Microwave ablation equipment handle and microwave ablation catheter

Abstract

The utility model relates to a microwave ablation device handle and a microwave ablation catheter, comprising a microwave joint assembly configured to couple a microwave host, the microwave joint assembly comprising a pin and a joint body, the pin and the joint body being insulated; the water circulation assembly is configured to be used for cooling a guide pipe connected with the water circulation assembly; the coaxial cable is connected with the microwave connector assembly, penetrates through the water circulation assembly and extends to the far end of the catheter; the inner conductor of the coaxial cable is matched with the pin, and the outer conductor is matched with the joint body; the connecting base is arranged between the microwave connector assembly and the water circulation assembly, a sealing annular groove is formed between the connecting base and the microwave connector assembly, and a sealing ring is arranged in the sealing annular groove and used for preventing cooling water in the water circulation assembly from entering the microwave connector assembly to cause short circuit of the inner conductor and the outer conductor. A sealing ring is installed between the electrical part and the water circulation part of the handle, assembly is completed in an interference fit mode, and water is effectively prevented from entering the electrical part to cause short circuit.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a microwave ablation device handle and a microwave ablation catheter. Background Technology

[0002] Microwave ablation needles / catheters are precision medical consumables, and their structural design must balance ablation efficiency and patient safety. Currently, the microwave connectors of products on the market do not adequately consider waterproof performance. Insufficient waterproofing of microwave connectors may lead to liquid seepage during surgery, affecting the stability of microwave energy transmission, and even causing equipment malfunctions and safety hazards. Summary of the Invention

[0003] The purpose of this invention is to provide a sealed and reliable microwave connector structure to avoid the impact of liquid seepage on the stability of microwave energy transmission and the resulting safety hazards during surgery.

[0004] To achieve the above objectives, the present invention provides a technical solution as follows: a microwave ablation device handle, comprising a microwave connector assembly configured to couple a microwave host, wherein the microwave connector assembly includes a pin and a connector body, and the pin and the connector body are kept insulated.

[0005] A water circulation assembly is configured as a conduit for cooling and connection to the water circulation assembly;

[0006] A coaxial cable connects to the microwave connector assembly, passes through the water circulation assembly, and extends to the distal end of the conduit for transmitting microwave energy; the inner conductor of the coaxial cable mates with the pin, and the outer conductor mates with the connector body.

[0007] A connecting base is disposed between the microwave connector assembly and the water circulation assembly. A sealing annular groove is provided between the connecting base and the microwave connector assembly. A sealing ring is provided in the sealing annular groove to prevent cooling water in the water circulation assembly from entering the microwave connector assembly and causing a short circuit between the inner conductor and the outer conductor.

[0008] Furthermore, the sealing ring is installed into the sealing annular groove using an interference fit.

[0009] Furthermore, the sealing ring is made of an elastic material.

[0010] The beneficial effect of the first technical solution of this utility model is that a sealing ring is installed between the electrical part of the handle and the water circulation part, and the assembly is completed by interference fit, which effectively prevents water from entering the electrical part and causing a short circuit.

[0011] To achieve the above objectives, the second technical solution provided by this utility model is a microwave ablation catheter, comprising the microwave ablation device handle proposed in the first technical solution, and a catheter connected to the handle, wherein the catheter comprises a catheter body and a catheter tip;

[0012] The coaxial cable is disposed inside the conduit, and the inner conductor is connected to the head end of the conduit;

[0013] A metal ferrule is provided between the catheter body and the catheter tip, and the metal ferrule is connected to the outer conductor of the coaxial cable.

[0014] The beneficial effects of the second technical solution of this utility model are as follows: Due to the long length of the catheter, bending during medical procedures can cause a rapid increase in water pressure inside the catheter. Since the outer insulation layer of the coaxial cable cannot be sealed with glue, installing a sealing ring between the electrical part and the water circulation part at the handle can effectively prevent water leakage and short circuit at the catheter handle.

