Peripheral nerve stimulator

Abstract

The invention relates to a peripheral nerve stimulator. The peripheral nerve stimulator comprises a control device and at least two electrode leads, the control device is configured to generate an electrical stimulation pulse. The at least two electrode leads are electrically coupled to the control device and configured to be at least partially implanted within the patient to deliver electrical stimulation pulses to at least two neural branches, respectively, within the patient. The at least two electrode leads deliver electrical stimulation pulses to the at least two nerve branches of the nerve plexus at the same time, so that stimulation of the nerve branches is more comprehensive, and the stimulation effect of the peripheral nerve stimulator on the nerve plexus of peripheral nerves is enhanced.

Description

Technical Field

[0001] The present disclosure relates to the field of medical equipment, and in particular, to a peripheral nerve stimulator. Background Art

[0002] A neurostimulator is a medical device used to relieve pain or manage symptoms of other neurological disorders. A neurostimulator consists of a pulse generator and electrode leads. The electrode leads can be partially or fully implanted in the patient's body through surgery. During treatment, electrical stimulation pulses are generated by the pulse generator and delivered to the target tissue area through the electrode leads.

[0003] Neurostimulators can be used to stimulate peripheral nerves, for example, dorsal root ganglia branching from the spinal cord. However, conventional neurostimulators have poor stimulation effects on peripheral nerves, so there is a need to improve the stimulation effect of peripheral nerves. Summary of the invention

[0004] In view of this, the present disclosure provides a peripheral nerve stimulator, aiming to improve the stimulation effect on peripheral nerves.

[0005] The present disclosure provides a peripheral nerve stimulator, comprising a control device and at least two electrode leads. The control device is configured to generate electrical stimulation pulses. The at least two electrode leads are electrically coupled to the control device and configured to be at least partially implanted in a patient's body to deliver electrical stimulation pulses to at least two nerve branches in the patient's body, respectively.

[0006] At least two electrode leads simultaneously deliver electrical stimulation pulses to at least two nerve branches of the nerve plexus, so that the stimulation of the nerve branches is more comprehensive, thereby helping to enhance the stimulation effect of the peripheral nerve stimulator on the nerve plexus.

[0007] In a possible implementation, each electrode lead is provided with at least one anchor, and the at least one anchor is configured to anchor the electrode lead to the patient's tissue.

[0008] The anchor anchors the electrode lead to the patient's tissue, which can limit the displacement of the electrode lead, thereby preventing the electrode contacts on the electrode lead that deliver electrical stimulation from moving and affecting the stimulation effect of the peripheral nerve stimulator.

[0009] In a possible implementation, each anchoring member includes a fixed portion and a plurality of movable portions. The fixed portion surrounds and is fixed to the electrode lead, the plurality of movable portions are spaced apart in a direction surrounding the electrode lead, one end of each movable portion is connected to the fixed portion, and the movable portion gradually expands outward in a direction away from the fixed portion.

[0010] One end of the movable part is connected to the fixed part, and the other end is in contact with the patient's tissue. When the electrode lead fixed by the fixed part has a tendency to move in a particular direction, the movable part can prevent the electrode lead from moving. In addition, the end of the movable part in contact with the patient's tissue is a free end, which can move when implanted in the patient's tissue, that is, it can be retracted inwards, thereby reducing the circumferential size, which helps to reduce the invasiveness of the implanted electrode lead to the patient's tissue.

[0011] In a possible implementation, the peripheral nerve stimulator further includes a connector, at least two electrode leads are connected to the connector, and the control device further includes a connecting portion, and the connector and the connecting portion are pluggably connected.

[0012] In this way, when implanting a peripheral nerve stimulator, the connector and the connecting part can be operated separately, and then connected after the connector and the connecting part are implanted in the target position, which helps to reduce the difficulty of the operation.

[0013] In one possible implementation, the connecting portion defines a docking recess for receiving the connector, and the peripheral nerve stimulator further includes a first seal that seals a gap between the connector and an inner surface of the docking recess.

