CN211985746U

CN211985746U - Telescopic count root canal file

Info

Publication number: CN211985746U
Application number: CN201820810302.9U
Authority: CN
Inventors: 张德彬
Original assignee: Xuzhou Yunchuang Property Service Co Ltd
Current assignee: Tianjin Shangyuan Metal Surface Treatment Co ltd
Priority date: 2018-05-29
Filing date: 2018-05-29
Publication date: 2020-11-24
Anticipated expiration: 2028-05-29

Abstract

The utility model discloses a telescopic counting root canal file, which belongs to the dental medical appliance, the utility model comprises a telescopic handle, a counter is arranged on the handle; the upper end surface of the handle is provided with a hole, the inner side wall of the hole is provided with an annular groove, and the side wall of the annular groove is provided with a display hole; the counter includes: the character wheel on the ring channel is established to the cover, be provided with the digital sign on the lateral wall of character wheel, the up end fixedly connected with ratchet of character wheel, still including setting up the pawl device on the lateral wall in hole, the pawl device is connected with the ratchet, a through-hole has been seted up on the terminal surface of character wheel, the axis of through-hole and the axis collineation of character wheel, the through-hole endotheca is equipped with a ring, be provided with a chute on the inside wall of ring, the pot head in hole is equipped with the button, the button can be downthehole along the axis removal in hole, the bottom of button is connected with the connecting rod, be provided with an sloping block on the lateral wall of connecting rod, sloping. The utility model discloses can audio-visually read out root canal file's use number of times on the handle.

Description

Telescopic count root canal file

Technical Field

The utility model belongs to the dental medical instrument, concretely relates to a root canal file for treating root canal of molar.

Background

Endodontic and periapical diseases are common diseases in the stomatology department, preservation of the patient's teeth, pulp is the therapeutic objective of modern dentistry, and root canal therapy is currently the most common and effective treatment. The principle of endodontic surgery is to remove most of the infectious material in the root canal by mechanical and chemical means and to prevent the occurrence of periapical lesions or to promote the healing of already occurring periapical lesions by filling the root canal, closing the crown.

Root canal treatment generally comprises the following steps:

firstly, preparing a root canal: opening marrow, thoroughly clearing pulp tissues with pathological necrosis, measuring the length of the root canal, and enlarging the root canal;

secondly, flushing the root canal: repeatedly carrying out the operation in the root canal treatment, and washing infection sources such as tiny fragments of organic matters in the root canal, tiny powder of cut hard tissues and the like;

thirdly, disinfecting the root canal: the most common use of medicine disinfection is that cotton is dipped with a little liquid medicine and placed in the root canal, and the opening is sealed by a temporary sealing material;

fourthly, filling the root canal: is the last step of the root canal therapy and the most important step in the root canal therapy, and currently, the root canal filling agent and the gutta-percha point are commonly used to fill the root canal in the field, so that the root canal system can be tightly closed.

The length of the working part of the existing root canal file is 21, 25, 28 and 31mm, in the actual treatment work, because the opening and closing degree of the oral cavity of the human body is limited, and in order to ensure the treatment effect of the root canal, the length of the blade part can not be shortened, thereby causing the tooth to be very difficult when the oral cavity is treated by grinding teeth. In order to facilitate the root canal treatment of the molar, the prior art adopts a mode of shortening the handle of the root canal file (namely shortening the original handle with the length of 13mm into 10mm), so as to improve the convenience of the treatment of the molar and reduce the labor intensity of medical staff. However, shortening the length of the handle can cause inconvenience to the medical staff and even cause the accidents of dropping the root canal file.

For example, the utility model patent with the application number of 201220063983.X discloses a medical root canal file, which comprises a handle and a file needle, wherein the handle is fixedly connected with the file needle, and at least one integrally formed strip-shaped bulge is arranged on the outer circumference of the handle; the handle is also provided with a rope threading hole. Can connect the string on the wire rope handling hole, the other end bundle of string is on medical staff's wrist, though can effectively avoid the root canal file to drop, but does not overcome the problem that the handle is too short, and medical staff uses still not convenient.

