Multi-channel microwave ablation needle

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a multi-channel microwave ablation needle. Aiming at the problems of uneven energy distribution and single thermal field regulation and control in the design of a single coaxial cable in the prior art, the utility model provides a multi-channel microwave ablation needle which comprises an ablation needle handle and a needle rod fixedly connected to the ablation needle handle, and an ablation needle head is arranged at one end, far away from the ablation needle handle, of the needle rod. A plurality of coaxial cables used for transmitting microwave signals are further arranged in the ablation needle handle, one end of each coaxial cable penetrates through the needle rod and extends into the ablation needle head, and the coaxial cables are evenly distributed in the circumferential direction of the axis of the ablation needle head. According to the utility model, the plurality of coaxial cables are uniformly arranged along the circumferential direction of the axis of the ablation needle head, and three coaxial cables are preferably adopted, so that the power, the phase and the working time of each coaxial cable can be independently controlled, and the accurate regulation and control of an energy field can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and in particular relates to a multi-channel microwave ablation needle. Background Technology

[0002] Microwave ablation, as a minimally invasive treatment, has been widely used for the thermal ablation of tumors and diseased tissues. Its core principle is to convert high-frequency electromagnetic wave energy into heat energy through a microwave antenna, causing coagulative necrosis of the target tissue at high temperatures. In existing technologies, microwave ablation needles typically use a single coaxial cable structure as the energy transmission channel, and their design uses a single antenna to emit microwave energy to form a thermal field. However, the applicant has found that this single coaxial cable design is the main reason for uneven energy distribution and limited thermal field control.

[0003] For example, a Chinese utility model patent discloses a microwave ablation needle [Application No.: CN 202122197787.3]. This utility model patent includes a needle tip, an outer needle tube, a coaxial cable, a radiator, a water inlet tube, and a spiral choke ring. The coaxial cable, the spiral choke ring, the water inlet tube, and the outer needle tube are coaxially sleeved sequentially from the inside out. The spiral choke ring is attached to the outermost layer of the coaxial cable. Gaps exist between the water inlet tube and the spiral choke ring, and between the water inlet tube and the outer needle tube. The outer needle tube includes ceramic and metal types. The head end of the ceramic outer needle tube is fixedly connected to or integrally formed with the needle tip. The tail end of the ceramic outer needle tube... The radiator is fixedly connected coaxially to the metal outer needle tube, and is fixedly connected to or integrally formed with the inner conductor of the coaxial cable. The radiator and the spiral choke ring are located inside the cavity of the ceramic outer needle tube, and the radiator is close to the needle tip. The water inlet tube includes a PTEF water inlet tube and a metal water inlet tube. The PTEF water inlet tube is coaxially connected to the metal water inlet tube. The PTEF water inlet tube is partially or entirely located inside the cavity of the ceramic outer needle tube, and the metal water inlet tube is located inside the cavity of the metal outer needle tube and outside the cavity of the ceramic outer needle tube.

[0004] Although this utility model patent has the advantages of suppressing microwave escape to the distal end of the needle tip, fully cooling the needle tip, and improving clinical efficacy, its technical solution of using a single coaxial cable still cannot avoid the aforementioned problems of uneven energy distribution and single thermal field control. Utility Model Content

[0005] The purpose of this invention is to address the above-mentioned problems by providing a multi-channel microwave ablation needle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A multi-channel microwave ablation needle includes an ablation needle handle and a needle bar fixedly connected to the ablation needle handle. An ablation needle head is provided at one end of the needle bar away from the ablation needle handle. A coaxial cable for transmitting microwave signals is also provided inside the ablation needle handle. One end of the coaxial cable passes through the needle bar and extends into the ablation needle head. Several coaxial cables are provided and are evenly distributed circumferentially along the axis of the ablation needle head.

[0008] In the aforementioned multi-channel microwave ablation needle, there are three coaxial cables, and the ablation needle head is also provided with three end sealing holes. The ends of the coaxial cables extend into the end sealing holes and are sealed and connected to the end sealing holes, and the coaxial cables and end sealing holes are arranged in a one-to-one correspondence.