[0014] One side of the docking recess receives the part connected to the control device, and the other side receives the connector. A first seal is provided in the gap between the connector and the inner surface of the docking recess, which can prevent tissue fluid from entering the control device through the gap between the connector and the inner surface of the docking recess and destroying the working environment of the control device.

[0015] In one possible implementation, the connector includes a connector body and a plurality of pins, the connector body is provided with a guide recess, the plurality of pins are arranged in the guide recess, the connecting portion includes a guide boss located in the docking recess, the guide boss is provided with a plurality of pin holes, the guide boss is inserted into the guide recess, and the plurality of pins are respectively inserted into the plurality of pin holes.

[0016] Through the guiding recess and the guiding boss, the pin hole on the connecting part can guide the insertion of the pin, thereby making the connection between the connecting part and the connector more accurate.

[0017] In a possible implementation, the peripheral nerve stimulator further includes a second seal member that seals a gap between an inner surface of the guide recess and an outer surface of the guide boss.

[0018] One side of the guide boss in the connection part is connected to the control device, and the other side is received by the guide recess. A second sealing member is arranged in the gap between the inner surface of the guide recess and the outer surface of the guide boss, so as to prevent tissue fluid from entering the control device through the gap between the inner surface of the guide recess and the outer surface of the guide boss, thereby damaging the working environment of the control device.

[0019] In a possible implementation, the control device further includes a pair of clamping plates, which are configured to releasably clamp the connector body, wherein in the plugging and unplugging direction, the pair of clamping plates are directly opposite to the second sealing member across the connector body.

[0020] The clamping force transmitted by the pair of clamping plates prevents the connector body from being easily dislodged from the docking recess of the connection portion. In addition, the pair of clamping plates face the second seal across the connector body, so that the clamping force formed by the pair of clamping plates can squeeze the second seal, causing it to deform and fill the gap between the inner surface of the guide recess and the outer surface of the guide boss, thereby improving the sealing performance of the second seal.

[0021] In a possible implementation, each electrode lead is provided with a length compensation portion extending in a spiral shape.

[0022] After the peripheral nerve stimulator is implanted, the patient's daily activities will cause the tissue to slightly shift, which will change the relative position of the target tissue and the electrode contacts, thereby affecting the treatment effect. In actual applications, the compensation required for different electrode leads may be different. According to the above implementation method, the spiral structure of the length compensation part can absorb or compensate for the displacement of the electrode lead, and each electrode lead can be retracted relatively independently, so that the stimulation effect of the peripheral nerve stimulator is affected as little as possible by the displacement of the electrode lead.

[0023] In a possible implementation, the electrode lead is provided with at least one anchor configured to anchor the electrode lead to the patient's tissue, and the anchor closest to the control device is located on a side of the length compensation portion facing away from the control device.

[0024] In this way, when the length compensation part absorbs or compensates for the displacement of the electrode lead, the displaced part can be limited between the anchor and the connector in the length direction, so that the stimulation effect of the peripheral nerve stimulator is affected as little as possible by the displacement of the electrode lead.

[0025] In one possible implementation, each electrode lead sleeve is provided with at least one elastic member, which includes an elastic member body and two fixed ends, and the two fixed ends are respectively fixed to the electrode lead, so that when the elastic member is in a non-stretched state, the portion of the electrode lead located between the two fixed ends is bent.

[0026] According to the above implementation, the elastic restoring force of the electrode lead is provided by the elastic member, rather than mainly coming from the structure of the electrode lead itself, which helps to reduce the difficulty of implementing the electrode lead.

[0027] In a possible implementation, the peripheral nerve stimulator also includes a twisting device, which includes a fixed shell, a rotating part and a torsion spring. The rotating part is partially accommodated by the fixed shell, the rotating part is provided with a through hole, the electrode lead passes through the through hole, the bottom of the rotating part is provided with a groove, and a connecting column extending downward is provided in the groove. The torsion spring is sleeved on the connecting column, and the two ends of the torsion spring are respectively fixed to the fixed shell and the rotating part.

