Multi-conducting resilient electrode and method of connecting same

Abstract

The present application relates to a kind of multi-conducting elastic electrode and its connecting method, the multi-conducting elastic electrode includes: first tube body and second tube body, first tube body is connected with second tube body with 2n wires, 2n wires respectively pass through the 2n peripheral lumen of first tube body and second tube body and around the central lumen of first tube body and second tube body;Filler tube, the filler tube is between first tube body and second tube body, and the axial position of filler tube is aligned with the axial position of first tube body and the axial position of second tube body;2n wires, 2n wires are around filler tube;Single cavity pipe, the single cavity pipe is wrapped around the end of first tube body close to filler tube, 2n wires between first tube body and second tube body and filler tube, and the end of second tube body close to filler tube;The first tube body, filler tube, second tube body and single cavity pipe are hot melt integrated.The present application avoids the emergence of short circuit and increases the durability of use.

Description

Technical Field

[0001] This invention relates to a multi-conducting elastic electrode and its connection method. Background Technology

[0002] Elastic electrodes for nerve stimulation are widely used in the treatment of various diseases. These electrodes need to be surgically implanted into different parts of the patient's body, such as the spine. Because they need to adapt to the deformation caused by the dynamic changes of different parts of the body, these electrodes require a high degree of flexibility. Currently, the most commonly used method for preparing implantable electrodes and connecting implantable electrode components is the perfusion method. This method first uses physical methods to weld wires to electrode rings, and then fills the electrode rings with glue to obtain an electrode. Then, the above steps are repeated and directly physically connected to create a stimulation electrode containing multiple electrodes. This method is relatively cumbersome, and the products produced lack flexibility, resulting in poor adaptability to the human body after implantation. At the same time, the connections between the various parts of the implanted electrode are prone to a series of problems such as internal wire breakage and short circuits after the overall electrode deforms.

[0003] The above description of the background technology is only for the purpose of facilitating a deeper understanding of the technical solution of the present invention (the technical means used, the technical problems solved, and the technical effects produced, etc.), and should not be regarded as an admission or implication in any form that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-conductivity elastic electrode and its connection method. The connection ends between the various parts of the multi-conductivity elastic electrode are integrally formed and have good flexibility, resulting in good adaptability to the human body after implantation. The connection method of the multi-conductivity elastic electrode is simpler compared to traditional methods. This connection method reduces the risk of short circuits caused by wires coming into contact with each other and the risk of wires becoming disconnected due to undesirable movement, thus strengthening the strength and conductivity of the wire connection.

[0005] This invention relates to a method for connecting multiple conductive elastic electrodes, the method comprising the following steps: 1) inserting a filler tube between a first tube and a second tube, the first tube and the second tube being connected by 2n wires, the 2n wires passing through 2n peripheral cavities of the first tube and the second tube respectively and surrounding the central cavity of the first tube and the second tube, such that the 2n wires surround the filler tube and the axis of the filler tube is aligned with the axis of the first tube and the axis of the second tube; 2) inserting a mandrel through the central cavity of the first tube, the filler tube, and the central cavity of the second tube so that the first tube, the filler tube, and the second tube come into contact in sequence; 3) wrapping the end of the first tube near the filler tube, the 2n wires between the first tube and the second tube, and the filler tube, as well as the end of the second tube near the filler tube, with a single-cavity tube; 4) connecting the first tube, the filler tube, the second tube, and the single-cavity tube to each other.

[0006] In one embodiment, step 1) further includes the following steps: a) providing a first tube and a second tube, each containing 2n+1 cavities extending along the axial direction of the tube, wherein a central cavity is located at the axis of the tube, and the remaining 2n peripheral cavities are distributed around the central cavity, where n is an integer greater than or equal to 1 and less than or equal to 8; b) making 2n cuts along the axial and circumferential directions of the tube in a predetermined cutting sequence and at a predetermined cutting interval on the outer walls of the first and second tubes, each cut exposing at least one peripheral cavity; c) inserting 2n wires into the 2n peripheral cavities of the first and second tubes respectively; d) picking out one end of each of the 2n wires from the 2n cuts on the outer wall of the first tube in a predetermined picking sequence and electrically connecting it to 2n head electrode rings respectively, and picking out the other end of each of the 2n wires from the 2n cuts on the outer wall of the second tube in a predetermined picking sequence and electrically connecting it to 2n tail electrode rings respectively.

[0007] In another embodiment, step d) further includes the following steps: d1) starting from the first incision furthest from the distal end of the first tube body, picking out one end of the first wire in the first peripheral lumen; d2) slipping a first end electrode ring onto the distal end of the first tube body, so that the first end electrode ring wraps around the first tube body and covers the first incision, and is electrically connected to the picked-out end of the first wire; d3) repeating steps d1) and d2) until the 2nth end electrode ring covers the 2nth incision of the first tube body and is electrically connected to the 2nth wire. d4) Starting from the first cut closest to the distal end of the second tube, pull out the other end of the first wire in the first peripheral lumen; d5) Put the first tail electrode ring on the proximal end of the second tube, so that the first tail electrode ring wraps around the second tube and covers the first cut, and is electrically connected to the other end of the first wire; d6) Repeat steps d4) and d5) until the 2n tail electrode ring covers the 2n cut of the second tube and is electrically connected to the other end of the 2n wire.

[0008] In another embodiment, the electrical connection between the electrode ring and the wire further includes the following steps: riveting a metal ring to the protruding end of the wire, wherein the riveted metal ring is arc-shaped and its curved surface is consistent with the inner surface of the electrode ring; and welding the metal ring to the inner surface of the electrode ring.

[0009] In another embodiment, step 4) includes: 4a) applying heat shrink tubing to the outside of the first tube, the single-lumen tube, and the second tube and heating it; 4b) peeling off the heat shrink tubing and removing the mandrel.

[0010] In another embodiment, the cross-section of the packing tube is polygonal.

[0011] In another embodiment, the first tube, the filler tube, the second tube, and the single-lumen tube are made of a material selected from thermoplastic elastomers and thermoplastic polyurethanes, the heat shrink tubing is made of perfluoroethylene-propylene copolymer, and the mandrel is made of stainless steel or nickel-titanium alloy wire with the mandrel surface coated with polytetrafluoroethylene.

[0012] Another aspect of the present invention relates to a multi-conductivity elastic electrode, the multi-conductivity elastic electrode comprising: a first tube and a second tube, the first tube and the second tube being connected by 2n wires, the 2n wires passing through 2n peripheral cavities of the first tube and the second tube respectively and surrounding the central cavity of the first tube and the second tube; a packing tube, the packing tube being located between the first tube and the second tube, and the axial position of the packing tube being aligned with the axial position of the first tube and the second tube; 2n wires, the 2n wires surrounding the packing tube; and a single-cavity tube, the single-cavity tube enclosing the end of the first tube near the packing tube, the 2n wires between the first tube and the second tube, the packing tube, and the end of the second tube near the packing tube; the first tube, the packing tube, the second tube, and the single-cavity tube are thermally fused together.