[0009] In the aforementioned multi-channel microwave ablation needle, the three end sealing holes extend to different depths within the ablation needle tip.

[0010] The aforementioned multi-channel microwave ablation needle also includes a temperature measuring ring fixedly connected to the ablation needle head. The temperature measuring ring has three rings arranged sequentially along the axis of the ablation needle head, and each temperature measuring ring is correspondingly located on the outer side of the end of a coaxial cable.

[0011] In the aforementioned multi-channel microwave ablation needle, the coaxial cable comprises, from the outside to the inside, an outer conductor, a dielectric layer, and an inner core, with the centerlines of the outer conductor, dielectric layer, and inner core all overlapping.

[0012] In the aforementioned multi-channel microwave ablation needle, the ends of both the dielectric layer and the inner core extend to the outside of the outer conductor and into the end sealing hole for sealing connection.

[0013] In the aforementioned multi-channel microwave ablation needle, the ablation needle tip is made of non-metallic material.

[0014] In the aforementioned multi-channel microwave ablation needle, the handle of the ablation needle also contains a storage tank for storing circulating cooling medium. The storage tank is connected to a cooling pipe, one end of which extends into the ablation needle head.

[0015] Compared with existing technologies, the advantages of this utility model are:

[0016] 1. This utility model has multiple coaxial cables evenly arranged around the axis of the ablation needle. The preferred embodiment uses three coaxial cables, so that the power, phase and working time of each coaxial cable can be independently controlled, thereby achieving precise control of the energy field. At the same time, when multiple coaxial cables work simultaneously, the microwave energy fields they radiate will be superimposed in space to form a more uniform and wider ablation area.

[0017] 2. This utility model has a temperature measuring ring at the end of each coaxial cable, which can provide real-time feedback on temperature and lesion shape. The system can dynamically adjust the power and working status of each coaxial cable to optimize the ablation effect. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is an exploded view of a portion of the structure of this utility model;

[0021] Figure 4 This is a cross-sectional view of the present invention;

[0022] In the diagram: 1. Ablation needle handle; 2. Needle bar; 3. Ablation needle tip; 4. Coaxial cable; 5. End sealing hole; 6. Temperature measuring ring; 7. Storage box; 8. Cooling pipe; 9. Outer conductor; 10. Dielectric layer; 11. Inner core. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] Combination Figure 1-3 As shown, a multi-channel microwave ablation needle includes an ablation needle handle 1 and a needle bar 2 fixedly connected to the ablation needle handle 1. An ablation needle head 3 is provided at the end of the needle bar 2 away from the ablation needle handle 1. The ablation needle head 3 is made of a non-metallic material, such as ceramic. A coaxial cable 4 for transmitting microwave signals is also provided inside the ablation needle handle 1. One end of the coaxial cable 4 passes through the needle bar 2 and extends into the ablation needle head 3. Several coaxial cables 4 are provided and evenly distributed circumferentially along the axis of the ablation needle head 3. Preferably, there are three coaxial cables 4. The ablation needle head 3 also has three end sealing holes 5. The ends of the coaxial cables 4 extend into the end sealing holes 5 and are sealed to the end sealing holes 5, with each coaxial cable 4 corresponding to one end sealing hole 5.

[0025] The ablation principle of multiple coaxial cables 4 is similar to that of a single coaxial cable 4; both utilize microwave energy to cause water molecules in the tissue to vibrate at high speed, generating heat and causing the tissue to coagulate and necrotize. However, when using multiple coaxial cables 4, the power, phase, and operating time of each cable 4 can be independently controlled, thus achieving precise control of the energy field. When multiple coaxial cables 4 operate simultaneously, their radiated microwave energy fields superimpose in space, forming a more uniform and wider ablation area, significantly shortening the ablation time.

