A microwave ablation needle

Abstract

The utility model discloses a kind of microwave ablation needles, it is related to medical instrument technical field;To solve the problem that existing microwave ablation needle is used, coaxial cable for transmitting microwave energy is higher in heat when working, cannot be cooled better heat dissipation, carbonization of tissue is serious in ablation process, the following technical scheme is proposed: a kind of microwave ablation needle, including outer needle tube, needle head, antenna terminal, coaxial cable, needle head is fixed with outer needle tube by screw thread connection mode, outer needle tube is hollow circular tube structure, inside is provided with water channel and antenna terminal, water channel includes first pipeline and second pipeline, after first pipeline and second pipeline are connected and fixed, it is set with the outside of coaxial cable.This utility model can effectively carry out microwave ablation treatment, reduce needle head temperature when using, monitor temperature change in real time.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a microwave ablation needle. Background Technology

[0002] Microwave ablation is a technique that uses microwave energy to generate a thermal effect to treat tumor tissue. It has been widely used in the treatment of various cancers, including liver cancer and lung cancer. The microwave ablation needle, as the core instrument in microwave ablation technology, directly affects the treatment efficacy and safety.

[0003] At present, the basic structure of microwave ablation needles usually includes a needle tube, a needle tip, a coaxial cable, and an antenna. For example, a single-sided microwave ablation needle disclosed in CN108030549B includes an ablation needle tube and an ablation needle tip. A microwave coaxial cable is provided inside the ablation needle tube, and an antenna is provided inside the ablation needle tip. The microwave coaxial cable is connected to the antenna. A metal adapter cover is provided on the outer ring of the microwave coaxial cable, and an adjustment component for adjusting the microwave direction is provided on the outer ring of the antenna [1]. This design achieves the effect of directional ablation by adjusting the microwave direction through the adjustment component.

[0004] Furthermore, existing microwave ablation needle designs still have some technical problems. These mainly manifest in the following ways: During operation, the coaxial cable used to transmit microwave energy generates significant heat, and current cooling systems are unable to effectively dissipate this heat, leading to severe tissue carbonization during the ablation process. Tissue carbonization not only affects the ablation effect but can also cause the needle to adhere to tissue, increasing the difficulty of needle removal and the risk of complications. In addition, existing temperature monitoring systems often fail to accurately reflect the actual temperature distribution inside and outside the ablation area, making precise temperature control difficult and affecting the safety and effectiveness of the treatment.

[0005] Therefore, there is an urgent need for a microwave ablation needle with an efficient cooling system and precise temperature monitoring function to solve the problems existing in the current technology and improve the safety and effectiveness of microwave ablation therapy. Utility Model Content

[0006] The purpose of this invention is to provide a microwave ablation needle to solve the problem that, when using existing microwave ablation needles, the coaxial cable used to transmit microwave energy generates a lot of heat during operation, which cannot be effectively cooled and dissipated, resulting in severe tissue carbonization during the ablation process.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0008] A microwave ablation needle includes an outer needle tube, a needle tip, an antenna terminal, and a coaxial cable. The needle tip is fixed to the outer needle tube, which has a hollow cylindrical structure and contains a water pipe and an antenna terminal. The water pipe is sleeved on the outside of the coaxial cable and connected to the antenna terminal. An inner water channel is formed between the water pipe and the coaxial cable, and an outer water channel is formed between the water pipe and the outer needle tube.

[0009] Furthermore, it also includes a metal collar, which is fitted over the coaxial cable connected to the antenna terminal and is located on the side opposite to the connection position of the antenna terminal.

[0010] Furthermore, it also includes a first temperature detector and a second temperature detector, with the first temperature detector installed in the inner waterway and the second temperature detector installed in the outer waterway.

[0011] Furthermore, the microwave ablation needle also includes a first cavity, a second cavity, an outlet pipe, and an inlet pipe. The first cavity is connected to the outer water channel, and the other end of the first cavity is connected to the outlet pipe. The second cavity is connected to the inner water channel, and the other end of the second cavity is connected to the inlet pipe.

