Nerve traction device

Abstract

The invention provides a nerve traction device, relates to the field of medical equipment, and aims to solve the problem that a nerve traction instrument needs to be fixed on a long bone through a bone nail during auxiliary transection nerve injury repair at present, so that bone injury is easily caused, a bracket is adopted to form a clamping part, and the clamping part is fixed in a manner of sleeving the bone. The embedded guide hole allows the traction rope to penetrate through, so that the space occupied by the stent to tissues is reduced, movement of the adjusting sliding block located in vitro is transmitted to a to-be-dragged target through the traction rope, and the requirements for stretching and extending in-vivo broken-end nerves and assisting repair treatment of transection nerve injury are met; the adjusting sliding block and the adjusting nut which are located outside the body can conveniently control and adjust the tensioning amount.

Description

Technical Field

[0001] The invention relates to the field of medical equipment, and in particular to a nerve traction device. Background Art

[0002] Peripheral nerve injury includes damage that maintains axonal continuity and damage that completely cuts off the nerve. Completely cut nerves have nerve defects, and the ends are separated by gaps. Microsurgery is usually required to suture the broken ends of the nerves. Autologous nerve transplantation has always been the gold standard for repairing peripheral nerve defects. This method is commonly used in superficial cutaneous nerve transplantation, including the sural nerve and radial nerve. However, autologous nerve transplantation also has limitations in clinical application, such as limited sources of transplant donors, which cannot match the repaired nerves in many cases, and autologous nerve transplantation requires secondary surgery, resulting in new damage and functional loss in the donor area, and movement disorders. Stretching and extending nerves is a technical treatment for repairing peripheral nerve defects. Nerves have a certain growth potential when stretched. In some experiments, by continuously extending rat dorsal root ganglion axons at a rate of 4 mm / d in vitro, 5 cm long axon bundles can be generated within 14 days.

[0003] A Chinese patent (publication number CN107997845A, publication date 20180508) discloses a nerve extension traction device, in which a traction mounting frame is fixed on a bone screw, a reel is positioned and rotated to fit on the traction mounting frame via a wheel shaft, one end of the traction line is a nerve connection end fixedly connected to a nerve, and the other end of the traction line is guided to the outside of the tissue via a traction line guide assembly and wound and fixed on the reel, and the reel is equipped with a nerve extension operation device that drives the reel to rotate and can lock and hold. However, it still uses bone screws to fix the external traction frame, which will cause bone damage to the bone after the bone screws are placed, especially for patients with younger age and thinner long bones, which has a greater impact on the damage, and it is difficult to meet the demand for reducing adverse effects on bones during the repair and treatment of auxiliary transverse nerve injuries. Summary of the invention

[0004] The purpose of the present invention is to address the defects of the prior art and provide a nerve traction device, which uses a bracket to form a clamping part and is fixed by being sleeved outside the bone. The embedded guide hole is used for the traction cable to pass through, which reduces the space occupied by the bracket on the tissue. The movement of the adjustment slider located outside the body is transmitted to the target to be traction through the traction cable, meeting the needs of stretching and extending the broken end nerve in the body and assisting in the repair and treatment of transverse nerve injury. The adjustment slider and adjustment nut located outside the body can facilitate the control and adjustment of the tension amount.

[0005] In order to solve the above problems, the following solutions are adopted:

[0006] A nerve traction device, comprising:

[0007] The bracket is formed with a clamping part sleeved outside the bone, a guide hole is formed in the bracket on one side of the clamping part, and two ends of the guide hole are open and connected;

[0008] A lead screw is mounted on the bracket, an adjusting nut is matched on the lead screw, an adjusting slider is slidably matched with the lead screw, and the position of the adjusting slider relative to the lead screw is changed by moving the adjusting nut along the lead screw;

[0009] The traction rope has one end connected to the adjusting slider and the other end leading out through the guide hole to serve as a docking end connected to the target to be traction.

[0010] Furthermore, the bracket has a pair of spliced ​​clamps, the clamps have recesses, and the recesses of the pair of clamps are spliced ​​to form a clamping portion.

