An ablation needle temperature regulation device

Abstract

The present application relates to a kind of ablation needle temperature regulating device, the water-cooled circulating catheter of varicose ablation is composed of needle, connecting sleeve, coaxial cable, water stop sleeve, cooling capillary, middle sleeve and outer sleeve;Invention will be cooled into the water passage of middle sleeve composition water, then through water inlet hole sequentially into the cavity of cooling capillary, then from drain hole into the water outlet passage of outer sleeve composition, then discharge, complete cooling, by setting baffle, the cooling water that is not heated evenly distributes in each part of the present water-cooled circulating catheter of varicose ablation, ensure cooling effect;Adjusting spring made of temperature adjustment memory metal material is stretched and contracted, and then the size of drain hole is adjusted, the cooling water drainage rate of different temperature parts is adjusted, accurate cooling is achieved, cooling effect is improved, and the temperature of cooling water is higher and higher as cooling proceeds, the cooling effect of needle is ensured.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to an ablation needle temperature regulation device. Background Technology

[0002] In clinical practice, varicose vein ablation catheters are mainly used in conjunction with microwave ablation systems to achieve ablation treatment of varicose veins in the lower extremities. The working principle is that the microwave ablation system generates microwave energy, which is emitted through the varicose vein ablation catheter and acts on the blood vessel wall. The microwave energy is converted into heat energy by the rapid rotation and mutual friction of water molecules in the tissue, which coagulates the blood vessel wall until the blood vessel closes and eventually leads to fibrosis. During the treatment, a swelling fluid is injected under ultrasound guidance to ensure that the blood vessel is completely wrapped and tightly attached to the ablation catheter. The microwave closure process is monitored in real time. High-brightness ultrasound imaging can be seen during microwave ablation closure, thus achieving the therapeutic effect of complete closure.

[0003] Existing varicose vein ablation catheters generally suffer from high rod temperatures during prolonged operation. Since the ablation procedure involves removal of the needle, the high rod temperature poses a risk of damaging normal patient tissue and burning the operator. Therefore, there is an urgent need for an ablation catheter that can effectively reduce rod temperature. Chinese patent application number 202211597609.2 discloses an ultra-flexible cold-circulation varicose vein ablation catheter. The cold-circulation structure of the ablation catheter can effectively reduce rod temperature, effectively protecting the patient's normal body tissue and the operator's safety without affecting the product's heating efficiency. However, the cooling water absorbs heat and its temperature rises during the cooling process. This results in a decrease in cooling effect as the water circulation approaches the tip of the ablation needle, leading to excessively high needle temperature. This can cause carbonization of the tissue near the needle tip after ablation, and may even lead to needle tip rupture and medical accidents.

[0004] Further improvements are needed to address the shortcomings of existing technologies. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an ablation needle temperature adjustment device to solve the above problems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The water-cooled circulation catheter for varicose vein ablation of the present invention consists of a needle, a connecting sleeve, a coaxial cable, a water-blocking sleeve, a cooling capillary, a middle sleeve, and an outer sleeve. A connecting sleeve is provided between the tail of the needle and the lower end of the outer sleeve. The upper end of the connecting sleeve is bonded to the lower end of the outer sleeve. The coaxial cable is built into the outer sleeve, and the lower end of the coaxial cable is fixedly connected to the needle. The middle sleeve and the cooling capillary are coaxially arranged inside the outer sleeve. The inner wall of the cooling capillary is in contact with the coaxial cable, and the middle sleeve is arranged between the cooling capillary and the outer sleeve. The lower ends of both the cooling capillary and the middle sleeve are fixedly connected to the water-blocking sleeve. The upper end of the middle sleeve is connected to the cooling water inlet of the varicose vein ablation catheter to form a water inlet channel, and the upper end of the outer sleeve is connected to the cooling water outlet of the varicose vein ablation catheter to form a water outlet channel.

[0007] The cooling capillary has multiple partitions evenly distributed inside, which divide the cooling capillary into multiple cavities. A water inlet is provided near the upper end of the cavity of the cooling capillary, and the water inlet is connected to the middle sleeve. A drain hole is provided near the lower end of the cavity of the cooling capillary, and the drain hole is connected to the outer sleeve.

[0008] Preferably, the lower end of the connecting sleeve is bonded or welded to the tail of the needle.

[0009] Preferably, the water-blocking sleeve is fitted onto the coaxial cable near the tail of the needle to prevent cooling water from entering the tip of the varicose vein ablation catheter.

[0010] Preferably, the cooling capillary is made of ultra-thin-walled, high-temperature resistant PI tube.

[0011] Preferably, the inner sleeve and outer sleeve are made of PE EK or PE BAX material.

[0012] Preferably, the cavity of the cooling capillary is provided with an adjusting spring and a plug. The plug is arc-shaped and closely attached to the inner wall near the drain hole. The upper part of the plug is fixedly connected to the lower end of the adjusting spring, and the upper end of the adjusting spring is fixedly connected to the upper part of the cavity of the cooling capillary.