[0012] Furthermore, the microwave ablation needle also includes a shell, and both the first cavity and the second cavity are fixedly disposed inside the shell.

[0013] Furthermore, the antenna terminal has a cylindrical structure with four rectangular ridges evenly arranged along the axial direction on the outer side. The end of the rectangular ridge away from the needle tip has a chamfer, and the end near the needle tip has a gap reserved to facilitate the insertion and fixation of the needle tip.

[0014] Furthermore, four rectangular ridges corresponding to the antenna terminal are provided on the inner side of the needle and at the fixing point of the antenna terminal.

[0015] This utility model has the following beneficial effects:

[0016] 1. This utility model sets up internal and external circulating cooling water channels and sets up antenna terminals and needles with rectangular ridges so that the cooling channels can reach the front end of the needle and the cooling liquid can be evenly distributed in the needle tube, so that the needle part can be effectively and evenly cooled, thereby reducing the phenomenon of tissue carbonization during the ablation process.

[0017] 2. Placing a metal collar on the outside of the coaxial cable can effectively suppress the reverse high-frequency current on the outer layer of the coaxial cable, thereby concentrating microwave energy in the tip emission area and making the ablation area more spherical, which helps to reduce unnecessary damage to healthy tissue.

[0018] 3. A temperature sensor is installed in both the inner and outer channels to more accurately detect the temperature of the ablation needle, thereby adjusting the circulation speed of the coolant in a timely manner to further reduce tissue carbonization caused by excessively high temperature in the ablation area. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the device structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0021] Figure 3 This is an enlarged sectional view of the needle tip of this utility model;

[0022] Figure 4 This is a schematic diagram of the internal and external waterway structure of this utility model;

[0023] Figure 5 This is a cross-sectional view of the outer needle tube of this utility model;

[0024] Figure 6 This is a schematic diagram of the antenna terminal structure of this utility model.

[0025] Figures 1 to 6 The reference numerals in the attached drawings are respectively: 1-outer shell, 2-first cavity, 3-second cavity, 4-outlet pipe, 5-inlet pipe, 6-outer needle tube, 7-needle, 8-antenna terminal, 9-coaxial cable, 10-metal collar, 11-first temperature detector, 12-second temperature detector, 13-first pipe, 14-second pipe. Detailed Implementation

[0026] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] Example 1:

[0028] As attached Figure 1 , 2 As shown, this invention relates to a microwave ablation needle, the specific structure of which includes a shell 1, a water tank assembly disposed inside the shell 1, an outer needle tube 6, a needle tip 7, an antenna terminal 8, a coaxial cable 9, a metal collar 10, and a temperature detection device. The water tank assembly includes a first cavity 2 and a second cavity 3 that are isolated from each other. The first cavity 2 is connected to a water outlet pipe 4, and the second cavity 3 is connected to a water inlet pipe 5. The outer needle tube 6 is made of non-magnetic titanium alloy and has a hollow cylindrical structure. One end of the needle tube is fixed to the water tank by welding or bonding. The needle tip 7 is made of high-strength, high-toughness, and high-temperature-resistant zirconium-aluminum composite material. It is fixed to the end of the outer needle tube 6 away from the shell 1 by threaded connection and thread-locking adhesive, or by providing an overflow groove in the needle tip 7 for bonding, ensuring structural strength and preventing detachment during the procedure.

[0029] As attached Figure 3 , 4 As shown in Figure 5, the internal water channel consists of a first pipe 13 and a second pipe 14. The first pipe 13 is made of high-temperature resistant Teflon material, and its outer surface is plasma-treated before being bonded and fixed to the second pipe 14, which is made of plastic. This internal water channel is sleeved on the outside of the coaxial cable 9, forming an inner water channel together; at the same time, this combined pipe and the inner wall of the outer needle tube 6 form an outer water channel.

