阅读说明：本技术 一种拔牙挺 (Tooth extraction elevator ) 是由 余礼建 陆树鹏 于 2021-09-08 设计创作，主要内容包括：本发明涉及一种拔牙挺,包括驱动组件、转化组件、传递组件以及拔牙挺针。所述驱动组件在电力驱动下产生旋转运动,所述转化组件将所述驱动组件产生的旋转运动转化为高频直线往复运动。所述传递组件与所述转化组件连接,将所述高频直线往复运动传递至所述拔牙挺针,所述拔牙挺针将高频振动的作用力作用至牙龈,使牙周膜断裂。本发明的拔牙挺在电力驱动下能够产生较为稳定的旋转运动,通过驱动组件、转化组件以及传递组件的配合,能够输出较为稳定的直线往复运动,施加在牙周膜上的作用力也会比较均匀,且该作用力不会随着拔牙挺使用状态和使用时间而发生改变。此外,本发明的拔牙挺,驱动组件由电力驱动,产生的噪声较小,能够提高使用舒适性。(The invention relates to a dental elevator which comprises a driving component, a conversion component, a transmission component and an elevator needle. The driving assembly generates rotary motion under the drive of electric power, and the conversion assembly converts the rotary motion generated by the driving assembly into high-frequency linear reciprocating motion. The transmission component is connected with the conversion component and transmits the high-frequency linear reciprocating motion to the tooth extraction tappet needle, and the tooth extraction tappet needle acts the acting force of high-frequency vibration on the gum to break the periodontal ligament. The dental elevator can generate stable rotary motion under the drive of electric power, can output stable linear reciprocating motion through the matching of the drive component, the conversion component and the transmission component, has uniform acting force applied to the periodontal ligament, and can not change along with the use state and the use time of the dental elevator. In addition, the driving assembly of the dental elevator is driven by electric power, so that the generated noise is low, and the use comfort can be improved.)

1. A dental elevator, which is characterized by comprising a driving component, a conversion component, a transmission component and an elevator needle (8);

the driving assembly generates rotary motion under the drive of electric power;

the conversion assembly converts the rotary motion generated by the driving assembly into high-frequency linear reciprocating motion;

the transmission component is connected with the conversion component and transmits the high-frequency linear reciprocating motion to the tooth extraction tappet needle (8);

the tooth extraction straight needle (8) acts the acting force of high-frequency vibration on the gum to break the periodontal ligament.

2. The dental elevator according to claim 1, characterized in that the driving assembly comprises a motor (4) and a motor bracket (13) fixed at the front end of the motor (4);

the motor (4) is a servo motor.

3. The dental elevator according to claim 2, characterized in that the conversion assembly comprises a first ratchet (10) and a second ratchet (11) which are engaged with each other, and an elevator drive spring (1);

one end of the dental elevator driving spring (1) is attached to the motor support (13), and the other end of the dental elevator driving spring is attached to the second ratchet wheel (11);

a main shaft (42) of the servo motor sequentially penetrates through the motor support (13), the dental elevator driving spring (1), the second ratchet wheel (11) and the first ratchet wheel (10) and is fixed with the first ratchet wheel (10);

the main shaft (42) rotates to drive the first ratchet wheel (10) to rotate synchronously, the second ratchet wheel (11) is meshed with the first ratchet wheel (10), and under the rotating action of the first ratchet wheel (10), the second ratchet wheel (11) reciprocates along the direction of the main shaft (42) of the motor;

the dental elevator driving spring (1) is continuously compressed and released along with the reciprocating motion of the second ratchet wheel (11).

4. The dental elevator according to claim 3, characterized in that said transmission component is an impact block (12); the impact block (12) is sleeved outside the first ratchet wheel (10) and the second ratchet wheel (11) and is connected with the second ratchet wheel (11);

the impact block (12) is driven by the reciprocating motion of the second ratchet wheel (11) to transmit the acting force of high-frequency vibration to the tooth extraction tappet (8);

and a guide sleeve (14) is arranged outside the impact block (12), and the guide sleeve (14) is partially embedded into the motor bracket (13).