[0013] In one embodiment, the first tube and the second tube each contain 2n+1 cavities extending along the axial direction of the tube, one of which is a central cavity located at the axis of the tube, and the remaining 2n peripheral cavities are distributed around the central cavity, where n is an integer greater than or equal to 1 and less than or equal to 8, and the 2n wires are respectively inserted into the 2n peripheral cavities of the first tube and the second tube.

[0014] In another embodiment, the first tube and the second tube each include: 2n slits formed on the outer wall of the tube in a predetermined order and at predetermined intervals along the axial and circumferential directions of the tube, each slit exposing an outer peripheral cavity; 2n wires inserted into the 2n outer peripheral cavities of the first tube and the second tube respectively and each having an exposed end passing through the slits on the outer peripheral cavity; and 2n electrode rings sequentially and alternately fitted onto the outer wall of the tube and respectively covering the 2n slits, thereby electrically connecting to the exposed ends of the 2n wires respectively.

[0015] In another embodiment, the wire is electrically connected to the corresponding electrode ring via a terminal.

[0016] In another embodiment, the terminal is a metal ring riveted into an arc shape, the curved surface of which is consistent with the inner surface of the electrode ring and welded to the inner surface of the electrode ring.

[0017] In another embodiment, the multi-conducting elastic electrode is provided with a marker ring, which is closer to the proximal end of the multi-conducting elastic electrode relative to the signal receiving plate.

[0018] In another embodiment, the distal end of the multi-conducting elastic electrode is formed into a hemispherical shape.

[0019] In another embodiment, a positioning anchor is provided on the outside of the multi-conductive elastic electrode. Attached Figure Description

[0020] Figure 1a A partial perspective view of the tube and wire according to the present invention is shown; Figure 1b A partial perspective view of the tube body, packing tube, and wire according to the present invention is shown; Figure 2 A schematic cross-sectional view of the packing tube and wire according to the present invention is shown; Figure 3 A partial perspective view of the tube body according to the present invention is shown; Figure 4 A partial perspective view of the tube body and the protruding end of the wire according to the present invention is shown; Figure 5a A perspective view of the wire and metal ring according to the present invention is shown; Figure 5b A perspective view of the wire and the riveted metal ring according to the present invention is shown; Figure 5c An enlarged perspective view of the wire and the riveted metal ring according to the present invention is shown; Figure 5d A perspective view of the wire, the riveted metal ring, and the electrode ring according to the present invention is shown; Figure 6a A partial perspective view of the mandrel, packing tube, and wire according to the present invention is shown; Figure 6b A partial perspective view of the mandrel, packing tube, wire, and single-lumen tube according to the present invention is shown; Figure 7 An overall diagram of the multi-conducting elastic electrode according to the present invention is shown.

[0021] List of reference numerals in the attached diagram: 100: First tube body 111: First conductor 112: Second conductor 113: Third conductor 120: Central lumen 121: First peripheral lumen 122: Second peripheral lumen 123: Third peripheral lumen 131: First incision 132: Second incision 133: Third incision 141: The protruding end of the first conductor 142: The protruding end of the second conductor 151: Metal Ring 161: First electrode ring 200: Second tube body 300: Packing tube 400: Spindle 500: Single-lumen tube. Detailed Implementation

[0022] The inventive concept of this invention includes multiple specific embodiments, each with its own technical or application focus. These embodiments can be combined to meet different application scenarios and solve different application needs. Therefore, the following description of specific embodiments should not be construed as a limitation on the technical solutions intended to be protected by this invention.

[0023] In the following description, various exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0024] First, in order to more clearly describe the embodiments of the present invention, the terms "proximal end" and "distal end" need to be defined.

[0025] When a physician is performing a routine procedure with a tool or instrument (such as forceps) in front of a patient, and the tool or instrument (such as forceps) is positioned between the physician and the patient, the end closer to the physician is called the "proximal end," and the end farther from the physician (the end closer to the patient) is called the "distal end." In other words, for example, when a physician holds a syringe to give an injection to a patient, the tail end of the syringe (the part where the physician presses with their thumb) can be called the "proximal end," and the needle tip can be called the "distal end."

[0026] Furthermore, "head electrode rings" refer to all electrode rings closer to the patient relative to the packing tube, while "tail electrode rings" refer to all electrode rings closer to the physician relative to the packing tube. Therefore, if the first tube is closer to the patient relative to the packing tube and the second tube is closer to the physician relative to the packing tube, then "head electrode rings" refer to all electrode rings on the first tube, and "tail electrode rings" refer to all electrode rings on the second tube. Following the direction from the physician towards the patient, the "head electrode rings" are sequentially designated as the first head electrode ring, the second head electrode ring, ..., and the 2nth head electrode ring; similarly, following the direction from the patient towards the physician, the "tail electrode rings" are sequentially designated as the first tail electrode ring, the second tail electrode ring, ..., and the 2nth tail electrode ring.

[0027] The above definitions of "proximal end" and "distal end", as well as "head electrode ring" and "tail electrode ring" are only for the convenience of describing the embodiments of the present invention, and do not limit the structure of the present invention.

[0028] The term "axial direction" refers to a direction that is substantially parallel to the axis of the pipe body.

[0029] The term "circumferential direction" refers to a direction that is essentially perpendicular to both the axial direction and the radius of the tube's cross-section, i.e., the circumferential direction around the tube's axis.

[0030] The statement "A and B are consistent" means that A and B are basically equal, with a maximum allowable deviation of ±5%.

