Force limiting dental elevator

Abstract

This application relates to the field of medical assistive device technology, specifically to a force-limiting dental elevator, including a handle, an elevator rod, and a force-limiting component. The handle includes a grip and a mounting base; the elevator rod is rotatably mounted on the mounting base; the force-limiting component is mounted on the mounting base. In the direction of elevator rod rotation, the force-limiting component drives the handle and elevator rod together. When the torque between the handle and elevator rod exceeds a first preset torque, the force-limiting component disengages the drive connection between the handle and elevator rod in the direction of rotation. In this application, when a doctor applies a force to the elevator rod using the handle in the direction of rotation that exceeds the first preset torque, the force-limiting component disengages the drive connection between the handle and elevator rod in the direction of rotation. This means that once the applied force exceeds the first preset torque, the elevator rod will no longer apply excessive force with the rotation of the handle, thereby preventing damage to the inferior alveolar nerve of the mandibular canal.

Description

Technical Field

[0001] This application relates to the field of medical assistive device technology, and more specifically, to force-limiting dental elevators. Background Technology

[0002] In dental extraction surgery, dental elevators serve as important auxiliary instruments, functioning similarly to levers. Traditional dental elevators typically have a flat wedge or curved hook-shaped tip, with the middle section forming a fulcrum and the rear end serving as a handle. During use, the tip is wedged between the tooth crown and the alveolar bone, using the alveolar ridge as a fulcrum. Downward pressure is applied through the handle, causing an upward prying force that dislocates the tooth crown. This lever structure effectively amplifies the applied force, but precise control of the fulcrum position and the direction of force is crucial. For beginners, applying excessive force when using the dental elevator can lead to tooth root fracture or even damage to the inferior alveolar nerve within the mandibular canal. Utility Model Content

[0003] The purpose of this application is to provide a force-limiting dental elevator that can limit the amount of force applied by a dentist to a patient's teeth, thereby reducing unnecessary damage to the patient.

[0004] To achieve the above objectives, this utility model provides a force-limiting dental elevator, comprising:

[0005] A handle, the handle including a grip and a mounting base, the grip and the mounting base being fixedly connected;

[0006] A push rod, which is rotatably mounted on the mounting base and is capable of reciprocating on the mounting base;

[0007] A force limiting component is mounted on the mounting base. In the rotation direction of the push rod, the force limiting component enables the handle and the push rod to be connected in a transmission manner. When the torque between the handle and the push rod is greater than a first preset torque, the force limiting component disengages the handle and the push rod from the transmission connection in the rotation direction.

[0008] In an optional embodiment, the mounting base is provided with an elongated mounting hole, and the push rod is rotatably mounted in the elongated mounting hole of the mounting base and can slide along the length direction of the elongated mounting hole;

[0009] The force limiting component includes a first meshing tooth, a second meshing tooth, and a first elastic element. The first meshing tooth is mounted on the mounting base, and the second meshing tooth is mounted on the push rod.

[0010] The push rod has an engaging position and a stress-relieving position in the mounting elongated hole. When the push rod is in the engaging position, the second engaging tooth is driven to engage with the first engaging tooth, so that the mounting base and the push rod are driven to engage.

[0011] When the push rod is in the unloading position, the second meshing tooth disengages from the first meshing tooth, and the push rod can reciprocate relative to the mounting base;

[0012] The first elastic element pushes the push rod to move and switches the push rod to the engagement position. The magnitude of the elastic force of the first elastic element is positively correlated with the magnitude of the first preset torque.

[0013] In an optional embodiment, a spring hole is provided on the wall of the mounting elongated hole of the mounting base, one end of the first elastic member is installed in the spring hole, and the other end of the first elastic member extends out of the spring hole and can push the push rod.

[0014] In an optional embodiment, the spring hole is a through hole;

[0015] The force-limiting toothed elevator also includes an adjusting block, which is threaded into the inner wall of the spring hole. The adjusting block can move axially during rotation and pushes one end of the first elastic element.

[0016] In an optional embodiment, the mounting elongated hole has an elliptical cross-section in a direction perpendicular to the axis.

[0017] In an optional embodiment, a rotating shaft is fixedly mounted on the pushrod, and the rotating shaft is rotatably mounted in the mounting elongated hole.

[0018] In an alternative embodiment, the rotating shaft has an elliptical cross-section in a direction perpendicular to the axis.