5. The dental elevator according to claim 2, further comprising a housing assembly;

the shell assembly comprises a second shell (15), a first shell (5), a rear cover (6) and a power interface (7);

the first shell (5) is arranged outside the motor (4), and the motor bracket (13) is connected with the first shell (5) and partially extends out of the first shell (5);

the second shell (15) is sleeved outside the motor support (13) and connected with the motor support (13), and the second shell (15) and the first shell (5) cover and wrap the motor support (13);

the needle point of the tooth extraction needle jack (8) is taken as the front end, and the rear cover (6) is arranged at the rear end of the motor (4) and is connected with the first shell (5);

the power interface (7) is connected with the rear end of the motor (4) and penetrates through the rear cover (6) to be connected with an external power supply.

6. The dental elevator according to claim 5, further comprising a securing assembly;

the tooth extraction tappet (8) is connected with the second shell (15) through the fixing component;

the fixing component comprises a connector (16) and a limiting and adjusting component, the tooth extraction tappet (8) is movably connected with the connector (16) through the limiting and adjusting component, and the rear end of the connector (16) is sleeved inside the second shell (15);

the limiting adjusting assembly comprises a positioning block (18) and a third steel ball (23);

a positioning groove (31) is formed in the connector (16), and the positioning groove (31) is clamped with the positioning block (18); and a third steel ball hole (26) is formed in the connector (16), and the third steel ball (23) is clamped in the third steel ball hole (26).

7. The dental elevator according to claim 6, characterized in that the dental elevator needle (8) is provided with a first sliding groove (28) and a second sliding groove (29), the first sliding groove (28) is attached to the positioning block (18), and the second sliding groove (29) is attached to the third steel ball (23);

the width of the first sliding groove (28) is larger than that of the positioning block (18), and the width of the second sliding groove (29) is larger than the diameter of the third steel ball (23).

8. The dental elevator according to any of claims 6 or 7, characterized in that the limit adjustment assembly further comprises a movable sleeve (19) and an elevator movable sleeve spring (3);

the movable sleeve (19) comprises an inner ring with a smaller diameter and an outer ring with a larger diameter, and the inner ring and the outer ring are integrally formed;

the inner part of the outer ring is of a taper structure and a circular ring structure, the diameter of the circular ring structure is consistent with the minimum diameter of the taper, one side of the circular ring structure facing the motor (4) is of a smaller taper, and one side of the circular ring structure facing the needle point of the tooth extraction needle jack (8) is of a larger taper; the minimum diameter of the outer ring is smaller than the diameter of the inner ring;

the dental elevator movable sleeve spring (3) is sleeved outside the rear end of the connector (16) and sleeved inside the inner ring;

the movable sleeve (19) is sleeved on the outer side of the connector (16), the inner ring is clamped in the second shell (15) and can axially move along the second shell (15) to clamp or release the third steel balls (23).

9. The dental elevator according to claim 6, further comprising a cushioning component,

the buffer component comprises a dental tappet positioning block spring (2) and a buffer cushion block (17);

the dental elevator positioning block (18), the spring (2) and the buffer cushion block (17) are arranged inside the connector (16) and are located at the rear end of the connector (16), the buffer cushion block (17) is sleeved at the rear end of the dental elevator needle (8), and the dental elevator needle (8) can move axially along the buffer cushion block (17);

one end of the dental tappet positioning block spring (2) is sleeved on the outer side of the guide sleeve (14), and the other end of the dental tappet positioning block spring is fast attached to the cushion pad, so that the cushion pad block (17) is fixed.

10. The dental elevator according to claim 5, further comprising an anti-slip assembly, said anti-slip assembly comprising a first steel ball (21) and a second steel ball (22);

a steel ball groove (30) is formed in the motor support (13), a first steel ball hole (24) is formed in the rear end of the guide sleeve (14), and the first steel ball (21) is clamped with the steel ball groove (30) through the first steel ball hole (24);

and a second steel ball hole (25) is formed in the front end of the guide sleeve (14), and the second steel ball (22) is clamped with the second shell (15) and the impact block (12) through the second steel ball hole (25) respectively.

Technical Field

The invention belongs to the technical field of oral medical instruments, and particularly relates to a dental elevator.