[0031] This invention relates to a method for connecting multiple conductive elastic electrodes, the method comprising the following steps: 1) A packing tube is placed between the first tube and the second tube. The first tube and the second tube are connected by 2n wires. The 2n wires pass through 2n outer cavities of the first and second tubes respectively and surround the central cavity of the first and second tubes, so that the 2n wires surround the packing tube and the axis of the packing tube is aligned with the axis of the first and second tubes. For example Figure 1a As shown, the first tube 100 and the second tube 200 have the same structure, and the eight wires contained therein pass through eight corresponding outer peripheral cavities of the first tube 100 and the second tube 200, respectively. These eight wires (such as the first wire 111, the second wire 112, the third wire 113, etc.) extend along the axial direction of the tubes and are distributed around the central positions of the first tube 100 and the second tube 200. Figure 1b As shown, the inserted filler tube 300 is located between the first tube body 100 and the second tube body 200 (not shown in the figure). Eight wires surround the filler tube 300, and the axis of the filler tube 300 is aligned with the axis of the first tube body 100 and the axis of the second tube body 200 (i.e., the central lumen). The first tube body 100 and the second tube body 200 can be made of medical-grade materials such as thermoplastic polyurethane (TPU) and thermoplastic elastomer (TPE). Such tubes are manufactured using special molds and are heated and stretched. Therefore, such tubes have good thermoplasticity and elasticity. The outer diameter of the first tube body 100 and the second tube body 200 is 1 mm to 3 mm, preferably 1.1 mm to 2.5 mm. The inner diameter of the central lumen 120 of the first tube body 100 and the second tube body 200 is 0.3 mm to 0.7 mm, preferably 0.4 mm to 0.6 mm. The inner diameters of the outer peripheral cavities 101, 102, 103, etc. of the first tube 100 and the second tube 200 are 0.1 mm to 0.3 mm.

[0032] The outer contour of the inserted stuffing tube 300 cross-section is polygonal, therefore, each face of the polygonal stuffing tube can preferably be used to uniformly separate the wires. For example... Figure 2 As shown, the cross-section of the packing tube 300 is square. Two wires are placed on each side of the cross-section of the packing tube 300. For example, the first wire 111 and the second wire 112 are placed on the top side of the cross-section of the packing tube 300, so that the eight wires are spaced apart from each other. This placement method of the wires and the packing tube can avoid mutual crossing and entanglement between the wires during the manufacturing process and after the finished product.

[0033] The packing tube 300 is made of medical-grade thermoplastic polyurethane material through stretching using a special mold during heating. When the packing tube has a square cross-section, the side length is 0.6 mm to 5 mm, and the inner diameter is 0.3 mm to 4.5 mm, preferably 0.8 mm to 4.5 mm, and the inner diameter is 0.5 mm to 4.0 mm. Step 1 above can be divided into the following steps: a) Provide a first tube and a second tube, each containing 2n+1 cavities extending along the axial direction of the tube, with one central cavity located at the axis of the tube and the remaining 2n peripheral cavities distributed around the central cavity, where n is an integer greater than or equal to 1 and less than or equal to 8. For example Figure 1a and 1b As shown, the first tube 100 and the second tube 200 each contain nine cavities extending along the axial direction of the tube. One central cavity 120 is located at the axial center of both the first tube 100 and the second tube 200. The remaining eight peripheral cavities (such as the first peripheral cavity 121, the second peripheral cavity 122, the third peripheral cavity 123, etc.) are distributed around the central cavity 120. The peripheral cavities with the same number in the first tube 100 and the second tube 200 are all axially opposite each other and contain the same conductor. For example, the first peripheral cavity 121 of the first tube 100 and the first peripheral cavity of the second tube 200 (not shown in the figure) are axially opposite each other and contain the same first conductor 111.

[0034] b) Make 2n cuts along the axial and circumferential directions of the first and second tube bodies in a predetermined cutting sequence and at predetermined cut intervals on the outer walls of the tube bodies, with each cut exposing at least one peripheral lumen. For example... Figure 3 As shown, eight cuts are made on the outer wall of the first tube 100 along the axial and circumferential directions of the first tube 100 in a predetermined cutting sequence and at predetermined cutting intervals. Figure 3 Only three are shown in the image, such as the first incision 131, the second incision 132, and the third incision 133 starting from the proximal end. Each incision exposes at least one peripheral lumen, and the eight incisions expose at least eight corresponding peripheral lumens. This step can be performed on a specially designed rotary pipe cutting fixture. In this step, after each incision, the pipe is rotated at a predetermined angle in the circumferential direction and displaced in the axial direction before the next cut, so that adjacent incisions are offset from each other in the circumferential and axial directions. Preferably, the angle difference between the (m+1)th incision and the mth incision in the circumferential direction of the pipe is _____. Where m is an integer greater than or equal to 1 and less than 2n. The predetermined axial cutting sequence in this step is from one end of the tube to the other. For example, from the proximal end to the distal end of the first tube 100. The distance between the (m+1)th cut and the mth cut in the axial direction of the tube is 0.5 mm to 20 mm, preferably 1 mm to 18 mm. In this step, each cut is made such that each cut exposes at least one peripheral lumen, but not the central lumen.

[0035] When making cuts in the second tube 200, the axial order of the cuts is the reverse of the axial order of the cuts in the first tube 100. For example, if the first tube 100 is cut from the proximal end to obtain a first cut 131, a second cut 132, and a third cut 133, then the second tube 200 is cut from the distal end to obtain a first cut, a second cut, and a third cut (not shown in the figures). The circumferential cuts in the second tube 200 are also consistent with the circumferential cuts in the first tube 100. That is, preferably, the angle difference between the (m+1)th cut and the mth cut on the second tube 200 in the circumferential direction is... The distance between the (m+1)th cut and the mth cut in the axial direction of the tube is 0.5 mm to 20 mm, preferably 1 mm to 18 mm. In this step, each cut is made such that each cut exposes at least one peripheral lumen, but the central lumen must not be exposed.

[0036] The cuts made to the first pipe body 100 and the second pipe body 200 can be made simultaneously or separately, and can be completed on the same or different specially designed rotary pipe cutting fixtures. Preferably, the cuts made to the first pipe body 100 and the second pipe body 200 are made alternately on the same specially designed rotary pipe cutting fixture to maintain the stability and similarity of the position and depth of the cuts on the first pipe body 100 and the second pipe body 200.

[0037] c) Insert 2n wires into the 2n outer cavities of the first and second tubes, respectively. For example... Figure 1a As shown, a first lead 111 is inserted into the first peripheral lumen 121 of the corresponding first tube 100 and the first peripheral lumen of the second tube 200 (not shown in the figure). The lead can be made of a medical-grade, NMR-compliant, and low-resistance metallic material, such as platinum-iridium alloy, MP35N, or silver alloy. Each lead has a diameter of 0.1 mm to 1 mm and a length of 10 cm to 400 cm, preferably a diameter of 0.12 mm to 0.88 mm and a length of 12 cm to 95 cm.

[0038] d) From the 2n incisions on the outer wall of the first tube, pull out one end of each of the 2n wires in a predetermined order and electrically connect them to the 2n head electrode rings respectively. From the 2n incisions on the outer wall of the second tube, pull out the other end of each of the 2n wires in a predetermined order and electrically connect them to the 2n tail electrode rings respectively. Step d) can be divided into the following steps: d1) Starting from the first incision furthest from the distal end of the first tube body, pick out one end of the first wire from the first peripheral lumen. For example... Figure 4 As shown, starting from the first incision 131 furthest from the first end of the first tube 100, the protruding end 141 of the first wire 111 in the first peripheral cavity 121 of the first tube 100 is picked out.

