Handle detachable root canal file

Abstract

The utility model relates to oral cavity medical instrument technical field, concretely discloses a handle rod easy to disassemble's root canal file, including handle, rod and blade, the rod and blade fixed connection, the one end of handle is equipped with the assembly jack for inserting the rod, the outer thread is arranged on the handle outer circumferential surface at assembly jack position, and the handle end portion at the position of the outer thread is formed with a plurality of independent and elastic arc lock pieces through a plurality of circumferential uniform and radial divergence incisions, the handle is provided with the lock nut that acts with the outer thread to limit a plurality of arc lock pieces, the utility model discloses a root canal file can make the handle and the rod between the assembly of root canal file more simple and convenient, can independently replace the file blade, has reduced the medical cost of the whole root canal file of each replacement.

Description

Technical Field

[0001] This utility model relates to the field of oral medical device technology, and specifically discloses a root canal file with an easily detachable handle. Background Technology

[0002] Root canal files are a core instrument in root canal treatment, used for preparing, cleaning, and shaping root canals. Existing root canal files mainly consist of a blade, a shaft, and a shank. The blade is a tapered, thin rod with helical cutting edges on the tapered surface. The shaft and blade are usually machined from a single piece of nickel-titanium alloy, while the shank is made of stainless steel or other metals. An insertion hole is located at one end of the shank for interaction with the shaft. During the preparation of the root canal file, the shaft and the insertion hole on the shank are mechanically press-fitted together.

[0003] For example, invention patent application number 202410731915.3 discloses a root canal file and a root canal file processing device. This root canal file consists of a blade, a shaft, and a handle, with the shaft and handle mechanically press-fitted together to achieve a fixed connection between the blade and shaft. However, during root canal treatment, the blade of the root canal file is prone to breakage due to its material and shape design. Once the blade is damaged and unusable, it is difficult for medical personnel to pull the file blade (i.e., the blade and shaft as a whole) from the handle due to the mechanical press-fitting between the handle and shaft, thus requiring the replacement of a new root canal file, which leads to excessively high instrument costs for root canal treatment. Based on this, and addressing the shortcomings of existing root canal files where the mechanical press-fitting between the file blade and handle makes separation difficult, this application proposes a root canal file with an easily detachable handle and shaft that effectively solves the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this utility model is to provide a root canal file with an easily detachable handle, in order to solve the technical problems and shortcomings of existing root canal files where the file blade and handle are mechanically pressed together, making it difficult to disassemble the two and impossible to replace the file blade independently.

[0005] This utility model is achieved through the following technical solution: A root canal file with an easily detachable handle includes a handle body, a shaft body, and a cutting edge. The shaft body and the cutting edge are fixedly connected. One end of the handle body has an assembly hole for inserting the shaft body. An external thread is provided on the outer circumferential surface of the handle body at the assembly hole position. The end of the handle body at the position of the external thread has multiple independent and elastic arc-shaped locking pieces formed by multiple circumferentially uniform and radially diverging cuts. A locking nut is provided on the handle body to interact with the external thread and limit the multiple arc-shaped locking pieces.

[0006] As a further feature of the above scheme, a positioning groove is provided on the inner surface of each of the arc-shaped locking pieces, and a plurality of protrusions that interact with the positioning groove are evenly provided on the outer circular surface of the end of the handle that is inserted into the assembly hole.

[0007] As a further feature of the above scheme, the end of the handle at the location of the external thread is divided into four arc-shaped locking pieces by a cross-shaped opening, and four protrusions are evenly arranged circumferentially on the outer circular surface of the end of the handle that is inserted into the assembly hole.

[0008] As a further feature of the above solution, a flat opening for connection to the root canal motor is provided at the end of the handle on the side away from the mounting hole.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The root canal file disclosed in this utility model features a cross-shaped opening in the mounting hole, forming multiple evenly arranged and elastic arc-shaped locking plates. An external thread is then provided on the outer circumferential surface of the handle, and a locking nut is connected via this thread. When the file body needs to be inserted, the locking nut can be removed from the external thread position, allowing the multiple arc-shaped locking plates to open radially outward under elastic action, making the insertion and removal of the file body simpler and less strenuous. When locking is required, the locking nut is screwed into the external thread position, causing the multiple arc-shaped locking plates to contract towards the center, thereby pressing and fixing the file body. The overall structural design of the root canal file makes the assembly between the handle and the file body simpler and more convenient, allowing for independent replacement of the file body, thus reducing the medical cost of replacing the entire root canal file each time.