[0019] In an optional embodiment, the first meshing tooth includes a plate portion and a tooth portion, the plate portion being fixedly mounted on the mounting base, the tooth portion being fixedly mounted on the plate portion, and the number of the tooth portions being at least three.

[0020] In an optional embodiment, the force limiting component includes a third engaging tooth, a locking arm, and a second elastic element;

[0021] The third meshing tooth is fixedly installed on the push rod at one end near the mounting base;

[0022] The clamping arm has two ends. One end of the clamping arm is hinged to the mounting base. The other end of the clamping arm can rotate around the one end of the clamping arm and has a clamping position and a sliding position. In the clamping position, the other end of the clamping arm engages with the third meshing tooth to prevent the third meshing tooth and the push rod from rotating on the mounting base.

[0023] The second elastic element pushes the other end of the locking arm to rotate toward the locking position or has a tendency to rotate. When the torque between the push rod and the mounting base is greater than the second preset torque, the third meshing tooth pushes the other end of the locking arm to switch to the sliding position. The third meshing tooth and the push rod can rotate relative to the mounting base.

[0024] The elastic force of the second elastic element is positively correlated with the magnitude of the second preset torque.

[0025] In an optional implementation, the number of the third meshing teeth is at least three.

[0026] In this application, when the force applied by the dentist to the tap in the rotational direction using the handle exceeds a first preset torque, the force limiting component will disengage the transmission connection between the handle and the tap in the rotational direction. This means that once the applied force exceeds the first preset torque, the tap will no longer apply excessive force as the handle rotates, thereby preventing the tap from damaging the inferior alveolar nerve of the mandibular canal.

[0027] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the structure from one perspective of one embodiment of the force-limiting dental elevator provided in this application;

[0030] Figure 2 A partial cross-sectional view of one embodiment of the force-limiting dental elevator provided in this application;

[0031] Figure 3 for Figure 2 Schematic diagram of the structure at point A;

[0032] Figure 4 A two-view structural schematic diagram of one embodiment of the force-limiting dental elevator provided in this application;

[0033] Figure 5 for Figure 4 Sectional view along the BB direction;

[0034] Figure 6A partial enlarged view of another embodiment of the force-limiting dental elevator provided in this application;

[0035] Figure 7 A two-view structural schematic diagram of another embodiment of the force-limiting dental elevator provided in this application;

[0036] Figure 8 for Figure 7 A schematic diagram of the structure at point C.

[0037] icon:

[0038] 100 - Handle; 110 - Grip; 120 - Mounting base; 121 - Mounting elongated hole; 122 - Spring hole; 130 - Adjusting block;

[0039] 200 - Tappet; 210 - Rotating shaft;

[0040] 300 - Force limiting component; 310 - First meshing tooth; 311 - Plate body; 312 - Tooth body; 320 - Second meshing tooth; 330 - First elastic element;

[0041] 410 - Third meshing tooth; 420 - Clamping arm; 430 - Second elastic element. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] Embodiments of this application provide force-limiting dental elevators, such as... Figures 1 to 3 As shown, the force-limiting elevator includes a handle 100, a push rod 200, and a force-limiting component 300.

[0046] The handle 100 includes a grip 110 and a mounting base 120, which are fixedly connected. Exemplarily, the grip 110 and the mounting base 120 are fixedly connected by welding, gluing, bolting, snap-fitting, or integral molding.

[0047] The grip 110 provides a grip position for the doctor to hold the handle 100.

[0048] Mounting base 120 is used to provide a mounting base for tappet 200 and force limiting assembly 300.

[0049] like Figure 1 As shown, the tap 200 is rotatably mounted on the mounting base 120, allowing the tap 200 to reciprocate on the mounting base 120. Exemplarily, the tap 200 has a mounting end and a working end at its two ends, the mounting end being rotatably mounted on the mounting base 120, and the working end being used to pry open the patient's teeth.

[0050] For example, the rotation axis 210 of the mounting end of the push rod 200 on the mounting base 120 is perpendicular to the rotation direction of the push rod 200.

[0051] For example, the working end has a curved structure adapted to the curved surface of the patient's root canal.

[0052] like Figure 2 and Figure 3 As shown, the force limiting component 300 is mounted on the mounting base 120. In the rotation direction of the push rod 200, the force limiting component 300 enables the handle 100 and the push rod 200 to be connected in a transmission manner.