[0039] d2) The first end electrode ring is fitted onto the distal end of the first tube body, so that the first end electrode ring surrounds the first tube body and covers the first cut, and is electrically connected to the protruding end of the first wire. The electrical connection between the electrode ring and the wire further includes the following steps: riveting a metal ring to the protruding end of the wire, wherein the riveted metal ring is arc-shaped and its curved surface is consistent with the inner surface of the electrode ring; welding the metal ring to the inner surface of the electrode ring.

[0040] For example Figures 5a to 5d As shown, a first electrode ring 161 is fitted onto the distal end of the first tube 100, so that the first electrode ring 161 surrounds the first tube 100 and covers the first cut 131, and is electrically connected to the protruding end 141 of the first wire 111. Preferably, the inner diameter of the first electrode ring 161 is slightly larger than the diameter of the first tube 100. To facilitate the electrical connection between the protruding end 141 of the first wire 111 and the first electrode ring 161, those skilled in the art can adjust the length of the protruding wire as needed. This step can be divided into the following steps: d2a) such as Figure 5a As shown, firstly, a metal ring 151 is fitted onto the protruding end 141 of the first wire 111 in the first outer peripheral cavity 121, and then the metal ring 151 is riveted. The outer diameter of the metal ring 151 is 0.3 mm to 3 mm, the wall thickness is 0.01 mm to 1 mm, and the length is 0.5 mm to 10 mm, preferably 0.8 mm to 2.5 mm, the wall thickness is 0.1 mm to 0.8 mm, and the length is 0.8 mm to 8 mm. Figure 5bAs shown, the riveted metal ring 151 is arc-shaped, and its curved surface matches the inner surface of the first electrode ring 161. The metal ring 151 is made of a medical-grade, NMR-compatible metal material, such as platinum-iridium alloy or titanium alloy, and is machined to specific dimensions. In some embodiments, the riveted metal ring 151 can also be other shapes that increase the surface area of ​​the welding point between the wire and the electrode ring. In other embodiments, other metal materials that can increase the surface area of ​​the welding point between the wire and the electrode ring can be used, or the metal ring can be riveted into other shapes that can increase the surface area of ​​the welding point between the wire and the electrode ring. For example, small metal sheets of various shapes can be introduced; d2b) such as Figure 5c and Figure 5d As shown, the riveted metal ring 151 is welded to the inner surface of the first electrode ring 161. Then, the first electrode ring 161 is fitted onto the first tube 100 from the distal end of the first tube 100, covering the first cut 131. This completes the electrical connection between the first wire 111 and the first electrode ring 161. The welding method for this step can be selected from soldering, resistance welding, and laser welding. d3) Repeat steps d1) and d2) until the 2n-end electrode ring covers the 2n-end cut of the first tube and is electrically connected to the protruding end of the 2n-end wire. For example, repeat steps d1) and d2) until the 8th electrode ring of the first tube 100 covers the 8th cut of the first tube 100 from the proximal end to the distal end and is electrically connected to the protruding end of the 8th end wire.

[0041] d4) Starting from the first incision closest to the distal end of the second tube body, pick out the other end of the first wire in the first peripheral lumen. For example, starting from the first incision closest to the distal end of the second tube body 200, pick out the other end of the first wire 111 in the first peripheral lumen.

[0042] d5) The first tail electrode ring is fitted onto the proximal end of the second tube body, so that the first tail electrode ring wraps around the second tube body and covers the first cut, and is electrically connected to the other end of the first wire. For example, the first tail electrode ring is fitted onto the proximal end of the second tube body 200, so that the first tail electrode ring wraps around the second tube body 200 and covers the first cut, and is electrically connected to the other end of the first wire 111.

[0043] d6) Repeat steps d4) and d5) until the 2n tail electrode ring covers the 2n cut of the second tube and is electrically connected to the other end of the 2n wire. For example, repeat steps d4) and d5) until the 8th tail electrode ring covers the 8th cut of the second tube 200 from the distal end to the proximal end and is electrically connected to the other end of the 8th wire. In some embodiments, steps d4), d5) and d6) are the same steps as steps d1), d2) and d3) performed at corresponding positions on the second tube 200, so the parts that are the same as steps d1), d2) and d3) will not be described again here.

[0044] 2) Insert the mandrel through the central cavity of the first tube, the packing tube, and the central cavity of the second tube so that the first tube, the packing tube, and the second tube come into contact in sequence. For example Figure 6a As shown, a mandrel 400 is inserted through the central cavity 120 of the first tube 100, the packing tube 300, and the central cavity of the second tube 200, causing the first tube 100, the packing tube 300, and the second tube 200 to contact each other sequentially. Because the mandrel 400 supports and retains the central cavities 120 of the first tube 100 and 200, the diameter of the mandrel 400 is less than or equal to the diameter of the central cavity 120. Preferably, those skilled in the art can select a diameter for the mandrel 400 that facilitates insertion into the central cavity 120 and is sufficient to support the first tube 100 and the second tube 200. Since the mandrel 400 is cylindrical, the packing tube 300 may undergo slight deformation after insertion. The mandrel 400 is made of stainless steel or nickel-titanium alloy wire, and its surface may or may not be coated with polytetrafluoroethylene (PTFE). The polytetrafluoroethylene coating can prevent the mandrel 400 from sticking to the central cavity 120 of the first tube 100 and the central cavity of the second tube 200 during the heat shrinking process, which is beneficial for the subsequent removal of the mandrel 400.

[0045] 3) Wrap the end of the first tube near the packing tube, the 2n wires and packing tube between the first and second tubes, and the end of the second tube near the packing tube with a single-lumen tube. For example... Figure 6b As shown, a single-lumen tube 500 encloses the end of the first tube 100 near the packing tube 300, eight wires between the first tube 100 and the second tube 200, the packing tube 300, and the end of the second tube 200 near the packing tube 300 (not shown in the figure). The single-lumen tube is made of medical-grade thermoplastic polyurethane material by stretching it using a special mold during heating. The outer diameter of the single-lumen tube is 1.0 mm to 5.5 mm, and the wall thickness is 0.1 mm to 2 mm, preferably 1.2 mm to 5.0 mm, and the wall thickness is 0.15 mm to 1.95 mm.

