CN115999058A - Extension lead and nerve stimulation system - Google Patents

Abstract

The present disclosure provides an extension lead and neurostimulation system, the extension lead including a socket portion, extension and plug portion, the socket portion includes a plurality of guide cavities that are used for electrode male, is equipped with a plurality of socket contacts in every guide cavity, and the plug portion includes a plurality of plug contacts, and the plug portion is used for connecting the stimulator, and the extension includes a plurality of leads. Each socket contact is connected with one plug contact through the wire respectively, the plug contact is connected with at least one socket contact through the wire, one plug contact can be correspondingly connected with a plurality of socket contacts, the extension wire in the present disclosure is of a multi-cavity structure, a plurality of electrodes can be connected simultaneously, the application range of the stimulator can be expanded, compared with the scheme of the existing multi-cavity socket combination, the stability of the socket part of the extension wire is improved, and the frequency of operation replacement is reduced.

Description

Extension lead and nerve stimulation system

Technical Field

The invention relates to the technical field of medical equipment, in particular to an extension lead and a nerve stimulation system.

Background

As neurostimulation techniques develop, more and more symptoms have proven effective by electrically stimulating nerves or specific areas, such as DBS against parkinson's disease, essential tremor, etc., VNS against epilepsy, SNM against urinary related and painful SCS.

The extension lead is an important component of the nerve stimulation system and serves to connect the electrodes to the pulse generator and deliver the stimulation signal. The extension lead socket portion is connected with the electrode, and the conventional extension lead socket portion is usually in the form of a plurality of single-cavity sockets combined together, so that the stability is poor.

Disclosure of Invention

Object of the invention

The invention aims to provide an extension lead and nerve stimulation system, and a socket part adopts an integrated multi-cavity structure, so that the technical problem of poor stability after the combination of a plurality of existing single-cavity sockets is solved.

(II) technical scheme

The first aspect of the present invention provides an extension lead comprising:

a socket part including a plurality of guide cavities for electrode insertion;

an extension including a plurality of wires; and

a plug portion including a plurality of plug contacts;

the guide cavity is internally provided with a plurality of socket contacts, each socket contact is connected with one plug contact through a wire, and each plug contact is connected with at least one socket contact through a wire.

Further, in some embodiments of the present disclosure, the sealing member is located at the opening of the guide cavity and is integrally formed with the socket portion;

the sealing element is provided with connecting holes corresponding to the guide cavities.

Further, in some embodiments of the present disclosure, the sealing device further includes a plurality of sealing elements disposed in one-to-one correspondence with the guiding cavities, where the sealing elements are located at openings of the guiding cavities and are formed integrally with the socket;

the sealing element is provided with connecting holes, and each guide cavity is communicated with the corresponding connecting hole of the sealing element.

Further, in some embodiments of the present disclosure, the sealing member includes a winding portion connected with the socket portion, the winding portion being used to wind the fastening wire so that an inner wall of the connection hole is hermetically connected with the electrode inserted therein.

Further, in some embodiments of the present disclosure, the seal further includes a collar portion connected to the wire wrapping portion;

the winding part is positioned between the retainer ring part and the socket part, and the diameter of the winding part is smaller than the diameters of the retainer ring part and the socket part.

Further, in some embodiments of the present disclosure, the socket contacts in two adjacent guide cavities are arranged in a staggered manner.

Further, in some embodiments of the present disclosure, the socket portion is provided with a plastic member for bending and shaping, and the plastic member is disposed to extend along a length direction of the guide cavity.

Further, in some embodiments of the present disclosure, the socket part is provided with a plurality of plastic pieces corresponding to the guide cavities one by one;

the plastic part comprises a plastic part and a rigid part, the plastic part extends along the length direction of the guide cavity, and the plastic part is used for bending and shaping the socket part;

the plastic part is provided with a plurality of rigid parts at intervals corresponding to the parts of the guide cavity, and the rigid parts are arc-shaped and surround the corresponding circumference sides of the guide cavity.

Further, in some embodiments of the present disclosure, the extension further includes a protective tube for receiving the wire, the protective tube having a plurality of lumens, an inner wall of the lumens being provided with an electromagnetic shielding layer.

Another aspect of the present invention provides a neural stimulation system comprising the extension lead described above.

