Tooth cleaning device

Abstract

The utility model discloses a tooth cleaning device, which relates to the technical field of medical instruments, provides hardware support for solving the problem of poor stability during continuous working in the prior art, and has the technical key points that the output current of a power amplification module is monitored in real time, and resonant frequency is searched in time according to the magnitude of the current; monitoring a voltage signal of an input port of the piezoelectric ceramic transducer and a current signal of an output port of the piezoelectric ceramic transducer in real time, confirming a new PWM frequency control signal according to a phase difference between the two signals, and tracking a new resonant frequency; the controller module sends a power regulation control signal to the voltage regulation module according to the change of the current signal so as to change the vibration intensity of the working head; the working head comprises the arc-shaped part 2, the direction of the working part 4 can be changed, and teeth can be cleaned as usual for a contact surface with a limited space and a bent structure. According to the utility model, frequency search, frequency tracking, power regulation and a working head are improved and optimized from hardware and structure, and the stability in a continuous working state is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, and particularly relates to a dental cleaning device. BACKGROUND

[0002] The dental cleaning device is a medical apparatus and instrument for preventing and treating periodontal disease. It contacts the tooth surface (including the biting surface, the contact surface of the tooth and the gum, and the contact surface between adjacent teeth) by using the working head of ultrasonic vibration, and removes the dental plaque, dental plaque and dental calculus on the surface by physical method. The existing dental cleaning device only samples the voltage or current for frequency tracking, so that the new resonant frequency is confirmed slowly and inaccurately when the resonant frequency drifts, and different people have different degrees of firmness, shapes and hardness of the surface attachments of the teeth, so different angles of the working head and different vibration intensities are needed to achieve dental cleaning.

[0003] A good dental cleaning device should be able to quickly search for the resonant frequency, quickly track the resonant frequency when the resonant frequency drifts, automatically adjust the vibration intensity according to the hardness of the surface attachments of the teeth, and fully clean the curved teeth with sufficient stable working state to achieve dental cleaning while avoiding damage to the teeth and gums. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a dental cleaning device, which provides hardware support for solving the problem of poor stability during continuous work in the prior art.

[0005] The technical scheme of the utility model is as follows:

[0006] A dental cleaning device comprises a controller module, an oscillation circuit module, a power amplifier module, a voltage regulating module, an impedance matching module, a piezoelectric ceramic transducer, a working head, a current detection module, a voltage detection module and a phase detection module.

[0007] The controller module sends a PWM frequency control signal to the oscillation circuit module; the signal output end of the oscillation circuit module is connected to the power amplifier module; the controller module sends a power control signal to the voltage regulating module, and the output end of the voltage regulating module is connected to the voltage input end of the power amplifier module; the output end of the power amplifier module is connected to the piezoelectric ceramic transducer through the impedance matching module, and the feedback end of the power amplifier module is connected to the controller module; the piezoelectric ceramic transducer outputs an electric signal to control the working intensity of the working head; the voltage detection module detects the voltage signal of the input port of the piezoelectric ceramic transducer; the current detection module detects the current signal of the output port of the piezoelectric ceramic transducer; the voltage signal and the current signal are input to the phase detection module; the phase detection module outputs a phase difference signal to the controller module.

[0008] The working head comprises a connecting part, an arc-shaped part, a movable part and a working part; the connecting part is connected with an external handle; one end of the arc-shaped part is fixedly connected to the connecting part, and the other end of the arc-shaped part is movably connected to the movable part; the working part is fixedly installed on the movable part and rotates with the movable part.

[0009] Further, the surface of the working part is provided with helical teeth.

[0010] Further, the movable part is detachably connected with the arc-shaped part; and the movable part is detachably connected with the working part.

[0011] Further, the power amplification module comprises a half-bridge driving circuit and an inverter power amplification circuit; the output signal of the oscillation circuit module is output as an oscillation signal of 160V-380V through the half-bridge driving circuit and the inverter power amplification circuit.

[0012] Further, the step frequency of the PWM frequency control signal is 80Hz.

