CN114699163A - A radiofrequency ablation catheter with a cooling bladder - Google Patents

Abstract

The invention provides a radiofrequency ablation catheter with a cooling bladder, which includes a catheter end and a connecting pipe connected in sequence; the catheter end includes: an outer tube part provided with a hollow cavity, a cooling bladder set in the hollow cavity, and a The connecting piece for fixing the outer tube part and the cooling bladder; the cooling bladder is open at one end and has elasticity; the connecting piece includes a proximal end and a distal end, the outer tube part and the cooling bladder are connected with the distal end, and the proximal end is used for docking with the connecting tube; A liquid inlet tube, a liquid outlet tube and a wire tube are provided; when the RF electrode is used, the cooling bag is injected into the circulating cooling liquid to expand, closely fit the inside of the electrode, and cool the electrode; The four-quadrant electrode is shaped like a four-quadrant. After the cooling capsule is filled with water, it can adapt to the helical shape to expand inside the catheter end, and closely fit the inside of the electrode to cool down each electrode, control the heat energy released by the electrode itself in the working state, and reduce the damage to the blood vessel. damage.

Description

A radiofrequency ablation catheter with a cooling bladder

technical field

The invention relates to the technical field of medical equipment, and relates to a radiofrequency ablation catheter with a cooling bladder.

Background technique

Refractory hypertension refers to that blood pressure remains above the target level after at least 4 weeks of tolerable and adequate doses of reasonable antihypertensive drugs on the basis of improving lifestyle, and there is currently no effective treatment plan. Renal sympathetic denervation, as a treatment for refractory hypertension, has been confirmed by basic experiments in the pathophysiological mechanism.

Renal sympathetic denervation is a percutaneous ablation of the renal sympathetic nerve through the renal artery. Renal sympathetic denervation can effectively reduce the sympathetic activity of the whole body and the local kidney, and has a good therapeutic effect on refractory hypertension.

However, in the process of ablating the nerve outside the blood vessel through the catheter guide electrode in the blood vessel, the release of the electrode may not be targeted, and the heat energy released will cause irreversible damage to the blood vessel. Take anticoagulants; in severe cases, blood vessels can close, causing more serious damage.

SUMMARY OF THE INVENTION

In order to achieve the above object, the technical scheme adopted in the present invention is:

A radiofrequency ablation catheter with a cooling bladder, comprising a catheter tip and a connecting pipe connected in sequence;

The catheter tip includes: an outer tube part provided with a hollow cavity, a cooling bladder set in the hollow cavity, and a connecting piece for fixing the outer tube part and the cooling bladder;

One end of the cooling bladder is open and elastic; the connecting piece includes a proximal end and a distal end, the outer tube part and the cooling bladder are connected to the distal end, and the proximal end is used for docking with the connecting pipe; the connecting pipe is provided with a liquid inlet pipe and a liquid outlet pipe and conduit;

The connecting piece is provided with a liquid inflow channel, a liquid outflow channel and a line channel; the liquid inflow channel, the liquid outflow channel and the line channel are respectively connected with the liquid inlet pipe, the liquid outlet pipe and the line pipe.

Preferably, one or more ablation electrodes are disposed on the outside of the outer tube portion, and each ablation electrode is respectively connected with an electrode wire;

The electrode wire extends toward the connecting piece along the inner surface of the hollow cavity, and enters the wire tube through the wire channel through the connecting piece.

Preferably, the distal end of the connecting piece is provided with an extension tube, the extension tube is connected with the liquid inlet tube, and the length of the extension tube is smaller than the length of the hollow cavity.

Preferably, the liquid inflow channel is straight and runs through the distal end and the proximal end of the connector;

The liquid outflow channel runs through the distal end and the proximal end of the connector, and the cross-sectional dimension of the distal end of the liquid outflow channel is larger than the cross-sectional dimension of the proximal end.

Preferably, the liquid outflow channel is cylindrical, and the cross-sectional dimension of the proximal end of the liquid outflow channel is smaller than the cross-sectional dimension of the liquid inflow channel.

