Puncture suite and electrode for electrical stimulation of dorsal root ganglion

Abstract

The puncture suite comprises a sheath tube and an expansion tube, and the sheath tube comprises a first connector and a sheath tube body connected with the first connector; the expansion tube comprises a second joint and an expansion tube body connected with the second joint; the expansion tube can be sleeved with the sheath tube, and the first connector and the second connector are detachably connected. The expansion tube far end of the expansion tube body is provided with an approximately conical transition section, the joint of the transition section and the expansion tube body is a step with a height difference, the transition section is provided with at least two openings in the axial direction, and under the condition that the transition section of the expansion tube body is moved out of the sheath tube far end of the sheath tube, the transition section expands towards the periphery along the openings so as to expand the vertebral foramen. According to the expansion tube, the vertebral foramen of the spine can be effectively expanded when needed, a larger electrode is allowed to be implanted, and meanwhile stress can be rapidly released through the improved electrode structure.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a puncture kit for electrical stimulation of dorsal root ganglia. Background Art

[0002] Dorsal root ganglion stimulation (DRGS) is a surgical technique for treating neuropathic pain. Numerous clinical studies have validated its effectiveness. DRGS involves puncturing the interlaminar space, passing through the spinal canal and dorsal to the dura mater to access the intervertebral foramen. The technique received US FDA approval in 2016 and entered clinical use.

[0003] Several unique anatomical features of the root ganglia make them a favorable target for electrical stimulation. By passing electrodes through the neural foramina, DRG stimulation may block the conduction of action potential signals from pain fibers in primary sensory units, thereby alleviating pain. The DRG's location relative to the vertebral foramen creates a natural accommodation for the stimulator leads and avoids some of the migration and positioning issues that can occur in the epidural space. While DRG stimulation offers more precise and effective treatment areas than traditional spinal cord stimulation, it is limited by its location and can only be fixed in one place. This makes adjustment and placement more challenging. After identifying the DRG stimulation target (target tissue), healthcare professionals can use a puncture kit with the assistance of a visualization device to implant the electrode unit into or adjacent to the target tissue. The electrode unit can be inserted into the intervertebral foramen via a lateral puncture of the spine.

[0004] Patent document CN116036477A discloses a spinal nerve root electrical stimulation system, comprising: an external control subsystem, a multi-module electrical stimulation subsystem, connecting wires, and flexible stimulation electrodes; the external control subsystem is used to send control signals to the multi-module electrical stimulation subsystem; the multi-module electrical stimulation subsystem is used to transmit stimulation signals corresponding to the control signals to flexible stimulation electrodes disposed at target locations within a target organism via connecting wires; the flexible stimulation electrodes are used to output stimulation signals to electrically stimulate the spinal nerve roots at the target locations, wherein the flexible stimulation electrodes are made of flexible materials. This invention places the flexible stimulation electrodes at the level of the spinal nerve roots to precisely electrically stimulate the spinal nerve roots of the target organism.

[0005] For another example, the patent document with application publication number CN105477779A discloses an electrical stimulator for dorsal root ganglia, which is used to electrically stimulate at least one dorsal root ganglion to reduce pain without causing abnormal sensation. The electrical stimulator includes: at least one electrical stimulation unit, including at least one first electrode and at least one second electrode. The electrical stimulation unit emits a high-frequency electrical stimulation signal to generate an electric field between the first electrode and the second electrode. The electric field range covers the dorsal root ganglion, and the electric field strength ranges from 100V / m to 1000V / m.

[0006] There are several technical challenges in the process of implanting the electrodes for dorsal root ganglion electrical stimulation into the body through a puncture kit. The drawbacks of the puncture kit include: first, for patients with lumbar spinal stenosis, the vertebral foramen is difficult to enlarge and the electrodes are difficult to pass through; second, the stress of the barbs on the electrodes cannot be quickly released. Therefore, how to improve the puncture kit and its electrodes for dorsal root ganglion electrical stimulation is a challenge facing current technology. Specifically, it is necessary to quickly release the stress of the barbs on the electrodes after implantation, while ensuring that the kit can assist larger electrodes in passing through narrow vertebral foramina.

[0007] The present invention aims to improve the structure of the puncture kit and electrodes for dorsal root ganglion electrical stimulation to solve the above problems.

