Air-cooling microwave ablation equipment

Abstract

The utility model 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 utility model relates to microwave ablation equipment technical field, concretely relates to a gas cooling microwave ablation equipment. BACKGROUND

[0002] Microwave ablation technology as an advanced medical treatment has been widely used in tumor treatment and other medical fields. Microwave ablation equipment emits microwave energy to target tissue, which generates heat effect, so as to achieve the purpose of ablation. This kind of equipment usually includes basic type without cooling system and advanced type with cooling system. In the equipment with cooling system, water cooling structure is widely used because of its high heat dissipation performance.

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

[0004] Oxidation problem: because water contacts with copper material in ablation needle structure, chemical reaction is easy to occur under long time effect, and copper oxide and other products are generated. These oxidation products not only affect the performance of ablation needle, such as conductivity and thermal conductivity, but also may have adverse effects on the stability and reliability of the equipment. In addition, oxidation reaction may also accelerate the corrosion of ablation needle and shorten its service life.

[0005] Water leakage risk: water cooling structure depends on a complex circulation system to maintain the flow and heat dissipation of water. However, once the circulation system leaks, it will have serious negative effects on the working ablation equipment and other medical equipment. Water leakage not only may cause the equipment to be wet, increase the risk of short circuit and electrical failure, but also may pose a threat to the safety of the operator.

[0006] Energy field disturbance: in the process of microwave ablation, the antenna of ablation needle is responsible for emitting microwave energy to form energy field. However, water in the circulation process will disturb the energy field. This disturbance may cause uneven energy distribution, affect the ablation effect and precision. INVENTION CONTENTS

[0007] The technical problem to be solved by the utility model is to provide a gas cooling microwave ablation equipment to overcome the above-mentioned deficiencies in the prior art.

[0008] The utility model discloses a kind of air-cooled microwave ablation equipment, including ablation needle and microwave ablation host;The coaxial cable and temperature measuring line of ablation needle are electrically connected with the microwave source control unit of microwave ablation host;Cooling gas control unit is provided in microwave ablation host, gas inlet passage and gas outlet passage are provided in ablation needle, gas inlet passage is communicated with the gas outlet end of cooling gas control unit by gas inlet pipe, gas outlet passage is communicated with the gas inlet end of cooling gas control unit by gas outlet pipe, the gas inlet end of cooling gas control unit is externally connected with gas tank or gas medium preparation device.

[0009] The utility model discloses beneficial effect is: inert gas medium is transported to equipment, gas medium is cooled by cooling gas control unit, then the cooled gas medium is sent into the gas inlet passage in the inside of ablation needle by gas inlet pipe and carries out cooling effect, after the action, gas is returned to cooling gas control unit and is cooled again by gas outlet passage, avoid the oxidation that copper in ablation needle structure piece reacts with water in traditional water cooling structure, eliminate the situation that cooling system appears water leakage, effectively protect ablation equipment, avoid the energy field that ablation needle launches and produce disturbance, and the circulation backflow cooling mode, reduce gas consumption.

[0010] Based on the above technical scheme, the utility model can also be improved as follows.

[0011] Further, the cooling gas control unit includes a cooling device, a cooling pipe, a backflow pipe, a pressure increasing valve, a one-way air valve and an electronic air valve.

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

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

[0014] Further, temperature sensors are arranged at the two ends of the cooling device.

[0015] Further, the gas outlet end of the pressure increasing valve is provided with a gas pressure detection module.

[0016] Further, the ablation needle includes a handle, a needle shaft and a needle head, the handle is provided with an air inlet cavity and an air outlet cavity, the air inlet cavity is communicated with the gas inlet pipe, and the air outlet cavity is communicated with the gas outlet pipe.

[0017] The needle shaft includes an outer tube, an inner tube, a cable protection tube and a coaxial cable which are sequentially sleeved from outside to inside, the air inlet passage is formed between the inner tube and the cable protection tube, and the air outlet passage is formed between the outer tube and the inner tube, the rear end of the air inlet passage is communicated with the air inlet cavity, and the rear end of the air outlet passage is communicated with the air outlet cavity.

