Lower jaw impacted tooth traction device

Abstract

The invention discloses a lower jaw impacted tooth traction device, and belongs to the technical field of dental medical equipment. The mandibular impacted tooth traction device comprises a shell and a clamping mechanism, and further comprises a jacking mechanism and a traction mechanism, wherein the jacking mechanism is used for pressing one end, close to a bracket, of a push spring on an arch wire; the threading mechanism comprises an extrusion part, a driving wheel and a driven wheel, a sliding groove in the length direction of the bracket is formed in the shell, a first sliding block is slidably connected into the sliding groove, the extrusion part is used for applying extrusion force towards one end of the push spring to the first sliding block, and the side wall, away from one end of the bracket, of the push spring is clamped between the driving wheel and the driven wheel; the driving mechanism is used for driving the driving wheel to rotate so as to drive the push spring to rotate along the own rotation direction, and the end, close to the bracket, of the push spring is wound on the arch wire under the action of the jacking mechanism. According to the mandibular impacted tooth traction device disclosed by the invention, a new push spring can be mounted, so that the disassembly arch wire is prevented from loosening after being re-disassembled and re-assembled.

Description

Technical Field

[0001] The present invention relates to the technical field of dental medical equipment, in particular to a traction device for mandibular impacted teeth. Background Art

[0002] In the treatment of oral diseases, missing second molars is a common clinical problem. Traditional restorative methods such as dental implants and porcelain veneers can restore chewing function to a certain extent, but they have disadvantages such as high cost, damage to adjacent teeth, and high surgical risks. The presence of impacted mandibular wisdom teeth provides a new possibility for solving the problem of missing second molars. Since impacted teeth are generally oriented incorrectly, they require slight twisting correction. A push spring and archwire are used to assist in adjusting the angle of the impacted tooth. The archwire uses a continuous and gentle force to guide the movement of the impacted tooth, thereby pulling it.

[0003] Conventional traction treatment for mandibular impacted teeth typically utilizes an orthodontic archwire in conjunction with a push spring to apply a continuous, gentle force, guiding the impacted tooth to its normal dentition position. During the push spring replacement or installation process, conventional solutions require first completely removing the archwire from the bracket slot, manually threading the push spring through the archwire, and then reinserting the archwire into the bracket for securement. This process relies on the delicate manipulation of tools such as tweezers and needle holders, and requires multiple adjustments to the archwire's position and angle to ensure proper installation.

[0004] This leads to the following problems when replacing the push spring: repeated removal and installation of the arch wire will destroy the initial assembly accuracy between the arch wire and the bracket, resulting in a decrease in the fit tightness between the arch wire and the bracket groove, and the arch wire is prone to loosening. After the arch wire is loose, the continuous light force it exerts on the impacted tooth is weakened, resulting in inaccurate orthodontic force value. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems in the prior art and provide a mandibular impacted tooth traction device, which avoids the loosening problem caused by the arch wire after re-disassembly during the process of replacing the push spring.

[0006] The present invention provides a mandibular impacted tooth traction device, comprising a housing and a clamping mechanism, wherein the clamping mechanism is engaged with an archwire and is used to clamp the housing onto a bracket attached to the impacted tooth, and further comprising: A tightening mechanism is provided on the housing, and is used to press an end of the push spring close to the bracket onto the arch wire; The threading mechanism includes an extrusion portion, a driving wheel and a driven wheel. The housing is provided with a slide groove along the length direction of the bracket. A first slider is slidably connected in the slide groove. The extrusion portion is connected to the first slider. The extrusion portion is used to apply an extrusion force toward one end of the push spring to the first slider, so that the first slider abuts against the end of the push spring away from the bracket. The driving wheel and the driven wheel are arranged in parallel and are both rotatably connected to the first slider. The side wall of the push spring away from the end of the bracket is clamped between the driving wheel and the driven wheel. The driving mechanism is connected to the driving wheel and is used to drive the driving wheel to rotate, thereby driving the push spring to rotate along its own rotation direction, combined with the action of the tightening mechanism to wind the push spring close to the bracket end around the arch wire.