[0008] In addition, on the one hand, due to differences in understanding among those skilled in the art; on the other hand, because the applicant studied a large number of documents and patents when making this utility model, but due to space limitations, not all details and contents are listed in detail. However, this does not mean that the utility model does not have the characteristics of these prior arts. On the contrary, the utility model already has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology. Utility Model Content

[0009] During the process of implanting the electrodes for dorsal root ganglion electrical stimulation into the body through a puncture kit, the defects of the puncture kit include: (1) For patients with lumbar spinal stenosis, the vertebral foramen is difficult to expand and the electrode is difficult to pass through. The traditional expansion tube is a hollow tube with a tapered end, and the vertebral foramen can only be expanded by replacing the expansion tube with a larger diameter. Replacing the expansion tube prolongs the operation time and brings obvious inconvenience. (2) The stress of the barbs on the electrode cannot be released quickly. When the electrode is moved to the specified position, due to the slow release process of the electrode stress, its change may cause the electrode to be easily displaced. Therefore, how to improve the puncture kit for dorsal root ganglion electrical stimulation and its electrodes so that the stress of the barbs of the electrode can be quickly released after the electrode is implanted, and at the same time the kit can assist the larger electrode to pass through the narrow vertebral foramen, is a problem currently encountered during surgery and a technical problem that has not been solved by current medical products.

[0010] To address the shortcomings of the prior art, the present invention provides, from a first aspect, a puncture kit for dorsal root ganglion electrical stimulation, comprising a sheath and a dilator. The sheath comprises a first connector and a sheath body connected thereto; the dilator comprises a second connector and a dilator body connected thereto; the dilator is capable of being inserted within the sheath, with the first connector and the second connector being detachably connected; the dilator body is provided with a substantially conical gradient section at the distal end of the dilator body, the gradient section connecting to the dilator body being a stepped step with a height difference, and the gradient section having at least two openings axially disposed. When the gradient section of the dilator body is removed from the distal end of the sheath, the gradient section expands in all directions along the openings to enlarge the vertebral foramen. By improving the structure of the dilator, the gradient section of the dilator body is capable of expanding and widening the vertebral foramen, thereby allowing a larger electrode to pass through the vertebral foramen and improving surgical efficiency.

[0011] According to a preferred embodiment, the expansion tube body is further provided with a limit ring. The limit ring is positioned outside the expansion tube body, with one end positioned at the step location. The thickness of the limit ring is equal to the height difference of the step. The step and limit ring allow the limit ring to constrain the transition section, allowing it to pass through a narrow vertebral foramen. After the transition section passes through the foramen, the movement of the limit ring causes the transition section to rapidly expand, thereby widening the foramen.

[0012] According to a preferred embodiment, a bend memory position is present within the axial length of the retaining ring in contact with the expansion tube body. The opening extends from the distal end of the gradient section to the bend memory position. When the retaining ring is removed from the step and the bend memory position is exposed, the expansion tube body bends and expands in all directions based on the opening at the bend memory position. The provision of the bend memory position enables the expansion tube body to expand the vertebral foramen with rapid stress release. Without the bend memory position, the expansion tube body slowly expands the vertebral foramen, resulting in slow stress release, making it impossible to quickly pass a large electrode through the vertebral foramen, or requiring the electrode to pass through the vertebral foramen slowly.

[0013] According to a preferred embodiment, a retaining ring is connected to a first guidewire. The first guidewire pushes the retaining ring to propel the transitional section through the vertebral foramen. When the transitional section passes through the foramen and the foramen requires expansion, the retaining ring, pulled by the first guidewire, moves away from the step, causing the transitional section to bend and expand. The movement of the retaining ring allows the transitional section to be pushed through the foramen and can also move in the opposite direction, thereby expanding the transitional section. Compared to the prior art expansion tubes that cannot be split and expanded, the expansion tube of the present invention can allow larger electrodes to pass through the foramen.

[0014] According to a preferred embodiment, the device further comprises an electrode, comprising an electrode carrier, an electrode sheet disposed on the electrode segment of the electrode carrier, barbs disposed on the barb segment of the electrode carrier, and a memory strain ring disposed between the barbs and the electrode carrier. When the electrode is removed from the expansion tube body, the pressure on the memory strain ring dissipates and the ring returns to its original annular memory shape, pushing the barbs to expand and relieve stress. This configuration has the advantage that the memory strain ring can quickly push the barbs to expand, allowing the stress of the barbs to be quickly released, thus avoiding electrode displacement caused by slow stress release.