[0011] Furthermore, a fastening hole is provided on the clamp, and a pair of clamps are connected through the fastening hole and fasteners after being assembled.

[0012] Furthermore, the bracket extends in a direction away from the clamping portion to form an extension portion, and the screw rod is connected to the extension portion so that the adjustment nut and the adjustment slider are located outside the body.

[0013] Furthermore, the guide hole is located inside the bracket, and the opening at one end of the guide hole that passes through the extension part and connects to the outside is the introduction hole, and the opening at one end of the guide hole that is away from the introduction hole and crosses the clamping part is the outlet hole. The bracket is provided with a guide groove at the outlet hole for the traction rope to pass through.

[0014] Furthermore, at least two screw rods are connected to the bracket, each screw rod is respectively equipped with an adjusting nut and an adjusting slider, and the adjusting sliders on different screw rods are respectively connected to traction ropes.

[0015] Furthermore, the screw rod is equipped with two adjustment nuts that are spaced apart from each other, the adjustment slider is located between two adjacent adjustment nuts, and the two adjustment nuts are used to release and hold the adjustment slider.

[0016] Furthermore, a fixing hole is provided on the adjusting slider, and the traction rope is fixed after passing through the fixing hole. The traction rope is tightened or relaxed along with the movement of the adjusting slider along the screw rod.

[0017] Furthermore, the traction rope is a flexible rope.

[0018] Furthermore, the opening positions at both ends of the guide hole are provided with smooth chamfers, and the contact position between the bracket and the traction rope is smoothed.

[0019] Compared with the prior art, the present invention has the following advantages and positive effects:

[0020] In view of the problem that the current nerve traction device for assisting the repair of transverse nerve injury needs to be fixed on the long bone through bone screws, which easily leads to bone damage, a bracket is used to form a clamping part and is fixed by being mounted outside the bone. The embedded guide hole is for the traction cable to pass through, which reduces the space occupied by the bracket on the tissue. The movement of the adjustment slider outside the body is transmitted to the traction target through the traction cable, meeting the needs of stretching and extending the broken end nerve in the body and assisting the repair treatment of transverse nerve injury. The adjustment slider and adjustment nut outside the body can facilitate the control and adjustment of the tension amount.

[0021] Since the location and situation of nerve damage are complex and diverse, a single traction direction is often difficult to meet the repair needs of different nerve injuries. It is necessary to be able to pull the broken end nerve from multiple directions. To meet this demand, in this embodiment, at least two screws are connected to the bracket, and each screw is equipped with an adjustment nut and an adjustment slider, and the adjustment sliders on different screws are connected to traction ropes. Through this multi-thread rod design, multiple traction ropes can be used to pull the broken end nerve from different angles, or multiple traction ropes can be used to pull different targets to be pulled. The multi-thread rod structure provides multiple traction directions, which can more flexibly adapt to complex nerve injury situations.

[0022] By adjusting the position of the slider with the adjusting nut and the screw rod, the doctor can accurately fix the position of the slider on the screw rod, thereby accurately controlling the tension of the traction cable. During the nerve repair process, the doctor can finely adjust the tension of the traction cable according to the nerve recovery and treatment needs, providing a strong guarantee for the smooth repair of the nerve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 Schematic diagram of a nerve traction device in an embodiment of the present invention.

[0025] Figure 2 Schematic diagram of the coordination between the support and the traction cable of the nerve traction device in an embodiment of the present invention.

[0026] In the figure, 1, bracket; 2, guide groove; 3, clamp; 4, adjusting nut; 5, adjusting slider; 6, lead screw; 7, introduction hole; 8, fastening hole; 9, guide hole; 10, clamping part; 11, fixing hole; 12, traction rope. DETAILED DESCRIPTION

[0027] Example 1

[0028] In a typical embodiment of the present invention, Figure 1-Figure 2 As shown, a nerve traction device is provided.