Background

The tooth extracting tappet is a tool for tooth extraction, and is inserted into a periodontal membrane between a tooth and an alveolar bone to generate high-frequency vibration in the tooth extracting process, and the periodontal membrane is continuously applied with acting force to cut off the periodontal membrane and pry and loosen the tooth, so that the purpose of tooth extraction is achieved.

In the prior art, most of dental extraction appliances are operated manually or pneumatically under the action of gas pressure. Artificial bare-handed dental elevator can only control the force subjectively by the operator. The pneumatic dental elevator is pushed by the gas pressure to apply pressure to the periodontal ligament, and after the gas is pushed out of the dental elevator, the action force disappears, and then the gas pushing-gas discharging operation is repeated to cut off the periodontal ligament. However, the force of the elevator on the periodontal ligament needs to be precisely controlled to achieve a smooth extraction. If the acting force is too small, the dental elevator can not be inserted into the periodontal ligament to pry and loosen the tooth. If the force is excessive, the elevator may penetrate into the adjacent tissue of the periodontal ligament, causing pain and unnecessary trauma to the patient.

In the prior art, both bare-handed operation and pneumatic type dental elevator extraction have the problem that the force cannot be accurately controlled, so that potential safety hazards exist. In addition, the pneumatic dental elevator generates larger noise during the use process.

Accordingly, there is a need to provide a dental elevator that is stable in force and less noisy.

Disclosure of Invention

Technical problem to be solved

The invention provides a dental elevator, aiming at solving the problems of unstable acting force and high noise of the dental elevator in the prior art.

(II) technical scheme

In order to achieve the purpose, the invention adopts the main technical scheme that:

a dental extraction tappet comprises a driving component, a conversion component, a transmission component and a dental extraction tappet needle;

the driving assembly generates rotary motion under the drive of electric power;

the conversion assembly converts the rotary motion generated by the driving assembly into high-frequency linear reciprocating motion;

the transmission assembly is connected with the conversion assembly and transmits the high-frequency linear reciprocating motion to the tooth extraction needle jack;

the tooth extraction needle applies the acting force of high-frequency vibration to the gum to break the periodontal ligament.

The dental elevator comprises a dental elevator, a driving assembly and a motor bracket, wherein the dental elevator comprises the dental elevator and a dental elevator shaft;

the motor is a servo motor.

The dental elevator as described above, preferably, the conversion assembly comprises first and second ratchet wheels engaged with each other, and an elevator driving spring;

one end of the dental elevator driving spring is attached to the motor support, and the other end of the dental elevator driving spring is attached to the second ratchet wheel;

a main shaft of the servo motor sequentially penetrates through the motor support, the tooth elevator driving spring, the second ratchet wheel and the first ratchet wheel and is fixed with the first ratchet wheel;

the main shaft rotates to drive the first ratchet wheel to rotate synchronously, the second ratchet wheel is meshed with the first ratchet wheel, and under the rotation action of the first ratchet wheel, the second ratchet wheel reciprocates along the direction of the main shaft of the motor;

the dental elevator driving spring is continuously compressed and released along with the reciprocating motion of the second ratchet wheel.

The dental elevator as described above, preferably, the transmission assembly is an impact block; the impact block is sleeved outside the first ratchet wheel and the second ratchet wheel and is connected with the second ratchet wheel;

the impact block is driven by the reciprocating motion of the second ratchet wheel to transmit the acting force of high-frequency vibration to the tooth extraction tappet;

and a guide sleeve is arranged outside the impact block, and the guide sleeve is partially embedded into the motor support.

A dental elevator as described above, preferably further comprising a housing assembly;

the shell assembly comprises a second shell, a first shell, a rear cover and a power interface;

the first shell is arranged outside the motor, and the motor bracket is connected with the first shell and partially extends out of the first shell;

the second shell is sleeved outside the motor support and connected with the motor support, and the second shell and the first shell cover and wrap the motor support;

the needle tip of the tooth extraction needle jack is used as the front end, and the rear cover is arranged at the rear end of the motor and connected with the first shell;

the power interface is connected with the rear end of the motor and penetrates through the rear cover to be connected with an external power supply.