[0028] During implantation, the fixing shell can be sewn onto the tissue, and the length direction of the through hole is at an angle to the length direction of the electrode lead in its natural state, so that the torsion spring is deformed under force. When the patient's activity causes the electrode lead to be stretched, the torsion spring will further deform, so that the electrode lead is straightened to compensate for the displacement caused by the patient's activity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments are briefly introduced below.

[0030] It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be viewed as limiting the scope.

[0031] It should also be understood that the same or similar reference numerals are used in the drawings to represent the same or similar elements.

[0032] It should also be understood that the drawings are merely schematic and that the sizes and proportions of elements in the drawings are not necessarily accurate.

[0033] Figure 1 It is a schematic structural diagram of a peripheral nerve stimulator according to an embodiment of the present disclosure.

[0034] Figure 2 yes Figure 1 Schematic diagram of the structure of the peripheral nerve stimulator in another perspective.

[0035] Figure 3 yes Figure 1 An exploded diagram of a peripheral nerve stimulator in Figure 2.

[0036] Figure 4 yes Figure 1 An exploded diagram of a peripheral nerve stimulator in Figure 2.

[0037] Figure 5 yes Figure 1 Schematic diagram of the structure of a portion of a peripheral nerve stimulator.

[0038] Figure 6 yes Figure 1 Top view of a peripheral nerve stimulator in .

[0039] Figure 7 It is along Figure 6 Sectional view cut along line AA.

[0040] Figure 8 It is a schematic structural diagram of a peripheral nerve stimulator according to a first variant of the present disclosure.

[0041] Fig. 9 It is a schematic structural diagram of a peripheral nerve stimulator according to a second variant of the present disclosure.

[0042] Fig.10 It is a schematic structural diagram of a peripheral nerve stimulator according to the third variant of the present disclosure.

[0043] Fig.11 yes Fig.10 Schematic diagram of the structure of a portion of the electrode lead.

[0044] Fig.12 It is a schematic structural diagram of a peripheral nerve stimulator according to the fourth variant of the present disclosure.

[0045] Fig.13 yes Fig.12 Cross-sectional view of the twisting device.

[0046] Fig.14A and Fig. 14B yes Fig.12 Schematic diagram of the structure of the twisting device and electrode leads. DETAILED DESCRIPTION

[0047] Neurostimulators consist of a pulse generator and electrode leads, and are used in the medical field to relieve pain or manage symptoms of other neurological diseases. The electrode leads can be partially or completely implanted in the patient's body through surgery. During treatment, electrical stimulation pulses are generated by the pulse generator and delivered to the target tissue area through the electrode leads.

[0048] Neurostimulators can be used to stimulate peripheral nerves, for example, dorsal root ganglia that branch out from the spinal cord. However, conventional neurostimulators have poor stimulation effects on peripheral nerve stimulation. The inventors found that peripheral nerves are usually nerve plexuses composed of multiple nerve branches. Conventional neurostimulators only have a single electrode lead, which cannot fully cover multiple nerve branches, resulting in poor effects.

[0049] In view of this, the present disclosure provides a peripheral nerve stimulator, aiming to improve the stimulation effect on peripheral nerves.

[0050] The following is an exemplary description of the embodiments of the present disclosure in conjunction with the accompanying drawings. It should be understood that the present disclosure can be implemented in a variety of ways and should not be construed as being limited to the embodiments described here. The embodiments described here are only for a more thorough and clear understanding of the present disclosure.

[0051] refer to Figure 1 The peripheral nerve stimulator 100 provided by the present disclosure includes a control device 10 and at least two electrode leads 20. The control device 10 (i.e., the aforementioned pulse generator) is configured to generate electrical stimulation pulses. The at least two electrode leads 20 are electrically coupled to the control device 10 and configured to be at least partially implanted in the patient's body to deliver electrical stimulation pulses to at least two nerve branches in the patient's body, respectively. At least two electrode leads 20 simultaneously deliver electrical stimulation pulses to at least two nerve branches of a nerve plexus, so that the stimulation of the nerve branches is more comprehensive, thereby helping to enhance the stimulation effect of the peripheral nerve stimulator 100 on the nerve plexus.

