Air-cooling microwave ablation equipment

Abstract

The invention relates to an air-cooled microwave ablation device which comprises an ablation needle and a microwave ablation main machine. A cooling gas control unit is arranged in the microwave ablation host, an air inlet channel and an air outlet channel are arranged in the ablation needle, the air inlet channel is communicated with the air outlet end of the cooling gas control unit through an air inlet pipe, and the air outlet channel is communicated with the air inlet end of the cooling gas control unit through an air outlet pipe. The cooling gas control unit cools the gas medium, then the cooled gas medium is fed into the gas inlet channel in the ablation needle through the gas inlet pipe to be cooled, and the acted gas returns to the cooling gas control unit through the gas outlet channel to be cooled again. Oxidation caused by reaction of water and copper in an ablation needle structural part in a traditional water cooling structure is avoided, the situation of water leakage of a cooling system is eradicated, ablation equipment is effectively protected, disturbance to an energy field emitted by an ablation needle is avoided, and the gas consumption is reduced through a circulating backflow cooling mode.

Description

Technical Field

[0001] The present invention relates to the technical field of microwave ablation equipment, and in particular to an air-cooled microwave ablation equipment. Background Art

[0002] As an advanced medical method, microwave ablation technology has been widely used in tumor treatment and other medical fields. Microwave ablation equipment transmits microwave energy to the target tissue to produce a thermal effect, thereby achieving the purpose of ablation. This type of equipment usually includes basic types without cooling systems and advanced types with built-in cooling systems. In equipment with built-in cooling systems, water cooling structures are widely used due to their efficient heat dissipation performance.

[0003] However, there are a series of technical problems in the actual application of water cooling structure, which limits the performance improvement and safety guarantee of microwave ablation equipment. Specifically, the water cooling structure has the following main defects:

[0004] Oxidation reaction problem: Due to the contact between water and the copper material in the ablation needle structure, chemical reactions are likely to occur over a long period of time, generating products such as copper oxide. These oxidation products will not only affect the performance of the ablation needle, such as electrical conductivity and thermal conductivity, but may also have an adverse effect on the stability and reliability of the device. In addition, the oxidation reaction may also accelerate the corrosion of the ablation needle and shorten its service life.

[0005] Water leakage risk: The water cooling structure relies on a complex circulation system to maintain water flow and heat dissipation. However, once this circulation system leaks, it will have a serious negative impact on the live ablation equipment and other medical equipment in operation. Water leakage may not only cause moisture inside the equipment, increase the risk of short circuits and electrical failures, but also pose a threat to the safety of operators.

[0006] Energy field disturbance: During microwave ablation, the antenna of the ablation needle is responsible for emitting microwave energy to form an energy field. However, water will disturb the energy field during circulation. This disturbance may lead to uneven energy distribution, affecting the ablation effect and accuracy. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an air-cooled microwave ablation device to overcome the deficiencies in the above-mentioned prior art.

[0008] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: an air-cooled microwave ablation device, comprising an ablation needle and a microwave ablation host; the coaxial cable and temperature measuring line of the ablation needle are electrically connected to the microwave source control unit of the microwave ablation host; a cooling gas control unit is arranged in the microwave ablation host, and an air inlet channel and an air outlet channel are arranged in the ablation needle, the air inlet channel is connected to the air outlet end of the cooling gas control unit through an air inlet pipe, the air outlet channel is connected to the air inlet end of the cooling gas control unit through an air outlet pipe, and the air inlet end of the cooling gas control unit is externally connected to a gas storage tank or a gas medium preparation device.

[0009] The beneficial effects of the present invention are: an inert gas medium is transported to the equipment, the gas medium is cooled by a cooling gas control unit, and then the cooled gas medium is sent from an air inlet pipe into an air inlet channel inside the ablation needle for cooling. The gas after the action returns to the cooling gas control unit from an air outlet channel for further cooling, thereby avoiding oxidation caused by the reaction between water and copper in the ablation needle structure in a traditional water cooling structure, eliminating water leakage in the cooling system, effectively protecting the ablation equipment, avoiding disturbances to the energy field emitted by the ablation needle, and reducing gas consumption through a circulating reflux cooling method.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Further, the cooling gas control unit includes a cooling device, a cooling pipe, a return pipe, a boost valve, a one-way gas valve and an electronic gas valve;

[0012] An electronic gas valve, a cooling device and a boost valve are sequentially arranged on the cooling pipe along the air flow direction. The air inlet end of the electronic gas valve is externally connected to a gas storage tank or a gas medium preparation device. The air outlet end of the return pipe is connected to the cooling pipe and is located between the cooling device and the electronic gas valve. A one-way gas valve is arranged at the end of the return pipe.