[0046] 4) Connect the first tube body, the packing tube, the second tube body, and the single-lumen tube to each other. This step can be divided into the following steps: 4a) Apply heat-shrink tubing to the outside of the first tube body, the single-lumen tube, and the second tube body, and heat them. In this step, the heat-shrink tubing covers all structures, namely: the eight electrode rings on each of the first tube body 100 and the second tube body 200, the outer walls of the first tube body 100 and the second tube body 200 not covered by the electrode rings, and the single-lumen tube 500. Select the size of the heat-shrink tubing so that its inner diameter is larger than the outer diameter of the electrode rings, the tube body, and the single-lumen tube, and select the material of the heat-shrink tubing so that its heat-shrinking temperature is greater than the melting point of the materials of the tube body, the filler tube, and the single-lumen tube. Heat the heat-shrink tubing to a temperature greater than or equal to its heat-shrinking temperature. During heating, a localized annular heating device is used. The heating device remains stationary, while the first tube body, the single-lumen tube, and the second tube body are moved to slowly heat the entire structure covered with heat-shrink tubing separately. The heat-shrink tubing shrinks, and the materials of the tubing body, filler tube, and single-lumen tube melt, reducing the diameter of all outer lumens of the first tubing body 100 and the second tubing body 200 to the same size as the outer diameter of each wire. This achieves the effect of tightly wrapping the corresponding wires within each outer lumen. Similarly, in the portion wrapped by the single-lumen tube, the molten single-lumen tube and filler tube fill the gaps between the eight wires, achieving the effect of tightly wrapping all wires. The gaps between the eight head electrode rings and the outer wall of the first tubing body 100, and between the eight tail electrode rings and the outer wall of the second tubing body 200, are also filled with the molten tubing material, achieving a tight fit between the eight head electrode rings and the first tubing body 100, and between the eight tail electrode rings and the outer wall of the second tubing body 200. The gap between the central lumen 120 and the mandrel 400 is also filled with the heat-shrinked tubing material. The first tubing body 100, the second tubing body 200, and the single-lumen tube 500 between them are also fused together due to the compression and filling of the above structure. The heat shrink tubing is made of perfluoroethylene-propylene copolymer. The heat shrink tubing has an outer diameter of 1.6 mm to 6.5 mm and a wall thickness of 0.1 mm to 2 mm, preferably an outer diameter of 1.65 mm to 6.0 mm and a wall thickness of 0.15 mm to 1.95 mm. In some cases, depending on the required size of the multi-conducting elastic electrode, different heat shrink tubing can be used to heat shrink it multiple times.

[0047] 4b) Peel off the heat shrink tubing and remove the mandrel. After cooling the first tube body 100, the eight head electrode rings on the first tube body 100, the second tube body 200, the eight tail electrode rings on the second tube body 200, the single-lumen tube, and the heat shrink tubing to fix the shape of the overall structure, the heat shrink tubing can be peeled off and the mandrel 400 can be removed. At this time, the central cavity 120 of the first tube body 100 and the central cavity of the second tube body 200 are hollow cavities, and their shapes are maintained by the presence of the mandrel 400 during the heat shrinking process. Due to the presence of the mandrel 400 and the heat shrinking process, the interior of the filler tube 300 also forms a hollow shape corresponding to the central cavity 120 of the first tube body 100 and the central cavity of the second tube body 200.

[0048] Preferably, after step 4b), the distal end of the first tube 100 needs to be sealed. In this step, the distal end of the first tube 100 is heat-softened and cooled to fix it in order to seal the distal end.

[0049] A multi-conductivity elastic electrode of the present invention can be prepared by the above method. The multi-conductivity elastic electrode includes: a first tube and a second tube, the first tube and the second tube being connected by 2n wires, the 2n wires passing through 2n peripheral cavities of the first tube and the second tube respectively and surrounding the central cavity of the first tube and the second tube; a packing tube, the packing tube being located between the first tube and the second tube, and the axis of the packing tube being aligned with the axis of the first tube and the axis of the second tube; 2n wires, the 2n wires surrounding the packing tube; a single-cavity tube, the single-cavity tube enclosing the end of the first tube near the packing tube, the 2n wires between the first tube and the second tube, the packing tube, and the end of the second tube near the packing tube; the first tube, the packing tube, the second tube, and the single-cavity tube are heat-fused together.

[0050] The first tube and the second tube each contain 2n+1 cavities extending along the axial direction of the tube, one of which is a central cavity located at the axis of the tube, and the remaining 2n peripheral cavities are distributed around the central cavity, where n is an integer greater than or equal to 1 and less than or equal to 8. The 2n wires are respectively inserted into the 2n peripheral cavities of the first tube and the second tube.

[0051] The first tube and the second tube each include: 2n slits formed on the outer wall of the tube in a predetermined order and at predetermined intervals along the axial and circumferential directions, with each slit exposing an outer peripheral cavity; 2n wires inserted into the 2n outer peripheral cavities of the first and second tubes respectively and each having an exposed end passing through the slits on the outer peripheral cavity; and 2n electrode rings sequentially and alternately fitted onto the outer wall of the tube and covering the 2n slits respectively, thereby electrically connecting to the exposed ends of the 2n wires respectively.

[0052] For example Figure 1a As shown, the first tube 100 and the second tube 200 are connected by eight wires (such as the first wire 111, the second wire 112, the third wire 113, etc.). These eight wires pass through eight peripheral cavities of the first tube 100 and the second tube 200 and surround the central cavity 120 of the first tube 100 and the second tube 200. Figure 1b As shown, the packing tube 300 is located between the first tube body 100 and the second tube body 200, and the axis of the packing tube 300 is aligned with the axis of the first tube body 100 and the axis of the second tube body 200. The eight wires surround the packing tube 300. Figure 6b As shown, the single-lumen tube 500 encloses the end of the first tube body 100 near the packing tube 300, the eight wires between the first tube body 100 and the second tube body 200, the packing tube 300, and the end of the second tube body 200 near the packing tube 300. The first tube body 100, the packing tube 300, the second tube body 200, and the single-lumen tube 500 are heat-fused together.

[0053] like Figure 1a As shown, the first tube 100 and the second tube 200 each contain nine cavities extending along the axial direction of the tube. One central cavity (e.g., central cavity 120) is located at the axial center of the first tube 100, and the other eight peripheral cavities are distributed around the central cavity 120. The eight wires are respectively inserted into the eight peripheral cavities of the first tube 100 and the second tube 200.

