Electrode with excellent comprehensive performance for electro-hydraulic lithotripter

Abstract

The utility model discloses an electrode with excellent comprehensive performance for an electro-hydraulic lithotripter, which comprises an electrode main body, the electrode main body is a PEEK conduit, the PEEK conduit is provided with two cavity holes, and the cavity holes are arranged along the length direction of the PEEK conduit in a penetrating manner; and electrode metal wires are respectively arranged in the cavity holes, respectively extend out of one end of the PEEK catheter and are provided with metal caps. The electrode for the electro-hydraulic lithotripter is simple in structure, excellent in comprehensive performance, good in insulativity and high in hardness, meanwhile, the overall rigidity of the electrode is improved, when the electrode is used in cooperation with an endoscope, in the process that the electrode body penetrates into the endoscope, along with the increase of the penetrating distance, the penetrating difficulty of the electrode cannot be sharply increased, and the service life of the electrode is prolonged. And the electrode main body is not easy to fold and block in the penetrating process, the penetrating process is relatively smooth, and the situation that the whole product cannot be normally used or even scrapped is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electrohydraulic lithotripsy, and particularly relates to an electrode for an electrohydraulic lithotripter with excellent comprehensive performance. Background Art

[0002] During electrohydraulic lithotripsy, an electrode is usually used in cooperation with an endoscope. Currently, the existing electrodes are too soft in hardness and stiffness. During the process of inserting the electrode into the endoscope, as the insertion distance increases, it becomes more and more difficult to insert the electrode. And once the electrode is bent during the insertion process, it is very difficult to continue inserting, resulting in the entire product being unable to be used normally or even scrapped.

[0003] For example, a Chinese utility model patent (publication number: CN219846695U) discloses a wound electrode with inner and outer insulation layers, which is provided with a positive electrode wire, an inner layer of PC insulation sheet, a negative conductive alloy sheet, and an outer layer of PC insulation sheet from the inside to the outside in sequence; although this electrode has good insulation and protection effects, the stiffness of this structure of the electrode is not high, and it is difficult to insert into a longer endoscope. Moreover, the inner layer of PC insulation sheet of this electrode is spirally wound around the outer periphery of the positive electrode wire, the negative conductive alloy sheet is spirally wound around the outer periphery of the inner layer of PC insulation sheet, and the outer layer of PC insulation sheet is spirally wound around the outer periphery of the negative conductive alloy sheet. Using this layer-by-layer winding process, although it is easy to ensure the thickness of the inner and outer insulation layers, the manufacturing process is relatively complex and the production difficulty is relatively large. Summary of the Invention

[0004] The purpose of the utility model is to provide an electrode for an electrohydraulic lithotripter with excellent comprehensive performance aiming at the problems existing in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An electrode for an electrohydraulic lithotripter with excellent comprehensive performance, including an electrode body. The electrode body is a PEEK catheter, and the PEEK catheter has at least two cavity holes which are arranged through along the length direction of the PEEK catheter; electrode metal wires are respectively arranged in the cavity holes, and the electrode metal wires respectively extend out of one end of the PEEK catheter.

[0007] The electrode for this electrohydraulic lithotripter has a simple structure and excellent comprehensive performance. While having good insulation and high hardness performance, it also improves the overall stiffness of the electrode. When used in cooperation with an endoscope, during the process of inserting this electrode body into the endoscope, as the insertion distance increases, the difficulty of inserting the electrode will not increase sharply. Moreover, during the insertion process, this electrode body is not easily bent and blocked, and the insertion process is relatively smooth, and it will not cause the entire product to be unable to be used normally or even scrapped.

[0008] During the process of being inserted, the electrode body can withstand a certain amount of external force, maintain its original slender shape, and transmit the force to the front end, enabling it to move forward along the existing path, smoothly penetrate into the reserved channel of the endoscope, and allow the electrode head to protrude. Throughout this process, both the PEEK catheter and the electrode wire can remain intact without damage, facilitating subsequent electrode operations.

[0009] The electrode body and the electrode wire inside it can bend along with the endoscope within the human body cavity to reach the lesion location. During this usage process, the electrode body can exhibit its flexibility, good insulation, corrosion resistance, etc., and can well protect these two metal electrodes.