[0013] The air outlet end of the cooling pipe is communicated with the air inlet pipe, and the air inlet end of the return pipe is communicated with the air outlet pipe.

[0014] Furthermore, temperature sensors are respectively provided at both ends of the cooling device.

[0015] Furthermore, an air pressure detection module is provided at the air outlet of the boost valve.

[0016] Furthermore, the ablation needle includes a handle, a needle rod and a needle head; an air inlet cavity and an air outlet cavity are arranged in the handle, the air inlet cavity is connected to the air inlet tube, and the air outlet cavity is connected to the air outlet tube;

[0017] The needle bar includes an outer tube, an inner tube, a cable protection tube and a coaxial cable which are sequentially sleeved from the outside to the inside; an air inlet channel is formed between the inner tube and the cable protection tube, and an air outlet channel is formed between the outer tube and the inner tube; the rear end of the air inlet channel is connected to the air inlet cavity, and the rear end of the air outlet channel is connected to the air outlet cavity;

[0018] The needle is sealably inserted in the front end of the outer tube, an antenna is arranged inside the needle, the inner conductor of the coaxial cable extends into the antenna, a choke ring is arranged in the outer tube, the rear end of the choke ring is sealably inserted in the front end of the inner tube, the front end of the choke ring is sealably abutted against the insertion part of the needle, a connecting hole is opened in the front end peripheral wall of the inner tube, and the air inlet channel and the air outlet channel are connected through the connecting hole.

[0019] Furthermore, a connecting piece is provided in the handle, and a block is provided in the middle of the connecting piece, which separates the inner cavity of the connecting piece into an air inlet cavity and an air outlet cavity; the outer tube seal is inserted in the front end of the connecting piece and is connected to the air inlet cavity; a through hole is provided in the middle of the block, and the inner tube seal is inserted in the through hole and is connected to the air outlet cavity.

[0020] Furthermore, it also includes a protective sleeve; the protective sleeve is detachably connected to the front end of the handle.

[0021] Furthermore, an annular slot is provided at the front end of the handle, and the rear end of the protective sleeve is inserted into the annular slot.

[0022] Furthermore, a silicone sleeve for sleeved on the needle rod is arranged in the protective sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the overall structural diagram of the present invention;

[0024] Figure 2 It is a structural block diagram of the cooling gas control unit of the present invention;

[0025] Figure 3 is a schematic diagram of the structure of the ablation needle of the present invention;

[0026] Figure 4 The cross-sectional structure of the ablation needle of the present invention is shown in FIG. Figure 1 ;

[0027] Figure 5 The cross-sectional structure of the ablation needle of the present invention is shown in FIG. Figure 2 ;

[0028] Figure 6 This is an enlarged view of the local cross-sectional structure of the ablation needle of the present invention. Figure 1 ;

[0029] Figure 7 This is an enlarged view of the local cross-sectional structure of the ablation needle of the present invention. Figure 2 ;

[0030] Figure 8 This is an enlarged view of the local cross-sectional structure of the ablation needle of the present invention. Figure 3 ;

[0031] Fig. 9 This is an enlarged view of the local cross-sectional structure of the ablation needle of the present invention. Figure 4.

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] 1. Ablation needle; 12. Temperature measuring line; 13. Air inlet pipe; 14. Air outlet pipe; 15. Handle; 151. Annular slot; 16. Needle rod; 161. Outer tube; 162. Inner tube; 163. Cable protection tube; 164. Coaxial cable; 165. Air inlet channel; 166. Air outlet channel; 167. Choke ring; 168. Connecting hole; 17. Needle; 171. Antenna; 18. Connecting piece; 181. Air inlet cavity; 182. Air outlet cavity; 183. Block; 184. Through hole; 19. Protective sleeve; 191. Silicone sleeve; 2. Microwave ablation host; 21. Microwave source control unit; 22. Cooling gas control unit; 221. Cooling device; 222. Cooling tube; 223. Reflux tube; 224. Boosting valve; 225. One-way gas valve; 226. Electronic gas valve. DETAILED DESCRIPTION