Preferably, the connecting pipe is sleeved outside the connecting piece, and the connecting pipe includes a liquid inlet lumen, a liquid outlet lumen and a wire lumen;

The liquid inlet lumen is connected with the liquid inflow channel; the liquid outlet lumen is connected with the liquid outflow channel, and the line lumen is connected with the line channel.

Preferably, the liquid outflow channel is annular, and surrounds the liquid inflow channel from the inside of the liquid inflow channel;

The distal end of the annular liquid outflow channel is provided with an inclined surface, and the inclined surface forms an outward radial opening at the entrance of the distal end of the liquid outflow channel, so that the cross-sectional dimension of the distal end of the liquid outflow channel is larger than that of the proximal end.

Preferably, the connecting pipe is hollow inside and is sleeved outside the connecting piece;

The connecting pipe is provided with a liquid inlet pipe, a liquid outlet pipe and a line pipe, the liquid outlet pipe is sleeved outside the liquid inlet pipe, the liquid inlet pipe is connected with the liquid inflow channel, the liquid outlet pipe is connected with the liquid outflow channel, and the line pipe is connected with the line channel .

Preferably, a perfusion channel connected to the liquid inflow channel and/or the liquid outflow channel is provided in the connector;

The plane where the perfusion channel is located is perpendicular to the axis of the liquid inflow channel; and the perfusion channel is annular;

The side of the connector is provided with a perfusion hole, and the perfusion hole is connected to the perfusion channel and penetrates through the side of the connector.

Preferably, the end of the connecting pipe is provided with a liquid outflow valve, and the liquid outflow valve is connected to the liquid outflow channel through the liquid outlet pipe;

A flow switch is provided on the liquid outflow valve, and the flow switch can adjust the liquid flow rate of the liquid outlet pipe.

The beneficial effect of the present invention is to provide a radio frequency ablation catheter with a cooling bladder. When the radio frequency electrode is working, the cooling bladder is injected with circulating cooling liquid to expand, closely fit the inside of the electrode, and cool the electrode; The four-quadrant electrode is shaped like a four-quadrant. After the cooling capsule is filled with water, it can adapt to the helical shape to expand inside the catheter end, and it closely fits the inside of the electrode to cool down each electrode, control the heat energy released by the electrode itself in the working state, and reduce the damage to the blood vessel. damage.

On the other hand, the RF electrode can selectively increase the coolant pressure by adjusting the flow switch during operation, so that the coolant is ejected from the perfusion hole, and the physiological saline flows into the blood, which has a cooling effect; then the flow switch can be adjusted to reduce the pressure. The low coolant pressure stops the perfusion of saline into the blood.

Description of drawings

1 is a schematic structural diagram of a radiofrequency ablation catheter with a cooling bladder according to an embodiment of the present invention;

2 is a schematic structural diagram of a catheter tip and a connector according to an embodiment of the present invention;

3 is a cross-sectional view of a catheter tip and a connector according to an embodiment of the present invention;

4 is a schematic diagram of a connecting part of a connector and a connecting pipe with a cavity according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a connecting part of a connecting piece and a hollow connecting pipe according to an embodiment of the present invention;

6 is a cross-sectional view of a connector according to an embodiment of the present invention;

7 is a cross-sectional view of a connector and an extension tube according to an embodiment of the present invention;

8 is a schematic diagram of a helical conduit according to an embodiment of the present invention;

9 is a cross-sectional view of a spiral conduit and a schematic structural diagram of an internal cooling bladder according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a perfusion microporous structure according to an embodiment of the present invention.

Detailed ways

The method of the present invention will be described in further detail below with reference to the accompanying drawings and the embodiments of the present invention.

