CN216933438U - Ablation catheter with built-in flow channel and ablation system - Google Patents

Abstract

The application discloses ablation catheter of built-in runner, including the sheath pipe and install in the electrode of sheath pipe distal end, wear to be equipped with the conveyer pipe that is used for carrying heat transfer medium in the sheath pipe and be used for carrying the wire of radio frequency energy, the distal end of electrode is the most advanced that radially draws in, the near-end side of electrode be equipped with be used for with the connecting pipe that the sheath pipe was pegged graft, the inside cavity of connecting pipe, the inside of electrode has heat transfer medium runner just the heat transfer medium runner passes through the connecting pipe with the conveyer pipe intercommunication, the wire is connected to the near-end side of connecting pipe. According to the technical scheme, the electrode is optimized in structure, the function of the electrode is integrated, the heat exchange medium channel can be used for pouring the heat exchange medium into the ablation tissue, and the radio frequency energy can be continuously output.

Description

Ablation catheter with built-in flow channel and ablation system

Technical Field

The application relates to the field of medical equipment, in particular to an ablation catheter with a built-in flow channel and an ablation system.

Background

Lung cancer is one of the most common malignancies. In clinical treatment, surgical resection is still the first choice for treating early stage lung cancer. However, lung cancer patients who are older, have weak constitution, have poor cardiopulmonary function or are complicated, are not suitable for or resistant to conventional surgical resection. Thus, many local treatment methods, such as minimally invasive ablation of tumors, are in force. The tumor minimally invasive Ablation of the lung comprises Radio Frequency Ablation (RFA), cryoablation, microwave Ablation and the like, wherein only the Radio Frequency Ablation is listed by the non-small cell lung cancer clinical guidance of the United states national comprehensive cancer network.

The principle of the radio frequency ablation is that alternating high-frequency current with frequency less than 30MHz (usually 460-480 kHz) is applied to enable ions in tumor tissues to generate high-speed oscillation and rub with each other, radio frequency energy is converted into heat energy, and therefore coagulative necrosis of tumor cells occurs. In rf ablation therapy, the device used is an rf ablation catheter that is percutaneously punctured with an electrode at its distal end to deliver rf energy to the tissue surrounding the site of penetration. When the radiofrequency ablation therapy is carried out, the radiofrequency ablation catheter is an electrode for outputting radiofrequency energy, is connected with a radiofrequency generator, and is punctured into a target tumor through a puncture point under the guidance of B ultrasonic or CT. The neutral electrode plate is also connected with a radio frequency generator, and is attached to the proper part of the patient body. When the foot switch on the radio frequency generator is stepped on, the radio frequency ablation catheter is communicated with the neutral electrode plate, and high-frequency current acts on human tissues between the radio frequency ablation catheter and the neutral electrode plate, so that tumor cells contacted with the electrode at the far end of the radio frequency ablation catheter are coagulated, denatured and necrotized.

The inventor finds that when the existing radio frequency ablation catheter for the lung works, the temperature of the electrode part is increased too fast, and the tissues near the electrode are dried and carbonized to form scabs, so that the ablation is stopped and is not thorough. Moreover, the "scab" tissue adheres to the electrodes, which can damage surrounding organs when the device is pulled out.

The head of the existing radio frequency ablation catheter applied to the lung can not be bent mostly, so that the front electrode of the radio frequency ablation catheter can not reach the target position on the side conveniently.

The existing radio frequency ablation catheter can not effectively control the ablation range and can not judge whether the ablation range is proper or not in time. The ablation range is small, the ablation is not thorough, and the risk of relapse exists; the ablation range is large, and surrounding normal tissues and organs can be injured by mistake.

The existing radio frequency ablation operation can not effectively judge the accurate position of the front end electrode of the radio frequency ablation catheter even under the guidance of B ultrasonic or CT. The CT images are a limited number of cross-sectional images obtained by X-ray scanning, and at some angles, it appears that the front electrode is placed at the target region, but the actual position may not be correct, and only the front electrode is overlapped in the projection direction, so that the position of the front electrode is difficult to determine, and the positioning accuracy is insufficient.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the application discloses an ablation catheter with a built-in flow channel, which comprises a sheath tube and an electrode arranged at the far end of the sheath tube, wherein a conveying pipe for conveying a heat exchange medium and a lead for conveying radio frequency energy are arranged in the sheath tube in a penetrating way,

the electrode is characterized in that the far end of the electrode is a tip end which is folded in the radial direction, a connecting pipe which is used for being connected with the sheath pipe in an inserting mode is arranged on the near end side of the electrode, the connecting pipe is hollow, a heat exchange medium flow passage is arranged inside the electrode and is communicated with the conveying pipe through the connecting pipe, and the conducting wire is connected to the near end side of the connecting pipe.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

Optionally, the connecting tube and the electrode are of an integral structure, and the circumferential size of the connecting tube is slightly smaller than that of the electrode.