[0034] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0035] like Figures 1 to 9 As shown, Example 1, an air-cooled microwave ablation device, includes an ablation needle 1 and a microwave ablation host 2; the coaxial cable 164 and the temperature measuring line 12 of the ablation needle 1 are electrically connected to the microwave source control unit 21 of the microwave ablation host 2; a cooling gas control unit 22 is arranged in the microwave ablation host 2, and an air inlet channel 165 and an air outlet channel 166 are arranged in the ablation needle 1, the air inlet channel 165 is connected to the air outlet end of the cooling gas control unit 22 through the air inlet pipe 13, the air outlet channel 166 is connected to the air inlet end of the cooling gas control unit 22 through the air outlet pipe 14, and the air inlet end of the cooling gas control unit 22 is externally connected to a gas storage tank or a gas medium preparation device.

[0036] An inert gas medium is transported to the device, and the cooling gas control unit 22 cools the gas medium. The cooled gas medium is then fed into the air inlet channel 165 inside the ablation needle 1 through the air inlet pipe 13 for cooling. The gas after the cooling returns to the cooling gas control unit 22 through the air outlet channel 166 for further cooling. This avoids oxidation caused by the reaction between water and copper in the structural parts of the ablation needle 1 in the traditional water-cooling structure, eliminates water leakage in the cooling system, effectively protects the ablation equipment, avoids disturbance of the energy field emitted by the ablation needle 1, and reduces gas consumption through the circulating reflux cooling method.

[0037] In the specific implementation, the gas medium uses an inert gas, such as helium, which is not easy to react with other substances and is not toxic to organisms and the environment. Its gaseous specific heat capacity is 5190J / (kg*℃), which is greater than 4200J / (kg*℃) of water. It can be used as a cooling medium and can be recycled.

[0038] Embodiment 2: This embodiment is a further improvement on the basis of embodiment 1, and its details are as follows:

[0039] The cooling gas control unit 22 includes a cooling device 221, a cooling pipe 222, a return pipe 223, a boost valve 224, a one-way gas valve 225 and an electronic gas valve 226;

[0040] An electronic gas valve 226, a cooling device 221 and a boost valve 224 are sequentially arranged on the cooling pipe 222 along the air flow direction. The air inlet end of the electronic gas valve 226 is externally connected to a gas storage tank or a gas medium preparation device. The air outlet end of the return pipe 223 is connected to the cooling pipe 222 and is located between the cooling device 221 and the electronic gas valve 226. A one-way gas valve 225 is arranged at the end of the return pipe 223.

[0041] The air outlet end of the cooling pipe 222 is communicated with the air inlet pipe 13 , and the air inlet end of the return pipe 223 is communicated with the air outlet pipe 14 .

[0042] The gas medium enters from a gas tank or a cooling gas preparation device, passes through the electronic gas valve 226 and enters the cooling tube 222. After the cooling tube 222 is filled with the gas medium, the electronic gas valve 226 is closed, and the gas medium is cooled by the cooling device 221. After cooling, it is pressurized by the boost valve 224 and sent to the air inlet pipe 13 to cool the ablation needle 1. The high-temperature gas medium discharged from the air outlet pipe 14 enters the return pipe 223 from the air outlet pipe 14, and then flows back to the cooling device 221 through the one-way gas valve 225 for further cooling. The gas consumption is greatly reduced by the circulating cooling use of the gas medium.

[0043] Embodiment 3, this embodiment is a further improvement on the basis of embodiment 2, and its details are as follows:

[0044] Temperature sensors are respectively provided at both ends of the cooling device 221 to monitor the temperature before and after cooling in real time, so as to adjust the cooling device 221 according to actual conditions.

[0045] Embodiment 4: This embodiment is a further improvement on the basis of embodiment 2, and its details are as follows:

[0046] The outlet end of the boost valve 224 is provided with a gas pressure detection module, which can monitor in real time whether the gas pressure in the cooling pipe 222 is sufficient. If it is insufficient, the electronic gas valve 226 is opened to add gas medium.

