Root canal file

Abstract

The utility model discloses a root canal file, and relates to the technical field of root canal therapy. The utility model provides a root canal file. The root canal file comprises a grab handle; the blade part comprises a connecting part and a working part, the connecting part is used for connecting the working part and the grab handle, the connecting part is detachably connected with the grab handle, the working part is provided with a cutting edge spirally extending in the extending direction of the working part, the outer diameter of the working part in the extending direction of the working part is gradually reduced, the cross section of the working part is in a pentagon shape, and the outer diameter of the working part in the extending direction of the working part is larger than that of the pentagon. The apex angle of the pentagon is configured as the cutting edge. The root canal file aims to solve the technical problems that in the prior art, cutting faces of a blade part are few, the cutting effect is poor when the root canal file rotates by a certain angle, and the blade part is fixedly connected with a handle and is difficult to replace if only the blade part needs to be replaced.

Description

Technical Field

[0001] The present application relates to the technical field of root canal treatment, and in particular to a root canal file. Background Art

[0002] Root canal therapy is an internationally common treatment for pulp disease and periapical disease. Root canal therapy removes most of the infected substances in the root canal through mechanical and chemical methods, and prevents periapical lesions from occurring or promotes the healing of periapical lesions that have already occurred by filling the root canal and sealing the crown. Its main purpose is to remove pulp tissue and remove root canal system infection in order to preserve the entire affected tooth or root.

[0003] A root canal file is an important tool used in root canal treatment. Its main function is to remove dentin debris and infected tissue in the root canal, help prepare and expand the root canal, and provide an appropriate shape and path for subsequent root canal filling treatment. A root canal file is usually made of stainless steel or other hard materials, and has a certain elasticity and toughness to adapt to the curvature and complex shape of the root canal. The root canal file of the prior art usually includes a handle for the operator to hold and a working blade. The cutting surface of the blade is small, and the cutting effect of the root canal file is poor when it is rotated at a certain angle. In addition, the blade is fixedly connected to the handle. If only the blade needs to be replaced, it is difficult to replace. Utility Model Content

[0004] The main purpose of the present application is to provide a root canal file, aiming to solve the technical problems in the prior art that the cutting surface of the blade is small, the cutting effect is poor when the root canal file is rotated to a certain angle, and the blade is fixedly connected to the handle, making it difficult to replace only the blade.

[0005] To achieve the above-mentioned purpose, the present application provides a root canal file, a handle, and a blade, which includes a connecting portion and a working portion, the connecting portion is used to connect the working portion and the handle, the connecting portion and the handle are detachably connected, the working portion has a cutting edge that extends spirally along its extension direction, the outer diameter of the working portion gradually decreases along its extension direction, the cross-sectional shape of the working portion is a pentagon, and the vertex angle of the pentagon is configured as the cutting edge.

[0006] Optionally, the central angles of the pentagons are equal.

[0007] Optionally, a portion of the working portion adjacent to the cutting edge is inwardly arc-shaped recessed to form a spiral groove.

[0008] Optionally, a threaded hole is provided at the end of the handle, and an outer wall of the connecting portion is provided with an external thread for matching with the threaded hole.

[0009] Optionally, a positioning plate is provided on the connecting part, a limiting rod is provided on the positioning plate, a limiting hole is provided at the end of the handle for cooperating with the limiting rod, and the limiting rod can move in a direction close to or away from the handle so that the limiting rod can selectively enter the limiting hole to limit the circumferential rotation of the connecting part relative to the handle.

[0010] Optionally, a baffle is provided at a portion of the limiting rod between the handle and the positioning plate, and a compression spring is provided between the baffle and the positioning plate.

[0011] Optionally, the compression spring is sleeved on the limiting rod.

[0012] Optionally, the positioning plate is provided with a through hole extending along its thickness direction, a pin is provided in the through hole, the limiting rod is provided with a slide groove extending along its axial direction, the pin passes through the slide groove and can move relatively along its extension direction.

[0013] Optionally, the side wall of the positioning plate is provided with a through slot passing through the through hole, the width of the through slot is greater than the outer diameter of the limiting rod, and the width of the through slot is smaller than the outer diameter of the compression spring, so that the limiting rod can selectively pass through the through slot.

[0014] Optionally, the through groove extends in the radial direction of the positioning plate, and the outer end of the through groove passes through the side wall of the positioning plate.

