Full-needle water-cooled microwave ablation needle

Abstract

The utility model relates to a full-needle water-cooling microwave ablation needle which comprises a handle, a needle rod and a needle head connected to the front end of the needle rod. The needle rod comprises an outer tube, an inner tube and a coaxial cable which are coaxially arranged from outside to inside, the inner tube comprises a capillary tube and a water conduit which are sequentially arranged along the extension direction of the needle rod, and the capillary tube is hermetically connected with the water conduit through a choke ring; the front end of the water conduit extends into the inner front end of the needle, a microwave antenna is arranged in the needle, an inner conductor of the coaxial cable is connected with the microwave antenna, and the water inlet channel and the water return channel are communicated at the inner front end of the needle. The external water supply mechanism pumps normal saline into the water inlet channel, the normal saline enters the needle from the water inlet channel to cool a radiation area, then the normal saline flows back into the water return channel from the front end in the needle, and then the normal saline is discharged through the external water discharge mechanism. Normal saline flows through the whole needle rod and the needle head, so that the cooling effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave ablation equipment, in particular to a microwave ablation needle with full needle water cooling. Background Art

[0002] In the medical field, microwave ablation technology is widely used in the treatment of tumors, cardiovascular diseases and many other diseases. As the main application tool of this technology, microwave ablation needle can destroy the diseased tissue by generating high temperature, thereby achieving the purpose of treatment. However, during microwave ablation, high temperature will not only affect the diseased tissue, but also cause thermal damage to the ablation needle itself and surrounding healthy tissue.

[0003] In order to reduce this thermal damage, the commonly used method is to introduce a water cooling system inside the ablation needle. The design of this water-cooled microwave ablation needle is to insert a water cooling tube inside the needle shaft. However, this design has several obvious problems:

[0004] Poor cooling effect: Since the water cooling tube is inserted into the needle rod, it cannot completely wrap the coaxial cable. This means that part of the coaxial cable is still exposed to the high temperature environment, resulting in poor cooling effect.

[0005] Increased needle shaft diameter: Inserting a water-cooling tube will increase the diameter of the needle shaft, which not only makes it more difficult to insert the ablation needle into the diseased tissue, but may also increase the risk of damage to surrounding healthy tissue.

[0006] For the above problems, the current solution is: the needle rod includes a circulating water outlet pipe, a needle tube, and a cable protection tube which are sequentially arranged from the outside to the inside; a water inlet channel is formed between the needle tube and the cable protection tube, and a return water channel is formed between the circulating water outlet pipe and the needle tube; the front end of the water inlet channel is connected with the front end of the return water channel; the rear end of the water inlet channel is connected with the water inlet chamber, and the rear end of the return water channel is connected with the water outlet chamber; a choke ring is arranged in the circulating water outlet pipe, and the rear end of the choke ring is sealingly inserted in the front end of the needle tube, the front end of the choke ring is sealed against the insertion part of the needle, and a return water port is opened on the front end peripheral wall of the needle tube.

[0007] However, the above solution still has defects that can be optimized. For example, after the normal saline enters the water inlet channel, it flows back to the water return channel from the water return port at the front end of the needle tube. Due to the sealing setting of the choke ring, the normal saline cannot enter the inside of the needle, and the cooling effect is poor. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide a microwave ablation needle with full needle water cooling, so as to overcome the deficiencies in the above-mentioned prior art.

[0009] The utility model solves the above technical problems with the following technical solutions: a fully water-cooled microwave ablation needle, comprising a handle, a needle rod and a needle head connected to the front end of the needle rod; the needle rod comprises an outer tube, an inner tube and a coaxial cable arranged coaxially from outside to inside, the inner tube comprises a capillary tube and a water guide tube arranged in sequence along the extension direction of the needle rod, and the capillary tube and the water guide tube are sealed and connected via a choke ring;

[0010] A water inlet channel is formed between the inner tube and the coaxial cable, a water return channel is formed between the outer tube and the inner tube, the water inlet channel is connected to an external water supply mechanism, and the water return channel is connected to an external drainage mechanism;

[0011] The front end of the water guide tube extends into the inner front end of the needle, a microwave antenna is arranged inside the needle, the inner conductor of the coaxial cable is connected to the microwave antenna, the water inlet channel and the water return channel are connected at the inner front end of the needle; the coaxial cable is externally connected to the microwave ablation device host.