[0007] Preferably, the tightening mechanism includes a tightening block, which is provided on the shell body near one end of the bracket, and the tightening block abuts against one end of the push spring near the bracket, and the tightening block is provided with a wedge-shaped surface toward one end of the first slider, and the slide groove is provided on the side wall of the shell body near the arch wire, and the side wall of the push spring can abut against the outer edge of the slide groove, and the slide groove is used to limit the push spring to prevent the push spring from sliding sideways, and the extrusion part drives the push spring to slide along the length direction of the slide groove through the first slider, and when the push spring is squeezed and bent, the end of the push spring near the bracket can slide from the wedge surface to the end of the tightening block near the arch wire.

[0008] Preferably, the tightening mechanism includes a tightening block, which is arranged on the shell body near one end of the bracket, and the tightening block abuts against one end of the push spring near the bracket toward one end of the first slider, and a wedge-shaped surface is provided on the end of the tightening block toward the first slider, and the slide groove is arranged on the side wall of the shell body near the arch wire, and the side wall of the push spring can abut against the outer edge of the slide groove, and the slide groove is used to limit the push spring to prevent the push spring from sliding sideways, and the extrusion part drives the push spring to slide along the length direction of the slide groove through the first slider, and when the push spring is squeezed and bent, the push spring near the bracket can slide from the wedge surface to the arch wire and the end of the tightening block near the arch wire.

[0009] Preferably, the tightening block is provided with a sliding rod, the shell is provided with a first sliding hole perpendicular to the sliding groove, the first sliding block is slidably connected to the first sliding hole, a first spring is provided outside the sliding rod, the first spring abuts against the tightening block, and the first spring is used to apply an elastic force toward the arch wire to the tightening block. Under the action of the supporting force applied by the arch wire to the side wall of the push spring, the tightening block moves away from one end of the arch wire so that the end face of the tightening block toward one end of the first sliding block sinks into the side wall of the shell.

[0010] Preferably, the extrusion part includes a screw and a knob, the screw is arranged parallel to the slide groove, the screw is rotatably connected to the shell, the knob is arranged outside the shell, the knob is fixedly connected to the screw, the first slider is provided with a threaded hole, the first slider is threadedly connected to the screw through the threaded hole, and rotating the knob can drive the first slider to move toward one side of the bracket through the screw.

[0011] Preferably, the driving mechanism includes a second slider, the first slider is provided with a first through-axis hole coaxially arranged with the threaded hole, the second slider is rotatably connected to the first through-axis hole, the first slider can apply a thrust along the axial direction of the screw to the second slider, the driving wheel is fixedly connected to the second slider, a second through-axis hole is provided in the second slider, the screw passes through the second through-axis hole, and a groove is provided on the screw along its length direction, a driving block is slidably connected in the groove, and the driving block is fixedly connected to the second slider.

[0012] Preferably, the clamping mechanism includes a connecting rod and two hooks, the two hooks are respectively hung on the arch wires on both sides of the bracket, and the shell is provided with two second sliding holes perpendicular to the length direction of the screw, the two hooks are respectively slidably connected in the two second sliding holes, the two hooks are connected by a connecting rod, and each hook is provided with a second spring, the second spring is used to apply an elastic force to the hook thereon away from the side of the bracket, so that the bracket is pressed tightly against the side wall of the shell.

[0013] Preferably, the side wall of the first sliding groove is provided with a guiding inclined surface, and the guiding inclined surface is used to guide the sliding of the push spring so that the side wall of the push spring fits against the guiding inclined surface.

[0014] Preferably, the outer walls of the driving wheel and the driven wheel are both provided with rubber rings, and the outer walls of the rubber rings are in contact with the side walls of the push springs.

[0015] Preferably, the helix angle of the spring is smaller than the helix angle of the screw thread.

[0016] Preferably, the outer edges of the shell are all arc transition surfaces.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: a mandibular impacted tooth traction device of the present invention utilizes a tightening mechanism to tighten the other end of the push spring, that is, the end close to the bracket, to the arch wire, and the driving mechanism drives the active wheel to rotate. The friction between the active wheel and the side wall of the push spring drives the push spring to rotate, and the push spring rotates around its own rotation direction. The end of the push spring away from the bracket will be wound around the arch wire, and the extrusion part is utilized to apply a constant extrusion force toward the push spring to the first slider, so that while the push spring is wound around the arch wire, the push spring is slowly pushed toward one end of the bracket until the push spring is completely wound around the arch wire, thereby realizing the installation of a new push spring without removing the arch wire, thereby avoiding the loosening of the arch wire when removing the arch wire, and the resulting weakening of the continuous light force applied to the impacted tooth, thereby ensuring the accuracy of the orthodontic force value.