(III) beneficial effects

The technical scheme disclosed by the disclosure has the following beneficial technical effects:

the utility model provides an extension wire and nerve stimulation system, the socket portion of extension wire is the multicavity structure of an organic whole, the direction chamber is used for the insertion of electrode, for the structure of current many single chamber socket combinations, the overall stability of socket portion improves, the number of times of performing the operation because of socket portion disintegration damage has been reduced, be equipped with a plurality of socket contacts in the direction chamber, every socket contact passes through the wire and is connected with a plug contact, every plug contact passes through the wire and connects at least one socket contact, the extension wire in this disclosure can be connected many electrodes with the stimulator, the application scope of stimulator has been enlarged.

Drawings

Fig. 1 is a schematic structural diagram of an extension wire according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of the socket portion and the electrode according to the embodiment of the invention.

Fig. 3 is another schematic structural diagram of the socket portion and the electrode according to the embodiment of the present invention.

Fig. 4 is a schematic view of another structure of a socket according to an embodiment of the present invention.

Fig. 5 is a schematic view in partial perspective of a socket portion having four guide cavities provided in an embodiment of the present invention.

Fig. 6 is a schematic diagram of a positional relationship between a socket contact and a plastic member according to an embodiment of the present invention.

Fig. 7 is a schematic view in partial perspective of a socket portion provided in an embodiment of the present invention.

FIG. 8 isbase:Sub>A schematic cross-sectional view of A-A in FIG. 7, provided by an embodiment of the present invention.

Fig. 9 is a schematic view of a part of the structure of an extension portion according to an embodiment of the present invention.

Fig. 10 is a schematic cross-sectional view of an extension provided by an embodiment of the present invention.

Reference numerals:

1. a socket part; 11. a guide chamber; 12. a socket contact; 13. a plastic member; 131. a plastic part; 132. a rigid portion; 14. a first portion; 15-a second part;

2. an extension; 21. a protective tube; 22. an inner cavity; 23. an electromagnetic shielding layer; 3. a plug part; 31. a plug contact; 4. a seal; 41. a retainer ring portion; 42. a socket part; 43. a winding part; 5. an electrode.

Detailed Description

For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the drawings and specific language will be used to describe the same. It should be understood that the description is only exemplary and is not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure.

In the accompanying drawings, a schematic structural diagram according to an embodiment of the present invention is shown. The figures are not drawn to scale, wherein certain details may be omitted for the sake of clarity. The various shapes shown in the figures, as well as the relative sizes and positional relationships between them, are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and may be otherwise designed with different shapes, sizes and relative positions as desired by those skilled in the art.

It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.

In addition, technical features related to different embodiments of the present disclosure described below may be combined with each other as long as they do not make a conflict with each other. The present disclosure will be described in more detail below with reference to the accompanying drawings. Like elements are denoted by like reference numerals throughout the various figures. For clarity, the various features of the drawings are not drawn to scale.

The stimulator and the electrode are typically implantable in a human body, and the stimulator outputs a stimulation signal to a target site via the electrode for symptomatic relief and patient pain relief. The stimulator is connected with the electrode by an extension lead, one of the stimulator and the electrode is replaced by the extension lead which is detachably connected, and the other is not affected, so that the extension lead can reduce the replacement operation range and difficulty and relieve the pain of patients.

The socket part of the traditional extension lead is in a form of combining a single body or a plurality of split single-cavity seats, and the overall structure stability is poor. Therefore, the present disclosure provides an extension wire and nerve stimulation system, the socket portion of extension wire is the multicavity structure of an organic whole, and the direction chamber is equipped with a plurality ofly, and the direction intracavity is used for the insertion of electrode, is equipped with a plurality of socket contacts for the structure of current many single chamber socket combinations in every direction intracavity, and the overall stability of socket portion improves in this disclosure, has reduced the number of times of carrying out the operation because of socket portion disintegration damage, and extension wire can be connected many electrodes with the stimulator, has enlarged the application scope of stimulator.

The number of the present disclosure includes two.

Fig. 1 is a schematic structural diagram of an extension wire according to an embodiment of the present invention.

The embodiment of the invention provides an extension lead which is used for being implanted into a human body to connect an electrode and a stimulation 5 device, wherein the electrode can be a deep brain implantation electrode or a cerebral cortex electrode, the electrode is provided with a connecting end,

the connecting end is provided with a plurality of connecting contacts, and the stimulator is a pulse generator.