[0010] Furthermore, the electrode wire is a silver wire, and the two electrode wires extend from the same end of the PEEK catheter, not only taking advantage of its good electrical conductivity, flexibility, and ductility, but also being able to utilize its good biocompatibility.

[0011] In some embodiments, a metal cap is also connected to the part of the electrode wire extending from the end of the PEEK catheter, which can protect the exposed electrode wire.

[0012] Furthermore, the metal cap is connected to the electrode wire by welding, and the metal cap is a copper cap or a silver cap.

[0013] Furthermore, both of the cavity holes are arranged parallel to the central axis of the PEEK catheter, and the two cavity holes are symmetrically arranged with respect to the central axis.

[0014] Furthermore, the connecting line of the centers of the two cavity holes passes through the central axis of the PEEK catheter, and there is a spacing of 0.1 - 0.3 mm between the outer circumferences of the two cavity holes.

[0015] Furthermore, the diameter of the cavity hole is 0.08 - 0.12 mm, the outer diameter of the PEEK catheter is 0.5 - 0.7 mm, and the diameter of the electrode wire is not greater than the diameter of the cavity hole.

[0016] Preferably, the diameter of the cavity hole is 0.1 mm, and the outer diameter of the PEEK catheter is 0.6 mm.

[0017] Furthermore, the length of the metal cap is longer than the length of the part of the electrode wire extending out, and the length of the metal cap is 3 - 5 mm.

[0018] Furthermore, the hardness of the PEEK catheter is not lower than 75D.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows: 1. The electrode structure of this liquid-electric lithotripter is simple, with excellent comprehensive performance. While having good insulation and high hardness properties, it also improves the overall stiffness of the electrode. When used in cooperation with an endoscope, during the process of the electrode body penetrating into the endoscope, as the penetration distance increases, the difficulty of electrode penetration does not increase sharply, and the electrode body is not easily bent or blocked during the penetration process, and the penetration process is relatively smooth, without causing the entire product to be unable to be used normally or even scrapped; 2. The electrode body and the electrode wire inside it can bend along with the endoscope in the human body cavity to reach the lesion position. During this use process, the electrode body can exert its flexibility, good insulation, corrosion resistance, etc., and can well protect these two metal electrodes; 3. Using a PEEK catheter as the electrode body enables it to have the characteristics of self-lubrication, with a lower friction coefficient, which can reduce the resistance of the electrode penetrating into the endoscope, and there is no need to set a lubricating coating on its outer periphery. Compared with existing electrodes, the layered structure is simpler; 4. Using silver wire as the electrode wire not only utilizes its good electrical conductivity, flexibility, and ductility, but also can utilize its good biocompatibility; 5. The setting of the metal cap can protect the exposed electrode wire. On the one hand, during the process of penetrating in and out of the endoscope, it can avoid the friction or collision between the electrode wire and the endoscope cavity, so as not to damage the electrode wire. On the other hand, during the long-term discharge process, it can also protect the electrode wire and reduce its loss, which is beneficial to maintaining the discharge state of the electrode wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a partial schematic view of an electrode for a liquid-electric lithotripter with excellent comprehensive performance according to the present utility model;

[0021] Figure 2 FIG. is a cross-sectional structural schematic view of an electrode for a liquid-electric lithotripter according to the present utility model;

[0022] Figure 3 FIG. is a schematic view of a cavity hole inside an electrode for a liquid-electric lithotripter according to the present utility model;

[0023] Figure 4 FIG. is a structural schematic view of a metal cap on an electrode for a liquid-electric lithotripter according to the present utility model;

[0024] In the figure: 1. Electrode body; 2. Cavity hole; 3. Electrode wire; 4. Metal cap. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0026] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model.

[0027] As Figures 1 to 3 shown, an electrode for a liquid-electric lithotripter with excellent comprehensive performance includes an electrode body 1. The electrode body 1 is a PEEK catheter, and the PEEK catheter has two cavity holes 2, and the cavity holes 2 are arranged through along the length direction of the PEEK catheter; electrode wires 3 are respectively arranged in the cavity holes 2, and the electrode wires 3 respectively extend out of one end of the PEEK catheter.