[0052] Peripheral nerves refer to nerve tissues other than spinal nerves, such as sacral nerve plexuses, dorsal root ganglia, and brachial plexuses, etc. Of course, the peripheral nerve stimulator 100 provided in the present disclosure can also be used to stimulate non-nerve plexuses.

[0053] Continue to refer Figure 1 Each electrode lead 20 is provided with at least one anchor 30, and at least one anchor 30 is configured to anchor the electrode lead 20 to the patient's tissue. The anchor 30 anchors the electrode lead 20 to the patient's tissue, which can limit the displacement of the electrode lead 20, thereby preventing the electrode contact 21 on the electrode lead 20 that delivers electrical stimulation from moving and affecting the stimulation effect of the peripheral nerve stimulator 100.

[0054] It can be understood that the control device 10 in this embodiment is not limited to generating electrical stimulation pulses. In other examples, the electrode lead 20 may also include multiple heating devices, which can heat the electrode contacts 21 under the control of the control device 10 to apply thermal stimulation to the tissue. For example, the heating device may be an electric heating wire.

[0055] refer to Figure 2 Each anchor 30 includes a fixed portion 31 and a plurality of movable portions 32. The fixed portion 31 surrounds and is fixed to the electrode lead 20, and the plurality of movable portions 32 are spaced apart in a direction surrounding the electrode lead 20, one end of each movable portion 32 is connected to the fixed portion 31, and the movable portions 32 gradually expand outward in a direction away from the fixed portion 31.

[0056] One end of the movable portion 32 is connected to the fixed portion 31, and the other end is in contact with the patient's tissue. When the electrode lead 20 fixed by the fixed portion 31 has a tendency to move in a particular direction, the movable portion 32 can prevent the electrode lead 20 from moving. In addition, the end of the movable portion 32 in contact with the patient's tissue is a free end, which can move when implanted in the patient's tissue, that is, it can be retracted inwards, thereby reducing the circumferential size, which helps to reduce the invasiveness of the implanted electrode lead 20 to the patient's tissue.

[0057] As a non-limiting example, the electrode lead 20 can be implanted percutaneously using an introducer. In order to reduce the invasiveness of the implanted electrode lead to the patient's tissue, the movable portion 32 of the anchor 30 can be constructed to be deformed inward when subjected to an external force. In this way, during the implantation of the electrode lead 20, the movable portion 32 can be placed in an introducer with a smaller inner diameter, and the free end of the movable portion 32 is squeezed and deformed inward. After the electrode lead 20 is implanted at the target position, the introducer is withdrawn, and the free end of the movable portion 32 returns to its original state, contacts the patient's tissue, and together with the fixed portion 31 limits the displacement of the electrode lead.

[0058] refer to Figure 3 The peripheral nerve stimulator 100 further includes a connector 40, at least two electrode leads 20 are connected to the connector 40, and the control device 10 further includes a connecting portion 11, and the connector 40 and the connecting portion 11 are pluggably connected. In this way, when the peripheral nerve stimulator 100 is implanted, the connector 40 and the connecting portion 11 can be operated separately, and the connector 40 and the connecting portion 11 can be connected after being implanted in the target position, which helps to reduce the difficulty of the operation.

[0059] refer to Figure 4 The outer sleeve 111 of the connecting part 11 defines a docking recess 111a for receiving the connector 40. The peripheral nerve stimulator 100 further includes a first seal 43, which seals the gap between the connector 40 and the inner surface of the docking recess 111a. One side of the docking recess 111a receives the portion connected to the control device 10, and the other side receives the connector 40. The first seal 43 is provided in the gap between the connector 40 and the inner surface of the docking recess 111a, which can prevent tissue fluid from entering the control device 10 from the gap between the connector 40 and the inner surface of the docking recess 111a, thereby destroying the working environment of the control device 10.

