An implant stability testing device and method

Abstract

The present invention discloses a dental implant stability test device and method. The dental implant stability test device comprises: a test handheld device and a unit to be tested; the test handheld device comprises: a shell and a battery located in the shell, a signal sending and detection unit, a control unit and a human-computer interaction unit; the unit to be tested comprises a metal base and an amorphous alloy strip; the amorphous alloy strip is attached to the outer surface of the metal base; the battery is electrically connected to the human-computer interaction unit; the signal sending and detection unit comprises a magnetic rod and a detection coil; the detection coil is wound on the magnetic rod; the first end and the second end of the detection coil are both electrically connected to the control unit; the human-computer interaction unit is electrically connected to the control unit. The present invention can improve the convenience of operation of the dental implant stability test device, improve the test efficiency, and improve the accuracy of the test results.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of medical equipment, and in particular to a dental implant stability testing device and method.

[0002] This application also claims priority and benefits of Patent Application No. 202010510203.0, filed on June 4, 2020, for a handheld implant stability testing method and intelligent testing device, which is incorporated herein by reference in its entirety. Background Art

[0003] Dental implants have been used in clinical practice for decades to restore tooth loss. Compared with traditional denture restoration methods, oral implant restoration has unique advantages in function and aesthetics, so its clinical application is becoming more and more extensive. However, at present, whether oral implant implantation is successful and when to proceed to the next surgical operation have become issues that must be addressed in dental implants. It is currently believed that initial stability is the key factor in determining the success or failure of implant implantation. The initial stability of implants is closely related to the following three factors: implant surgery skills, implant-related factors, and the quality and quantity of jawbone. In actual clinical operations, whether implantation is successful depends to a large extent on the ability of clinicians to judge and measure the initial stability of implants and the ability to continuously monitor the changes in the stability of loaded implants. Based on the subjective judgment of doctors, the lack of systematic and objective research indicators and reference standards often leads to difficulties in clinical judgment, resulting in problems such as improper selection of restoration timing and implant shedding, so it is necessary to conduct in-depth research on it. How to conduct regular non-contact sterile measurements after implants are placed in the oral cavity to obtain accurate implant stability has become a new hot spot in the field of oral implant research in recent years.

[0004] At present, the commonly used implant stability evaluation methods include: clinical outpatient clinic, implantation torque method, rotation torque method and Periotest method. However, clinical outpatient clinic is a subjective measurement method, which cannot be quantified, and the comparability between different measurement values ​​is poor. The implantation torque and rotation torque methods are quantitative measurements, but the former can only be measured when the implant is implanted and cannot continuously monitor the stability of the implant. The latter cannot be used in clinical research due to ethical taboos. The Periotest method is a quantitative measurement method, but many factors can interfere with the accuracy of the Periotest measurement value, and its measurement repeatability is questioned. Therefore, the existing dental implant stability test methods have the problems of low test efficiency and inaccurate results. Summary of the invention

[0005] The embodiment of the present invention provides a dental implant stability testing device and method to solve the problems of low testing efficiency and inaccurate results of dental implant stability testing equipment in the prior art.

[0006] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0007] A dental implant stability testing device, comprising: a testing handheld device and a unit under test; the testing handheld device comprises: a battery, a signal sending and detecting unit, a control unit and a human-computer interaction unit;

[0008] The unit under test comprises a metal base and an amorphous alloy strip; the amorphous alloy strip is adhered to the outer surface of the metal base; the unit under test is used to be fixed on the dental implant when the stability of the dental implant needs to be tested, and transmits an induction signal to the signal sending and detecting unit through electromagnetic induction;

[0009] The positive electrode of the battery is electrically connected to the first input terminal of the human-machine interaction unit, and the negative electrode of the battery is electrically connected to the second input terminal of the human-machine interaction unit;

[0010] The signal sending and detecting unit comprises a magnetic rod and a detecting coil; the detecting coil is wound on the magnetic rod; the first end of the detecting coil is the input end of the signal sending and detecting unit, and is electrically connected to the first output end of the control unit; the second end of the detecting coil is the output end of the signal sending and detecting unit, and is electrically connected to the second input end of the control unit; the signal sending and detecting unit is used to excite the vibration of the amorphous alloy strip, and generate a detection signal according to the induction signal;

[0011] The control unit is used to control the working state of the signal sending and detection unit, and obtain the test result according to the detection signal;

[0012] The output end of the human-machine interaction unit is electrically connected to the first input end of the control unit; the third input end of the human-machine interaction unit is electrically connected to the second output end of the control unit; the human-machine interaction unit is used to be turned on when the stability of the dental implant needs to be tested, and to display the test results.

