Rotatable gutta-percha needle of gutta-percha filling instrument
By designing a rotatable gutta-percha needle, the problem of limited directional adjustment in traditional gutta-percha filling equipment has been solved, enabling flexible, precise, and efficient gutta-percha filling operations, improving the stability and cleanliness of the equipment, and extending its service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-03-31
AI Technical Summary
Traditional gutta-percha filling equipment has limited directional adjustment, is cumbersome to operate, affects treatment efficiency, is difficult to clean, increases the risk of cross-infection, and the needles are prone to fatigue and breakage, shortening their service life.
A rotatable gutta-percha needle for gutta-percha filling instruments that can rotate freely 360° is designed. Through the combination of a rotating shaft, a damping component and a glue injection needle body, the flexible direction adjustment and stable rotation of the gutta-percha needle are achieved. A rotation damping system is constructed using a limiting protrusion and an elastic locking ring to enhance structural stability.
It enables flexible, precise, and efficient operation of gutta-percha needles, improves treatment efficiency, reduces the risk of cross-infection, extends the service life of the equipment, and has good cleanability and automated assembly capabilities.
Smart Images
Figure CN224056105U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to dental medical instrument technical field, concretely is a rotatable dental cement needle for hot melt dental cement filling instrument used in root canal treatment, especially applicable to the direction flexible adjustment in root canal filling operation. BACKGROUND
[0002] Because the direction adjustment is seriously limited, the operator often needs to spend a lot of time and effort to repeatedly bend the needle body to adjust the glue injection direction, which not only is complicated to operate, but also greatly affects the treatment efficiency; due to the limitation of structural design, cleaning work is difficult to carry out comprehensively and deeply, which easily causes bacteria to remain and increases the risk of cross infection; frequent bending operation can make the needle body bear a large stress, causing the needle body to appear fatigue fracture too early, shortening the service life of the instrument and increasing the medical cost. UTILITY MODEL CONTENT
[0003] Therefore, the utility model provides a rotatable dental cement needle for dental cement filling instrument which can rotate freely by 360 degrees to solve the problem of limited direction adjustment of traditional equipment.
[0004] The utility model discloses a rotatable dental cement needle of dental cement filling instrument, which can rotate freely by 360 degrees.
[0005] A rotatable dental cement needle of dental cement filling instrument, comprising a base, a rotating shaft, a damping assembly and a glue injection needle body; the base is provided with an interface structure connected with the dental cement filling instrument; the base is provided with an installation channel axially through; the rotating shaft is rotatably arranged in the installation channel; the rotating shaft is provided with a limiting protrusion axially limited with the base; the damping assembly comprises a limiting sleeve and an elastic clamping ring arranged on the outer periphery of the rotating shaft; the limiting sleeve axially abuts against the base, and a constraint gap is formed between the inner wall of the limiting sleeve and the rotating shaft; the glue injection needle body is fixed at the center of the rotating shaft and extends through the limiting sleeve; wherein the elastic clamping ring generates a frictional resistance between the base, the rotating shaft and the limiting sleeve through deformation, and constitutes a rotary damping.
[0006] The rotatable dental cement needle of the dental cement filling instrument successfully achieves the function of 360° free rotation, effectively overcomes the limitation problem of traditional equipment in direction adjustment, has many advantages such as simple structure, convenient assembly, convenient operation, long service life and the like, and can flexibly adjust the direction of the bent dental cement needle.
[0007] Specifically, this design is innovative, featuring a unique rotating shaft. This shaft is rotatably connected to the base, securely clamping the injection needle and allowing it to rotate freely with the shaft, thus achieving 360° free rotation. Limiting protrusions on the rotating shaft strictly limit its axial movement range while ensuring free rotation. This method effectively guarantees the stability and reliability of the gutta-percha needle during complex practical operations.
