Root canal therapy device in ultrasonic vibration and rotation dual-drive mode

Abstract

The invention discloses a root canal therapy device in an ultrasonic vibration and rotation dual-drive mode. The root canal therapy device comprises a machine head assembly, an ultrasonic transducer assembly and a rotating motor assembly. The machine head assembly comprises a machine head shell, and a center gear is arranged in the machine head shell. The central gear is clamped and fixed between the upper-end mandrel and the lower-end mandrel, and the lower-end mandrel is used for fixing a root canal file through a root canal file fixing component; the ultrasonic transducer assembly comprises piezoelectric ceramics, the piezoelectric ceramics are clamped between an amplitude-change pole and a rear mass block, the amplitude-change pole is provided with a hollow channel, the front end of the amplitude-change pole is connected with a locking rod, and the locking rod is connected with the machine head assembly through a locking connecting piece; the rotating motor assembly comprises a rotating motor, a coupler and a rotating shaft, the rotating shaft penetrates through the hollow channel and extends into the machine head assembly, and the tail end of the rotating shaft is meshed with the center gear. According to the technical scheme, a rotation and ultrasonic vibration dual-drive motion mode is achieved, a contamination layer is avoided, and the root canal preparation quality and efficiency are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oral medical instruments, and particularly relates to a root canal treatment device of ultrasonic vibration plus rotation dual driving mode. BACKGROUND

[0002] As a preferred treatment method for dental pulp disease and periapical disease, the core goal of root canal treatment is to achieve the biological goal of controlling the microbial environment and healing the periapical tissue by removing the infected substances in the root canal and tightly sealing the root canal system. The success of modern root canal treatment depends on the trinity technical concept of "removing infection, tightly filling, and preventing reinfection".

[0003] Traditional root canal preparation techniques mainly include two categories of manual instrument preparation and machine nickel-titanium system preparation, and each of the two categories has limitations. Manual instrument preparation usually adopts stainless steel K file and step-by-step retreatment method, and the fundamental defect is the mismatch between the physical characteristics of the instrument and the anatomical shape of the root canal. The high rigidity and low elasticity of the stainless steel material make the instrument produce a rebound force after entering the curved root canal. This rebound force, as an additional cutting force, uncontrollably cuts the concave wall near the tip of the curved root canal and the convex wall at the curved part, resulting in the opening of the root tip hole, the formation of steps, and the deviation of the root canal. This morphological change not only destroys the natural closure of the narrow area of the root tip, but also weakens the root canal wall fracture strength, increases the risk of postoperative pain and root longitudinal crack. When the root canal instrument of the machine nickel-titanium system preparation is used for root canal preparation by a rotary root canal treatment machine, a 1-5 micron thick smear layer is often formed on the root canal wall, which is composed of dentin debris, solidified organic matter and microorganisms, blocks the opening of the dentin tubules, and hinders the entry of disinfectants. Due to the presence of the smear layer during root canal preparation, the failure rate of treatment is often increased and the complications are increased, which directly affects the treatment effect. SUMMARY

[0004] In view of the above technical problems, the present application discloses a root canal treatment device of ultrasonic vibration plus rotation dual driving mode, which realizes the rotation and ultrasonic vibration dual driving motion mode of the root canal file instrument during root canal preparation, avoids the generation of the smear layer, and significantly improves the quality and efficiency of root canal preparation.

[0005] To this end, the technical scheme adopted by the present application is as follows:

[0006] A root canal treatment device of ultrasonic vibration plus rotation dual driving mode, comprising a handpiece assembly, an ultrasonic transducer assembly and a rotary motor assembly connected in sequence;

[0007] The handpiece assembly comprises a hollow handpiece shell, a center gear, an upper end shaft and a lower end shaft are arranged in the handpiece shell; the center gear is clamped and fixed between the upper end shaft and the lower end shaft, and is in fixed fit with the upper end shaft and the lower end shaft; the lower end shaft is fixed with a root canal file through a root canal file fixing member.