[0012] The beneficial effects of the utility model are as follows: the external water supply mechanism pumps physiological saline into the water inlet channel, the physiological saline enters the inside of the needle from the water inlet channel, cools the radiation area, then flows back into the return water channel from the front end of the needle, and is discharged by the external drainage mechanism; the flow direction of the physiological saline runs through the entire needle rod and the needle, and the cooling effect is better; in addition, the double-layer wrapped circulating water cooling of the water inlet channel and the return water channel replaces the traditional method of adding a water cooling pipe inside the needle rod, and the cooling effect is better, and there is no need to build a water cooling pipe into the needle rod, and there is no need to increase the diameter of the needle rod.

[0013] On the basis of the above technical solution, the present invention can also be improved as follows.

[0014] Furthermore, a water inlet chamber and a water outlet chamber are provided in the handle, the rear end of the water inlet channel is connected to the water inlet chamber, and the rear end of the return water channel is connected to the water outlet chamber. The water inlet chamber is connected to a water inlet joint, which is connected to an external water supply mechanism, and the water outlet chamber is connected to a water outlet joint. A cable joint is provided at the bottom of the handle, which is connected to the microwave ablation device host through a cable.

[0015] Furthermore, it also includes an inlet and outlet water connection piece arranged in the handle, a block is arranged in the middle of the inlet and outlet water connection piece, and the block separates the inner cavity of the inlet and outlet water connection piece into an inlet cavity and an outlet cavity; the outer tube seal is inserted in the front end of the inlet and outlet water connection piece and communicates with the outlet cavity; a through hole is arranged in the middle of the block, and the inner tube seal is inserted in the through hole and communicates with the inlet cavity.

[0016] Furthermore, the capillary tube and the water guide pipe are respectively plugged or sleeved on the two ends of the choke ring.

[0017] Furthermore, the water diversion pipe is made of PI material.

[0018] Furthermore, it also includes a protective sleeve; the protective sleeve is detachably connected to the front end of the handle.

[0019] 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.

[0020] Furthermore, a silicone sleeve for sleeved on the needle rod is arranged in the protective sleeve.

[0021] Furthermore, the needle is made of ceramic.

[0022] Furthermore, a temperature sensor is provided in the handle, the temperature sensor is fitted with the needle rod, and the temperature sensor is connected to the microwave ablation device host through a cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The schematic diagram of the local cross-sectional structure of the needle bar of the utility model Figure 1 ;

[0024] Figure 2 The schematic diagram of the local cross-sectional structure of the needle bar of the utility model Figure 2 ;

[0025] Figure 3 The schematic diagram of the local cross-sectional structure of the needle bar of the utility model Figure 3 ;

[0026] Figure 4 This is a schematic diagram of the cross-sectional structure of the water inlet and outlet connector of the utility model;

[0027] Figure 5 This is a schematic diagram of a partial cross-sectional structure of a handle of the utility model;

[0028] Figure 6 It is a schematic diagram of the overall structure of the utility model.

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1. Handle; 11. Water inlet and outlet connectors; 111. Water inlet chamber; 112. Water outlet chamber; 12. Block; 13. Water inlet connector; 14. Water outlet connector; 15. Cable connector; 16. Annular slot; 2. Needle rod; 21. Outer tube; 22. Inner tube; 2121. Water return channel; 221. Capillary tube; 222. Water diversion pipe; 23. Coaxial cable; 2231. Water inlet channel; 24. Choke ring; 3. Needle; 31. Microwave antenna; 4. Protective sleeve; 5. Silicone sleeve; 6. Temperature sensor. DETAILED DESCRIPTION

[0031] 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.

[0032] like Figure 1 to Figure 6As shown, in Example 1, a fully water-cooled microwave ablation needle comprises a handle 1, a needle shaft 2 and a needle head 3 connected to the front end of the needle shaft 2; the needle shaft 2 comprises an outer tube 21, an inner tube 22 and a coaxial cable 23 arranged coaxially from outside to inside, the inner tube 22 comprises a capillary 221 and a water guide tube 222 arranged in sequence along the extension direction of the needle shaft 2, and the capillary 221 and the water guide tube 222 are sealed and connected via a choke ring 24;

[0033] A water inlet channel 2231 is formed between the inner tube 22 and the coaxial cable 23, and a water return channel 2121 is formed between the outer tube 21 and the inner tube 22. The water inlet channel 2231 is connected to an external water supply mechanism, and the water return channel 2121 is connected to an external drainage mechanism.