The connecting pipe and the electrode of a body structure can improve the connection strength, and meanwhile, the connection of materials is convenient, and a structural foundation is provided for an energy input interface serving as the electrode for the connecting pipe.

Optionally, a positioning step is arranged between the connecting tube and the electrode, the distal end side of the sheath tube abuts against the positioning step, and the outer peripheral surface of the sheath tube is flush with the outer peripheral surface of the electrode.

The positioning steps can improve the assembly precision of the positioning steps and the peripheral surface of the positioning steps can avoid unnecessary damage to surrounding tissues in the intervention process.

Optionally, a constraining tube covering the delivery tube and the guide wire is further disposed in the sheath, and in a radial direction of the sheath, a distal end side of the constraining tube is located between the connecting tube and the sheath.

The restraint pipe can further restrain the pipeline in the sheath pipe, avoids the problem that the inside of the sheath pipe is too loose due to the limitation of the size of the connecting pipe, and can also improve the connection strength of the conveying pipe, the conducting wire and the connecting pipe, and the possibility of accidental loosening is avoided.

Optionally, the axial length of the constraining tube is equal to or close to the axial length of the electrode.

Adjustment of the axial length of the constraining tube can alter the mechanical performance of the distal end of the ablation catheter.

Optionally, the guide lines are provided in a plurality and symmetrically distributed with respect to the delivery pipe.

The lead may be used to transmit information in addition to delivering radio frequency energy, providing a structural basis for information acquisition during the ablation process.

Optionally, the heat exchange medium flow channel includes a main flow channel extending along the axis of the electrode and a plurality of branch flow channels communicating with different positions of the main flow channel; the conveying pipe extends into the main runner to avoid each branch runner.

The branch flow channels can further improve the balance effect of the heat exchange medium, and the relative position relationship between the conveying pipe and each flow channel can realize the pre-distribution of the heat exchange medium.

Optionally, the primary flow channel extends along the axis of the electrode and is internally smooth.

The smooth main flow channel can reduce the conveying resistance of the heat exchange medium, and can adapt to different installation depths of the conveying pipe simultaneously, so that a structural foundation is provided for different installation schemes.

Optionally, the axial length of the conveying pipe located in the connecting pipe is equal to or close to the axial length of the connecting pipe.

The conveyer pipe is located the axial length in the connecting tube is big then both cooperation effects are inseparabler, and the influence that occupies the space to heat transfer medium runner is just big more simultaneously, and the design needs in the aspect of joint strength, spatial layout and heat transfer medium transport etc. can be compromise to the scheme that sets up of this embodiment.

The present application also discloses an ablation system comprising:

the ablation catheter in the technical scheme;

a control handle for manipulating the ablation catheter.

According to the technical scheme, the electrode is optimized in structure, the function of the electrode is integrated, the heat exchange medium channel can be used for pouring the heat exchange medium into the ablation tissue, and the radio frequency energy can be continuously output.

Specific advantageous technical effects will be further explained in conjunction with specific structures or steps in the detailed description.

Drawings

FIG. 1 is a schematic view of a distal portion of an ablation catheter with a built-in flow channel in one embodiment;

FIG. 2 is a schematic view of the internal structure of the distal portion of the ablation catheter of FIG. 1 with a built-in flow channel;

fig. 3 is an exploded view of a distal portion of the ablation catheter of the built-in flow channel of fig. 1;

FIG. 4 is a schematic illustration of the distal portion of the ablation catheter of FIG. 3 in an exploded internal assembled relationship;

FIG. 5 is an overall block diagram of an embodiment of an ablation catheter with a built-in flow channel;

FIG. 6 is an overall block diagram of another embodiment of an ablation catheter with a built-in flow channel;

FIG. 7 is an enlarged view of the distal end of the ablation catheter of FIG. 6 with a built-in flow channel;

fig. 8 is a schematic cross-sectional view of the ablation catheter with built-in flow channel of fig. 6;

fig. 9 is an overall structural view of an ablation catheter with a built-in flow channel in yet another embodiment.

