CN217339788U

CN217339788U - Nerve stimulator

Info

Publication number: CN217339788U
Application number: CN202220516939.3U
Authority: CN
Inventors: 潘红明; 刘怀峰; 成诗伟
Original assignee: Microport Urocare Shanghai Co Ltd
Current assignee: Microport Urocare Shanghai Co Ltd
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2022-09-02
Anticipated expiration: 2032-03-10
Also published as: WO2023169083A1

Abstract

The utility model relates to a nerve stimulator. The neurostimulator comprises a shell and a discharge electrode, wherein the shell comprises a chassis and a side wall arranged at the edge of the chassis, an insulating ring is sleeved on the outer side face of the side wall, the insulating ring is far away from the outer side face of the side wall, a first annular clamping groove is formed in the outer side face of the side wall, an annular discharge electrode is arranged in the first annular clamping groove, and the other discharge electrode is jointed on the surface of the chassis. First ring groove has played limiting displacement to cyclic annular discharge electrode, and, first ring groove's cell wall is right cyclic annular discharge electrode forms the parcel, has guaranteed insulating effect, can effectively avoid cyclic annular discharge electrode assembly back position to change and cyclic annular discharge electrode and shell short circuit's problem.

Description

Nerve stimulator

Technical Field

The utility model relates to the field of medical equipment, especially, relate to a nerve stimulator.

Background

With the recent increase of diabetes and nervous system injury diseases, the incidence of secondary related diseases such as Overactive bladder (OAB) has also increased year by year. Overactive bladder is a syndrome characterized by symptoms of urgency, often accompanied by frequency and nocturia, with or without urge incontinence; urodynamics can be manifested as detrusor overactivity, but also other forms of urethro-bladder dysfunction, with overactive bladder having no clear etiology, excluding symptoms caused by acute urinary tract infections or other forms of bladder-urethral local lesions. Overactive bladder significantly affects the daily life and social activities of patients, and has become a disease that afflicts people. The currently preferred treatment methods are behavior treatment and drug treatment, and the second-line nerve stimulation treatment is mainly adopted for the drug-refractory and drug-resistant non-obstructive urinary retention and overactive bladder.

The neurostimulator is used for applying electrical stimulation to target nerve tissue (such as a tibial nerve) by generating an electric field after being implanted into a human body. Research finds that in some existing nerve stimulators, the position of the discharge electrode is not fixed, the discharge electrode is easy to contact with the shell and is short-circuited with the shell, and in addition, the assembly difficulty of the discharge electrode is high.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the position of the discharge electrode is not fixed and is easy to be short-circuited with the shell, the utility model provides a neural stimulator, which improves the reliability of the neural stimulator.

The utility model provides a nerve stimulator includes:

the shell comprises a chassis and a side wall arranged along the edge of the chassis, an insulating ring is sleeved on the outer side surface of the side wall, and a first annular clamping groove is formed in the outer side surface, far away from the side wall, of the insulating ring;

the annular discharge electrode is arranged in the first annular clamping groove; and the number of the first and second groups,

and another discharge electrode having a polarity opposite to that of the annular discharge electrode, the another discharge electrode being joined to the chassis surface.

Optionally, first ring groove includes annular first tank bottom surface, is in respectively lateral wall and first draw-in groove lower wall on the first draw-in groove that first tank bottom surface width direction's both edges set up, first tank bottom surface for the ring central axis of insulating ring has an inclination, the peripheral dimension of lateral wall is greater than on the first draw-in groove the peripheral dimension of lateral wall under the first draw-in groove. Optionally, the inclination angle ranges from 3 ° to 8 °.

Optionally, the inner side surface of the annular discharge electrode is attached to the bottom surface of the first slot of the first annular slot, and the annular discharge electrode has a first end adjacent to the upper side wall of the first slot and a second end adjacent to the lower side wall of the first slot.

Optionally, the annular discharge electrode and the insulating ring are in interference fit.

Optionally, the annular discharge electrode is provided with at least two slots at the second end.

Optionally, a second annular clamping groove is formed in the outer side face of the side wall, and the insulating ring is sleeved in the second annular clamping groove.