[0013] A method for testing the stability of a dental implant, comprising the following steps:

[0014] installing the unit under test on the dental implant;

[0015] Close the switch in the human-machine interaction unit to power the test handset through the battery;

[0016] Moving the test handset to a position less than a first distance from the unit under test;

[0017] The control unit applies a detection coil driving signal to the detection coil, wherein the detection coil driving signal generates a changing magnetic field in the space surrounding the detection coil; wherein the detection coil driving signal is a variable frequency and variable amplitude voltage signal;

[0018] The changing magnetic field excites the amorphous alloy strip of the measured unit to vibrate and form an induction signal;

[0019] The detection coil senses the induction signal, generates a detection signal according to the induction signal and transmits it to the control unit;

[0020] The control unit generates a test result according to the detection signal and transmits the result to the touch screen of the human-computer interaction unit;

[0021] The touch screen displays the test result.

[0022] The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

[0023] In the embodiment of the present invention, a signal sending and detection unit and a unit under test are provided, and the two transmit signals through electromagnetic induction. Among them, the unit under test includes a metal base and an amorphous alloy strip, and the amorphous alloy strip is attached to the outer surface of the metal base; the signal sending and detection unit includes a magnetic rod and a detection coil, and the detection coil is wound on the magnetic rod. When the stability of the dental implant needs to be tested, the unit under test is fixed on the dental implant, and the signal sending and detection unit excites the vibration of the amorphous alloy strip according to the detection coil driving signal of the control unit. After the detection coil senses the vibration of the amorphous alloy strip, the impedance value will change. The control unit analyzes the change of the impedance value of the detection coil to obtain the test result, and the final test result is displayed by the human-computer interaction unit. In the embodiment of the present invention, the resonant frequency of the dental implant is actually measured by the change of the impedance value of the detection coil, and the stability of the dental implant is finally calculated by the magnitude of the resonant frequency. Therefore, the technical solution of the present application is highly operable, is not affected by the subjective factors of medical personnel, can measure the stability at any time, and is convenient to operate. The technical solution of the embodiment of the present invention only takes a few seconds to test the stability, greatly shortens the test time, and improves the work efficiency of medical personnel. The battery-powered mode does not require additional wires, thus ensuring sterility during the test. Therefore, the embodiment of the present invention can improve the convenience of operation of the dental implant stability test device, improve the test efficiency, and improve the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a structural schematic diagram of a dental implant stability testing device provided by an embodiment of the present invention;

[0027] Figure 2 is a structural schematic diagram of another dental implant stability testing device provided by an embodiment of the present invention;

[0028] Figure 3 is a circuit diagram of a signal driving circuit provided by an embodiment of the present invention;

[0029] Figure 4 is a circuit diagram of another signal driving circuit provided by an embodiment of the present invention;

[0030] Figure 5 is a circuit diagram of a signal processing circuit provided by an embodiment of the present invention;

[0031] Figure 6 is a circuit diagram of another signal processing circuit provided by an embodiment of the present invention;

[0032] Figure 7 It is a flow chart of a method for testing the stability of a dental implant provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0034] In order to better understand the present application, the implementation methods of the present application are explained in detail below with reference to the accompanying drawings.