As shown in fig. 1, the extension wire mainly comprises a socket part 1, an extension part 2 and a plug part 3 which are connected in sequence, the socket part 1 comprises two guide cavities 11 for electrode insertion, four socket contacts 12 are arranged in each guide cavity 11, and the socket contacts 12 are used for contacting and conducting connection with the connection contacts of the electrodes.

The socket part 1 includes a first portion 14 and a second portion 15 made of an insulating polymer material. First one

The portion 14 may be of cylindrical configuration and the second portion 15 may be of conical configuration. The guide cavity 11 is arranged at the first part 14, the two guide cavities 11 are arranged at intervals in parallel, an opening is formed in one end, far away from the second part 15, of the guide cavity 11, of the first part 14, and the opening is communicated with the guide cavity 11. The second portion 15 has a decreasing cross-sectional radius in a direction away from the first portion 14.

The socket contacts 12 may be of annular configuration, with a portion of the socket contacts 12 being embedded in the guide cavity 11

The wall, the other part of which protrudes into the guide cavity 11, and the socket contacts 12 are made of a metallic conductive material, preferably copper. The plug part 3 is used for connecting a stimulator, the plug part 3 comprises eight plug contacts 31, the plug contacts 31 are made of metal conductive materials, the plug contacts 31 are of annular structures, and one part of the plug contacts 31

The other part is embedded into the plug part 3, and the other part forms a bulge on the surface of the plug part 3. The plug contacts 31 may be arranged at equal intervals of 0, with adjacent plug contacts 31 being spaced apart by a distance greater than the width of the plug contacts 31. The extension 2 comprises a plurality of wires, one end of which is connected to the socket contact 12 and the other end is connected to the plug contact 31.

One plug contact 31 is connected to each socket contact 12.

It should be noted that, in the present disclosure, only one plug contact 31 can be connected to one socket contact 12, so that the two plug contacts 31 are prevented from forming a short circuit through one socket contact 12.

5 in other embodiments, the number of plug contacts 31 may be less than the number of receptacle contacts 12,

if four socket contacts 12 are respectively arranged in the two guide cavities 11, only four plug contacts 31 are arranged, and one plug contact 31 is respectively connected with one socket contact 12 in the two guide cavities 11, so that two electrodes can be simultaneously communicated with all the plug contacts 31.

In other embodiments, the number of guide cavities 11 may be 3, 4 or more, forming a multi-path parallel between the socket part 1 and the plug part 3. The number of socket contacts 12 in the guide cavities 11 may be 2, 4, 8 or more, the number of socket contacts 12 in each guide cavity 11 may be the same or different, the socket contacts 12 in each guide cavity 11 may be disposed at equal intervals, and the interval distance between adjacent socket contacts 12 may be greater than the width of the socket contacts 12.

Fig. 1 shows a model 4*2, i.e. two guide cavities 11, in which 4 socket contacts are arranged in each guide cavity 11, and in practice, there may be more combinations, such as 4*3, 4*4, 8*2, 8*3, 8*4, etc.

Fig. 2 is a schematic view showing that the socket part provided in the embodiment of the present invention cooperates with the electrode 5, and the socket part in fig. 2 is different from the socket part in fig. 1 in that: in fig. 2, a seal member 4 is added to the socket portion corresponding to the guide chamber 11, and the seal member 4 is provided with communication holes corresponding to the plurality of guide chambers 11, respectively.

As shown in fig. 2, the sealing member 4 is provided at the opening of the guide chamber 11, and the sealing member 4 is integrally formed with the socket part 1. The sealing element 4 is internally provided with a connecting hole which is in butt joint communication with the guide cavity 11. In fig. 2, the number of the sealing elements 4 is one, and the number of the connecting holes in the sealing elements 4 is the same as that of the guiding cavities 11 and the connecting holes are arranged in a one-to-one correspondence manner.