[0008] The ultrasonic transducer assembly comprises piezoelectric ceramics, a variable amplitude rod, a locking rod and a back mass, the piezoelectric ceramics is clamped between the variable amplitude rod and the back mass, the variable amplitude rod is a hollow structure and is provided with a hollow channel; the front end of the variable amplitude rod is connected with the locking rod, the locking rod is connected with the handpiece assembly through a locking connector, and the handpiece assembly and the ultrasonic assembly are connected. The piezoelectric ceramics can deform under the action of pressure, thereby causing polarization of the piezoelectric ceramics itself, and positive and negative bound charges appear on the surface of the piezoelectric ceramics. This effect is the piezoelectric effect. The piezoelectric effect is reversible, that is, the piezoelectric ceramics will deform after a voltage is applied. This inverse piezoelectric effect can generate ultrasonic waves. The mass mainly serves to balance the mass at the front and back ends of the piezoelectric ceramics, ensuring the optimal state of the piezoelectric transducer; the variable amplitude rod is a functional component that changes the amplitude of ultrasonic vibration in cooperation with the piezoelectric ceramics, and mainly serves to change the amplitude of the piezoelectric ceramics, improve the vibration speed ratio, improve the efficiency and improve the mechanical quality factor.

[0009] The rotary motor assembly comprises a rotary motor, a shaft coupling and a rotary shaft connected in sequence; the rotary shaft passes through the hollow channel and extends into the handpiece assembly, and the tail end is engaged with the central gear through a torque input shaft to drive the handpiece to rotate;

[0010] The ultrasonic transducer assembly transmits axial ultrasonic vibration to the handpiece assembly; the rotary motor assembly drives the central gear to rotate the root canal file; and independent or cooperative work of ultrasonic vibration mode, rotation mode and double-drive mode is realized.

[0011] By adopting the technical scheme, the ultrasonic transducer assembly is used to generate vibration pulses, a voltage is applied to the piezoelectric ceramics, so that the piezoelectric ceramics deforms and vibrates, and ultrasonic waves are generated at the same time. Since the locking connector in the handpiece assembly is connected with the locking rod in the ultrasonic transducer assembly, the handpiece shell is connected with the ultrasonic variable amplitude rod and the ultrasonic wave output end, so that the driving power of the piezoelectric ceramics can be transmitted to the handpiece assembly through the locking rod at the front end, the handpiece assembly is synchronized with ultrasonic vibration, and finally the root canal file generates axial ultrasonic vibration. On the other hand, the rotary motion of the rotary motor assembly is transmitted to the root canal file in sequence through the shaft coupling, the rotary shaft, the torque input shaft and the central gear, so that the root canal file generates rotary motion. The two motion modes can be implemented independently or jointly. The device advantageously combines vibration and rotary motion, so that cutting or drilling is more efficient.

[0012] As a further improvement of the present application, the handpiece assembly comprises an upper end bearing and a lower end bearing, the upper end shaft and the lower end shaft are respectively provided with a bearing mounting seat on one side, and the upper end bearing and the lower end bearing are respectively mounted on the bearing mounting seat of the upper end shaft and the lower end shaft; one end of the upper end bearing and the lower end bearing is respectively provided with an upper pressing ring and a lower pressing ring, and the upper pressing ring and the lower pressing ring are fixedly connected with the handpiece shell, so that the center gear, the upper end shaft, the lower end shaft, the upper end bearing and the lower end bearing are fixed in the handpiece shell, and the center gear can rotate in the handpiece shell.

[0013] As a further improvement of the present application, the root canal file fixing member comprises a locking cap, the lower end shaft is provided with a hole for mounting the root canal file, which facilitates the mounting of the root canal file, and the lower end of the lower end shaft is threadedly connected with the locking cap to fix the root canal file. Further, the lower end of the lower end shaft is provided with an external thread, and the hole is matched with an internal thread of the locking cap to fix the root canal file.

[0014] As a further improvement of the present application, the locking connector is located at the tail of the handpiece shell, and the locking connector is threadedly connected with the locking rod. Further, the locking connector is provided with an internal thread, and the locking connector is matched with an external thread of the locking rod.

[0015] As a further improvement of the present application, the torque input shaft is located outside the handpiece shell, and the periphery of the torque input shaft is covered by the handpiece shell.

[0016] As a further improvement of the present application, the rotating shaft comprises two stages, one stage is installed in the interior of the ultrasonic transducer assembly, and the other stage is installed in the interior of the handpiece assembly, the two stages of the rotating shaft are meshed with each other through the rotating gears at the ends of the stages to transmit torque, and each stage of the rotating shaft is provided with a copper bushing support to replace the bearing to ensure the normal work of the rotating shaft. When the rotating motor works, the two stages of the rotating shaft are driven to move synchronously, and finally the torque input shaft drives the center gear in the handpiece assembly to move synchronously, at this time, the root canal file in the handpiece assembly also rotates with the center gear.

[0017] As a further improvement of the present application, the rear mass is provided with a hollow channel for the rotating shaft to pass through.