Optionally, second annular draw-in groove includes annular second tank bottom surface, is in respectively lateral wall and second draw-in groove lower lateral wall on the second draw-in groove that the both edges of width direction of second tank bottom surface set up, the second tank bottom surface for the ring central axis of lateral wall has an inclination, the peripheral dimension of lateral wall is greater than on the second draw-in groove the peripheral dimension of lateral wall under the first draw-in groove. Optionally, the inclination angle ranges from 3 ° to 8 °.

Optionally, the nerve stimulator is a tibial nerve stimulator.

The utility model provides an among the neurostimulator, the shell includes the chassis and follows the lateral wall of the edge setting of chassis, the lateral surface cover of lateral wall is equipped with an insulating ring, the insulating ring is keeping away from the lateral surface of lateral wall is provided with first ring groove be provided with first cyclic annular discharge electrode in the first ring groove, with another discharge electrode joint opposite in polarity of cyclic annular discharge electrode is in the chassis surface. The first annular clamping groove has a limiting effect on the annular discharge electrode, and the groove wall of the first annular clamping groove wraps the annular discharge electrode, so that the insulation effect is guaranteed, and the problems of position change and short circuit between the annular discharge electrode and the shell after the annular discharge electrode is assembled can be effectively avoided.

Further, first ring-shaped clamping groove can include annular first tank bottom surface, be in respectively lateral wall and first clamping groove lower wall on the first clamping groove that first tank bottom surface width direction's both edges set up, first tank bottom surface for the ring central axis of insulating ring has an inclination, the peripheral dimensions of lateral wall is greater than on the first clamping groove the peripheral dimensions of lateral wall under the first clamping groove. Therefore, when the annular discharge electrode is assembled in the first annular clamping groove, the annular discharge electrode can be pushed into the first annular clamping groove from the lower side wall of the first clamping groove with smaller peripheral dimension, so that the assembly is more convenient, and the assembly difficulty is reduced. In addition, the annular discharge electrode and the insulating ring can be in interference fit, so that the position of the annular discharge electrode on the shell can be further fixed, and the problem of short circuit between the annular discharge electrode and the shell due to position change of the annular discharge electrode is avoided.

Drawings

Fig. 1 is a schematic diagram of a neurostimulator of an embodiment of the present invention for performing neurostimulation.

Fig. 2 is a schematic cross-sectional view of a neurostimulator according to an embodiment of the present invention.

Fig. 3A is a schematic diagram of an insulating ring in a neurostimulator according to an embodiment of the invention.

Fig. 3B is a schematic cross-sectional view of the insulating ring shown in fig. 3A.

Fig. 4A is a schematic diagram of a circular discharge electrode in a neurostimulator according to an embodiment of the present invention.

Fig. 4B is a schematic cross-sectional view of the ring-shaped discharge electrode shown in fig. 4A.

Fig. 5A is a schematic diagram of a housing in a neurostimulator of an embodiment of the present invention.

Fig. 5B is a schematic cross-sectional view of the housing shown in fig. 5A.

Description of reference numerals:

100-a neurostimulator; 101-a positive electrode; 102-a negative electrode; 103-electric field lines; 200-skin; 300-tibial nerve; 10-a housing; 11-a chassis; 12-a side wall; 13-a second ring-shaped card slot; 13 a-second slot bottom; 13 b-a second card slot upper sidewall; 13 c-a second card slot lower side wall; 20-ring-shaped discharge electrodes; 21-a first end; 22-a second end; 22 a-a notch; 30-an insulating ring; 31-a first ring card slot; 31 a-first slot bottom face; 31 b-first card slot upper side wall; 31c — a first card slot lower sidewall; 32-through holes; 40-a feedthrough; 50-a battery; 60-electronic component assembly; 70-cover plate.

Detailed Description

The neural stimulator of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be understood that the drawings in the specification are in simplified form and are not to be taken in a precise scale, for the purpose of facilitating and distinctly claiming the embodiments of the present invention. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the structure in the figures is inverted or otherwise oriented (e.g., rotated), the exemplary term "at … …" can also include "at … …" and other orientational relationships.