[0047] Embodiment 5: This embodiment is a further improvement on the basis of any one of Embodiments 2 to 4, and its details are as follows:

[0048] The ablation needle 1 includes a handle 15, a needle rod 16 and a needle head 17; an air inlet cavity 181 and an air outlet cavity 182 are provided in the handle 15, the air inlet cavity 181 is connected to the air inlet tube 13, and the air outlet cavity 182 is connected to the air outlet tube 14;

[0049] The needle rod 16 includes an outer tube 161, an inner tube 162, a cable protection tube 163 and a coaxial cable 164 which are sequentially sleeved from the outside to the inside; an air inlet channel 165 is formed between the inner tube 162 and the cable protection tube 163, and an air outlet channel 166 is formed between the outer tube 161 and the inner tube 162; the rear end of the air inlet channel 165 is communicated with the air inlet cavity 181, and the rear end of the air outlet channel 166 is communicated with the air outlet cavity 182;

[0050] The needle 17 is sealably inserted in the front end of the outer tube 161, an antenna 171 is arranged inside the needle 17, the inner conductor of the coaxial cable 164 extends into the interior of the antenna 171, a choke ring 167 is arranged in the outer tube 161, the rear end of the choke ring 167 is sealably inserted in the front end of the inner tube 162, the front end of the choke ring 167 is sealably abutted against the insertion part of the needle 17, a connecting hole 168 is opened on the front end peripheral wall of the inner tube 162, and the air inlet channel 165 is connected with the air outlet channel 166 through the connecting hole 168.

[0051] After the cooled gas medium enters the air inlet cavity 181, the gas medium enters from the air inlet channel 165 between the inner tube 162 and the cable protection tube 163 to cool the coaxial cable 164. The gas medium after cooling enters the air outlet channel 166 through the connecting hole 168, and then returns to the cooling tube 222 through the air outlet cavity 182, the air outlet pipe 14, and the return pipe 223, and is again cooled by circulating air cooling through the cooling device 221, which has a better cooling effect and greatly saves gas consumption.

[0052] In a specific implementation, the material of the antenna 171 is copper alloy. The antenna 171 made of copper alloy has good electrical conductivity, good thermal conductivity, and low processing difficulty. In addition, the material of the needle 173 is zirconia ceramic. The needle 173 made of zirconia ceramic is resistant to high temperature, high strength, and high relative dielectric constant.

[0053] Embodiment 6: This embodiment is a further improvement on the basis of embodiment 5, and its details are as follows:

[0054] A connector 18 is provided in the handle 15, and a stopper 183 is provided in the middle of the connector 18. The stopper 183 separates the inner cavity of the connector 18 into an air inlet cavity 181 and an air outlet cavity 182. The outer tube 161 is sealed and plugged into the front end of the connector 18, and communicates with the air inlet cavity 181. A through hole 184 is provided in the middle of the stopper 183, and the inner tube 162 is sealed and plugged into the through hole 184, and communicates with the air outlet cavity 182. It is easier to process and assemble, and the sealing effect is better.

[0055] Embodiment 7, this embodiment is a further improvement on the basis of embodiment 5, and its details are as follows:

[0056] The protective sleeve 19 is detachably connected to the front end of the handle 15. The protective sleeve 19 can effectively protect the needle 17, preventing the needle 17 from being damaged by collision or knock before use, and can also prevent the needle 17 from piercing the sealed bag before use.

[0057] Embodiment 8, this embodiment is a further improvement on the basis of embodiment 7, and its details are as follows:

[0058] The front end of the handle 15 is provided with an annular slot 151, and the rear end of the protective sleeve 19 is inserted into the annular slot 151. The protective sleeve 19 and the handle 15 are detachably arranged, and the disassembly and installation are convenient.

[0059] Embodiment 9: This embodiment is a further improvement based on any one of Embodiments 7 or 8, and its details are as follows:

[0060] A silicone sleeve 191 for sleeved on the needle rod 16 is arranged in the protective sleeve 19. The silicone sleeve 191 can prevent the needle rod 16 from loosening and bending due to shaking during transportation.