[0015] According to a preferred embodiment, the barbs include main barbs and microbarbs, with the microbarbs disposed outside the main barbs. The main barbs are arc-shaped, and the tail ends of the main barbs curl inward. The inward curling of the tail ends allows the barbs to be relatively fixed to the muscle tissue while also preventing the tail ends from excessively penetrating the muscle tissue.

[0016] According to a preferred embodiment, the diameter of the curled tail end of the main barb is smaller than the diameter of the memory strain ring in its memory state. When the main barb is compressed and the tail end contacts the electrode carrier, the memory strain ring is deformed. With this arrangement, when the barb is closed, the memory strain ring is significantly compressed and deformed. Furthermore, the curled tail end provides support, preventing the memory strain ring from being overly compressed and unable to return to its original memory shape.

[0017] According to a preferred embodiment, when the electrodes are positioned within the expansion tube body, the memory strain ring is positioned axially between the bent memory position and the step, allowing the memory strain ring to indirectly apply force to the expansion tube body via the main barbs. This arrangement applies an outward force to the expansion tube body. When the expansion tube body needs to expand outward based on the memory deformation, the force exerted by the memory strain ring facilitates and rapidly expands the expansion portion of the expansion tube body, thereby widening the vertebral foramen.

[0018] According to a second aspect, the present invention provides an electrode for electrical stimulation of dorsal root ganglia. The electrode comprises an electrode carrier, an electrode sheet disposed on an electrode segment of the electrode carrier, barbs disposed on the barb segment of the electrode carrier, and a memory strain ring disposed between the barbs and the electrode carrier. When the electrode is removed from the dilator body, the pressure exerted on the memory strain ring disappears and the original annular memory shape is restored, pushing the barbs to expand and eliminate stress. The electrode provided by the present invention, by improving the barb structure and the memory strain ring structure, allows for rapid stress release of the barbs, making the barbs less likely to shift, thereby facilitating stable electrode implantation.

[0019] According to a preferred embodiment, within the axial length range of the contact between the limit ring and the expansion tube body, there is a bending memory position in the expansion tube body, and the opening extends from the distal end of the gradient section to the bending memory position. When the electrode is arranged in the expansion tube body, in the axial direction, the position of the memory strain ring is between the bending memory position and the step, and the memory strain ring indirectly applies force to the expansion tube body through the main barb.

[0020] By arranging the electrodes at appropriate positions, the memory strain ring can not only assist in quickly releasing the stress of the barbs, but also quickly release the stress of the expansion portion of the expansion tube body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the dorsal root ganglion electrical stimulation puncture kit provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the expansion tube structure of the puncture kit for dorsal root ganglion electrical stimulation provided by the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the expansion tube provided by the present invention in a closed state at the distal end;

[0024] Figure 4 This is a cross-sectional view of the closed state of the distal end of the expansion tube provided by the utility model;

[0025] Figure 5 This is a structural schematic diagram of one angle of the distal end of the expansion tube provided by the present invention in the expanded state;

[0026] Figure 6 This is a structural schematic diagram of the distal end of the expansion tube provided by the present invention in an expanded state from another angle;

[0027] Figure 7 This is a cross-sectional view of a puncture kit for electrical stimulation of dorsal root ganglia including electrodes provided by the present invention;

[0028] Figure 8 It is a structural schematic diagram of the electrode barb provided by the utility model in an expanded state.

[0029] Reference Signs List

[0030] 100: sheath; 110: proximal end of sheath; 120: distal end of sheath; 130: first connector; 140: sheath body; 200: expansion tube; 210: proximal end of expansion tube; 220: distal end of expansion tube; 230: second connector; 240: expansion tube body; 250: limiting ring; 251: step; 252: gradient section; 253: opening; 254: first guide wire; 255: bending memory position; 256: inflection point position; 300: electrode; 310: electrode sheet; 320: electrode carrier; 321: electrode segment; 322: barb segment; 330: barb; 331: main barb; 332: tail end; 333: memory strain ring; 334: micro barb; 335: second guide wire. DETAILED DESCRIPTION

[0031] The following is a detailed description with reference to the accompanying drawings.

