CN115554596B

CN115554596B - Nerve stimulation electrode and nerve stimulator

Info

Publication number: CN115554596B
Application number: CN202211555368.5A
Authority: CN
Inventors: 陈风顺; 王栋潇; 王守东
Original assignee: Hangzhou Shenluo Medical Technology Co ltd
Current assignee: Hangzhou Shenluo Medical Technology Co ltd
Priority date: 2022-12-06
Filing date: 2022-12-06
Publication date: 2023-02-28
Anticipated expiration: 2042-12-06
Also published as: CN115554596A

Abstract

The invention relates to a nerve stimulation electrode and a nerve stimulator, wherein the nerve stimulation electrode comprises a tube assembly, an electrode and a conductor, the tube assembly comprises an outer tube, an inner tube and a hollow unit arranged between the outer tube and the inner tube; the electrode comprises a first electrode arranged on the outer tube and a second electrode arranged on the inner tube; the electric conductor is arranged in the hollow unit in a penetrating way, and two ends of the electric conductor respectively extend into the outer pipe and the inner pipe to connect the first electrode and the second electrode; the side wall of the hollow unit is sealed along the circumferential direction, and the two ends of the hollow unit are respectively connected with the outer pipe and the inner pipe in a sealing manner. The invention has the advantages that: the lateral wall of cavity unit is sealed along circumference, and the both ends of cavity unit sealing connection outer tube and inner tube respectively, and near implanting nerve stimulation electrode near target stimulation position back, the tube subassembly can separate the tissue liquid of organism outside nerve stimulation electrode, prevents that the tissue liquid of organism from getting into inside the nerve stimulation electrode and leading to the nerve stimulation electrode to take place the short circuit, avoids taking place medical negligence.

Description

Nerve stimulation electrode and nerve stimulator

Technical Field

The invention relates to the technical field of medical instruments, in particular to a nerve stimulation electrode and a nerve stimulator.

Background

A neurostimulation electrode is a medical instrument for treating neurological diseases, and when the neurostimulation electrode is used for treating neurological diseases or performing experiments, the neurostimulation electrode needs to be implanted near a target stimulation position on the nervous tissue of a living body so as to apply electrical stimulation to the target stimulation position.

In order to adapt to the expansion and contraction of the muscles of the organism, a part of the nerve stimulation electrode implanted in the organism is designed into a flexible structure, so that the flexible structure generates adaptive stretching, bending and deformation along with the expansion and contraction of the muscles of the organism. However, the flexible structure may have cracks after being deformed by multiple times of stretching and bending, and tissue fluid of a living body enters the nerve stimulation electrode from the cracks, which may cause short circuit of the nerve stimulation electrode and cause medical accidents.

Disclosure of Invention

In view of the above, the present invention provides a nerve stimulation electrode, which is configured to block tissue fluid of a living body outside the nerve stimulation electrode after the nerve stimulation electrode is implanted near a target stimulation site, so as to prevent the tissue fluid from entering the nerve stimulation electrode to cause a short circuit of the nerve stimulation electrode, thereby avoiding a medical accident.

In order to solve the above problems, the present invention provides the following technical solutions:

a nerve stimulation electrode comprises a tube assembly, an electrode and a conductor, wherein the tube assembly comprises an outer tube, an inner tube and a hollow unit arranged between the outer tube and the inner tube; the electrode comprises a first electrode arranged on the outer tube and a second electrode arranged on the inner tube; the conductor is arranged in the hollow unit in a penetrating way, and two ends of the conductor respectively extend into the outer tube and the inner tube so as to connect the first electrode and the second electrode; the side wall of the hollow unit is sealed along the circumferential direction, and the two ends of the hollow unit are respectively connected with the outer pipe and the inner pipe in a sealing manner.

In one embodiment, the hollow unit comprises a protective pipe and a hollow elastic piece, the side wall of the protective pipe is sealed along the circumferential direction, and the hollow elastic piece is sleeved on the protective pipe.

So set up, the protective tube can play the barrier effect, can prevent that the tissue fluid separation of organism from getting into nerve stimulation electrode inside and leading to nerve stimulation electrode to take place the short circuit in nerve stimulation electrode outside with the tissue fluid separation of organism. The hollow elastic member has elasticity and can adapt to the expansion and contraction of the muscles of the organism.

In one embodiment, the inner side of the hollow elastic member abuts against the outer peripheral wall of the shield tube.

