Dynamic force-adjustable scoliosis orthosis

Abstract

The present application relates to the technical field of medical devices, and discloses a dynamic force adjusting scoliosis orthosis, which comprises a plastic plate, a pulling belt fixedly connected to the side wall of a pressure mechanism, and a through hole formed in the side wall of the plastic plate, wherein the present application is configured to solve the problem of skin abrasion caused by the long-term close contact between the second pressing plate and the torso during daily activities, and the first pressing plate and the second pressing plate are arranged inside the device, so that the patient can twist the lead screw, the lead screw rotates along the inner wall of the nut, and the sliding block one slides left and right along the outer wall of the track, and in this process, the roller two enters the groove inside the sliding block one, and since the first pressing plate and the pressure receiving assembly are no longer limited, the first pressing plate no longer exerts pressure on the torso, and the second pressing plate replaces the first pressing plate to exert pressure on the torso, and since the contact surfaces of the first pressing plate and the second pressing plate with the torso are different, the patient can switch the pressure position of the torso during correction, thereby avoiding skin abrasion at the pressure position caused by long-term pressure on a single position.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a dynamic force-adjustable scoliosis orthosis. Background Technology

[0002] Scoliosis is a three-dimensional deformity of the spine, which can occur in the sagittal and coronal planes, with sagittal deformities being the most common. Idiopathic scoliosis accounts for 80% of all cases, and it mostly occurs during the growth and development period. The cause is unknown, and it is divided into infantile, juvenile, and adolescent types. Scoliosis orthotics are suitable for correcting mild to moderate adolescent idiopathic scoliosis with a Cobb angle of 20° to 45°.

[0003] Orthotics typically employ a "rear-opening rigid frame + multiple sets of straps for fixation" structure: When worn, the frame is first wrapped around the torso, then 3-5 sets of straps are tightened around the back, waist, and shoulders for fixation, allowing the corrective force to act directly on the torso. However, during the orthotics process, the skin remains in close contact with the straps, and the waist is repeatedly compressed, leading to continuous friction between the skin and the straps. Over time, this can easily cause epidermal abrasion, and in severe cases, dermal damage. To address these shortcomings, this invention proposes an improved solution. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a dynamic force-adjustable scoliosis orthosis, including a plastic plate, a tension strap fixedly connected to the side wall of the pressure mechanism, and a central through hole in the side wall of the plastic plate, and further comprising: The snap-fit ​​mechanism is fixedly installed on the side wall of the plastic sheet. The snap-fit ​​mechanism includes a fixing frame that is fixedly connected to the side wall of the plastic sheet, and a sliding groove is provided on the inner wall of the fixing frame. An auxiliary mechanism is slidably disposed on the side wall of the buckling mechanism. The auxiliary mechanism includes a second slide groove that is opened at one end of the fixed frame away from the slide groove. The pressure mechanism is fixedly installed on the outer wall of the auxiliary mechanism. The process involves the patient wearing the plastic plate on their torso, and then tightening the straps to complete the fitting and correction process simultaneously.

[0005] Preferably, the latching mechanism includes: The fixing component is fixedly installed on the side wall of the fixing frame one; The pressure application component is slidably disposed on the inner wall of the slide groove one; During operation, the pressure mechanism forces the pressure-applying component to slide along the inner wall of the slide.

[0006] Preferably, the auxiliary mechanism includes: A limiting component is slidably disposed on the inner wall of the second slide groove; A rotating component is fixedly mounted on the side wall of the limiting component; When the pressure mechanism is running, the pressure mechanism will drive the limiting component to slide along the inner wall of the slide groove two through the rotating component.

[0007] Preferably, the pressure mechanism includes: The pressure-bearing component is fixedly installed on the side wall of the pressure-applying component; The twisting component is slidably mounted on the side wall of the fixed component; When the torsion component moves, it will drive the pressure application component to slide along the inner wall of the slide groove one through the pressure receiving component.

[0008] Preferably, the fixing component includes a track fixedly connected to the inner wall of the fixing frame, and a nut fixedly connected to the side wall of the fixing frame. When the torsion component is twisted, it is restricted by the nut and slides along the outer wall of the track.