[0015] To achieve the above objectives, the third technical solution provided by this utility model is a microwave ablation catheter, comprising:

[0016] The microwave connector assembly is configured to couple the microwave host.

[0017] A water circulation assembly is configured as a conduit for cooling and connection to the water circulation assembly. The water circulation assembly includes a first housing and a second housing. The first housing is disposed between the microwave connector assembly and the second housing. The first housing contains a capillary tube for water return, and the second housing is for water inlet.

[0018] A coaxial cable, connecting the microwave connector assembly and passing through the water circulation assembly, extends to the distal end of the conduit for transmitting microwave energy.

[0019] The beneficial effect of the third technical solution of this utility model is as follows: By placing the return water passage between the microwave connector assembly and the inlet water passage, the probability of water entering the microwave connector and causing a short circuit is reduced because the return water pressure is lower than the inlet water pressure. If the inlet water passage is placed between the microwave connector assembly and the return water passage, the inlet water pressure will continuously increase due to the bending and blockage of the conduit, increasing the probability of water entering the microwave connector. By placing the return water passage between the microwave connector assembly and the inlet water passage, even if the conduit is bent or blocked, the return water pressure will continuously decrease until it disappears, and water will not enter the microwave connector.

[0020] Furthermore, the second housing and the conduit have a preset inlet cross-sectional area, the capillary has a preset throttling cross-sectional area, and the first housing has a preset return water cross-sectional area; the inlet cross-sectional area is larger than the throttling cross-sectional area, and the return water cross-sectional area is larger than the throttling cross-sectional area. Alternatively, the return water cross-sectional area is larger than the inlet cross-sectional area, which is larger than the throttling cross-sectional area. Minimizing the cross-sectional area of ​​the capillary is equivalent to adding a throttling element between the inlet and return water paths, achieving a pressure reduction and flow throttling effect, which can further reduce the probability of water entering the microwave connector. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the handle structure of the microwave ablation device of this utility model.

[0022] Figure 2 This is a schematic diagram of the coaxial cable structure of the microwave ablation device of this utility model.

[0023] Figure 3 This is a schematic diagram of the microwave ablation catheter structure of this utility model.

[0024] 1-Microwave connector assembly, 2-Connecting base, 3-Water circulation assembly, 4-Coaxial cable, 5-Inner conductor, 6-Dielectric layer, 7-Outer conductor, 8-Insulating sheath, 9-Folding sleeve, 10-Conduit tip, 11-Annular cavity, 12-Connector body, 13-Insulating bushing one, 14-Sealing annular groove, 15-Sealing ring, 16-Elastic folding sleeve, 17-Insulating bushing two, 18-Pin, 19-Hole, 20-Conduit, 21-Conduit body, 22-Metal folding sleeve, 23-PTFE bushing, 31-First housing, 32-Second housing, 33-Capillary tube. Detailed Implementation

[0025] To further understand the contents of this utility model, the following detailed description is provided in conjunction with the accompanying drawings. Example 1

[0026] The technical solution of this utility model provides, as follows: Figure 1 A microwave ablation device handle is shown, including a microwave connector assembly 1 configured to couple the microwave host. The microwave connector assembly 1 includes a pin 18 and a connector body 12, which are kept insulated from each other.

[0027] Water circulation component 3 is configured as a conduit 20 for cooling and connection of water circulation component 3;

[0028] like Figure 2As shown, the coaxial cable 4 in this embodiment has a four-layer structure: an inner conductor 5, a dielectric layer 6, an outer conductor 7, and an insulating sheath 8. The coaxial cable 4 connects to the microwave connector assembly 1, passes through the water circulation assembly 3, and extends to the distal end of the conduit 20 for transmitting microwave energy; the inner conductor 5 of the coaxial cable 4 mates with the pin 18, and the outer conductor 7 mates with the connector body 12.