[0032] A vertebral foramen is a passage or opening in the spine, formed by the depressions between adjacent vertebrae. Behind the vertebral body of each vertebra lies a circular bony structure called the vertebral arch, with the central depression forming the vertebral foramen. When multiple vertebrae are connected and stacked together by intervertebral discs and facet joints, their foramina become continuous, forming a long, cylindrical spinal canal.

[0033] Example 1

[0034] During the implantation of a dorsal root ganglion electrical stimulation device, the electrodes are inserted into the body through a puncture kit and passed through the vertebral foramen. However, these puncture kits have several drawbacks. First, for patients with lumbar spinal stenosis, widening the foramen and allowing the electrodes to pass smoothly is a challenge. Traditional dilators are hollow tubes with tapered ends. Dilation of the foramen can only be achieved by replacing them with dilators with larger diameters, which increases surgical time and creates inconvenience. Second, the barbs on the electrodes release stress slowly. When the electrodes are positioned at the predetermined location, their stress slowly releases, and this stress change can cause the electrodes to shift. Therefore, there is an urgent need to improve the dorsal root ganglion electrical stimulation puncture kit and its electrode design. This can quickly release the stress of the barbs on the electrodes after implantation and enable the puncture kit to facilitate the passage of thicker electrodes through narrow vertebral foramina. This is a critical issue faced during surgery and a technical challenge that has yet to be addressed by current medical products.

[0035] In view of the shortcomings of the existing technology, the present invention provides a puncture kit for electrical stimulation of dorsal root ganglion, comprising a sheath tube 100 and an expansion tube 200. Figure 1 As shown, the sheath tube 100 includes a first connector 130 and a sheath tube body 140 connected thereto. Figure 1As shown, the proximal end of the first connector 130 is a standard external Luer thread, and its distal end is mechanically connected to the proximal end 110 of the sheath body 140. The sheath body 140 is a hollow tube, and the distal end 120 of the sheath body 140 is semicircular or naturally curved. A protruding marking wing is provided on the first connector 130. The marking wing is coplanar with the semicircular or naturally curved shape and is used to indicate the direction of the semicircular shape, facilitating precise control of the sheath 100 by medical personnel during surgery.

[0036] like Figure 2 As shown, the expansion tube 200 includes a second connector 230 and an expansion tube body 240 connected thereto. The expansion tube 200 can be sleeved inside the sheath tube 100, and the first connector 130 and the second connector 230 are connected in a detachable manner. Specifically, the proximal end of the second connector 230 is a standard external Luer thread. The distal end of the second connector 230 is adhesively connected to the expansion tube proximal end 210 of the expansion tube body 240. The interior of the second connector 230 is also provided with an internal Luer thread for spiral connection with the first connector 130. Marking wings are also provided on both sides of the second connector 230. The plane where the marking wings are located is in the same plane as the plane formed by the curved shape, which is used to indicate the direction of the distal end of the expansion tube body 240, so as to facilitate the medical staff to accurately control the expansion tube 200 during surgery.

[0037] The expansion tube body 240 is a hollow tube. The distal end of the expansion tube distal end 220 is bent 30 to 45 degrees at the inflection point 256. Compared with the bending memory position 255, the inflection point 256 is closer to the second joint 230. Figure 2 、 Figure 3 and Figure 4 As shown, the distal end 220 of the expansion tube is provided with a tapered gradient section 252. The connection between the gradient section 252 and the expansion tube body 240 is a step 251 with a height difference. The height difference is less than half the thickness of the expansion tube body 240, that is, less than half the thickness of the expansion tube body 240.

[0038] The radius of the gradient section 252 gradually decreases from the position of the step 251 to the end of the expansion tube distal end 220. The gradient section 252 facilitates the expansion tube body 240 to pass through tissue structures such as the vertebral foramen.

[0039] The expansion tube body 240 is made of a flexible material that is harmless to human tissue. A memory alloy framework is embedded within the curved section of the expansion tube body 240. The memory alloy extends from the inflection point 256 to the distal end 220 of the expansion tube. This arrangement does not affect the full advancement of the expansion tube body 240 within the body, and the memory alloy can be used to rapidly enlarge the vertebral foramen when necessary.