[0029] The nerve extension traction device in the prior art is fixed on the bone screw through the traction mounting frame, and the reel is positioned and rotated to cooperate with the traction mounting frame through the wheel axle. One end of the traction line is connected to the nerve, and the other end is guided by the guide component and wound and fixed on the reel. The use of bone screws to fix the external traction frame will cause bone damage to the bone, especially for young patients with long and thin bones. Based on this, the present embodiment provides a nerve traction device, which fixes the bracket 1 by means of external sleeves, avoids the damage to the bone caused by the bone screws, reduces the adverse effects of the fixing device on the bone in the process of auxiliary transverse nerve injury repair treatment, and at the same time meets the needs of stretching and extending the broken end nerves in the body and facilitating the control and adjustment of the tension.

[0030] Specifically, Figure 1 and Figure 2 As shown, the nerve traction device includes a bracket 1, a lead screw 6, and a traction cable 12. The bracket 1 is formed with a clamping portion 10 sleeved outside the bone, and a guide hole 9 is formed in the bracket 1 on one side of the clamping portion 10, and the two ends of the guide hole 9 are open and connected. The clamping portion 10 sleeved outside the bone changes the traditional fixation method using bone screws, avoiding direct damage to the bone; the embedded guide hole 9 is for the traction cable 12 to pass through, which reduces the space occupied by the bracket 1 on the tissue and reduces the adverse effects on the surrounding tissue.

[0031] The lead screw 6 is mounted on the bracket 1, and the lead screw 6 is matched with an adjusting nut 4. The adjusting slider 5 is slidably matched with the lead screw 6, and the position of the adjusting slider 5 relative to the lead screw 6 is changed by the movement of the adjusting nut 4 along the lead screw 6. By moving the adjusting nut 4 on the lead screw 6, the position of the adjusting slider 5 can be accurately controlled, thereby providing a basis for adjusting the tension of the traction cable 12 and realizing the control of the stretching degree of the stump nerve.

[0032] One end of the traction cable 12 is connected to the adjusting slider 5, and the other end is led out through the guide hole 9 to serve as a docking end connected to the target to be traction. Function: The movement of the adjusting slider 5 outside the body is transmitted to the target to be traction (the broken end nerve in the body), so as to stretch and extend the broken end nerve in the body, and meet the needs of auxiliary transverse nerve injury repair treatment.

[0033] The fixing method of the clamping part 10 sleeved outside the bone reduces the damage to the bone, and is particularly suitable for patients of younger age and thinner long bones. The external adjustment slider 5 and the adjustment nut 4 facilitate the doctor to control and adjust the tension, thereby improving the operability and accuracy of the auxiliary transverse nerve injury repair treatment.

[0034] It should be pointed out that in order to solve the bone damage problem caused by the current bone screw fixation traction device, the present embodiment adopts a bracket 1 sleeved outside the bone for clamping and fixing. In order to achieve the clamping action, the bracket 1 adopts a pair of assembled clamps 3, each of which has a recess, and the recesses of the pair of clamps 3 are assembled to form a clamping portion 10. This design uses the recess to match the shape of the bone to provide a tight fit.

[0035] Technical effect: The clamping part 10 of the clamping hoop 3 can fit the surface of the bone tightly and provide a stable clamping force. In the actual nerve traction operation, even if the patient's limbs move slightly, the bracket 1 can remain in place, thereby ensuring the accuracy of the traction direction and strength and improving the success rate of nerve repair.

[0036] After the clamp 3 is assembled, a reliable fastening method must be used to ensure that the clamp 3 is always tightly connected during the entire nerve traction treatment process to maintain stable clamping of the bone. In this regard, in this embodiment, a fastening hole 8 is opened on the clamp 3, and after assembly, the fastening hole 8 is used to match a fastener (such as a bolt, nut, etc.) for connection. The fastener is matched with the fastening hole 8 to adjust the tightness of the fastening according to actual needs.