So set up, the protective tube can play the limiting action to the flexible bending of elasticity of cavity elastic component, prevents that the cavity elastic component from appearing stretching by a wide margin or big curvature is crooked.

In one embodiment, the hollow elastic member is a close-coil spring.

With the arrangement, the hollow elastic piece can generate large-amplitude stretching deformation when receiving stretching force, thereby adapting to the expansion and contraction of organism muscles. The hollow elastic part does not generate compression deformation or has limited amplitude of compression deformation when receiving the compression force, and the whole body can maintain better rigidity, thereby being convenient for the nerve stimulation electrode to penetrate into the puncture needle.

In one embodiment, the hollow elastic member is a net-shaped elastic expansion structure, the net-shaped elastic expansion structure includes a first spiral and a second spiral, the second spiral is connected to the first spiral, the rotation directions of the first spiral and the second spiral are opposite, the first spiral and the second spiral are elastic, the first spiral includes a plurality of first spiral turns, a first gap is formed between two adjacent first spiral turns, the second spiral includes a plurality of second spiral turns, a second gap is formed between two adjacent second spiral turns, and the plurality of first spiral turns extend into the plurality of second gaps.

With the arrangement, the hollow elastic part can generate stretching deformation with limited amplitude when receiving tensile force, on one hand, the hollow elastic part can generate stretching deformation so as to adapt to expansion and contraction of organism muscles, and on the other hand, the hollow elastic part has limited amplitude of stretching deformation so as to prevent the electric conductor from being pulled apart.

In one embodiment, the protective tube is a TPU tube or a silicone tube; and/or the diameter of the outer peripheral wall of the protective tube is smaller than that of the outer peripheral wall of the outer tube, and the diameter of the outer peripheral wall of the protective tube is smaller than that of the outer peripheral wall of the inner tube; and/or one of the outer tube or the inner tube is integrally formed with the guard tube.

So set up, the protective tube is TPU pipe or silicone tube for the protective tube has fine biocompatibility, can reduce the rejection reaction that produces after the hollow unit gets into the organism. When the periphery wall diameter of protective tube was less than the periphery wall diameter of outer tube, and when the periphery wall diameter of protective tube was less than the periphery wall diameter of inner tube, outer tube, protective tube and inner tube connected gradually after, can form the convex structure in middle part sunken both sides. Can cup joint the periphery wall in the protective tube with the cavity elastic component, connect the both ends of cavity elastic component respectively in the terminal surface that is close to the protective tube of outer tube and the terminal surface that is close to the protective tube of inner tube to realize the location of cavity elastic component. The outer tube or the inner tube is integrally formed with the protective tube, so that on one hand, when the nerve stimulation electrode is assembled, the step of connecting the protective tube to the outer tube or the inner tube integrally formed with the protective tube can be omitted, and on the other hand, the hollow elastic piece is conveniently sleeved on the outer peripheral wall of the protective tube.

In one embodiment, the electrical conductor is of a resiliently flexible configuration and at least the hollow element of the tube assembly is of a resiliently flexible configuration.

By the arrangement, the electric conductor can also elastically stretch, bend and deform, so that the nerve stimulation electrode can adapt to the expansion and contraction of the muscles of the organism.

In one embodiment, the conductor has a stretch margin when the tube assembly is stretched to its longest state.

So set up, at the flexible crooked in-process of nerve stimulation electrode, the electric conductor can not torn, prevents to take place medical accident.

In one embodiment, the electrical conductor comprises a helical structure.

By the arrangement, the spiral structure can allow the conductor to have large-amplitude telescopic bending deformation, and the conductor can be prevented from being torn off.

The invention also provides a nerve stimulator which comprises a signal generator and the nerve stimulation electrode, wherein the nerve stimulation electrode is electrically connected with the signal generator.

Compared with the prior art, the nerve stimulation electrode provided by the invention comprises the outer tube, the inner tube and the tube assembly of the hollow unit, the side wall of the hollow unit is sealed along the circumferential direction, and the two ends of the hollow unit are respectively connected with the outer tube and the inner tube in a sealing manner, so that after the nerve stimulation electrode is implanted near a target stimulation part, the tube assembly can block tissue fluid of an organism outside the nerve stimulation electrode, prevent the tissue fluid of the organism from entering the nerve stimulation electrode to cause short circuit of the nerve stimulation electrode, and avoid medical accidents.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the description below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a neurostimulation electrode according to one embodiment of the invention;

FIG. 2 is a schematic view of the neurostimulation electrode shown in FIG. 1 without the hollow unit;

FIG. 3 is an enlarged schematic view of a cross-sectional view taken at A of FIG. 1;

FIG. 4 is an enlarged schematic view at B of FIG. 2;

FIG. 5 is a schematic structural view of the nerve stimulating electrode of one embodiment of the present invention without the hollow elastic member;

FIG. 6 is a schematic structural diagram of a portion of the structure of a neurostimulation electrode according to one embodiment of the invention;

FIG. 7 is a schematic structural view of a hollow elastic member in the nerve stimulation electrode shown in FIG. 6;

fig. 8 is a schematic structural view of a hollow elastic member in one embodiment.