[0018] As a further improvement of the present application, the locking rod is internally provided with a gear space for accommodating the rotating gear.

[0019] As a further improvement of the present application, the piezoelectric ceramic comprises two groups of symmetrically arranged piezoelectric ceramic sheets, and axial ultrasonic wave vibration is generated through the inverse piezoelectric effect.

[0020] As a further improvement of the present application, the head shell is pre-bent at an angle to enable the ultrasonic vibration to generate an approximately axial impact motion when transmitted to the root canal file.

[0021] As a further improvement of the present application, the ultrasonic vibration plus rotation dual-drive mode root canal treatment device comprises a power module and a control board, and the piezoelectric ceramic and the rotary motor are electrically connected to the power module and the control board, respectively.

[0022] The present application discloses an operation method of the ultrasonic vibration plus rotation dual-drive mode root canal treatment device as described above, comprising the following modes:

[0023] a) ultrasonic vibration mode: only start the ultrasonic transducer assembly to enable the root canal file to generate an axial impact motion;

[0024] b) rotation mode: only start the rotary motor assembly to enable the root canal file to continuously rotate;

[0025] c) dual-drive mode: simultaneously start the ultrasonic transducer assembly and the rotary motor assembly to enable the root canal file to simultaneously perform axial ultrasonic vibration and rotation motion.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] The technical scheme of the present application realizes the rotation and ultrasonic vibration dual-drive motion mode of the root canal file instrument during root canal preparation, and the entire device is small in size, i.e., both the efficient cutting of the instrument on the root canal wall and the additional mechanical vibration effectively reduce the cutting resistance and cutting temperature, thereby avoiding the generation of a smear layer and significantly improving the quality and efficiency of root canal preparation. In addition, the device is compact in structure, strong in adaptability, controllable in vibration frequency, and adjustable in vibration impact force, can effectively improve the chip removal capacity of the drilling tool, reduce the cutting resistance and cutting temperature, effectively improve the surface quality of deep hole machining, and prolong the service life of the drilling tool; can be applied to deep hole drilling machining, and can also be applied to the connection and driving of medical instruments such as orthopedics and dentistry. Specifically, the advantages of the present application further include the following points:

[0028] Firstly, the ultrasonic vibration and rotation dual-drive mode of the technical scheme of the present application adds high-frequency reciprocating motion at the interface between the instrument and the root canal, avoids continuous static extrusion of the root canal file on the root canal, enables the root canal file and the root canal to continuously generate "disengagement contact", greatly reduces the average friction coefficient, and thus reduces the driving torque and energy consumption required by the rotation motion.

[0029] Second, the ultrasonic vibration and rotation double drive mode of the technical scheme of the present application reduces friction compared with the original single rotation mode, so that greater effective cutting force and feed force can be applied during use. At the same time, the high-frequency impact brought by ultrasonic vibration helps to break the chips and soften the material.

[0030] Third, the ultrasonic vibration and rotation double drive mode of the technical scheme of the present application effectively reduces the deformation of the workpiece and the lower cutting temperature, avoids the heat in the root canal preparation process causing patient discomfort, and in addition, the ultrasonic vibration helps to obtain a root canal inner wall with high surface quality and avoid the generation of a contaminated layer. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The structure schematic diagram of a root canal treatment device of an ultrasonic vibration plus rotation double drive mode according to an embodiment of the present application.

[0032] Figure 2 The sectional view schematic diagram of a root canal treatment device of an ultrasonic vibration plus rotation double drive mode according to an embodiment of the present application.

[0033] Figure 3 The structure schematic diagram of a handpiece assembly according to an embodiment of the present application; wherein (a) is the external schematic diagram of the handpiece assembly, and (b) is the internal structure schematic diagram of the handpiece assembly.

[0034] Figure 4 The exploded structure schematic diagram of a handpiece assembly according to an embodiment of the present application.

[0035] Figure 5 The structure schematic diagram of an ultrasonic transducer assembly and a rotation assembly according to an embodiment of the present application; wherein (a) is the external schematic diagram of the ultrasonic transducer assembly and the rotation assembly, and (b) is the internal structure schematic diagram of the ultrasonic transducer assembly and the rotation assembly.

[0036] Figure 6 The connection structure schematic diagram of a rotation assembly according to an embodiment of the present application.

[0037] Figure 7 The working motion mode schematic diagram of a root canal treatment device of an ultrasonic vibration plus rotation double drive mode according to an embodiment of the present application.