The sealing member 4 may be made of a polymer material such as polyurethane, silicone rubber or other implant-grade materials. The sealing member 4 includes a socket portion 42, a retainer portion 41, and a winding portion 43 connected in this order, the winding portion 43 being connected to the socket portion 1, the winding portion 43 being configured to wind a tightening wire that seals and attaches the electrode 5 to the inner wall of the connection hole. The diameter of the socket portion 1 and the diameter of the retainer portion 41 are larger than the diameter of the winding portion 43, and an annular groove is formed between the retainer portion 41 and the socket portion 1, so that the movement range of the tightening wire can be restricted.

The sealing element 4 can be simultaneously and hermetically connected with a plurality of electrodes 5, the sealing element 4 has a sealing effect on the connection between the electrodes 5 and the socket part 1, so that body fluid can be prevented from entering the guide cavity 11, and the connection stability of the multichannel extension lead and the electrodes 5 is ensured.

Fig. 3 is another schematic structure of the socket portion and the electrode 5 according to the embodiment of the present invention, and fig. 3 is different from fig. 1 in that: the socket part 1 in fig. 3 is provided with one sealing member 4 corresponding to each guide cavity 11, a certain gap is provided between two adjacent sealing members 4, and each sealing member 4 is provided with a communication hole.

As shown in fig. 3, the seal member 4 is provided at the opening of the guide chamber 11 and is integrally formed with the socket part 1. The sealing elements 4 are arranged in one-to-one correspondence with the guide cavities 11, and the sealing elements 4 are internally provided with the guide cavities 11

And the connecting holes are in butt joint and communication. The seal 4 includes a socket portion 42, a retainer portion 41, and a wire winding connected in this order

And a portion 43, wherein the winding portion 43 is connected with the socket portion 1, and the winding portion 43 is used for winding a fastening wire, and the fastening wire enables the electrode 5 to be sealed and attached with the inner wall of the connecting hole.

The electrode 5 is inserted into the connecting hole of the sealing element 4 and then enters the guiding cavity 11, and the sealing element 4 faces the electrode 5

The connection with the socket part 1 has a sealing effect, prevents body fluid from entering the guide cavity 11, improves the safety, and prolongs the service life of the multichannel extension lead. Each sealing member 4 is independently arranged, when one of the electrodes 5

When the connection with the corresponding sealing member 4 is abnormal, the connection state 0 state of the other electrode 5 and the corresponding sealing member is not affected.

Fig. 4 is another schematic structure of a socket part according to an embodiment of the present disclosure, and fig. 4 is a schematic structure of the socket part and the fig. 4

1 is different in that: socket contact 12 of two adjacent guide cavities 11 of socket part 1 in fig. 4

And (5) dislocation is arranged.

As shown in fig. 4, the socket part 1 has two guide cavities 11 arranged in parallel, four socket contacts 12 are provided in each guide cavity 115, and two guide cavities can be considered as longitudinal direction of the guide cavity 11

The socket contacts 12 in the cavity 11 are staggered in the lateral direction. In other embodiments, the receptacle contacts 12

When 2, 6, 8 and more are provided, the socket contacts 12 in the adjacent two guide cavities 11 are still staggered. This arrangement contributes on the one hand to a reduction in the diameter of the socket part 1 and thus the socket part 1

Reducing the risk of surgical implantation. On the other hand, the mutual interference of the 0 socket contacts 12 in the adjacent guide cavities 11 is avoided, the processing difficulty is reduced, and the use safety is improved.

Figure 5 is a schematic partial perspective view of a socket portion having four guide cavities provided in accordance with an embodiment of the present disclosure,

in fig. 5, the socket part 1 is provided with socket contacts 12 and plastic parts 13 corresponding to each guide cavity 11, wherein the socket contacts 12 are arranged in an arc-shaped manner in the circumferential direction of the guide cavity 11, and the corresponding central angles are smaller than equal

At 180 deg.. Fig. 6 is a schematic diagram showing the positional relationship between the socket contact and the plastic member according to the embodiment of the present invention, 5 the plastic member 13 includes a plastic portion 131 and a rigid portion 132, the plastic portion 131 extending along the length direction of the guide cavity

The plurality of rigid portions 132 are arranged at intervals in the extending direction of the plastic portion 131, and a socket contact 12 is provided between two adjacent rigid portions 132.