Reference numerals:

10. a tube assembly; 11. an outer tube; 12. an inner tube; 13. a hollow unit; 131. a protective tube; 132. a hollow elastic member; 1321. a first helix; 1322. a second helix; 21. a first electrode; 22. a second electrode; 30. an electrical conductor; 31. a helical structure.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiment in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and therefore the application is not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used in the description of the present application are for illustrative purposes only and do not represent the only embodiments.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of this application, the term "and/or" includes any and all combinations of one or more of the associated listed items.

A neurostimulation electrode is an implantable medical device in vivo for treating a neurological condition by applying electrical stimulation to a target stimulation site located within a living organism, the target stimulation site being a site in the organism where electrical stimulation is to be applied to neural tissue to be treated or tested. When in use, the nerve stimulation electrode is usually implanted into a living body by a puncture needle, and the specific method is as follows: the puncture needle with hollow channel is used to puncture organism, the puncture needle is punctured to the position near the target stimulation position, then the nerve stimulation electrode is sent to the position near the target stimulation position along the hollow part of the puncture needle, and then the puncture needle is withdrawn, the nerve stimulation electrode is remained in the organism.

When the nerve stimulation electrode is used, one part of the nerve stimulation electrode is implanted in a living body, and the other part of the nerve stimulation electrode is left outside the living body. The part left outside the organism can be connected with the signal generator, and can receive the electrical stimulation signal sent by the signal generator and transmit the electrical stimulation signal to the in-vivo part of the nerve stimulation electrode, and the in-vivo part of the nerve stimulation electrode applies electrical stimulation to the target stimulation part, thereby playing the role of treating the nerve diseases.

Referring to fig. 1 and 2, the present application provides a neurostimulation electrode, which comprises a tube assembly 10, an electrode and an electrical conductor 30. The pipe assembly 10 includes an outer pipe 11, an inner pipe 12, and a hollow unit 13, the hollow unit 13 being disposed between the outer pipe 11 and the inner pipe 12. The electrodes include a first electrode 21 and a second electrode 22, the first electrode 21 is disposed on the outer tube 11, the second electrode 22 is disposed on the inner tube 12, and the first electrode 21 and the second electrode 22 are respectively connected to two ends of the conductive body 30. In operation or experiment, the second electrode 22 is implanted near a target stimulation site in a living body, the first electrode 21 is used for receiving an electric signal and transmitting the electric signal to the second electrode 22 through the electric conductor 30, and the second electrode 22 applies electric stimulation to the target stimulation site so as to exert a therapeutic effect or a test effect.

In some embodiments, to ensure a secure connection between the electrode and the tube assembly 10, the first electrode 21 is an interference fit with the outer tube 11 and the second electrode 22 is an interference fit with the inner tube 12.

Preferably, referring to fig. 1, in some embodiments, the first electrode 21 and the second electrode 22 are both ring-shaped structures.

Preferably, referring to fig. 1, in some embodiments, the outer tube 11 and the inner tube 12 are both hollow circular straight tubes.

Further, referring to fig. 1, in some embodiments, the first electrode 21 is disposed on the outer circumferential wall of the outer tube 11, and the second electrode 22 is disposed on the outer circumferential wall of the inner tube 12.

Some nerve stimulation electrodes are implanted into a part of a living body and are designed into flexible structures, so that the flexible structures can generate adaptive stretching bending deformation along with the expansion and contraction of the muscles of the living body, and the expansion and contraction of the muscles of the living body can be adapted. However, the flexible structure may have cracks after being deformed by multiple times of stretching and bending, and tissue fluid of a living body enters the nerve stimulation electrode from the cracks, which may cause short circuit of the nerve stimulation electrode and cause medical accidents.

