Plasma radio frequency ablation electrode with enhanced insulation

Abstract

The plasma radio frequency ablation electrode comprises an electrode sub-needle, an electrode insulating layer and a metal loop electrode, wherein the electrode sub-needle, the electrode insulating layer and the metal loop electrode are coaxially connected in a sleeved mode from inside to outside and are tightly matched with one another. One end of the metal loop electrode is provided with a reducing structure which extends along the central axis direction and has an enlarged aperture; an assembly space is formed between the variable-diameter structure and the electrode insulating layer extending into the variable-diameter structure; a reinforced insulating layer is arranged in the assembly space; the electrode sub-needles, the electrode insulating layers and the reinforcing insulating layers are all provided with extending parts extending out of the diameter changing structures, and the electrode sub-needles are provided with working ends extending out of the extending parts of the electrode insulating layers. Two layers of insulation protection are added between the electrode sub-needle and the metal loop electrode, so that the phenomenon that an electrode insulation layer is broken down or fails due to long-time work of the radiofrequency ablation electrode is effectively reduced, and the durability and the stability of the radiofrequency ablation electrode in use are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ablation electrodes, in particular to a plasma radio frequency ablation electrode with enhanced insulation. Background Art

[0002] In the prior art, plasma radiofrequency ablation electrodes generally include a central electrode needle, an insulating layer, a loop electrode and other structures. The current passes through the central electrode needle to reach the patient's position, and forms an electrode reaction with the loop electrode and the dielectric solution between the two to ablate the wound or lesion. The disadvantage is that the working end (front end) of the electrode will generate high heat and current reaction during the ablation process. Under the action of current reaction and high temperature and heat, the insulation performance of the above-mentioned insulating layer is unstable and is easily burned or broken down, which leads to abnormal energy output during the ablation process, directly affecting the surgical effect. Utility Model Content

[0003] In view of the above-mentioned technical problems, the purpose of the utility model is to propose a plasma radiofrequency ablation electrode with enhanced insulation, which adds two layers of insulation protection between the electrode sub-needle and the metal loop electrode, effectively reducing the breakdown or failure of the electrode insulation layer caused by long-term operation of the radiofrequency ablation electrode, and effectively increasing the durability and stability of the radiofrequency ablation electrode.

[0004] The technical solution of the utility model is realized as follows: a plasma radiofrequency ablation electrode with enhanced insulation, comprising an electrode sub-needle, an electrode insulating layer, and a metal loop electrode which are coaxially sleeved from inside to outside and closely matched with each other;

[0005] One end of the metal loop electrode is formed with a diameter-changing structure extending along the central axis direction and with an enlarged diameter; an assembly space is formed between the diameter-changing structure and the electrode insulation layer extending into the diameter-changing structure; a reinforced insulation layer for insulating the metal loop electrode and the electrode insulation layer is provided in the assembly space;

[0006] The electrode sub-needle, the electrode insulating layer and the reinforced insulating layer all have an extension portion extending out of the diameter-changing structure, and the electrode sub-needle has a working end extending out of the extension portion of the electrode insulating layer.

[0007] Furthermore, the reinforced insulating layer is coaxially sleeved on the outside of the electrode insulating layer, and the reinforced insulating layer and the electrode insulating layer, as well as the reinforced insulating layer and the variable diameter structure, are tightly matched and connected.

[0008] Furthermore, the variable diameter structure includes a conical section connected to the metal loop electrode and a cylindrical section connected to the conical section; and the reinforced insulating layer extends into the cylindrical section.

[0009] Furthermore, the material of the electrode insulating layer is one of polyimide, polyether block amide and polytetrafluoroethylene.

[0010] Furthermore, the material of the reinforced insulating layer is one of polytetrafluoroethylene and alumina ceramics.

[0011] Furthermore, the radiofrequency ablation electrode includes an outer metal tube and a handle component; the outer metal tube is sleeved on the outside of the metal loop electrode; the handle component is fixedly connected to the outer metal tube; and an isolation insulating layer is sleeved between the outer metal tube and the metal loop electrode.

[0012] Furthermore, the working end of the electrode sub-needle forms an enlarged portion whose outer diameter is not less than the outer diameter of the reinforced insulating layer.