[0018] Under the continuous squeezing of the squeezing part and the supporting force of the wedge surface, the end of the push spring close to the bracket is pushed toward the arch wire by the wedge surface. Combined with the self-rotation of the push spring, the end of the push spring close to the bracket will be screwed onto the arch wire, and the side wall of the tightening block facing the arch wire abuts against the side wall of the push spring, thereby continuously applying squeezing force toward the arch wire to the push spring, preventing the push spring from falling off the arch wire during self-rotation, and ensuring that the push spring can be stably screwed into the arch wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the position structure of the bracket and archwire on the impacted tooth; Figure 2 This is a structural diagram of the first working state of the present invention; Figure 3 This is a structural diagram of the second working state of the present invention; Figure 4 This is a schematic structural diagram of the AA surface of the present invention; Figure 5 Schematic diagram of the structure of the BB surface of the present invention; Figure 6 It is a structural schematic diagram of the driving wheel of the present invention.

[0020] Description of reference numerals: 1. Impacted tooth; 101. Housing; 102. Clamping mechanism; 103. Arch wire; 104. Bracket; 105. Clamping mechanism; 106. Push spring; 107. First slider; 108. Extrusion part; 109. Driving wheel; 110. Driven wheel; 111. Slide groove; 201. Clamping block; 202. Wedge surface; 301. Slide rod; 302. First spring; 401. Lead screw; 402. Knob; 501. Second slider; 502. Groove; 503. Driving block; 601. Connecting rod; 602. Hook; 603. Second spring; 7. Guide slope; 8. Rubber ring. DETAILED DESCRIPTION

[0021] The following is combined with Figures 1-6 , the specific embodiments of the present invention are described in detail, but it should be understood that the scope of protection of the present invention is not limited by the specific embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] like Figures 1-6As shown, a mandibular impacted tooth traction device provided by the present invention includes a shell 101 and a clamping mechanism 102, wherein the clamping mechanism 102 is clamped with the arch wire 103, and the clamping mechanism 102 is used to clamp the shell 101 to the bracket 104 pasted on the impacted tooth 1, and further includes: a tightening mechanism 105, a threading mechanism and a driving mechanism, the tightening mechanism 105 is provided on the shell 101, and the tightening mechanism 105 is used to press one end of the push spring 106 close to the bracket 104 onto the arch wire 103; the threading mechanism includes an extrusion part 108, a driving wheel 109 and a driven wheel 110, and the shell 101 is provided with a slide groove 111 along the length direction of the bracket 104, and the first slider 107 is slidably connected in the slide groove 111. The extrusion portion 108 is connected to the first slider 107, and the extrusion portion 108 is used to apply an extrusion force to the first slider 107 toward one end of the push spring 106, so that the first slider 107 abuts against the end of the push spring 106 away from the bracket 104. The driving wheel 109 and the driven wheel 110 are arranged in parallel and are both rotatably connected to the first slider 107. The side wall of the push spring 106 away from the end of the bracket 104 is clamped between the driving wheel 109 and the driven wheel 110; the driving mechanism is connected to the driving wheel 109, and the driving mechanism is used to drive the driving wheel 109 to rotate, thereby driving the push spring 106 to rotate along its own rotation direction, combined with the action of the tightening mechanism 105, to wind the push spring 106 close to the bracket 104 on the arch wire 103.

[0023] The working principle of the above embodiment is briefly described below: When the device is in use, the original push spring 106 between the impacted tooth 1 and its adjacent support tooth is cut off and removed, and one end of the new push spring 106 is clamped between the master-slave wheel and the driven wheel 110. The shell 101 is clamped on the bracket 104 pasted on the impacted tooth 1 through the clamping mechanism 102, and then the other end of the push spring 106, that is, the end close to the bracket 104, is pressed against the arch wire 103 by the tightening mechanism 105. The tightening mechanism 105 can achieve constant pressure application through elastic pressure or threaded tightening to ensure that the end of the push spring 106 and the arch wire 103 form a stable fulcrum.