[0053] When the torque between the handle 100 and the elevator 200 is greater than the first preset torque, the force limiting component 300 disengages the transmission connection between the handle 100 and the elevator 200 in the rotational direction. That is, when the force applied by the dentist using the handle 100 to the elevator 200 in the rotational direction is less than or equal to the first preset torque, the force can be transmitted from the handle 100 to the elevator 200 through the force limiting component 300. The dentist can then move or rotate the elevator 200 using the handle 100, thereby prying out the patient's tooth. When the force applied by the dentist using the handle 100 to the elevator 200 in the rotational direction is greater than the first preset torque, the force limiting component 300 disengages the transmission connection between the handle 100 and the elevator 200 in the rotational direction. The force applied by the dentist to the handle 100 cannot be transmitted to the elevator, preventing the elevator 200 from breaking the tooth root and damaging the inferior alveolar nerve of the mandibular canal, thus protecting the patient from unnecessary injury.

[0054] To achieve force limiting component 300, such as Figure 2 and Figure 3 As shown, in one embodiment, the mounting base 120 is provided with an elongated mounting hole 121, and the push rod 200 is rotatably installed in the elongated mounting hole 121 of the mounting base 120 and can slide along the length direction of the elongated mounting hole 121.

[0055] The force limiting component 300 includes a first meshing tooth 310, a second meshing tooth 320, and a first elastic element 330. The first meshing tooth 310 is mounted on the mounting base 120. For example, the first meshing tooth 310 is fixedly mounted on the mounting base 120 by means of welding, gluing, snap-fitting, bolting, or integral molding.

[0056] The second meshing tooth 320 is mounted on the tappet 200. Exemplarily, the second meshing tooth 320 is fixedly mounted on the mounting end of the tappet 200 by means of welding, gluing, snap-fitting, bolting, or integral molding.

[0057] The tappet 200 has an engagement position and a stress relief position in the mounting hole 121.

[0058] like Figure 3 As shown, when the tappet 200 is in the engaged position, the second engaging tooth 320 is driven to engage with the first engaging tooth 310, so that the mounting base 120 and the tappet 200 are driven to engage.

[0059] When the push rod 200 is in the unloading position, the second meshing tooth 320 disengages from the first meshing tooth 310, and the push rod 200 can swing back and forth relative to the mounting base 120.

[0060] For example, when the tappet 200 moves from the unloading position to the engagement position, the tappet 200 and the second engagement tooth 320 approach the first engagement tooth 310; when the tappet 200 moves from the engagement position to the unloading position, the tappet 200 and the second engagement tooth 320 move away from the first engagement tooth 310.

[0061] The first elastic element 330 pushes the push rod 200 to move and switch to the engaged position. The magnitude of the elastic force of the first elastic element 330 is positively correlated with the magnitude of the first preset torque. For example, the greater the elastic force of the first elastic element 330, the greater the first preset torque; the smaller the elastic force of the first elastic element 330, the smaller the first preset torque.

[0062] For example, one end of the first elastic element 330 is disposed on the mounting base 120, and the other end of the first elastic element 330 is connected to the push rod 200. When the first elastic element 330 is in a compressed state, it pushes the push rod 200 and the second meshing tooth 320 toward the first meshing tooth 310, thereby engaging the first meshing tooth 310 and the second meshing tooth 320. The first meshing tooth 310 and the second meshing tooth 320 can transmit force to each other, and at this time the push rod 200 is in the engaged position. However, in some embodiments, the first elastic element 330 is in an extended state, and the first elastic element 330 pulls the push rod 200 and the second meshing tooth 320 toward the first meshing tooth 310, which will not be described in detail here.

[0063] In the rotation direction of the lever 200, when the force applied by the doctor to the handle 100 is greater than the first preset torque, the second meshing tooth 320 applies a reaction force to the first meshing tooth 310, and the second meshing tooth 320 disengages from the first meshing tooth 310. The first meshing tooth 310 and the second meshing tooth 320 can no longer transmit force to each other, so in the rotation direction, the force applied by the doctor to the handle 100 cannot be transmitted to the lever 200.

[0064] For example, the first elastic element 330 includes, but is not limited to: helical spring, wave spring, butterfly spring, ring spring, leaf spring, steel leaf spring, rubber spring, air spring, etc.

[0065] In this application, the tap 200 has an engaging position and a decelerating position in the mounting hole 121. When it is in the engaging position, the first engaging tooth 310 and the second engaging tooth 320 are connected to drive the normal transmission between the handle 100 and the tap 200. When the force applied by the doctor to the handle 100 is greater than the first preset torque, the second engaging tooth 320 applies a reaction force to the first engaging tooth 310, and the two disengage. The tap 200 switches to the decelerating position. This engagement and disengagement mechanism is reliable and responsive, and can promptly prevent excessive force from being transmitted to the tap 200, effectively avoiding damage to the teeth and surrounding tissues.