[0060] Continue to refer Figure 4 The connector 40 includes a connector body 41 and a plurality of pins 42. The connector body 41 is provided with a guide recess 411. The plurality of pins 42 are provided in the guide recess 411. The connection part 11 includes a guide boss 112 located in the docking recess 111a. The guide boss 112 is provided with a plurality of pin holes 1121. The guide boss 112 is inserted into the guide recess 411. The plurality of pins 42 are respectively inserted into the plurality of pin holes 1121. Through the guide recess 411 and the guide boss 112, the pin holes 1121 on the connection part 11 can guide the insertion of the pins 42, thereby making the connection between the connection part 11 and the connector 41 more accurate.

[0061] Continue to refer Figure 4The peripheral nerve stimulator 100 further includes a second seal 113, which seals the gap between the inner surface of the guide recess 411 and the outer surface of the guide boss 112. One side of the guide boss 112 in the connecting portion 11 is connected to the control device 10, and the other side is received by the guide recess 411. The second seal 113 is provided in the gap between the inner surface of the guide recess 411 and the outer surface of the guide boss 112, which can prevent tissue fluid from entering the control device 10 from the gap between the inner surface of the guide recess 411 and the outer surface of the guide boss 112, thereby destroying the working environment of the control device 10.

[0062] refer to Figures 5 to 7 The control device 10 may further include a pair of clamps 12, which are configured to releasably clamp the connector body 41, wherein in the plug-in and unplugging direction, the pair of clamps 12 are directly opposite to the second seal 113 across the connector body 41. The clamping force transmitted by the pair of clamps 12 prevents the connector body 41 from being easily dislodged from the docking recess 111a of the connecting portion 11. In addition, the pair of clamps 12 are directly opposite to the second seal 113 across the connector body 41, so that the clamping force formed by the pair of clamps 12 can squeeze the second seal 113, causing it to deform and fill the gap between the inner surface of the guide recess 411 and the outer surface of the guide boss 112, thereby improving the sealing performance of the second seal 113.

[0063] It is understood that there are many ways to provide the clamping force of the clamping plate 12, and the present disclosure does not specifically limit this. As an example, refer to Figure 5 , a pair of clamps 12 are fastened by bolts 13. It should be noted that the pair of clamps 12 are located inside the outer jacket 111. In order to tighten or loosen the bolts 13 through the outer jacket 111, the outer jacket 111 can be made of a soft material, such as thermoplastic polyurethane rubber. At the same time, the thickness of the portion of the outer jacket 111 covering the bolts 13 should be as small as possible, for example, less than or equal to 1 mm.

[0064] It should be understood that there are many ways to implement the peripheral nerve stimulator disclosed in the present invention, and it should not be construed as being limited to the embodiments described above. Figures 8 to 13 , Fig.14A and Fig. 14B , the modified examples of the present disclosure are illustrated. It should be noted that the aforementioned embodiment and the following modified examples have some common elements. In the following modified examples, these elements will continue to use the figure numerals in the aforementioned embodiment to omit repeated description.

[0065] After the peripheral nerve stimulator is implanted, the patient's daily activities will cause the tissue to move slightly, which will change the relative position of the target tissue and the electrode contacts, thus affecting the treatment effect. In actual applications, the compensation required for different electrode leads may be different.

[0066] refer to Figure 8 In the peripheral nerve stimulator 100a, each electrode lead 20a is provided with a length compensation portion 22 extending in a spiral shape. The spiral structure of the length compensation portion 22 can absorb or compensate for the displacement of the electrode lead 20a, and each electrode lead 20a can be relatively independently retracted, so that the stimulation effect of the peripheral nerve stimulator 100a is affected as little as possible by the displacement of the electrode lead 20a. Of course, the length compensation portion 22 can also be constructed in other forms, such as bending along the length direction. The present disclosure does not impose any particular limitation on this.