[0009] Preferably, the pressure application component includes a round rod that is slidably disposed on the inner wall of the slide groove, and a pressure plate is fixedly connected to the side wall of the round rod. When the pressure component is under pressure, the pressure plate and the round rod will slide along the inner wall of the slide groove.

[0010] Preferably, the limiting component includes a round rod 2 that is slidably connected to the inner wall of the slide groove 2, and a pressure plate 2 is fixedly connected to the side wall of the round rod 2; Among them, the second pressure plate and the first pressure plate are rake-shaped and are misaligned with each other.

[0011] Preferably, the rotating assembly includes a second fixing frame bolted to the side wall of the second pressure plate, and a first roller is fixedly connected to the side wall of the second fixing frame; Before wearing the garment, medical staff can use a screwdriver to turn the screws inside the pressure plate to adjust the gap between the fixation frame and the pressure plate. The larger the gap, the greater the pressure applied to the patient's torso after wearing the garment.

[0012] Preferably, the pressure-bearing component includes a fixing frame three fixedly connected to one side wall of the pressure plate, and a roller two rotatably connected to the side wall of the fixing frame three; Under normal conditions, both roller one and roller two are in contact with the side wall of the torsion assembly.

[0013] Preferably, the torsion assembly includes a slider 1 slidably connected to the outer wall of the track, a positioning block fixedly connected to the side wall of the slider 1, and a lead screw rotatably connected to the inner wall of the through hole of the positioning block. The outer wall of the lead screw is threaded to the inner wall of the through hole of the nut. When the lead screw is twisted, the lead screw will drive the slider to slide along the outer wall of the track through the positioning block.

[0014] The present invention has the following beneficial effects: (1) In order to solve the problem of skin abrasion caused by the pressure plate 2 being in close contact with the torso for a long time during daily activities, the present invention sets pressure plate 1 and pressure plate 2 inside the device. When adjustment is needed, the patient can turn the screw, which rotates along the inner wall of the nut and pushes slider 1 to slide left and right along the outer wall of the track. During this process, roller 2 will enter the groove of slider 1. Since pressure plate 1 and the pressure-bearing components are no longer restricted, pressure plate 1 will no longer apply pressure to the torso, and pressure plate 2 will replace pressure plate 1 to apply pressure to the torso. Through the above design, since the contact surfaces of pressure plate 1 and pressure plate 2 with the torso are different, the patient can switch the pressure position of the torso during correction, avoiding skin abrasion at the pressure position due to long-term pressure at a single position.

[0015] (2) The present invention utilizes the design of alternating pressure of the first and second pressure plates. The two ends of the slider are designed to be long, and the screw needs to be tightened to the point that it cannot be rotated when the patient twists the screw. Therefore, during the process of changing the pressure position of the first and second pressure plates, the first and second pressure plates will contact the torso at the same time. As the slider slides, one of the first or second pressure plates will contract. Through the above design, when the first and second pressure plates alternate, the second or first pressure plate will first apply pressure to the torso before switching, thus avoiding the effect of repeated twisting of the spine during the correction process.

[0016] (3) The present invention utilizes the different pressure points of the pressure plate one and pressure plate two on the torso. Since the spine is on both sides during the correction process, the stage of spinal correction in adolescents is also the stage of bone extension in adolescents. During this stage, if a single rib is subjected to pressure for a long time, it will cause the costal cartilage to grow slowly, be shorter, and become narrower laterally. The alternating design ensures that the ribs at the pressure points have time to relax during the correction process, reducing the pressure on the ribs during correction and lowering the probability of rib deformity.