[0013] Further, the impedance matching module is an inductance series tuning matching circuit.

[0014] Further, the working part is made of TC4 titanium alloy material.

[0015] Due to the adoption of the above technical scheme, the utility model has the beneficial effects that:

[0016] The output current of the power amplification module is monitored in real time, the loop current is maximum when resonating, and the resonant frequency can be searched in time according to the current size; the voltage signal of the input port and the current signal of the output port of the piezoelectric ceramic transducer are monitored in real time, the new PWM frequency control signal is confirmed according to the phase difference between the voltage signal and the current signal, and the new resonant frequency is tracked; the controller module sends the power adjustment control signal to the voltage regulating module according to the change of the current signal, so as to change the power supply voltage of the power amplification module, and further change the output voltage of the piezoelectric ceramic transducer, so as to change the vibration intensity of the working head; the designed working head contains the arc-shaped part, and the working part can change the direction to work, and the curved contact surface can also be cleaned normally in the case of limited space. The utility model improves and optimizes the frequency search, frequency tracking, power adjustment and working head from the hardware and structure, and improves the stability of the cleaning device in the continuous working state. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The utility model is a structural principle block diagram.

[0018] Figure 2 The structure diagram of the working head.

[0019] The reference signs in the figure are: 1, connecting part; 2, arc-shaped part; 3, movable part; 4, working part. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0021] Figure 1 The utility model structural principle block diagram. A kind of dental device, including controller module, oscillation circuit module, power amplifier module, voltage regulating module, impedance matching module, piezoelectric ceramic transducer, working head, current detection module, voltage detection module and phase detection module;The controller module sends PWM frequency control signal to the oscillation circuit module;The signal output end of the oscillation circuit module is connected to the power amplifier module;The controller module sends power control signal to the voltage regulating module, and the output end of the voltage regulating module is connected to the voltage input end of the power amplifier module;The output end of the power amplifier module is connected to the piezoelectric ceramic transducer via the impedance matching module, and the feedback end of the power amplifier module is connected to the controller module;The working intensity of the working head is controlled by the piezoelectric ceramic transducer output electric signal;The voltage detection module detects the voltage signal of piezoelectric ceramic transducer input port;The current detection module detects the current signal of piezoelectric ceramic transducer output port;The voltage signal, current signal are input to the phase detection module;The phase detection module outputs phase difference signal to the controller module;The working head includes connecting part 1, arc-shaped part 2, movable part 3 and working part 4;The connecting part 1 is connected with external handle;One end of the arc-shaped part 2 is fixedly connected to the connecting part 1, and the other end of the arc-shaped part 2 is movably connected to the movable part 3;The working part 4 is fixedly installed on the movable part 3 and rotates with the movable part 3.

[0022] Oscillation circuit module is the circuit of adjustable pulse width, changes output frequency by adjusting the comparison voltage of internal oscillator.Oscillation circuit module after receiving the PWM frequency control signal of controller module, it is filtered, smooth, locked, adjusted, triggered and so on after processing, output high precision, frequency adjustable oscillation pulse signal.Usually, the smaller the PWM frequency control signal, the higher the frequency search precision, but the time complexity also increases, through test verification finds that, when step frequency is set to be less than or equal to 80Hz, it can accurately search to the resonant frequency while also improving the frequency search speed.

[0023] The power amplification module comprises a half-bridge driving circuit and an inverter power amplification circuit; the output signal of the oscillation circuit module is output as an oscillation signal of 160V-380V through the half-bridge driving circuit and the inverter power amplification circuit. The half-bridge driving circuit comprises two mutually independent output control circuits, directly drives the MOSFET power tube of the inverter power amplification circuit, and the oscillation pulse signal output by the oscillation circuit module controls the turn-by-turn conduction of the MOSFET power tube of the inverter power amplification circuit, and finally the inverter power amplification circuit outputs an oscillation signal with a peak value of 160V-380V. When the piezoelectric ceramic transducer works in a resonant state, the current in the circuit loop is maximum, therefore, the frequency point corresponding to the maximum feedback current is the resonant frequency, and the feedback end of the power amplification module is connected to the controller module, so that the controller module can monitor the feedback current in real time and search and track the resonant frequency according to the loop current.