[0008] The flexible retaining ring, as the core component of the damping assembly, plays a crucial role. Through its own elastic deformation, it generates specific frictional resistance between the base, rotating shaft, and limiting sleeve, thus constructing a rotational damping system. This rotational damping system has several significant advantages: First, based on the diverse needs of actual operation, it can provide just the right amount of resistance to the rotation of the rotating shaft, allowing medical personnel to more precisely control the rotation angle when manipulating the gutta-percha needles, effectively avoiding various operational errors caused by excessive rotation; Second, the unique elastic characteristics of the flexible retaining ring, while ensuring sufficient damping effect, can adapt well to different operating forces and frequencies. This characteristic brings a more comfortable and natural operating experience to medical personnel during operation, effectively reducing fatigue and thus significantly improving operational efficiency.
[0009] Preferably, the end base of the rotating shaft extends outward to form a gutta-percha reservoir, and the gutta-percha reservoir is integrally formed with the rotating shaft.
[0010] The gutta-percha reservoir and rotating shaft are integrally molded, eliminating potential gaps and weak points in traditional spliced structures, greatly enhancing the overall structural strength and stability. Most of the gutta-percha reservoir protrudes from the base, a design that greatly facilitates cleaning. Cleaning and sterilization ensure the hygiene of the reservoir and prevent contamination of the gutta-percha. Furthermore, the reservoir is made of aluminum alloy, a material with excellent thermal conductivity, which helps the gutta-percha absorb heat quickly, thus significantly reducing heating time.
[0011] Preferably, the elastic snap ring is an open-type C-shaped spring ring.
[0012] The open design of the C-shaped spring coil gives it excellent elasticity and deformability. During installation, the open structure allows the elastic snap-fit ring to be easily inserted into the annular groove through the assembly window, readily adapting to annular grooves of different sizes, thus improving the product's versatility and interchangeability. Simultaneously, when subjected to external forces, the open C-shaped spring coil can generate a corresponding restoring force through its own elastic deformation, thereby providing stable damping force for the rotation of the shaft.
[0013] Preferably, the elastic snap ring can be replaced with a nut and threadedly connected to the rotating shaft.
[0014] The threaded connection between the nut and the rotating shaft provides a stable and precise fit. Under the influence of complex and variable external forces and frequent rotation operations, it can more effectively maintain the accuracy of the relative position, greatly reducing the instability of equipment operation that may be caused by loosening or displacement, thereby significantly improving the reliability and stability of the entire device during long-term use.
[0015] Preferably, the contact surface between the limiting sleeve and the base is provided with a damping ring, which is made of elastic silicone or rubber.
[0016] The elastic properties of the damping ring also give it the function of adjusting rotational damping. When the rotating shaft rotates, the damping ring undergoes elastic deformation due to compression, thereby generating appropriate friction and providing just the right amount of damping force for the rotation of the shaft. This damping force helps operators to more precisely control the rotational speed and angle of the shaft, avoiding the impact on the accuracy of gutta-percha filling due to excessively fast or slow rotation, thus improving the controllability and precision of the operation.
[0017] Preferably, the rotating shaft has a clamping hole at its center, and the inner wall of the clamping hole has a positioning step surface adapted to the outer diameter of the injection needle. The inner wall of the clamping hole is formed with radial ribs by cold forging, and the outer wall of the injection needle is interference-fitted with the radial ribs to limit axial displacement. In addition to cold forging, the injection needle can also be fixed by applying high-temperature adhesive, which can effectively prevent leakage between the injection needle and the clamping hole, ensuring the sealing and stability of the entire gutta-percha filling system.
[0018] The radial ribs formed by the cold heading process give the inner wall of the clamping hole a unique microstructure, which not only increases the contact area with the outer wall of the injection needle but also enhances the friction between them. The interference fit between the injection needle and the radial ribs ensures a tight connection between the injection needle and the rotating shaft while effectively limiting the axial displacement of the injection needle. During gutta-percha filling, the injection needle needs to withstand certain pressure and impact forces. This interference fit structure ensures that the injection needle remains in the correct position and does not move axially due to external forces, thus guaranteeing the accuracy and stability of the injection.
[0019] Preferably, the outer periphery of the rotating shaft is provided with an annular groove, and the side wall of the limiting sleeve is provided with an assembly window. The assembly window is connected to the constraint gap, and the elastic snap ring is embedded into the annular groove through the assembly window and abuts against the inner wall of the constraint gap.