The dental elevator as described above, preferably further comprising a securing assembly;

the tooth extraction tappet is connected with the second shell through the fixing component;

the tooth extraction tappet is movably connected with the connector through the limiting adjusting assembly, and the rear end of the connector is sleeved inside the second shell;

the limiting adjusting assembly comprises a positioning block and a third steel ball;

the connector is provided with a positioning groove, and the positioning groove is clamped with the positioning block; and a third steel ball hole is formed in the connector, and the third steel ball is clamped in the third steel ball hole.

In the dental elevator, preferably, the dental elevator needle is provided with a first sliding groove and a second sliding groove, the first sliding groove is attached to the positioning block, and the second sliding groove is attached to the third steel ball;

the width of the first sliding groove is larger than that of the positioning block, and the width of the second sliding groove is larger than the diameter of the third steel ball.

The dental elevator as described above, preferably, the limit adjusting assembly further comprises a movable sleeve and an elevator movable sleeve spring;

the movable sleeve comprises an inner ring with a smaller diameter and an outer ring with a larger diameter, and the inner ring and the outer ring are integrally formed;

the inner part of the outer ring is of a taper structure and a circular ring structure, the diameter of the circular ring structure is consistent with the minimum diameter of the taper, one side of the circular ring structure facing the motor is of a smaller taper, and one side of the circular ring structure facing the needle point of the tooth extraction needle jack is of a larger taper; the minimum diameter of the outer ring is smaller than the diameter of the inner ring;

the movable tooth support sleeve is sleeved outside the rear end of the connector and sleeved inside the inner ring;

the movable sleeve is sleeved outside the connector, and the inner ring is clamped inside the second shell and can axially move along the second shell to clamp or release the third steel balls.

As discussed above, the dental elevator preferably further comprises a cushioning assembly,

the buffer component comprises a dental elevator positioning block spring and a buffer cushion block;

the dental elevator positioning block spring and the buffer cushion block are arranged inside the connector and positioned at the rear end of the connector, the buffer cushion block is sleeved at the rear end of the dental elevator needle, and the dental elevator needle can move axially along the buffer cushion block;

one end of the spring of the dental elevator positioning block is sleeved outside the guide sleeve, and the other end of the spring of the dental elevator positioning block is fast attached to the cushion pad, so that the cushion pad is fixed.

The dental elevator as described above, preferably, the dental elevator further comprises an anti-slip component, wherein the anti-slip component comprises a first steel ball and a second steel ball;

the motor support is provided with a steel ball groove, the rear end of the guide sleeve is provided with a first steel ball hole, and the first steel ball is clamped with the steel ball groove through the first steel ball hole;

and a second steel ball hole is formed in the front end of the guide sleeve, and the second steel ball is clamped with the second shell and the impact block through the second steel ball hole respectively.

(III) advantageous effects

The invention has the beneficial effects that:

according to the tooth extraction tappet, the driving assembly generates rotary motion under the drive of electric power, the conversion assembly converts the rotary motion into high-frequency linear reciprocating motion, the high-frequency linear reciprocating motion is transmitted to the tooth extraction tappet needle through the transmission assembly, the tooth extraction tappet needle acts the acting force of high-frequency vibration on gingiva, periodontal membranes are broken, teeth are pried and loosened, and tooth extraction is carried out. The dental elevator can generate stable rotary motion under the drive of electric power, so that stable linear reciprocating motion can be converted, and acting force applied to periodontal ligament is uniform.

According to the invention, through the matching of the driving component, the conversion component and the transmission component, the high-frequency vibration of the dental extraction tappet needle in a stable state is realized, a relatively stable acting force is applied to a periodontal ligament, and the acting force cannot change along with the use state and the use time of the dental extraction tappet.

In addition, the driving assembly of the dental elevator is driven by electric power, so that the generated noise is low, and the comfort is improved.

Drawings

FIG. 1 is a schematic view of the overall structure of a dental elevator according to the present invention;

FIG. 2 is a schematic view of another perspective of the dental elevator according to the present invention;

FIG. 3 is a left side view of FIG. 1;

FIG. 4 is a detailed exploded view of the dental elevator of the present invention;

FIG. 5 is a simplified exploded view of a dental elevator according to the present invention;

FIG. 6 is a detailed exploded view of another angle of the dental elevator of the present invention;

FIG. 7 is a detailed exploded view of a further angle dental elevator of the present invention;

FIG. 8 is a cross-sectional view taken along A-A of FIG. 1;

FIG. 9 is an enlarged view of a portion of FIG. 8;

FIG. 10 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 11 is an enlarged view of a portion of FIG. 10;

FIG. 12 is a schematic view of the ratchet assembly of the present invention in a mated state;

FIG. 13 is a schematic view of a first ratchet according to the present invention;

FIG. 14 is a schematic view of a second ratchet according to the present invention.