[0037] like Figure 2 As shown, the fastening holes 8 are distributed at the angular positions of the clamp 3, and are divided into two groups, each with two holes. The fastening holes 8 on each clamp 3 are connected to the fastening holes 8 of another clamp 3 with fasteners. By adjusting the fasteners, the clamp 3 can be closely fitted to the bone, thereby enhancing the overall stability of the bracket 1. The displacement of the bracket 1 caused by the separation of the clamp 3 during use is avoided, thereby ensuring the continuity and effectiveness of the nerve traction treatment.

[0038] In order to facilitate the doctor to operate the adjustment component and reduce the damage to the patient's body tissue, the adjustment nut 4 and the adjustment slider 5 need to be placed outside the body. To this end, the bracket 1 extends in a direction away from the clamping portion 10 to form an extension portion, and the extension portion can adopt a rod structure, and the screw rod is connected to the extension portion. The adjustment nut 4 and the adjustment slider 5 are located outside the body, and the doctor can directly operate outside the body.

[0039] The in vitro operation greatly reduces the difficulty of the doctor's operation and avoids the risk of tissue damage that may be caused by deep in vivo operation. The doctor can adjust the adjustment nut 4 and the adjustment slider 5 more conveniently and quickly, thereby improving the safety and convenience of the operation and facilitating the smooth progress of the nerve traction treatment.

[0040] It should be noted that the design of the guide hole 9 should ensure that the traction rope 12 can pass through and be led out smoothly, and should also minimize the space occupied by the tissue, and at the same time reduce the damage to the traction rope 12 to ensure the smooth traction process. Figure 1As shown, the guide hole 9 is located inside the bracket 1, and the opening at one end that passes through the extension part and connects to the outside is the introduction hole 7, and the opening at one end that is away from the introduction hole 7 and crosses the clamping part 10 is the lead-out hole, and a guide groove 2 is provided at the lead-out hole. Compared with installing pipes and the like outside the bracket 1 to establish a channel, the guide hole 9 is provided inside the bracket 1 in this embodiment, which reduces the invasion of the tissue by the external convex structure; and the clear introduction hole 7 and the lead-out hole make the path for the traction rope 12 to pass through clear; the guide groove 2 at the lead-out hole facilitates the traction rope 12 to pass through.

[0041] The internal guide hole 9 reduces the adverse effects on the tissue, reduces the contact between the traction rope 12 and the tissue, reduces the interference with the surrounding tissue, and reduces the risk of infection. The guide groove 2 at the lead-out hole allows the traction rope 12 to smoothly pass through the bracket 1, reduces the friction and obstruction between the traction rope 12 and the bracket 1, ensures the smooth operation of the traction rope 12 during the traction process, and improves the traction effect.

[0042] Since the location and situation of nerve damage are complex and diverse, a single traction direction is often difficult to meet the repair needs of different nerve injuries, and it is necessary to be able to traction the broken end nerve from multiple directions. To meet this demand, in this embodiment, at least two screw rods are connected to the bracket 1, each screw rod is respectively equipped with an adjustment nut 4 and an adjustment slider 5, and the adjustment sliders 5 on different screw rods are respectively connected to traction cables 12. Through this multi-screw rod design, multiple traction cables 12 can be used to traction the broken end nerve from different angles, or multiple traction cables 12 can be used to traction different targets to be tractioned.

[0043] The multi-screw structure provides multiple traction directions, which can more flexibly adapt to complex nerve injury situations. Doctors can adjust the adjustment nuts 4 and adjustment sliders 5 on different screws according to the specific location and direction of the nerve injury to achieve multi-angle and precise traction of the stump nerve, greatly improving the pertinence and effectiveness of nerve traction treatment.

[0044] During the nerve traction process, it is necessary to accurately control the position of the adjusting slider 5, and then accurately control the tension of the traction cable 12 to meet the requirements of different traction forces during the nerve repair process. Specifically, two adjusting nuts 4 are spaced apart on the screw rod, and the adjusting slider 5 is located between two adjacent adjusting nuts 4. The adjusting slider 5 is released and held by the cooperation of the two adjusting nuts 4. When the position of the adjusting slider 5 needs to be adjusted, the two adjusting nuts 4 are loosened, and after the adjusting slider 5 is moved to a suitable position, the adjusting nuts 4 are tightened to fix it.