[0020] The annular groove on the outer circumference of the rotating shaft mates with the assembly window on the side wall of the limiting sleeve, providing clear positioning and guidance for the installation of the elastic snap-fit ring. Through the assembly window, the elastic snap-fit ring can be easily and quickly inserted into the annular groove, greatly simplifying the assembly process and improving production efficiency. At the same time, this design ensures the accuracy and stability of the elastic snap-fit ring's position after installation, allowing it to tightly abut against the inner wall of the constraint gap, thereby effectively exerting its role in generating rotational damping.
[0021] Preferably, the two ends of the installation channel are respectively formed into a first limiting end face and a second assembly end face, the limiting protrusion abuts axially with the first limiting end face, and the limiting sleeve abuts axially with the second assembly end face.
[0022] The first limiting end face abuts axially with the limiting protrusion, precisely defining the axial position of the rotating shaft at one end. This effectively prevents excessive movement of the rotating shaft towards the gutta-percha instrument during rotation, ensuring that the rotating shaft always rotates within a predetermined axial range. This guarantees the relative positional stability between the gutta-percha needle and the gutta-percha instrument, avoiding problems such as loose connections, poor signal transmission, or unstable power transmission caused by shaft displacement, thus ensuring the normal operation of the equipment. The second mounting end face abuts axially with the limiting sleeve, constraining the axial position of the rotating shaft from the other end. As an important component of the damping assembly, the tight abutment between the limiting sleeve and the second mounting end face not only further stabilizes the axial positioning of the rotating shaft but also provides a foundation for the stable operation of the damping assembly. Through this dual axial limiting design, the entire rotatable gutta-percha needle can maintain high structural stability in complex operating environments, effectively improving the reliability and operational accuracy of the equipment.
[0023] The advantages of this utility model compared to the prior art are:
[0024] The rotatable gutta-percha needle of this invention can rotate freely 360°, effectively solving the problem of limited directional adjustment in traditional equipment. It provides more flexible, precise and efficient technical support for gutta-percha filling operations, and has significant innovation and practicality.
[0025] Specifically, to ensure the axial position stability of the rotating shaft during rotation and prevent axial movement from affecting the operating accuracy of the gutta-percha needle, the rotating shaft is equipped with a limiting protrusion that forms an axial limiting fit with the base. This ingenious design of the limiting protrusion, through precise engagement with the base, allows the rotating shaft to rotate freely while strictly limiting its axial movement range, ensuring the stability and reliability of the gutta-percha needle during complex operations and effectively improving operational accuracy. The elastic retaining ring is the key component of the damping assembly. It generates frictional resistance between the base, rotating shaft, and limiting sleeve through its own elastic deformation, thus forming rotational damping. This rotational damping design has multiple advantages. On the one hand, it can provide appropriate resistance to the rotation of the rotating shaft according to actual operational needs, allowing medical personnel to more accurately control the rotation angle when operating the gutta-percha needle and avoid operational errors caused by excessive rotation. On the other hand, the elastic characteristics of the retaining ring can adapt to different operating forces and frequencies while ensuring the damping effect, providing medical personnel with a more comfortable and natural operating feel, effectively reducing operational fatigue and improving operational efficiency. Attached Figure Description
[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 This is a three-dimensional structural diagram of the rotatable gutta-percha needle of a gutta-percha filling instrument according to an embodiment of the present invention.
[0028] Figure 2 This is an exploded view of the rotatable gutta-percha needle of a gutta-percha filling instrument according to an embodiment of the present invention.
[0029] Figure 3 This is a front view of the rotatable gutta-percha needle of a gutta-percha filling instrument according to an embodiment of the present invention.
[0030] Figure 4 This is a cross-sectional view of the rotatable gutta-percha needle of a gutta-percha filling instrument according to an embodiment of the present invention.
[0031] Label Explanation
[0032] Base (1), mounting channel (11), first limiting end face (111), second assembly end face (112), interface structure (12).
[0033] Rotating shaft (2), limiting protrusion (21), gutta-percha reservoir (22), clamping hole (23), radial groove (231), annular slot (24).