[0028] The electrode for this liquid-electric lithotripter has a simple structure and excellent comprehensive performance. While having good insulation and high hardness performance, it also improves the overall stiffness of the electrode. When used in cooperation with an endoscope, during the process of the electrode body 1 penetrating into the endoscope, as the penetration distance increases, the difficulty of electrode penetration does not increase sharply, and during the penetration process, the electrode body 1 is not easily bent and blocked, and the penetration process is relatively smooth, and it will not cause the entire product to be unable to be used normally or even scrapped.

[0029] The electrode body 1 has both flexibility and hardness, and the overall stiffness is also good. On the one hand, during the threading process, it can withstand a certain amount of external force, maintain its original slender shape and transmit the force to the front end, so that it can move forward along the existing path, smoothly penetrate into the reserved cavity of the endoscope, and make the electrode head penetrate out. During the whole process, the PEEK catheter and the electrode wire can both remain intact without damage, so as to facilitate subsequent electrode operations.

[0030] On the other hand, the electrode body 1 and the electrode wires 3 inside it can bend along with the endoscope in the human body cavity to reach the lesion position. During this use process, the electrode body can exert its flexibility, good insulation and corrosion resistance, etc., and can well protect these two metal electrodes.

[0031] Using a PEEK catheter as the electrode body can give full play to the high mechanical strength of the PEEK material (it has rigidity and flexibility, especially outstanding fatigue resistance under alternating stress, comparable to alloy materials), high temperature resistance, impact resistance, acid and alkali resistance, hydrolysis resistance, fatigue resistance and insulation. Its corrosion resistance is reflected in that the PEEK material is insoluble in any solvent, strong acids and strong alkalis, and is hydrolysis resistant, with high chemical stability, enabling this electrode to maintain stable performance in the environment of body fluids and medicinal liquids. Its insulation can be maintained in a very high temperature range, and the dielectric loss is also very small at high frequencies, so that the electrode can be insulated from the surrounding substances on the path and can also discharge normally at the end of the electrode.

[0032] In addition, using a PEEK catheter as the electrode body enables it to have self-lubricating properties, suitable for occasions with strict requirements for low coefficient of friction and wear resistance applications, which can reduce the resistance of the electrode when penetrating into the endoscope, and there is no need to set a lubricating coating on its outer periphery. Compared with existing electrodes, the layered structure is simpler; the self-lubricating performance of PEEK modified by mixing a certain proportion of carbon fiber and graphite is better.

[0033] In this embodiment, the two electrode wires 3 are respectively a positive electrode wire and a negative electrode wire, arranged in a line; in practice, more electrode wires can also be set according to needs, and a cross or a square arrangement can be adopted.

[0034] Furthermore, the electrode wire 3 is a silver wire, and the two electrode wires extend from the same end of the PEEK catheter.

[0035] Using a silver wire as the electrode wire 3 not only takes advantage of its good electrical conductivity, flexibility and ductility, but also its good biocompatibility. Such an electrode in the human tissue cavity can reduce the stimulation and adverse reactions to human tissues. Selecting the same material for the positive and negative electrodes is also beneficial for generating the required electric arc and can be used in the electrohydraulic lithotripsy technology to break stones directionally.

[0036] In some embodiments, as Figure 4 shown, a metal cap 4 is also connected to the part of the electrode wire 3 extending from the end of the PEEK catheter. The setting of the metal cap 4 can protect the exposed electrode wire. On the one hand, during the process of penetrating in and out of the endoscope, it can avoid the friction or collision between the electrode wire 3 and the endoscope cavity, so as not to damage the electrode wire 3. On the other hand, it can also protect the electrode wire 3 during the long-term discharge process, reduce its loss, and is beneficial to maintaining the discharge state of the electrode wire. The metal cap 4 can be replaced after a certain usage period, which has a lower cost and is more convenient to replace compared with replacing the entire electrode wire.

[0037] Furthermore, the metal cap 4 is welded to the electrode wire 3. This connection method is relatively stable and can prevent the electrode cap from falling off during the movement and discharge processes. When disassembly is required, it can be desoldered and then replaced. The metal cap 4 is made of a material with excellent electrical conductivity such as a copper cap or a silver cap, so as not to affect the electrode discharge function.

[0038] Furthermore, both of the cavity holes 2 are arranged parallel to the central axis of the PEEK catheter, and the two cavity holes 2 are symmetrically arranged with respect to the central axis.