[0040] like Figure 3 and Figure 4As shown, the gradient section 252 is provided with at least two openings 253 along the axial direction. The openings 253 can also be regarded as cracks. Figure 4 As shown, there is a bending memory position 255 within the axial length range where the limiting ring 250 contacts the expansion tube body 240. The opening 253 extends from the distal end of the gradient section 252 to the bending memory position 255. Figure 5 and Figure 6 As shown, at the bend memory position 255, the multiple arc-shaped segments of the gradient section 252, defined by the opening 253, bend outward. The bending angle here is 30 to 50 degrees. The bending angle of the bend memory position 255 is preset to the memory deformation state of the memory alloy. When the memory alloy is compressed, it deforms accordingly. When the pressure on the memory alloy is released, the memory alloy returns to the memory deformation state.

[0041] like Figures 3 to 6 As shown, the expansion tube body 240 is also provided with a limiting ring 250. The limiting ring 250 is sleeved on the outside of the expansion tube body 240, and one end of the limiting ring 250 is positioned at the position of the step 251. The thickness of the limiting ring 250 is equal to the height difference of the step 251. Preferably, the height difference is 1 to 5 mm. More preferably, the height difference is 3 mm. Correspondingly, the thickness of the limiting ring 250 is also 3 mm. This arrangement eliminates the height difference between the limiting ring 250 and the gradient section 252, facilitating smooth movement of the expansion tube body 240 within the sheath body 140. Preferably, the limiting ring 250 and the expansion tube body 240 can rotate relative to each other, so that the direction of the expansion tube distal end 220 of the expansion tube body 240 can be adjusted. By providing the step 251 and the limiting ring 250, the gradient section 252 is constrained so that it can pass through the narrow vertebral foramen. After the gradual section 252 passes through the vertebral foramen, the movement of the limiting ring 250 causes the gradual section 252 to open rapidly, thereby expanding the vertebral foramen.

[0042] like Figures 3 to 6 As shown, the retaining ring 250 is connected to the first guidewire 254. Medical personnel can pull and push the first guidewire 254. The first guidewire 254 pushes the retaining ring 250 to move, which in turn pushes the transition section 252 to move, thereby indirectly pushing the transition section 252 through the vertebral foramen. When the transition section 252 passes through the vertebral foramen and the foramen needs to be expanded, the retaining ring 250, pulled by the first guidewire 254, moves away from the step 251, causing the transition section 252 to lose pressure, bending and expanding in all directions. At this time, if the vertebral foramen is close to the implantation location of the electrode 300, the expansion tube body 240 can remain at the vertebral foramen, maintaining its expanded state. The movement of the retaining ring 250 allows the transition section 252 to be pushed through the vertebral foramen, and also allows it to move in the opposite direction, thereby expanding the transition section 252. Compared with the prior art, the expansion tube 200 of the present invention can allow a larger electrode 300 to pass through the vertebral foramen, thereby improving surgical efficiency.

[0043] like Figure 5 and Figure 6 As shown, when the gradient section 252 of the expansion tube body 240 is removed from the sheath distal end 120 of the sheath 100 , the gradient section 252 expands toward the periphery along the opening 253 to enlarge the vertebral foramen.

[0044] When the gradient section 252 of the expansion tube body 240 is removed from the sheath distal end 120 of the sheath 100 , the gradient section 252 expands in all directions along the opening 253 to enlarge the vertebral foramen.

[0045] Specifically, if Figure 5 and Figure 6 As shown, when the retaining ring 250 is away from the step 251 and the bend memory position 255 is exposed, the pressure exerted by the retaining ring 250 on the bend section of the expansion tube body 240 disappears, and the expansion tube body 240 begins to bend and expand in all directions from the bend memory position 255 based on the opening 253. By providing the bend memory position 255, the expansion tube body 240 can expand the vertebral foramen in a manner that quickly releases stress. Without the bend memory position 255, the expansion tube body 240 expands the vertebral foramen at a slow rate, which slows down the stress release and prevents the large electrode 300 from quickly passing through the vertebral foramen, or the electrode 300 needs to pass through the vertebral foramen slowly. Preferably, medical personnel can control the movement speed of the retaining ring 250 by pulling or pushing the first guide wire 254, thereby controlling the expansion speed of the gradual section 252 of the expansion tube body 240.