[0013] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0014] 1. The utility model arranges a variable diameter structure on the metal loop electrode near the working end of the electrode sub-needle through the coordinated use of a variable diameter structure and a reinforced insulating layer, and adds a reinforced insulating layer between the variable diameter structure and the metal loop electrode to form two layers of insulation protection, thereby effectively reducing the phenomenon of the electrode insulation layer being punctured or failing due to long-term operation of the radio frequency ablation electrode, and effectively increasing the durability and stability of the radio frequency ablation electrode.

[0015] 2. The utility model uses a variable diameter structure without changing or only slightly changing the outer diameter of the entire radiofrequency ablation electrode, thereby ensuring that the overall structural performance is enhanced while not changing the controllability and surgical adaptability of the radiofrequency ablation electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the overall structure of the utility model;

[0018] Figure 2 for Figure 1 A in the enlarged view;

[0019] Figure 3 for Figure 2 A cross-sectional view of the internal structure of the device;

[0020] Among them: 1. Electrode needle; 11. Working end; 2. Electrode insulation layer; 3. Metal loop electrode; 4. Isolation insulation layer; 5. Outer metal tube; 6. Variable diameter structure; 61. Conical section; 62. Cylindrical section; 7. Reinforced insulation layer; 8. Handle component; 81. Cable. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0022] like Figure 1-3 The present invention shows a plasma radiofrequency ablation electrode with enhanced insulation described in this embodiment, which is suitable for radiofrequency ablation surgery in medical treatment. The radiofrequency ablation electrode includes an electrode sub-needle 1, an electrode insulating layer 2, and a metal loop electrode 3 which are coaxially sleeved from the inside to the outside. The electrode sub-needle 1 is the central electrode needle in the aforementioned background technology. The electrode insulating layer 2 and the metal loop electrode 3 are both sleeve structures, and the electrode sub-needle 1 passes through the inside of the electrode insulating layer 2, while the electrode insulating layer 2 passes through the inside of the metal loop electrode 3. The electrode sub-needle 1, the electrode insulating layer 2 and the metal loop electrode 3 are in contact with each other to form a tight fit. The electrode insulating layer 2 isolates the electrode sub-needle 1 and the metal loop electrode 3 from each other so that the two are insulated. A variable diameter structure 6 is integrally formed at one end of the metal loop electrode 3. The variable diameter structure 6 extends along the central axis direction of the metal loop electrode 3, and the diameter of the variable diameter structure 6 is enlarged to be away from the electrode insulating layer 2, so that an assembly space is formed between the variable diameter structure 6 and the electrode insulating layer 2 extending into the variable diameter structure 6. In the specific structural design, the diameter-changing structure 6 includes a conical section 61 and a cylindrical section 62 , wherein the conical section 61 is connected between the end of the metal return electrode 3 and the cylindrical section 62 .

[0023] A reinforced insulating layer 7 is arranged in the aforementioned assembly space to isolate the electrode insulating layer 2 and the metal loop electrode 3 from each other and insulate the two. In the present embodiment, the reinforced insulating layer 7 is a sleeve structure, which is coaxially sleeved on the outside of the electrode insulating layer 2, and the reinforced insulating layer 7 and the electrode insulating layer 2 as well as the reinforced insulating layer 7 and the diameter-changing structure 6 are tightly fitted and connected. During assembly, the reinforced insulating layer 7 extends into the cylindrical section 62. The aforementioned electrode sub-needle 1, electrode insulating layer 2 and reinforced insulating layer 7 all have an extension extending out of the diameter-changing structure 6. Among them, the electrode sub-needle 1 has a working end 11 extending out of the extension of the electrode insulating layer 2 and the extension of the reinforced insulating layer 7. The working end of the electrode sub-needle 1 forms an enlarged portion whose outer diameter is not less than the outer diameter of the reinforced insulating layer 7, so that during surgery, the working end 11 of the electrode sub-needle 1 can better contact the surgical site without being blocked by the reinforced insulating layer 7.

[0024] The material of the electrode insulating layer is a medical high molecular polymer in the form of a thin tube, which can be one of polyimide (PI), polyether block amide (Pebax), polytetrafluoroethylene (PTFE) and the like.

[0025] The material of the reinforced insulating layer is a medical polymer or ceramic material with high insulation performance and heat resistance, and can be one of the materials such as polytetrafluoroethylene (PTFE), alumina ceramics, etc.