Meanwhile, due to the high cost of the apparatus, repeated disinfection and use are required clinically, the service life of each nickel-titanium root canal apparatus is not more than 20 times on average according to the literature records, and the nickel-titanium root canal apparatus is broken in use due to fatigue in clinic. After the apparatus is broken, the apparatus is remained in the root canal, and part of the root canal is blocked and cannot be cleaned, so that a large amount of bacteria are remained, the treatment failure is easily caused, and the pain of a patient is increased. And there is not the root canal file of tally function among the prior art, and chinese utility model that bulletin number is CN205411376U discloses a root canal file frame with tally function, but the root canal file frame count is not directly perceived. Therefore, there is a need for a file that can be counted.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: in order to satisfy the functional requirement that root canal file needs the count among the prior art to and solve among the prior art root canal file length shorter, influence the problem that medical staff operated, provide a telescopic count root canal file.

The utility model adopts the technical scheme as follows:

a telescopic counting root canal file comprises a handle, wherein the handle is a telescopic handle, and a counter is arranged on the handle; the upper end face of the handle is provided with a hole, the inner side wall of the hole is provided with an annular groove, and the side wall of the annular groove is provided with a display hole; the counter includes: the cover is established character wheel on the ring channel, be provided with digital sign on the lateral wall of character wheel, the up end fixedly connected with ratchet of character wheel is still including setting up pawl device on the lateral wall in hole, pawl device with the ratchet is connected, a through-hole has been seted up on the terminal surface of character wheel, the axis of through-hole with the axis collineation of character wheel, the through-hole endotheca is equipped with a ring, be provided with a chute on the inside wall of ring, the pot head in hole is equipped with the button, the button can the axis in downthehole edge hole removes, the bottom of button is connected with the connecting rod, be provided with an sloping block on the lateral wall of connecting rod, sloping block with chute looks adaptation.

Further, the circular ring is arranged as an inner inclined gear ring; the inclined groove is the inner tooth on the inner inclined gear ring; the bottom of the connecting rod is sleeved with a bevel gear, the bevel block is external teeth on the bevel gear, and the bevel gear is meshed with the internal bevel gear ring.

Further, the thickness of the bevel gear is not greater than that of the inner bevel gear ring.

Furthermore, the side wall of the through hole and the outer side wall of the inner inclined gear ring are both provided with anti-skid grains.

Further, a plurality of semicircle orifices have been seted up to downthehole lateral wall front end along the axis direction in hole, the second locating hole has still been seted up on the inside wall top in hole, the downthehole fixedly connected with plastic meson of second locating hole, the button cover is established can follow in the plastic meson the axis in hole removes, the lateral wall rear end of button is provided with spring protrusion device, spring protrusion device with semicircle orifice adaptation, first locating hole has been seted up to the lateral wall rear end of button, be provided with wear pad in the first locating hole, wear pad's lateral wall with the inside wall sliding connection in hole.

Further, spring protruding device is including seting up mounting hole on the button lateral wall, be provided with the bobble in the mounting hole, semicircle orifice, mounting hole all with bobble looks adaptation, still be provided with little spring in the mounting hole, the bottom of little spring with the diapire of mounting hole is connected, the top of little spring with the bobble is connected.

Further, be provided with the ring seat on the lateral wall in hole, the below of button is provided with the spring, the upper end of spring with the lower terminal surface of button is connected, the bottom of spring with the up end of ring seat is connected.

Furthermore, the top of the button is provided with a safety rope hole, and a safety rope is arranged in the safety rope hole.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