[0015] Beneficial effects that this application can achieve:

[0016] A root canal file proposed in an embodiment of the present application is configured with a connecting portion detachably connected to a handle, thereby facilitating replacement of blades of different specifications; and by configuring the cross-sectional area of ​​the working portion to be a pentagon, the top angle of the pentagon is configured as a cutting edge. The root canal file has a pentagonal cross-sectional shape, which enables the root canal file to have higher torsion resistance, and the root canal file is not easily broken or separated due to excessive torque, thereby improving the safety and success rate of treatment; the top angle of the pentagon is configured as a cutting edge, and when the rotation angle of the root canal file is constant, the cutting area is increased, so that the root canal file has higher cutting efficiency when cleaning the root canal wall and preparing the root canal, which helps to remove the diseased tissue and infected substances in the root canal more quickly and shorten the treatment time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the root canal file of this application;

[0018] Figure 2 A schematic diagram of the cross-sectional shape of the root canal file of the present application;

[0019] Figure 3 It is a schematic diagram of the local structure at the positioning plate;

[0020] Figure 4 for Figure 3 Another state structural diagram of;

[0021] Figure 5 It is a schematic diagram of the side structure of the positioning plate.

[0022] In the figure: 10-handle, 11-limiting hole, 20-blade part, 21-connecting part, 22-working part, 221-blade edge, 30-positioning plate, 31-limiting rod, 32-baffle, 33-compression spring, 34-slide groove, 40-pin shaft, 41-through groove.

[0023] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0028] Example 1

[0029] Reference Figure 1-Figure 5 ,in Figure 1 The M in the figure represents a connection part, and the N represents a working part. The first embodiment of the present application provides a root canal file, comprising: a handle 10 and a blade 20. The blade 20 comprises a connection part 21 and a working part 22, wherein the connection part 21 is used to connect the working part 22 to the handle 10, and the connection part 21 and the handle 10 are detachably connected, and the working part 22 has a cutting edge 221 extending spirally along its extension direction, and the outer diameter of the working part 22 gradually decreases along its extension direction, and the cross-sectional shape of the working part 22 is a pentagon, and the vertex of the pentagon is configured as the cutting edge 221.

[0030] In this embodiment, the handle 10 and the blade 20 are detachably connected. When the operator needs to use a blade 20 of a different model and specification, only the blade 20 can be replaced. Compared with the prior art in which the handle 10 and the blade 20 are fixedly connected, it is not convenient to replace the blade 20. The handle 10 is a standard part. Different operators have different usage habits and different feelings when holding the handle 10, which may have an adverse effect on the operation process. When the blade 20 can be replaced, the handle 10 can be customized according to the operator's preferences or usage habits. When a different blade 20 is needed, the blade 20 can be replaced, thereby improving the operator's experience during operation. The cutting edge 221 of the working part 22 is spiral-shaped, and the working part 22 and the connecting part 21 can be integrally formed. One end of the working part 22 is connected to the connecting part 21, and the other end of the working part 22 is a free end. The outer diameter of the working part 22 gradually decreases along the direction close to the free end. The maximum outer diameter of the working portion 22 is 16-20 mm, preferably 16.5 mm; the minimum outer diameter of the working portion 22 is 2-5 mm, preferably 3 mm. By configuring the cross section of the blade 20 to be pentagonal, the cutting edge 221 extends in a spiral shape along the axis of the working portion 22, and the number of cutting edges 221 on the circumference is increased. When the root canal file rotates at a certain angle, the cutting area of ​​the cutting edge 221 is increased, which is beneficial to improving the cutting efficiency.

[0031] Example 2

[0032] As an optional implementation, refer to Figure 1 and Figure 2 This embodiment provides a specific structure of the working portion 22 of a root canal file, including: the central angles of the pentagons are equal.

[0033] Optionally, a portion of the working portion 22 adjacent to the cutting edge 221 is inwardly recessed in an arc shape to form a spiral groove.

[0034] In this embodiment, the corresponding central angles of the pentagons are equal, that is, the pentagons are regular pentagons, which makes the structure of the root canal file more symmetrical and the force on the root canal file more uniform, which is beneficial to improving the stability of the root canal file during use and improving the cutting efficiency of the root canal file. By forming the spiral groove, the debris generated during the operation of the root canal file can be accommodated and guided to a certain extent, so as to prevent the falling debris from affecting the normal use of the root canal file.

[0035] Example 3

[0036] As an optional implementation, this embodiment provides a specific connection method for detachably connecting the handle 10 and the connecting part 21, including: a threaded hole is provided at the end of the handle 10, and an outer wall of the connecting part 21 is provided with an external thread for matching with the threaded hole.

