Machine root canal file and clamping mechanism

Abstract

The utility model provides a machine-used root canal file and clamping mechanism, the machine-used root canal file is an integrated structure, including clamping portion and connecting the cutting portion of one end of clamping portion, clamping portion includes columnar main part and set up in the positioning structure of main part periphery, main part's maximum outer diameter is different from the maximum outer diameter of positioning structure, and the cutting portion is connected with the clamping portion. And the cross section shape of the main body is different from that of the positioning structure. The machine-used root canal file is integrally arranged, a handle does not need to be additionally arranged for being matched with a clamping mechanism of a root canal preparation machine, the structure is simpler, the material cost and the machining cost are lower, after the positioning structure is matched with the clamping mechanism, the machine-used root canal file can be prevented from being separated from the clamping mechanism or slipping, clamping is more stable, and the service life of the machine-used root canal file is prolonged. And a plurality of positioning structures can be arranged, so that the length of the part, exposed out of the clamping mechanism, of the cutting part is adjusted, and telescopic adjustment of the root canal file for the machine is realized through the interface.

Description

TECHNICAL FIELD

[0001] The utility model belongs to dental medical instrument technical field especially relates to a machine is with root canal file and clamping mechanism. BACKGROUND

[0002] In the dental medical industry, root canal therapy is the most commonly used effective treatment method for pulp disease and periapical disease, mainly through mechanical and chemical methods to remove most of the infection in the root canal, and through filling root canal, closing crown, preventing the occurrence of periapical lesion, promoting the healing of periapical lesion that has occurred.

[0003] In the mechanical method of the root canal therapy process, root canal files need to be used, in the related art, the root canal file usually includes a handle and a file body fixed on the handle, the handle and the file body are different components, fixed through assembly, the structure is complex, the material cost and the process cost are high, and some root canal files without handle are easy to fall off when clamped and used with a root canal preparation machine. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model lies in providing a machine root canal file and clamping mechanism, aiming at solving the problem of complex structure of the root canal file in the prior art and easy falling off when clamped and used.

[0005] To solve the above technical problems, the utility model is implemented in the following manner, a machine root canal file is provided, which is of an integrated structure, including a clamping part and a cutting part connected to one end of the clamping part, the clamping part includes a cylindrical main body and a positioning structure arranged on the outer periphery of the main body, the maximum outer diameter of the main body and the maximum outer diameter of the positioning structure are not the same, and the cross-sectional shape of the main body and the cross-sectional shape of the positioning structure are different.

[0006] Further, the cross section of the main body is circular, the cross section of the positioning structure is polygonal or spline-shaped, and the main body and the positioning structure are coaxially arranged.

[0007] Further, the outer diameter of the main body is 0.8-2.5 mm, the minimum outer diameter of the positioning structure is 0.7-2.3 mm, and the maximum outer diameter of the positioning structure is less than or equal to the outer diameter of the main body.

[0008] Further, the cross section of the main body is polygonal or spline-shaped, the cross section of the positioning structure is circular, and the main body and the positioning structure are coaxially arranged.

[0009] Further, the outer diameter of the main body is 0.8-2.5 mm, the minimum outer diameter of the positioning structure is 0.7-2.1 mm, and the maximum outer diameter of the positioning structure is less than or equal to the outer diameter of the main body.

[0010] Further, in the axial direction of the root canal file, the projection of the positioning structure is entirely within the projection of the main body.

[0011] Alternatively, in the axial direction of the root canal file, at least part of the edge of the projection of the positioning structure protrudes outside the projection of the main body.

[0012] Further, the main body is provided with at least two positioning structures spaced along the length direction of the main body, the positioning structures have a dimension of 0.3-0.8mm in the axial direction, the total length of each positioning structure is 3-16mm, and the distal end of the main body is at least 1.5mm away from the nearest positioning structure.

[0013] Further, the main body is provided with at least three positioning structures, each of which is equidistantly spaced, and the spacing between adjacent positioning structures is 0.8-1.5mm.

[0014] Further, a clamping mechanism is provided, which comprises a sleeve and at least two clamping petals connected to one end of the sleeve, each of the clamping petals encloses a clamping cavity in communication with the inner cavity of the sleeve, the clamping cavity is used for accommodating the clamping part of the machine root canal file according to any one of the above or for accommodating the end part of a car needle, the end part of the car needle has the clamping part, the clamping petals are elastic and can be deformed in the radial direction of the sleeve, and the inner side of each clamping petal is provided with a limiting structure matched with the positioning structure.