[0046] Example 2

[0047] This embodiment is a further improvement of embodiment 1, and repeated contents will not be repeated here.

[0048] like Figure 7 As shown, the puncture kit also includes an electrode 300. Electrode 300 includes an electrode carrier 320. An electrode sheet 310 is disposed on an electrode segment 321 of electrode carrier 320. Barbs 330 are disposed on a barb segment 322 of electrode carrier 320. Barbs 330 are made of a memory alloy. A memory strain ring 333 is disposed between barbs 330 and electrode carrier 320. The memory shape of memory strain ring 333 is configured to be approximately circular, approximately circular, or elliptical. In this case, in the memory shape, the diameter of memory strain ring 333 is larger than the diameter of the curled structure of tail end 332.

[0049] like Figure 8As shown, when the electrode 300 is removed from the expansion tube body 240, the pressure on the memory strain ring 333 disappears and the memory ring 333 returns to its original annular shape, pushing the barbs 330 to expand and relieve stress. This configuration has the advantage that the memory strain ring 333 can quickly push the barbs 330 to expand, quickly releasing the stress on the barbs 330 and preventing displacement of the electrode 300 due to slow stress release.

[0050] like Figure 7 and Figure 8 As shown, the barbs 330 include main barbs 331 and micro barbs 334. Several micro barbs 334 are arranged on the outside of the main barbs 331 to prevent the main barbs 331 from moving relative to the muscle tissue, that is, to fix the position of the main barbs 331 and the muscle tissue. Figure 8 As shown, the main barb 331 is arc-shaped, and the tail end 332 of the main barb 331 is curled inward. The tail end 332 is set to be curled inward, which can not only fix the barb 330 relative to the muscle tissue, but also prevent the tail end 332 from excessively penetrating the muscle tissue. Figure 7 As shown, the tail end 332 of the main barb 331 can be curled inward for multiple turns.

[0051] like Figure 7 and Figure 8 As shown, the diameter of the curled tail end 332 of the main barb 331 is smaller than the diameter of the memory strain ring 333 in its memory state. When the main barb 331 is compressed and the tail end 332 contacts the electrode carrier 320, the memory strain ring 333 is flattened and deformed. With this arrangement, when the barb 330 is closed, the memory strain ring 333 is significantly compressed and deformed. At the same time, the curled shape of the tail end 332 can also provide support to prevent the memory strain ring 333 from being overly compressed and prevent the memory strain ring 333 from being unable to restore its memory shape.

[0052] like Figure 4 As shown, when the electrode 300 is disposed within the expansion tube body 240, the memory strain ring 333 is axially positioned between the bend memory position 255 and the step 251, allowing the memory strain ring 333 to indirectly apply force to the expansion tube body 240 via the main barbs 331. This configuration exerts an outward force on the expansion tube body 240. When the expansion tube body 240 needs to expand outward based on the memory deformation, the force exerted by the memory strain ring 333 helps the expansion tube body 240 to quickly open, thereby enlarging the vertebral foramen.

[0053] Preferably, if Figure 7 As shown, a second guide wire 335 is provided at the proximal end of the electrode carrier 320 of the electrode 300. Medical personnel can adjust the position of the electrode 300 by moving the second guide wire 335.

[0054] It should be noted that the above-mentioned specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of this utility model, and these solutions also belong to the disclosure scope of this utility model and fall within the protection scope of this utility model. Those skilled in the art should understand that the specification of this utility model and its drawings are illustrative and do not constitute a limitation on the claims. The scope of protection of this utility model is defined by the claims and their equivalents. This utility model specification contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", which means that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application based on each inventive concept.

Claims

1. A puncture kit for electrical stimulation of dorsal root ganglion, comprising a sheath (100) and a dilation tube (200), The sheath tube (100) comprises a first connector (130) and a sheath tube body (140) connected thereto; The expansion tube (200) includes a second joint (230) and an expansion tube body (240) connected thereto; The expansion tube (200) can be sleeved inside the sheath tube (100), and the first connector (130) and the second connector (230) are connected in a detachable manner; It is characterized in that The expansion tube distal end (220) of the expansion tube body (240) is provided with a tapered gradual section (252), and the connection between the gradual section (252) and the expansion tube body (240) is a step (251) with a height difference. The gradient section (252) is provided with at least two openings (253) along the axial direction. When the gradient section (252) of the expansion tube body (240) is removed from the sheath distal end (120) of the sheath (100), the gradient section (252) expands in all directions along the opening (253) to enlarge the vertebral foramen.