[0013] Preferably, the height of the plug is less than the height of the drain hole to avoid the plug completely blocking the drain hole.

[0014] Preferably, the adjusting spring is made of shape memory metal material, and the adjusting spring elongates in the room temperature phase of the shape memory metal and contracts in the high temperature phase. The contraction of the adjusting spring is used to adjust the up and down sliding of the plug, thereby adjusting the size of the drain hole and controlling the cavity drainage rate of the cooling capillary.

[0015] The beneficial effects of this invention are as follows: Cooling water is introduced into the inlet channel formed by the middle sleeve, then sequentially enters the cavity of the cooling capillary through the inlet hole, and finally exits through the outlet channel formed by the outer sleeve via the drain hole, thus completing the cooling process. By setting baffles, the uncooled and heated cooling water is evenly distributed throughout the water-cooled circulation conduit for varicose vein ablation, ensuring the cooling effect. The adjustment spring, made of temperature-regulating memory metal, extends and retracts to adjust the size of the drain hole, thereby adjusting the cooling water drainage rate at different temperature points, achieving precise cooling, improving the cooling effect, and preventing the cooling water temperature from increasing closer to the needle as cooling progresses, thus ensuring the needle cooling effect. Attached Figure Description

[0016] Figure 1 This is the main structure of the invention. Figure 1 ;

[0017] Figure 2 For the present invention Figure 1 Enlarged view of part A in the middle:

[0018] Figure 3 For the present invention Figure 2 Cross-sectional view of the middle BB section;

[0019] Figure 4 The main structure of this invention Figure 2 ;

[0020] Figure 5 For the present invention Figure 4 Enlarged view of part C in the middle:

[0021] Figure 6 For the present invention Figure 5 Cross-sectional view of the DD section.

[0022] The following are the labels in the diagram: 1. Needle; 2. Connecting sleeve; 3. Coaxial cable; 4. Water-blocking sleeve; 5. Cooling capillary tube; 501. Partition plate; 502. Water inlet; 503. Drain hole; 6. Middle sleeve; 7. Outer sleeve; 8. Adjusting spring; 9. Plug. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] Example 1: As Figure 1-3As shown, the water-cooled circulation catheter for varicose vein ablation of the present invention consists of a needle 1, a connecting sleeve 2, a coaxial cable 3, a water-blocking sleeve 4, a cooling capillary tube 5, a middle sleeve 6, and an outer sleeve 7. A connecting sleeve 2 is provided between the tail of the needle 1 and the lower end of the outer sleeve 7. The upper end of the connecting sleeve 2 is bonded to the lower end of the outer sleeve 7. The coaxial cable 3 is built into the outer sleeve 7, and the lower end of the coaxial cable 3 is fixedly connected to the needle 1. The middle sleeve 6 and the cooling capillary tube 5 are coaxially arranged inside the outer sleeve 7. The inner wall of the cooling capillary tube 5 is in contact with the coaxial cable 3, and the middle sleeve 6 is arranged between the cooling capillary tube 5 and the outer sleeve 7. The lower ends of both the cooling capillary tube 5 and the middle sleeve 6 are fixedly connected to the water-blocking sleeve 4. The upper end of the middle sleeve 6 is connected to the cooling water inlet of the varicose vein ablation catheter to form a water inlet channel, and the upper end of the outer sleeve 7 is connected to the cooling water outlet of the varicose vein ablation catheter to form a water outlet channel.

[0025] In this embodiment, a plurality of partitions 501 are evenly distributed inside the cooling capillary tube 5, which divide the cooling capillary tube 5 into a plurality of cavities. A water inlet hole 502 is provided near the upper end of the cavity of the cooling capillary tube 5, and the water inlet hole 502 is connected to the middle sleeve 6. A drain hole 503 is provided near the lower end of the cavity of the cooling capillary tube 5, and the drain hole 503 is connected to the outer sleeve 7.

[0026] In this embodiment, the lower end of the connecting sleeve 2 is bonded or welded to the tail of the needle 1.

[0027] In this embodiment, the water-blocking sleeve 4 is fitted onto the coaxial cable 3 near the tail of the needle 1 to prevent cooling water from entering the front end of the varicose vein ablation catheter.

[0028] In this embodiment, the cooling capillary 5 is made of ultra-thin-walled, high-temperature resistant PI tube.

[0029] In this embodiment, the middle sleeve 6 and the outer sleeve 7 are made of PE EK or PE BAX material.

[0030] In this embodiment, the cooling method of the water-cooled circulation conduit for varicose vein ablation of the present invention is as follows: cooling water is introduced into the water inlet channel formed by the middle sleeve 6, and then enters the cavity of the cooling capillary 5 through the water inlet hole 502 to cool the heated part of the water-cooled circulation conduit for varicose vein ablation. Afterwards, it enters the water outlet channel formed by the outer sleeve 7 through the drain hole 503 and is discharged, thus completing the cooling. By setting the partition 501, the uncooled and heated cooling water is evenly distributed in various parts of the water-cooled circulation conduit for varicose vein ablation, ensuring the cooling effect.