1. the utility model discloses in, through setting up the handle into retractable, handle length is adjustable, and when medical staff carried out root canal preparation to patient's tooth, can select the length of handle according to the particular case of patient's oral cavity degree of opening and shutting, not only adapt to the degree of opening and shutting in patient's oral cavity, still with medical staff's operation hand looks adaptation to medical staff carries out root canal preparation. In the root canal preparation midway, the cutting part of root canal has got into in the root canal this moment, can stretch out the handle so that medical staff carries and draws or rotatory root canal file this moment, has greatly made things convenient for medical staff to operate the root canal file. The counter is arranged at the handle part of the root canal file, the counter can count the use times of the root canal file visually and conveniently and display the use times on the handle to prompt the service life of the root canal file of medical workers. The utility model discloses the structure is ingenious, and the count is convenient, uses number of times direct display on the handle, easily observes, because maloperation or root canal file place the circumstances such as the count confusion that the mistake brought when avoiding appearing counting on the root canal file frame among the prior art. The utility model discloses show the concrete structure of a counter simultaneously, because root canal file has strict use number of times restriction, generally speaking is no longer than 15, and some products require about 5 more, consequently, the utility model discloses in only a character wheel, be provided with digital mark on the lateral wall of character wheel, digital mark can come the customization according to the concrete life-span of concrete product. During the use, medical practitioner presses the button, the button drives the connecting rod and moves down in the lump, the stroke of button is fixed, consequently, the stroke of connecting rod downstream is also fixed, and the ring restraint does not take place to reciprocate in the ring channel, the sloping block slides along the orbit of chute in the chute this moment, the sloping block also moves down together with the connecting rod simultaneously, consequently in the sloping block downstream process, the sloping block will drive the chute rotation a fixed angle with it complex, and the lateral wall of ring passes through frictional force and drives character wheel rotation a fixed angle, character wheel pivoted angle is corresponding with the stroke of button, at this moment, the digital sign that observes from the display hole rotates an angle, count and add one. Reset after the button stroke finishes, at this moment, the button passes through the reverse upward movement of connecting rod drive sloping block, but because the character wheel rotates behind an angle and is blocked by the pawl device on the pore wall through the ratchet, the character wheel no longer follows the restoration and the antiport of button, and at this moment, only the ring antiport resets. For the next use, the medical practitioner presses the button again and the counter repeats the steps described above. This simple structure is reliable, the manipulation of being convenient for, and the count is convenient and reliable, is difficult for receiving external disturbance, because even finger touches the button in the root canal preparation, a stroke can not walked yet to the button, and the character wheel can not rotate a complete angle yet and is blocked by the pawl to the count can not change easily.

2. In the utility model, in order to increase the reliability of the counter, simultaneously improve the standardization degree of the utility model and reduce the production cost, the circular ring is arranged as an inner inclined gear ring; the inclined groove is the inner tooth on the inner inclined gear ring; the bottom of the connecting rod is sleeved with a bevel gear, the bevel block is external teeth on the bevel gear, and the bevel gear is meshed with the internal bevel gear ring.

3. The utility model discloses in, for the volume that reduces the counter for the mechanism of counter is compacter, the thickness of helical gear is not more than the thickness of interior skewed tooth ring.

4. The utility model discloses in, for the frictional force between oblique ring gear and the character wheel in the increase, the oblique ring gear of being convenient for drives the character wheel and rotates, all is provided with anti-skidding line on the lateral wall of interior oblique ring gear, through-hole.

5. The utility model discloses a concrete structure of telescopic handle, this telescopic handle pass through the tensioning effect of plastic meson, and the clearance is little when guaranteeing to stretch out and draw back. No slipping phenomenon occurs. Simultaneously, the wear-resisting piece through fixed mounting plays the effect of support, avoids button and pore wall relative wearing and tearing, hinders medical staff's operation, has greatly promoted medical staff's use and has felt.

6. The utility model discloses a concrete structure of spring protrusion device, this protrusion device simple structure is reliable, and the inside wall of fixed pipe is hugged closely in the effect of bobble to the bobble, and when the bobble removed the semicircle orifice, the bobble directly entered into the semicircle orifice, and the bobble was direct with button and pore wall locking this moment with the semicircle orifice, and the handle no longer extends this moment.

7. The utility model discloses in, be provided with the ring seat on the lateral wall in hole, the below of button is provided with the spring, and the upper end of spring is connected with the lower terminal surface of button, and the bottom of spring is connected with the up end according to the ring seat. The purpose is to facilitate button reset and to prevent touching the button during root canal preparation from causing the counter to count up by one.

8. The utility model discloses in, because root canal file's handle length only 10mm to 13mm, in order to prevent that root canal preparation in-process root canal file from dropping, be provided with the safety rope hole at the button top, be provided with the safety rope in the safety hole. When in use, the safety rope is tied on the wrist of a medical worker.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the counter mechanism of the present invention;

FIG. 3 is a view from the direction A of FIG. 2 (without bevel gears, connecting rods);

FIG. 4 is a schematic view of view I of FIG. 2;

FIG. 5 is a schematic view II of FIG. 4;

the labels in the figure are: 1-handle, 101-hole, 102-annular groove, 103-display hole, 104-second positioning hole, 105-plastic meson, 106-first positioning hole, 107-wear-resistant piece, 108-semicircular hole, 2-counter, 201-character wheel, 202-ratchet wheel, 203-pawl device, 204-inner bevel gear ring, 205-connecting rod, 206-button, 207-bevel gear, 208-spring, 209-snap ring, 3-spring protrusion device, 31-mounting hole, 32-small ball and 33-small spring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