[0045] By adjusting the nut 4 and the screw rod to constrain the position of the adjusting slider 5, the doctor can accurately fix the position of the adjusting slider 5 on the screw rod, thereby accurately controlling the tension of the traction cable 12. During the nerve repair process, the doctor can finely adjust the tension of the traction cable 12 according to the nerve recovery and treatment needs, providing a strong guarantee for the smooth repair of the nerve.

[0046] The adjusting slider 5 and the traction rope 12 need to be reliably connected to ensure that during the traction process, the traction rope 12 can be stably tightened or relaxed as the adjusting slider 5 moves, and will not be separated. To this end, a fixing hole 11 is provided on the adjusting slider 5, and the traction rope 12 is fixed after passing through the fixing hole 11. When the adjusting slider 5 moves along the screw rod, the traction rope 12 can move synchronously therewith.

[0047] The fixing hole 11 provides a stable connection point for the traction cable 12, ensuring a reliable connection between the traction cable 12 and the adjustment slider 5. During the nerve traction process, no matter how the adjustment slider 5 moves, the traction cable 12 can be stably tightened or relaxed, ensuring the smooth progress of the traction treatment and avoiding interruption of treatment or poor effect due to connection problems. In addition, the position of the fixing hole 11 can also be used to adjust the working length of the traction cable 12.

[0048] The selection of a suitable material for the traction rope 12 should ensure that it can effectively traction the nerves and reduce the damage to the surrounding tissues during the traction process to ensure the safety of the traction process. A flexible rope is selected as the traction rope 12. The flexible rope has good flexibility and can adapt to the complex physiological structure of the body. The material of the flexible rope can be selected from alloys, polymer materials, etc. that are friendly to the human body.

[0049] The flexibility of the flexible cable enables it to better conform to the bends and corners in the body during traction, reducing rigid friction and damage to surrounding tissues. At the same time, it can effectively transmit the movement of the adjustment slider 5 to achieve stable traction of the stump nerve, thereby improving the safety and effectiveness of nerve traction treatment.

[0050] The traction rope 12 is easily worn due to friction when passing through the guide hole 9 and contacting the bracket 1, which not only shortens the service life of the traction rope 12, but also may affect the smoothness of the traction process. In order to reduce such wear, in this embodiment, smooth chamfers are provided at the opening positions at both ends of the guide hole 9, and the contact position between the bracket 1 and the traction rope 12 is smoothed. In this way, the friction between the traction rope 12 and the bracket 1 is reduced.

[0051] The smooth chamfer and the smoothing of the contact position significantly reduce the wear of the traction cable 12 and extend the service life of the traction cable 12. At the same time, the reduced friction ensures the smoothness of the traction cable 12 during movement, avoids the traction cable 12 jamming or unstable traction force caused by excessive friction, and ensures the smooth progress of nerve traction treatment.

[0052] Combination Figure 1 and Figure 2 , the working process of the nerve traction device is explained in detail.

[0053] Device installation:

[0054] A pair of hoops 3 are wrapped around the outside of the target bone so that the concave part of the hoops 3 fits tightly against the bone. Through the fastening holes 8 on the hoops 3, fasteners (such as bolts and nuts) are used to firmly connect the two hoops 3 to form a stable clamping part 10, ensuring that the bracket 1 is firmly sleeved outside the bone.

[0055] At this time, the extension portion of the bracket 1 extending away from the clamping portion 10 is located outside the body, and the screw rod, the adjusting nut 4 and the adjusting slider 5 connected to the extension portion are also located outside the body for easy operation.

[0056] Traction rope 12 is installed:

[0057] One end of the traction rope 12 passes through the introduction hole 7 of the guide hole 9 inside the bracket 1, passes through the lead-out hole, and is guided to the outside of the body through the guide groove 2 at the lead-out hole.