[0018] The needle is sealingly inserted into the front end of the outer tube, an antenna is arranged in the needle, the inner conductor of the coaxial cable extends into the interior of the antenna, a choke ring is arranged in the outer tube, the rear end of the choke ring is sealingly inserted into the front end of the inner tube, the front end of the choke ring abuts against the insertion part of the needle, a through hole is formed in the peripheral wall of the front end of the inner tube, and the gas inlet channel and the gas outlet channel are communicated through the through hole.

[0019] Further, a connecting piece is arranged in the handle, a stopper is arranged in the middle of the connecting piece, the inner cavity of the connecting piece is separated into a gas inlet cavity and a gas outlet cavity by the stopper, the outer tube is sealingly inserted into the front end of the connecting piece and communicates with the gas inlet cavity, and the stopper is provided with a through hole, and the inner tube is sealingly inserted into the through hole and communicates with the gas outlet cavity.

[0020] Further, the utility model further comprises a protective sleeve, and the protective sleeve is detachably connected to the front end of the handle.

[0021] Further, the front end of the handle is provided with an annular insertion groove, and the rear end of the protective sleeve is inserted into the annular insertion groove.

[0022] Further, the protective sleeve is provided with a silica gel sleeve arranged on the needle rod. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the overall structure block diagram of the utility model;

[0024] Figure 2 It is the cooling gas control unit structure block diagram of the utility model;

[0025] Figure 3 It is the ablation needle structure schematic view of the utility model;

[0026] Figure 4 It is the ablation needle structure schematic view of the utility model; Figure 1 ;

[0027] Figure 5 It is the ablation needle structure schematic view of the utility model; Figure 2 ;

[0028] Figure 6 It is the ablation needle structure schematic view of the utility model; Figure 1 ;

[0029] Figure 7 It is the ablation needle structure schematic view of the utility model; Figure 2 ;

[0030] Figure 8 It is the ablation needle structure schematic view of the utility model; Figure 3 ;

[0031] Figure 9Enlarged partial cross-sectional structure of the ablation needle of this utility model Figure 4 .

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. Ablation needle; 12. Temperature measuring wire; 13. Inlet pipe; 14. Outlet pipe; 15. Handle; 151. Ring-shaped slot; 16. Needle bar; 161. Outer tube; 162. Inner tube; 163. Cable protection tube; 164. Coaxial cable; 165. Inlet channel; 166. Outlet channel; 167. Choke ring; 168. Connecting hole; 17. Needle tip; 171. Antenna; 18. Connector; 181. Inlet chamber; 182. Outlet chamber; 183. Stop 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 pipe; 223. Return pipe; 224. Pressure booster valve; 225. One-way gas valve; 226. Electronic gas valve. Detailed Implementation

[0034] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0035] like Figures 1-9 As shown in Embodiment 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 wire 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 provided inside the microwave ablation host 2. An air inlet channel 165 and an air outlet channel 166 are provided inside 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. 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 supplied to the equipment, and the gas medium is cooled by the cooling gas control unit 22. The cooled gas medium is then sent into the air inlet channel 165 inside the ablation needle 1 through the air inlet pipe 13 for further cooling. The cooled gas returns to the cooling gas control unit 22 through the air outlet channel 166 for further cooling. This avoids the oxidation caused by the reaction between water and copper in the ablation needle 1 structure in the traditional water-cooled structure, eliminates water leakage in the cooling system, effectively protects the ablation equipment, avoids disturbance to the energy field emitted by the ablation needle 1, and reduces gas consumption through the circulating cooling method.

[0037] In the embodiment, the gas medium is inert gas, such as helium, which is not easy to react with other substances, has no toxic effect on biology and environment, and has a specific heat capacity of 5190 J / (kg*℃) which is greater than that of water 4200 J / (kg*℃), so it can be used as a cooling medium and can be recycled.