[0037] In this embodiment, the handle 10 and the connecting portion 21 are threadedly matched, so that the connecting portion 21 can be quickly and easily disassembled and installed.

[0038] Example 4

[0039] As an optional implementation, refer to Figure 3-Figure 5 The present embodiment provides a specific structure in which a positioning plate 30 is provided on the connection part 21, including: a positioning plate 30 is provided on the connection part 21, a limiting rod 31 is provided on the positioning plate 30, a limiting hole 11 for cooperating with the limiting rod 31 is provided at the end of the handle 10, and the limiting rod 31 can move in a direction close to or away from the handle 10, so that the limiting rod 31 can selectively enter the limiting hole 11 to limit the circumferential rotation of the connection part 21 relative to the handle 10.

[0040] In this embodiment, the positioning plate 30 is in the shape of a disc. The positioning plate 30 is arranged on the connecting portion 21. The positioning plate 30 has a mounting hole for the connecting portion 21 to pass through. The positioning plate 30 can be connected to the connecting portion 21 by welding or bonding. The positioning plate 30 can also be connected to the connecting portion 21 by threaded matching. It should be noted that when the positioning plate 30 is threadedly matched with the connecting portion 21, the connecting portion 21 has a first thread and a second thread with opposite rotation directions. The first thread is used to match the handle 10, and the second thread is used to match the positioning plate 30. By setting the positioning plate 30, a limiting rod 31 is arranged on the positioning plate 30. When the connecting portion 21 and the handle 10 are assembled, the limiting rod 31 enters the limiting hole 11. The limiting rod 31 cooperates with the limiting hole 11 to form an axial rotation limit, thereby ensuring that the blade 20 and the handle 10 of the root canal file will not rotate relative to each other during the rotational cutting process of the root canal file, thereby improving the accuracy of the operator's control of the rotation angle of the root canal file.

[0041] Example 5

[0042] As an optional implementation, refer to Figure 3 and Figure 4 This embodiment provides a specific structure of a limiting rod 31 , including: a baffle 32 is provided at the portion of the limiting rod 31 between the handle 10 and the positioning plate 30 , and a compression spring 33 is provided between the baffle 32 and the positioning plate 30 .

[0043] Optionally, the compression spring 33 is sleeved on the limiting rod 31 .

[0044] Optionally, the positioning plate 30 is provided with a through hole (not shown in the figure) penetrating along its thickness direction, a pin shaft 40 is provided in the through hole, the limiting rod 31 is provided with a slide groove 34 extending along its axial direction, the pin shaft 40 passes through the slide groove 34 and can move relatively along its extension direction.

[0045] In this embodiment, by providing the baffle plate 32 and the compression spring 33, one end of the compression spring 33 contacts the positioning plate 30, and the other end of the compression spring 33 contacts the baffle plate 32. The elastic force of the compression spring 33 makes the limiting rod 31 always have a tendency to move away from the positioning plate 30, so that after the limiting rod 31 enters the limiting hole 11, it can remain in the limiting hole 11, and prevent the limiting rod 31 from slipping out of the limiting hole 11 at will. By sleeve-arranging the compression spring 33 on the limiting rod 31, the compression spring 33 plays a limiting role, ensuring that both ends of the compression spring 33 can always contact the baffle plate 32 and the positioning plate 30. By setting a pin shaft 40 on the positioning plate 30 and a slide groove 34 on the limit rod 31, when the guide rod moves, the pin shaft 40 moves relatively in the slide groove 34 along the extension direction of the slide groove 34, thereby improving the integrity of the limit rod 31 and the positioning plate 30, limiting the maximum stroke position of the left and right movement of the limit rod 31, and preventing the limit rod 31 from completely detaching from the positioning plate 30.

[0046] Example 6

[0047] As an optional implementation, refer to Figure 3-Figure 5 This embodiment provides a specific structure of a positioning plate 30, including: a through slot 41 with a through hole is provided on the side wall of the positioning plate 30, the width of the through slot 41 is greater than the outer diameter of the limiting rod 31, and the width of the through slot 41 is less than the outer diameter of the compression spring 33, so that the limiting rod 31 can selectively pass through the through slot 41.

[0048] Optionally, the through slot 41 extends in the radial direction of the positioning plate 30 , and an outer end of the through slot 41 passes through a side wall of the positioning plate 30 .