[0038] The reference signs include:

[0039] 100 - handpiece assembly, 101 - handpiece shell, 102 - upper compression ring, 103 - lower compression ring, 104 - upper end bearing, 105 - lower end bearing, 106 - central gear, 107 - upper end spindle, 108 - lower end spindle, 109 - locking connector, 110 - root canal file, 111 - locking cap;

[0040] 200 - ultrasonic transducer assembly, 201 - locking rod, 202 - amplitude horn, 203 - piezoelectric ceramic, 204 - back mass;

[0041] 300 - rotating assembly, 301 - rotating motor, 302 - coupling, 303 - rotating shaft, 304 - torque input shaft, 305 - copper sleeve. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present application are described in further detail below.

[0043] As shown in Figure 1 and Figure 2 , an ultrasonic vibration and rotation dual driving mode root canal treatment device, comprising a handle assembly 100, an ultrasonic transducer assembly 200 and a rotating motor assembly 300.

[0044] As shown in Figure 3 and Figure 4 , the handle assembly 100 comprises a handle shell 101, an upper pressure ring 102, a lower pressure ring 103, an upper end bearing 104, a lower end bearing 105, a center gear 106, an upper end spindle 107, a lower end spindle 108, a locking connector 109, a root canal file 110 and a locking cap 111. The handle shell 101 is hollow inside and has a rotatable center gear 106 inside; the upper end and the lower end of the center gear 106 are provided with an upper end spindle 107 and a lower end spindle 108, respectively, and the upper end spindle 107 and the lower end spindle 108 sandwich the center gear 106 at the center position inside the handle shell 101; the upper end spindle 107 and the lower end spindle 108 are both provided with bearing mounting seats, which are respectively provided with an upper end bearing 104 and a lower end bearing 105, and one end of the upper end bearing 104 and the lower end bearing 105 is respectively provided with an upper pressure ring 102 and a lower pressure ring 103, which integrally encapsulate and fix the upper end bearing 104 and the lower end bearing 105 with the center gear 106 inside the handle shell 101, so that the center gear 106 can rotate and move inside the handle shell 101. In addition, the center of the lower end spindle 108 is provided with a hole for mounting the root canal file 110, which facilitates the installation of the root canal file 110; the lower end of the lower end spindle 108 is provided with external threads for use in cooperation with the internal threads of the locking cap 111 to fix the root canal file 110. The outside of the handle shell 101 is provided with a torque input shaft 304, which engages with the center gear 106 to drive the internal components of the handle to rotate and move; the torque input shaft 304 is covered inside the handle shell 101, and the tail of the handle shell 101 is provided with a locking connector 109, which is internally threaded and hollow, and its internal threads cooperate with the external threads of the locking rod 201 of the ultrasonic transducer assembly 200 to connect the handle assembly 100 and the ultrasonic assembly 200 together. The handle assembly 100 is provided with a certain bending angle, and the axis of the locking connector 109 is perpendicular to the axis of the rotating gear.

[0045] As Figure 5 shown, the ultrasonic transducer assembly 200 includes a locking rod 201, a variable amplitude rod 202, a piezoelectric ceramic 203, and a mass block 204. Among them, the piezoelectric ceramic 203 is used in pairs, and the piezoelectric ceramic 203 can generate ultrasonic vibration under voltage excitation; the front end of the piezoelectric ceramic 203 is provided with the variable amplitude rod 202, and the rear end is provided with the mass block 204. The variable amplitude rod 202 and the mass block 204 lock the piezoelectric ceramic 203 between them; the mass block 204 is mainly used to balance the mass of the piezoelectric ceramic 203 at the front and rear ends, to ensure the optimal state of the piezoelectric transducer; the variable amplitude rod 204 cooperates with the piezoelectric ceramic 203 and is mainly used to change the amplitude of the piezoelectric ceramic, improve the vibration speed ratio, improve the efficiency, and improve the mechanical quality factor. In addition, the variable amplitude rod 202 and the mass block 204 are hollow at the center and are provided with a hollow channel for the rotating shaft 303 to pass through, and a copper sleeve 305 is arranged in the hollow channel of the variable amplitude rod 202 and the mass block to serve as a bearing; the front end of the variable amplitude rod 202 is provided with the locking rod 201.