[0035] The embodiment of the present invention provides a dental implant stability testing device. Figure 1 , Figure 1 Schematic diagram of the structure of a dental implant stability testing device provided by an embodiment of the present invention. Figure 1It can be seen that the dental implant stability test device provided in the embodiment of the present invention mainly includes: a test handheld device 10 and a unit under test 20; the test handheld device 10 includes: a battery 11, a signal sending and detection unit 14, a control unit 13 and a human-computer interaction unit 12;

[0036] The measured unit 20 includes a metal base 22 and an amorphous alloy strip 21; the amorphous alloy strip 21 is adhered to the outer surface of the metal base 22. Compared with the complex horn in the prior art, the sensor made of the amorphous alloy strip 21 with a simpler structure is used in the present device to measure the resonance frequency of the dental implant.

[0037] The unit under test 20 is used to be fixed on the dental implant when the stability of the dental implant needs to be tested, and transmits the induction signal to the signal sending and detecting unit 14 through electromagnetic induction. The device excites the sensor made of amorphous alloy strip 21 through wireless electromagnetic signals, applies excitation to the dental implant, and measures the vibration mode generated to complete the stability measurement. The use of non-contact measurement can make the operation simpler and more convenient.

[0038] The positive electrode of the battery 11 is electrically connected to the first input terminal of the human-machine interaction unit 12, and the negative electrode of the battery 11 is electrically connected to the second input terminal of the human-machine interaction unit 12; the battery 11 is used to power the entire device. Optionally, the battery 11 can be a button battery or a rechargeable battery, etc., and the battery type can be selected as needed.

[0039] The signal sending and detecting unit 14 includes a magnetic rod 142 and a detection coil 141; the detection coil 141 is wound around the magnetic rod 142; the first end of the detection coil 141 is the input end of the signal sending and detecting unit 14, and is electrically connected to the first output end of the control unit 13; the second end of the detection coil 141 is the output end of the signal sending and detecting unit 14, and is electrically connected to the second input end of the control unit 13; the signal sending and detecting unit 14 is used to excite the vibration of the amorphous alloy strip 21, and generate a detection signal according to the induction signal.

[0040] The control unit 13 is used to control the working state of the signal sending and detection unit 14 and obtain the test result according to the detection signal.

[0041] The control unit 13 applies the detection coil driving signal with changing frequency and amplitude to the detection coil 141 to control the working state of the signal sending and detection unit 14. The amorphous alloy strip 21 on the dental implant senses the changing driving signal and vibrates, thereby generating an induction signal. The detection coil 141 is affected by the vibration of the amorphous alloy strip 21, senses the induction signal, and the impedance value of the detection coil 141 changes to generate a detection signal. The control unit 13 then measures the resonance frequency through the detection signal reflecting the change in the impedance value of the detection coil 141, and obtains the test result of the stability of the dental implant.

[0042] The output end of the human-machine interaction unit 12 is electrically connected to the first input end of the control unit 13; the third input end of the human-machine interaction unit 12 is electrically connected to the second output end of the control unit 13; the human-machine interaction unit 12 is used to be turned on when the stability of the dental implant needs to be tested, so that the battery 11 can power the entire device and the device works normally. When there is no need to detect the stability of the dental implant, the human-machine interaction unit 12 disconnects the circuit connection, and the entire device is powered off and does not work. The human-machine interaction unit 12 can also display the test results. For example, the human-machine interaction unit may include a display screen, and the test results can be displayed on the display screen in the form of text or images.

[0043] In the embodiment of the present invention, the dental implant stability test device adopts a handheld integrated design, and a signal sending and detecting unit 14 is provided in the test handheld device 10. Signals are transmitted between the signal sending and detecting unit 14 and the unit under test 20 by electromagnetic induction. The unit under test 20 includes a metal base 22 and an amorphous alloy strip 21, and the amorphous alloy strip 21 is attached to the outer surface of the metal base 22; the signal sending and detecting unit 14 includes a magnetic rod 142 and a detection coil 141, and the detection coil 141 is wound on the magnetic rod 142. When the stability of the dental implant needs to be tested, the unit under test 20 is fixed on the dental implant, and the signal sending and detecting unit 14 excites the vibration of the amorphous alloy strip 21 according to the detection coil driving signal of the control unit 13. After the detection coil 141 senses the vibration of the amorphous alloy strip 21, the impedance value will change. The control unit 13 analyzes the change in the impedance value of the detection coil 141 to obtain the test result, and the final test result is displayed by the human-computer interaction unit 12. The embodiment of the present invention actually measures the resonance frequency of the dental implant by the change of the impedance value of the detection coil 141, and finally calculates the stability of the dental implant by the magnitude of the resonance frequency. Therefore, the technical solution of the present application is highly operational, not affected by the subjective factors of medical personnel, and can measure the stability at any time and is easy to operate. The technical solution of the embodiment of the present invention only takes a few seconds to test the stability, which greatly shortens the test time and improves the work efficiency of medical personnel. By using the battery 11 for power supply, there is no need to add additional wires, which ensures the sterility during the test. Therefore, the embodiment of the present invention can improve the ease of operation of the dental implant stability testing device, improve the test efficiency, and improve the accuracy of the test results.