[0034] Damping assembly (3), limiting sleeve (31), constraint gap (311), assembly window (312), elastic snap ring (32), damping ring (33).
[0035] Injection needle body (4). Detailed Implementation
[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0037] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0038] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of this application, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0040] The technical solutions in this application will now be described with reference to the accompanying drawings.
[0041] This embodiment provides a rotatable gutta-percha needle for a gutta-percha filling instrument, including a base 1, a rotating shaft 2, a damping assembly 3, and a glue injection needle body 4. The base 1 has an interface structure 12 for connecting to the gutta-percha filling instrument and an axially penetrating mounting channel 11. The rotating shaft 2 is rotatably inserted into the mounting channel 11 and has a limiting protrusion 21 that forms an axial limiting fit with the base 1. The damping assembly 3 includes a limiting sleeve 31 and an elastic retaining ring 32 sleeved on the outer periphery of the rotating shaft 2. The limiting sleeve 31 axially abuts against the base 1, and its inner wall forms a limiting sleeve 311 with the rotating shaft 2. The glue injection needle body 4 is fixed to the center of the rotating shaft 2 and extends through the limiting sleeve 31. The elastic retaining ring 32 generates frictional resistance between the base 1, the rotating shaft 2, and the limiting sleeve 31 through deformation, thus constituting rotational damping.
[0042] The rotatable gutta-percha needles of the gutta-percha filling instrument involved in this solution successfully achieve 360° free rotation, effectively overcoming the limitations of traditional equipment in terms of direction adjustment. They also possess numerous advantages such as simple structure, easy assembly, convenient operation, and long service life, and can flexibly adjust the direction of the bent needles. Furthermore, the rotatable gutta-percha needles have a scientifically sound and reliable structural design, effectively preventing gutta-percha overflow, are easy to assemble, and are feasible for large-scale automated assembly.
[0043] Specifically, this design is innovative, featuring a unique rotating shaft. This shaft is rotatably connected to the base, securely clamping the injection needle and allowing it to rotate freely with the shaft, thus achieving 360° free rotation. Limiting protrusions on the rotating shaft strictly limit its axial movement range while ensuring free rotation. This method effectively guarantees the stability and reliability of the gutta-percha needle during complex practical operations.
[0044] The flexible retaining ring, as the core component of the damping assembly, plays a crucial role. Through its own elastic deformation, it generates specific frictional resistance between the base, rotating shaft, and limiting sleeve, thus constructing a rotational damping system. This rotational damping system has several significant advantages: First, based on the diverse needs of actual operation, it can provide just the right amount of resistance to the rotation of the rotating shaft, allowing medical personnel to more precisely control the rotation angle when manipulating the gutta-percha needles, effectively avoiding various operational errors caused by excessive rotation; Second, the unique elastic characteristics of the flexible retaining ring, while ensuring sufficient damping effect, can adapt well to different operating forces and frequencies. This characteristic brings a more comfortable and natural operating experience to medical personnel during operation, effectively reducing fatigue and thus significantly improving operational efficiency.
[0045] In this embodiment, the end of the rotating shaft 2 extends outward toward the base to form a gutta-percha reservoir 22, which is integrally formed with the rotating shaft 2.
[0046] The gutta-percha reservoir 22 is integrally molded with the rotating shaft 2, eliminating potential gaps and weak points in traditional spliced structures and greatly enhancing the overall structural strength and stability. Most of the gutta-percha reservoir protrudes from the base, a design that greatly facilitates cleaning. Cleaning and sterilization ensure the hygiene of the reservoir and prevent contamination of the gutta-percha. Furthermore, the reservoir is made of aluminum alloy, a material with excellent thermal conductivity, which helps the gutta-percha absorb heat quickly, thus significantly shortening the heating time.
[0047] In this embodiment, the elastic snap ring 32 is an open C-shaped spring coil.