[0046] As Figure 6 shown, the rotating motor assembly 300 includes a rotating motor 301, a shaft coupling 302, a rotating shaft 303, a torque input shaft 304, and a copper sleeve 305. One end of the shaft coupling 302 is connected with the rotating motor 301, and the other end is connected with the rotating shaft 303. The rotating shaft 303 is divided into two stages, one of which is installed inside the ultrasonic transducer assembly 200, and the other of which is installed inside the handpiece assembly 100. The two stages of the rotating shaft 303 are meshed with each other through the rotating gears at the end points of each stage to transmit rotation, and each stage of the rotating shaft 303 is provided with a copper sleeve 305 to replace the bearing to ensure the normal work of the rotating shaft 303. When the rotating motor 301 works, it drives the rotating shaft 303 at each stage to move synchronously, and finally the torque input shaft 304 drives the central gear 106 in the handpiece assembly 100 to move synchronously, at this time the root canal file 110 in the handpiece assembly 100 also rotates synchronously with the central gear 106. The inside of the locking rod 201 is left with a gear space for the installation of the rotating gear.

[0047] As Figure 7As shown, after assembling each component, a voltage is applied to both ends of the piezoelectric ceramic 203 in the ultrasonic transducer assembly 200, and the piezoelectric ceramic 203 generates deformation and ultrasonic vibration based on the piezoelectric inverse effect. Since the locking connector 109 in the handpiece assembly 100 and the locking rod 201 in the ultrasonic transducer assembly 200 connect the handpiece shell 101 with the ultrasonic amplitude rod 202 and the ultrasonic wave output end, the driving force of the piezoelectric ceramic 203 can be transmitted to the handpiece shell 101 through the locking rod 201 at the front end, so that the handpiece shell 101 synchronously vibrates ultrasonically. Since the handpiece assembly 100 has a certain bending angle (similar to the bending angle of a conventional handpiece, which meets the conventional use scenario), the handpiece shell assembly 100 can generate approximate axial ultrasonic vibration. At the same time, the internal components of the handpiece shell 101 are integrally packaged with the handpiece shell 101, and the internal components and the handpiece shell 101 synchronously vibrate ultrasonically, and finally are transmitted to the upper end of the root canal file 110, so that the root canal file 110 can also generate axial ultrasonic vibration. In addition, under the condition of ultrasonic vibration of the root canal file 110, the rotating motor 301 outputs rotation, which is transmitted to the torque input shaft 304 through the rotating shafts 303 and the meshing gears at each level, and the torque input shaft 304 drives the central gear 106 in the handpiece assembly to synchronously move, and the root canal file 110 in the handpiece assembly also rotates with the central gear 106. At this time, the root canal file 110 realizes the dual driving mode of axial ultrasonic vibration and rotation.

[0048] The core point of the embodiment of the present application is the ultrasonic vibration and mechanical rotation dual driving mode. The rotating assembly is packaged in the interior of the handpiece shell, the handpiece shell is connected with the output end of the ultrasonic transducer, the handpiece shell is vibrated as the output load of the transducer, the rotating assembly packaged in the handpiece shell is driven to synchronously vibrate ultrasonically, in addition, a rotating shaft is arranged in the ultrasonic transducer, and the rotating assembly in the handpiece interior is driven to rotate through the input of the rotating motor, so as to realize the dual driving mode of ultrasonic vibration and rotation of the root canal file, and the ultrasonic vibration and rotation can also be independently realized.

[0049] The embodiment of the present application adopts the ultrasonic vibration and rotation dual driving mode to add high-frequency reciprocating motion at the interface between the instrument and the root canal, avoids continuous static extrusion of the root canal file and the root canal, makes the root canal file and the root canal continuously "out of contact", greatly reduces the average friction coefficient, and thus reduces the driving torque and energy consumption required by the rotating motion. Moreover, compared with the original single rotation mode, the ultrasonic vibration and rotation dual driving mode reduces the friction, so that a greater effective cutting force and feed force can be applied in the use process. At the same time, the high-frequency impact brought by the ultrasonic vibration is helpful for breaking the chips and softening the material.

[0050] Secondly, the ultrasonic vibration and rotation dual driving mode effectively reduces the deformation of the workpiece and the lower cutting temperature, avoids the heat in the root canal preparation process from causing discomfort to the patient, and in addition, the ultrasonic vibration is helpful for obtaining a root canal inner wall with high surface quality and avoiding the generation of a contamination layer.

[0051] The core of the ultrasonic vibration rotary compound motion is to synchronously solve the dual needs of anatomical shaping and biological decontamination: on the one hand, the natural root canal trend is maintained by avoiding root canal deviation caused by rigid instruments through high-frequency micro-amplitude oscillation; on the other hand, the depth of biological membrane infection is removed through the trinity of acoustic streaming-cavitation-thermal effect, the tightness of root canal filling is improved, the retention time of the diseased tooth is prolonged, and it is especially suitable for old patients and complex anatomical cases.