[0029] The connecting base 2 is located between the microwave connector assembly 1 and the water circulation assembly 3. A sealing annular groove 14 is provided between the connecting base 2 and the microwave connector assembly 1. A sealing ring 15 is provided in the sealing annular groove 14 to prevent the cooling water in the water circulation assembly 3 from entering the microwave connector assembly 1, which would cause a short circuit between the inner conductor 5 and the outer conductor 7.

[0030] like Figure 1 As shown, the microwave connector assembly 1 in this embodiment includes an annular cavity 11 and a connector body 12; an insulating bushing 13 is also provided in the annular cavity 11, and the inner conductor 5 passes through the insulating bushing 13, so that the inner conductor 5 and the microwave connector assembly 1 are kept insulated, and the outer conductor 7 is provided on the connector body 12.

[0031] In this embodiment, the water circulation component 3 includes a first housing 31 and a second housing 32. The first housing 31 is also provided with a capillary tube 33. The first housing 31, the second housing 32 and the capillary tube 33 are used for the circulation of cooling water.

[0032] In this embodiment, the microwave connector assembly 1 is also provided with an elastic sleeve 16 and an insulating bushing 17. The elastic sleeve 16 is interference-fitted with the microwave connector assembly 1. The inner conductor 5 of the coaxial cable 4 is welded to the pin 18 and then assembled into the microwave connector assembly 1 together with the insulating bushing 13 and the insulating bushing 17. The outer conductor 7 of the coaxial cable 4 is soldered to the connector body 12 through the hole 19 on the connector body 12 to meet the grounding requirements. A sealing ring 15 is installed on the outer insulating sheath 8 of the coaxial cable 4. At the same time, the connecting base 2 is axially pressed and assembled with the microwave connector assembly 1. The radial compression of the sealing ring 15 deforms to achieve a sealing and waterproof effect.

[0033] In this embodiment, the front end of the second housing 32 is also equipped with a retainer 9 for connecting with the conduit 20.

[0034] The microwave ablation device handle proposed in this embodiment can prevent water leakage that could cause a short circuit, and it can also prevent air leakage. Example 2

[0035] The second technical solution of this utility model provides, as follows: Figure 3 The microwave ablation catheter shown includes a provided microwave ablation device handle, with a catheter 20 connected to the front end of the handle. The catheter 20 includes a catheter tip 10, an elongated catheter body 21, and a radiation unit located inside the catheter body 21.

[0036] A metal sleeve 22 is provided between the conduit body 21 and the conduit tip 10. A PTFE bushing 23 is installed between the metal sleeve 22 and the conduit tip 10 to form a radiation window with a preset distance for radiating microwave energy. The PTFE bushing 23 is installed on the cylinder at the tail of the conduit tip 10. A coaxial cable 4 extends to the conduit tip 10. The inner conductor 5 is fixedly connected to the conduit tip 10, and the outer conductor 7 is fixedly connected to the metal sleeve 22. The conduit tip 10 (positive pole), the PTFE bushing 23 (slot), and the metal sleeve 22 (ground) are combined together to form a microwave slot antenna. The front metal sleeve 22 and the outer conductor 7 form a loop. Example 3

[0037] The technical solution provided in this embodiment three is illustrated using the accompanying drawings of embodiment one.

[0038] This embodiment proposes, as follows: Figure 1 The microwave ablation catheter shown includes

[0039] Microwave connector assembly 1 is configured to couple a microwave host;

[0040] The water circulation assembly 3 is configured as a conduit 20 for cooling and connecting the water circulation assembly 3. The water circulation assembly 3 includes a first housing 31 and a second housing 32. The first housing 31 is located between the microwave connector assembly 1 and the second housing 32. The first housing 31 is provided with a capillary tube 33 for water return, and the second housing 32 is used for water inlet.