A telescopic counting root canal file comprises a handle 1, wherein the handle 1 is a telescopic handle, and a counter 2 is arranged on the handle 1; a hole 101 is arranged on the upper end surface of the handle 1, an annular groove 102 is arranged on the inner side wall of the hole 101, and a display hole 103 is arranged on the side wall of the annular groove 102; the counter 2 includes: the character wheel 201 on the annular groove 102 is established to the cover, be provided with the digital sign on the lateral wall of character wheel 201, the up end fixedly connected with ratchet 202 of character wheel 201, still including setting up pawl device 203 on the lateral wall of hole 101, pawl device 203 is connected with ratchet 202, a through-hole has been seted up on the terminal surface of character wheel 201, the axis of through-hole and character wheel 201's axis collineation, the cover is equipped with a ring in the through-hole, be provided with a chute on the inside wall of ring, the pot head in hole is equipped with button 206, button 206 can move along the axis of hole 101 in hole 101, the bottom of button 206 is connected with connecting rod 205, be provided with an oblique piece on connecting rod 205's the lateral wall, oblique piece and chute looks adaptation.

Further, the circular ring is provided with an inner bevel gear ring 204; the chute is the inner teeth on the inner bevel gear ring 204; the bottom of the connecting rod 205 is sleeved with a bevel gear 207, a bevel block is external teeth on the bevel gear 207, and the bevel gear 207 is meshed with the internal bevel gear ring 204.

Further, the thickness of the helical gear 207 is not greater than the thickness of the inner helical gear ring 204.

Further, the side wall of the through hole and the outer side wall of the inner inclined gear ring 204 are provided with anti-skid grains.

Further, a plurality of semicircle orifice 108 has been seted up to hole 101 inside wall front end along the axis direction of hole 101, second locating hole 104 has still been seted up on the inside wall top of hole 101, fixedly connected with plastic meson 105 in the second locating hole 104, button 206 cover is established in plastic meson 105 and can be followed the axis removal of hole 101, the outside wall rear end of button 206 is provided with spring convex device 3, spring convex device 3 and semicircle orifice 108 looks adaptation, first locating hole 106 has been seted up to the outside wall rear end of button 206, be provided with wear pad 107 in the first locating hole 106, the outside wall of wear pad 107 and the inside wall sliding connection of hole 101.

Further, the spring protrusion device 3 includes a mounting hole 31 formed in the side wall of the button 206, a ball 32 is disposed in the mounting hole 31, the semicircular hole 108 and the mounting hole 31 are both adapted to the ball 32, a small spring 33 is further disposed in the mounting hole 31, the bottom end of the small spring 33 is connected to the bottom wall of the mounting hole 31, and the top end of the small spring 33 is connected to the ball 32.

Further, a ring seat is arranged on the side wall of the hole 101, a spring 208 is arranged below the button 206, the upper end of the spring 208 is connected with the lower end face of the button 206, and the bottom end of the spring 208 is connected with the upper end face of the ring seat.

Further, a safety rope hole is formed in the top of the button 206, and a safety rope is arranged in the safety rope hole.