In view of this, in the neurostimulation electrode provided by the invention, the side wall of the hollow unit 13 is closed along the circumferential direction, and the two ends of the hollow unit 13 are respectively connected with the outer tube 11 and the inner tube 12 in a sealing manner. Therefore, the tissue fluid of the organism can be blocked outside the nerve stimulation electrode through the tube assembly 10, the tissue fluid of the organism is prevented from entering the nerve stimulation electrode, the short circuit of the nerve stimulation electrode is avoided, and the medical accident is avoided. The conductor 30 is inserted into the hollow unit 13, one end of the conductor 30 extends into the outer tube 11 and is connected to the first electrode 21, and the other end of the conductor 30 extends into the inner tube 12 and is connected to the second electrode 22. Thus, electrical conductor 30 may be completely protected within tube assembly 10, which may prevent the conductive portion of electrical conductor 30 from contacting biological tissue fluids, preventing a short circuit; on the other hand, the conductive body 30 can be prevented from being damaged by external factors due to exposure to the external environment, such as: corroded and accidentally torn apart.

Referring to fig. 3, in some embodiments, to facilitate the passage of the conductive body 30 through the hollow unit 13, the conductive body 30 may be a wire. The use of a guide wire as the electrical conductor 30 also facilitates reducing the overall size of the nerve stimulating electrode, thereby facilitating implantation into a living body.

Referring to fig. 6, in some embodiments, the hollow unit 13 includes a hollow elastic member 132, and two ends of the hollow elastic member 132 are respectively connected to the outer tube 11 and the inner tube 12. The hollow elastic member 132 has elasticity and can accommodate expansion and contraction of a living muscle.

Referring to fig. 5 and 6, in some embodiments, the hollow unit 13 further includes a protection tube 131, and a side wall of the protection tube 131 is circumferentially closed. The protective tube 131 can block the tissue fluid of the living body outside the nerve stimulation electrode, and prevent the tissue fluid of the living body from entering the nerve stimulation electrode to cause short circuit of the nerve stimulation electrode.

Referring to fig. 6, in some embodiments, the hollow elastic member 132 is sleeved on the protection tube 131, and the protection tube 131 can be deformed by stretching and bending. This allows the entire hollow unit 13 to be expanded, contracted, and bent, and allows the portion of the hollow unit 13 implanted in the living body to be deformed in conformity with the expansion and contraction of the muscles of the living body. In these embodiments, when the neurostimulation electrode implanted in the living body is pulled due to the movement of the living body, even if the muscle of the living body undergoes a large expansion and contraction, since the hollow unit 13 can be flexed and extended as a whole, the second electrode 22 can move along with the muscle in the vicinity thereof, and the relative position between the second electrode 22 and the corresponding target stimulation site remains unchanged or changes only negligibly and slightly, so as to ensure the stability of the relative position between the second electrode 22 and the corresponding target stimulation site, and ensure that the electrical stimulation applied by the second electrode 22 can be transmitted to the target stimulation site, that is: ensure that the nerve stimulation electrode can still stably play the role of treating nerve diseases or testing role when the organism moves or the organism muscles expand and contract to a larger extent.

Of course, in some embodiments, the protection tube 131 may be sleeved on the hollow elastic member 132.

Preferably, referring to fig. 6, in some embodiments, the inner side of the hollow elastic member 132 abuts against the outer circumferential wall of the protection tube 131. So set up, not only make the overall structure of hollow unit 13 compacter, moreover in the flexible crooked in-process takes place for hollow elastic component 132, the periphery wall of protective tube 131 supports the inner wall at hollow elastic component 132, provides rigidity compensation for hollow elastic component 132 to the flexible crooked restriction effect to hollow elastic component 132, in order to avoid hollow elastic component 132 to appear stretching by a wide margin or big curvature bending and tear electric conductor 30 apart, thereby prevent that nerve stimulation electrode from damaging and causing medical accident or experiment interrupt.

Preferably, referring to fig. 3, in some embodiments, the hollow elastic member 132 may be a tight coil spring.

The gaps between the spring rings of the close-coil spiral spring are small, even no gaps exist. On one hand, the compression of the tight-coil spiral spring cannot occur or the compression amplitude is very small when the tight-coil spiral spring is in the original length state; on the other hand, this leaves a large tension space for the close-coil spring. Therefore, the use of the tight coil spring as the hollow elastic member 132 has the following advantages:

first, the hollow elastic member 132 can generate a significant tensile deformation when receiving an axial tensile force, and can be adapted to the expansion and contraction of the muscles of the living body.

