Microwave ablation equipment handle and microwave ablation catheter

Abstract

The invention relates to a microwave ablation device handle, comprising: a microwave connector assembly configured to couple a microwave host, the microwave connector assembly comprising a pin and a connector body, the pin and the connector 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] The present invention relates to the technical field of medical devices, and in particular to a microwave ablation device handle and a microwave ablation catheter. Background Art

[0002] Microwave ablation needles / catheters are precision medical consumables, and their structural design must take into account both ablation efficiency and patient safety. The microwave connectors of current products on the market do not fully consider waterproof performance. Insufficient waterproofness of microwave connectors may affect the transmission stability of microwave energy due to liquid infiltration during surgery, and even cause equipment failure and safety hazards. Summary of the invention

[0003] The purpose of the present invention is to provide a sealed and reliable microwave joint structure to avoid the transmission stability of microwave energy and the potential safety hazards caused by liquid infiltration during surgery.

[0004] To achieve the above-mentioned purpose, the present invention provides a technical solution 1, a microwave ablation device handle: comprising a microwave connector assembly configured to couple a microwave host, the microwave connector assembly comprising a pin and a connector body, the pin and the connector body being insulated; A water circulation component configured to cool a conduit connected to the water circulation component; A coaxial cable is connected to the microwave connector assembly, passes through the water circulation assembly, and extends to the distal end of the catheter for transmitting microwave energy; the inner conductor of the coaxial cable cooperates with the pin, and the outer conductor cooperates with the connector body; A connecting base is arranged between the microwave joint assembly and the water circulation assembly. A sealing annular groove is arranged between the connecting base and the microwave joint assembly. A sealing ring is arranged in the sealing annular groove to prevent cooling water in the water circulation assembly from entering the microwave joint assembly, causing a short circuit between the inner conductor and the outer conductor.

[0005] Furthermore, the sealing ring is installed into the sealing annular groove by means of interference fit.

[0006] Furthermore, the sealing ring is made of elastic material.

[0007] The beneficial effect of the technical solution 1 of the present invention 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.

[0008] To achieve the above-mentioned purpose, the second technical solution provided by the present invention 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 head end; The coaxial cable is arranged in the catheter, and the inner conductor is connected to the catheter head end; A metal ferrule is provided between the catheter body and the catheter head end, and the metal ferrule is connected to the outer conductor of the coaxial cable.

[0009] The beneficial effect of the second technical solution of the present invention is that: due to the long length of the catheter, during the medical process, bending will cause the water pressure inside the catheter to rise rapidly. Since the outer insulation layer of the coaxial cable cannot be fixed and sealed with glue, a sealing ring is installed between the electrical part and the water circulation part at the handle, which can effectively prevent water leakage at the catheter handle and short circuit.

[0010] To achieve the above object, the present invention provides a third technical solution, which is a microwave ablation catheter, comprising A microwave connector assembly configured to couple to a microwave host; A water circulation assembly is configured to cool a conduit connected to the water circulation assembly, the water circulation assembly comprises a first box and a second box, the first box is arranged between the microwave joint assembly and the second box, a capillary is arranged in the first box for water return, and the second box is for water inlet; A coaxial cable is connected to the microwave joint assembly, passes through the water circulation assembly, and extends to the far end of the catheter for transmitting microwave energy.

[0011] The beneficial effect of the third technical solution of the present invention is: the return water passage is set between the microwave joint assembly and the water inlet passage. Since the return water pressure is less than the water inlet pressure, the probability of water entering the microwave joint will be reduced, resulting in a short circuit. If the water inlet passage is set between the microwave joint assembly and the return water passage, the water inlet pressure will continue to increase due to the bending and blockage of the conduit, which will increase the probability of water entering the microwave joint. The return water passage is set between the microwave joint assembly and the water inlet passage. Even if the conduit is bent and blocked, the return water pressure will continue to decrease until there is no water, and water will not enter the microwave joint.