[0017] (4) The present invention adopts a design that uses a torsion screw to drive the slider to slide. When the patient makes an adjustment, he only needs to twist in one direction until he can no longer twist to complete the adjustment and thus complete the pressure position. The operation process is simple. Moreover, the design of using a nut and screw to force the slider to slide means that even when the roller is in the groove of the slider, the reaction force of the torso on the pressure plate cannot push the slider to the left during the interval of the patient's twisting. Through the above design, only the slider can drive the roller and roller 1 to move. The roller and roller 2 cannot drive the slider to move laterally, which effectively reduces the influence of the torso on the device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the rear side of the overall structure of the present invention; Figure 3 This is a schematic diagram of the plastic sheet of the present invention; Figure 4 This is a partial schematic diagram of the fixing component of the present invention; Figure 5 This is a schematic diagram of the pressure application component of the present invention; Figure 6 This is an exploded view of the auxiliary mechanism components of the present invention; Figure 7 This is a schematic diagram of the auxiliary mechanism of the present invention; Figure 8 This is a schematic diagram of the pressure mechanism of the present invention; Figure 9 This is a schematic diagram of the working state of the torsion component of the present invention. Figure 1 ; Figure 10 This is a schematic diagram of the working state of the torsion component of the present invention. Figure 2 .

[0020] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Buckling mechanism; 11. Fixing component; 12. Pressure application component; 13. Plastic plate; 14. Pull belt; 15. Through hole; 111. Fixing frame one; 112. Track; 113. Nut; 121. Slide groove one; 122. Round rod one; 123. Pressure plate one; 2. Auxiliary mechanism; 21. Limiting component; 22. Rotating component; 211. Slide groove two; 212. Round rod two; 213. Pressure plate two; 221. Fixing frame two; 222. Roller one; 3. Pressure mechanism; 31. Pressure-bearing component; 32. Torsion component; 311. Fixing frame three; 312. Roller two; 321. Slider one; 322. Positioning block; 323. Lead screw. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1, please refer to Figures 1-8 This invention is a dynamic force-adjustable scoliosis orthosis, including a plastic plate 13, a tension strap 14 fixedly connected to the side wall of the pressure mechanism 3, and a central through hole 15 formed in the side wall of the plastic plate 13, and further including: The buckling mechanism 1 is fixedly installed on the side wall of the plastic plate 13. The buckling mechanism 1 includes a fixing frame 111 fixedly connected to the side wall of the plastic plate 13. A sliding groove 121 is provided on the inner wall of the fixing frame 111. Auxiliary mechanism 2 is slidably disposed on the side wall of the buckling mechanism 1. Auxiliary mechanism 2 includes a second slide groove 211 opened at one end of the fixed frame 111 away from the slide groove 121. Pressure mechanism 3 is fixedly installed on the outer wall of auxiliary mechanism 2; The patient needs to wear the plastic plate 13 on their torso, and then tighten the traction strap 14 to complete the wearing and correction process at the same time.

[0023] The latching mechanism 1 includes: Fixing component 11 is fixedly installed on the side wall of fixing frame 111; Pressure application component 12 is slidably disposed on the inner wall of slide groove 121; When the pressure mechanism 3 is running, the pressure mechanism 3 will force the pressure application component 12 to slide along the inner wall of the slide groove 121.

[0024] Auxiliary mechanism 2 includes: Limiting component 21 is slidably disposed on the inner wall of slide groove 211; Rotating component 22 is fixedly installed on the side wall of limiting component 21; When the pressure mechanism 3 is running, the pressure mechanism 3 will drive the limiting component 21 to slide along the inner wall of the slide groove 211 through the rotating component 22.

[0025] Pressure mechanism 3 includes: The pressure-bearing component 31 is fixedly disposed on the side wall of the pressure-applying component 12; The twisting component 32 is slidably disposed on the side wall of the fixed component 11; When the torsion component 32 moves, the torsion component 32 will drive the pressure application component 12 to slide along the inner wall of the slide groove 121 through the pressure receiving component 31.

[0026] Example 2, please refer to Figures 4-10 The present invention is a dynamic force-adjustable scoliosis orthosis. Based on the first embodiment, the fixing component 11 includes a track 112 fixedly connected to the inner wall of the fixing frame 111, and a nut 113 fixedly connected to the side wall of the fixing frame 111. When the torsion component 32 is twisted, it is restricted by the nut 113 and slides along the outer wall of the track 112.

[0027] The pressure application component 12 includes a round rod 122 that is slidably disposed on the inner wall of the slide groove 121, and a pressure plate 123 is fixedly connected to the side wall of the round rod 122. When the pressure component 31 is under pressure, the pressure plate 123 and the round rod 122 will slide along the inner wall of the slide groove 121.