[0031] Example 2: Figure 4-5As shown, based on Embodiment 1, an adjusting spring 8 and a plug 9 are provided in the cavity of the cooling capillary tube 5. The plug 9 is arc-shaped and closely attached to the inner wall near the drain hole 503. The upper side of the plug 9 is fixedly connected to the lower end of the adjusting spring 8, and the upper end of the adjusting spring 8 is fixedly connected to the upper part of the cavity of the cooling capillary tube 5.

[0032] In this embodiment, the height of the plug 9 is less than the height of the drain hole 503 to prevent the plug 9 from completely blocking the drain hole 503.

[0033] In this embodiment, the adjusting spring 8 is made of shape memory metal. The adjusting spring 8 elongates at room temperature and contracts at high temperature. The contraction of the adjusting spring 8 is used to adjust the sliding of the plug 9 up and down, thereby adjusting the size of the drain hole 503 and controlling the drainage rate of the cavity of the cooling capillary 5.

[0034] In this embodiment, the cooling adjustment method of the water-cooled circulating catheter for varicose vein ablation of the present invention is as follows: When there is a temperature difference in the catheter part corresponding to the cavity of the cooling capillary 5 at different locations, the adjusting spring 8 in the cavity of the cooling capillary 5 contracts due to temperature changes. In the high-temperature region, the adjusting spring 8 contracts, and the corresponding plug 9 slides upward, making the drain hole 503 larger and accelerating the drainage rate. In the low-temperature region, the adjusting spring 8 is in the low-temperature phase, and the drain hole 503 in the low-temperature region is smaller than that in the high-temperature region, resulting in a lower drainage rate. That is, by using the adjusting spring 8 made of temperature-adjusting memory metal material to extend and retract, the size of the drain hole 503 is adjusted, thereby adjusting the drainage rate of cooling water at different temperature locations, achieving precise cooling, improving the cooling effect, and preventing the cooling water temperature from increasing as cooling progresses closer to the needle 1, thus ensuring the cooling effect of the needle 1.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A temperature regulating device for an ablation needle, wherein the temperature regulating device is a water-cooled circulating catheter for varicose vein ablation, the water-cooled circulating catheter for varicose vein ablation comprises a needle tip, a connecting sleeve, a coaxial cable, a water-blocking sleeve, a cooling capillary tube, an inner sleeve, and an outer sleeve, characterized in that: A connecting sleeve is provided between the tail of the needle and the lower end of the outer sleeve. The upper end of the connecting sleeve is bonded to the lower end of the outer sleeve, and the lower end of the connecting sleeve is connected to the tail of the needle. The coaxial cable is built into the outer sleeve, and the lower end of the coaxial cable is fixedly connected to the needle. The middle sleeve and the cooling capillary are coaxially arranged inside the outer sleeve. The inner wall of the cooling capillary is in contact with the coaxial cable, and the middle sleeve is arranged between the cooling capillary and the outer sleeve. The lower ends of the cooling capillary and the middle sleeve are fixedly connected to the water-blocking sleeve. The upper end of the middle sleeve is connected to the cooling water inlet of the varicose vein ablation catheter to form a water inlet channel, and the upper end of the outer sleeve is connected to the cooling water outlet of the varicose vein ablation catheter to form a water outlet channel. The cooling capillary has multiple partitions evenly distributed inside, which divide the cooling capillary into multiple cavities. A water inlet is provided near the upper end of the cavity of the cooling capillary, and the water inlet is connected to the middle sleeve. A drain hole is provided near the lower end of the cavity of the cooling capillary, and the drain hole is connected to the outer sleeve.

2. The ablation needle temperature regulating device according to claim 1, characterized in that, The lower end of the connecting sleeve is bonded or welded to the tail of the needle.

3. The ablation needle temperature regulating device according to claim 1, characterized in that, The water-blocking sleeve is fitted onto the coaxial cable near the tail of the needle.

4. The ablation needle temperature regulating device according to claim 1, characterized in that, The cooling capillary tube is made of ultra-thin-walled, high-temperature resistant PI tube.

5. The ablation needle temperature regulating device according to claim 1, characterized in that, The inner and outer sleeves are made of PE EK or PE BAX material.

6. The ablation needle temperature regulating device according to claim 1, characterized in that, An adjusting spring and a plug are provided in the cavity of the cooling capillary. The plug is arc-shaped and closely attached to the inner wall near the drain hole. The upper part of the plug is fixedly connected to the lower end of the adjusting spring, and the upper end of the adjusting spring is fixedly connected to the upper part of the cavity of the cooling capillary.

7. The ablation needle temperature regulating device according to claim 6, characterized in that, The height of the plug is less than the height of the drain hole.

8. The ablation needle temperature regulating device according to claim 6, characterized in that, The adjusting spring is made of shape memory metal.

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