2. The dorsal root ganglion electrical stimulation puncture kit according to claim 1, characterized in that: The expansion tube body (240) is further provided with a limiting ring (250). The limiting ring (250) is sleeved on the outside of the expansion tube body (240) and one end thereof is arranged at the position of the step (251). The thickness of the limiting ring (250) is equal to the height difference of the step (251).

3. The dorsal root ganglion electrical stimulation puncture kit according to claim 2, characterized in that: A bending memory position (255) exists within the axial length range where the limiting ring (250) contacts the expansion tube body (240), and the opening (253) extends from the distal end of the gradient section (252) to the bending memory position (255). When the limiting ring (250) is away from the step (251) and the bending memory position (255) is exposed, the expansion tube body (240) is bent and expanded in all directions at the bending memory position (255) based on the opening (253).

4. The dorsal root ganglion electrical stimulation puncture kit according to claim 3, characterized in that: The limiting ring (250) is connected to a first guide wire (254). The first guide wire (254) pushes the limiting ring (250) to push the gradient section (252) through the vertebral foramen. When the gradient section (252) passes through the vertebral foramen and the vertebral foramen needs to be expanded, the limiting ring (250) moves away from the step (251) under the pull of the first guide wire (254), so that the gradient section (252) bends and expands in all directions.

5. The dorsal root ganglion electrical stimulation puncture kit according to claim 4, characterized in that: Also included is an electrode (300), The electrode (300) comprises an electrode carrier (320), an electrode sheet (310) is arranged on an electrode segment (321) of the electrode carrier (320), and a barb (330) is arranged on a barb segment (322) of the electrode carrier (320). A memory strain ring (333) is provided between the barb (330) and the electrode carrier (320). When the electrode (300) is removed from the expansion tube body (240), the pressure on the memory strain ring (333) disappears and the original annular memory shape is restored, pushing the barbs (330) to expand to eliminate stress.

6. The dorsal root ganglion electrical stimulation puncture kit according to claim 5, characterized in that: The barbs (330) include main barbs (331) and micro barbs (334). The micro thorns (334) are arranged on the outside of the main barbs (331). The main barb (331) is arc-shaped, and the tail end (332) of the main barb (331) is curled inward.

7. The dorsal root ganglion electrical stimulation puncture kit according to claim 6, characterized in that: The diameter of the tail end (332) of the main barb (331) formed in a curled shape is smaller than the diameter of the memory strain ring (333) in the memory shape. When the main barb (331) is compressed and the tail end (332) contacts the electrode carrier (320), the memory strain ring (333) is in a deformed state.

8. The dorsal root ganglion electrical stimulation puncture kit according to claim 7, characterized in that: When the electrode (300) is arranged in the expansion tube body (240), the position of the memory strain ring (333) is between the bending memory position (255) and the step (251) in the axial direction, so that the memory strain ring (333) indirectly applies force to the expansion tube body (240) through the main barb (331).

9. An electrode for a puncture kit for electrical stimulation of dorsal root ganglia according to any one of claims 1 to 8, characterized in that: The electrode (300) comprises an electrode carrier (320), an electrode sheet (310) is arranged on an electrode segment (321) of the electrode carrier (320), and a barb (330) is arranged on a barb segment (322) of the electrode carrier (320). A memory strain ring (333) is provided between the barb (330) and the electrode carrier (320). When the electrode (300) is removed from the expansion tube body (240), the pressure on the memory strain ring (333) disappears and the original annular memory shape is restored, pushing the barbs (330) to expand to eliminate stress.

10. The electrode according to claim 9, characterized in that Within the axial length range where the limiting ring (250) contacts the expansion tube body (240), the expansion tube body (240) has a bending memory position (255), and the opening (253) extends from the distal end of the gradient section (252) to the bending memory position (255). When the electrode (300) is arranged in the expansion tube body (240), the memory strain ring (333) is located between the bending memory position (255) and the step (251) in the axial direction, and the memory strain ring (333) indirectly applies force to the expansion tube body (240) through the main barb (331).

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