[0061] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An air-cooled microwave ablation device, characterized in that: The invention comprises an ablation needle (1) and a microwave ablation main unit (2); the coaxial cable (164) and the temperature measuring line (12) of the ablation needle (1) are electrically connected to the microwave source control unit (21) of the microwave ablation main unit (2); a cooling gas control unit (22) is arranged in the microwave ablation main unit (2); an air inlet channel (165) and an air outlet channel (166) are arranged in the ablation needle (1); the air inlet channel (165) is connected to the air outlet end of the cooling gas control unit (22) through an air inlet pipe (13); the air outlet channel (166) is connected to the air inlet end of the cooling gas control unit (22) through an air outlet pipe (14); and the air inlet end of the cooling gas control unit (22) is externally connected to a gas storage tank or a gas medium preparation device.

2. The air-cooled microwave ablation device according to claim 1, characterized in that: The cooling gas control unit (22) comprises a cooling device (221), a cooling pipe (222), a return pipe (223), a boost valve (224), a one-way gas valve (225) and an electronic gas valve (226); The electronic gas valve (226), the cooling device (221) and the boost valve (224) are sequentially arranged on the cooling pipe (222) along the air flow direction; the air inlet end of the electronic gas valve (226) is externally connected to a gas storage tank or a gas medium preparation device; the air outlet end of the return pipe (223) is connected to the cooling pipe (222) and is located between the cooling device (221) and the electronic gas valve (226); the one-way gas valve (225) is arranged at the end of the return pipe (223); The air outlet end of the cooling pipe (222) is in communication with the air inlet pipe (13), and the air inlet end of the return pipe (223) is in communication with the air outlet pipe (14).

3. The air-cooled microwave ablation device according to claim 2, characterized in that: Temperature sensors are respectively arranged at both ends of the cooling device (221).

4. The air-cooled microwave ablation device according to claim 2, characterized in that: The air outlet end of the boost valve (224) is provided with an air pressure detection module.

5. An air-cooled microwave ablation device according to any one of claims 2 to 4, characterized in that: The ablation needle (1) comprises a handle (15), a needle rod (16) and a needle head (17); an air inlet cavity (181) and an air outlet cavity (182) are arranged in the handle (15); the air inlet cavity (181) is communicated with the air inlet tube (13), and the air outlet cavity (182) is communicated with the air outlet tube (14); The needle rod (16) comprises an outer tube (161), an inner tube (162), a cable protection tube (163) and a coaxial cable (164) which are sequentially sleeved from the outside to the inside; the air inlet channel (165) is formed between the inner tube (162) and the cable protection tube (163), and the air outlet channel (166) is formed between the outer tube (161) and the inner tube (162); the rear end of the air inlet channel (165) is connected to the air inlet cavity (181), and the rear end of the air outlet channel (166) is connected to the air outlet cavity (182); The needle (17) is sealed and inserted into the front end of the outer tube (161); an antenna (171) is arranged inside the needle (17); the inner conductor of the coaxial cable (164) extends into the interior of the antenna (171); a choke ring (167) is arranged inside the outer tube (161); the rear end of the choke ring (167) is sealed and inserted into the front end of the inner tube (162); the front end of the choke ring (167) is sealed against the insertion part of the needle (17); a connecting hole (168) is opened on the front end peripheral wall of the inner tube (162); the air inlet channel (165) and the air outlet channel (166) are connected through the connecting hole (168).

6. The air-cooled microwave ablation device according to claim 5, characterized in that: A connecting piece (18) is provided in the handle (15), and a stopper (183) is provided in the middle of the connecting piece (18), and the stopper (183) separates the inner cavity of the connecting piece (18) into the air inlet cavity (181) and the air outlet cavity (182); the outer tube (161) is sealed and inserted at the front end of the connecting piece (18) and communicates with the air inlet cavity (181); a through hole (184) is provided in the middle of the stopper (183), and the inner tube (162) is sealed and inserted in the through hole (184) and communicates with the air outlet cavity (182).

7. The air-cooled microwave ablation device according to claim 5, characterized in that: It also comprises a protective sleeve (19); the protective sleeve (19) is detachably connected to the front end of the handle (15).

8. The air-cooled microwave ablation device according to claim 7, characterized in that: The front end of the handle (15) is provided with an annular slot (151), and the rear end of the protective sleeve (19) is inserted into the annular slot (151).

9. An air-cooled microwave ablation device according to any one of claims 7 or 8, characterized in that: The protective sleeve (19) is provided with a silicone sleeve (191) for sleeved on the needle rod (16).

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