Water-cooled catheter for varicosity ablation

Abstract

The utility model relates to the technical field of microwave ablation, in particular to a water-cooled catheter for varicosity ablation, which comprises a needle head, a polytetrafluoroethylene (PTFE) cannula, a multi-cavity catheter, joints, a leading-in joint and a leading-out joint, the PTFE cannula is fixedly connected between the needle head and the multi-cavity catheter, the multi-cavity catheter is connected with the leading-in joint and the leading-out joint through the joints, a coaxial cable cavity, two water cooling cavities and a guide wire cavity are formed in the multi-cavity catheter, cooling liquid continuously penetrates through the catheter by means of rotation of a peristaltic pump in the microwave ablation instrument, redundant heat emitted by microwaves at the front end of the catheter is absorbed, normal heating of the front end of the catheter for treatment is guaranteed, and the service life of the catheter is prolonged. The catheter has the advantages that the catheter body is provided with the guide wire cavity, redundant heat can be absorbed away, heat of the catheter body is reduced, safety of medical staff and patients is guaranteed, the guide wire with sufficient toughness is arranged in the guide wire cavity, strength and toughness of the catheter are guaranteed, and the catheter is smoother and more convenient to place in the placing process.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave ablation, in particular to a water-cooled catheter used for varicose vein ablation. Background Art

[0002] Varicose veins are a common circulatory disease that usually occurs in the lower limbs. It is caused by blood backflow in the blood vessels and damage to the blood vessel walls. Varicose veins may cause leg swelling, pain, itching and fatigue, and in severe cases may even cause ulcers. For severe varicose veins, the more advanced diagnosis and treatment method in the hospital is microwave ablation, which uses microwave energy to close or destroy abnormally dilated veins to restore normal blood circulation. In this process, the doctor will use a catheter to introduce a microwave probe into the patient's vein. Once the catheter reaches the target location, microwave energy is released into the tissue around the vein wall, causing the vein to contract and close, which can prevent blood from flowing back in the varicose veins, relieve symptoms and improve blood circulation. Compared with traditional open surgical treatment, microwave ablation has many advantages, including less trauma, faster postoperative recovery, and lower pain and complication risks.

[0003] However, there are some problems in the clinical use of microwave ablation: 1. The heat of the ablation catheter will be transmitted from the head end to the tail end, causing the temperature of the entire catheter to be relatively hot, which does not meet the ideal requirement of only heating the head end while keeping the rest of the catheter cool; 2. Since the catheter needs to puncture deep into the vein, the catheter needs to have strong strength and toughness, but since the diameter of the catheter is only about 2 mm, it is difficult for a general catheter to achieve this function. For this reason, the utility model provides a water-cooled catheter for varicose vein ablation to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a water-cooled catheter for varicose vein ablation, which solves the technical problem that the heat of the ablation catheter during microwave ablation is conducted from the head end to the tail end, causing the temperature of the entire catheter to be relatively hot, and failing to achieve the ideal requirement of only heating the head end while keeping the rest of the catheter cool. Furthermore, since the catheter needs to be inserted deep into the vein, the catheter needs to have greater strength and toughness. However, since the diameter of the catheter is only about 2 mm, it is difficult for a general catheter to achieve this function.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A water-cooled catheter for varicose vein ablation, comprising a needle, a PTFE sleeve, a multi-lumen catheter, a joint, an introduction joint and a discharge joint, wherein the PTFE sleeve is fixedly connected between the needle and the multi-lumen catheter, and the multi-lumen catheter is connected with the introduction joint and the discharge joint through the joint, wherein the multi-lumen catheter is provided with a coaxial cable cavity, a water-cooling cavity and a guide wire cavity, the number of the water-cooling cavities is 2, the number of the guide wire cavities includes but is not limited to 3, and the guide wire cavities are all equipped with metal guide wires.

[0007] Beneficial effects: The water-cooled catheter used for varicose vein ablation relies on the rotation of the peristaltic pump in the microwave ablation instrument to continuously pass cooling liquid through the catheter, absorbing excess heat emitted by the microwaves at the front end of the catheter, which not only ensures normal heating of the front end of the catheter for treatment, but also absorbs excess heat to reduce the heat of the tube body and ensure the safety of medical staff and patients. A sufficiently tough guidewire is built into the guidewire cavity, which ensures the strength and toughness of the catheter, making the catheter smoother and more convenient during insertion.

[0008] Furthermore, the guidewire lumens are equidistantly arranged around the center of the multi-lumen catheter.

[0009] Furthermore, the two water-cooling chambers are divided into a water inlet chamber and a water outlet chamber, and the ends of the water inlet chamber and the water outlet chamber are connected to each other, and the inlet joint and the outlet joint are respectively connected to the head ends of the water inlet chamber and the water outlet chamber.

[0010] Furthermore, the outer diameter of the multi-lumen catheter is not greater than 2 mm, and the length of the multi-lumen catheter is not greater than 1 m.

[0011] Furthermore, a coaxial cable is built into the coaxial cable cavity, and the end of the coaxial cable passes through a PTFE sleeve and is connected to a needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of a water-cooled catheter for varicose vein ablation according to the utility model;

[0013] Figure 2 The utility model is a cross-sectional view of a multi-lumen catheter in a water-cooled catheter used for varicose vein ablation.