[0024] The impedance matching module is an inductive series tuning matching circuit, that is, an inductor is connected in series across the piezoelectric ceramic transducer, and the capacitive load of the piezoelectric ceramic transducer is offset by using a series equivalent inductive load. The inductive series tuning matching circuit has an impedance conversion effect, can reduce the active impedance and thus improve the active power, and also has a filtering effect. Only in the case of impedance matching, the piezoelectric ceramic transducer can start to work.

[0025] During continuous work, the increase of heat generation during the high-power period of the dental cleaning device and the change of load (hardness of dental plaque, dental plaque and dental calculus) can cause the resonant frequency to drift, causing the piezoelectric ceramic transducer to be out of tune, affecting the stability of the piezoelectric ceramic transducer, and even stopping vibration. Therefore, it is necessary to track the resonant frequency in real time and accurately. The voltage detection module is arranged to detect the voltage signal at the input end of the piezoelectric ceramic transducer, and the current detection module is arranged to detect the current signal at the output end of the piezoelectric ceramic transducer. When the resonant frequency is out of tune, the phase difference between the voltage signal and the current signal is non-zero, and the phase detector detects the non-zero phase, which is fed back to the controller module, and the controller module sends a new PWM frequency control signal to the oscillation circuit module. The new resonant frequency is locked by combining the feedback current size of the power amplification module and whether the non-zero phase is zero, so that the entire device is always in the best working state.

[0026] During the tooth cleaning process, the vibration intensity of the piezoelectric ceramic transducer is adjusted according to the hardness of the load, so as to adjust the vibration intensity of the working head, and the input voltage of the half-bridge driving circuit is changed to change the output voltage of the inverter power amplification circuit, so as to control the output voltage of the piezoelectric ceramic transducer, and further change the vibration intensity of the working head. Therefore, the utility model discloses a voltage regulating module controlled by the controller module, the voltage regulating module includes a digital potentiometer and a voltage stabilizer, the digital potentiometer receives the power control signal from the controller module, changes the resistance value according to the power control signal, and further changes the input voltage of the voltage stabilizer, and the voltage stabilizer outputs the voltage signal corresponding to the power control signal, so as to change the power supply voltage of the power amplification module, and further change the voltage loaded on the piezoelectric ceramic transducer.

[0027] The working head works under the drive of the piezoelectric ceramic transducer, and is limited by the tooth structure itself and the narrow space structure between the tooth and the lip, tongue and cheek. The working head with the linear type and fixed working part 4 cannot realize comprehensive tooth cleaning, especially the contact surfaces between the wisdom tooth and the molar tooth, between the molar tooth and the molar tooth, and between the molar tooth and the cheek. It is more difficult to clean teeth when the tooth structure is complex, so it is necessary to improve the working head. The utility model sets up the arc part 2 on the working head, and the cheek surface is expanded in the space limited area, so as to provide enough space for the working part 4 to expand the tooth cleaning work. The working part 4 can rotate with the movable part 3, so that the working part 4 can adjust the direction to complete the tooth cleaning even if the tooth structure is curved and the contact surface is deformed. Further, the surface of the working part 4 is provided with helical teeth, which can increase the efficiency of the working head cleaning teeth. The movable part 3 and the arc part 2 are detachably connected, and the movable part 3 and the working part 4 are detachably connected, which can facilitate cleaning and disinfection. The working part 4 is made of TC4 titanium alloy material, which has low hardness, small amplitude and good elasticity, and can greatly reduce the discomfort of the patient during treatment. The structure diagram of the working head is shown in Figure 2 .