[0034] The front end of the water guide tube 222 extends into the inner front end of the needle 3. A microwave antenna 31 is arranged inside the needle 3. The inner conductor of the coaxial cable 23 is connected to the microwave antenna 31. The water inlet channel 2231 and the water return channel 2121 are connected at the inner front end of the needle 3. The coaxial cable 23 is externally connected to the microwave ablation device host.

[0035] The external water supply mechanism pumps the saline solution into the water inlet channel 2231, and the saline solution enters the inside of the needle 3 from the water inlet channel 2231 to cool the radiation area, and then flows back into the return water channel 2121 from the front end of the needle 3, and is then discharged by the external drainage mechanism; the flow direction of the saline solution runs through the entire needle rod 2 and the needle 3, and the cooling effect is better;

[0036] In addition, the double-layer wrapped circulating water cooling through the water inlet channel 2231 and the return water channel 2121 replaces the traditional method of adding a water cooling pipe inside the needle rod 2, which has a better cooling effect. There is no need to build a water cooling pipe into the needle rod 2, and there is no need to increase the diameter of the needle rod 2.

[0037] In a specific implementation, the needle 3 is detachably sealed and plugged into the front end of the outer tube 21, which is easy to assemble during the production process.

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

[0039] A water inlet chamber 111 and a water outlet chamber 112 are provided in the handle 1. The rear end of the water inlet channel 2231 is connected to the water inlet chamber 111, and the rear end of the return water channel 2121 is connected to the water outlet chamber 112. The water inlet chamber 111 is connected to a water inlet connector 13, which is connected to an external water supply mechanism. The water outlet chamber 112 is connected to a water outlet connector 14. A cable connector 15 is provided at the bottom of the handle 1, and the cable connector 15 is connected to the main unit of the microwave ablation device through a cable.

[0040] In the specific implementation, the external water supply mechanism is a water tank and a peristaltic pump; the water outlet of the water tank is connected to the water inlet connector 13 through an inlet hose, the water outlet connector 14 is connected to the water tank through an outlet hose, and the peristaltic pump is arranged in the middle of the inlet hose.

[0041] Embodiment 3, this embodiment is a further improvement on the basis of embodiment 2, and its details are as follows:

[0042] It also includes a water inlet and outlet connector 11 disposed in the handle 1, a stopper 12 is disposed in the middle of the water inlet and outlet connector 11, and the stopper 12 separates the inner cavity of the water inlet and outlet connector 11 into a water inlet cavity 111 and a water outlet cavity 112; an outer tube 21 is sealed and plugged into the front end of the water inlet and outlet connector 11, and communicates with the water outlet cavity 112; a through hole is disposed in the middle of the stopper 12, and an inner tube 22 is sealed and plugged into the through hole, and communicates with the water inlet cavity 111. It is easier to process and assemble, and has a better sealing effect.

[0043] Embodiment 4: This embodiment is a further improvement on the basis of embodiment 1, and its details are as follows:

[0044] The capillary tube 221 and the water guide tube 222 are respectively plugged or sleeved on the two ends of the choke ring 24, so as to facilitate assembly in the production process.

[0045] Embodiment 5, this embodiment is a further improvement on the basis of embodiment 1, and its details are as follows:

[0046] The water guide tube 222 is made of PI material, which is resistant to high temperatures and corrosion, and can ensure that the water guide tube 222 does not soften or deform at high temperatures during microwave ablation.

[0047] Embodiment 6: This embodiment is a further improvement on the basis of embodiment 1, and its details are as follows:

[0048] The protective sleeve 4 is detachably connected to the front end of the handle 1. The protective sleeve 4 can effectively protect the needle 3 to prevent the needle 3 from being damaged by collision or knock before use, and can also prevent the needle 3 from piercing the sealed bag before use.

[0049] Embodiment 7, this embodiment is a further improvement on the basis of embodiment 6, and its details are as follows:

[0050] The front end of the handle 1 is provided with an annular slot 16, and the rear end of the protective sleeve 4 is inserted into the annular slot 16. The protective sleeve 4 and the handle 1 are detachably arranged, and the disassembly and installation are convenient.

[0051] Embodiment 8: This embodiment is a further improvement based on any one of Embodiments 6 or 7, and its details are as follows:

[0052] A silicone sleeve 5 for sleeved on the needle bar 2 is arranged in the protective sleeve 4. The silicone sleeve 5 can prevent the needle bar 2 from loosening and bending due to shaking during transportation.

