Microwave ablation needle head capable of realizing high energy efficiency energy transmission

Abstract

The utility model relates to the technical field of ablation needle, specifically relates to a microwave ablation needle needle head that can realize high energy efficiency energy transmission, include: ablation part, ablation part has connecting portion and ablation end, connecting portion is connected in ablation end one end and extends along the axial direction of ablation end, coaxial cable core is fixedly connected with connecting portion through ultrasonic welding mode, makes ablation part and coaxial cable core form integral structure, sleeve, the connecting place of coaxial cable core and connecting portion is covered, strengthens the stability and protective property of connecting portion part, casing, cover in the outside of sleeve provides the outer layer protection of whole microwave ablation needle needle head, in the utility model, the connecting portion of ablation part and coaxial cable core is fixedly connected through ultrasonic welding, has reduced the loss in energy transmission process significantly, has improved energy transmission efficiency, has guaranteed that microwave energy can be transmitted to ablation part efficiently, stably, makes ablation needle needle head reach higher ablation temperature in shorter time.

Description

Technical Field

[0001] This utility model relates to the field of ablation needle technology, and in particular to a microwave ablation needle tip that can achieve high-efficiency energy transmission. Background Technology

[0002] In today's medical technology field, microwave ablation needles, with their unique advantages, have been widely used in various areas such as tumor treatment. In the structure of a microwave ablation needle, the processing method of the connection between the needle tip and the coaxial cable core is crucial; currently, a combination of welding and crimping methods is mainly used. Specifically, the needle tip of the microwave ablation needle has a small hole at the end connected to the needle shank for inserting the coaxial cable core. Then, external force is used to press the end of the connection between the needle tip and the needle shank, thus initially establishing the connection between the needle tip and the coaxial cable core. Afterwards, solder is used to weld the connection, filling the gap between the needle tip and the coaxial cable core, thereby completing the entire connection process.

[0003] However, this existing connection method has significant drawbacks. Firstly, because it relies primarily on external force to connect the microwave ablation needle tip and the coaxial cable core, the connection impedance between them is high. During radio frequency energy transmission, this connection point becomes the most heat-generating area, which not only affects energy transmission efficiency but may also cause unnecessary thermal damage to surrounding tissues. Secondly, this connection method relies on the pressure of the microwave ablation needle tip on the coaxial cable core and the adhesion of the solder between them. However, in actual use, as the operating temperature increases, the solder's performance is affected, easily leading to a loss of connection and causing the needle tip to detach. This severely impacts the normal use and treatment effectiveness of the microwave ablation needle, and may even cause medical accidents.

[0004] Therefore, this application develops a microwave ablation needle tip that can achieve high-efficiency energy transmission in order to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a microwave ablation needle tip that can achieve high-efficiency energy transmission, so as to solve the problem of easy detachment of ablation needles in the prior art.

[0006] The technical solution of this utility model is: a microwave ablation needle tip capable of achieving high-efficiency energy transmission, comprising:

[0007] The ablation section has a connecting portion and an ablation end, wherein the connecting portion is connected to one end of the ablation end and extends along the axial direction of the ablation end;

[0008] The coaxial cable core is fixedly connected to the connecting part by ultrasonic welding, so that the ablation part and the coaxial cable core form an integral structure;

[0009] A sleeve is fitted onto the connection between the coaxial cable core and the connecting part to enhance the stability and protection of the connection.

[0010] The housing, fitted over the sleeve, provides an outer layer of protection for the entire microwave ablation needle tip.

[0011] Preferably, a first section and a second section are cut along the axis of the connection on the side wall of the connection. The first section is recessed along its own central axis to form a mounting groove, which matches the coaxial cable core.

[0012] Preferably, at least a portion of the connecting portion forms the first cross section and the second cross section, such that the axial length of the first cross section is less than the axial length of the connecting portion.

[0013] Preferably, the first cross section has a height difference with the central axis of the connecting part, and when the coaxial cable core is placed in the mounting groove, the central axis of the coaxial cable core and the central axis of the connecting part are on the same straight line.