Example 1

In this embodiment, through setting up handle 1 to the retractable, handle 1 adjustable length, when medical staff carried out root canal preparation to patient's tooth, can select the length of handle 1 according to the particular case of patient's oral cavity degree of opening and shutting, not only adapted to the degree of opening and shutting of patient's oral cavity, still with medical staff's operation hand looks adaptation to medical staff carries out root canal preparation. Midway in the root canal preparation, the cutting part of root canal has got into in the root canal this moment, can stretch handle 1 this moment so that medical staff carries and draws or rotatory root canal file, has greatly made things convenient for medical staff to operate the root canal file. The counter 2 is arranged on the handle 1 of the root canal file, the counter 2 can count the number of times of the root canal file visually and conveniently and display the number on the handle 1 to prompt the service life of the root canal file of medical workers. This embodiment structure is ingenious, and the count is convenient, uses the number of times direct display on handle 1, easily observes, avoids appearing because maloperation or the root canal file places the circumstances such as the count confusion that the mistake brought when counting on the root canal file frame among the prior art. The present embodiment also shows a specific structure of the counter 2, because the root canal file has a strict limitation on the number of uses, generally no more than 15, and some products require about 5, therefore, in the present embodiment, there is only one character wheel 201, and the side wall of the character wheel 201 is provided with a digital mark, and the digital mark can be customized according to the specific life of the specific product. When the medical staff uses the medical staff to press the button 206, the button 206 drives the connecting rod 205 to move downwards together, the stroke of the button 206 is fixed, therefore, the stroke of the downward movement of the connecting rod 206 is also fixed, the ring is restrained in the annular groove 102 and does not move up and down, at the moment, the oblique block slides along the track of the oblique groove in the oblique groove, and simultaneously, the oblique block also moves downwards together with the connecting rod 205, therefore, in the downward movement process of the oblique block, the oblique block drives the oblique groove matched with the oblique block, namely, the ring rotates for a fixed angle, the outer side wall of the ring drives the character wheel 201 to rotate for a fixed angle through friction force, the rotating angle of the character wheel 201 corresponds to the stroke of the button 206, at the moment, the digital mark observed from the display hole 103 rotates for an angle, namely, the counting is increased by. The button 206 is reset after the stroke is finished, at this time, the button 206 drives the oblique block to move upwards reversely through the connecting rod 205, but because the character wheel 201 rotates for an angle and is clamped by the ratchet wheel 202 through the pawl device 203 on the wall of the hole 101, the character wheel 201 does not rotate reversely along with the reset of the button 206, at this time, only the circular ring rotates reversely and resets. For the next use, the medical practitioner again presses the button 206 and the counter 2 repeats the steps described above. This simple structure is reliable, the manipulation of being convenient for, and the count is convenient and reliable, is difficult for receiving external disturbance, because even finger touches button 206 in the root canal preparation, a stroke can not walked yet to the button, character wheel 201 also can not rotate a complete angle and is blocked by detent device 203 to the count can not change easily.

Example 2

Further, in order to increase the reliability of the counter and simultaneously improve the standardization degree of the utility model, the production cost is reduced, and the circular ring is arranged as an inner inclined gear ring 204; the chute is the inner teeth on the inner bevel gear ring 204; the bottom of the connecting rod 205 is sleeved with a bevel gear 207, a bevel block is external teeth on the bevel gear 207, and the bevel gear 207 is meshed with the internal bevel gear ring 204.

Example 3

On the basis of embodiment 2, in order to reduce the volume of the counter 2 and make the mechanism of the counter 2 more compact, the thickness of the helical gear 207 is not greater than that of the inner helical gear 204.

Example 4

On the basis of embodiment 2, in order to increase the friction force between the inner bevel gear ring 204 and the character wheel 201, the inner bevel gear ring is convenient to drive the character wheel to rotate, and the side wall of the through hole and the outer side wall of the inner bevel gear ring 204 are both provided with anti-skid grains.

Example 5

On the basis of embodiment 1, a plurality of semicircle orifice 108 has been seted up to hole 101 inside wall front end along the axis direction of hole 101, second locating hole 104 has still been seted up to the inside wall top of hole 101, fixedly connected with plastic meson 105 in the second locating hole 104, button 206 cover is established in plastic meson 105 and can be followed the axis of hole 101 and moved, the outside wall rear end of button 206 is provided with spring convex device 3, spring convex device 3 and semicircle orifice 108 looks adaptation, first locating hole 106 has been seted up to the outside wall rear end of button 206, be provided with wear pad 107 in the first locating hole 106, the outside wall of wear pad 107 and the inside wall sliding connection of hole 101.

This embodiment shows a specific structure of a telescopic handle, which ensures a small gap when telescopic by the tensioning action of the plastic meson 105. No slipping phenomenon occurs. Meanwhile, the wear-resistant sheet fixedly mounted plays a supporting role, so that the button 206 and the hole 101 are prevented from being relatively worn to hinder the operation of medical staff, and the use hand feeling of the medical staff is greatly improved.

Example 6

On the basis of embodiment 5, the spring protrusion apparatus 3 includes a mounting hole 31 formed on the side wall of the button 206, a small ball 32 is disposed in the mounting hole 31, the semicircular hole 108 and the mounting hole 31 are both matched with the small ball 32, a small spring 33 is further disposed in the mounting hole 31, the bottom end of the small spring 33 is connected with the bottom wall of the mounting hole 31, and the top end of the small spring 33 is connected with the small ball 32.

The embodiment shows a specific structure of a spring protrusion device, the structure of the protrusion device is simple and reliable, the ball 32 is tightly attached to the wall of the hole 101 under the action of the small spring 33, when the ball 32 moves to the semicircular hole 108, the ball 32 directly enters the semicircular hole 108, at this time, the ball 32 and the semicircular hole 108 directly lock the button 206 and the wall of the hole 101, and at this time, the handle 1 is not extended any more.