[0048] The open design of the C-shaped spring coil gives it good elasticity and deformability. During installation, the open structure facilitates the insertion of the elastic snap ring 32 into the annular slot 24 through the assembly window 312, easily adapting to annular slots 24 of different sizes, thus improving the product's versatility and interchangeability. Simultaneously, when subjected to external forces, the open C-shaped spring coil can generate a corresponding restoring force through its own elastic deformation, thereby providing stable damping force for the rotation of the rotating shaft 2.
[0049] In other embodiments, the resilient snap ring can be replaced with a nut, which is threadedly connected to the rotating shaft.
[0050] The threaded connection between the nut and the rotating shaft provides a stable and precise fit. Under the influence of complex and variable external forces and frequent rotation operations, it can more effectively maintain the accuracy of the relative position, greatly reducing the instability of equipment operation that may be caused by loosening or displacement, thereby significantly improving the reliability and stability of the entire device during long-term use.
[0051] In this embodiment, the two ends of the mounting channel 11 are respectively formed with a first limiting end face 111 and a second assembly end face 112. The limiting protrusion 21 abuts axially with the first limiting end face 111, and the limiting sleeve 31 abuts axially with the second assembly end face 112.
[0052] The first limiting end face 111 axially abuts against the limiting protrusion 21, precisely defining the axial position of the rotating shaft 2 at one end. This effectively prevents the rotating shaft 2 from excessively moving towards the gutta-percha instrument during rotation, ensuring that the rotating shaft 2 always rotates within a predetermined axial range. This guarantees the relative positional stability between the gutta-percha needle and the gutta-percha instrument, avoiding problems such as loose connections, poor signal transmission, or unstable power transmission caused by the displacement of the rotating shaft 2, thus ensuring the normal operation of the equipment. The second assembly end face 112 axially abuts against the limiting sleeve 31, thus constraining the axial position of the rotating shaft 2 from the other end. As an important component of the damping assembly 3, the tight abutment between the limiting sleeve 31 and the second assembly end face 112 not only further stabilizes the axial positioning of the rotating shaft 2 but also provides a foundation for the stable operation of the damping assembly 3. Through this dual axial limiting design, the entire rotatable gutta-percha needle can maintain high structural stability in complex operating environments, effectively improving the reliability and operational accuracy of the equipment.
[0053] In this embodiment, a damping ring 33 is provided on the contact surface between the limiting sleeve 31 and the base 1. The damping ring 33 is made of elastic silicone or rubber.
[0054] The elastic properties of the damping ring 33 also enable it to adjust rotational damping. When the rotating shaft 2 rotates, the damping ring 33 undergoes elastic deformation due to compression, generating appropriate friction and providing just the right amount of damping force for the rotation of the rotating shaft 2. This damping force helps the operator to more precisely control the rotational speed and angle of the rotating shaft 2, avoiding the impact on the accuracy of gutta-percha filling due to excessively fast or slow rotation, thus improving the controllability and precision of the operation.
[0055] In this embodiment, the center of the rotating shaft 2 is provided with a clamping hole 23. The inner wall of the clamping hole 23 is provided with a positioning stepped surface that matches the outer diameter of the injection needle body 4. The inner wall of the clamping hole 23 is formed with radial ribs by a cold forging process. The outer wall of the injection needle body 4 is interference-fitted with the radial ribs to limit axial displacement. In addition to the cold forging process, in other embodiments, the injection needle body can also be fixed by applying high-temperature adhesive, which can effectively prevent leakage between the injection needle body and the clamping hole, and ensure the sealing and stability of the entire gutta-percha filling system.
[0056] The radial ribs formed by the cold heading process give the inner wall of the clamping hole 23 a unique microstructure. This leaves a radial groove 231 on the outer wall of the rotating shaft 2, which not only increases the contact area with the outer wall of the injection needle 4 but also enhances the friction between them. The interference fit between the injection needle 4 and the radial ribs ensures a tight connection between the injection needle 4 and the rotating shaft 2 while effectively limiting the axial displacement of the injection needle 4. During gutta-percha filling, the injection needle 4 needs to withstand certain pressure and impact forces. This interference fit ensures that the injection needle 4 remains in the correct position and does not move axially due to external forces, thus guaranteeing the accuracy and stability of the injection.