[ description of reference ]

1: a stile drive spring; 2: a positioning block spring of the dental elevator; 3: a spring for a movable sleeve of the dental elevator; 4: a motor; 5: a first housing; 6: a rear cover; 7: a power interface; 8: straightening the teeth; 9: positioning a pin; 10: a first ratchet wheel; 11: a second ratchet wheel; 12: an impact block; 13: a motor bracket; 14: a guide sleeve; 15: a second housing; 16: a connector; 17: buffering cushion blocks; 18: positioning blocks; 19: a movable sleeve; 20: a screw;

21: a first steel ball; 22: a second steel ball; 23: a third steel ball;

24: a first steel bead hole; 25: a second steel ball hole; 26: a third steel ball hole;

27: a pin hole; 28: a first sliding groove; 29: a second sliding groove;

30: a steel bead groove; 31: positioning a groove; 41: a coupling; 42: a main shaft;

81: a support section; 82: and loading the section.

Detailed Description

For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.

Referring to fig. 1-14, the present embodiment provides a dental elevator comprising a drive assembly, a conversion assembly, a transmission assembly, and an elevator needle 8.

The driving assembly generates rotary motion under the drive of electric power, the conversion assembly converts the rotary motion generated by the driving assembly into high-frequency linear reciprocating motion, and the transmission assembly is connected with the conversion assembly and transmits the high-frequency linear reciprocating motion to the tooth extraction needle 8. The tooth extraction needle 8 acts the acting force of the high-frequency vibration on the gum, so that the periodontal ligament is broken, the teeth are pried and loosened, and the purpose of tooth extraction is achieved.

Specifically, the driving component in the present embodiment is a motor 4, and preferably, the motor 4 is a servo motor. The servo motor is driven by electric power, and the rotational speed is comparatively stable, and consequently the rotary motion who produces is comparatively stable, and the high frequency straight reciprocating motion that the conversion obtained and the effort of transmitting to tooth extraction tappet 8 are comparatively even, can not change along with tooth extraction tappet user state and live time. In addition, the dental elevator in the embodiment can control the acting force on the periodontal ligament within a reasonable range by controlling the rotating speed of the servo motor. In addition, the noise generated by the servo motor driven by the electric power is small, and the experience of the patient is safer and more comfortable.

In this embodiment, the direction of the needle tip of the tooth lifter 8 is defined as the front end, and the direction of the motor 4 is defined as the rear end. Since the main shaft 42 is continuously rotated during the operation of the motor 4, the conversion assembly cannot be directly connected to the motor 4. Therefore, in the present embodiment, the motor bracket 13 is disposed at the front end of the motor 4, as shown in fig. 3, the motor bracket 13 is fixedly connected to the coupler 41 of the servo motor through 3 screws 20, and the diameter of the screw 20 is 3 mm. A through hole is formed in the middle of the motor support 13 so that the main shaft 42 of the servo motor can pass through the through hole.

Preferably, as shown in fig. 4, the conversion assembly includes a first ratchet 10 and a second ratchet 11 engaged with each other, and a tappet drive spring 1. One end of the dental elevator driving spring 1 is attached to the motor support 13, and the other end of the dental elevator driving spring is attached to the second ratchet wheel 11.

A main shaft 42 of the servo motor sequentially passes through the motor bracket 13, the tappet driving spring 1, the second ratchet wheel 11 and the first ratchet wheel 10 and is fixed with the first ratchet wheel 10. The first ratchet wheel 10 is provided with a pin hole 27, and the first ratchet wheel 10 is fixed at the front end of a main shaft 42 of the servo motor through a positioning pin top 9.