The reference numerals in the figures are illustrated as follows:

1. an electrode; 111. a connecting pipe; 115. a main flow channel; 119. infiltrating the pores; 121. branching the flow channel; 131. positioning a step; 21. a delivery pipe; 22. a wire; 23. a restraint tube;

2. a sheath tube; 3. protecting the pipe; 4. a first stretch bending assembly; 5. a second stretch bending assembly; 6. a brine connection; 7. an ablation instrument connector; 21. a metal tube; 22. a temperature sensor; 23. a heat exchange medium conveying pipe; 24. an electrode lead; 25. a Y-shaped handle; 26. a handle end cap; 27. a connector; 28. a luer fitting;

30. a 7-type handle; 31. a connector; 32. a heat exchange medium conveying pipe; 321. a luer fitting.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, the application discloses an ablation catheter with a built-in flow channel, which comprises a sheath 2 and an electrode 1 arranged at the distal end of the sheath 2, wherein a delivery pipe 21 for delivering a heat exchange medium and a lead 22 for delivering radio frequency energy penetrate through the sheath 2,

the distal end of the electrode 1 is a tip end which is radially folded, a connecting pipe 111 which is used for being connected with the sheath tube in an inserting mode is arranged on the proximal end side of the electrode 1, the connecting pipe 111 is hollow, a heat exchange medium flow channel is arranged inside the electrode 1 and communicated with the conveying pipe 21 through the connecting pipe 111, and the lead 22 is connected to the proximal end side of the connecting pipe 111.

The tip gradually converges in the direction of extension. The shape convergence facilitates the advancement of the puncture in the body, the diameter or outer contour tapering distally during convergence, and the tendency to taper may be constant (gradual convergence, see the figures) or variable (step convergence). The tip is formed by beveling a plurality of piercing faces against the electrode. As shown in the drawings, the number of piercing faces is preferably 3. Referring to the drawings, the central axis of the cylinder passes through at least two piercing surfaces. The shape of the far end of the electrode 1 can be changed more by using one or more surfaces for beveling, the beveling means that the beveling surface is not parallel or perpendicular to the axial direction of the electrode 1, and the parallel surface can not be beveled, while the perpendicular surface means that the far end surface of the electrode 1 is a plane, such as a cylinder or a truncated cone structure. In some embodiments. The central axis only passes through one puncture surface; in the exemplary embodiment shown in the figures, the central axis passes through the intersection of the three puncturing surfaces, i.e. the central axis passes through the three puncturing surfaces.

The connecting pipe 111 realizes the connection of the sheath pipe and the electrode 1 on the components and also realizes the communication of the conveying pipe 21 and the heat exchange medium flow passage on the pipeline. Through the structural optimization of the electrode 1, the function integration of the electrode 1 is realized, and the heat exchange medium channel can be used for pouring a heat exchange medium into the ablation tissue, so that the radio frequency energy can be continuously output.

The connection tube 111 and the electrode 1 may be made of different materials or may have a separate structure, and may be manufactured through an assembly process, and when the connection tube 111 cannot transmit an electrical signal or radio frequency energy, the connection tube 111 may be provided with an electrical component to implement the function of the lead 22. In one embodiment, the connection tube 111 and the electrode 1 are integrated. The connecting pipe 111 and the electrode 1 of the integrated structure can improve the connection strength, facilitate the synchronization of materials, and provide a structural foundation for the connecting pipe 111 to serve as an energy input interface of the electrode 1. In this solution, the lead wire 22 is connected to the proximal side of the connection tube 111, the connection tube 111 itself transmitting the radio frequency energy to the electrode 1. Dimensionally, the connecting tube 111 has a circumferential dimension slightly smaller than that of the electrode 1. This set up and realize comparatively smooth external shape when making things convenient for the cover of sheath pipe to establish. Further, a positioning step 131 is arranged between the connecting tube 111 and the electrode 1, the distal end side of the sheath abuts against the positioning step 131, and the outer peripheral surface of the sheath is flush with the outer peripheral surface of the electrode 1. The positioning steps 131 can improve the assembly precision of the positioning steps and the positioning steps, unnecessary damage to surrounding tissues can be avoided in the parallel and level peripheral surface intervention process, and meanwhile, the passing difficulty of the instrument can be reduced.