Example 1

Referring to FIG. 1 and FIG. 2 , an embodiment of the present invention provides a radiofrequency ablation catheter 1 with a cooling bladder 112, including a catheter end 11 and a connecting tube 12 connected in sequence;

The catheter tip 11 includes: an outer tube portion 111 provided with a hollow cavity, a cooling bladder 112 provided in the hollow cavity, and a connector 13 for fixing the outer tube portion 111 and the cooling bladder 112;

One end of the cooling bladder 112 is open and elastic; the connecting member 13 includes a proximal end and a distal end, the outer tube portion 111 and the cooling bladder 112 are connected to the distal end, and the proximal end is used for butt joint with the connecting tube 12; the connecting tube 12 is provided with a Liquid inlet pipe 121, liquid outlet pipe 122 and line pipe 123;

The connector 13 is provided with a liquid inflow channel 131, a liquid outflow channel 132 and a line channel 133;

Radiofrequency ablation is to send the electrode 2 catheter into a specific part through the vein or arterial blood vessel, and release the radiofrequency current to destroy the tissue, so as to achieve the purpose of treating the disease.

For example, renal sympathetic denervation can effectively reduce the sympathetic activity of the whole body and local kidney, and has a good therapeutic effect on refractory hypertension. .

For another example, cardiac radiofrequency ablation is to send the electrode 2 catheter into a specific part of the cardiac cavity through a vein or an artery, and release radiofrequency current to cause coagulation necrosis of the local endocardium and subendocardial myocardium to block abnormal conduction of tachyarrhythmias. Interventional techniques for beams and origins.

However, in the process of ablating the nerves outside the blood vessel through the catheter guide electrode 2 in the blood vessel, the released heat energy from the electrode 2 may not be targeted, and the released heat energy will cause irreversible damage to the blood vessel. Anticoagulants are required for life; in severe cases, blood vessels can close, causing more serious damage.

The catheter tip 11 of this embodiment is used to install the electrode 2. Specifically, the electrode 2 is embedded and installed on the outside of the outer tube portion 111. The inside of the electrode 2 protrudes from the inner surface of the outer tube portion 111. The hollow cavity of the outer tube portion 111 is provided with a The cooling bag 112 has an opening at one end, and the opening is fixed at the distal end of the connecting piece 13 .

The connector 13 is provided with a liquid inflow channel 131 and a liquid outflow channel 132 .

During use, the catheter tip 11 is delivered to the location where ablation needs to be performed through the blood vessel, and the cooling liquid is delivered into the cooling balloon 112 through the liquid inflow channel 131 and flows out from the liquid outflow channel 132 for circulation.

The cooling bag 112 is expanded under the pressure of the liquid, and the cooling bag 112 has airtightness, and the cooling liquid will not leak out and directly contact the electrode 2 . The expanded cooling bladder 112 closely fits the inside of the outer tube portion 111 , and can also fit the inside of the electrode 2 to cool down each electrode 2 , control the heat energy released by the electrode 2 itself in the working state, and reduce the damage to the blood vessel. .

Compared with the traditional electrode 2 with cooling function, the cooling liquid circulates in the pipeline, and can indirectly contact the electrode 2 through the pipe wall. The electrode 2 generates a large amount of heat instantly, and the indirect contact cooling method cannot achieve better cooling. Effect.

The cooling bladder 112 in this embodiment has thin walls and has plasticity, and the pressure of the cooling liquid can make the cooling bladder 112 expand and closely adhere to the electrode 2 to cool the electrode 2 . The contact area is large and the cooling speed is fast.

In the specific implementation process, as shown in FIG. 1 , the ablation catheter 1 includes an electrode 2 , a connecting tube 12 and an operating handle 9 arranged on the head catheter end 11 . The ablation catheter 1 enters the blood vessel percutaneously and can be guided by a guide wire , travel to the position where ablation needs to be performed in the blood vessel, and then start the electrode 2 for ablation. In this embodiment, the electrode wire, the liquid inlet tube 121 and the liquid outlet tube 122 are all connected to the operating handle 9 through the connecting tube 12. The operating handle 9 An electrode 2 interface capable of being connected to the electrode 2 controller, a cooling liquid water inlet and a cooling liquid water outlet connected to the circulating pump are provided. The above-mentioned electrode 2 interface, the cooling liquid inlet and the cooling liquid outlet are not shown in the figure.