Through the connection between the ratchet set and the motor spindle 42, when the spindle 42 is powered on and rotates, the first ratchet 10 can be driven to rotate synchronously. The second ratchet wheel 11 is engaged with the first ratchet wheel 10, when the first ratchet wheel 10 rotates synchronously with the servo motor, because the second ratchet wheel 11 is not fixed, under the rotation action of the first ratchet wheel 10, the gear of the second ratchet wheel 11 continuously rotates in a transposition mode, and meanwhile, the second ratchet wheel 11 also reciprocates along the direction of the motor spindle 42.

Both ends of the tappet driving spring 1 are not fixed, and thus can be continuously compressed and released along with the high-frequency reciprocating motion of the second ratchet wheel 11 in the axial direction.

In this embodiment, it is specified that the direction of the motor spindle 42 is an axial direction, and the radius of the cross section of the ratchet wheel is a radial direction.

Referring to fig. 12 to 14, the first ratchet 10 and the second ratchet 11 in this embodiment each include 6 gears, and can rotate at a high speed under the rotation of the servo motor, and the gears rotate and switch fast to drive the transmission assembly to perform a fast linear reciprocating motion, so as to achieve a high-frequency vibration of the dental elevator.

Preferably, the transmission component in this embodiment is an impact block 12, which functions to transmit a high frequency reciprocating motion to the tooth lifter. Referring to fig. 8-11, the impact block 12 is sleeved outside the first ratchet 10 and the second ratchet 11, the inner side of the rear end of the impact block 12 is provided with an internal thread, the outer side of the second ratchet 11 is provided with an external thread, and the impact block 12 is in threaded connection with the second ratchet 11. The impact block 12 is driven by the reciprocating motion of the second ratchet wheel 11 to synchronously perform high-frequency linear reciprocating motion, and the acting force of high-frequency vibration is transmitted to the tooth extraction needle lifter 8.

Preferably, the dental elevator of the present embodiment further comprises a housing assembly. Referring to fig. 5, the case assembly includes a second housing 15, a first housing 5, a rear cover 6, and a power interface 7. First shell 5 sets up in the outside of motor 4, and the front end inboard of first shell 5 sets up the internal thread, sets up the external screw thread on the motor support 13, motor support 13 and first shell 5 threaded connection. Furthermore, the motor bracket 13 partially protrudes out of the first housing 5.

The second housing 15 is sleeved outside the motor support 13, and the inner side of the rear end of the second housing 15 is provided with an internal thread which is in threaded connection with the motor support 13. The rear end face of the second shell 15 is attached to the front end face of the first shell 5, and the motor support 13 is covered and wrapped together.

A rear cover 6 is provided at the rear end of the motor 4 as a protector, and similarly, the rear end of the first housing 5 is provided with an internal thread to be screwed with the rear cover 6. The power interface 7 is connected with the rear end of the motor 4 and passes through the through hole on the rear cover 6 to be connected with an external power supply. The motor 4 is driven by the connection of the power interface 7 and an external power supply.

Preferably, the dental elevator in this embodiment further comprises a fixing member for connecting the elevator needle 8 and the second housing 15.

Specifically, referring to fig. 6-11, the securing assembly includes a connector 16 and a spacing adjustment assembly. Tooth extraction needle 8 is movably connected with connector 16 through a limiting adjusting component, the rear end of connector 16 is provided with an external thread, the front end of second shell 15 is internally provided with an external thread, and connector 16 is in threaded connection with second shell 15. In this embodiment, the tooth extraction needle is long, and on one hand, the tooth extraction needle needs to be connected with the impact block and the motor part to ensure that the high-frequency linear reciprocating motion of the impact block 12 can be transmitted to the tooth extraction needle 8. On the other hand, in order to prevent the extraction needle from swaying left and right during use, the extraction needle 8 is fixed by the connector 16 having a certain length, and the extraction needle 8 is sleeved in the connector 16 and fixedly connected to the second housing by the thread.