[0054] like Figure 4 As shown, the first tube 100 and the second tube 200 each include eight incisions. These eight incisions are formed on the outer walls of the first tube 100 and the second tube 200 in a predetermined order and at predetermined intervals along the axial and circumferential directions of the tubes. Each incision exposes an outer peripheral lumen; for example, the first incision 131 exposes a first outer peripheral lumen 121. Eight wires are respectively inserted into the eight outer peripheral lumens of the first tube 100 and the second tube 200 and each has an exposed end passing through an incision in the outer peripheral lumen; for example, the first wire 111 has a protruding end 141 passing through the first incision 131. Figure 7 As shown, each of the first tube 100 and the second tube 200 has eight electrode rings that are sequentially and alternately fitted onto the outer wall of the tube and cover eight cuts, thereby electrically connecting to the exposed ends of eight wires respectively.

[0055] Furthermore, the multi-conductivity elastic electrode can be equipped with a marker ring, located near the proximal end of the electrode. The outer side of the marker ring (the side closest to the proximal end) can be shortened as needed, but the inner side (the side closest to the distal end) cannot be shortened. The distal end of the multi-conductivity elastic electrode can be hemispherical to facilitate electrode insertion into the spinal cavity and sealing. A positioning anchor can be provided on the outer side of the multi-conductivity elastic electrode. The function of the positioning anchor is to suture and fix it to the intervertebral ligament tissue with sutures to prevent the electrode from shifting after implantation.

[0056] The advantages of the above-described method of the present invention and the multi-conductivity elastic electrode manufactured by the method are as follows: 1) By simultaneously arranging 2n wires in the 2n outer cavities of the tube, the wires are fully isolated from each other and there is no risk of contact, thus avoiding signal interference; although the wires themselves are insulated enameled wires and will not conduct electricity when in contact with each other, the friction or pressure during the use of the electrodes increases the risk of short circuits. The design of this invention reduces the mutual friction of the wires during use, avoids the occurrence of short circuits, and increases the durability of use; in addition, since the wires are not twisted and the distance is shortest, the aesthetics are improved and the impedance is reduced; 2) It does not require the conventional perfusion method used in existing technologies. The method is simpler to operate and the product is more flexible. When implanted into the human body, it can adapt well to the corresponding parts of the human body. 3) The tube body of the multi-conducting elastic electrode is integrally molded, which improves the product strength. After heat shrinking treatment, the outer periphery of the tube body tightly wraps the wire, preventing the wire from moving undesirably in the outer periphery and detaching from the electrode ring. 4) After heat shrinking treatment, the gap between the electrode ring and the outer wall of the tube is filled by the molten tube material, which prevents the electrode ring from moving undesirably on the outer wall of the tube and from becoming disconnected from the wire. 5) After heat shrinking, the gaps between the tube body, the filler tube, and the single-lumen tube are filled with material, which effectively reduces the risk of the entire electrode failing due to leakage of body fluids (blood, tissue fluid, etc.) and contact with internal wires after the electrode is implanted in the human body. 6) Because a polygonal cross-section filler tube is used, the wire portion located between the first tube and the second tube can be evenly distributed around the outer periphery of the filler tube, which can avoid mutual cross-entanglement or accidental short circuit between wires during the manufacturing process and after the finished product. 7) Since the materials used as conductors, such as MP35N, have poor weldability, it is even more difficult to ensure the strength of the weld if the weld point is small. By introducing a riveted metal ring between the conductor and the electrode ring, the contact area of ​​the welded part can be significantly increased, thereby enhancing the weld strength.

[0057] Example 1 Two 9-hole tubes are provided, with one central lumen located at the axis of the 9-hole tube, and the remaining eight peripheral lumen are evenly distributed around the central lumen. The tubes are made of thermoplastic polyurethane. The outer diameter of the tube is 1.3 mm, the inner diameter of each peripheral lumen is 0.21 mm, and the inner diameter of the central lumen is 0.51 mm.

[0058] Eight cuts are made on the outer walls of the two tubes along the axial and circumferential directions in a predetermined cutting sequence and at predetermined cutting intervals, with each cut exposing at least one peripheral lumen.

[0059] First, each tube is placed on a specially designed cutting fixture, on which it can move freely in both the axial and circumferential directions. After determining the proximal and distal ends of the tube, a first cut is made arbitrarily on the outer wall of the proximal end of the first tube. Subsequently, on the tooling, the first tube body can be rotated 45° clockwise in the circumferential direction and moved 7 mm axially towards the distal end to select the second cut position. Then, the first tube body can be rotated 90° counterclockwise in the circumferential direction and moved 7 mm axially towards the distal end to select the third cut position. Next, the first tube body can be rotated 135° clockwise in the circumferential direction and moved 7 mm axially towards the distal end to select the fourth cut position. Then, the first tube body can be rotated 180° counterclockwise in the circumferential direction and moved 7 mm axially towards the distal end to select the fifth cut position. Then, the first tube body can be rotated 225° clockwise in the circumferential direction and moved 7 mm axially towards the distal end to select the sixth cut position. Then, the first tube body can be rotated 270° counterclockwise in the circumferential direction and moved 7 mm axially towards the distal end to select the seventh cut position. Finally, the first tube body can be rotated 315° clockwise in the circumferential direction and moved 7 mm axially towards the distal end to select the seventh cut position. After mm, select the eighth position for the incision. Similarly, make an incision on the second tube. The incision steps are the same as those for the first tube, but in the opposite direction, starting from the distal end to the proximal end of the second tube. In this step, each incision is 0.3 mm deep and parallel to the circumferential direction of the tube.

[0060] One wire is inserted into each corresponding outer circumferential cavity of the two tubes, such that the wires are substantially parallel to the axial direction of the tubes and do not cross each other. The wires are made of MP35N material. Each wire has a diameter of 0.15 mm.

[0061] Starting from the first incision furthest from the distal end on the first tube body, one end of the first conductor in the first peripheral lumen is pulled out. A metal ring is riveted to the pulled-out end of the first conductor in the first peripheral lumen, wherein the riveted metal ring is arc-shaped and its curved surface is consistent with the inner surface of the electrode ring. The metal ring is made of platinum-iridium alloy. The outer diameter of the metal ring is 0.33 mm, the inner diameter is 0.21 mm, and the length is 1.5 mm. The riveted metal ring is resistance welded to the inner surface of the first end electrode ring. Then, the first end electrode ring is fitted onto the first tube body from the distal end of the first tube body and covers the first incision, thereby completing the electrical connection between the first conductor and the first end electrode ring. The above steps are repeated from the proximal end to the distal end to pull out the wire, weld the electrode ring and the conductor, until the 8th end electrode ring covers the 8th incision from the proximal end to the distal end of the first tube body and is electrically connected to the pulled-out end of the 8th conductor.