[0039] When manufacturing the PEEK catheter, the cavity holes 2 can be directly formed by injection molding, compression molding, extrusion molding or other methods. This method can also reduce the manufacturing difficulty of the entire electrode, avoid subsequent hole-opening processing, and there is no need to layer by layer wind or stack various materials on the electrode wire.

[0040] Furthermore, the connecting line of the centers of the two cavity holes 2 passes through the central axis of the PEEK catheter, and there is a spacing of 0.1 - 0.3 mm between the outer circumferences of the two cavity holes 2, so that there is also a spacing between the two electrode wires 3. By controlling the spacing, the discharge performance of the two can be adjusted. In this embodiment, the preferred spacing is 0.2 mm.

[0041] Furthermore, the diameter of the cavity hole 2 is 0.08 - 0.12 mm, the outer diameter of the PEEK catheter is 0.5 - 0.7 mm, and the diameter of the electrode wire 3 is not greater than the diameter of the cavity hole. For the entire electrode, once it is integrally formed and manufactured, the electrode wire 3 will not move relative to the cavity hole, so as to ensure that the extended part of the electrode wire remains unchanged.

[0042] In this embodiment, preferably, the diameter of the cavity hole 2 is 0.1 mm, and the outer diameter of the PEEK catheter is 0.6 mm.

[0043] Furthermore, the length of the metal cap 4 is slightly longer than the length of the extended part of the electrode wire 3. The length of the metal cap 4 is 3 - 5 mm, and preferably 4 mm in this embodiment.

[0044] Furthermore, the hardness of the PEEK catheter is not less than 75D, which refers to the hardness grade represented by Shore D, and it has a certain hardness and elasticity.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrode for a liquid electrohydraulic lithotriptor with excellent comprehensive performance, comprising an electrode body, characterized in that, The electrode body is a PEEK catheter, and the PEEK catheter has at least two cavity holes which are arranged through along the length direction of the PEEK catheter; electrode wires are respectively arranged in the cavity holes, and the electrode wires respectively extend out of one end of the PEEK catheter.

2. The electrode for a liquid electrohydraulic lithotriptor with excellent comprehensive performance according to claim 1, wherein The electrode wires are silver wires, and the two electrode wires extend out of the same end of the PEEK catheter.

3. The electrode for a liquid electrohydraulic lithotriptor with excellent comprehensive performance according to claim 1, wherein, A metal cap is further connected to the part of the electrode wire extending out of the end of the PEEK catheter.

4. The electrode for a liquid electrohydraulic lithotriptor with excellent comprehensive performance according to claim 3, characterized in that, The metal cap is connected to the electrode wire by welding, and the metal cap is a copper cap or a silver cap.

5. The electrode for a liquid electrohydraulic lithotripter with excellent comprehensive performance according to claim 1, characterized in that, Both of the two cavity holes are arranged parallel to the central axis of the PEEK catheter, and the two cavity holes are symmetrically arranged with respect to the central axis.

6. The electrode for a liquid electrohydraulic lithotripter with excellent comprehensive performance according to claim 1, characterized in that, The connection line of the centers of the two cavity holes passes through the central axis of the PEEK catheter, and there is a distance of 0.1-0.3 mm between the outer circumferences of the two cavity holes.

7. The electrode for a liquid electrohydraulic lithotriptor with excellent comprehensive performance according to claim 1, characterized in that, The diameter of the cavity hole is 0.08-0.12 mm, the outer diameter of the PEEK catheter is 0.5-0.7 mm, and the diameter of the electrode wire is not greater than the diameter of the cavity hole.

8. The electrode for a liquid electrohydraulic lithotriptor with excellent comprehensive performance according to claim 1 or 7, characterized in that, The diameter of the cavity hole is 0.1 mm, and the outer diameter of the PEEK catheter is 0.6 mm.

9. The electrode for a liquid electrohydraulic lithotripter with excellent comprehensive performance according to claim 3, characterized in that, The length of the metal cap is longer than the length of the part of the electrode wire extending out, and the length of the metal cap is 3-5 mm.

10. The electrode for a liquid electrohydraulic lithotriptor with excellent comprehensive performance according to claim 1, characterized in that, The hardness of the PEEK catheter is not lower than 75D.

Images