[0028] The limiting component 21 includes a round rod 212 that is slidably connected to the inner wall of the slide groove 211, and a pressure plate 213 is fixedly connected to the side wall of the round rod 212. By utilizing the different pressure points applied to the torso using the pressure plates 123 and 213, the spine is supported by ribs on both sides during the correction process. The spinal correction stage for adolescents is also the stage of skeletal extension. During this stage, prolonged pressure on a single rib can cause the costal cartilage to grow slowly, become shorter, and narrower laterally. The alternating design ensures that the ribs at the pressure points have time to relax during the correction process, reducing the pressure on the ribs and lowering the probability of rib deformities.

[0029] The rotating assembly 22 includes a fixing frame 221 bolted to the side wall of the pressure plate 213, and a roller 222 is fixedly connected to the side wall of the fixing frame 221. The device employs a design where a torsion screw 323 drives the slider 321 to slide. When adjusting, the patient only needs to twist in one direction until it can no longer be twisted to complete the adjustment and achieve the pressure position. The operation is simple. Furthermore, the design of using a nut 113 and a screw 323 to force the slider 321 to slide by twisting ensures that even when the roller 222 is in the inclined position of the groove of the slider 321, the reaction force of the torso on the pressure plate 213 during the interval of the patient's twisting cannot push the slider 321 to the left. Through the above design, only the slider 321 can drive the rollers 222 and 312 to move, while the rollers 222 and 312 cannot drive the slider 321 to move laterally, effectively reducing the impact of the torso on the device.

[0030] The pressure-bearing component 31 includes a fixing frame 311 fixedly connected to the side wall of the pressure plate 123, and a roller 312 rotatably connected to the side wall of the fixing frame 311. By utilizing the design of alternating pressure on the first pressure plate 123 and the second pressure plate 213, and by designing the two ends of the slider 321 to be relatively long, and by requiring the patient to tighten the screw 323 to the point where it cannot rotate when turning it, during the process of changing the pressure positions of the first pressure plate 123 and the second pressure plate 213, the first pressure plate 123 and the second pressure plate 213 will simultaneously contact the torso. As the slider 321 slides, one of the pressure plates 123 or the second pressure plate 213 will contract. Through the above design, when the first pressure plate 123 and the second pressure plate 213 alternate, the second pressure plate 213 or the first pressure plate 123 will first apply pressure to the torso before switching, thus avoiding the impact of repeated twisting of the spine on the correction effect during the correction process.

[0031] The torsion assembly 32 includes a slider 321 that is slidably connected to the outer wall of the track 112, a positioning block 322 that is fixedly connected to the side wall of the slider 321, and a lead screw 323 that is rotatably connected to the inner wall of the through hole of the positioning block 322. To address the issue of skin abrasion caused by prolonged close contact between the pressure plate 213 and the torso during daily activities, this device is equipped with pressure plate 123 and pressure plate 213. When adjustment is needed, the patient can twist the lead screw 323, which rotates along the inner wall of the nut 113 and pushes the slider 321 to slide left and right along the outer wall of the track 112. As the patient twists the lead screw 323, the lead screw 323 will drive the slider 321 to move towards the groove 121. The inclined surface of the groove of the slider 321 will push the roller 222 and the pressure plate 213 towards the torso, and force the pressure plate 213 to stick tightly to the outer wall of the torso.

[0032] One specific application of this embodiment is as follows: Before use, medical staff can use a screwdriver to turn the screws inside the pressure plate 213 to adjust the gap between the fixing frame 221 and the pressure plate 213. The larger the gap, the greater the pressure applied to the patient's torso after wearing. After the adjustment is completed, the patient needs to wear the plastic plate 13 on the torso and then tighten the pull strap 14 to complete the wearing and correction process at the same time.