[0015] Further, the inner diameter of the sleeve is 0.85-2.55mm, the outer diameter of the sleeve is 2-5mm, the dimension of the limiting structure in the axial direction is 0.31-0.9mm, the total length of the sleeve and the clamping petals is 5-20mm, and the distance from the limiting structure to the distal end of the clamping petals is 1-3mm.

[0016] Compared with the prior art, the machine root canal file and the clamping mechanism have the beneficial effects that:

[0017] In the scheme, the clamping part of the machine root canal file is used for clamping of the root canal preparation machine, the cutting part is used for rotating under the driving of the root canal preparation machine for cutting teeth, the main body of the clamping part is columnar, so it can extend into the clamping mechanism of the root canal preparation machine, the outer periphery of the main body is provided with a positioning structure, because the maximum outer diameter of the main body and the maximum outer diameter of the positioning structure are not the same, the cross-sectional shape of the main body and the cross-sectional shape of the positioning structure are different, a stepped structure is formed between the positioning structure and the main body, and the positioning structure is used for matching with the clamping mechanism of the root canal preparation machine. In this way, the machine root canal file of the scheme is integrally arranged, and a handle does not need to be additionally arranged for matching with the clamping mechanism of the root canal preparation machine, so that the structure is simpler, the material cost and the processing cost are lower, and moreover, after the positioning structure matches with the clamping mechanism, the machine root canal file can be prevented from being separated from or slipping from the clamping mechanism, the clamping is more stable, and the use is safer and more reliable. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a partial structure front view of a machine root canal file in an example of an embodiment of the utility model;

[0019] Figure 2 is a shape and position schematic view of a main body and a positioning structure of a machine root canal file in an axial direction in an example of an embodiment of the utility model;

[0020] Figure 3 is a partial structure front view of a machine root canal file in another example of an embodiment of the utility model;

[0021] Figure 4 is a shape and position schematic view of a main body and a positioning structure of a machine root canal file in an axial direction in another example of an embodiment of the utility model;

[0022] Figure 5 is a longitudinal section schematic view of a clamping mechanism in an embodiment of the utility model;

[0023] Figure 6 is a structure diagram of a machine root canal file assembly direction view of a clamping mechanism in an example of an embodiment of the utility model;

[0024] Figure 7 is a structure diagram of a machine root canal file assembly direction view of a clamping mechanism in another example of an embodiment of the utility model.

[0025] In the drawings, various reference signs represent: 1, clamping part; 11, main body; 12, positioning structure; 10, sleeve; 20, clamping lobe; 201, limiting structure. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the utility model is further described in detail below in combination with the drawings and examples.

[0027] In the embodiment, in combination with Figures 1-4 , a machine root canal file is provided, which is a one-piece structure, comprising a clamping part 1 and a cutting part (not shown) connected to one end of the clamping part 1, the clamping part 1 comprises a cylindrical main body 11 and a positioning structure 12 arranged on the outer periphery of the main body 11, the maximum outer diameter of the main body 11 and the maximum outer diameter of the positioning structure 12 are different, and the cross-sectional shape of the main body 11 and the cross-sectional shape of the positioning structure 12 are different.

[0028] In the scheme, the clamping part 1 of the machine root canal file is used for clamping of the root canal preparation machine, the cutting part is used for rotating under the driving of the root canal preparation machine for cutting teeth, the main body 11 of the clamping part 1 is cylindrical, so it can extend into the clamping mechanism of the root canal preparation machine, the outer periphery of the main body 11 is provided with the positioning structure 12, since the maximum outer diameter of the main body 11 and the maximum outer diameter of the positioning structure 12 are different, the cross-sectional shape of the main body 11 and the cross-sectional shape of the positioning structure 12 are different, a stepped structure is formed between the positioning structure 12 and the main body 11, and the positioning structure 12 is used for matching with the clamping mechanism of the root canal preparation machine. In this way, the machine root canal file of the scheme is integrally provided, without the need for additional configuration of a handle for matching with the clamping mechanism of the root canal preparation machine, the structure is simpler, the material cost and processing cost are lower, and moreover, after the positioning structure 12 matches with the clamping mechanism, the machine root canal file can be prevented from being separated from or slipping with the clamping mechanism, the clamping is more stable, and the use is safer and more reliable.