[0038] Embodiment 2, this embodiment is a further improvement based on embodiment 1, which is as follows:

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

[0040] The electronic air valve 226, the cooling device 221 and the pressure increasing valve 224 are sequentially arranged on the cooling pipe 222 along the air flow direction, the air inlet end of the electronic air valve 226 is connected with a gas tank or a gas medium preparation device, the air outlet end of the return pipe 223 is connected to the cooling pipe 222 and located between the cooling device 221 and the electronic air valve 226, and the one-way air 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 the gas tank or the cooling gas preparation device, enters the cooling pipe 222 after passing through the electronic air valve 226, the electronic air valve 226 is closed after the cooling pipe 222 is filled with the gas medium, the gas medium is cooled by the cooling device 221, the temperature of the gas medium is increased by the pressure increasing valve 224 after cooling, and the cooled gas medium is sent into the air inlet pipe 13 to cool the ablation needle 1, the high-temperature gas medium discharged from the air outlet pipe 14 is returned to the cooling device 221 for cooling again through the one-way air valve 225, and the gas medium is recycled and used, so that the gas consumption is greatly reduced.

[0043] Embodiment 3, this embodiment is a further improvement based on embodiment 2, which is as follows:

[0044] Temperature sensors are arranged at both ends of the cooling device 221. The temperatures before and after cooling can be monitored in real time, so as to adjust the cooling device 221 according to the actual situation.

[0045] Embodiment 4, this embodiment is a further improvement based on embodiment 2, which is as follows:

[0046] A gas pressure detection module is arranged at the air outlet end of the pressure increasing valve 224. The gas pressure in the cooling pipe 222 can be monitored in real time, if the gas pressure is insufficient, the electronic air valve 226 is opened to supplement the gas medium.

[0047] Embodiment 5, this embodiment is a further improvement on the basis of any one of embodiments 2 to 4, which is specifically as follows:

[0048] The ablation needle 1 comprises a handle 15, a needle rod 16 and a needle head 17; the handle 15 is provided with an air inlet cavity 181 and an air outlet cavity 182, the air inlet cavity 181 is communicated with the air inlet pipe 13, and the air outlet cavity 182 is communicated with the air outlet pipe 14;

[0049] 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 outside to inside; the air inlet passage 165 is formed between the inner tube 162 and the cable protection tube 163, and the air outlet passage 166 is formed between the outer tube 161 and the inner tube 162; the rear end of the air inlet passage 165 is communicated with the air inlet cavity 181, and the rear end of the air outlet passage 166 is communicated with the air outlet cavity 182;

[0050] The needle head 17 is sealingly inserted into the front end of the outer tube 161, the needle head 17 is provided with an antenna 171, the inner conductor of the coaxial cable 164 extends into the inside of the antenna 171, the outer tube 161 is provided with a choke ring 167, the rear end of the choke ring 167 is sealingly inserted into the front end of the inner tube 162, the front end of the choke ring 167 is sealingly abutted with the insertion part of the needle head 17, the front end of the inner tube 162 is provided with a communication hole 168, and the air inlet passage 165 and the air outlet passage 166 are communicated through the communication hole 168.

[0051] After the cooled gas medium enters into the air inlet cavity 181, the gas medium enters into the air inlet passage 165 between the inner tube 162 and the cable protection tube 163 to cool the coaxial cable 164, and then the cooled gas medium enters into the air outlet passage 166 through the communication hole 168, and then enters into the cooling pipe 222 through the air outlet cavity 182, the air outlet pipe 14 and the return pipe 223, and then is cooled again by the cooling device 221, so that the cooling effect is better and the gas consumption is greatly saved.

[0052] In specific implementation, the antenna 171 is made of copper alloy, the antenna 171 made of copper alloy has good electric conductivity and heat conductivity and low processing difficulty; in addition, the needle head 173 is made of zirconia ceramic, the needle head 17 made of zirconia ceramic has high temperature resistance, high strength and high relative dielectric constant.