[0062] Starting from the first incision closest to the distal end on the second tube body, the other end of the first conductor in the first peripheral cavity is pulled out. A metal ring is riveted to the pulled-out end of the first conductor in the first peripheral cavity of the second tube body, wherein the riveted metal ring is arc-shaped and its curved surface is consistent with the inner surface of the electrode ring. The metal ring is made of platinum-iridium alloy. The outer diameter of the metal ring is 0.33 mm, the inner diameter is 0.21 mm, and the length is 1.5 mm. The riveted metal ring is resistance welded to the inner surface of the first tail electrode ring. Then, the first tail electrode ring is fitted onto the second tube body from the proximal end of the second tube body and covers the first incision, thereby completing the electrical connection between the first conductor and the first tail electrode ring. The above steps are repeated from the distal end to the proximal end to pull out the wire, weld the electrode ring and the conductor, until the 8th tail electrode ring covers the 8th incision from the distal end to the proximal end of the second tube body and is electrically connected to the pulled-out end of the 8th conductor.

[0063] Subsequently, a filler tube is inserted between the first and second tubes, so that the portions of the 2n wires between the first and second tubes wrap around the filler tube, with the axis of the filler tube aligned with the axes of the first and second tubes. A mandrel is then inserted into the central cavity of the first tube, the filler tube, and the central cavity of the second tube, ensuring that the first, filler, and second tubes come into sequential contact. In this step, the mandrel extends through the entire length of the multi-conductive elastic electrode. The diameter of the mandrel is 0.50 mm. The mandrel is made of stainless steel and its surface is coated with polytetrafluoroethylene (PTFE).

[0064] Each electrode ring is made to completely cover its corresponding cut, and the eight electrode rings on each tube are pre-compressed to reduce their diameter. The eight electrode rings on each tube are then forged so that the outer diameter of the electrode ring matches the outer diameter of the tube, and each electrode ring is fixed to the outer wall of the tube by forging.

[0065] A single-lumen tube is used to enclose the end of the first tube near the packing tube, the 2n wires and packing tube between the first and second tubes, and the end of the second tube near the packing tube. The single-lumen tube has an outer diameter of 2.3 mm and an inner diameter of 1.7 mm.

[0066] Heat shrink tubing is applied, either entirely or partially, to the eight electrode rings on each of the two tube bodies, the outer wall of the tube body not covered by the electrode rings, and the outer wall of the single-lumen tube, depending on the actual situation. The tubing is then slowly heated to a temperature greater than or equal to the heat shrinking temperature of the heat shrink tubing. At this temperature, the heat shrink tubing shrinks, and the materials of the two tube bodies, the filler tube, and the single-lumen tube melt, causing all the outer cavities of the first and second tube bodies to tightly wrap their corresponding wires. The molten single-lumen tube and filler tube fill the gaps between the eight wires to tightly wrap all the wires. The gaps between the eight head electrode rings and the outer wall of the first tube body, and between the eight tail electrode rings and the outer wall of the second tube body, are also filled by the molten tubing material, ensuring a tight fit between the electrode rings and the outer wall of the tube body. The first and second tube bodies and the single-lumen tube between them also fuse together due to the compression and filling of the above structure. Afterward, the heat shrink tubing and the two tube bodies, the single-lumen tube, and the electrode rings it wraps are cooled. The heat shrink tubing is made of perfluoroethylene-propylene copolymer. The outer diameter of the heat shrink tubing is 2.8 mm, and the wall thickness is 0.2 mm. The heat shrink tubing is then peeled off, and the mandrel is extracted. Finally, the distal end of the first tube is heat-softened and cooled to seal the end.

[0067] Although the invention has been described with reference to the accompanying drawings and embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and not limited to the exemplary embodiments disclosed herein. Accordingly, it should be noted that such changes or modifications fall within the scope of the claims of the invention, and the scope of the invention should be interpreted based on the appended claims.

Claims

1. A method for connecting a multi-conducting elastic electrode tube, characterized in that, The connection method includes: 1) A packing tube is placed between the first tube body and the second tube body. The first tube body and the second tube body are connected by a wire. The wire passes through the outer peripheral cavity of the first tube body and the second tube body respectively and surrounds the central cavity of the first tube body and the second tube body. 2) Insert the mandrel through the central cavity of the first tube, the packing tube, and the central cavity of the second tube; 3) Wrap the end of the first tube near the packing tube, the wire and packing tube between the first tube and the second tube with a single-lumen tube; 4) Connect the first tube body, the packing tube, the second tube body and the single-lumen tube to each other. Step 4) includes: 4a) putting heat shrink tubing on the outside of the first tube body, the single-lumen tube and the second tube body and heating it; 4b) peeling off the heat shrink tubing and pulling out the mandrel.

2. The connection method of the multi-conducting elastic electrode tube according to claim 1, characterized in that, In step 1), the first tube and the second tube are connected by 2n wires. The 2n wires pass through the 2n outer cavities of the first tube and the second tube respectively and surround the central cavity of the first tube and the second tube, so that the 2n wires surround the packing tube and the axis of the packing tube is aligned with the axis of the first tube and the axis of the second tube.

3. The connection method of the multi-conducting elastic electrode tube according to claim 1, characterized in that, In step 2), a mandrel is inserted through the central cavity of the first tube, the packing tube, and the central cavity of the second tube so that the first tube, the packing tube, and the second tube come into contact in sequence.

4. The connection method of the multi-conducting elastic electrode tube according to claim 1, characterized in that, In step 3), a single-lumen tube is used to wrap the end of the first tube near the packing tube, the 2n wires and packing tube between the first tube and the second tube, and the end of the second tube near the packing tube.

5. The connection method of the multi-conducting elastic electrode tube according to claim 1, characterized in that, Step 1) further includes: a) Provide a first tube and a second tube, wherein the first tube and the second tube each contain 2n+1 lumens extending along the axial direction of the tube, where n is an integer greater than or equal to 1 and less than or equal to 8; b) Make incisions on the outer walls of the first tube and the second tube respectively to expose at least one peripheral lumen; c) Insert the wires into the outer circumferential cavities of the first tube and the second tube, respectively; d) Pick one end of the wire out of the tube body through the cut on the outer wall of the first tube body in the predetermined wire picking sequence and connect it to the head electrode ring respectively. Pick the other end of the wire out of the tube body through the cut on the outer wall of the second tube body in the predetermined wire picking sequence and connect it to the tail electrode ring respectively.

6. The connection method of the multi-conducting elastic electrode tube according to claim 5, characterized in that, In step a), a central lumen is located at the axial center of the tube body, and the remaining 2n peripheral lumens are distributed around the central lumen.

7. The connection method of the multi-conducting elastic electrode tube according to claim 5, characterized in that, In step b), 2n cuts are made on the outer walls of the first tube and the second tube along the axial and circumferential directions of the tube in a predetermined cutting sequence and at a predetermined cutting interval, with each cut exposing at least one peripheral lumen.