[0029] In the application, the cutting part and the clamping part 1 are coaxial structures, and the machine root canal file rotates around the axis for cutting when driven by the root canal preparation machine, and it should be understood that the structure of the cutting part can be set according to actual conditions, for example, each cutting part can comprise at least three spiral blades, the cross section of the spiral blade can be triangular, square, regular pentagonal, regular hexagonal, etc., and in addition, under the shapes listed above, the edge of the cross section of the spiral blade can be set as a straight line, a curve concave inward or a curve convex outward, so as to meet different cutting requirements.

[0030] Further, in combination with Figures 1-2, the cross section of the main body 11 can be circular, the cross section of the positioning structure 12 can be polygonal or spline-shaped, the polygon is preferably regular polygon, and the main body 11 and the positioning structure 12 are coaxially arranged. In the embodiment, the cross section of the main body 11 is circular, and the cross section of the positioning structure 12 is regular hexagon, wherein, in the axial direction, the projection of the positioning structure 12 is the inscribed regular hexagon of the projection of the main body 11, so that the outer side surface of the positioning structure 12 and the outer side surface of the main body 11 form a groove, which matches the inner cavity of the clamping mechanism of the root canal preparation machine, so as to be axially and circumferentially limited when clamped, preventing falling off or slipping during use, and being more stable and reliable.

[0031] In some embodiments, when the cross section of the main body 11 is circular, the cross section of the positioning structure 12 can be regular quadrilateral, regular pentagon, regular hexagon, regular heptagon, etc., and can also be spline-shaped, i.e. the outer periphery is similar to gear-shaped or star-shaped, etc. In the axial direction, the projection of the positioning structure 12 is preferably the inscribed shape of the projection of the main body 11, so that the clamping part 1 of the machine root canal file is more convenient to insert into the clamping mechanism and is not easy to be stuck. Of course, the projection of the positioning structure 12 can also be completely within the projection of the main body 11.

[0032] When the cross section of the main body 11 is circular, the outer diameter of the main body 11 is 0.8-2.5mm, the minimum outer diameter of the positioning structure 12 is 0.7-2.3mm, and the maximum outer diameter of the positioning structure 12 is less than or equal to the outer diameter of the main body 11. Exemplarily, the outer diameter of the main body 11 is 1.6±0.005mm, the minimum outer diameter of the positioning structure 12 is 1.38±0.01mm, and the maximum outer diameter of the positioning structure 12 is less than or equal to the outer diameter of the main body 11. Such structure design can facilitate the positioning of the clamping part 1 on the one hand, and can ensure the structural strength of the clamping part 1 on the other hand, avoiding the breakage of the clamping part 1 due to excessive torque. It should be understood that the sizes of the main body 11 and the positioning structure 12 can be adaptively set according to the actual shape and actual application needs.

[0033] Further, in combination with Figures 3-4The cross section of the main body 11 can be polygonal or spline-shaped, and the cross section of the positioning structure 12 can be circular. The main body 11 and the positioning structure 12 are coaxially arranged. In this embodiment, the cross section of the main body 11 is a regular hexagon, and the cross section of the positioning structure 12 is circular. In the axial direction, the projection of the positioning structure 12 is an inscribed circle of the projection of the main body 11. In this way, a groove is formed between the outer side surface of the positioning structure 12 and the outer side surface of the main body 11, which matches the inner cavity of the clamping mechanism of the root canal preparation machine, so that the machine root canal file is axially limited when clamped. The inner cavity of the clamping mechanism matches the shape of the main body 11, and the main body 11 and the clamping mechanism are assembled to circumferentially limit the machine root canal file, thereby preventing the machine root canal file from falling off or slipping during use, and being more stable and reliable.

[0034] In some embodiments, the cross section of the main body 11 can be a regular quadrilateral, a regular pentagon, a regular hexagon, a regular heptagon, etc., and can also be spline-shaped, i.e., similar to a gear shape or a star shape, etc. The cross section of the positioning structure 12 is circular. In the axial direction, the projection of the positioning structure 12 is preferably an inscribed shape of the projection of the main body 11, which is more convenient for the clamping part 1 of the machine root canal file to be inserted into the clamping mechanism and not to be easily stuck. Of course, the projection of the positioning structure 12 can also be completely within the projection of the main body 11.