Further, one or more ablation electrodes 2 are provided on the outside of the outer tube portion 111, and each ablation electrode 2 is connected with an electrode wire respectively;

The electrode wire extends toward the connecting member 13 along the inner surface of the hollow cavity, and enters the wire tube 123 through the wire channel 133 through the connecting member 13 .

In this embodiment, for the above-mentioned renal sympathetic nerve removal, the renal sympathetic nerves are distributed around the blood vessels. Therefore, the catheter is designed in a spiral shape, and one or more electrodes 2 are respectively arranged in the four quadrants to ablate the nerves around the blood vessel simultaneously or select a certain direction for ablation.

The helical catheter is closer to the blood vessel wall than the straight catheter. In order to prevent the heat generated by the electrode 2 from damaging the blood vessel, it is necessary to quickly cool the electrode 2. The traditional method of circulating cooling water in the pipeline to cool down may cause The heat generated by the electrode 2 damages the blood vessels.

As shown in FIG. 8 and FIG. 9 , FIG. 8 shows a spiral outer tube part 111a according to another embodiment of the present invention. The spiral outer tube part 111a includes four electrodes 2 , and the four electrodes 2 are respectively directed to four parts of the space. direction, that is, the four-quadrant direction.

In the specific implementation process, the target nerve cannot be identified in the nerve-dense area, and the four-quadrant electrode 2 can be controlled to release weak energy to stimulate the nerve and detect the physiological index parameters, and find the target nerve-intensive area to release stronger energy to the target nerve. ablation.

It can be seen that the helical outer tube portion 111a and the four-quadrant electrode 2 can be arranged in multiple directions and controlled respectively, so that the radiofrequency ablation is directional, and ablation is only performed on areas with dense target nerves.

However, the helical outer tube portion 111a is closer to the blood vessel wall than the straight tube. In order to prevent the heat generated by the electrode 2 from damaging the blood vessel, the electrode 2 needs to be cooled quickly. As shown in FIG. The thin and ductile cooling bladder 112 can be arranged in the helical outer tube portion 111a. After the cooling liquid is introduced, it is expanded by the liquid pressure, and closely fits the inside of the electrode 2 to cool down each electrode 2 and control the operation of the electrode 2. The heat energy released by itself in the state reduces the damage to the blood vessels.

In the specific implementation process, the electrode wire is connected to the electrode 2 to supply power to the electrode 2 and control the opening and closing of the electrode 2. The electrode wire of the ablation catheter 1 in this embodiment is arranged along the inner surface of the hollow cavity of the outer tube portion 111 and passes through the wire channel. 133 passes through the connector 13, and is then connected to the controller outside the body through the conduit 123.

Further, as shown in FIG. 7 , the distal end of the connector 13 is provided with an extension tube 3 , the extension tube 3 is connected with the liquid inlet tube 121 , and the length of the extension tube 3 is less than the length of the hollow cavity.

In this embodiment, the extension pipe 3 is used to transport the cooling liquid to the distal end of the cooling bag 112 , the low-temperature cooling liquid passes through all the electrodes 2 and exchanges heat with the electrodes 2 , and the heated cooling liquid flows to the connecting piece 13 in the cooling bag 112 . It flows through the liquid outflow channel 132 and then flows into the extracorporeal circulation device through the liquid outlet pipe 122, or it can enter the liquid inlet pipe 121 to form circulating cooling after re-cooling.

For the above-mentioned helical outer pipe portion 111a, a helical or curved extension pipe 3 that can be adapted to the helical curve can be provided to deliver the cooling liquid to the distal end of the cooling bladder 112 .

Further, the liquid inflow channel 131 is straight cylindrical, and runs through the distal end and the proximal end of the connecting piece 13;

The liquid outflow channel 132 runs through the distal end and the proximal end of the connector 13, and the cross-sectional dimension of the distal end of the liquid outflow channel 132 is larger than that of the proximal end.