[0041] Coaxial cable 4 connects to microwave connector assembly 1, passes through water circulation assembly 3, and extends to the distal end of the conduit for transmitting microwave energy. Placing the return water passage between microwave connector assembly 1 and the inlet water passage reduces the probability of water entering the microwave connector, thus preventing a short circuit, because the return water pressure is lower than the inlet water pressure. If the inlet water passage is placed between the microwave connector assembly and the return water passage, the inlet water pressure will continuously increase due to conduit bending or blockage, increasing the probability of water entering the microwave connector. Placing the return water passage between the microwave connector assembly and the inlet water passage ensures that even if the conduit is bent or blocked, the return water pressure will continuously decrease until it disappears, preventing water from entering the microwave connector.

[0042] The second housing 32 and the conduit 20 have a preset inlet water cross-sectional area, the capillary tube 33 has a preset throttling cross-sectional area, and the first housing 31 has a preset return water cross-sectional area. The inlet water cross-sectional area is designed to be larger than the throttling cross-sectional area, and the return water cross-sectional area is designed to be larger than the throttling cross-sectional area. Alternatively, the return water cross-sectional area is designed to be larger than both the inlet water cross-sectional area and the throttling cross-sectional area. Minimizing the cross-sectional area of ​​the capillary tube 33 is equivalent to adding a throttling element between the inlet and return water passages, which serves to reduce pressure and throttle flow, further reducing the probability of water entering the microwave connector.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A handle for a microwave ablation device, characterized in that: include A microwave connector assembly configured to couple a microwave host, the microwave connector assembly including a pin and a connector body, the pin and the connector body being insulated from each other; A water circulation assembly is configured as a conduit for cooling and connection to the water circulation assembly; A coaxial cable, connecting the microwave connector assembly and passing through the water circulation assembly, extends to the distal end of the conduit for transmitting microwave energy; The inner conductor of the coaxial cable mates with the pin, and the outer conductor mates with the connector body; A connecting base is disposed between the microwave connector assembly and the water circulation assembly. A sealing annular groove is provided between the connecting base and the microwave connector assembly. A sealing ring is provided in the sealing annular groove to prevent cooling water in the water circulation assembly from entering the microwave connector assembly and causing a short circuit between the inner conductor and the outer conductor.

2. The handle of the microwave ablation device according to claim 1, characterized in that: The sealing ring is installed into the sealing annular groove using an interference fit.

3. The handle of the microwave ablation device according to claim 1, characterized in that: The sealing ring is made of an elastic material.

4. A microwave ablation catheter, comprising the handle of the microwave ablation device as described in claim 1, characterized in that: The device includes a conduit connected to the handle, the conduit comprising a conduit body and a conduit tip; a coaxial cable disposed within the conduit, and the inner conductor being connected to the conduit tip; a metal ferrule being provided between the conduit body and the conduit tip, the metal ferrule being connected to the outer conductor of the coaxial cable.

5. A microwave ablation catheter, characterized in that: include The microwave connector assembly is configured to couple the microwave host. A water circulation assembly is configured as a conduit for cooling and connection to the water circulation assembly. The water circulation assembly includes a first housing and a second housing. The first housing is disposed between the microwave connector assembly and the second housing. The first housing contains a capillary tube for water return, and the second housing is for water inlet. A coaxial cable, connecting the microwave connector assembly and passing through the water circulation assembly, extends to the distal end of the conduit for transmitting microwave energy.

6. The microwave ablation catheter according to claim 5, characterized in that: The second housing and the conduit have a preset water inlet cross-sectional area, the capillary has a preset throttling cross-sectional area, and the first housing has a preset water return cross-sectional area; the water inlet cross-sectional area is larger than the throttling cross-sectional area, and the water return cross-sectional area is larger than the throttling cross-sectional area.

7. The microwave ablation catheter according to claim 6, characterized in that: Or the return water cross-sectional area is greater than the inlet water cross-sectional area, which is greater than the throttling cross-sectional area.

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