[0044] Further, see Figure 2 , Figure 2 Schematic diagram of another structure of a dental implant stability test device provided by an embodiment of the present invention. Figure 2 As shown, the test handset includes a housing 15 , in which a battery 11 , a signal sending and detecting unit 14 , a control unit 13 and a human-machine interaction unit 12 are all arranged.

[0045] Exemplarily, the signal sending and detecting unit 14 is placed at the front end of the product housing 15, the control unit 13 is placed at the middle of the product housing 15, and the human-machine interaction unit 12 is placed at the rear of the product housing 15. The signal sending and detecting unit 13 is connected to the control unit 13 via a wire, and the human-machine interaction unit 14 is connected to the control unit 13 via a wire.

[0046] Furthermore, the human-computer interaction unit 12 includes: a switch 121 , a voltage conversion circuit 122 and a touch screen 123 .

[0047] The switch 121 is connected to the voltage conversion circuit 122. The switch 121 may be a mechanical switch, and its control point may extend out of the housing 15 to facilitate the use of operators. The switch 121 may be controlled manually or by the control unit 13.

[0048] The first input end of the voltage conversion circuit 122 is the first input end of the human-machine interaction unit 12, the second input end of the voltage conversion circuit 122 is the second input end of the human-machine interaction unit 12; the output end of the voltage conversion circuit 122 is the output end of the human-machine interaction unit 12. The voltage conversion circuit 122 is used to convert the power supply voltage output by the battery 11 into the working voltage required by the control unit 13. The input end of the touch screen 123 is the third input end of the human-machine interaction unit 12. The touch screen 123 is used to display the test results.

[0049] Furthermore, the control unit 13 includes: a main control module 131 , a signal driving circuit 132 and a signal processing circuit 133 .

[0050] The first input end of the main control module 131 is the first input end of the control unit 13; the first output end of the main control module 131 is electrically connected to the input end of the signal driving circuit 132. The main control unit may be an MCU, a DSP or other single chip microcomputer.

[0051] The output end of the signal driving circuit 132 is the first output end of the control unit 13. The signal driving circuit is used to apply the detection coil driving signal to the detection coil 141. Exemplarily, the signal driving circuit 132 can be composed of a dedicated chip, or can be designed by a combination of MOSFET, IGBT, triode, etc. Preferably, the signal driving circuit 132 is implemented with a bridge structure, which can increase the radiation range of the electromagnetic signal of the detection coil 141, so that when the stability test of the dental implant is measured, it is not necessary to be close to the amorphous alloy strip 21, so that the test is more convenient and accurate.

[0052] The input end of the signal processing circuit 133 is the second input end of the control unit 13, and the output end of the signal processing circuit 133 is electrically connected to the second input end of the main control module 131; the second output end of the main control module 131 is the second output end of the control unit 13. The signal processing circuit 133 is used to extract the detection signal on the detection coil 141 and send it to the main control module 13. Exemplarily, the signal processing circuit 133 can be composed of a dedicated chip, or can be designed by combining MOSFET, IGBT, triode, etc.