In the matching relationship, the delivery tube 21 and the connection tube 111 can be positioned by matching in size, or can be connected by bonding, welding, soldering, etc. Dimensionally, the axial length of the delivery tube 21 within the connecting tube 111 is equal to or close to the axial length of the connecting tube 111. That is, it is changed that a positioning step 131 is provided between the connection tube 111 and the electrode 1, and the end surface of the distal end of the delivery tube 21 corresponds to the positioning step 131. The axial length that conveyer pipe 21 is located in connecting pipe 111 is big then both cooperation effects are inseparabler, and the influence that occupies to the space of heat transfer medium runner is just big more simultaneously, and the design needs in the aspect of joint strength, spatial layout and heat transfer medium transport can be compromise to the scheme that sets up of this embodiment. Meanwhile, the length of the delivery tube 21 influences the overall axial length of the electrode 1 to a certain extent, thereby having a certain influence on the overall motion performance of the distal end of the ablation catheter. Wherein the proximity referred to above means that the axial length of the delivery tube 21 inside the connection tube 111 is 75% to 125% of the axial length of the connection tube 111.

Referring to the embodiment shown in fig. 3, a constraining tube 23 is further provided inside the sheath tube to wrap the delivery tube 21 and the guide wire 22, and the distal end side of the constraining tube 23 is located between the connection tube 111 and the sheath tube in the radial direction of the sheath tube. The restraining tube 23 can further restrain the pipeline in the sheath tube, so that the problem that the inner part of the sheath tube is too loose due to the size limitation of the connecting tube 111 is avoided, and meanwhile, the restraining tube 23 can also improve the connection strength of the conveying tube 21, the lead 22 and the connecting tube 111, and the possibility of accidental loosening is avoided. In a specific manner, the constraint tube 23 may be configured as a gap fit with the connection tube 111, and may also wrap the connection tube 111 through its own elasticity, or may also wrap the connection tube 111 through the sheath tube. The particular connection depends on the strength requirements of the fitting of the tube and the electrode 1. In detail, the axial length of the constraining tube 23 is equal to or close to the axial length of the electrode 1. Adjustment of the axial length of the constraint tube 23 can alter the mechanical behavior of the distal end of the ablation catheter. Wherein close-in means that the axial length of the constraining tube 23 is 75% to 125% of the axial length of the electrode 1.

In one embodiment, the conducting wires 22 are disposed in a plurality and symmetrically distributed with respect to the conveying pipe 21. Wherein the plurality of wires 22 can be used for delivering rf energy to the electrode 1, and in an embodiment, the wires 22 can be used for transmitting information besides delivering rf energy, so as to provide a structural basis for information acquisition during the ablation process. The transmitted information may be temperature information, impedance information, etc. at the electrode 1. Further, a temperature sensor may be disposed on the electrode 1.

In the arrangement of the heat exchange medium flow channel, referring to an embodiment, the heat exchange medium flow channel includes a main flow channel 115 extending along the axis of the electrode 1 and a plurality of branch flow channels 121 communicating with different positions of the main flow channel 115; the delivery pipe 21 extends into the main flow passage 115 to escape from each branch flow passage. In a specific form of avoidance, referring to the embodiment shown in the drawings, the delivery tube 21 is retracted compared to the branch flow path 121 to achieve avoidance. Further, a positioning step 131 is arranged between the connecting tube 111 and the electrode 1, and the end surface of the distal end of the conveying tube 21 corresponds to the positioning step 131, so as to avoid the conveying tube 21 from the branch flow channel 121. The branch flow channel 121 can further improve the balance effect of the heat exchange medium, and the relative position relationship between the conveying pipe 21 and each flow channel can realize the pre-distribution of the heat exchange medium. As shown, the primary channel 115 extends along the axis of the electrode 1 and is internally smooth. Smooth main flow channel 115 can reduce heat transfer medium's transport resistance, can also adapt to different conveyer pipe 21 mounting depth simultaneously, provides the structure basis for different installation schemes.

As will be appreciated, the present application also discloses an ablation system comprising:

the ablation catheter in the technical scheme;

and the control handle is used for controlling the ablation catheter.

In a particular product, the flow channel-containing ablation catheter generally includes an insertion portion and a handle portion (i.e., control handle as described above) as can be seen with reference to fig. 5. Wherein:

the insertion portion includes: an electrode 1, a sheath 2 connected to the electrode 1, and parts located inside the electrode 1 and the sheath 2.

The handle portion includes: a saline connector 6 and an ablator connector 7. The handle portion is used to conduct the insertion portion to the saline storage location and the ablator to which the saline fitting 6 is connected.