The embodiment of the utility model provides a neural stimulator, neural stimulator belongs to implantable medical device, and after implanting the human body, usable neural stimulator forms the electric field in the target nerve tissue region to amazing target nerve tissue. The nerve stimulator can be implanted into different positions in a human body according to treatment needs, and related symptoms (such as epilepsy, overactive bladder or other applicable symptoms) can be treated through the control of the in-vitro program controller.

Fig. 1 is a schematic view of a neurostimulator according to an embodiment of the present invention. Referring to fig. 1, the neurostimulator 100 is illustratively used to treat overactive bladder (OAB), i.e., may be implemented as a tibial neurostimulator. In the treatment of overactive bladder, the nerve stimulator is implanted above the tibial nerve 300 under the skin 200 at the ankle position, and two discharge electrodes of the nerve stimulator form a current loop through human tissue, so that the tibial nerve can be stimulated (or neuromodulated) by pulse discharge. Illustratively, the discharge electrode of the neurostimulator 100 comprises a positive electrode 101 and a negative electrode 102, the positive electrode 101 is arranged on the side surface of the neurostimulator 100 and is annular, and the negative electrode 102 is arranged on the surface of the neurostimulator 100 opposite to the tibial nerve 300 and is, for example, in the shape of a circular sheet. In operation, an electric field is formed between the positive electrode 101 and the negative electrode 102, as indicated by electric field lines 103 in fig. 1. The electric field stimulates the tibial nerve 300, and the nerve therapy for overactive bladder is performed. It should be noted that the embodiments of the present invention mainly solve the problem that a short circuit is easily caused between the annular discharge electrode disposed on the outer side surface of the neurostimulator and the housing connected to another discharge electrode, and therefore, the assembly method between the annular discharge electrode and the housing of the neurostimulator will be mainly described. The circuit structure and operation of the neurostimulator are not described in detail, and the circuit structure and operation of the neurostimulator can adopt the public technology in the field.

Fig. 2 is a schematic cross-sectional view of a neurostimulator according to an embodiment of the present invention. Referring to fig. 2, the neurostimulator of the embodiment of the present invention includes a housing 10, the housing 10 includes a chassis 11 and an edge the side wall 12 of the edge setting of the chassis 11, the lateral surface cover of the side wall 12 is equipped with an insulating ring 30, the insulating ring 30 is provided with a first ring groove 31 along the circumferential direction at the lateral surface of keeping away from the side wall 12. The neurostimulator further comprises an annular discharge electrode 20 sleeved in the first annular clamping groove 31 and another discharge electrode (such as "negative electrode" shown in fig. 1, and not shown in fig. 2) with a polarity opposite to that of the annular discharge electrode 20, wherein the another discharge electrode is bonded on the surface of the chassis 11 of the housing 10, for example, by welding or conductive adhesive bonding, so as to perform neurostimulation by forming an electric field as shown in fig. 1 during operation. In the present embodiment, the circular discharge electrode 20 is, for example, a positive electrode and the discharge electrode welded to the surface of the base plate 11 is, for example, a negative electrode in the electric field generated by the nerve stimulator, but in another embodiment, the circular discharge electrode 20 may also be a negative electrode and the discharge electrode joined to the surface of the base plate 11 is a positive electrode.

The housing 10 may be made of titanium metal or other suitable material. The insulating ring 30 is made of, for example, silicon. The annular discharge electrode 20 is made of, for example, stainless steel. In this embodiment, the annular discharge electrode 20 can be electrically connected to the corresponding circuit terminal located on the inner side of the housing 10 (in the opening formed by the bottom plate 11 and the side wall 12) through the feedthrough 40, and the insulating ring 30 has a through hole 32 for the feedthrough 40 to pass through.

Also shown in fig. 2 are a battery 50, an electronic component assembly 60, and a cover plate 70 disposed on the side wall 12 and covering the housing 10, the housing 10 and the cover plate 70 forming a sealed structure, the battery 50 and the electronic component assembly 60 being disposed in the sealed structure and electrically connected to the annular discharge electrode 20 through the feed-through 40. In addition to the components shown in fig. 2, the neurostimulator may further include a plastic casing (e.g., made of silicone) covering the housing 10 and the cover plate 70, wherein an opening on the plastic casing exposes the two discharge electrodes.