[0053] Optionally, the control unit 13 further includes a wireless signal terminal; the dental implant stability test device further includes: a wireless communication module 16; the wireless communication module 16 is also located in the housing 15. The wireless communication module 16 is electrically connected to the wireless signal terminal of the control unit 13. The control unit 13 can transmit the stability test results to a terminal such as a mobile phone through the wireless communication module 16, so that medical personnel can analyze and save the stability data. Exemplarily, the wireless communication module 16 can be a WiFi module.

[0054] Optionally, the dental implant stability testing device may further include a charging circuit 17 for charging the battery 11, thereby avoiding the need for frequent battery replacement operations and ensuring that the device battery can be recycled, which is beneficial to environmental protection.

[0055] For the unit under test 20, illustratively, the metal base 22 is a cylinder, and the amorphous alloy strip 21 includes multiple pieces of amorphous alloy, which are evenly distributed on the outer surface of the metal base 22. For example, a total of four pieces of amorphous alloy are glued to the outer surface of the cylinder on the upper part of the metal base 22, symmetrically distributed at an angle of 90 degrees, and are used to apply excitation in four directions to the dental implant, so that the test result is more accurate.

[0056] For the detection coil 141, the device of the present invention adopts only a single coil. Compared with other double-coil solutions, this method is simpler and more accurate.

[0057] Furthermore, the structure of the signal driving circuit is explained in the embodiment of the present invention. Figure 3 , Figure 3 1 is a circuit diagram of a signal driving circuit provided by an embodiment of the present invention. Figure 3 As shown, the signal driving circuit includes: a driving chip U1, a first amplifier AMP1, a second amplifier AMP2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first output terminal P1;

[0058] The input terminal IN1 of the driver chip U1 is electrically connected to the first output terminal of the main control module, and receives the control signal Vct1. The reference input terminal REFIN1 of the driver chip U1 receives the reference signal VREF, the output terminal OUT1 of the driver chip U1 is electrically connected to the first input terminal of the first amplifier AMP1, the second input terminal of the first amplifier AMP1 is electrically connected to the output terminal of the first amplifier AMP1, and the output terminal of the first amplifier AMP1 is electrically connected to the first terminal 1 of the first output terminal P1.

[0059] The first resistor R1 is connected between the output terminal OUT1 of the driving chip U1 and the second input terminal of the second amplifier AMP2, and the second resistor R2 is connected between the second input terminal of the second amplifier AMP2 and the output terminal of the second amplifier AMP2. The first end of the third resistor R3 is electrically connected to the first input terminal of the second amplifier AMP2, and the second end of the third resistor R3 is grounded; the fourth resistor R4 is connected between the reference input terminal REFIN1 of the driving chip U1 and the first input terminal of the second amplifier AMP2, and the output terminal of the second amplifier AMP2 is electrically connected to the second end 2 of the first output terminal P1; the first output terminal P1 is used to be electrically connected to the first end of the detection coil.

[0060] The first resistor R1 , the third resistor R3 and the fourth resistor R4 are all used to protect the second amplifier AMP2 from being damaged.

[0061] Further, see Figure 4 , Figure 4 FIG. 1 is a circuit diagram of another signal driving circuit provided by an embodiment of the present invention. Figure 4 , the driver chip can use the second driver chip U2. The input end of the second driver chip U2 includes four terminals, namely SCLK1, DIN1, DOUT1 and CS1; at the same time, the control signal sent by the main control module is also divided into four analog voltage signals IO1, IO2, IO3 and IO4, which correspond to the four terminals of the input end of the second driver chip U2. The second driver chip U2 also includes a power supply terminal VDD1, which is connected to the power supply signal VCC; the second driver chip U2 also includes a ground terminal AGND1 that is directly grounded. The reference input terminal REFIN2 of the second driver chip U2 is connected to the reference signal VREF. The output end of the second driver chip U2 is OUT2. The first power supply terminal of the first amplifier AMP1 is connected to the power supply signal VCC, and the second power supply terminal is connected to the negative power supply signal -VCC.

[0062] The signal driving circuit further includes: a first inductor L1 and a second inductor L2; the first inductor L1 is connected between the output end of the first amplifier AMP1 and the first end 1 of the first output terminal P1; the second inductor L2 is connected between the output end of the second amplifier AMP2 and the second end 2 of the first output terminal P. The first inductor L1 and the second inductor L2 are detection coil compensation inductors.