[0053] Embodiment 9: This embodiment is a further improvement on the basis of embodiment 1, and its details are as follows:

[0054] The needle 3 is made of ceramic material. The needle 3 made of ceramic material has high temperature resistance, high strength and high relative dielectric constant.

[0055] Embodiment 10: This embodiment is a further improvement on the basis of Embodiment 1, and its details are as follows:

[0056] A temperature sensor 6 is provided in the handle 1, and the temperature sensor 6 is attached to the needle rod 2. The temperature sensor 6 is connected to the microwave ablation device host through a cable. The temperature of the needle rod 2 is monitored in real time by the temperature sensor 6, so that the doctor can grasp the heating condition of the needle rod 2 in real time during the operation, and then adjust the speed of the water cooling cycle according to the demand.

[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A fully water-cooled microwave ablation needle, characterized in that: The invention comprises a handle (1), a needle rod (2) and a needle head (3) connected to the front end of the needle rod (2); the needle rod (2) comprises an outer tube (21), an inner tube (22) and a coaxial cable (23) arranged coaxially from outside to inside, the inner tube (22) comprises a capillary tube (221) and a water guide tube (222) arranged in sequence along the extension direction of the needle rod (2), and the capillary tube (221) and the water guide tube (222) are sealed and connected via a choke ring (24); A water inlet channel (2231) is formed between the inner tube (22) and the coaxial cable (23), and a water return channel (2121) is formed between the outer tube (21) and the inner tube (22); the water inlet channel (2231) is connected to an external water supply mechanism, and the water return channel (2121) is connected to an external drainage mechanism; The front end of the water guide tube (222) extends into the inner front end of the needle (3); a microwave antenna (31) is arranged inside the needle (3); the inner conductor of the coaxial cable (23) is connected to the microwave antenna (31); the water inlet channel (2231) and the water return channel (2121) are connected at the inner front end of the needle (3); the coaxial cable (23) is externally connected to a main unit of a microwave ablation device.

2. The fully water-cooled microwave ablation needle according to claim 1, characterized in that: The handle (1) is provided with a water inlet chamber (111) and a water outlet chamber (112); the rear end of the water inlet channel (2231) is in communication with the water inlet chamber (111); the rear end of the water return channel (2121) is in communication with the water outlet chamber (112); the water inlet chamber (111) is connected to a water inlet connector (13); the water inlet connector (13) is connected to an external water supply mechanism; the water outlet chamber (112) is connected to a water outlet connector (14); a cable connector (15) is provided at the bottom of the handle (1); the cable connector (15) is connected to a main unit of the microwave ablation device via a cable.

3. The fully water-cooled microwave ablation needle according to claim 2, characterized in that: It also comprises a water inlet and outlet connection piece (11) arranged in the handle (1), a block (12) being arranged in the middle of the water inlet and outlet connection piece (11), the block (12) separating the inner cavity of the water inlet and outlet connection piece (11) into the water inlet cavity (111) and the water outlet cavity (112); the outer tube (21) is sealingly inserted at the front end of the water inlet and outlet connection piece (11) and communicates with the water outlet cavity (112); a through hole is arranged in the middle of the block (12), the inner tube (22) is sealingly inserted in the through hole and communicates with the water inlet cavity (111).

4. The fully water-cooled microwave ablation needle according to claim 1, characterized in that: The capillary tube (221) and the water guide pipe (222) are respectively plugged into or sleeved on the two ends of the choke ring (24).

5. The fully water-cooled microwave ablation needle according to claim 1, characterized in that: The water diversion pipe (222) is made of PI material.

6. The fully water-cooled microwave ablation needle according to claim 1, characterized in that: It also comprises a protective sleeve (4); the protective sleeve (4) is detachably connected to the front end of the handle (1).

7. The fully water-cooled microwave ablation needle according to claim 6, characterized in that: The front end of the handle (1) is provided with an annular slot (16), and the rear end of the protective sleeve (4) is inserted into the annular slot (16).

8. A fully water-cooled microwave ablation needle according to any one of claims 6 or 7, characterized in that: A silicone sleeve (5) is provided inside the protective sleeve (4) and is used for sleeved on the needle rod (2).

9. The fully water-cooled microwave ablation needle according to claim 1, characterized in that: The needle (3) is made of ceramic material.

10. The fully water-cooled microwave ablation needle according to claim 1, characterized in that: A temperature sensor (6) is arranged in the handle (1), the temperature sensor (6) is in contact with the needle rod (2), and the temperature sensor (6) is connected to the main unit of the microwave ablation device via a cable.

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