[0014] Preferably, the first cross section is arranged along the axis of the connecting portion, the second cross section is arranged along the radial direction of the connecting portion, and the first cross section is a plane and the second cross section is a sector-shaped surface.

[0015] Preferably, the end of the coaxial cable core is in contact with the second cross section.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] (1) The coaxial cable core and the ablation part are fixedly connected by ultrasonic welding technology to form an integrated structure, which significantly reduces the loss in the energy transmission process and improves the energy transmission efficiency. The coaxial cable core is installed in the mounting groove, which ensures that the microwave energy can be transmitted to the ablation part efficiently and stably, so that the ablation needle tip can reach a higher ablation temperature in a shorter time. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a schematic diagram of the ablation section of the present invention;

[0020] Figure 2 This is a side sectional view of a microwave ablation needle tip that can achieve high-efficiency energy transmission according to the present invention.

[0021] Figure 3 This is a cross-sectional view showing the position of the coaxial cable core and the connecting part described in this utility model;

[0022] Figure 4 This is a three-dimensional view of a microwave ablation needle tip that can achieve high-efficiency energy transmission, as described in this utility model.

[0023] The components are: 1. Ablation section; 11. Connecting section; 12. Ablation end; 2. Coaxial cable core; 3. Sleeve; 4. Housing; 5. First cross section; 6. Second cross section; 7. Mounting groove. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to specific embodiments:

[0025] like Figures 1-4 As shown, a microwave ablation needle tip capable of high-efficiency energy transmission includes an ablation section 1, a coaxial cable core 2, a sleeve 3, and a housing 4. The ablation section 1 includes a connecting section 11 and an ablation end 12. The connecting section 11 is connected to one end of the ablation end 12 and extends along the axial direction of the ablation end 12 to form a stable connection structure. The ablation end 12 serves as the direct point of action for microwave energy, efficiently converting microwave energy into heat energy for precise ablation of target tissue. The coaxial cable core 2 is fixedly connected to the connecting section 11 of the ablation section 1 by ultrasonic welding to form an integrated structure. The coaxial cable core 2 ensures stable and efficient energy transmission to the ablation section 1. The sleeve 3 is fitted at the connection between the coaxial cable core 2 and the connecting section 11 to enhance the stability and protection of the connection position and prevent loosening or damage caused by external factors. The housing 4 is fitted outside the sleeve 3 to provide outer protection for the entire microwave ablation needle tip, preventing interference or damage from the external environment during use.

[0026] In existing microwave ablation needle tip connection technologies, crimping and soldering are two commonly used methods. However, both methods have certain limitations in practical applications, particularly regarding thermal expansion and contraction, and heat transfer efficiency. Specifically, when the coaxial cable core 2 is connected to the ablation part 1 using crimping or soldering, a large amount of heat is generated at the ablation end 12 during the ablation operation. This heat is transferred along the connection path, causing the entire ablation needle tip to expand due to heat. When the ablation operation stops and the needle tip cools down, it contracts. This periodic thermal expansion and contraction process easily causes stress concentration at the crimped or soldered connection part 11, leading to loosening of the connection and affecting the stability and service life of the ablation needle tip.

[0027] Especially when connecting via soldering, the heat transfer path is relatively complex. Heat must first be transferred to the solder layer, then through the solder layer to the connection part 11, and finally to the ablation end 12. This multi-layered heat transfer not only increases thermal resistance and reduces heat transfer efficiency, but may also generate additional stress at the connection part 11 due to differences in the thermal expansion coefficients of the materials in each layer, further exacerbating the risk of loosening. In this embodiment, by employing ultrasonic welding technology to connect the ablation part 1 to the coaxial cable core 2, heat does not need to pass through multiple layers; its heating point is at the ablation end 12, reducing energy loss during transmission and improving energy transfer efficiency. This allows the microwave ablation needle tip to reach a higher ablation temperature in a shorter time, improving the ablation effect while reducing the risk of damage to surrounding normal tissues.