[0028] The working process of the utility model is: the controller module sends the PWM frequency control signal to the oscillation circuit module, and the oscillation circuit module generates the corresponding oscillation signal according to the PWM frequency control signal; the power amplification circuit generates the corresponding voltage signal according to the power supply voltage provided by the voltage regulating module, and the voltage signal is used to power the piezoelectric ceramic transducer after impedance matching, and the piezoelectric ceramic transducer generates vibration of corresponding intensity according to the voltage signal, and drives the working head to expand the tooth cleaning work; the real-time monitoring feedback current of the power amplification module determines the resonance frequency according to the maximum feedback current; the voltage at the input end of the piezoelectric ceramic transducer and the phase difference between the output current of the piezoelectric ceramic transducer are monitored in real time, and the new resonance frequency is tracked in real time according to the change of the phase difference; when the load of the working head changes, the feedback current will also change accordingly, and the controller module adjusts the power control signal according to the change of the feedback current, so as to change the working voltage of the power amplification module provided by the voltage regulating module, and further change the vibration intensity of the working head.

[0029] The above description is a detailed description of the preferred and feasible embodiments of the present application, but the embodiments are not intended to limit the scope of the patent application of the present application, and any equivalent changes or modifications made under the technical spirit of the present application should belong to the patent scope covered by the present application.

[0030] Most of the technical solutions of the system type in the electronic field need the cooperation of hardware and computer programs to solve technical problems, but if the computer program only involves simple operations, comparisons and controls, the technical solution should not be considered to involve the improvement of the computer program, and the technical solution should belong to the protection object of the utility model. The present application provides hardware support to solve the problem of poor stability during continuous operation in the prior art, and the description, claims and technical effects introduce the contribution made in the hardware structure to solve the technical problem, and the receiving and control involved in the controller module in the description belong to simple operations, comparisons and controls, and do not involve the improvement of the computer program, therefore the technical solution belongs to the protection object of the utility model.

Claims

1. A tooth cleaning device characterized in that: it comprises a controller module, an oscillation circuit module, a power amplifier module, a voltage regulation module, an impedance matching module, a piezoelectric ceramic transducer, a working head, a current detection module, a voltage detection module and a phase detection module; the controller module sends a PWM frequency control signal to the oscillation circuit module; the signal output end of the oscillation circuit module is connected to the power amplifier module; the controller module sends a power control signal to the voltage regulation module, and the output end of the voltage regulation module is connected to the voltage input end of the power amplifier module; the output end of the power amplifier module is connected to the piezoelectric ceramic transducer through the impedance matching module, and the feedback end of the power amplifier module is connected to the controller module; the piezoelectric ceramic transducer outputs an electric signal to control the working strength of the working head; the voltage detection module detects the voltage signal of the input port of the piezoelectric ceramic transducer; the current detection module detects the current signal of the output port of the piezoelectric ceramic transducer; the voltage signal and the current signal are input to the phase detection module; the phase detection module outputs a phase difference signal to the controller module; the working head comprises a connecting part (1), an arc-shaped part (2), a movable part (3) and a working part (4); the connecting part (1) is connected with an external handle; one end of the arc-shaped part (2) is fixedly connected to the connecting part (1), and the other end of the arc-shaped part (2) is movably connected to the movable part (3); the working part (4) is fixedly installed on the movable part (3) and rotates with the movable part (3).

2. A dental device according to claim 1 wherein: The surface of the working part (4) is provided with helical teeth.

3. The tooth cleaning device according to claim 1 characterized in that: the movable part (3) is detachably connected with the arc-shaped part (2); and the movable part (3) is detachably connected with the working part (4).

4. The tooth cleaning device according to claim 1 characterized in that: the power amplifier module comprises a half-bridge drive circuit and an inverter power amplifier circuit; the output signal of the oscillation circuit module is output as an oscillation signal of 160V-380V through the half-bridge drive circuit and the inverter power amplifier circuit.

5. A dental device according to claim 1 wherein: The step frequency of the PWM frequency control signal is 80Hz.

6. A dental device according to claim 1 wherein: The impedance matching module is an inductance series tuning matching circuit.

7. A dental device according to claim 1 wherein: The working part (4) is made of TC4 titanium alloy material.

Images