[0012] Furthermore, there is a preset water inlet cross-sectional area between the second box and the conduit, the capillary has a preset throttling cross-sectional area, and the first box 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. Or the water return cross-sectional area is larger than the water inlet cross-sectional area and larger than the throttling cross-sectional area. Designing the cross-sectional area of ​​the capillary to be the smallest is equivalent to adding a throttling element between the water inlet passage and the water return passage, which plays the role of reducing pressure and throttling, and can further reduce the probability of water entering the microwave joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the microwave ablation device handle of the present invention.

[0014] Figure 2 This is a schematic diagram of the coaxial cable structure of the microwave ablation equipment of the present invention.

[0015] Figure 3 It is a schematic diagram of the structure of the microwave ablation catheter of the present invention.

[0016] 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-ferrule, 10-catheter head, 11-annular cavity, 12-connector body, 13-insulating bushing 1, 14-sealing annular groove, 15-sealing ring, 16-elastic ferrule, 17-insulating bushing 2, 18-pin, 19-hole, 20-catheter, 21-catheter body, 22-metal ferrule, 23-PTFE bushing, 31-first box, 32-second box, 33-capillary. DETAILED DESCRIPTION

[0017] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. Embodiment 1

[0018] The technical solution 1 of the present invention provides Figure 1 A microwave ablation device handle shown includes a microwave connector assembly 1, which is configured to be coupled to the microwave host. The microwave connector assembly 1 includes a pin 18 and a connector body 12, and the pin 18 and the connector body 12 are insulated. The water circulation component 3 is configured to be used for cooling the conduit 20 connected to the water circulation component 3; like Figure 2 As 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 is connected to the microwave connector assembly 1, passes through the water circulation assembly 3, and extends to the far end of the conduit 20 for transmitting microwave energy; the inner conductor 5 of the coaxial cable 4 cooperates with the pin 18, and the outer conductor 7 cooperates with the connector body 12; The connecting base 2 is arranged between the microwave joint assembly 1 and the water circulation assembly 3. A sealing annular groove 14 is provided between the connecting base 2 and the microwave joint 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 joint assembly 1, causing a short circuit between the inner conductor 5 and the outer conductor 7.

[0019] like Figure 1 As shown, the microwave joint assembly 1 in this embodiment includes an annular cavity 11 and a joint 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 joint assembly 1 are kept insulated, and the outer conductor 7 is provided on the joint body 12; The water circulation assembly 3 in this embodiment includes a first box body 31 and a second box body 32. A capillary tube 33 is further provided in the first box body 31. The first box body 31, the second box body 32 and the capillary tube 33 are used for the circulation of cooling water.

[0020] The microwave joint assembly 1 in this embodiment is further provided with an elastic ferrule 16 and an insulating bushing 17. The elastic ferrule 16 is connected to the microwave joint assembly 1 by interference fit. The inner conductor 5 of the coaxial cable 4 is welded to the pin 18 and then assembled into the microwave joint 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 joint body 12 through the hole 19 on the joint body 12 to meet the grounding requirements. The sealing ring 15 is assembled on the outer insulating sheath 8 of the coaxial cable 4. At the same time, the base 2 is axially crimped and assembled with the microwave joint assembly 1, and the sealing ring 15 is radially squeezed and deformed to achieve a sealing and waterproof effect.

[0021] In this embodiment, a ferrule 9 is also installed at the front end of the second box body 32 for connecting with the conduit 20 .

[0022] The microwave ablation device handle proposed in this embodiment can not only prevent short circuit caused by water leakage, but also prevent air leakage. Embodiment 2

[0023] The second technical solution of the present invention provides Figure 3 A microwave ablation catheter shown includes a microwave ablation device handle provided in an embodiment, a catheter 20 is connected to the front end of the handle, and the catheter 20 includes a catheter head 10, an elongated catheter body 21 and a radiation unit located inside the catheter body 21.

[0024] A metal ferrule 22 is provided between the catheter body 21 and the catheter head end 10, and a polyfluoroethylene sleeve 23 is installed between the metal ferrule 22 and the catheter head end 10 to form a radiation window with a preset distance for radiating microwave energy; the polyfluoroethylene sleeve 23 is installed on the cylinder at the tail of the catheter head end 10, the coaxial cable 4 extends to the catheter head end 10, the inner conductor 5 and the catheter head end 10 are fixedly connected, the outer conductor 7 and the metal ferrule 22 are fixedly connected, the catheter head end 10 (positive pole), the polyfluoroethylene sleeve 23 (gap), and the metal ferrule 22 (ground) are combined together to form a microwave slot antenna, and the front end metal ferrule 22 and the outer conductor 7 form a loop. Embodiment 3

[0025] The technical solution provided in the third embodiment is described using the drawings of the first embodiment.