[0033] To address the issue of skin abrasion caused by prolonged close contact between the pressure plate 213 and the torso during daily activities, this device includes pressure plate 123 and pressure plate 213. When adjustment is needed, the patient can rotate the lead screw 323. The lead screw 323 rotates along the inner wall of the nut 113, pushing the slider 321 to slide left and right along the outer wall of the track 112. This movement process will present... Figures 8 to 10 The state, the initial state, such as Figure 8As shown, the sidewall of roller 212 is in contact with the plane of slider 1121, while roller 122 is located in the groove of slider 1121. Roller 212 will push pressure plate 123 to press against the patient's torso through roller 1122. As the patient twists screw 323, screw 323 will drive slider 1121 to move towards groove 121. The inclined surface of the groove of slider 1121 will push roller 122 and pressure plate 213 towards the torso, forcing pressure plate 213 to press against the outer wall of the torso. During this process, since roller 212 is still in contact with the plane of slider 1121, as... Figure 9 As shown, at this time, both pressure plate 123 and pressure plate 213 are attached to the outer wall of the torso. The patient continues to turn the screw 323, and roller 2 312 will enter the groove of slider 1 321. Since pressure plate 123 and pressure component 31 are no longer restricted, pressure plate 123 will no longer apply pressure to the torso, and pressure plate 213 will replace pressure plate 123 to apply pressure to the torso. Through the above design, since the contact surfaces of pressure plate 123 and pressure plate 213 with the torso are different, the patient can switch the pressure position of the torso during correction, avoiding skin abrasion at the pressure position due to long-term pressure at a single position.

[0034] By utilizing the design of alternating pressure on the first pressure plate 123 and the second pressure plate 213, and by designing the two ends of the slider 321 to be relatively long, and by requiring the patient to tighten the screw 323 to the point where it cannot rotate when turning it, during the process of changing the pressure positions of the first pressure plate 123 and the second pressure plate 213, the first pressure plate 123 and the second pressure plate 213 will simultaneously contact the torso. As the slider 321 slides, one of the pressure plates 123 or the second pressure plate 213 will contract. Through the above design, when the first pressure plate 123 and the second pressure plate 213 alternate, the second pressure plate 213 or the first pressure plate 123 will first apply pressure to the torso before switching, thus avoiding the impact of repeated twisting of the spine on the correction effect during the correction process.

[0035] By utilizing the different pressure points applied to the torso using the pressure plates 123 and 213, the spine is supported by ribs on both sides during the correction process. The spinal correction stage for adolescents is also the stage of skeletal extension. During this stage, prolonged pressure on a single rib can cause the costal cartilage to grow slowly, become shorter, and narrower laterally. The alternating design ensures that the ribs at the pressure points have time to relax during the correction process, reducing the pressure on the ribs and lowering the probability of rib deformities.

[0036] The device employs a design where a torsion screw 323 drives the slider 321 to slide. When adjusting, the patient only needs to twist in one direction until it can no longer be twisted to complete the adjustment and achieve the pressure position. The operation is simple. Furthermore, the design of using a nut 113 and a screw 323 to force the slider 321 to slide by twisting ensures that even when the roller 222 is in the inclined position of the groove of the slider 321, the reaction force of the torso on the pressure plate 213 during the interval of the patient's twisting cannot push the slider 321 to the left. Through the above design, only the slider 321 can drive the rollers 222 and 312 to move, while the rollers 222 and 312 cannot drive the slider 321 to move laterally, effectively reducing the impact of the torso on the device.

[0037] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dynamic force-adjustable scoliosis orthosis, comprising a plastic plate (13), wherein a tension strap (14) is fixedly connected to the side wall of the pressure mechanism (3), and a through hole (15) is provided in the side wall of the plastic plate (13), characterized in that, Also includes: The buckling mechanism (1) is fixedly installed on the side wall of the plastic plate (13). The buckling mechanism (1) includes a fixing frame (111) fixedly connected to the side wall of the plastic plate (13). A sliding groove (121) is provided on the inner wall of the fixing frame (111). Auxiliary mechanism (2) is slidably disposed on the side wall of the buckle mechanism (1). The auxiliary mechanism (2) includes a second slide groove (211) opened at one end of the fixed frame (111) away from the slide groove (121). Pressure mechanism (3), which is fixedly installed on the outer wall of auxiliary mechanism (2); In this process, the patient needs to wear the plastic plate (13) on the torso and then tighten the traction strap (14) to complete the wearing and correction process at the same time.