[0026] Combination Figure 3 and Figure 4 As shown, the three end sealing holes 5 extend to different depths within the ablation needle 3, ensuring that the ends of the coaxial cables 4 are sequentially distributed along the axis of the ablation needle 3. It also includes three temperature-sensing rings 6 fixedly connected to the ablation needle 3, arranged sequentially along the axis of the ablation needle 3. Each temperature-sensing ring 6 is positioned on the outer side of the end of one coaxial cable 4. This invention provides a temperature-sensing ring 6 at the end of each coaxial cable 4. The temperature-sensing ring 6 can monitor the center temperature of the three microwave energy fields in real time. The temperature data is fed back to the control system, which dynamically adjusts the microwave power according to a preset temperature threshold to avoid overheating or incomplete ablation. When the temperature exceeds the safe range, the system automatically reduces the power or stops working to prevent tissue carbonization and damage to surrounding normal tissue, thereby optimizing the ablation effect.

[0027] like Figure 4 As shown, the coaxial cable 4 comprises, from the outside to the inside, an outer conductor 41, a dielectric layer 42, and an inner core 43, with the centerlines of the outer conductor 41, dielectric layer 42, and inner core 43 all coinciding. The ends of the dielectric layer 42 and the inner core 43 extend beyond the outer conductor 41 and into the end sealing hole 5, where they are sealed together.

[0028] like Figure 2 As shown, the ablation needle handle 1 also contains a storage tank for storing circulating cooling medium. A cooling pipe 8 is connected to the storage tank, and one end of the cooling pipe 8 extends into the ablation needle head 3. In this way, the cooling pipe 8 can deliver cooling medium, such as cooling water, into the ablation needle head 3, effectively reducing heat accumulation in the ablation needle head 3, minimizing skin burns and carbonization in the central area of ​​the ablation zone, and improving the morphology of the coagulated necrotic area after microwave ablation.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0030] Although this document frequently uses terms such as ablation needle handle 1, needle bar 2, ablation needle tip 3, coaxial cable 4, end sealing hole 5, temperature sensing ring 6, storage box, cooling pipe 8, outer conductor 41, dielectric layer 42, and inner core 43, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A multi-channel microwave ablation needle, comprising an ablation needle handle (1) and a needle bar (2) fixedly connected to the ablation needle handle (1), wherein an ablation needle tip (3) is provided at one end of the needle bar (2) away from the ablation needle handle (1), characterized in that: The ablation needle handle (1) is also provided with a coaxial cable (4) for transmitting microwave signals. One end of the coaxial cable (4) passes through the needle bar (2) and extends into the ablation needle head (3). The coaxial cable (4) has several strands and is evenly distributed circumferentially along the axis of the ablation needle head (3).

2. The multi-channel microwave ablation needle as described in claim 1, characterized in that: The coaxial cable (4) has three wires. The ablation needle (3) also has three end sealing holes (5). The end of the coaxial cable (4) extends into the end sealing hole (5) and is sealed to the end sealing hole (5). The coaxial cable (4) and the end sealing hole (5) are arranged in a one-to-one correspondence.

3. The multi-channel microwave ablation needle as described in claim 2, characterized in that: The three end sealing holes (5) extend to different depths within the ablation needle (3).

4. The multi-channel microwave ablation needle as described in claim 3, characterized in that: It also includes a temperature measuring ring (6) fixedly connected to the ablation needle (3). There are three temperature measuring rings (6) arranged sequentially along the axis of the ablation needle (3). Each temperature measuring ring (6) is correspondingly set on the outer side of the end of a coaxial cable (4).

5. A multi-channel microwave ablation needle as described in claim 2, characterized in that: The coaxial cable (4) includes an outer conductor (41), a dielectric layer (42), and an inner core (43) from the outside to the inside, and the centerlines of the outer conductor (41), the dielectric layer (42), and the inner core (43) are all coincident.

6. The multi-channel microwave ablation needle as described in claim 5, characterized in that: The ends of the dielectric layer (42) and the inner core (43) extend to the outside of the outer conductor (41) and into the end sealing hole (5) for sealing connection.

7. The multi-channel microwave ablation needle as described in claim 1, characterized in that: The ablation needle (3) is made of non-metallic material.

8. The multi-channel microwave ablation needle as described in claim 1, characterized in that: The ablation needle handle (1) also contains a storage tank for storing circulating cooling medium. The storage tank is connected to a cooling pipe (8), one end of which extends into the ablation needle (3).

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