[0063] Furthermore, the main control module further includes a third output terminal; the signal outputted by the third output terminal of the main control module is divided into four parts: IO7, IO8, IO9, and IO10. The first output terminal P1 further includes a third terminal 3 and a ground terminal 4. The ground terminal 4 of the first output terminal P1 is grounded.

[0064] The signal driving circuit may also include a DC bias part to reduce the influence of external interference signals. Figure 4 , the signal driving circuit further includes: a bias chip U3;

[0065] The input end of the bias chip U3 includes four terminals, namely: SCLK2, DIN2, DOUT2 and CS2; which are electrically connected to the third output end of the main control module, and receive the signals of the four parts one by one. The reference input end REFIN3 of the bias chip U3 receives the reference signal VREF, and the output end OUT3 of the bias chip U3 is electrically connected to the third end 3 of the first output terminal P1.

[0066] Furthermore, the bias chip U3 further includes a power terminal VDD2 and a ground terminal AGND2, wherein the power terminal VDD2 is connected to the power signal VCC, and the ground terminal AGND2 is grounded.

[0067] The control signals IO1-IO4 control the second driver chip U2 to output an analog voltage signal, which is amplified by two symmetrical operational amplifiers and applied to the detection coil. The signal IO7-IO10 ports control the bias chip U3 to output the bias voltage, thereby changing the size of the DC bias signal. The bias voltage is also applied to the detection coil through a wire to reduce the influence of external interference signals.

[0068] Further, see Figure 5 , Figure 5 is a circuit diagram of a signal processing circuit provided by an embodiment of the present invention. Figure 5 , the signal processing circuit includes: an input terminal P2, an operational amplifier U4, an effective value calculation chip U5, a second output terminal P3, a first capacitor C1 and a second capacitor C2;

[0069] The input terminal P2 is used to be electrically connected to the second end of the detection coil; the first end 5 of the input terminal P2 is electrically connected to the first input end of the operational amplifier U4, and the second input end of the operational amplifier U4 is electrically connected to the output end OUT4 of the operational amplifier U4; the output end OUT4 of the operational amplifier U4 is electrically connected to the first input end IN2 of the effective value calculation chip U5, and the second input end IN3 of the effective value calculation chip U5 is connected to the power supply signal VCC; the first end of the first capacitor C1 is electrically connected to the second input end IN3 of the effective value calculation chip U5, and the second end of the first capacitor C1 is grounded; the first output end OUT5 of the effective value calculation chip U5 is electrically connected to the first end 6 of the second output terminal P3, and the second output end OUT6 of the effective value calculation chip U5 is electrically connected to the second end 7 of the second output terminal P3; the second output terminal P3 is used to be electrically connected to the second input end of the main control module; the second capacitor C2 is connected between the first output end OUT5 of the effective value calculation chip U5 and the second output end OUT6 of the effective value calculation chip U5.

[0070] The detection signal of the detection coil is input to the signal processing circuit through the input terminal P2, filtered and level converted by the operational amplifier U4, and the converted voltage signal is input to the effective value calculation chip U5. The signal output by the effective value calculation chip U5 is input to the main control module through the second output terminal P3.

[0071] Further, Figure 6 FIG. 1 is a circuit diagram of another signal processing circuit provided by an embodiment of the present invention. Figure 6 As shown, the signal processing circuit further includes: a fifth resistor R5, a third capacitor C3, a sixth resistor R6 and a seventh resistor R7; all of which serve as protection for the effective value calculation chip.

[0072] The fifth resistor R5 and the third capacitor C3 are connected in series between the output end of the operational amplifier and the first input end of the effective value calculation chip; the first end of the sixth resistor R6 is connected to the power signal VCC, and the second end of the sixth resistor R6 is electrically connected to the second input end of the effective value calculation chip; the seventh resistor R7 is connected in parallel to both ends of the first capacitor C1.