Example 7

On the basis of embodiment 1, a ring seat is arranged on the side wall of the hole 101, a spring 208 is arranged below the button 206, the upper end of the spring 208 is connected with the lower end face of the button 206, and the bottom end of the spring 208 is connected with the upper end face of the ring seat. The purpose is to facilitate resetting of the button 206, to increase the resistance to button 206 depression, and to prevent any minor touching of the button 206 during root canal preparation from causing the counter 2 to count up by one.

Example 8

On the basis of embodiment 1, because the handle length of the root canal file is only 10mm to 13mm, in order to prevent the root canal file from falling in the root canal preparation process, the top of the button 206 is provided with a safety rope hole, and a safety rope is arranged in the safety rope hole. In use, the hand cord 4 is strapped around the wrist of a medical practitioner.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A telescopic counting root canal file comprises a handle (1), wherein the handle (1) is a telescopic handle, and a counter (2) is arranged on the handle (1); a hole (101) is formed in the upper end face of the handle (1), an annular groove (102) is formed in the inner side wall of the hole (101), and a display hole (103) is formed in the side wall of the annular groove (102); characterized in that the counter (2) comprises: a character wheel (201) sleeved on the annular groove (102), wherein the outer side wall of the character wheel (201) is provided with a digital mark, the upper end surface of the character wheel (201) is fixedly connected with a ratchet wheel (202) and also comprises a pawl device (203) arranged on the side wall of the hole (101), the pawl device (203) is connected with the ratchet wheel (202), a through hole is arranged on the end surface of the print wheel (201), the axis of the through hole is collinear with the axis of the print wheel (201), a circular ring is sleeved in the through hole, the inner side wall of the circular ring is provided with a chute, the upper end of the hole is sleeved with a button (206), the button (206) is movable within the bore (101) along the axis of the bore (101), the bottom of the button (206) is connected with a connecting rod (205), an inclined block is arranged on the side wall of the connecting rod (205), and the inclined block is matched with the inclined groove.

2. A retractable counter root canal file as set forth in claim 1, wherein: the circular ring is arranged into an inner inclined gear ring (204); the inclined groove is internal teeth on the internal inclined gear ring (204); the bottom of the connecting rod (205) is sleeved with a bevel gear (207), the bevel block is external teeth on the bevel gear (207), and the bevel gear (207) is meshed with the internal bevel gear ring (204).

3. A retractable counter root canal file according to claim 2, wherein: the thickness of the bevel gear (207) is not more than that of the inner bevel gear ring (204).

4. A retractable counter root canal file according to claim 2, wherein: and anti-skid grains are arranged on the side wall of the through hole and the outer side wall of the inner bevel gear ring (204).

5. A retractable counter root canal file as set forth in claim 1, wherein: a plurality of semicircle orifice (108) have been seted up along the axis direction in hole (101) to hole (101) inside wall front end, second locating hole (104) have still been seted up on the inside wall top in hole (101), fixedly connected with plastic meson (105) in second locating hole (104), button (206) cover is established in plastic meson (105) and can follow the axis in hole (101) removes, the lateral wall rear end of button (206) is provided with spring convex device (3), spring convex device (3) with semicircle orifice (108) looks adaptation, first locating hole (106) have been seted up to the lateral wall rear end of button (206), be provided with wear pad (107) in first locating hole (106), the lateral wall of wear pad (107) with the inside wall sliding connection in hole (101).

6. A retractable counter root canal file as set forth in claim 5, wherein: spring protrusion device (3) are including seting up mounting hole (31) on button (206) lateral wall, be provided with bobble (32) in mounting hole (31), semicircle orifice (108), mounting hole (31) all with bobble (32) looks adaptation, still be provided with bobble (33) in mounting hole (31), the bottom of bobble (33) with the diapire of mounting hole (31) is connected, the top of bobble (33) with bobble (32) are connected.

7. A retractable counter root canal file as set forth in claim 1, wherein: the side wall of the hole (101) is provided with a ring seat, a spring (208) is arranged below the button (206), the upper end of the spring (208) is connected with the lower end face of the button (206), and the bottom end of the spring (208) is connected with the upper end face of the ring seat.

8. A retractable counter root canal file as set forth in claim 1, wherein: the top of the button (206) is provided with a safety rope hole, and a safety rope is arranged in the safety rope hole.