[0067] Continue to refer Figure 8 The electrode lead 20a is provided with at least one anchor 30, and the at least one anchor 30 is configured to anchor the electrode lead 20a to the patient's tissue, and the anchor 30 closest to the control device 10 is located on the side of the length compensation part 22 that is away from the control device 10. In this way, when the length compensation part 22 absorbs or compensates for the displacement of the electrode lead 20a, the displaced part can be limited between the anchor 30 and the connector 40 in the length direction, so that the stimulation effect of the peripheral nerve stimulator 100a is as little affected as possible by the displacement of the electrode lead 20a.

[0068] It is understandable that the number of anchors may be any number, and those skilled in the art should be able to make reasonable selections and designs based on actual needs to suit different actual situations, and the present disclosure does not impose any restrictions on this.

[0069] Furthermore, multiple anchors can be distributed at any position on multiple electrode leads, as long as the anchors can avoid electrode contacts and anchors on different electrode leads do not interfere with each other. Fig. 9 In the peripheral nerve stimulator 100b, the anchors 30 on the same electrode lead 20 can be opposite to each other in pairs, that is, the movable portion 32 of one anchor 30a gradually expands outward along the direction from the free end to the connection end of the electrode lead 20, and the other anchor 30b gradually expands outward along the direction from the connection end to the free end of the electrode lead 20, so as to achieve anchoring in two directions. Preferably, the anchors 30 that are opposite to each other in pairs can be closer to the free end than the multiple electrode contacts 21. In this way, the connection end of the electrode lead 20 is anchored by the control device 10, and the free end of the electrode lead 20 is anchored by the two anchors 30, and the anchoring effect is better.

[0070] It is understood that the two anchors are preferably close enough to the free end of the electrode lead. For example, the ratio D / L of the distance D from the free end to the two anchors to the length L of the electrode lead can be less than 1 / 10. Fig. 9 , D shown in the figure is the distance from the free end of the electrode lead to the anchor away from the free end.

[0071] refer to Fig.10 and Fig.11 In the peripheral nerve stimulator 100c, each electrode lead 20 is sleeved with at least one elastic member 23, the elastic member 23 includes an elastic member body 231 and two fixed ends 232, the two fixed ends 232 are respectively fixed to the electrode lead 20, so that in the non-stretched state of the elastic member 23, the portion of the electrode lead 20 located between the two fixed ends 232 is bent. According to the above implementation, the elastic restoring force of the electrode lead 20 is provided by the elastic member 23, rather than mainly from the structure of the electrode lead 20 itself, thereby reducing the difficulty of implementing the electrode lead.

[0072] Continue to refer Fig.10 A sleeve 230 may be provided outside the elastic member 23, and the sleeve 230 is constructed of a soft material, such as thermoplastic polyurethane rubber, to prevent the elastic member 23 from causing damage to the tissue during the expansion and contraction process.

[0073] It should be noted that the “non-stretched state” mentioned above may also be referred to as a natural state, that is, the state of the elastic member 23 when the electrode lead 20 is not stretched.

[0074] refer to Fig.12 and Fig.13 The peripheral nerve stimulator 100d may include a twisting device 24, which includes a fixed shell 243, a rotating member 241 and a torsion spring 242. The rotating member 241 is partially accommodated by the fixed shell 243. The rotating member 241 is provided with a through hole 2411, and the electrode lead 20d passes through the through hole 2411. The bottom of the rotating member 241 is provided with a groove 2412, and a connecting column 2413 extending downward is provided in the groove 2412. The torsion spring 242 is sleeved on the connecting column 2413, and the two ends of the torsion spring 242 are respectively fixed to the fixed shell 243 and the rotating member 241.

[0075] When the electrode lead 20d is implanted, the fixing shell 243 can be sewn on the tissue, and the length direction of the through hole 2411 is at an angle of 10 to 40 degrees with the length direction of the electrode lead 20d in its natural state, so that the torsion spring 242 is deformed under force. Fig.14A When the patient's activity causes the electrode lead 20d to be stretched, the torsion spring 242 will further deform, so that the electrode lead 20d is straightened. Fig.14A The state changes to Fig. 14B to compensate for the displacement caused by the patient's activities.