[0035] When the cross section of the positioning structure 12 is circular, the outer diameter of the main body 11 is 0.8-2.5 mm, the minimum outer diameter of the positioning structure 12 is 0.7-2.1 mm, and the maximum outer diameter of the positioning structure 12 is less than or equal to the outer diameter of the main body 11. For example, the outer diameter of the main body 11 can be 1.39±0.005 mm, the minimum outer diameter of the positioning structure 12 can be 1.39±0.005 mm, and the maximum outer diameter of the positioning structure 12 can be 1.6±0.005 mm. Such a structure design can facilitate the positioning of the clamping part 1, and on the other hand, can ensure the structural strength of the clamping part 1, avoiding the breakage of the clamping part 1 due to excessive torque. It should be understood that the sizes of the main body 11 and the positioning structure 12 can be adaptively set according to the actual shape and actual application needs.

[0036] In order to ensure the structural strength of the clamping part 1, the ratio of the cross section area of the positioning structure 12 to the cross section area of the main body 11 is preferably greater than 0.8.

[0037] In some embodiments, in the axial direction, the projection edge of the positioning structure 12 can partially protrude outside the projection edge of the main body 11, so that the outer diameter of the positioning structure 12 is greater than that of the main body 11, and a structure similar to a shoulder can be formed to achieve positioning and limiting.

[0038] Further, in the machine root canal file as various embodiments above, the outer periphery of the main body 11 can be provided with at least two positioning structures 12 along the length direction, the positioning structure 12 has an axial direction size of 0.3-0.8mm, and the total length of each positioning structure 12 is 3-16mm, and the end of the main body 11 is at least 1.5mm away from the nearest positioning structure 12. Exemplarily, the axial direction size of the positioning structure 12 is 0.45±0.01mm, and the end of the main body 11 is at least 1.5mm away from the nearest positioning structure 12. In this way, on the one hand, the clamping operation of the clamping part 1 and the structural reliability can be ensured, and on the other hand, by clamping different positioning structures 12 through the clamping mechanism, the length of the cutting part of the machine root canal file extending out of the clamping mechanism can be adjusted, the extension adjustment and fixation of the machine root canal file are realized, and the use of root canal preparation is facilitated.

[0039] Preferably, the main body 11 is provided with at least three positioning structures 12, and each positioning structure 12 is arranged at equal intervals, and the interval between adjacent positioning structures 12 is 0.8-1.5mm, and the interval is preferably 1±0.01mm in the present application. By arranging the positioning structures 12 at equal intervals, the interval between the clamping mechanisms clamped on adjacent positioning structures 12 is fixed, and the user can more intuitively judge the length of the cutting part extending out of the clamping mechanism according to the position of the clamped positioning structure 12. It should be understood that the number of positioning structures 12 can be set according to actual conditions, for example, three, four, five or the like. In order to more clearly judge which positioning structure 12 is clamped, a mark corresponding to each positioning structure 12 can be arranged on the outer side of the main body 11, the mark is arranged on the side of the corresponding positioning structure 12 close to the cutting part, and when the corresponding positioning structure 12 is clamped, the corresponding mark is exposed and closer to the clamping mechanism.

[0040] Further, the machine root canal file is made of nickel-titanium alloy, so the machine root canal file has good deformation ability, good wear resistance and good toughness, is suitable for cutting and drilling of teeth, and is not easy to damage and break.

[0041] In the present application, the machine root canal file is combined with the clamping mechanism, the clamping part and the cutting part, and the clamping mechanism is arranged on the clamping part. Figures 5-7Also provided is a clamping mechanism comprising the sleeve 10 and at least two clamping petals 20 connected to one end of the sleeve 10, each clamping petal 20 encloses a clamping cavity in communication with the inner cavity of the sleeve 10, the clamping cavity is used to accommodate the clamping portion 1 of the dental root file of each implementation manner above or the end of the car needle, the end of the car needle has the clamping portion 1 described above, it should be understood that the clamping mechanism of the present solution is not limited to clamping the dental root file and the car needle, as long as the object having the clamping portion 1 described above can be clamped by it, the clamping petal 20 is elastic and can be deformed in the radial direction of the sleeve 10, the inner side of each clamping petal 20 is provided with a limiting structure 201 matched with the positioning structure 12. The inner diameter of the sleeve 10 is 0.85-2.55mm, the outer diameter of the sleeve 10 is 2-5mm, the size of the limiting structure 201 in the axial direction is 0.31-0.9mm, the total length of the sleeve 10 and the clamping petal 20 is 5-20mm, and the distance from the limiting structure 201 to the end of the clamping petal 20 is 1-3mm, so that the insertion of the dental root file is facilitated, and the stability when clamped is ensured.