[0073] Preferably, the operational amplifier can use a high-bandwidth operational amplifier U6 to improve the amplification accuracy and capability. The high-bandwidth operational amplifier U6 has four built-in amplifiers (amplifier A, amplifier B, amplifier C and amplifier D). Excluding the power supply terminal V+ and the ground terminal V-, its ports are +INA, -INA, OUTA; +INB, -INB, OUTB; +INC, -INC, OUTC and +IND, -IND, OUTD. Among them, amplifier A and amplifier D are used for collecting detection signals and output; amplifier B and amplifier C are used for AC input and output. The second end 8 of the input terminal P2 provides an AC input AC in for the high-bandwidth operational amplifier U6, and the AC output AC out is output by amplifier C.

[0074] In order to ensure that the high-bandwidth operational amplifier U6 can work normally and protect it, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15 are also configured.

[0075] Optionally, the effective value calculation chip can be an effective value chip U7. The effective value chip U7 includes a first input terminal IN4, a second input terminal IN5, a ground terminal 6ND, an enable terminal EN, a power terminal V, a first output terminal Vo and a second output terminal VoRTN, wherein the first output terminal Vo outputs a first signal RMSout, and the second output terminal VoRTN outputs a second signal optRMSrtn.

[0076] To protect the effective value chip U7, the circuit is further configured with an eighth resistor R8, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6 and a seventh capacitor C7.

[0077] The embodiment of the present invention further provides a dental implant stability testing method, which is applicable to the dental implant stability testing device provided by any embodiment of the present invention and has corresponding beneficial effects.

[0078] See also Figure 7 , Figure 7 FIG. 1 is a flow chart of a method for testing the stability of a dental implant provided by an embodiment of the present invention. Figure 7 As shown, the dental implant stability testing method comprises the following steps:

[0079] S11. Installing the unit under test on the dental implant.

[0080] Specifically, medical personnel install the unit under test on the dental implant by using a special medical tool, wherein the dental implant is connected to the metal base by threads.

[0081] S12, close the switch in the human-machine interaction unit to power the test handset through the battery.

[0082] Specifically, the medical staff can click a mechanical switch, or a control unit can automatically control the switch to close. The medical staff moves the front end of the device to the inside of the patient's mouth.

[0083] S13: Move the test handset to a position less than a first distance from the unit under test.

[0084] Specifically, the medical staff moves the front end of the test handheld device of the device into the patient's oral cavity. Preferably, in order to ensure the test accuracy, the first distance is less than 2 mm.

[0085] S14, the control unit applies a detection coil driving signal to the detection coil, wherein the detection coil driving signal generates a changing magnetic field in a space surrounding the detection coil;

[0086] Wherein, the detection coil driving signal is a variable frequency and variable amplitude voltage signal.

[0087] S15. The changing magnetic field excites the amorphous alloy strip of the measured unit to vibrate and form an induction signal.

[0088] S16: The detection coil senses the induction signal, generates a detection signal according to the induction signal, and transmits it to the control unit.

[0089] S17: The control unit generates a test result according to the detection signal and transmits the test result to the touch screen of the human-computer interaction unit.

[0090] S18. The touch screen displays the test result.

[0091] Preferably, in order to more accurately measure the stability value, medical personnel can perform multiple measurements from different angles and positions to obtain an average value.

[0092] For the parts not described in detail in this embodiment, please refer to Figure 1-Figure 6 The embodiments shown in this embodiment and the above embodiments can be referenced to each other and will not be described in detail here.