Referring to fig. 2, in the neurostimulator of the embodiment of the present invention, the first ring groove 31 disposed on the outer side surface of the insulating ring 30 away from the side wall 12 of the housing 10 can play a limiting role for the annular discharge electrode 20, and the groove wall of the first ring groove 31 wraps the annular discharge electrode 20, so as to ensure the insulation effect, and effectively avoid the problems of the position movement of the annular discharge electrode 20 and the short circuit between the annular discharge electrode 20 and the housing 10.

Further, as shown in fig. 2, in some embodiments, in order to facilitate the assembly of the annular discharge electrode 20 into the first annular groove 31 and avoid the relative displacement between the annular discharge electrode 20 and the insulating ring 30 during the assembly process, which may cause the annular discharge electrode 20 to contact the housing 10, the insulating ring 30 has a flared structure with a larger end and a smaller end on the outer side surface of the assembled annular discharge electrode 20, so as to sleeve the annular discharge electrode 20 into the first annular groove 31 on the outer side surface of the insulating ring 30 from the smaller side of the flared structure, which may facilitate and speed the assembly process. In the embodiment shown in fig. 2, the outer side and the inner side of the insulating ring 30 (the inner side refers to the side surface contacting the sidewall 12 of the housing 10) are both in a trumpet shape and have the same opening direction, but not limited thereto, in another embodiment, the outer side of the insulating ring 30 is in a trumpet shape and the inner side is in a cylindrical shape. The magnitude of the flare opening can be represented by the angle of inclination (or deflection) of the respective side of the insulator ring 30 relative to the ring central axis (shown in phantom in fig. 3B) of the insulator ring 30.

Fig. 3A is a schematic diagram of an insulating ring in a neurostimulator according to an embodiment of the invention. Fig. 3B is a schematic cross-sectional view of the insulating ring shown in fig. 3A. Fig. 3B here shows a longitudinal section through the ring center axis of the insulating ring 30. For example, the radial dimensions of the insulation ring 30 at different positions in the width direction may be the same or different, taking the ring center axis of the insulation ring 30 as the longitudinal axis. In the present embodiment, the radial dimension of the upper end of the insulating ring 30 in the width direction is larger than the radial dimension of the lower end.

Referring to fig. 3A and 3B, in the present embodiment, the insulating ring 30 is a closed loop structure, and the ring is provided with a through hole 32 for the feed-through 40 to pass through. The first ring-shaped slot 31 disposed on the outer side surface of the insulation ring 30 includes a first slot bottom surface 31a, a first slot upper side wall 31b and a first slot lower side wall 31c disposed at both edges of the first slot bottom surface 31a in the width direction, respectively, the first slot bottom surface 31a has an inclination angle α with respect to the ring central axis of the insulation ring 30, and the outer peripheral dimension of the first slot upper side wall 31b is greater than the outer peripheral dimension of the first slot lower side wall 31 c. The first card slot upper side wall 31b and the first card slot lower side wall 31c are, for example, both arranged along the circumference of the first slot bottom surface 31a, for example, both are annular, and the difference between the maximum radii of the first card slot upper side wall 31b and the first card slot lower side wall 31c (where the circle center corresponding to the radius is located on the ring center axis of the insulating ring 30) is, for example, about 0.2mm to 0.5 mm. The heights of the first card slot upper side wall 31b and the first card slot lower side wall 31c (i.e., the distance from the top end of the first slot bottom surface 31a to the first slot bottom surface 31 a) may be the same or different, and here, for example, are the same, i.e., the depths of the first card slot 31 at the first card slot upper side wall 31b and the first card slot lower side wall 31c are the same, so as to ensure the limiting effect of the two ends of the first card slot 31 on the annular discharge electrode 20.

Considering that the design requirement cannot be realized when the inclination angle alpha is too small, and the size of the overall structure of the nerve stimulator is increased when the inclination angle alpha is too large, the inclination angle alpha can be set to be in the range of 3-8 degrees.

