Microwave ablation needle capable of dynamically measuring temperature

Abstract

The invention relates to a microwave ablation needle capable of dynamically measuring temperature, and belongs to the technical field of medical instruments. The microwave ablation needle comprises a needle head, a needle rod, a metal outer sleeve and an ablation needle handle, the two ends of the needle rod are fixedly connected with the ablation needle handle and the needle head respectively, and the metal outer sleeve is located on the outer side of the needle rod; the outer side of the metal outer sleeve is provided with a double-layer outer sleeve composed of a first elastic outer sleeve and a second elastic outer sleeve, the double-layer outer sleeve is tightly attached to the metal outer sleeve, and a temperature measuring element is arranged between the first elastic outer sleeve and the second elastic outer sleeve. A movable handle fixedly connected with the double-layer outer sleeve is arranged at the end, close to the ablation needle handle, of the needle rod. According to the invention, real-time temperature monitoring can be carried out on an actual ablation area target spot clinically, and the effectiveness and safety of interventional ablation are confirmed, so that the requirement of precise microwave ablation is met.

Description

Technical Field

[0001] The invention relates to a microwave ablation needle for dynamic temperature measurement, belonging to the technical field of medical devices. Background Art

[0002] Microwave ablation needles are mainly used for interventional ablation of solid tumors in the human body, and their indications include a variety of solid tumors such as lung, liver, thyroid, breast, uterine fibroids, etc. When using the microwave ablation needle, the ablation needle is inserted into the tumor, and the microwaves are used to quickly heat the diseased tissue to above 60°C, causing the tumor cell proteins to denature and necrotize, thereby inactivating the tumor cells and achieving a therapeutic effect.

[0003] The existing microwave ablation needle cannot confirm the actual tumor ablation size during actual tumor ablation. Therefore, the ablation size is usually estimated based on in vitro reference data and some simulation data. The operation needs to be suspended several times during the operation to confirm whether the tumor ablation is completed through medical imaging, which increases the procedure time. Moreover, medical imaging is not completely accurate, because the application principles of ultrasound, CT, and MRI are different, and the media of tumors are also different, resulting in accurate microwave ablation always being a pain point in clinical applications.

[0004] Precision microwave ablation requires that the temperature of human tissues from the inside of the tumor to the tumor's safety boundary should exceed 60 degrees, so that the tumor cells undergo irreversible coagulation necrosis. However, according to the applicant's understanding, the current microwave ablation needle can only measure temperature at a single point. When the ablation needle punctures the inside of the tumor for ablation, the position of the temperature measurement point and the tumor is relatively fixed, and it is impossible to ensure that the temperature from the inside of the tumor to the tumor's safety boundary reaches the required temperature. Therefore, it cannot meet the requirements of precision microwave ablation and has low safety, that is, there may be defects such as incomplete tumor ablation or causing the temperature of normal tissue to exceed 60 degrees, thereby damaging normal tissue. Summary of the invention

[0005] The technical problem to be solved by the present invention is to propose a mobile temperature-measuring microwave ablation needle that can perform real-time temperature monitoring of the actual ablation zone target in clinical practice, thereby confirming the effectiveness and safety of interventional ablation and meeting the requirements of precise microwave ablation.

[0006] In order to solve the above technical problems, the present invention provides a microwave ablation needle with dynamic temperature measurement, comprising a needle head, a needle rod, a metal outer sleeve and an ablation needle handle, wherein the two ends of the needle rod are respectively fixed to the ablation needle handle and the needle head, and the metal outer sleeve is located outside the needle rod; A double-layer outer sleeve consisting of a first elastic outer sleeve and a second elastic outer sleeve is disposed on the outer side of the metal outer sleeve, the double-layer outer sleeve is tightly attached to the metal outer sleeve, a temperature measuring element and a wire connecting the temperature measuring element are disposed between the first elastic outer sleeve and the second elastic outer sleeve, the temperature measuring element is disposed close to the needle head, and the wire extends along the length direction of the needle shaft to the ablation needle handle; A movable handle fixedly connected to the double-layer outer sleeve is provided at one end of the needle rod close to the ablation needle handle. Driven by the movable handle, the double-layer outer sleeve has a first state in which the position is relatively fixed with the metal outer sleeve, and a second state in which it slides along the metal outer sleeve.

[0007] The working principle of the present invention is as follows: after preoperative surgical planning, the target point for target ablation is set, and real-time temperature measurement is performed to confirm whether the ablation temperature of the target area reaches 60°C. According to needs, driven by the mobile handle, the target point is moved in real time for temperature measurement, that is, the temperature measuring element moves from the initial position along the metal outer sleeve to measure the temperature at different positions in the lesion, and the emission power of the ablation needle is adjusted in real time according to the measurement results to ensure complete ablation of the tumor and avoid damage to normal tissues, thereby improving the accuracy, effectiveness and safety of ablation.

[0008] When the present invention is in use, it measures the temperature of different positions in the lesion through mobile temperature measurement during the ablation process, thereby adjusting the emission power of the ablation needle in real time, which can achieve precise ablation. In addition, by measuring the real-time temperature of the target point and assisting in image testing, it can reduce multiple image scanning confirmations in clinical practice and improve the efficiency of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0010] Figure 2 yes Figure 1 An enlarged schematic diagram of the double-layer outer casing.