[0014] Figure numerals: 1. needle; 2. PTFE sleeve; 3. multi-lumen catheter; 31. coaxial cable cavity; 32. water-cooling cavity; 33. guide wire cavity; 4. connecting seat; 5. import connector; 6. export connector. DETAILED DESCRIPTION

[0015] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. At the same time, it should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

[0016] See Figure 1 to Figure 2 As shown, a water-cooled catheter for varicose vein ablation comprises a needle 1, a PTFE sleeve 2, a multi-lumen catheter 3, a connecting seat 4, an inlet connector 5 and an outlet connector 6, wherein the PTFE sleeve 2 is fixedly connected between the needle 1 and the multi-lumen catheter 3, the coaxial cable cavity 31 has a coaxial cable built therein, and the end of the coaxial cable passes through the PTFE sleeve 2 and is connected to the needle 1;

[0017] Specifically, one end of the coaxial cable cavity 31 is connected to the microwave generator, and the other end is connected to the needle 1, so that the needle 1 is heated. The PTFE sleeve 2 serves to isolate the needle 1 from the multi-lumen catheter 3, so that the heat of the isolated needle 1 is not easily transferred to the multi-lumen catheter 3.

[0018] Furthermore, the multi-lumen catheter 3 is provided with a coaxial cable cavity 31, a water cooling cavity 32 and a guide wire cavity 33, the outer diameter of the multi-lumen catheter 3 is not greater than 2 mm, and the length of the multi-lumen catheter 3 is not greater than 1 m;

[0019] Specifically, the multi-lumen catheter 3 needs to be inserted into a vein at a depth of 1 m, so it is necessary to ensure that the catheter has sufficient support so as not to bend during the insertion process.

[0020] Furthermore, the number of the water-cooling chambers 32 is 2, and the multi-cavity catheter 3 is connected to an inlet joint 5 and an outlet joint 6 through a connecting seat 4. The two water-cooling chambers 32 are divided into a water inlet chamber and a water outlet chamber, and the ends of the water inlet chamber and the water outlet chamber are connected to each other, and the inlet joint 5 and the outlet joint 6 are connected to the head ends of the water inlet chamber and the water outlet chamber respectively;

[0021] Specifically, the inlet connector 5 is connected to the output end of the peristaltic pump through a hose, and the input end of the peristaltic pump is connected to the cooling pool. The operation of the peristaltic pump can draw the coolant in the cooling pool and force it through the water inlet chamber and the water outlet chamber. After the coolant exchanges heat with the multi-lumen catheter 3, it flows back to the cooling pool from the outlet connector 6 and the external hose and can be recycled. It is worth mentioning that the cooling pool is equipped with a refrigeration device to realize the circulating refrigeration of the coolant, which can effectively improve the utilization rate of the coolant and ensure the heat exchange effect.

[0022] Furthermore, the number of the guidewire cavities 33 includes but is not limited to 3, and each of the guidewire cavities 33 has a metal guidewire built in it, and the guidewire cavities 33 are equidistantly arranged around the center of the multi-lumen catheter 3;

[0023] Specifically, the guidewire cavity 33 is distributed at the edge of the multi-cavity catheter 3, and can provide sufficient support for the internal water-cooling cavity 32 to prevent the multi-cavity catheter 3 from excessively bending and blocking the cooling liquid or affecting the introduction effect.

[0024] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A water-cooled catheter for varicose vein ablation, characterized in that: The invention comprises a needle (1), a PTFE sleeve (2), a multi-lumen catheter (3), a connecting seat (4), an inlet connector (5) and an outlet connector (6), wherein the PTFE sleeve (2) is fixedly connected between the needle (1) and the multi-lumen catheter (3), and the multi-lumen catheter (3) is connected to the inlet connector (5) and the outlet connector (6) via the connecting seat (4), wherein the multi-lumen catheter (3) is provided with a coaxial cable cavity (31), a water-cooling cavity (32) and a guide wire cavity (33), wherein the number of the water-cooling cavities (32) is 2, the number of the guide wire cavities (33) includes but is not limited to 3, and each of the guide wire cavities (33) is provided with a metal guide wire.

2. A water-cooled catheter for varicose vein ablation according to claim 1, characterized in that: The guidewire lumens (33) are arranged equidistantly around the center of the multi-lumen catheter (3).

3. The water-cooled catheter for varicose vein ablation according to claim 1, characterized in that: The two water cooling chambers (32) are divided into a water inlet chamber and a water outlet chamber, and the ends of the water inlet chamber and the water outlet chamber are connected to each other, and the inlet joint (5) and the outlet joint (6) are connected to the head ends of the water inlet chamber and the water outlet chamber respectively.

4. The water-cooled catheter for varicose vein ablation according to claim 1, characterized in that: The outer diameter of the multi-lumen catheter (3) is not greater than 2 mm, and the length of the multi-lumen catheter (3) is not greater than 1 m.

5. The water-cooled catheter for varicose vein ablation according to claim 1, characterized in that: The coaxial cable cavity (31) contains a coaxial cable, and the end of the coaxial cable passes through the PTFE sleeve (2) and is connected to the needle (1).

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