[0057] In this embodiment, the outer periphery of the rotating shaft 2 is provided with an annular groove 24, and the side wall of the limiting sleeve 31 is provided with an assembly window 312. The assembly window 312 is connected to the constraint gap 311. The elastic snap ring 32 is embedded into the annular groove 24 through the assembly window 312 and abuts against the inner wall of the limiting sleeve 311.
[0058] The annular groove 24 on the outer circumference of the rotating shaft 2 cooperates with the assembly window 312 on the side wall of the limiting sleeve 31, providing clear positioning and guidance for the installation of the elastic snap-fit ring 32. Through the assembly window 312, the elastic snap-fit ring 32 can be easily and quickly embedded into the annular groove 24, greatly simplifying the assembly process and improving production efficiency. At the same time, this design ensures the accuracy and stability of the elastic snap-fit ring 32's position after installation, allowing it to tightly abut against the inner wall of the limiting sleeve 311, thereby effectively exerting its role in generating rotational damping.
[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A rotatable gutta-percha needle of a gutta-percha filling instrument, characterized in that, The utility model relates to a rotary damping device for dental rubber filling instrument, including: The base (1) is equipped with the interface structure (12) connected with dental rubber filling instrument, the base (1) is equipped with the installation channel (11) that passes through axially, Rotary shaft (2) rotatably passes in the installation channel (11), the rotary shaft (2) is equipped with the limit protruding (21) with the axial limit cooperation of base (1), Damping assembly (3) including the limit sleeve (31) of the outer periphery of rotary shaft (2) and elastic clamping ring (32), the limit sleeve (31) with base (1) axial abutment, its inner wall and rotary shaft (2) between form the constraint clearance (311), Injection glue needle body (4) is fixed in rotary shaft (2) center and extends through the limit sleeve (31), Wherein, the elastic clamping ring (32) generates the friction resistance between base (1) and rotary shaft (2) and limit sleeve (31) through deformation, constitutes rotary damping.
2. The rotatable gutta-percha needle of claim 1, wherein, The end of rotary shaft (2) extends towards the base and forms a dental rubber storage (22), which is integrally formed with the rotary shaft (2).
3. The rotatable gutta-percha needle of claim 1, wherein, The elastic clamping ring (32) is an open C-shaped spring ring.
4. The rotatable gutta-percha needle of claim 1, wherein, The elastic clamping ring can be replaced with a nut and is threadedly connected with the rotary shaft (2).
5. The rotatable gutta-percha needle of claim 1, wherein, The abutting surface of the limit sleeve (31) and the base (1) is provided with a damping ring (33) made of elastic silicone or rubber material.
6. The rotatable gutta-percha needle of claim 1, wherein, The center of the rotary shaft (2) is provided with a clamping hole (23), the inner wall of the clamping hole (23) is provided with a positioning step surface matched with the outer diameter of the injection glue needle body (4), the inner wall of the clamping hole (23) is formed with a radial rib by cold heading process, and the outer wall of the injection glue needle body (4) is in interference fit with the radial rib to limit axial displacement.
7. The rotatable gutta-percha needle of claim 1, wherein, The center of the rotary shaft (2) is provided with a clamping hole (23), the inner wall of the clamping hole (23) is provided with a positioning step surface matched with the outer diameter of the injection glue needle body (4), the clamping hole (23) and the injection glue needle body (4) can be fixed by high temperature glue.
8. The rotatable gutta-percha needle of claim 1, wherein, The two ends of the installation channel (11) form a first limiting end face (111) and a second assembly end face (112), respectively, the limiting protrusion (21) axially abuts against the first limiting end face (111), and the limit sleeve (31) axially abuts against the second assembly end face (112).
9. The rotatable gutta-percha needle of claim 1, wherein, The outer periphery of the rotary shaft (2) is provided with an annular clamping groove (24), the side wall of the limit sleeve (31) is provided with an assembly window (312), the assembly window (312) is communicated to the constraint clearance (311), and the elastic clamping ring (32) is embedded in the annular clamping groove (24) through the assembly window (312) and abuts against the inner wall of the constraint clearance (311).