[0066] In order to provide an installation position for the first elastic element 330, such as Figures 3 to 5 As shown, in one embodiment, a spring hole 122 is provided on the wall of the mounting elongated hole 121 of the mounting base 120. One end of the first elastic member 330 is installed in the spring hole 122, and the other end of the first elastic member 330 extends out of the spring hole 122 and can push the push rod 200.

[0067] A spring hole 122 is provided on the wall of the mounting hole 121 to install the first elastic element 330, providing a clear and fixed installation position for the first elastic element 330 and preventing the first elastic element 330 from shaking or shifting randomly within the mounting base 120.

[0068] Since one end of the first elastic element 330 is installed in the spring hole 122 and the other end can push the push rod 200, this installation method allows the first elastic element 330 to maintain a stable elastic force output during operation. The spring hole 122 provides a relatively stable support environment for the first elastic element 330, reducing the interference of external factors on the elastic force of the first elastic element 330, thereby ensuring the reliable response of the force limiting component 300 under the set torque, and ensuring that when the force applied by the doctor to the handle 100 is greater than the first preset torque, the force limiting component 300 can play its role in a timely and accurate manner.

[0069] In order to adjust the elastic force of the first elastic element 330, and thus adjust the magnitude of the first preset torque, such as... Figure 6 As shown, in one embodiment, the spring hole 122 is a through hole.

[0070] For example, the first elastic element 330 includes, but is not limited to: helical spring, wave spring, butterfly spring, leaf spring, steel leaf spring, rubber spring, etc.

[0071] The force limiting toothed elevator also includes an adjusting block 130, which is threaded to the inner wall of the spring hole 122. The adjusting block 130 is a cylinder with external threads on its outer wall, and the inner wall of the spring hole 122 has internal threads that mate with the external threads of the adjusting block 130.

[0072] During the rotation of the adjusting block 130, it can move axially and push one end of the first elastic member 330.

[0073] like Figure 6 As shown, rotating the adjusting block 130 in the forward direction moves it closer to the first elastic member 330, compressing the first elastic member 330 and increasing its elastic force, thereby increasing the first preset torque. Rotating the adjusting block 130 in the reverse direction moves it away from the first elastic member 330, causing the first elastic member 330 to extend and decrease its elastic force, thereby decreasing the first preset torque.

[0074] To facilitate the reset of the tappet 200, such as Figure 4 As shown, in one embodiment, the mounting elongated hole 121 has an elliptical cross-section in a direction perpendicular to the axis.

[0075] For example, the major axis of the elliptical cross-section of the mounting hole 121 is parallel to the movement path of the push rod 200, which is the path by which the push rod 200 moves from the engagement position to the unloading position or from the unloading position to the engagement position.

[0076] The mounting hole 121 has an elliptical cross-section perpendicular to the axis. Compared to a circular or other regular-shaped cross-section, the ellipse has a longer span in the direction perpendicular to the axis. When the push rod 200 is displaced or deflected due to force during operation, this elliptical cross-section provides greater guiding space for the push rod 200 to return to its original position. During the return process, the push rod 200 can return to its initial position more smoothly along the major axis of the elliptical cross-section, reducing the difficulty of return caused by space constraints.

[0077] The elliptical cross-section allows the elevator 200 to deflect at a certain angle in the direction perpendicular to the axis. In practice, the dentist may apply force to the elevator 200 in different directions depending on the position of the tooth and the need for tooth manipulation, causing the elevator 200 to deflect to a certain extent. The elliptical cross-section can accommodate this deflection without immediately hindering the movement of the elevator 200, thus increasing the flexibility of the operation. Although it allows for some deflection of the elevator 200, the elliptical cross-section still provides a relatively stable reset path for the elevator 200. After the operation is completed, under the reset force of the first elastic element 330, the elevator 200 can stably return to its initial position along the contour of the elliptical cross-section, ensuring the stability of the elevator 200 during the reset process and avoiding further displacement or damage due to unstable reset.

[0078] To enable the tappet 200 to be rotatably mounted on the mounting base 120, such as Figure 3 As shown, in one embodiment, a rotating shaft 210 is fixedly mounted on the push rod 200, and the rotating shaft 210 is rotatably mounted in the mounting elongated hole 121.