In this embodiment, the cross-sectional dimension of the distal end of the liquid outflow channel 132 is larger than that of the proximal end, so that the cooling bladder 112 is in an unexpanded state in a natural state, and the cross-sectional dimension of the liquid inflow channel 131 is large, so that liquid inflow and liquid outflow occur. Pressure difference.

The pressure difference can make the cooling bladder 112 expand, closely fit the inside of the electrode 2, and cool the electrode 2; especially for the four-quadrant electrode 2 in the shape of a spiral, the cooling bladder 112 can adapt to the spiral shape after water injection inside the catheter tip 11 It expands, and closely adheres to the inside of the electrode 2, cooling each electrode 2, and controlling the heat energy released by the electrode 2 in the working state to reduce the damage to the blood vessel.

Further, the liquid outflow channel 132 is cylindrical, and the cross-sectional dimension of the proximal end of the liquid outflow channel 132 is smaller than the cross-sectional dimension of the liquid inflow channel 131 .

FIG. 3 shows an arrangement of the liquid inflow channel 131 and the liquid outflow channel 132 . Specifically, as shown in FIG. 3 , the distal end of the connecting piece 13 is used to butt the cooling bladder 112 , and the distal end of the connecting piece 13 is provided with an annular fixed Plate 4 for tightening the opening of the cooling bladder 112 .

The proximal end of the connecting piece 13 is used to butt the connecting pipe 12, and the liquid inflow channel 131 and the liquid outflow channel 132 are arranged in parallel at the proximal end of the connecting piece 13, respectively butting the two cavities of the connecting pipe 12, respectively for the cooling liquid inflow and the liquid outflow channel 132. outflow.

The liquid inflow channel 131 and the liquid outflow channel 132 are two concentric pipes at the distal end. The liquid inflow pipe injects the cooling liquid into the cooling bag 112 through the central pipe; the liquid outflow pipe outputs the cooling liquid through the outer pipe.

Further, the connecting pipe 12 is sleeved outside the connecting piece 13, and the connecting pipe 12 includes a cavity of the liquid inlet pipe 121, the cavity of the liquid outlet pipe 122 and the cavity of the line pipe 123;

The cavity of the liquid inlet pipe 121 is connected with the liquid inflow channel 131 ; the cavity of the liquid outlet pipe 122 is connected with the liquid outflow channel 132 , and the cavity of the line pipe 123 is connected with the line channel 133 .

As shown in FIG. 4 , the connecting tube 12 of this embodiment is solid, and is provided with a cavity for a liquid inlet tube 121 , a cavity for the liquid outlet tube 122 , and a cavity for the line tube 123 .

The inflowing cooling liquid and the outflowing cooling liquid directly connect the handle and the catheter end 11 through the cavity inside the connecting pipe 12 .

Further, the liquid outflow channel 132 is annular, and surrounds the liquid inflow channel 131 from the inside of the liquid inflow channel 131;

The distal end of the annular liquid outflow channel 132 is provided with an inclined surface 5, and the inclined surface 5 forms an outward radial opening at the entrance of the distal end of the liquid outflow channel 132, so that the cross-sectional dimension of the distal end of the liquid outflow channel 132 is larger than that of the proximal end. .

As shown in FIG. 3 , the liquid inflow channel 131 and the liquid outflow channel 132 are two concentric pipes at the distal end, and the liquid outflow channel is provided with a slope 5 and has a trumpet-shaped opening, so that the cross-sectional size of the distal end of the liquid outflow channel 132 is larger than that of the near-end liquid outflow channel 132. The cross-sectional size of the end can ensure that the outflowing cooling liquid can be introduced into the liquid outflow channel 132, and the cross-sectional dimension of the liquid outflow channel 132 can be reduced, resulting in a pressure difference.