In addition, even if a large axial pressure is applied, the hollow elastic member 132 does not undergo significant compression deformation. In the course of delivering the nerve stimulating electrode to the target stimulation site along the hollow portion of the puncture needle, the hollow elastic member 132 can be rapidly, stably, and accurately pushed into a designated position in the puncture needle.

In particular, when a tight-wound coil spring having no gap between two windings is used as the hollow elastic member 132, the hollow elastic member 132 is not subjected to compressive deformation even when subjected to a large axial pressure. In the process of delivering the nerve stimulating electrode to the target stimulation site along the hollow portion of the puncture needle, it is more advantageous to push the hollow elastic member 132 into the designated position in the puncture needle rapidly, stably, and accurately.

Further, the amount of deformation by which the tight coil spring itself is bent is limited, so that the hollow elastic member 132 can be prevented from having a bent portion whose curvature is greatly exaggerated.

Preferably, referring to fig. 6 to 8, in some embodiments, the hollow elastic member 132 may be a net-shaped elastic telescopic structure, the net-shaped elastic telescopic structure includes a first spiral 1321 and a second spiral 1322, the second spiral 1322 is connected to the first spiral 1321, the directions of the first spiral 1321 and the second spiral 1322 are opposite, and the first spiral 1321 and the second spiral 1322 have elasticity, the first spiral 1321 includes a plurality of first spiral turns, a first gap is formed between two adjacent first spiral turns, the second spiral 1322 includes a plurality of second spiral turns, a second gap is formed between two adjacent second spiral turns, and the plurality of first spiral turns extend into the plurality of second gaps. Accordingly, the hollow elastic member 132 is subjected to a limited stretching deformation when being subjected to a pulling force, and on one hand, the hollow elastic member 132 can be subjected to a stretching deformation to accommodate the expansion and contraction of the body muscle because both the first spiral 1321 and the second spiral 1322 have elasticity, and on the other hand, the hollow elastic member 132 is subjected to a limited stretching deformation and cannot be bent or is bent only to a small extent because the second spiral 1322 is connected to the first spiral 1321 and the plurality of first spiral turns extend into the plurality of second gaps when the hollow elastic member 132 is stretched, and the first spiral 1321 and the second spiral 1322 interfere with each other, so that the electric conductor 30 can be prevented from being torn off.

In other words, the mesh-like elastic and stretchable structure is adopted as the hollow elastic member 132, which has the following advantages: in these embodiments, it is not necessary for the outer peripheral wall of the protection tube 131 to abut against the inner wall of the hollow elastic member 132, it is not necessary for the protection tube 131 to limit the stretching and bending of the hollow elastic member 132, it is not necessary for the protection tube 131 to prevent the hollow elastic member 132 from stretching greatly or bending with large curvature, as long as the protection tube 131 can stretch and contract along with the net-shaped stretching structure. The range of the stretching and bending of the hollow elastic member 132 can be limited by the structure of the net-shaped telescopic structure, so that the hollow elastic member 132 is prevented from being stretched or bent with a large curvature to a large extent, and the electric conductor 30 is prevented from being broken.

Preferably, referring to fig. 8, in some embodiments, the pitch between two adjacent first coils is equal to the pitch between two adjacent second coils. Therefore, when the hollow elastic member 132 is stretched, the stretching distances of the first spirals 1321 and the second spirals 1322 in the longitudinal direction thereof are substantially the same, and the processes of stretching the first spirals 1321 and the second spirals 1322 together are relatively coordinated.

Preferably, in some embodiments, the protection tube 131 may be a TPU tube or a silicone tube, the TPU material and the silicone tube have good biocompatibility, and the TPU tube or the silicone tube is used as the protection tube 131 to reduce rejection reaction generated after the hollow unit 13 is implanted into an organism.

In some embodiments, in order to prevent the electric conductor 30 penetrating the hollow unit 13 from interfering with the telescopic bending of the hollow unit 13, the electric conductor 30 has an elastic and telescopic bending structure.

Further, in some embodiments, to ensure that electrical conductor 30 does not tear when hollow unit 13 is telescopically bent, electrical conductor 30 is provided with a stretch margin even when tube assembly 10 is stretched to its longest state. Alternatively, the stretch margin may be 10% of the original length of the conductor 30. Namely: conductor 30 can also continue to be elongated by a length that is 10% of its original length when tube assembly 10 is stretched to its longest condition.