[0042] In the examples of the present application, the inner diameter of the sleeve 10 is 1.6±0.005mm, the outer diameter of the sleeve 10 is 2.35±0.014mm, the size of the limiting structure 201 in the axial direction is 0.5±0.01mm, the total length of the sleeve 10 and the clamping petal 20 is 8.6mm, and the distance from the limiting structure 201 to the end of the clamping petal 20 is 1.5mm.

[0043] In the present embodiment, the sleeve 10 and the clamping petal 20 are one component in the clamping mechanism, and the clamping mechanism can further comprise a driving structure arranged on the outer periphery of each clamping petal 20, the driving structure is used to extrude the outer side of the clamping petal 20 so that the clamping petal 20 deforms inward to clamp the clamping portion 1, for example, the outer side of the clamping petal 20 can be provided with a slope, and the driving structure can be an extrusion piece screw-connected to the outer side of the sleeve 10, rotating the extrusion piece can make it move up and down along the sleeve 10 to abut against the slope or release, so that the clamping petal 20 clamps or releases, for another example, a magnet can be arranged on the clamping petal 20, and the driving structure can be an electromagnet wrapped around each clamping petal 20, and the clamping petal 20 is driven to retract or expand inward or outward by the electromagnet to achieve the clamping or releasing action. The driving structure can be adaptively arranged according to the actual situation, which is not limited here.

[0044] Specifically, the cross-sectional shape of the main body 11 matches the shape of the inner cavity of the sleeve 10, so that the clamping portion 1 of the dental root file can be smoothly inserted into the inner cavity of the sleeve 10, and the limiting structure 201 comprises a protrusion arranged on the inner side of the clamping petal 20, the shape of the protrusion matches the outer side of the positioning structure 12.

[0045] As Figure 6As shown, when the positioning structure 12 is a regular hexagon, the convex parts of each clamping flap 20 can be enclosed together to form a regular hexagon, and the protruding distance of the convex part matches the positioning groove formed by the positioning structure 12 and the outer surface of the main body 11. In this way, when the clamping flaps 20 are loosened, the inner diameter of the clamping cavity enclosed between the clamping flaps 20 is larger than the outer diameter of the convex part, so that the clamping part 1 can be inserted into the clamping cavity and the inner cavity of the sleeve 10. When the positioning structure 12 and the limiting structure 201 are positioned correspondingly, each clamping flap 20 is clamped inward, so that the limiting structure 201 can be surrounded by the outside of the positioning structure 12, and the inner side surface of the limiting structure 201 abuts the outer side surface of the positioning structure 12, which can prevent the machine root canal file and the clamping mechanism from slipping in the circumferential direction. Moreover, both ends of the limiting structure 201 in the axial direction are abutted by the main body 11, which can prevent the machine root canal file from detaching from the clamping mechanism in the axial direction.

[0046] like Figure 7 As shown, when the cross-section of the main body 11 is a regular hexagon and the cross-section of the positioning structure 12 is a circle, the shapes of the inner cavity and the clamping space of the sleeve 10 are both regular hexagons. In this way, the clamping part 1 can be positioned in the circumferential direction when inserted into the clamping space and the inner cavity, and the convex parts of each clamping flap 20 can be enclosed together to form a circle. The protruding distance of the convex part and the positioning structure 12 match the positioning groove formed by the outer surface of the main body 11. In this way, when the clamping flaps 20 are loosened, the inner diameter of the clamping cavity enclosed between the clamping flaps 20 is larger than the outer diameter of the convex part, so that the clamping part 1 can be inserted into the clamping cavity and the inner cavity of the sleeve 10. When the positions of the positioning structure 12 and the limiting structure 201 correspond, each clamping flap 20 is clamped inward. In this way, the limiting structure 201 can be surrounded by the outside of the positioning structure 12, and both ends of the limiting structure 201 in the axial direction are abutted by the main body 11, which can prevent the machine root canal file from detaching from the clamping mechanism in the axial direction.

