid outlet channel, and all the second liquid outlet channels are closed by the circumferential plate; in the second state, all the first liquid outlet channels are closed by the circumferential plate, and each second communicating hole is connected to the corresponding second liquid outlet channel; when there is no external force, the blocking portion is in the first state.

4. The cold saline irrigated radiofrequency ablation catheter according to claim 3, characterized in that: The support portion includes four radial rods that are distributed in an annular shape with equal intervals.

5. The cold saline irrigated radiofrequency ablation catheter according to claim 3, characterized in that: The number of the first liquid outlet channel, the second liquid outlet channel, the first connecting hole and the second connecting hole are all eight.

6. The cold saline irrigated radiofrequency ablation catheter according to claim 3, characterized in that: The electrode head is provided with a temperature sensor, the tube portion is provided with a second wire channel, and the second wire channel is provided with a second wire connected with the temperature sensor.

7. The cold saline irrigated radiofrequency ablation catheter according to claim 3, characterized in that: The first liquid outlet channel includes a straight channel and a curved channel connected to the straight channel, and the angle between the axis of the straight channel and the axis of the first channel portion is less than 30 degrees.

8. The cold saline irrigated radiofrequency ablation catheter according to claim 3, characterized in that: The tube portion also has a second wire pulling channel, which is communicated with the second channel portion, and has a flexible partition portion in the second wire pulling channel. The second wire pulling wire passes through the second wire pulling channel, and the second wire pulling wire passes through the flexible partition portion and is sealed and connected to the flexible partition portion.

9. The cold saline irrigated radiofrequency ablation catheter according to claim 3, characterized in that: The liquid outlet holes have multiple circles, and the liquid outlet holes in each circle are distributed in a circular shape with equal intervals.

Images