Further, the connecting pipe 12 is hollow inside, and is sleeved outside the connecting piece 13;

The connecting pipe 12 is provided with a liquid inlet pipe 121, a liquid outlet pipe 122, and a line pipe 123. The liquid outlet pipe 122 is sleeved outside the liquid inlet pipe 121. The liquid inlet pipe 121 is connected with the liquid inflow channel 131, and the liquid outlet pipe 122 is connected with the liquid. The outflow channel 132 is connected, and the line tube 123 is connected with the line channel 133 .

5 and 6 show another arrangement of the liquid inflow channel 131 and the liquid outflow channel 132. Specifically, as shown in FIG. 6, the liquid inflow channel 131 and the liquid outflow channel 132 are concentric at the distal end and the proximal end. The liquid inflow pipe in the center is supported by the support 6 on the side and the inner wall of the liquid outflow channel 132 .

As shown in FIG. 5 , another connecting pipe 12 is hollow inside. The liquid inlet pipe 121 , the liquid outlet pipe 122 and the line pipe 123 arranged in the connecting pipe 12 are all independent pipes. The liquid inlet pipe 121 is sleeved on the liquid outlet. Tube 122 is external.

The connecting tube 12 in this embodiment is hollow inside, which reduces the influence of the circulating cooling liquid on the temperature of the blood vessel. Further, the liquid inlet pipe 121 and the liquid outlet pipe 122 being sleeved with each other can also reduce the influence of the blood temperature on the cooling liquid temperature.

Further, a perfusion channel 8 connected to the liquid inflow channel 131 and/or the liquid outflow channel 132 is provided in the connector 13;

The plane where the perfusion channel 8 is located is perpendicular to the axis of the liquid inflow channel 131; and the perfusion channel 8 is annular;

A perfusion hole 81 is provided on the side of the connecting piece 13 , and the perfusion hole 81 is connected to the perfusion channel 8 and penetrates the side of the connecting piece 13 .

The end of the connecting pipe 12 is provided with a liquid outflow valve, and the liquid outflow valve is connected with the liquid outflow channel 132 through the liquid outlet pipe 122;

A flow switch 7 is provided on the liquid outflow valve, and the flow switch 7 can adjust the liquid flow rate of the liquid outlet pipe 122 .

The end of the connecting pipe 12 is provided with a liquid outflow valve, and the liquid outflow valve is connected with the liquid outflow channel 132 through the liquid outlet pipe 122;

A flow switch 7 is provided on the liquid outflow valve, and the flow switch 7 can adjust the liquid flow rate of the liquid outlet pipe 122 .

As shown in FIG. 10 , the perfusion channel 8 can be connected to the liquid inflow channel 131 and also can be connected to the liquid outflow channel 132 . In this embodiment, the perfusion channel 8 is connected to the liquid outflow channel 132 .

The filling hole 81 surrounds the outer side of the connector 13, and the cooling liquid enters the filling hole 81 through the liquid outflow channel 132. When the cooling cycle is smooth, due to the small diameter of the filling hole 81, the cooling liquid will not flow out from the filling hole 81, or can only flow out. A small amount of coolant.

The cooling liquid in this embodiment may be physiological saline that has been cooled down.

The radio frequency electrode 2 can selectively increase the cooling liquid pressure by adjusting the flow switch 7 during operation, so that the cooling liquid is ejected from the perfusion hole 81, and the physiological saline flows into the blood, which has a cooling effect; after that, the flow switch 7 can be adjusted to reduce the pressure. The low coolant pressure stops the perfusion of saline into the blood.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "straight", "horizontal", " The orientation or positional relationship indicated by center, top, bottom, top, bottom, inner, outer, inner, outer, etc. is based on the orientation shown in the drawings or The positional relationship is only for the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected" and "assembled" should be understood in a broad sense, for example, it may be fixed The connection can also be a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

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

Claims (10)