[0026] This embodiment proposes Figure 1 A microwave ablation catheter is shown, comprising A microwave connector assembly 1 is configured to couple to a microwave host; The water circulation component 3 is configured to cool the conduit 20 connected to the water circulation component 3. The water circulation component 3 includes a first box 31 and a second box 32. The first box 31 is arranged between the microwave joint component 1 and the second box 32. A capillary tube 33 is arranged in the first box 31 for returning water, and the second box 32 is used for inlet water. The coaxial cable 4 is connected to the microwave connector assembly 1, passes through the water circulation assembly 3, and extends to the far end of the conduit for transmitting microwave energy. The return water passage is set between the microwave connector assembly 1 and the water inlet passage. Since the return water pressure is less than the water inlet pressure, the probability of water entering the microwave connector will be reduced, resulting in a short circuit. If the water inlet passage is set between the microwave connector assembly and the return water passage, the water inlet pressure will continue to increase due to the bending and blockage of the conduit, which will increase the probability of water entering the microwave connector. The return water passage is set between the microwave connector assembly and the water inlet passage. Even if the conduit is bent and blocked, the return water pressure will continue to decrease until there is no water, and water will not enter the microwave connector.

[0027] There is a preset water inlet cross-sectional area between the second box 32 and the conduit 20, the capillary 33 has a preset throttling cross-sectional area, and the first box 31 has a preset water return cross-sectional area; the water inlet cross-sectional area is designed to be larger than the throttling cross-sectional area, and the water return cross-sectional area is designed to be larger than the throttling cross-sectional area. Or the water return cross-sectional area is designed to be larger than the water inlet cross-sectional area and larger than the throttling cross-sectional area. Designing the cross-sectional area of ​​the capillary 33 to be the smallest is equivalent to adding a throttling element between the water inlet passage and the water return passage, which plays the role of reducing pressure and throttling, and can further reduce the probability of water entering the microwave joint.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A microwave ablation device handle, characterized in that: include A microwave joint assembly, configured to be coupled to a microwave host, the microwave joint assembly comprising a pin and a joint body, wherein the pin and the joint body are insulated; A water circulation component configured to cool a conduit connected to the water circulation component; A coaxial cable connected to the microwave joint assembly, passing through the water circulation assembly, and extending to the distal end of the catheter for transmitting microwave energy; The inner conductor of the coaxial cable matches with the pin, and the outer conductor matches with the connector body; A connecting base is arranged between the microwave joint assembly and the water circulation assembly. A sealing annular groove is arranged between the connecting base and the microwave joint assembly. A sealing ring is arranged in the sealing annular groove to prevent cooling water in the water circulation assembly from entering the microwave joint assembly, causing a short circuit between the inner conductor and the outer conductor.

2. The ablation catheter handle according to claim 1, characterized in that: The sealing ring is installed into the sealing annular groove by means of interference fit.

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

4. A microwave ablation catheter, comprising the microwave ablation device handle according to claim 1, characterized in that: A catheter connected to the handle, the catheter comprising a catheter body and a catheter head; The coaxial cable is arranged in the catheter, and the inner conductor is connected to the catheter head end; A metal ferrule is provided between the catheter body and the catheter head end, and the metal ferrule is connected to the outer conductor of the coaxial cable.

5. A microwave ablation catheter, characterized in that: include A microwave connector assembly configured to couple to a microwave host; A water circulation assembly is configured to cool a conduit connected to the water circulation assembly, the water circulation assembly comprises a first box and a second box, the first box is arranged between the microwave joint assembly and the second box, a capillary is arranged in the first box for water return, and the second box is for water inlet; A coaxial cable is connected to the microwave joint assembly, passes through the water circulation assembly, and extends to the far end of the catheter for transmitting microwave energy.

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

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