[0052] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. An ultrasonic vibration and rotation dual-drive mode root canal treatment device, characterized by: It includes a head assembly, an ultrasonic transducer assembly and a rotating motor assembly which are connected in sequence; The handpiece assembly includes a handpiece housing, wherein a central gear, an upper core shaft, and a lower core shaft are arranged in the handpiece housing; the central gear is clamped and fixed between the upper core shaft and the lower core shaft, and the lower core shaft fixes the root canal file through a root canal file fixing member; The ultrasonic transducer assembly includes a piezoelectric ceramic, a horn, a locking rod and a rear mass block. The piezoelectric ceramic is clamped between the horn and the rear mass block. The horn is provided with a hollow channel. The front end of the horn is connected to the locking rod. The locking rod is connected to the head assembly through a locking connector. The rotary motor assembly includes a rotary motor, a coupling, and a rotary shaft connected in sequence; the rotary shaft passes through the hollow channel and extends into the head assembly, and the end thereof is engaged with the central gear through the torque input shaft; The ultrasonic transducer assembly transmits axial ultrasonic vibration to the handpiece assembly; the rotary motor assembly drives the central gear to drive the root canal file to rotate; and the ultrasonic vibration mode, the rotation mode and the dual drive mode can work independently or in coordination.

2. The root canal treatment device with ultrasonic vibration and rotation dual drive mode according to claim 1, characterized in that: The machine head assembly includes an upper bearing and a lower bearing, and one side of the upper core shaft and the lower core shaft is respectively provided with a bearing mounting seat, and the upper bearing and the lower bearing are respectively installed on the bearing mounting seats of the upper core shaft and the lower core shaft; one end of the upper bearing and the lower bearing is respectively provided with an upper pressure ring and a lower pressure ring, and the upper pressure ring and the lower pressure ring are fixedly connected to the machine head shell.

3. The root canal treatment device with ultrasonic vibration and rotation dual drive mode according to claim 2, characterized in that: The root canal file fixing component includes a locking cap. The center of the lower end core shaft is provided with a hole for installing the root canal file. The lower end of the lower end core shaft is connected to the locking cap through threaded cooperation to fix the root canal file.

4. The root canal treatment device with ultrasonic vibration and rotation dual drive mode according to claim 1, characterized in that: The locking connector is located at the tail of the head shell, and the locking connector is connected to the locking rod through threads.

5. The root canal treatment device with ultrasonic vibration and rotation dual drive mode according to claim 1, characterized in that: The torque input shaft is located outside the handpiece housing, and the outer periphery of the torque input shaft is covered by the handpiece housing.

6. The root canal treatment device with ultrasonic vibration and rotation dual drive mode according to claim 1, characterized in that: The rotating shaft includes two stages, one stage is installed inside the ultrasonic transducer assembly, and the other stage is installed inside the head assembly. The two stages of the rotating shaft are engaged with each other to transmit torque through the rotating gears at the ends of each stage, and each stage of the rotating shaft is provided with a copper sleeve support.

7. The root canal treatment device with ultrasonic vibration and rotation dual drive mode according to claim 6, characterized in that: A gear space is reserved inside the locking rod for accommodating the rotating gear.

8. The root canal treatment device with ultrasonic vibration and rotation dual drive mode according to claim 6, characterized in that: The piezoelectric ceramic comprises two groups of symmetrically arranged piezoelectric ceramic sheets, which generate axial ultrasonic vibrations through the inverse piezoelectric effect.

9. The root canal treatment device with ultrasonic vibration and rotation dual drive mode according to claim 1, characterized in that: The handpiece shell has a preset bending angle so that when the ultrasonic vibration is transmitted to the root canal file, an approximately axial impact motion is generated.

10. The method for operating the root canal treatment device in the ultrasonic vibration and rotation dual drive mode according to any one of claims 1 to 9, wherein: The root canal treatment device with ultrasonic vibration and rotation dual drive mode includes the following modes: a) Ultrasonic vibration mode: only the ultrasonic transducer assembly is activated to make the root canal file produce axial impact motion; b) Rotation mode: only the rotation motor assembly is started to make the root canal file rotate continuously; c) Dual drive mode: The ultrasonic transducer assembly and the rotary motor assembly are started synchronously, so that the root canal file performs axial ultrasonic vibration and rotational motion at the same time.

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