[0024] The driving wheel 109 is then driven to rotate by a drive mechanism. This drive mechanism can utilize a micro-servo motor coupled with a reduction gear set. By precisely controlling the rotational speed and direction (this is the same as the rotational direction of the push spring 106), the direction of rotation of the push spring 106 can be precisely adjusted. Because the sidewall of the push spring 106, away from the bracket 104, is clamped between the driving wheel 109 and the driven wheel 110, the driving wheel 109 and the driven wheel 110 form a V-shaped clamping structure. The gear meshing transmission ensures uniform clamping force. When the driving wheel 109 rotates, the friction between it and the sidewall of the push spring 106 drives the push spring 106 to rotate.

[0025] Combined with the compressive force applied by the tensioning mechanism 105 to the end of the push spring 106 near the bracket 104 (this compressive force is positively correlated with the elastic deformation of the tensioning mechanism 105 or the threaded depth), the end of the push spring 106 near the bracket 104 gradually winds around the arch wire 103 during rotation, forming a tight and regular spiral winding structure. As the drive mechanism continues to operate, the push spring 106 winds around the arch wire 103 at a set pitch and tension. During this process, the extrusion portion 108 (which can employ a spring-pushing or hydraulic damping structure) applies a constant compressive force toward the push spring 106 to the first slider 107. This compressive force, guided by the slide slot 111, causes the first slider 107 to drive the master and slave wheel assemblies to slide synchronously toward the bracket 104.

[0026] This dynamic follow-up mechanism ensures that during the winding process of the push spring 106, its unwound part is always clamped by the active wheel 109 and the driven wheel 110, avoiding the clamping failure caused by the shortening of the length of the push spring 106. At the same time, the constant force output of the extrusion part 108 can compensate for the axial contraction force generated when the push spring 106 is wound, so that the winding tension remains consistent, and finally the push spring 106 is evenly wound from the free end to the bracket 104 end over the entire length, forming an elastic traction structure that meets the requirements of orthodontic mechanics. The entire process does not require manual adjustment of the clamping position, and automatic winding is achieved through mechanical linkage, which significantly improves the efficiency and accuracy of the installation of the push spring 106. The winding tension can be multi-dimensionally regulated by the speed of the driving mechanism, the pressure of the tightening mechanism 105 and the thrust of the extrusion part 108 to meet the clinical needs of traction of different impacted teeth.

[0027] The mandibular impacted tooth traction device of the present invention can realize the installation of the new push spring 106 without removing the arch wire 103, thereby avoiding the loosening of the removed arch wire 103 after re-disassembly and the resulting weakening of the continuous light force applied to the impacted tooth 1, ensuring the accuracy of the orthodontic force value, and thus ensuring the traction effect of the replaced push spring 106.

[0028] On the basis of the above embodiment, in order to continuously apply a squeezing force toward the arch wire 103 to the push spring 106 , the push spring 106 is prevented from being stably screwed into the arch wire 103 .

[0029] like Figure 2 and Figure 3As shown, the tightening mechanism 105 includes a tightening block 201, which is provided on the housing 101 near one end of the bracket 104, and the tightening block 201 abuts against one end of the push spring 106 near the bracket 104. The tightening block 201 is provided with a wedge-shaped surface 202 at one end facing the first slider 107. The slide groove 111 is provided on the side wall of the housing 101 near the arch wire 103, and the side wall of the push spring 106 can abut against the outer edge of the slide groove 111. The slide groove 111 is used to limit the push spring 106 to prevent the push spring 106 from sliding sideways. The extrusion portion 108 drives the push spring 106 to slide along the length direction of the slide groove 111 through the first slider 107. When the push spring 106 is squeezed and bent, the end of the push spring 106 near the bracket 104 can slide from the wedge surface 202 to the end of the tightening block 201 near the arch wire 103.