Preferably, referring to fig. 4, in some embodiments, the conductive body 30 includes a helical structure 31, and the helical structure 31 extends helically along the length of the shielding tube 131. Thus, helical structure 31 can allow conductor 30 to undergo a large amount of expansion, contraction, bending, and deformation, thereby ensuring that conductor 30 does not tear. The helical structure 31 may be a cylindrical coil spring or a conical coil spring.

It will be appreciated that the electrical conductor 30 may also be a plastic part in a non-tensioned state, which also prevents the electrical conductor 30 from interfering with the telescopic bending of the hollow unit 13. Such as a thin metal wire in a non-tensioned state.

It should be noted that the hollow elastic member 132 is not limited to a tight coil spring and a net-shaped elastic telescopic structure, and in other embodiments, the hollow elastic member 132 may also be a corrugated tube.

The application also provides a nerve stimulator, which comprises a signal generator and the nerve stimulation electrode, wherein the first electrode 21 of the nerve stimulation electrode is electrically connected with the signal generator. The signal generator is used for sending out an electrical stimulation signal, the first electrode 21 receives the electrical stimulation signal and transmits the electrical stimulation signal to the second electrode 22, and the second electrode 22 applies electrical stimulation to a target stimulation part, so that a therapeutic effect or a test effect is achieved. By arranging the nerve stimulation electrode, the tissue fluid of an organism can be prevented from entering the interior of the nerve stimulation electrode to cause the short circuit of the nerve stimulation electrode, and medical accidents are avoided. Preferably, the signal generator may be a pulse generator.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A neurostimulation electrode, comprising:

a tube assembly (10) comprising an outer tube (11), an inner tube (12) and a hollow unit (13) disposed between the outer tube (11) and the inner tube (12);

electrodes including a first electrode (21) disposed on the outer tube (11), and a second electrode (22) disposed on the inner tube (12);

a conductor (30) inserted into the hollow unit (13) and having two ends extending into the outer tube (11) and the inner tube (12) respectively to connect the first electrode (21) and the second electrode (22);

the side wall of the hollow unit (13) is closed along the circumferential direction, and two ends of the hollow unit (13) are respectively connected with the outer pipe (11) and the inner pipe (12) in a sealing mode.

2. The neurostimulation electrode according to claim 1, characterized in that the hollow unit (13) comprises a protection tube (131) and a hollow elastic member (132), wherein the side wall of the protection tube (131) is circumferentially closed, and the hollow elastic member (132) is sleeved on the protection tube (131).

3. The neurostimulation electrode according to claim 2, characterized in that the inner side of the hollow elastic member (132) abuts against the peripheral wall of the protective tube (131).

4. The neurostimulation electrode according to claim 2 or claim 3, wherein the hollow elastic member (132) is a tight coil spring.

5. The neurostimulation electrode according to claim 4, characterized in that the hollow elastic member (132) is a reticular elastic telescopic structure comprising a first spiral (1321) and a second spiral (1322), the second spiral (1322) being connected to the first spiral (1321), the directions of rotation of the first spiral (1321) and the second spiral (1322) being opposite and the first spiral (1321) and the second spiral (1322) each having elasticity, the first spiral (1321) comprising a plurality of first turns, a first gap being formed between two adjacent first turns, the second spiral (1322) comprising a plurality of second turns, a second gap being formed between two adjacent second turns, a plurality of first turns extending into a plurality of the second gaps.

6. The neurostimulation electrode according to claim 2 or claim 3, wherein the protective tube (131) is a TPU tube or a silicone tube; and/or the diameter of the peripheral wall of the protective pipe (131) is smaller than that of the peripheral wall of the outer pipe (11), and the diameter of the peripheral wall of the protective pipe (131) is smaller than that of the peripheral wall of the inner pipe (12); and/or one of the outer tube (11) or the inner tube (12) is integrally formed with the guard tube (131).

7. The neurostimulation electrode according to claim 1, characterized in that said electrical conductor (30) is of an elastically stretchable and contractible curved structure, and at least said hollow element (13) of said tube assembly (10) is of an elastically stretchable and contractible curved structure.

8. The neurostimulation electrode according to claim 7, characterized in that said electrical conductor (30) has a stretching margin when said tube assembly (10) is stretched to its longest state.

9. The neurostimulation electrode according to claim 7, characterized in that the electrical conductor (30) comprises a helical structure.

10. A neurostimulator comprising a signal generator and a neurostimulation electrode as claimed in any of claims 1-9, the neurostimulation electrode being electrically connected to the signal generator.