[0030] As attached Figure 6 As shown, the antenna terminal 8 is made of non-magnetic metal. Its structure consists of four rectangular ridges evenly distributed axially on the outer side of a cylinder. A chamfer is provided at the near end to facilitate internal water channel assembly, and a gap is reserved at the far end for insertion of the needle 7. The needle 7 has four corresponding rectangular ridges on its inner side. When the antenna terminal 8 is inserted into the hollow cavity of the needle 7, the two rectangular ridges abut against each other to achieve circumferential positioning. The coaxial cable 9 consists of an inner copper core, an insulating layer, and an outer metal tube. After its core is inserted into the central hole of the antenna terminal 8, a reliable conductive connection is achieved through laser filler welding via radial transverse holes. The metal collar 10 is fixed to the outside of the coaxial cable 9 by welding or bonding, and is on the side opposite to the connection position of the antenna terminal 8, effectively suppressing reverse high-frequency current and concentrating microwave energy towards the tip.

[0031] The temperature detection device includes a first temperature detector 11 located in the inner water channel and a second temperature detector 12 located in the outer water channel, which monitor the water temperature of the cooling needle body and the needle tip, respectively. The detection signal is transmitted to the microwave host via the handle circuit. The host dynamically adjusts the cooling water circulation speed by comparing the temperature difference between the two detectors: when the temperature difference exceeds a set threshold, the circulation is accelerated to achieve precise temperature control. The first cavity 2 of the water tank is connected to the outer water channel as the water outlet path, and the second cavity 3 is connected to the inner water channel as the water inlet path. The two cavities are isolated by threads or welding / bonding. The first pipe 13 is sealed to the wall of the first cavity 2 by a sealing ring. The coaxial cable 9 is welded to the connector inside the water tank, and the connector is welded or bonded to the wall of the second cavity 3 to form a sealed structure. The outer shell 1 covers the water tank and connecting parts to form a handheld part, protecting the operator from contact risks.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A microwave ablation needle, characterized in that, It includes an outer needle tube (6), a needle (7), an antenna terminal (8), and a coaxial cable (9). The needle (7) is fixed to the outer needle tube (6). The outer needle tube (6) is a hollow cylindrical tube structure with a water pipe and the antenna terminal (8) inside. The water pipe is sleeved on the outside of the coaxial cable (9) and connected to the antenna terminal (8). An inner water channel is formed between the water pipe and the coaxial cable (9), and an outer water channel is formed between the water pipe and the outer needle tube (6).

2. The microwave ablation needle according to claim 1, characterized in that, It also includes a metal collar (10), the coaxial cable (9) is connected to the antenna terminal (8), the metal collar (10) is sleeved on the outside of the coaxial cable (9), and is on the side opposite to the connection position of the antenna terminal (8).

3. The microwave ablation needle according to claim 1, characterized in that, It also includes a first temperature detector (11) and a second temperature detector (12), with the first temperature detector (11) located in the inner waterway and the second temperature detector (12) located in the outer waterway.

4. The microwave ablation needle according to claim 1, characterized in that, The antenna terminal (8) is a cylindrical structure with four rectangular ridges evenly arranged along the axial direction on the outer side. The end of the rectangular ridge away from the needle (7) is chamfered, and the end near the needle (7) is reserved with a gap to facilitate the insertion and fixing of the needle (7).

5. A microwave ablation needle according to claim 4, characterized in that, The inner side of the needle (7) and the fixed position of the antenna terminal (8) are provided with four rectangular ridges corresponding to the antenna terminal (8).

6. A microwave ablation needle according to claim 1, characterized in that, It also includes a first cavity (2), a second cavity (3), an outlet pipe (4) and an inlet pipe (5). The first cavity (2) is connected to the outer water channel, and the other end of the first cavity (2) is connected to the outlet pipe (4). The second cavity (3) is connected to the inner water channel, and the other end of the second cavity (3) is connected to the inlet pipe (5).

7. A microwave ablation needle according to claim 6, characterized in that, It also includes a shell (1), and the first cavity (2) and the second cavity (3) are both fixedly disposed inside the shell (1).

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