The socket part 1 is processed by polymer plastic, has certain toughness and can be bent. The plastic member 13 is provided in the socket part 1, and the plastic member 13 extends from one side to the other side of the socket part 1 along the length direction of the guide chamber 11. The plastic member 13 is bendable along with the socket part 1, and is shaped after bending the socket part 1. Taking deep brain electrode 5 and cortex electrode 5 as an example, the socket part 1 of the extension lead needs to be fixed on the skull, the surface of the skull is a curved surface, the curved socket part 1 can be more attached to the skull, the fixing difficulty of the socket part 1 is reduced, and the stability of the extension lead is improved.

According to the state of the socket part 1 after bending, one side, which is attached to the skull, of the socket part 1 is defined as a bending inner side, the other opposite side is defined as a bending outer side, the socket part 1 is in a columnar structure, the bending inner side of the socket part 1 is a plane or an inward concave cambered surface, and the other sides are curved surfaces.

As shown in fig. 5-6, the first portion 14 of the socket part 1 is provided with four rectangular guide cavities 11, and the socket part 1 is further provided with a plastic member 13 and a socket contact 12 corresponding to each guide cavity 11, the plastic member 13 and the socket contact 12 being located on the side of the guide cavity 11 facing the outside of the bend. The plastic member 13 includes a plastic portion 131 and a rigid portion 132, wherein a plurality of rigid portions 132 are disposed at positions of the plastic portion 131 corresponding to the guide cavity 11 at intervals, the plastic portion 131 and the rigid portions 132 can be connected by fusion welding, and a socket contact 12 is disposed between two adjacent rigid portions 132.

The plastic part 131 is deformed by a certain external force, and cannot be restored to its original shape after the external force is removed. Therefore, the plastic part 131 may be a wire having a certain diameter (the diameter of the wire may be selected by those skilled in the art according to the size of the socket part 1), and the material of the plastic part 131 is preferably an aluminum alloy or a copper alloy. When the socket part 1 is bent, the plastic part 131 inside the socket part follows the bending, and the plastic part 131 is used for keeping the socket part 1 in a bent state, so that the socket part 1 is conveniently fixed on the skull. The rigid portion 132 is made of a metal material that is not flexible, such as a titanium alloy. The rigid portion 132 is disposed in an arc shape around the guide cavity 11, preferably, the rigid portion 132 is a semicircular arc wire, and when the socket portion 1 is bent, the rigid portion 132 plays a certain supporting role, so that deformation of the guide cavity 11 can be reduced, and stability of the socket contact 12 can be improved.

Fig. 7 is a schematic diagram of a partial perspective view of a socket portion provided by an embodiment of the present invention. Fig. 8 isbase:Sub>A schematic cross-sectional view ofbase:Sub>A portionbase:Sub>A-base:Sub>A in fig. 7, in which the cross-sectional shape of the socket contact 12 in the axial direction isbase:Sub>A trapezoid, andbase:Sub>A long side of the trapezoid is located in the guide cavity, andbase:Sub>A short side of the trapezoid is located in the socket portion.

Fig. 7 and 8 illustrate one guide chamber 11. As shown in fig. 7, the socket contact 12 and the plastic member 13 are located at one side of the guiding cavity 11 facing the outside of the bend, the rigid portions 132 and the socket contact 12 are staggered in the length direction of the guiding cavity 11, one socket contact 12 is provided between the two rigid portions 132, and the socket contact 12 is arranged in an arc shape around the guiding cavity 11 in the circumferential direction. As shown in fig. 8, the receptacle contact 12 has a trapezoidal cross-sectional shape in the axial direction of the guide chamber 11, the long side of the trapezoid being located in the guide chamber 11, and the short side of the trapezoid being located in the receptacle portion 1. When the socket part 1 is bent, the side wall of the guide cavity 11 provided with the socket contact 12 is in a compressed state, the socket contact 12 is pressed, and according to the decomposition of force, the socket contact 12 is subjected to the force towards the inside of the guide cavity 11, and in this state, the contact between the socket contact 12 and the electrode 5 can be ensured to be more stable.

Fig. 9 is a schematic view of a portion of a structure of an extension portion according to an embodiment of the present disclosure, where the extension portion in fig. 9 is different from the extension portion in fig. 1 in that: the extension part is changed from a linear type to a spiral type.

As shown in fig. 9, the extension part 2 has a spiral structure, and the extension part 2 can be stretched for a certain length after being implanted into the body, so as to avoid the extension part 2 from being broken due to the movement of the human body, taking the stretching and contraction of muscles during the movement of the human body into consideration.