[0047] It should be understood that the shapes of the limiting structure 201 and the positioning structure 12 match. Depending on the shapes of the positioning structure 12 and the main body 11, the inner cavity of the sleeve 10, the clamping space, and the limiting structure 201 can all be adaptively configured, without limitation herein. For example, when the positioning structure 12 is a structure protruding from the main body 11, the limiting structure 201 can be a recessed portion provided on the clamping flap 20. When the machine-mounted root canal file is clamped, the positioning structure 12 is embedded in the recessed portion of the clamping flap 20. In this way, circumferential and axial limiting can be achieved to prevent disengagement.

[0048] In some implementations, in order to facilitate the insertion or extraction of the machine root canal file into or out of the clamping mechanism, guide slopes can be provided at both ends of the axial direction of the protrusion. This makes it easier for the corresponding part of the machine root canal file to squeeze the guide slopes so that each clamping petal 20 opens, making the operation easier.

[0049] In some implementations, the inner side surface of the convex part and the outer side surface of the positioning structure 12 can be provided with microstructure protrusions with a diameter, height and spacing of 10-20 μm, so that when the limiting structure 201 and the positioning structure 12 are matched and clamped, the clamping degree is higher and it is more difficult to disengage or slip.

[0050] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A machine file, characterized in that, The device is a one-piece structure, comprising a clamping portion and a cutting portion connected to one end of the clamping portion, the clamping portion comprising a cylindrical main body and a positioning structure arranged on the outer periphery of the main body, the maximum outer diameter of the main body and the maximum outer diameter of the positioning structure are not the same, the cross-sectional shape of the main body and the cross-sectional shape of the positioning structure are different.

2. The master root canal file according to claim 1, wherein The cross-section of the main body is circular, the cross-section of the positioning structure is polygonal or spline-shaped, and the main body and the positioning structure are coaxially arranged.

3. The master root canal file according to claim 2, wherein The outer diameter of the main body is 0.8-2.5mm, the minimum outer diameter of the positioning structure is 0.7-2.3mm, and the maximum outer diameter of the positioning structure is less than or equal to the outer diameter of the main body.

4. The master root canal file according to claim 1, wherein The cross-section of the main body is polygonal or spline-shaped, the cross-section of the positioning structure is circular, and the main body and the positioning structure are coaxially arranged.

5. The machine file root canal file according to claim 4, characterized in that, The outer diameter of the main body is 0.8-2.5mm, the minimum outer diameter of the positioning structure is 0.7-2.1mm, and the maximum outer diameter of the positioning structure is less than or equal to the outer diameter of the main body.

6. The master root canal file according to claim 1, wherein In the axial direction of the root canal file, the projection of the positioning structure is completely located within the projection of the main body; Or, in the axial direction of the root canal file, at least part of the edge of the projection of the positioning structure protrudes outside the projection of the main body.

7. The master root canal file according to any one of claims 1 to 6, characterized in that The outer periphery of the main body is spaced apart by at least two positioning structures along the length direction, the dimension of the positioning structure in the axial direction is 0.3-0.8mm, the total length of each positioning structure is 3-16mm, and the distance from the end of the main body to the nearest positioning structure is at least 1.5mm.

8. The machine file root canal file according to claim 7, characterized in that The outer periphery of the main body is provided with at least three positioning structures, each of which is arranged at equal intervals, and the spacing between adjacent positioning structures is 0.8-1.5mm.

9. A clamping mechanism, characterized by The device comprises a sleeve and at least two clamping petals connected to one end of the sleeve, each clamping petal encloses a clamping cavity in communication with the inner cavity of the sleeve, the clamping cavity is used to accommodate the machine root canal file or the end of the car needle, the machine root canal file and the end of the car needle have a clamping portion respectively, the clamping petal has elasticity and can be deformed in the radial direction of the sleeve, and the inner side of each clamping petal is provided with a limiting structure matched with the positioning structure.

10. The clamping mechanism of claim 9, wherein, The inner diameter of the sleeve is 0.85-2.55mm, the outer diameter of the sleeve is 2-5mm, the dimension of the limiting structure in the axial direction is 0.31-0.9mm, the total length of the sleeve and the clamping petal is 5-20mm, and the distance from the limiting structure to the end of the clamping petal is 1-3mm.

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