1. A radiofrequency ablation catheter with a cooling bladder, characterized in that it comprises a catheter end and a connecting pipe connected in sequence; The catheter tip includes: an outer tube part provided with a hollow cavity, a cooling bladder set in the hollow cavity, and a connecting piece for fixing the outer tube part and the cooling bladder; One end of the cooling bladder is open and elastic; the connecting piece includes a proximal end and a distal end, the outer tube part and the cooling bladder are connected to the distal end, and the proximal end is used for docking with the connecting pipe; the connecting pipe is provided with a liquid inlet pipe and a liquid outlet pipe and conduit; The connecting piece is provided with a liquid inflow channel, a liquid outflow channel and a line channel; the liquid inflow channel, the liquid outflow channel and the line channel are respectively connected with the liquid inlet pipe, the liquid outlet pipe and the line pipe. 2 . The radiofrequency ablation catheter with a cooling bladder according to claim 1 , wherein one or more ablation electrodes are provided on the outside of the outer tube portion, and each ablation electrode is respectively connected with an electrode wire; 3 . The electrode wire extends toward the connecting piece along the inner surface of the hollow cavity, and enters the wire tube through the wire channel through the connecting piece. 3 . The radiofrequency ablation catheter with a cooling bladder according to claim 2 , wherein an extension tube is provided at the distal end of the connector, the extension tube is connected with the liquid inlet tube, and the length of the extension tube is smaller than the hollow cavity. 4 . length. 4 . The radiofrequency ablation catheter with a cooling bladder according to claim 2 , wherein the liquid inflow channel is straight cylindrical and runs through the distal end and the proximal end of the connector; 5 . The liquid outflow channel runs through the distal end and the proximal end of the connector, and the cross-sectional dimension of the distal end of the liquid outflow channel is larger than the cross-sectional dimension of the proximal end. 5 . The radiofrequency ablation catheter with a cooling bladder according to claim 4 , wherein the liquid outflow channel is cylindrical, and the proximal cross-sectional dimension of the liquid outflow channel is smaller than the cross-sectional dimension of the liquid inflow channel. 6 . 6 . The radiofrequency ablation catheter with a cooling bladder according to claim 5 , wherein the connecting tube is sleeved outside the connector, and the connecting tube includes a liquid inlet lumen, a liquid outlet lumen and a wire lumen. 7 . ; The liquid inlet lumen is connected with the liquid inflow channel; the liquid outlet lumen is connected with the liquid outflow channel, and the line lumen is connected with the line channel. 7 . The radiofrequency ablation catheter with a cooling bladder according to claim 4 , wherein the liquid outflow channel is annular, and surrounds the liquid inflow channel from the inside of the liquid inflow channel; 8 . The distal end of the annular liquid outflow channel is provided with an inclined surface, and the inclined surface forms an outward radial opening at the entrance of the distal end of the liquid outflow channel, so that the cross-sectional dimension of the distal end of the liquid outflow channel is larger than that of the proximal end. 8 . The radiofrequency ablation catheter with a cooling bladder according to claim 7 , wherein the connecting tube is hollow inside and is sleeved outside the connecting piece; 9 . The connecting pipe is provided with a liquid inlet pipe, a liquid outlet pipe and a line pipe, the liquid outlet pipe is sleeved outside the liquid inlet pipe, the liquid inlet pipe is connected with the liquid inflow channel, the liquid outlet pipe is connected with the liquid outflow channel, and the line pipe is connected with the line channel . 9 . The radiofrequency ablation catheter with a cooling bladder according to claim 5 or 7 , wherein an irrigation channel connected to a liquid inflow channel and/or a liquid outflow channel is arranged in the connector; 10 . The plane where the perfusion channel is located is perpendicular to the axis of the liquid inflow channel; and the perfusion channel is annular; The side of the connector is provided with a perfusion hole, and the perfusion hole is connected to the perfusion channel and penetrates through the side of the connector. 10 . The radiofrequency ablation catheter with a cooling bladder according to claim 9 , wherein a liquid outflow valve is provided at the end of the connecting pipe, and the liquid outflow valve is connected to the liquid outflow channel through the liquid outlet pipe; 10 . A flow switch is provided on the liquid outflow valve, and the flow switch can adjust the liquid flow rate of the liquid outlet pipe.

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