Fig. 4A is a schematic diagram of a circular discharge electrode in a neurostimulator according to an embodiment of the present invention. Fig. 4B is a schematic cross-sectional view of the ring-shaped discharge electrode shown in fig. 4A. Fig. 4B here shows a longitudinal section through the ring center axis of the ring-shaped discharge electrode 20. Referring to fig. 2, 4A and 4B, in order to better fit and facilitate installation with the insulating ring 30, the annular discharge electrode 20 may also adopt a horn-shaped structure with a large end and a small end, so that when the annular discharge electrode 20 is assembled to the first annular clamping groove 31 on the insulating ring 30, the large horn mouth of the annular discharge electrode 20 can easily pass through the small horn mouth of the insulating ring 30, in the assembling process, the large horn mouth of the annular discharge electrode 20 is gradually pushed towards the large horn mouth of the insulating ring 30 and enters the first annular clamping groove 31, and after the assembly is completed, the annular discharge electrode 20 and the insulating ring 30 are tightly fitted, as shown in fig. 2, by matching the size of the horn-shaped structure and selecting a proper assembling mode, after the annular discharge electrode is sleeved in the first annular clamping groove 31, the inner side surface of the annular discharge electrode 20 and the first groove bottom surface 31a are tightly fitted.

Referring to fig. 2 and 4A, in the present embodiment, radial dimensions of the annular discharge electrode 20 in the width direction are different, for example, in order to form the above-mentioned trumpet-shaped structure with one larger end and one smaller end, where the annular discharge electrode 20 has, for example, a first end 21 with a relatively larger outer peripheral dimension and a second end 22 with a relatively smaller outer peripheral dimension, after being assembled in the first annular card slot 31, the first end 21 of the annular discharge electrode 20 is adjacent to the first card slot upper side wall 31b on the insulating ring 30, and the second end 22 is adjacent to the first card slot lower side wall 31c on the insulating ring 30. The inner side surface of the annular discharge electrode 20 has, for example, an inclination angle with respect to a ring center axis (shown by a dotted line in fig. 4B) of the annular discharge electrode 20, which may be set to be the same as the inclination angle α of the first groove bottom surface 31a of the first ring groove 31 with respect to the ring center axis of the insulating ring 30. In order to fix the position of the annular discharge electrode 20 on the insulating ring 30, the depth of the first ring-shaped clamping groove 31 may be set to be greater than or equal to the thickness of the annular discharge electrode 20. Illustratively, the thickness of the annular discharge electrode 20 is about 0.2mm to 0.8mm, and more specifically, for example, 0.3 mm.

In consideration of the fact that the annular discharge electrode 20 and the insulating ring 30 are likely to be displaced in the clearance fit, it is preferable that the annular discharge electrode 20 and the insulating ring 30 are in an interference fit, and the interference fit can further secure the position of the annular discharge electrode 20 relative to the insulating ring 30, thereby avoiding the problem of short-circuiting between the annular discharge electrode 20 and the outer case 10 due to the change in the position of the annular discharge electrode 20. In addition, as shown in fig. 4A, in order to facilitate the small flare (i.e., the second end 22) of the annular discharge electrode 20 to pass through the small flare of the insulating ring 30 during the assembling process and deform the small flare of the annular discharge electrode 20 to achieve an interference fit, the second end 22 of the annular discharge electrode 20 is provided with at least two notches 22a, for example, two, three, or more than four notches 22 a. All the slits 22a provided at the second end 22 of the annular discharge electrode 20 are preferably uniformly distributed in the circumferential direction so as to prevent the second end 22 of the annular discharge electrode 20 from being deformed due to stress concentration after the interference-fitting of the annular discharge electrode 20.

Referring to fig. 2, in some embodiments, not only the first annular groove 31 is disposed on the outer side surface of the insulating ring 30 to define the position of the annular discharge electrode 20, but also, in order to define the position of the insulating ring 30 on the housing 10, the housing 10 is also disposed on the outer side surface of the side wall 12 for sleeving the insulating ring 30, and is also disposed with a groove, which is referred to as a second annular groove 13, and after the insulating ring 30 is assembled on the housing 10, the insulating ring 30 is sleeved in the second annular groove 13.