[0028] In this embodiment, as Figures 1-2 As shown, the sidewall of the connecting part 11 is cut along the axial direction of the connecting part 11 to form two distinct cross sections, namely the first cross section 5 and the second cross section 6. Specifically, the first cross section 5 is recessed along its own central axis to form a mounting groove 7 of a specific shape. The shape and size of the mounting groove 7 match the outer contour of the coaxial cable core 2, which can ensure that the coaxial cable core 2 can be accurately and firmly embedded therein. This not only enhances the connection stability between the coaxial cable core 2 and the connecting part 11, but also improves the energy transmission efficiency through precise matching, providing a solid foundation for the performance optimization of the entire microwave ablation needle tip.

[0029] Furthermore, such as Figure 3 As shown, at least a portion of the connecting part 11 is configured to form two different cross sections, namely a first cross section 5 and a second cross section 6. The first cross section 5 extends along the axial direction of the connecting part 11 and presents a planar structure. It is not completely coincident with the central axis of the connecting part 11, but there is a certain height difference. As a plane, the first cross section 5 provides a stable support surface for the coaxial cable core 2 and helps with positioning, ensuring that the coaxial cable core 2 is accurately positioned in the mounting groove 7. Since there is a height difference between the first cross section 5 and the central axis of the connecting part 11, it helps to optimize the energy transmission path and reduce energy loss during transmission. The second cross section 6 is set along the radial direction of the connecting part 11 and is perpendicular to the first cross section 5, presenting a fan-shaped structure. When the coaxial cable core 2 is placed in the mounting groove 7, its central axis is precisely aligned and is on the same straight line as the central axis of the connecting part 11, ensuring that energy can be efficiently and stably transmitted through the coaxial cable core 2 to the connecting part 11, and then to the ablation part 1. At the same time, the end of the coaxial cable core 2 is in contact with the second cross section 6, increasing the efficiency of heat transfer.

[0030] Specifically, the first section 5 extends less than the axial length of the connecting part 11 in the axial direction than the entire axial length of the connecting part 11. In other words, the first section 5 is only a part of the connecting part 11 along the axial direction, not the whole of it, thus providing space and convenience for the installation of subsequent components or the realization of specific functions.

[0031] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A microwave ablation needle tip capable of achieving high-efficiency energy transfer, characterized in that, include: The ablation section (1) has a connecting section (11) and an ablation end (12). The connecting section (11) is connected to one end of the ablation end (12) and extends along the axial direction of the ablation end (12). The coaxial cable core (2) is fixedly connected to the connecting part (11) by ultrasonic welding, so that the ablation part (1) and the coaxial cable core (2) form an integral structure; A sleeve (3) is fitted at the connection between the coaxial cable core (2) and the connecting part (11) to enhance the stability and protection of the connecting part (11). The housing (4) is fitted over the sleeve (3) to provide outer protection for the entire microwave ablation needle tip.

2. The microwave ablation needle tip capable of high-efficiency energy transmission according to claim 1, characterized in that: On the side wall of the connecting part (11), a first section (5) and a second section (6) are cut along the axis of the connecting part (11). The first section (5) is recessed along its own central axis to form an installation groove (7), which matches the coaxial cable core (2).

3. The microwave ablation needle tip capable of high-efficiency energy transmission according to claim 2, characterized in that: At least a portion of the connecting portion (11) forms the first cross section (5) and the second cross section (6), such that the axial length of the first cross section (5) is less than the axial length of the connecting portion (11).

4. The microwave ablation needle tip capable of high-efficiency energy transmission according to claim 2, characterized in that: The first section (5) has a height difference with the central axis of the connecting part (11). When the coaxial cable core (2) is placed in the mounting groove (7), the central axis of the coaxial cable core (2) and the central axis of the connecting part (11) are on the same straight line.

5. A microwave ablation needle tip capable of high-efficiency energy transmission according to claim 2, characterized in that: The first section (5) is arranged along the axis of the connecting part (11), and the second section (6) is arranged along the radial direction of the connecting part (11). The first section (5) is a plane, and the second section (6) is a fan-shaped surface.

6. The microwave ablation needle tip capable of high-efficiency energy transmission according to claim 2, characterized in that: The end of the coaxial cable core (2) is in contact with the second cross section (6).

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