[0076] Continue to refer Fig.13On the outer wall of the fixing shell 243, a plurality of lugs 2431 are provided at intervals in the circumferential direction, and a thread hole 2432 is formed between each lug 2431 and the outer wall of the fixing shell 243, and the thread hole 2432 allows sutures to pass through. With the help of the thread hole 2432, the fixing shell 243 can be sutured on the tissue.

[0077] It should be understood that the term "including" and its variations used in the present disclosure are open inclusions, i.e., "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0078] It should be understood that although the terms “first” or “second” etc. may be used in the present disclosure to describe various elements (such as a first seal and a second seal), these elements are not defined by these terms, and these terms are only used to distinguish one element from another.

[0079] The protection scope of the present disclosure is not limited to the above-mentioned embodiments. Any changes or substitutions that can be conceived by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A peripheral nerve stimulator, characterized in that: include: a control device configured to generate electrical stimulation pulses; as well as At least two electrode leads are electrically coupled to the control device and are configured to be at least partially implanted in a patient's body to respectively deliver the electrical stimulation pulses to at least two nerve branches in the patient's body.

2. The peripheral nerve stimulator according to claim 1, characterized in that: Each electrode lead is provided with at least one anchor configured to anchor the electrode lead to the patient's tissue.

3. The peripheral nerve stimulator according to claim 2, characterized in that: Each anchor consists of: a fixing portion surrounding and fixed to the electrode lead; and A plurality of movable parts are distributed at intervals along a direction surrounding the electrode lead, one end of each movable part is connected to the fixed part, and the movable part gradually expands outwards along a direction away from the fixed part.

4. The peripheral nerve stimulator according to claim 1, characterized in that: The device further comprises a connector, to which the at least two electrode leads are connected, and the control device further comprises a connecting portion, to which the connector is pluggably connected.

5. The peripheral nerve stimulator according to claim 4, characterized in that: The connecting portion defines a docking recess for receiving the connector, and the peripheral nerve stimulator further includes a first seal that seals a gap between the connector and an inner surface of the docking recess.

6. The peripheral nerve stimulator according to claim 5, characterized in that: The connector includes a connector body and a plurality of pins, the connector body is provided with a guide recess, the plurality of pins are arranged in the guide recess, the connecting portion includes a guide boss located in the docking recess, the guide boss is provided with a plurality of pin holes, the guide boss is inserted into the guide recess, and the plurality of pins are respectively inserted into the plurality of pin holes.

7. The peripheral nerve stimulator according to claim 6, characterized in that: The peripheral nerve stimulator further includes a second seal that seals a gap between an inner surface of the guide recess and an outer surface of the guide boss.

8. The peripheral nerve stimulator according to claim 7, characterized in that: The control device further includes a pair of clamping plates, which are configured to releasably clamp the connector body, wherein in the plugging and unplugging direction, the pair of clamping plates are directly opposite to the second sealing member across the connector body.

9. The peripheral nerve stimulator according to claim 1, characterized in that: Each electrode lead is provided with a length compensation portion extending in a spiral shape.

10. The peripheral nerve stimulator according to claim 9, characterized in that: The electrode lead is equipped with at least one anchor configured to anchor the electrode lead to the patient's tissue, and the anchor closest to the control device is located on a side of the length compensation portion facing away from the control device.

11. The peripheral nerve stimulator according to claim 1, characterized in that: Each electrode lead sleeve is provided with at least one elastic member, wherein the elastic member comprises an elastic member body and two fixed ends, wherein the two fixed ends are respectively fixed to the electrode lead, so that when the elastic member is in a non-stretched state, a portion of the electrode lead located between the two fixed ends is bent.

12. The peripheral nerve stimulator according to claim 1, characterized in that: It also includes a twisting device, which includes a fixed shell, a rotating part and a torsion spring. The rotating part is partially accommodated by the fixed shell, the rotating part is provided with a through hole, the electrode lead passes through the through hole, the bottom of the rotating part is provided with a groove, the groove is provided with a connecting column extending downward, the torsion spring is sleeved on the connecting column, and the two ends of the torsion spring are respectively fixed to the fixed shell and the rotating part.

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