[0026] In this embodiment, the radiofrequency ablation electrode includes an outer metal tube 5 and a handle component 8. The outer metal tube 5 is sleeved on the outside of the metal loop electrode 3, and its function is to provide support for the overall structure to ensure the support strength and controllability of the overall structure. An isolation insulating layer 4 is arranged between the outer metal tube 5 and the metal loop electrode 3 to insulate the outer metal tube 5 and the metal loop electrode 3 from each other. The handle component 8 is fixedly connected to the outer metal tube 5. The metal loop electrode 3 is connected to the loop electrode wire, and the electrode sub-needle 1 is connected to the emitter wire. The radio frequency transmitter is connected to the loop electrode wire of the metal loop electrode 3 and the emitter wire of the electrode sub-needle 1 through the tail plug.

[0027] In the specific structural design, the maximum outer diameter of the variable diameter structure 6 is not greater than or slightly greater than the outer diameter of the outer metal tube 5, so that the outer diameter of the entire radiofrequency ablation electrode can be unchanged or slightly changed, while ensuring the enhancement of the overall structural performance and without changing the controllability and surgical adaptability of the radiofrequency ablation electrode.

[0028] During specific use, the RF host emits RF current, which reaches the surgical site through the electrode sub-needle 1, excites the sodium ions in the physiological saline (electrolyte) at the surgical site, and generates an ionized plasma layer between the electrode sub-needle 1 and the metal loop electrode 3. The highly excited plasma quickly breaks the molecular bonds between the tissues, thereby achieving the purpose of cutting and ablation.

[0029] Through the above-mentioned structural design, a variable diameter structure 6 is arranged on the metal loop electrode 3 at a position close to the working end of the electrode sub-needle 1, and a reinforced insulating layer 7 is added between the variable diameter structure 6 and the metal loop electrode 3 to form two layers of insulation protection, which effectively reduces the breakdown or failure of the electrode insulating layer 2 caused by long-term operation of the radio frequency ablation electrode, and effectively increases the durability and stability of the radio frequency ablation electrode.

[0030] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A plasma radiofrequency ablation electrode with enhanced insulation, comprising an electrode sub-needle, an electrode insulating layer, and a metal loop electrode which are coaxially sleeved from the inside to the outside and closely matched with each other; characterized in that: One end of the metal loop electrode is formed with a diameter-changing structure extending along the central axis direction and with an enlarged diameter; an assembly space is formed between the diameter-changing structure and the electrode insulation layer extending into the diameter-changing structure; a reinforced insulation layer for insulating the metal loop electrode and the electrode insulation layer is provided in the assembly space; The electrode sub-needle, the electrode insulating layer and the reinforced insulating layer all have an extension portion extending out of the diameter-changing structure, and the electrode sub-needle has a working end extending out of the extension portion of the electrode insulating layer.

2. The plasma radio frequency ablation electrode with enhanced insulation according to claim 1, characterized in that: The reinforced insulating layer is coaxially sleeved on the outside of the electrode insulating layer, and the reinforced insulating layer and the electrode insulating layer, as well as the reinforced insulating layer and the diameter-changing structure, are tightly matched and connected.

3. The plasma radio frequency ablation electrode with enhanced insulation according to claim 1, characterized in that: The variable diameter structure comprises a conical section connected to the metal loop electrode and a cylindrical section connected to the conical section; the reinforced insulating layer extends into the cylindrical section.

4. The plasma radio frequency ablation electrode with enhanced insulation according to claim 1, characterized in that: The material of the electrode insulating layer is one of polyimide, polyether block amide and polytetrafluoroethylene.

5. The plasma radio frequency ablation electrode with enhanced insulation according to claim 1, characterized in that: The material of the reinforced insulating layer is one of polytetrafluoroethylene and alumina ceramics.

6. The plasma radio frequency ablation electrode with enhanced insulation according to claim 1, characterized in that: The radiofrequency ablation electrode comprises an outer metal tube and a handle component; the outer metal tube is sleeved on the outside of the metal loop electrode; the handle component is fixedly connected to the outer metal tube; an isolation insulating layer is sleeved between the outer metal tube and the metal loop electrode.

7. The plasma radio frequency ablation electrode with enhanced insulation according to claim 1, characterized in that: The working end of the electrode sub-needle forms an expanded portion whose outer diameter is not less than the outer diameter of the reinforced insulating layer.

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