[0058] The end of the traction rope 12 passing through is used as a butt end to be connected to the stump nerve to be pulled. At the same time, the other end of the traction rope 12 is passed through the fixing hole 11 on the adjusting slide block 5 and fixed to ensure that the traction rope 12 is reliably connected to the adjusting slide block 5.

[0059] Traction Adjustment:

[0060] According to the needs of nerve damage repair, the doctor adjusts the position of the adjusting slider 5 by rotating the adjusting nut 4 on the screw rod. Since two adjusting nuts 4 are spaced apart on the screw rod, the doctor first loosens the two adjusting nuts 4 to allow the adjusting slider 5 to slide freely on the screw rod.

[0061] After adjusting the position of the adjusting slide block 5, tighten the two adjusting nuts 4 to fix the adjusting slide block 5 to the corresponding position of the screw rod. When the adjusting slide block 5 moves along the screw rod, the traction rope 12 connected thereto will be tightened or relaxed therewith.

[0062] If multiple screw rods are connected to the bracket 1, the doctor can operate the adjustment nuts 4 and the adjustment sliders 5 on different screw rods according to the actual situation, and pull the stump nerve from multiple directions to better adapt to complex nerve injury situations.

[0063] Ongoing treatment and adjustment:

[0064] During the nerve repair treatment, the doctor will regularly observe the recovery of the nerve. According to the progress of nerve recovery and actual needs, the position of the adjustment nut 4 and the adjustment slider 5 will be adjusted again to change the tension of the traction cable 12 to provide appropriate traction force for the continuous repair of the nerve.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A nerve traction device, characterized in that: include: The bracket is formed with a clamping part sleeved outside the bone, a guide hole is formed in the bracket on one side of the clamping part, and two ends of the guide hole are open and connected; A lead screw is mounted on the bracket, an adjusting nut is matched on the lead screw, an adjusting slider is slidably matched with the lead screw, and the position of the adjusting slider relative to the lead screw is changed by moving the adjusting nut along the lead screw; The traction rope has one end connected to the adjusting slider and the other end leading out through the guide hole to serve as a docking end connected to the target to be traction.

2. The nerve traction device according to claim 1, characterized in that: The bracket has a pair of spliced ​​clamps, the clamps have recessed parts, and the recessed parts of the pair of clamps are spliced ​​to form a clamping part.

3. The nerve traction device according to claim 2, characterized in that: The clamp is provided with a fastening hole, and a pair of clamps are connected through the fastening holes and fasteners after being assembled.

4. The nerve traction device according to claim 1, 2 or 3, characterized in that: The bracket extends in a direction away from the clamping portion to form an extension portion, and the screw rod is connected to the extension portion so that the adjustment nut and the adjustment slider are located outside the body.

5. The nerve traction device according to claim 4, characterized in that: The guide hole is located inside the bracket, and the opening at one end of the guide hole that passes through the extension part and connects to the outside is the introduction hole, and the opening at one end of the guide hole that is away from the introduction hole and crosses the clamping part is the outlet hole. The bracket is provided with a guide groove at the outlet hole for the traction rope to pass through.

6. The nerve traction device according to claim 1, characterized in that: At least two screw rods are connected to the bracket, each screw rod is respectively matched with an adjusting nut and an adjusting slider, and the adjusting sliders on different screw rods are respectively connected with traction ropes.

7. The nerve traction device according to claim 6, characterized in that: The screw rod is matched with two adjusting nuts distributed at intervals, and the adjusting slider is located between two adjacent adjusting nuts. The two adjusting nuts are used to release and hold the adjusting slider.

8. The nerve traction device according to claim 1, characterized in that: The adjusting slider is provided with a fixing hole, and the traction rope is fixed after passing through the fixing hole. The traction rope is tightened or relaxed along with the movement of the adjusting slider along the screw rod.

9. The nerve traction device according to claim 8, characterized in that: The traction rope is a flexible rope.

10. The nerve traction device according to claim 8 or 9, characterized in that: The opening positions at both ends of the guide hole are provided with smooth chamfers, and the contact position between the bracket and the traction rope is smoothed.

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