2. The dynamically adjustable scoliosis orthosis according to claim 1, characterized in that: The latching mechanism (1) includes: Fixing component (11), the fixing component (11) is fixedly disposed on the side wall of fixing frame one (111); Pressure application component (12), which is slidably disposed on the inner wall of slide groove (121); When the pressure mechanism (3) is running, the pressure mechanism (3) will force the pressure application component (12) to slide along the inner wall of the slide groove (121).

3. The dynamically adjustable scoliosis orthosis according to claim 2, characterized in that: The auxiliary mechanism (2) includes: A limiting component (21) is slidably disposed on the inner wall of the slide groove (211); Rotating assembly (22), which is fixedly disposed on the side wall of limiting assembly (21); When the pressure mechanism (3) is running, the pressure mechanism (3) will drive the limiting component (21) to slide along the inner wall of the slide groove (211) through the rotating component (22).

4. The dynamically adjustable scoliosis orthosis according to claim 3, characterized in that: The pressure mechanism (3) includes: A pressure-bearing component (31) is fixedly disposed on the side wall of the pressure-applying component (12); A twisting assembly (32) is slidably disposed on the side wall of the fixed assembly (11); When the twisting component (32) moves, the twisting component (32) will drive the pressure application component (12) to slide along the inner wall of the slide groove (121) through the pressure receiving component (31).

5. A dynamically adjustable scoliosis orthosis according to claim 4, characterized in that: The fixing component (11) includes a track (112) fixedly connected to the inner wall of the fixing frame (111), and a nut (113) fixedly connected to the side wall of the fixing frame (111). When the torsion assembly (32) is torsion, the torsion assembly (32) is restricted by the nut (113) and slides along the outer wall of the track (112).

6. A dynamically adjustable scoliosis orthosis according to claim 4, characterized in that: The pressure application component (12) includes a round rod (122) that is slidably disposed on the inner wall of the slide groove (121), and a pressure plate (123) is fixedly connected to the side wall of the round rod (122). When the pressure component (31) is under pressure, the pressure plate (123) and the round rod (122) will slide along the inner wall of the groove (121).

7. A dynamically adjustable scoliosis orthosis according to claim 6, characterized in that: The limiting component (21) includes a round rod (212) that is slidably connected to the inner wall of the slide groove (211), and a pressure plate (213) is fixedly connected to the side wall of the round rod (212). Among them, the second pressure plate (213) and the first pressure plate (123) are rake-shaped and are misaligned with each other.

8. A dynamically adjustable scoliosis orthosis according to claim 7, characterized in that: The rotating assembly (22) includes a fixing frame two (221) bolted to the side wall of the pressure plate two (213), and a roller one (222) is fixedly connected to the side wall of the fixing frame two (221). Before wearing the garment, medical staff can use a screwdriver to turn the screw inside the pressure plate 2 (213) to adjust the gap between the fixation frame 2 (221) and the pressure plate 2 (213). The larger the gap, the greater the pressure applied to the patient's torso after wearing the garment.

9. A dynamically adjustable scoliosis orthosis according to claim 6, characterized in that: The pressure-bearing component (31) includes a fixing frame three (311) fixedly connected to the side wall of the pressure plate one (123), and a roller two (312) is rotatably connected to the side wall of the fixing frame three (311). Under normal conditions, both roller one (222) and roller two (312) are in contact with the side wall of the torsion assembly (32).

10. A dynamically adjustable scoliosis orthosis according to claim 5, characterized in that: The torsion assembly (32) includes a slider (321) slidably connected to the outer wall of the track (112), a positioning block (322) is fixedly connected to the side wall of the slider (321), and a lead screw (323) is rotatably connected to the inner wall of the through hole of the positioning block (322). The outer wall of the lead screw (323) is threadedly connected to the inner wall of the through hole of the nut (113). When the lead screw (323) is twisted, the lead screw (323) will drive the slider (321) to slide along the outer wall of the track (112) through the positioning block (322).

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