[0011] Figure numerals: 1. ablation needle tip; 2. temperature measuring element; 3. cooling capillary; 4. coaxial cable; 5. double-layer outer sleeve; 6. metal outer sleeve; 7. positioning column; 8. movable handle; 9. scale mark; 10. cooling water tank; 11. microwave connector; 12. ablation needle handle; 13. water inlet and outlet pipes. DETAILED DESCRIPTION

[0012] This embodiment relates to a microwave ablation needle with dynamic temperature measurement, such as Figure 1As shown, it includes a needle, a needle rod, a metal outer sleeve and an ablation needle handle. The two ends of the needle rod are respectively fixed to the ablation needle handle and the needle, and the metal outer sleeve is located outside the needle rod. The microwave ablation needle usually also includes a transmitting antenna, a coaxial cable, a cooling capillary and other necessary structures. The coaxial cable transmits the microwaves generated by the microwave generator to the transmitting antenna, and cools down the temperature through the cooling capillary. The above are all existing technologies, and reference can be made to relevant literature.

[0013] like Figure 1 and Figure 2 As shown, the outer side of the metal outer sleeve in this embodiment is provided with a double-layer outer sleeve consisting of a first elastic outer sleeve and a second elastic outer sleeve, the double-layer outer sleeve is close to the metal outer sleeve, a temperature measuring element and a wire connecting the temperature measuring element are provided between the first elastic outer sleeve and the second elastic outer sleeve, the temperature measuring element is arranged close to the needle head, and the wire extends along the length direction of the needle rod to the ablation needle handle. The temperature measuring element preferably adopts a thermocouple, and the thermocouple can be fixed between the first elastic outer sleeve and the second elastic outer sleeve by double-layer coated thermocouple technology to achieve 4000V voltage internal insulation. The ablation needle handle is provided with an interface for connecting the wire, which is used to read the temperature measurement value of the thermocouple in real time.

[0014] The first elastic outer sleeve and the second elastic outer sleeve can be made of medical polymer materials. In the present embodiment, they are preferably made of polyimide (POLYIMIDE), which is customarily referred to as PI. It is a type of polymer material with good biocompatibility and stability. It can maintain the stability of its structure and performance at high temperatures, has very good electrical insulation, and high mechanical properties such as tensile strength, bending strength and impact strength.

[0015] A movable handle fixedly connected to the double-layer outer sleeve is provided at one end of the needle rod close to the ablation needle handle. Driven by the movable handle, the double-layer outer sleeve has a first state in which the position is relatively fixed with the metal outer sleeve, and a second state in which it slides along the metal outer sleeve.

[0016] This embodiment can also be improved as follows: 1) For the convenience of operation, in this embodiment, the movable handle is mounted on a metal outer sleeve. Preferably, in order to improve the movement accuracy of the movable handle, a scale mark for displaying the movement distance of the movable handle is provided on the metal outer sleeve.

[0017] 2) In order to prevent the thermocouple from being too close to the needle, a positioning column for limiting the movable handle is provided on the metal outer sleeve, and the movable handle can only move from the positioning column to the direction of the ablation needle handle. In order to overcome the influence of the positioning column on the sliding of the double-layer outer sleeve along the metal outer sleeve, a strip-shaped hollow matching the position and size of the positioning column is provided on the double-layer outer sleeve, and the positioning column passes through the hollow. When the movable handle moves toward the direction of the ablation needle handle, the strip-shaped hollow provides a space for the positioning column to pass through.

[0018] When using this embodiment, the target ablation point is set after preoperative surgical planning, and real-time temperature measurement is performed to confirm whether the ablation temperature of the target area reaches 60°C. As needed, driven by the movable handle, the temperature measuring element moves from the initial position along the metal outer sleeve to measure the temperature at different positions in the lesion, and the transmission power of the ablation antenna is adjusted according to the measurement results to ensure complete ablation of the tumor, avoid damage to normal tissue, and improve the effectiveness and safety of ablation.

Claims

1. A microwave ablation needle with dynamic temperature measurement, comprising a needle head, a needle rod, a metal outer sleeve and an ablation needle handle, wherein the two ends of the needle rod are respectively fixed to the ablation needle handle and the needle head, and the metal outer sleeve is located outside the needle rod; characterized in that: A double-layer outer sleeve consisting of a first elastic outer sleeve and a second elastic outer sleeve is disposed on the outer side of the metal outer sleeve, the double-layer outer sleeve is tightly attached to the metal outer sleeve, a temperature measuring element and a wire connecting the temperature measuring element are disposed between the first elastic outer sleeve and the second elastic outer sleeve, the temperature measuring element is disposed close to the needle head, and the wire extends along the length direction of the needle shaft to the ablation needle handle; A movable handle fixedly connected to the double-layer outer sleeve is provided at one end of the needle rod close to the ablation needle handle. Driven by the movable handle, the double-layer outer sleeve has a first state in which the position is relatively fixed with the metal outer sleeve, and a second state in which it slides along the metal outer sleeve.

2. The microwave ablation needle with dynamic temperature measurement according to claim 1, characterized in that: The movable handle is sleeved on the metal outer sleeve.

3. The microwave ablation needle with dynamic temperature measurement according to claim 2, characterized in that: The metal outer sleeve is provided with a scale mark for displaying the moving distance of the movable handle.

4. The microwave ablation needle with dynamic temperature measurement according to claim 2 or 3, characterized in that: The metal outer sleeve is provided with a positioning column for limiting the movable handle.

5. The microwave ablation needle with dynamic temperature measurement according to claim 4, characterized in that: The double-layer outer sleeve is provided with a strip-shaped hollow that matches the position and size of the positioning column, and the positioning column passes through the hollow.

6. The microwave ablation needle with dynamic temperature measurement according to claim 1, characterized in that: The first elastic outer sleeve and the second elastic outer sleeve are both made of polyimide material.

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