[0049] In this embodiment, by providing a through slot 41 on the side wall of the positioning plate 30, the limiting rod 31 can be rotated ninety degrees, part of the limiting rod 31 is located in the through slot 41, the compression spring 33 and the baffle 32 are located outside the positioning plate 30, and the compression spring 33 is further compressed; at this time, the outer end of the limiting rod 31 is located outside the positioning plate 30, increasing the radial length of the positioning plate 30, making it easier for the operator to apply a circumferential rotational external force to the positioning plate 30 through the limiting rod 31, and reducing the influence of the connection part 21 being inconvenient to directly apply a circumferential external force to the connection part 21 due to the small outer diameter size, so that the connection part 21 can be assembled to the handle 10 more quickly. When the axis of the limiting rod 31 is in the radial extension state of the positioning plate 30, the radial empty space occupied by the positioning plate 30 can also be reduced, which is conducive to its storage.

[0050] When the connecting portion 21 is mounted on the handle 10 by applying a circumferential external force to the limiting rod 31 (such as Figure 4As shown in the figure, at this time, an external force is further compressed on the compression spring 33 to reserve enough necessary space for the limit rod 31 to rotate around the pin 40, and then the limit rod 31 is rotated to the left by a certain angle. When the baffle plate 32 and the compression spring 33 on the limit rod 31 rotate to the left end of the positioning plate 30, an external force is applied to the limit rod 31 as a whole to move it in the direction close to the pin 40, so that the limit rod 31 can move horizontally between the handle 10 and the positioning plate 30. After the limit rod 31 is released, under the elastic force of the compression spring 33, the limit rod 31 automatically enters the limit hole 11 to complete the locking (as shown in the figure). Figure 3 When the blade 20 needs to be removed from the handle 10, the above operation can be reversed.

[0051] Optionally, two through slots 41 or a plurality of through slots 41 may be provided on the positioning plate 30. When the number of the through slots 41 is two ( Figure 3-Figure 5 In the case shown in the figure), the extension directions of the two through grooves 41 pass through the center of the circle and are on the same straight line, and a limit rod 31 structure is provided in each through groove 41; when the number of the through grooves 41 is multiple (not shown in the figure), all the through grooves 41 are distributed in a ring shape, and a limit rod 31 is provided in each through groove 41.

[0052] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A root canal file, characterized in that: include: Handle; The blade portion includes a connecting portion and a working portion, wherein the connecting portion is used to connect the working portion and the handle, and the connecting portion and the handle are detachably connected. The working portion has a cutting edge that extends spirally along its extension direction, and the outer diameter of the working portion gradually decreases along its extension direction. The cross-sectional shape of the working portion is a pentagon, and the vertex angle of the pentagon is constructed as the cutting edge.

2. The root canal file according to claim 1, characterized in that: The corresponding central angles of the pentagons are equal.

3. The root canal file according to claim 1, characterized in that: The portion of the working portion adjacent to the cutting edge is inwardly concave in an arc shape to form a spiral groove.

4. The root canal file according to claim 1, characterized in that: A threaded hole is provided at the end of the handle, and an outer wall of the connecting portion is provided with an external thread for matching with the threaded hole.

5. The root canal file according to claim 1, characterized in that: The connecting part is provided with a positioning plate, and a limiting rod is provided on the positioning plate. The end of the handle is provided with a limiting hole for cooperating with the limiting rod. The limiting rod can move in a direction close to or away from the handle, so that the limiting rod can selectively enter the limiting hole to limit the circumferential rotation of the connecting part relative to the handle.

6. The root canal file according to claim 5, characterized in that: A baffle is provided on the portion of the limiting rod between the handle and the positioning plate, and a compression spring is provided between the baffle and the positioning plate.

7. The root canal file according to claim 6, characterized in that: The compression spring is sleeved on the limiting rod.

8. The root canal file according to claim 6, characterized in that: The positioning plate is provided with a through hole penetrating along its thickness direction, a pin is provided in the through hole, the limiting rod is provided with a slide groove extending along its axial direction, the pin passes through the slide groove and can move relatively along its extension direction.

9. The root canal file according to claim 8, characterized in that: The side wall of the positioning plate is provided with a through slot passing through the through hole, the width of the through slot is greater than the outer diameter of the limiting rod, and the width of the through slot is smaller than the outer diameter of the compression spring, so that the limiting rod can selectively pass through the through slot.

10. The root canal file according to claim 9, characterized in that: The through slot extends in the radial direction of the positioning plate, and the outer end of the through slot passes through the side wall of the positioning plate.

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