[0079] like Figure 3 As shown, in one embodiment, the rotating shaft 210 has an elliptical cross-section in a direction perpendicular to the axis. The elliptical outer peripheral surface of the rotating shaft 210 is adapted to the elliptical inner peripheral surface of the mounting elongated hole 121.

[0080] Both the rotating shaft 210 and the mounting elongated hole 121 have elliptical cross-sections and are mutually compatible. This design provides precise directional constraints for the rotation of the tappet 200. The special shape of the elliptical cross-section means that the tappet 200 can only rotate and make a certain degree of offset adjustment along a specific elliptical trajectory, avoiding unnecessary directional movements such as lateral swaying or irregular swinging during operation. This ensures the stability and accuracy of the tappet 200's movement and improves the precision of the prying operation.

[0081] like Figure 3 As shown, in one embodiment, the first meshing tooth 310 includes a plate portion 311 and a tooth portion 312. The plate portion 311 is fixedly mounted on the mounting base 120, and the tooth portion 312 is fixedly mounted on the plate portion 311. The number of tooth portions 312 is at least three.

[0082] For example, three toothed portions 312 are provided, and there are two meshing positions between the three toothed portions 312. The second meshing tooth 320 can mesh with the two meshing positions one after the other. Therefore, the force limiting component 300 can limit the force on the tooth elevator twice.

[0083] In another embodiment, four toothed portions 312 are provided, and there are three meshing positions between the four toothed portions 312. If the second meshing tooth 320 is initially engaged in the middle meshing position, the force limiting component 300 can limit the force on the elevator in both the forward and reverse rotation directions, and can limit the force twice.

[0084] Of course, in other embodiments, the toothed portion 312 may also be provided in five, six, or seven, etc.

[0085] Unlike the technical solution in the above embodiments where the force limiting component 300 includes a first meshing tooth 310, a second meshing tooth 320, and a first elastic element 330, such as... Figure 7 and Figure 8 As shown, in one embodiment, the force limiting component 300 includes a third engaging tooth 410, a locking arm 420, and a second elastic member 430.

[0086] The third meshing tooth 410 is fixedly installed on the tappet 200 at one end near the mounting base 120. Exemplarily, the third meshing tooth 410 is fixedly installed on the mounting end of the tappet 200 by means of welding, snap-fitting, bolting, or integral molding.

[0087] like Figure 8 As shown, the clamping arm 420 has two ends. One end of the clamping arm 420 is hinged to the mounting base 120, and the other end of the clamping arm 420 can rotate around one end of the clamping arm 420 and has a clamping position and a sliding position.

[0088] When in the locked position, the other end of the locking arm 420 engages with the third engagement tooth 410 to prevent the third engagement tooth 410 and the push rod 200 from rotating on the mounting base 120.

[0089] The second elastic element 430 pushes the other end of the locking arm 420 to rotate toward the blocking position or has a tendency to rotate. When the torque between the push rod 200 and the mounting base 120 is greater than the second preset torque, the third meshing tooth 410 pushes the other end of the locking arm 420 to switch to the sliding position, and the third meshing tooth 410 and the push rod 200 can rotate relative to the mounting base 120.

[0090] The elastic force of the second elastic element 430 is positively correlated with the magnitude of the second preset torque. For example, the greater the elastic force of the second elastic element 430, the greater the second preset torque; the smaller the elastic force of the second elastic element 430, the smaller the second preset torque.

[0091] For example, the second elastic element 430 includes, but is not limited to: helical spring, wave spring, butterfly spring, leaf spring, steel leaf spring, rubber spring, air spring, etc.

[0092] In one embodiment, the number of third meshing teeth 410 is at least three.

[0093] For example, three third meshing teeth 410 are provided, and there are two meshing positions between the three third meshing teeth 410. The clasp arm 420 can mesh with the two meshing positions one after the other. Therefore, the force limiting component 300 can limit the force on the tooth elevator twice.

[0094] In another embodiment, four third meshing teeth 410 are provided, and there are three meshing positions between the four third meshing teeth 410. If the locking arm 420 is initially engaged in the middle meshing position, the force limiting component 300 can limit the force on the elevator in both the forward and reverse rotation directions, and can limit the force twice.

[0095] Of course, in other embodiments, the third meshing teeth 410 may also be provided in five, six, or seven, etc.

[0096] like Figure 2 As shown, in one embodiment, the grip 110 is hollowed out.