Fig. 5A is a schematic diagram of a housing in a neurostimulator of an embodiment of the present invention. Fig. 5B is a schematic cross-sectional view of the housing shown in fig. 5A. Fig. 5B here shows in particular a longitudinal section through the ring center axis (indicated by a dashed line in fig. 5B) of the housing 10. Referring to fig. 2, 5A and 5B, the housing 10 includes a bottom plate 11 and a side wall 12 disposed along an edge of the bottom plate 11, an outer side surface of the side wall 12 has a second annular card slot 13, and the second annular card slot 13 includes a second slot bottom 13a in an annular shape, and a second card slot upper side wall 13B and a second card slot lower side wall 13c disposed at both edges of the second slot bottom 13a in a width direction. Second card slot upper side wall 13b and second card slot lower side wall 13c are, for example, both circumferentially disposed along second slot bottom surface 13a, e.g., both annular, for example, to facilitate second slot bottom surface 13a having an angle of inclination with respect to the ring center axis of side wall 12.

Lateral surface or the whole flared structure that also can set up to lateral wall 12 of lateral wall 12, specifically, second tank bottom surface 13a of second ring-shaped card groove 13 can have an inclination for the ring central axis of lateral wall 12, lateral wall 13 b's peripheral dimension is greater than on the second card groove lateral wall 13 c's peripheral dimension under the second card groove, and lateral wall 13b is located big horn mouth on the second card groove promptly, and lateral wall 13c is located little horn mouth under the second card groove. The difference between the maximum radii of the second card slot upper side wall 13b and the second card slot lower side wall 13c (where the center of the circle corresponding to the radius is located on the ring center axis of the side wall 12) is, for example, about 0.2mm to 0.5 mm. The inclination angle corresponding to the second groove bottom surface 13a here ranges, for example, from 3 ° to 8 °, and this inclination angle may be set to be the same as the inclination angle of the inner side surface of the insulating ring 30 with respect to the ring center axis of the insulating ring 30, in order to make the inner side surface of the insulating ring 30 closely adhere to the second groove bottom surface 13a after the insulating ring 30 is fitted in the second ring-shaped neck 13. Like this, when assembling insulating ring 30 on shell 10, insulating ring 30's big horn mouth can easily pass the little horn mouth of lateral wall 12 lateral surfaces, and in the assembling process, make insulating ring 30's big horn mouth impel to the big horn mouth of shell 10 lateral surface gradually to in getting into second annular draw-in groove 13, after the assembly targets in place, insulating ring 30's big horn mouth can realize closely cooperating with the big horn mouth of shell 10 lateral surface. Preferably, an interference fit may be provided between the insulating ring 30 and the housing 10, so as to further ensure that the insulating ring 30 is fixed in position on the housing 10 after the assembly is completed.

Referring to fig. 2, 5A and 5B, a groove 10a may be provided at an outer side surface of the case 10 (a side surface of the sidewall 12 close to the insulating ring 30), particularly, at a position of the second groove bottom surface 13 where the feedthrough 40 is planned to be assembled, a bottom of the groove 10a may be provided with a feedthrough hole for the feedthrough 40 to pass through, so that one end of the feedthrough 40 is connected to a corresponding circuit terminal at an inner side of the case 10, and the other end of the feedthrough 40 passes through the through hole 32 provided in the insulating ring 30 and is electrically connected to the annular discharge electrode 20. An insulator is provided in the recess 10a, and a feed-through 40 is embedded in the insulator.

The insulator, feedthrough 40, and housing 10 may be sealed by a brazing process. Further, referring to fig. 2 and 4A, the back surface of the annular discharge electrode 20 may be provided with an opening, which may or may not penetrate the annular discharge electrode 20, at a position in contact with the feed-through 40. Illustratively, after the case 10, the feed-through 40, the battery 50, the electronic component assembly 60 and the cover plate 70 form a closed structure, one end of the feed-through 40 away from the bottom of the groove 10a is exposed from the insulator in the groove 10a, the feed-through 40 passes through the through hole 32 in the insulating ring 30 after the insulating ring 30 is assembled on the outer side of the case 10, and the feed-through 40 is inserted into the opening in the corresponding position on the annular discharge electrode 20 and contacts the annular discharge electrode 20 after the annular discharge electrode 20 is assembled on the outer side of the insulating ring 30. In order to ensure electrical connectivity of the feedthrough 40 and the annular discharge electrode 20, the two may be electrically connected by a welding process.