8. The connection method of the multi-conducting elastic electrode tube according to claim 5, characterized in that, In step c), 2n wires are inserted into the 2n peripheral cavities of the first tube and the second tube, respectively.

9. The connection method of the multi-conducting elastic electrode tube according to claim 5, characterized in that, In step d), one end of 2n wires is picked out of the tube body from 2n cuts on the outer wall of the first tube body in a predetermined order and electrically connected to 2n head electrode rings respectively. The other end of 2n wires is picked out of the tube body from 2n cuts on the outer wall of the second tube body in a predetermined order and electrically connected to 2n tail electrode rings respectively.

10. The connection method of the multi-conducting elastic electrode tube according to claim 9, characterized in that, Step d) further includes: d1) Starting from the first incision furthest from the distal end of the first tube body, pick out one end of the first wire in the first peripheral lumen; d2) Slide the first end electrode ring onto the distal end of the first tube body, so that the first end electrode ring wraps around the first tube body and covers the first cut, and is electrically connected to the protruding end of the first wire. d3) Repeat steps d1) and d2) until the 2n-end electrode ring covers the 2n-end cut of the first tube and is electrically connected to the protruding end of the 2n-end wire; d4) Starting from the first incision closest to the distal end of the second tube, pick out the other end of the first wire in the first peripheral lumen; d5) Slide the first tail electrode ring onto the proximal end of the second tube body, so that the first tail electrode ring wraps around the second tube body and covers the first cut, and is electrically connected to the other end of the first wire. d6) Repeat steps d4) and d5) until the 2n tail electrode ring covers the 2n cut of the second tube and is electrically connected to the other end of the 2n wire.

11. The connection method of the multi-conducting elastic electrode tube according to claim 10, characterized in that, The electrical connection between the electrode ring and the wire further includes: - A metal ring is riveted to the protruding end of the wire, wherein the riveted metal ring is arc-shaped and its curved surface is consistent with the inner surface of the electrode ring. - Weld the metal ring to the inner surface of the electrode ring.

12. The connection method of the multi-conducting elastic electrode tube according to claim 1, characterized in that, The cross-section of the packing tube is polygonal.

13. The connection method of the multi-conducting elastic electrode tube according to claim 1, characterized in that, The first tube, the filler tube, the second tube, and the single-lumen tube are made of materials selected from thermoplastic elastomers, the heat shrink tubing is made of perfluoroethylene propylene copolymer, and the mandrel is made of stainless steel or nickel-titanium alloy wire with the mandrel surface coated with polytetrafluoroethylene.

14. The connection method of the multi-conducting elastic electrode tube according to claim 13, characterized in that, The thermoplastic elastomer is thermoplastic polyurethane.

15. A multi-conductivity elastic electrode, characterized in that, The multi-conducting elastic electrode includes: - A first tube and a second tube, the first tube and the second tube are connected by a wire, the wire passing through the outer peripheral cavity of the first tube and the second tube respectively and surrounding the central cavity of the first tube and the second tube; - A packing tube, wherein the packing tube is located between a first tube body and a second tube body; - A conductor, which surrounds the packing tube; - A single-lumen tube, which encloses the end of the first tube body near the filler tube, the wire and filler tube between the first tube body and the second tube body, and the end of the second tube body near the filler tube; The first tube body, the packing tube, the second tube body, and the single-lumen tube are heat-fused together.

16. The multi-conducting elastic electrode according to claim 15, characterized in that, The first tube and the second tube are connected by 2n wires, which pass through 2n peripheral cavities of the first tube and the second tube respectively and surround the central cavity of the first tube and the second tube.

17. The multi-conducting elastic electrode according to claim 15, characterized in that, The axial position of the packing tube is aligned with the axial positions of the first tube and the second tube.

18. The multi-conducting elastic electrode according to claim 15, characterized in that, The conductor consists of 2n conductors, which are arranged around the filler tube.

19. The multi-conducting elastic electrode according to claim 15, characterized in that, The single-lumen tube encloses the end of the first tube near the filler tube, the 2n wires and filler tube between the first and second tubes, and the end of the second tube near the filler tube.

20. The multi-conducting elastic electrode according to claim 18, characterized in that, The first tube and the second tube each contain 2n+1 cavities extending along the axial direction of the tube, where n is an integer greater than or equal to 1 and less than or equal to 8. The 2n wires are respectively inserted into the 2n outer cavities of the first tube and the second tube.

21. The multi-conducting elastic electrode according to claim 20, characterized in that, A central lumen is located at the axis of the tube body, and the remaining 2n peripheral lumens are distributed around the central lumen.

22. The multi-conducting elastic electrode according to claim 15, characterized in that, The first tube and the second tube each include: - An incision that exposes at least one peripheral lumen; - A wire, which is inserted into the peripheral lumen of the first tube and the second tube respectively and has an exposed end that passes through a cut in the peripheral lumen; - An electrode ring, which is fitted onto the outer wall of the tube and covers the cut, thereby electrically connecting to the exposed end of the wire.

23. The multi-conducting elastic electrode according to claim 22, characterized in that, The incision consists of 2n incisions, which are formed on the outer wall of the tube in a predetermined order and at predetermined intervals along the axial and circumferential directions of the tube. Each incision exposes an outer peripheral lumen.

24. The multi-conducting elastic electrode according to claim 22, characterized in that, The conductor consists of 2n conductors, which are respectively inserted into 2n peripheral lumens of the first tube and the second tube, and each has an exposed end that passes through a cut in the peripheral lumen.

25. The multi-conducting elastic electrode according to claim 22, characterized in that, The electrode ring consists of 2n electrode rings, which are sequentially and alternately fitted onto the outer wall of the tube and cover 2n slits respectively, thereby electrically connecting to the exposed ends of 2n wires respectively.

26. The multi-conducting elastic electrode according to claim 22, characterized in that, The wires are electrically connected to the corresponding electrode rings via terminals.

27. The multi-conducting elastic electrode according to claim 26, characterized in that, The terminal is a metal ring riveted into an arc shape, the curved surface of which is consistent with the inner surface of the electrode ring and welded to the inner surface of the electrode ring.

28. The multi-conducting elastic electrode according to claim 15, characterized in that, The multi-conducting elastic electrode is provided with a marker ring, which is located near the proximal end of the multi-conducting elastic electrode.

29. The multi-conducting elastic electrode according to claim 15, characterized in that, The distal end of the multi-conducting elastic electrode is formed into a hemispherical shape.

30. The multi-conducting elastic electrode according to claim 15, characterized in that, A positioning anchor is provided on the outside of the multi-conducting elastic electrode.

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