[0053] Embodiment 6, this embodiment is a further improvement on the basis of embodiment 5, which is specifically as follows:

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

[0055] Embodiment 7, this embodiment is a further improvement based on embodiment 5, which is as follows:

[0056] It also includes a protective sleeve 19; 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, avoid damage to the needle 17 due to impact and bumping before use, and also avoid piercing the sealed bag before use.

[0057] Embodiment 8, this embodiment is a further improvement based on embodiment 7, which is as follows:

[0058] The front end of the handle 15 is provided with an annular insertion slot 151, and the rear end of the protective sleeve 19 is inserted into the annular insertion slot 151. The detachable arrangement of the protective sleeve 19 and the handle 15 is achieved, 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, which is as follows:

[0060] The protective sleeve 19 is provided with a silica gel sleeve 191 for sleeving on the needle rod 16. The silica gel sleeve 191 can avoid loosening and bending of the needle rod 16 caused by shaking during transportation.

[0061] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and those skilled in the art can change, modify, replace and modify the above-mentioned embodiments within the scope of the utility model.

Claims

1. A gas-cooled microwave ablation device, characterized by, The application relates to a microwave ablation needle and a microwave ablation host machine; a coaxial cable (164) and a temperature measuring wire (12) of the microwave ablation needle (1) are electrically connected with a microwave source control unit (21) of the microwave ablation host machine (2); a cooling gas control unit (22) is arranged in the microwave ablation host machine (2), an air inlet channel (165) and an air outlet channel (166) are arranged in the microwave ablation needle (1), the air inlet channel (165) is communicated with an air outlet end of the cooling gas control unit (22) through an air inlet pipe (13), the air outlet channel (166) is communicated with an 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 with a gas tank or a gas medium preparation device.

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

3. A gas-cooled microwave ablation device according to claim 2, wherein, Temperature sensors are arranged at the two ends of the cooling device (221).

4. The gas-cooled microwave ablation device of claim 2, wherein, An air pressure detection module is arranged at the air outlet end of the pressure boosting valve (224).

5. A gas-cooled microwave ablation device according to any one of claims 2 to 4, wherein, The microwave 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 pipe (13), and the air outlet cavity (182) is communicated with the air outlet pipe (14); The needle rod (16) comprises an outer pipe (161), an inner pipe (162), a cable protection pipe (163) and a coaxial cable (164) which are sequentially arranged from outside to inside; the air inlet channel (165) is formed between the inner pipe (162) and the cable protection pipe (163), and the air outlet channel (166) is formed between the outer pipe (161) and the inner pipe (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). The needle (17) is sealingly inserted into the front end of the outer tube (161), an antenna (171) is arranged in 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 sealingly inserted into the front end of the inner tube (162), the front end of the choke ring (167) sealingly abuts the insertion part of the needle (17), the front end of the inner tube (162) is provided with a through hole (168), and the air inlet channel (165) and the air outlet channel (166) are communicated through the through hole (168).

6. A gas-cooled microwave ablation device according to claim 5, wherein, The handle (15) is provided with a connecting piece (18), the middle part of the connecting piece (18) is provided with a stop block (183), the stop block (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 sealingly inserted into the front end of the connecting piece (18) and communicates with the air inlet cavity (181), the middle part of the stop block (183) is provided with a through hole (184), and the inner tube (162) is sealingly inserted into the through hole (184) and communicates with the air outlet cavity (182).

7. The gas-cooled microwave ablation device of claim 5, wherein, A protective sleeve (19) is further included; the protective sleeve (19) is detachably connected to the front end of the handle (15).

8. A gas-cooled microwave ablation device according to claim 7, wherein, The front end of the handle (15) is provided with an annular insertion slot (151), and the rear end of the protective sleeve (19) is inserted into the annular insertion slot (151).

9. A gas-cooled microwave ablation device according to any one of claims 7 or 8, wherein, The protective sleeve (19) is provided with a silica gel sleeve (191) for sleeving on the needle rod (16).

Images