A wire is passed through the sheath 2 to connect the electrode 1 to an ablator connector 7 for connecting the electrode 1 to an ablator. The ablation instrument is also connected with a neutral electrode plate, and before ablation treatment is started, the neutral electrode plate is attached to a proper part of a human body, so that a loop can be formed among the electrode 1, the ablation instrument, the neutral electrode plate and a patient, and ablation is performed on ablation tissues contacted with the electrode 1. In use, the electrode 1 of the ablation catheter with the built-in flow channel enters the lung parenchyma through a hole punctured in advance on the bronchial wall near a focus to perform radio frequency ablation under the guidance of bronchial navigation and through a forceps channel of a bronchoscope.

One end of the electrode 1 is fixedly connected with the sheath tube 2, and the other end is directly embedded into the ablation tissue. The fixed end of the electrode 1 and the sheath 2 is provided with a saline connecting pipe extending into the body of the sheath 2, and the saline connecting pipe is connected to a saline connector 6 through a saline pipe so as to input physiological saline into the electrode 1. As shown in fig. 4, the electrode 1 is provided with a plurality of saline holes (i.e. infiltration holes 119), and the physiological saline flowing into the saline connecting tube can enter the saline holes and flow out through the pore channels inside the electrode 1 after entering the electrode 1, so as to form an infiltration effect on the surface of the electrode 1. A layer of physiological saline film is formed on the surface of the electrode 1, and in the ablation process, the physiological saline is filled between the electrode 1 and the ablation tissue, so that the phenomenon that the electrode 1 is wrapped in vacuum by scabbing to cause the impedance to be suddenly increased is avoided.

In order to ensure the infiltration effect, the infiltration holes 119 are multiple, preferably, multiple groups, for example, 2 to 4 groups, are distributed in the axial direction of the electrode 1, and the infiltration holes 119 in each group are distributed multiple, for example, 2 to 8, preferably 4 to 6, in the circumferential direction of the electrode 1. The handle part can also be provided with a first stretch bending component 4 and a second stretch bending component 5, so as to realize the proximal control of the electrode 1.

Referring also to fig. 6-8, the flow channel-containing ablation catheter, as a whole, includes an insertion portion and a handle portion (i.e., control handle as described above). Wherein:

the insertion portion includes: the electrode 1, the metal tube 21 connected with the electrode 1, and the parts positioned in the electrode 1 and the metal tube 21, and a temperature sensor is arranged at the position adjacent to the electrode 1.

The shape of the distal end of the electrode 1 is converged to form a sharp point, the metal tube 21 is similar to the sheath tube 2 in structure and position, but the metal tube 21 has certain strength and can be used as a puncture needle together with the electrode 1, for example, the electrode can be directly punctured into the lung through the extrathoracic wall to perform ablation.

In this embodiment, the electrode 1 has a heat exchange medium channel, such as the main channel 115, and a branch channel. The branch flow passages communicate with different positions of the main flow passage 115.

Each branch flow passage extends to the outer surface of the electrode 1 to form a wetting hole 119.

The electrode 1 is provided with two mounting holes for accommodating a temperature sensor and a corresponding electrode lead 24, the near end of the electrode 1 is provided with a connecting pipe 111 communicated with a heat exchange medium flow passage inside the electrode 1, and a heat exchange medium conveying pipe 23 is butted with the connecting pipe 111.

The handle portion generally comprises a Y-handle 25, a handle end cap 26, and a luer 28.

The circuit part extends out of the Y-shaped handle 25 and enters into a connector 27, the connector 27 can be connected with an external circuit in a plug-in and pull-out manner through a common interface, and the heat exchange medium conveying pipe 23 can be connected with a heat exchange medium conveying device through a luer connector 28 to supply heat exchange medium to the electrode 1.

According to the length of the path traveled by the electrode 1 in the body, components with corresponding performance can be butted at the proximal end of the electrode 1, for example, the path in the body is longer and needs to be turned, the mode of the sheath tube 2 can be adopted, the sheath tube 2 has better flexibility and radial supporting capability and can adapt to larger bending, and in addition, the bending degree and the posture of the electrode 1 can be adjusted by combining the first stretch bending component 4, the second stretch bending component 5 and the matched pull wire. Also for example, if the path in the body is short or a puncture is required, a metal tube 21 having a certain rigidity is used.