[0030] When the first guide rail 107 is in engagement with the first guide rail 108, the spring 106 is secured to the first guide rail 109, thereby securing the spring 106 against the first guide rail 108. When the extrusion part 108 drives the first slide 107 to move along the length direction of the slide groove 111 toward the side close to the bracket 104, the first slide 107 squeezes the push spring 106, and the push spring 106 is bent and deformed. Due to the limiting effect of the edge of the slide groove 111, the push spring 106 can only bend toward the side close to the arch wire 103, thereby driving the push spring 106 close to the bracket 104 to slide toward the side of the arch wire 103. When the arch wire 103 slides toward the wedge surface 202 close to the bracket 104, under the continuous extrusion of the extrusion part 108, the wedge surface 202 is combined with the push spring 106 to form a fixed arch wire. 2, the end of the push spring 106 close to the bracket 104 is pushed toward the side of the arch wire 103 by the wedge-shaped surface 202. Combined with the self-rotation of the push spring 106, the end of the push spring 106 close to the bracket 104 will be screwed into the arch wire 103. At this time, the side wall of the tightening block 201 facing the arch wire 103 abuts against the side wall of the push spring 106, thereby continuously applying an extrusion force toward the arch wire 103 to the push spring 106, preventing the push spring 106 from escaping from the arch wire 103 during self-rotation, and ensuring that the push spring 106 can be stably screwed into the arch wire 103.

[0031] Preferably, if Figure 2 and Figure 3As shown, the tightening block 201 is provided with a sliding rod 301, and the housing 101 is provided with a first sliding hole perpendicular to the sliding groove 111, the first sliding block 107 is slidably connected to the first sliding hole, and a first spring 302 is provided outside the sliding rod 301, and the first spring 302 abuts against the tightening block 201, and the first spring 302 is used to apply an elastic force toward the arch wire 103 to the tightening block 201. Under the action of the supporting force applied by the arch wire 103 to the side wall of the push spring 106, the tightening block 201 moves away from one end of the arch wire 103, so that the end face of the tightening block 201 toward one end of the first sliding block 107 sinks into the side wall of the housing 101. When the push rod 101 is pressed against the first slide 107, the push rod 101 is pressed against the first slide 107, and the push rod 101 is pressed against the first slide 107.

[0032] Further solutions, such as Figure 2 and Figure 3 As shown, the extrusion portion 108 includes a screw 401 and a knob 402, the screw 401 is arranged parallel to the slide groove 111, the screw 401 is rotatably connected to the shell 101, the knob 402 is arranged outside the shell 101, the knob 402 is fixedly connected to the screw 401, the first slider 107 is provided with a threaded hole, the first slider 107 is threadedly connected to the screw 401 through the threaded hole, and rotating the knob 402 can drive the first slider 107 to move toward the side of the bracket 104 through the screw 401. In the process of winding the push spring 106 on the arch wire 103, by turning the knob 402, the knob 402 drives the lead screw 401 to rotate, thereby driving the first slider 107 to move along the length direction of the lead screw 401 through the threaded hole, thereby driving the first slider 107 to move toward one end of the bracket 104, thereby squeezing the push spring 106 to move toward one end of the bracket 104. Since the driving wheel 109 and the driven wheel 110 are rotatably connected to the first slider 107, it can be ensured that the side wall of the push spring 106 near the end of the first slider 107 is always between the driving wheel 109 and the driven wheel 110.

[0033] As a preferred solution, Figure 2 、 Figure 3 、 Figure 5 and Figure 6 As shown, the driving mechanism includes a second slider 501, the first slider 107 is provided with a first through-axis hole coaxially arranged with the threaded hole, the second slider 501 is rotatably connected to the first through-axis hole, the first slider 107 can apply an axial thrust along the screw 401 to the second slider 501, the driving wheel 109 is fixedly connected to the second slider 501, the second slider 501 is provided with a second through-axis hole, the screw 401 passes through the second through-axis hole, and the screw 401 is provided with a groove 502 along its length direction, and a driving block 503 is slidably connected in the groove 502, and the driving block 503 is fixedly connected to the second slider 501. When the knob 402 is turned to drive the lead screw 401 to rotate, thereby driving the first slider 107 to move toward one end of the bracket 104, the first slider 107 drives the driving wheel 109 to move toward one end of the bracket 104 through the second slider 501. At the same time, the lead screw 401 drives the driving block 503 to rotate through the groove 502, and the driving block 503 drives the second slider 501 fixed thereto to rotate, thereby driving the driving wheel 109 to rotate, thereby pushing the push spring 106 and driving the push spring 106 to rotate, simplifying the transmission mechanism of the entire device and improving the reliability of the entire device.