[0010] 2. Furthermore, this utility model provides a positioning groove on the inner surface of the arc-shaped locking piece and a protrusion on the outer circular surface of the rod insertion end. During the insertion process of the handle and the rod, the positioning groove and the protrusion can prevent the file blade from slipping off the assembly hole or rotating relative to it during subsequent use, thus ensuring the assembly stability of the entire root canal file. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the handle and locking nut in this utility model; Figure 3 This is a three-dimensional structural diagram of the handle body in this utility model; Figure 4 This is a three-dimensional structural diagram of the rod and blade in this utility model. Detailed Implementation

[0013] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-4 This application will be described in detail with reference to the embodiments. Example 1

[0015] Example 1 discloses a root canal file with an easily detachable handle, see attached document. Figures 1-4 It includes a handle 10, a rod 20, and a cutting edge 30. The rod 20 and the cutting edge 30 are integrally machined from nickel-titanium alloy or stainless steel. The cutting edge 30 has a tapered shape and a spiral cutting edge on the tapered surface. The rod 20 is integrally formed with the rough end of the cutting edge 30, either as a straight cylinder or a stepped cylinder.

[0016] The handle 10 is made of stainless steel or flexible steel, and its overall shape is a straight cylinder or a stepped cylinder. The diameter of the handle 10 is larger than the diameter of the rod 20. One end of the handle 10 is provided with a flat opening 101 for easy connection with a root canal motor (not shown in the figure), and the other end face is concentrically provided with a mounting hole 102 with an inner diameter equal to or slightly larger than the outer diameter of the rod 20.

[0017] An external thread 103 is provided on the outer circumference of the handle 10 at the corresponding position of the mounting hole 102, and a cross-shaped opening 104 extending axially toward the flat opening 101 is provided at the open end of the mounting hole 102. Under the dividing action of the cross-shaped opening 104, four independent and elastic arc-shaped locking pieces 105 are formed at the end of the handle 10 with the external thread 103. Of course, the cross-shaped opening 104 can be replaced by multiple circumferentially uniform and radially diverging cuts of other shapes, so as to form multiple independent and elastic arc-shaped locking pieces 105 at the end of the handle 10 with the external thread 103.

[0018] A locking nut 40 is fitted on the handle 10, and the locking nut 40 is adapted to the external thread 103 on the handle 10, so that when the locking nut 40 is pushed to one end of the external thread 103, the locking nut 40 can be rotated to make its threaded connection to the outer circle surface of the handle 10 at the position of the external thread 103.

[0019] Finally, in order to ensure the connection stability between the rod body 20 and the handle body 10, in this embodiment 1, four protrusions 201 are evenly provided on the outer circular surface of the rod body 20 at the position where it interacts with the mounting hole 102, and a positioning groove 106 that matches the protrusion 201 is provided on the inner surface of each arc-shaped locking piece 105.

[0020] When the root canal file disclosed in Embodiment 1 needs to have its file body (i.e., the overall structure of the shaft 20 and the blade 30) replaced, a wrench or other tool can be used to rotate the locking nut 40, causing the locking nut 40 to move from the side near the shaft 20 toward the flat end 101 until the locking nut 40 separates from the external thread 103. Because the four arc-shaped locking pieces 105 have a certain degree of elasticity after separation, the user can pull the file body out of the mounting hole 102 without using significant external force.

[0021] Next, when installing the new file body, directly insert the end of the rod 20 on the file body into the mounting hole 102. Then rotate the file body so that the protrusion 201 on the rod 20 engages with the positioning groove 106 on the arc-shaped locking piece 105 to position the rod 20. Finally, use a wrench or other tools to turn the locking nut 40 in the opposite direction. Under the action of the external thread 103, the locking nut 40 will move to the end of the handle 10 with the external thread 103. The locking nut 40 locks the four arc-shaped locking pieces 105, preventing the file body from slipping off the mounting hole 102 or rotating relative to it during subsequent use, thus ensuring the assembly stability of the entire root canal file.

[0022] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A root canal file with an easily detachable handle and shaft, comprising a handle body, a shaft body, and a cutting edge, wherein the shaft body and the cutting edge are fixedly connected, and one end of the handle body has an assembly hole for inserting the shaft body, characterized in that, The outer circumferential surface of the handle located at the assembly insertion hole is provided with an external thread, and the end of the handle at the location of the external thread is formed by multiple independent and elastic arc-shaped locking pieces through multiple circumferentially uniform and radially diverging cuts. The handle is provided with a locking nut that interacts with the external thread to limit the multiple arc-shaped locking pieces.

2. The root canal file with an easily detachable handle according to claim 1, characterized in that, Each of the arc-shaped locking pieces has a positioning groove on its inner surface, and the outer circular surface of the end of the handle that is inserted into the assembly hole has a plurality of protrusions that interact with the positioning groove evenly arranged in a circumferential direction.

3. The root canal file with an easily detachable handle according to claim 2, characterized in that, The end of the handle with the external thread is divided into four arc-shaped locking pieces by a cross-shaped opening, and four protrusions are evenly arranged on the outer circumferential surface of the end of the handle that is inserted into the assembly hole.

4. The root canal file with an easily detachable handle according to claim 1, characterized in that, The end of the handle, away from the mounting hole, has a flat opening for connection with the root canal motor.

Images