Further, the limiting and adjusting assembly comprises a positioning block 18 and a third steel ball 23. Referring to fig. 6-7, the positioning groove 31 is formed in the connector 16, the positioning block 18 is engaged with the positioning groove 31, and at the same time, the first sliding groove 28 is formed in the tooth extraction tappet 8, the first sliding groove 28 has a certain stroke, and the positioning block 18 is engaged with the positioning groove 31, so that the axial movement distance of the tooth extraction tappet 8 can be limited. The stopper 18 is an arc-shaped table body, and after the stopper is clamped with the positioning groove 31, the connector 16 keeps a complete annular cross section. On the other hand, in order to prevent the tooth extraction needle lifter 8 from slipping along the radial rotation during the working process, the connector 16 of the embodiment is further provided with a third steel ball hole 26, the third steel ball 23 is clamped in the third steel ball hole 26, the tooth extraction needle lifter 8 is further provided with a second sliding groove 29, the second sliding groove 29 is attached to the third steel ball 23, and then the positioning block 18 and the third steel ball 23 are coated and fixed, so that the limiting effect of the positioning block 18 and the third steel ball 23 is realized.

In order to ensure that the tooth extraction tappet 8 has a certain stroke range along the axial direction, the width of the first sliding groove 28 is greater than that of the positioning block 18 in the embodiment, and the width of the second sliding groove 29 is greater than the diameter of the third steel ball 23. The above "width" refers to a distance in the axial direction of the positioning block 18, the first slide groove 28, and the second slide groove 29.

Further, the limit adjusting assembly further comprises a movable sleeve 19 and a tooth elevator movable sleeve spring 3. In this embodiment, the movable sleeve 19 and the spring 3 of the movable sleeve of the dental elevator are sleeved outside the connector 16 and can perform a certain range of telescopic motion along the axial direction, so as to adjust the limiting block 18 and the third steel ball 23 to achieve an expected limiting effect, thereby realizing the limiting fixation and the extraction of the dental elevator.

Specifically, referring to fig. 6-11, the swivel sleeve 19 includes an inner ring having a smaller diameter and an outer ring having a larger diameter, which are integrally formed. Specifically, the inner ring refers to the portion of the movable sleeve 19 facing the motor 4, and the outer ring refers to the portion of the movable sleeve 19 facing the tip of the tooth extraction tappet.

Referring to fig. 9 to 11, the inner portion of the outer ring has a taper structure and a circular ring structure, the diameter of the circular ring structure is the same as the minimum diameter of the taper, and the side facing the motor 4 has a smaller taper and the side facing the needle tip of the tooth extraction needle 8 has a larger taper. To ensure that the movable sleeve 19 can perform a telescopic movement in the axial direction, the minimum diameter of the outer ring needs to be smaller than the diameter of the inner ring.

The elevator movable sleeve spring 3 is sleeved outside the rear end of the connector 16 and is sleeved inside the inner ring. The movable sleeve 19 is sleeved on the outer side of the connector 16, the inner ring is clamped in the second shell 15 and is not in axial contact with the second shell 15, and under the action of the spring 3 of the movable sleeve of the tooth lifter, the movable sleeve 19 can move axially along the second shell 15 to clamp or release the third steel ball 23.

When the tooth extraction tappet is in a static state or a working state, the tooth extraction movable sleeve spring 3 is in a normal position, the movable sleeve 19 is pushed to the front end to ensure that the taper structure is clamped with the connector 16, the limiting block 18 and the third steel ball 23 are ensured to have a good limiting effect on the tooth extraction tappet 8, and the tooth extraction tappet 8 is prevented from rotating and excessively moving along the axis to slide out of the connector 16.

When the work of extracing tooth finishes, the doctor can hand the outside of movable sleeve 19, promote movable sleeve 19 to the rear end, because the inner ring of movable sleeve has certain distance with the axial terminal surface of second shell 15, therefore, at the in-process of the compression of the mobile sleeve spring 3 of dental elevator, movable sleeve 19 has certain stroke, can follow the axial and move certain distance to the rear end, the tapering structure loses the joint effect to the connector, stopper 18 and third steel ball 23 lose the limiting displacement to the tappet needle 8 of extracing tooth, can take out the tappet needle 8 of extracing tooth, wash disinfection etc.. The installation and the removal process of the tooth extraction tappet 8 are opposite and are not described in detail.

Preferably, the outside of the impact block 12 is provided with a guide sleeve 14, and the guide sleeve 14 is partially embedded in the motor bracket 13. The guide sleeve 14 is sleeved outside the impact block 12, the ratchet wheel set and the dental elevator driving spring 1 to ensure that the impact block 12 can generate reciprocating motion in the axial direction.