[0034] A better solution, such as Figure 2-Figure 4 As shown, the clamping mechanism 102 includes a connecting rod 601 and two hooks 602, and the two hooks 602 are respectively hung on the arch wire 103 on both sides of the bracket 104. The housing 101 is provided with two second sliding holes perpendicular to the length direction of the lead screw 401. The two hooks 602 are respectively slidably connected in the two second sliding holes. The two hooks 602 are connected by the connecting rod 601, and each hook 602 is provided with a second spring 603. The second spring 603 is used to apply an elastic force to the hook 602 thereon away from the side of the bracket 104, so that the bracket 104 is pressed tightly against the side wall of the housing 101. When the clamping mechanism 102 fixes the housing 101 on the bracket 104, the two hooks 602 are driven by the connecting rod 601 to slide toward the side close to the arch wire 103 until the two hooks 602 are completely extended from the housing 101, and the second spring 603 on each hook 602 is squeezed and compressed. Then, the two hooks 602 are respectively hung on the arch wire 103 on both sides of the bracket 104, and the connecting rod 601 is released. Under the action of the elastic force of the second spring 603, the bracket 104 is pressed against the side wall of the housing 101, thereby ensuring that the end of the push spring 106 close to the bracket 104 can be stably pressed against the arch wire 103 by the pressing block 201.

[0035] As a preferred solution, Figure 2 、 Figure 3 and Figure 6As shown, the side wall of the first slide groove 111 is provided with a guide slope 7, which is used to guide the sliding of the push spring 106 so that the side wall of the push spring 106 is in contact with the guide slope 7. By providing the guide slope 7, when the second slider 501 pushes the push spring 106 to move toward the end of the bracket 104, the guide slope 7 can guide the movement of the push spring 106, thereby further preventing the push spring 106 from shaking, ensuring the smooth movement of the push spring 106, and ensuring that the push spring 106 can be stably wound around the arch wire 103.

[0036] Further solutions, such as Figure 2 、 Figure 3 、 Figure 5 and Figure 6 As shown, the outer walls of the driving wheel 109 and the driven wheel 110 are both provided with a rubber ring 8, and the outer wall of the rubber ring 8 is in contact with the side wall of the push spring 106. By providing the rubber ring 8 on the outer walls of the driving wheel 109 and the driven wheel 110, the friction between the driving wheel 109 and the push spring 106 can be increased, thereby preventing the push spring 106 and the driving wheel 109 from slipping, thereby ensuring that the driving wheel 109 can normally drive the push spring 106 to rotate.

[0037] As a preferred solution, Figure 3 As shown, the helix angle of the spring is smaller than the helix angle of the thread of the lead screw 401. Setting the helix angle of the spring smaller than the helix angle of the thread of the lead screw 401 ensures that when the knob 402 is rotated, the length of the push spring 106 wound around the arch wire 103 is smaller than the distance the lead screw 401 drives the second slider 501 to move, thereby ensuring that the second slider 501 can continuously apply an axial squeezing force to the push spring 106, so that the drive spring can be smoothly wound around the arch wire 103.

[0038] As a preferred solution, Figure 2-Figure 5 As shown, the outer edges of the housing 101 are all arc transition surfaces. By setting the outer edges of the housing 101 as arc transition surfaces, the outer edges of the housing 101 can be prevented from causing damage to the oral mucosa of the patient.