The electrode 1 and the sheath tube 2 or the metal tube 21 can be fixedly connected by the existing means, such as welding, bonding, riveting or by using an intermediate connecting piece, and the like, and the connecting part can be axially butted or partially nested with each other, and the outer wall is preferably flat and smooth when the electrodes are nested with each other, so that edges and corners are avoided.

The aperture of the infiltration holes 119 is 0.1-0.3 mm. The proper aperture is more beneficial to the distribution and formation of the heat exchange medium protective film, and when the shape of the infiltration hole 119 is non-circular, the conversion can be carried out according to the area of the circular hole so as to ensure the flow of the heat exchange medium at the position of the infiltration hole 119.

Referring also to fig. 9, the flow path-containing ablation catheter, as a whole, includes an insertion portion and a handle portion (i.e., control handle as described above). Wherein:

the insertion portion includes: the electrode 1, the metal tube 21 connected with the electrode 1, and the parts positioned in the electrode 1 and the metal tube 21, and a temperature sensor is arranged at the position adjacent to the electrode 1.

The shape of the distal end of the electrode 1 is converged to form a sharp point, the metal tube 21 is similar to the sheath tube 2 in structure and position, but the metal tube 21 has certain strength and can be used as a puncture needle together with the electrode 1, for example, the electrode can be directly punctured into the lung through the extrathoracic wall to perform ablation.

The handle portion consists essentially of a 7-style handle 30. The circuit part extends out of the 7-type handle 30 and then enters into the connector 31, the connector 31 can be connected with an external circuit in a plugging and unplugging mode through a common interface, and the heat exchange medium delivery pipe 32 can be connected with a heat exchange medium delivery device through a luer connector 321 to supply heat exchange medium to the electrode 1.

Each of the above ablation systems may further comprise:

the heat exchange medium delivery device is used for providing a heat exchange medium to the peripheral part of the electrode 1 of the ablation catheter;

and correspondingly driving a control module of the heat exchange medium conveying device according to the impedance information or the temperature information of the loop where the electrode 1 is positioned in the ablation catheter.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. Features of different embodiments are shown in the same drawing, which is to be understood as also disclosing combinations of the various embodiments concerned.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.

Claims (10)

1. The ablation catheter with the built-in runner comprises a sheath tube and an electrode arranged at the far end of the sheath tube, and is characterized in that a conveying pipe for conveying a heat exchange medium and a lead for conveying radio frequency energy are arranged in the sheath tube in a penetrating way,

the far-end of the electrode is a tip end which is folded in the radial direction, a connecting pipe which is used for being connected with the sheath pipe in an inserting mode is arranged on the near-end side of the electrode, the connecting pipe is hollow, a heat exchange medium flow channel is arranged inside the electrode and communicated with the conveying pipe through the connecting pipe, and the conducting wire is connected to the near-end side of the connecting pipe.

2. The ablation catheter of claim 1, wherein the connecting tube is of unitary construction with the electrode and has a circumferential dimension slightly smaller than the electrode.

3. The ablation catheter with built-in flow channel as claimed in claim 2, wherein a positioning step is provided between the connecting tube and the electrode, the distal end side of the sheath abuts against the positioning step, and the outer circumferential surface of the sheath is flush with the outer circumferential surface of the electrode.

4. The indwelling flow channel ablation catheter according to claim 1, further comprising a constraining tube covering the delivery tube and the guide wire, wherein a distal end of the constraining tube is located between the connecting tube and the sheath in a radial direction of the sheath.

5. The ablation catheter of claim 4, wherein the constraining tube has an axial length equal to or close to the axial length of the electrode.

6. The ablation catheter with built-in flow channel of claim 1, wherein the guide wire is provided in a plurality of pieces and symmetrically distributed with respect to the delivery tube.

7. The ablation catheter with built-in flow channel as claimed in claim 1, wherein the heat exchange medium flow channel comprises a main flow channel extending along the axis of the electrode and a plurality of branch flow channels communicating with different positions of the main flow channel; the conveying pipe extends into the main runner to avoid the branch runners.

8. The ablation catheter of claim 7, wherein the primary flow channel extends along an electrode axis and is internally smooth.

9. The ablation catheter with built-in flow channel as claimed in claim 1, wherein a positioning step is provided between the connecting tube and the electrode, and the end surface of the distal end of the delivery tube corresponds to the positioning step.

10. An ablation system, comprising:

the ablation catheter of any of claims 1 to 9;

a control handle for manipulating the ablation catheter.

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