[0097] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0098] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A force-limiting dental elevator, characterized in that, include: A handle (100) includes a grip (110) and a mounting base (120), the grip (110) and the mounting base (120) being fixedly connected; A push rod (200) is rotatably mounted on the mounting base (120) and is capable of reciprocating on the mounting base (120); Force limiting component (300) is mounted on the mounting base (120). In the rotation direction of the push rod (200), the force limiting component (300) enables the handle (100) and the push rod (200) to be connected in a transmission manner. When the torque between the handle (100) and the push rod (200) is greater than a first preset torque, the force limiting component (300) disengages the transmission connection between the handle (100) and the push rod (200) in the rotation direction.

2. The force-limiting dental elevator according to claim 1, characterized in that, The mounting base (120) is provided with an elongated mounting hole (121), and the push rod (200) is rotatably mounted in the elongated mounting hole (121) of the mounting base (120) and can slide along the length direction of the elongated mounting hole (121); The force limiting component (300) includes a first meshing tooth (310), a second meshing tooth (320), and a first elastic element (330). The first meshing tooth (310) is mounted on the mounting base (120), and the second meshing tooth (320) is mounted on the tappet (200). The push rod (200) has an engaging position and a stress-relieving position in the mounting elongated hole (121). When the push rod (200) is in the engaging position, the second engaging tooth (320) is driven to engage with the first engaging tooth (310) so that the mounting base (120) and the push rod (200) are driven to engage. When the push rod (200) is in the unloading position, the second meshing tooth (320) disengages from the first meshing tooth (310), and the push rod (200) can swing back and forth relative to the mounting base (120); The first elastic element (330) pushes the push rod (200) to move and switches the push rod to the engagement position. The magnitude of the elastic force of the first elastic element (330) is positively correlated with the magnitude of the first preset torque.

3. The force-limiting dental elevator according to claim 2, characterized in that, The mounting hole (121) of the mounting base (120) has a spring hole (122) on its wall. One end of the first elastic member (330) is installed in the spring hole (122), and the other end of the first elastic member (330) extends out of the spring hole (122) and can push the push rod (200).

4. The force-limiting dental elevator according to claim 3, characterized in that, The spring hole (122) is a through hole; The force-limiting toothed elevator also includes an adjusting block (130), which is threaded into the inner wall of the spring hole (122). The adjusting block (130) can move axially during rotation and pushes one end of the first elastic element (330) by moving axially.

5. The force-limiting dental elevator according to claim 2, characterized in that, The mounting elongated hole (121) has an elliptical cross section along the direction perpendicular to the axis.

6. The force-limiting dental elevator according to claim 5, characterized in that, A rotating shaft (210) is fixedly installed on the push rod (200), and the rotating shaft (210) is rotatably installed in the mounting elongated hole (121).

7. The force-limiting dental elevator according to claim 6, characterized in that, The rotating shaft (210) has an elliptical cross section in the direction perpendicular to the axis.

8. The force-limiting dental elevator according to claim 2, characterized in that, The first meshing tooth (310) includes a plate body (311) and a tooth body (312). The plate body (311) is fixedly mounted on the mounting base (120), and the tooth body (312) is fixedly mounted on the plate body (311). The number of tooth bodies (312) is at least three.

9. The force-limiting dental elevator according to claim 1, characterized in that, The force limiting component (300) includes a third meshing tooth (410), a locking arm (420), and a second elastic element (430). The third meshing tooth (410) is fixedly installed on the push rod (200) at one end near the mounting base (120); The locking arm (420) has two ends. One end of the locking arm (420) is hinged to the mounting base (120). The other end of the locking arm (420) can rotate around one end of the locking arm (420) and has a locking position and a sliding position. In the locking position, the other end of the locking arm (420) engages with the third meshing tooth (410) to prevent the third meshing tooth (410) and the push rod (200) from rotating on the mounting base (120). The second elastic element (430) pushes the other end of the locking arm (420) to rotate toward the locking position or has a tendency to rotate. When the torque between the push rod (200) and the mounting base (120) is greater than the second preset torque, the third meshing tooth (410) pushes the other end of the locking arm (420) to switch to the sliding position. The third meshing tooth (410) and the push rod (200) can rotate relative to the mounting base (120). The elastic force of the second elastic element (430) is positively correlated with the magnitude of the second preset torque.

10. The force-limiting dental elevator according to claim 9, characterized in that, The number of the third meshing teeth (410) is at least three.

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