[0039] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A mandibular impacted tooth traction device, comprising a housing and a clamping mechanism, wherein the clamping mechanism is engaged with an archwire and is used to clamp the housing onto a bracket attached to the impacted tooth, characterized in that: Also includes: A tightening mechanism is provided on the housing, and is used to press an end of the push spring close to the bracket onto the arch wire; The threading mechanism includes an extrusion portion, a driving wheel and a driven wheel. The housing is provided with a slide groove along the length direction of the bracket. A first slider is slidably connected in the slide groove. The extrusion portion is connected to the first slider. The extrusion portion is used to apply an extrusion force toward one end of the push spring to the first slider, so that the first slider abuts against the end of the push spring away from the bracket. The driving wheel and the driven wheel are arranged in parallel and are both rotatably connected to the first slider. The side wall of the push spring away from the end of the bracket is clamped between the driving wheel and the driven wheel. The driving mechanism is connected to the driving wheel and is used to drive the driving wheel to rotate, thereby driving the push spring to rotate along its own rotation direction, combined with the action of the tightening mechanism to wind the push spring close to the bracket end around the arch wire.

2. The mandibular impacted tooth traction device according to claim 1, characterized in that: The tightening mechanism includes a tightening block, which is arranged on the shell body near one end of the bracket, and the tightening block abuts against one end of the push spring near the bracket, and the tightening block is provided with a wedge-shaped surface toward one end of the first slider, and the slide groove is provided on the side wall of the shell body near the arch wire, and the side wall of the push spring can abut against the outer edge of the slide groove, and the slide groove is used to limit the push spring to prevent the push spring from sliding sideways, and the extrusion part drives the push spring to slide along the length direction of the slide groove through the first slider, and when the push spring is squeezed and bent, the push spring near the bracket can slide from the wedge surface to the end of the tightening block near the arch wire.

3. The mandibular impacted tooth traction device according to claim 2, characterized in that: The tightening block is provided with a sliding rod, and the shell is provided with a first sliding hole perpendicular to the sliding groove. The first sliding block is slidably connected to the first sliding hole. A first spring is provided outside the sliding rod, and the first spring abuts against the tightening block. The first spring is used to apply an elastic force toward the arch wire to the tightening block. Under the action of the supporting force applied by the arch wire to the side wall of the push spring, the tightening block moves away from one end of the arch wire so that the end face of the tightening block toward one end of the first sliding block sinks into the side wall of the shell.

4. The mandibular impacted tooth traction device according to claim 1, characterized in that: The extrusion part includes a screw and a knob. The screw is arranged parallel to the slide groove and is rotatably connected to the shell. The knob is arranged outside the shell and is fixedly connected to the screw. The first slider is provided with a threaded hole. The first slider is threadedly connected to the screw through the threaded hole. Rotating the knob can drive the first slider to move toward one side of the bracket through the screw.

5. The mandibular impacted tooth traction device according to claim 4, characterized in that: The driving mechanism includes a second slider, the first slider is provided with a first through-axis hole coaxially arranged with the threaded hole, the second slider is rotatably connected to the first through-axis hole, the first slider can apply a thrust along the axial direction of the screw to the second slider, the driving wheel is fixedly connected to the second slider, a second through-axis hole is provided in the second slider, the screw passes through the second through-axis hole, and a groove is provided on the screw along its length direction, a driving block is slidably connected in the groove, and the driving block is fixedly connected to the second slider.

6. The mandibular impacted tooth traction device according to claim 5, characterized in that: The clamping mechanism includes a connecting rod and two hooks, and the two hooks are respectively hung on the arch wires on both sides of the bracket. Two second sliding holes perpendicular to the length direction of the lead screw are provided on the shell. The two hooks are slidably connected to the two second sliding holes respectively. The two hooks are connected by a connecting rod. Each hook is provided with a second spring, and the second spring is used to apply an elastic force to the hook thereon away from the side of the bracket so that the bracket is pressed tightly against the side wall of the shell.

7. The mandibular impacted tooth traction device according to claim 1, wherein: The side wall of the first sliding groove is provided with a guiding inclined surface, and the guiding inclined surface is used to guide the sliding of the push spring so that the side wall of the push spring fits with the guiding inclined surface.

8. The mandibular impacted tooth traction device according to claim 1, characterized in that: The outer walls of the driving wheel and the driven wheel are both provided with rubber rings, and the outer walls of the rubber rings are in contact with the side walls of the push springs.

9. The mandibular impacted tooth traction device according to claim 1, wherein: The helix angle of the spring is smaller than the helix angle of the screw thread.

10. The mandibular impacted tooth traction device according to claim 1, wherein: The outer edges of the shell are all arc transition surfaces.

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