In the neurostimulator shown in fig. 2, the insulating ring 30 adopts a horn-shaped structure with a large end and a small end (the outer side surface of the insulating ring 30 forms an inclination angle α with the central axis of the ring), and the outer side surface of the insulating ring 30 is provided with a first annular clamping groove 31, so that the annular discharge electrode 20 is convenient to assemble and realize tight fit and limit; the annular discharge electrode 20 also adopts a horn-shaped structure with a larger end and a smaller end (the inner side surface of the annular discharge electrode 20 forms an inclination angle with the central axis of the ring), so that the annular discharge electrode is convenient to assemble on the insulating ring 30, and the second end 22 (the small-sized end) of the annular discharge electrode 20 is provided with a cutting groove 22a, so that the second end 22 of the annular discharge electrode 20 is convenient to be assembled on the insulating ring 30 in an interference fit manner, and the position of the annular discharge electrode 20 on the shell 10 is ensured to be fixed; in addition, the lateral wall 12 of the housing 10 also adopts a trumpet-shaped structure (the outer side surface of the lateral wall 12 forms an inclination angle with the central axis of the ring), compared with a cylindrical shape, the insulating ring 30 is more convenient to assemble and interference assembly is facilitated due to the trumpet-shaped structure of the housing 10, in addition, the second annular clamping groove 13 is arranged on the outer side surface of the lateral wall 12, and the position of the insulating ring 30 on the housing 10 can be limited by assembling the insulating ring 30 into the second annular clamping groove 13.

To sum up, the embodiment of the present invention describes a neurostimulator, which can better limit the position of the circular discharge electrode 20 on the housing 10, improve the insulation effect, and effectively avoid the position change of the circular discharge electrode 20 and the short circuit between the circular discharge electrode 20 and the housing 10.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the claims, and any person skilled in the art can use the above-disclosed method and technical contents to make possible changes and modifications to the technical solution of the present invention without departing from the spirit and scope of the present invention, and therefore, any simple modifications, equivalent changes and modifications made to the above embodiments by the technical substance of the present invention all belong to the protection scope of the technical solution of the present invention.

Claims

1. A neurostimulator, comprising:

the shell comprises a chassis and a side wall arranged along the edge of the chassis, the outer side surface of the side wall is sleeved with an insulating ring, and the outer side surface of the insulating ring far away from the side wall is provided with a first annular clamping groove;

an annular discharge electrode arranged in the first annular clamping groove; and the number of the first and second groups,

2. The neurostimulator of claim 1, wherein the first annular slot comprises an annular first slot bottom surface, a first slot upper side wall and a first slot lower side wall respectively disposed at two widthwise edges of the first slot bottom surface, the first slot bottom surface having an inclination angle with respect to the ring central axis of the insulating ring, the first slot upper side wall having a peripheral dimension greater than a peripheral dimension of the first slot lower side wall.

3. The neurostimulator of claim 2, wherein the angle of inclination is in the range of 3 ° to 8 °.

4. The neurostimulator of claim 2, wherein an inner side surface of the annular discharge electrode abuts a first slot bottom surface of the first annular slot, the annular discharge electrode having a first end adjacent an upper side wall of the first slot and a second end adjacent a lower side wall of the first slot.

5. The neurostimulator of claim 4, wherein the annular discharge electrode and the insulating ring are an interference fit.

6. The neurostimulator of claim 5 wherein the annular discharge electrode is provided with at least two slots at the second end.

7. The neurostimulator of claim 2, wherein the lateral side of the side wall is provided with a second annular groove, the insulating ring fitting within the second annular groove.

8. The neurostimulator of claim 7, wherein the second annular slot comprises an annular second slot bottom surface, a second slot upper side wall and a second slot lower side wall respectively disposed at both widthwise edges of the second slot bottom surface, the second slot bottom surface having an inclination angle with respect to the ring central axis of the side walls, the second slot upper side wall having a peripheral dimension greater than the peripheral dimension of the first slot lower side wall.

9. The neurostimulator of claim 8, wherein the angle of inclination is in the range of 3 ° to 8 °.

10. The neural stimulator of any one of claims 1 to 9, wherein the neural stimulator is a tibial neural stimulator.