Preferably, referring to fig. 9 and 11, the dental elevator further comprises a cushioning assembly. The buffer assembly is used for preventing the motor 4 from causing accidental injury to personnel when the motor is in no load. Specifically, the buffer assembly comprises a tappet positioning block spring 2 and a buffer cushion block 17. The tappet positioning block spring 2 and the cushion block 17 are arranged inside the connector 16 and are positioned at the rear end of the connector 16. The cushion pad 17 is sleeved at the rear end of the tooth extraction tappet 8, and the tooth extraction tappet 8 can move axially along the cushion pad 17. One end of the tappet positioning block spring 2 is sleeved outside the guide sleeve 14, and the other end of the tappet positioning block spring is quickly attached to the cushion pad, so that the cushion pad 17 is fixed.

In this embodiment, the cushion pad 17 has a certain thickness, and as long as the rear end surface of the tooth extraction needle 8 does not exceed the rear end surface of the cushion pad 17, the acting force of the impact block 12 cannot be transmitted to the tooth extraction needle and only impacts on the cushion pad 17. In this embodiment, the tappet positioning block spring 2 does not have a telescopic action, one end of the tappet positioning block spring abuts against the guide sleeve 14, and the other end of the tappet positioning block spring is attached to the cushion pad block 17, so that the cushion pad block 17 is ensured to be fixed in position and cannot slide randomly, and the cushion effect is lost.

This embodiment is in order to prevent when the motor from idling to transmit the effort to the tappet of extracing tooth, causes the accidental injury to the outward, through cushion 17 and tappet locating piece spring 2, guarantees to extract tooth tappet 8 and just can receive the effort of impact block after exceeding cushion 17 to the rear end displacement and carry out work.

Therefore, in the dental elevator of the present embodiment, only by placing the extraction needle 8 on the periodontal ligament and pressing down the operator to a certain extent, the extraction needle 8 moves to the rear end and exceeds the cushion pad 17, and the force of the reciprocating linear motion of the impact block 12 can be applied to the extraction needle 8, thereby achieving the effect of applying the force to the periodontal ligament. If the motor 4 idles, the tooth extraction needle can not be accidentally injured as long as the tooth extraction needle is not pressed to a certain degree, and the safety degree is higher.

Preferably, to prevent unwanted axial rotational slippage of the various components of the dental elevator, the dental elevator of this embodiment also includes an anti-slip assembly. Specifically, the anti-slip assembly includes a first steel ball 21 and a second steel ball 22. In addition, the third steel ball 23 is also a part of the anti-slip assembly, and is not described herein again.

Referring to fig. 6, a steel ball groove 30 is formed in the motor bracket 13, referring to fig. 7, a first steel ball hole 24 is formed in the rear end of the guide sleeve 14, and the first steel ball 21 is clamped with the steel ball groove 30 through the first steel ball hole 24 to prevent the guide sleeve 14 from rotating and slipping.

Referring to fig. 7, a second steel ball hole 25 is formed at the front end of the guide sleeve 14, and the second steel ball 22 is respectively clamped with the second housing 15 and the impact block 12 through the second steel ball hole 25, so as to ensure that the impact block 12 only makes a linear reciprocating motion along the axial direction and does not rotate and slide in the radial direction.

The tooth extraction tappet 8 comprises a supporting section 81 and a loading section 82, wherein the supporting section 81 is positioned at the front end of the loading section 82, and the supporting section 81 intersects with the axis of the loading section 82. As shown in fig. 5, the supporting section 81 is inserted into the gum as a fulcrum, the loading section 82 is coincident with the axis on which the motor 4 is located, and the loading section 82 applies a force of high frequency vibration to the supporting section 81. The supporting section 81 and the loading section 82 form a lever structure, the periodontal ligament is fractured by the action force of high-frequency vibration, and then the tooth is pulled out by the prying action of the supporting section in the lever structure.

The above embodiments are merely illustrative, and not restrictive, of the scope of the invention, and those skilled in the art will be able to make various changes and modifications within the scope of the appended claims without departing from the spirit of the invention.