Fig. 10 is a schematic cross-sectional view of an extension provided by an embodiment of the present disclosure.

The extension 2 comprises a protective tube 21, the inner cavity 22 of which protective tube 21 is adapted to receive a wire, and the protective tube 21 may be a spiral hose as shown in fig. 9.

The protection tube 21 is made of a flexible polymer material such as polyurethane or silicone rubber. The protection tube 21 comprises a plurality of inner cavities 22, the number of the inner cavities 22 is the same as that of the plug contacts 31, wires connected with the same plug contact 31 are positioned in one inner cavity 22, the influence among different plug contacts 31 is reduced, an electromagnetic shielding layer 23 is arranged on the inner wall of the inner cavity 22, and the magnetic compatibility of the wires is further improved by the electromagnetic shielding layer 23.

The embodiment of the disclosure also provides a stimulation system, which comprises a stimulator, an electrode and the extension lead, wherein the socket part 1 of the extension lead is detachably connected with the electrode, and the plug part 3 of the extension lead is detachably connected with the stimulator.

The present disclosure has been described above with reference to embodiments thereof. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. The scope of the disclosure is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be made by those skilled in the art without departing from the scope of the disclosure, and such alternatives and modifications are intended to fall within the scope of the disclosure.

Claims (10)

1. An extension lead, comprising:

a socket part (1), wherein the socket part (1) comprises a plurality of guide cavities (11) for inserting the electrodes (5);

an extension (2), the extension (2) comprising a plurality of wires; and

a plug portion (3), the plug portion (3) comprising a plurality of plug contacts (31);

wherein a plurality of socket contacts (12) are arranged in the guide cavity (11), each socket contact (12) is connected with one plug contact (31) through a wire, and each plug contact (31) is connected with at least one socket contact (12) through the wire.

2. The extension wire according to claim 1, further comprising a sealing member (4), the sealing member (4) being located at an opening of the guide cavity (11) and being integrally formed with the socket part (1);

the sealing element (4) is provided with connecting holes corresponding to the guide cavities (11) respectively.

3. The extension lead according to claim 1, further comprising a plurality of sealing members (4) disposed in one-to-one correspondence with the guide cavities (11), the sealing members (4) being located at openings of the guide cavities (11) and being integrally formed with the socket;

the sealing element (4) is provided with a connecting hole, and each guide cavity (11) is communicated with the corresponding connecting hole of the sealing element (4).

4. An extension lead according to claim 2 or 3, wherein the sealing member (4) comprises a winding portion (43), the winding portion (43) being connected to the socket portion (1), the winding portion (43) being for winding a fastening wire so that an inner wall of the connection hole is hermetically connected to the electrode (5) inserted therein.

5. The extension wire according to claim 4, wherein the seal (4) further comprises a collar portion (41) connected to the winding portion (43);

the winding part (41) is positioned between the retainer ring part (43) and the socket part (1), and the diameter of the winding part (1) is smaller than the diameter of the retainer ring part (43) and the diameter of the socket part (1).

6. The extension wire according to claim 1, characterized in that the socket contacts (12) in adjacent two of the guide cavities (11) are arranged offset.

7. The extension wire according to claim 1, wherein the socket part (1) is provided with a plastic member (13) for bending shaping, the plastic member (13) extending along the length of the guide lumen (11).

8. The extension wire according to claim 7, wherein the socket part (1) is provided with a plurality of plastic pieces (13) in one-to-one correspondence with the guide cavities (11);

the plastic part (13) comprises a plastic part (131) and a rigid part (132), the plastic part (131) extends along the length direction of the guide cavity (11), and the plastic part (131) is used for bending and shaping the socket part (1);

the plastic part (131) is provided with a plurality of rigid parts (132) at intervals corresponding to the parts of the guide cavities (11), and the rigid parts (132) are in arc shapes and surround the corresponding circumference sides of the guide cavities (11).

9. The extension wire according to claim 1, wherein the extension (2) further comprises a protective tube (21) for accommodating the wire, the protective tube (21) having a plurality of inner cavities (22), the inner walls of the inner cavities (22) being provided with electromagnetic shielding layers (23).

10. A nerve stimulation system comprising the extension lead of any one of claims 1-9.

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