[0093] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A dental implant stability testing device, characterized in that: include: Test handsets and units under test; The test handheld device includes: a battery, a signal sending and detection unit, a control unit and a human-computer interaction unit; the unit under test includes a metal base and an amorphous alloy strip; the amorphous alloy strip is adhered to the outer surface of the metal base; the unit under test is used to be fixed on the dental implant when the stability of the dental implant needs to be tested, and transmits an induction signal to the signal sending and detection unit through electromagnetic induction; the positive electrode of the battery is electrically connected to the first input end of the human-computer interaction unit, and the negative electrode of the battery is electrically connected to the second input end of the human-computer interaction unit; the signal sending and detection unit includes a magnetic rod and a detection coil; the detection coil is wound on the magnetic rod; the first end of the detection coil is the input end of the signal sending and detection unit , electrically connected to the first output end of the control unit; the second end of the detection coil is the output end of the signal sending and detection unit, and is electrically connected to the second input end of the control unit; the signal sending and detection unit is used to excite the vibration of the amorphous alloy strip, and generate a detection signal according to the induction signal; the control unit is used to control the working state of the signal sending and detection unit, and obtain a test result according to the detection signal; the output end of the human-machine interaction unit is electrically connected to the first input end of the control unit; the third input end of the human-machine interaction unit is electrically connected to the second output end of the control unit; the human-machine interaction unit is used to be turned on when the stability of the dental implant needs to be tested, and to display the test result; Wherein, the human-machine interaction unit comprises: a switch, a voltage conversion circuit and a touch screen; the switch is connected to the voltage conversion circuit; the first input end of the voltage conversion circuit is the first input end of the human-machine interaction unit, and the second input end of the voltage conversion circuit is the second input end of the human-machine interaction unit; the output end of the voltage conversion circuit is the output end of the human-machine interaction unit; the input end of the touch screen is the third input end of the human-machine interaction unit; The control unit comprises: a main control module, a signal driving circuit and a signal processing circuit; the first input end of the main control module is the first input end of the control unit; the first output end of the main control module is electrically connected to the input end of the signal driving circuit, and the output end of the signal driving circuit is the first output end of the control unit; the input end of the signal processing circuit is the second input end of the control unit, and the output end of the signal processing circuit is electrically connected to the second input end of the main control module; the second output end of the main control module is the second output end of the control unit; The signal driving circuit includes: a driving chip, a first amplifier, a second amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor and a first output terminal; the input end of the driving chip is electrically connected to the first output end of the main control module, the reference input end of the driving chip is connected to the reference signal, the output end of the driving chip is electrically connected to the first input end of the first amplifier, the second input end of the first amplifier is electrically connected to the output end of the first amplifier, and the output end of the first amplifier is electrically connected to the first end of the first output terminal; the first resistor is connected between the output end of the driving chip and the second input end of the second amplifier, the second resistor is connected between the second input end of the second amplifier and the output end of the second amplifier, the first end of the third resistor is electrically connected to the first input end of the second amplifier, and the second end of the third resistor is grounded; the fourth resistor is connected between the reference input end of the driving chip and the first input end of the second amplifier, and the output end of the second amplifier is electrically connected to the second end of the first output terminal; the first output terminal is used to be electrically connected to the first end of the detection coil.

2. The dental implant stability testing device according to claim 1, characterized in that: The signal driving circuit further includes: a first inductor and a second inductor; the first inductor is connected between the output end of the first amplifier and the first end of the first output terminal; the second inductor is connected between the output end of the second amplifier and the second end of the first output terminal.

3. The dental implant stability testing device according to claim 1, characterized in that: The main control module also includes a third output terminal; the first output terminal also includes a third terminal; the signal driving circuit also includes: a bias chip; the input end of the bias chip is electrically connected to the third output end of the main control module, the reference input end of the bias chip is connected to the reference signal, and the output end of the bias chip is electrically connected to the third end of the first output terminal.

4. The dental implant stability testing device according to claim 1, characterized in that: The signal processing circuit includes: an input terminal, an operational amplifier, an effective value calculation chip, a second output terminal, a first capacitor and a second capacitor; the input terminal is used to be electrically connected to the second end of the detection coil; the first end of the input terminal is electrically connected to the first input end of the operational amplifier, and the second input end of the operational amplifier is electrically connected to the output end of the operational amplifier; the output end of the operational amplifier is electrically connected to the first input end of the effective value calculation chip, and the second input end of the effective value calculation chip is connected to the power supply signal; the first end of the first capacitor is electrically connected to the second input end of the effective value calculation chip, and the second end of the first capacitor is grounded; the first output end of the effective value calculation chip is electrically connected to the first end of the second output terminal, and the second output end of the effective value calculation chip is electrically connected to the second end of the second output terminal; the second output terminal is used to be electrically connected to the second input end of the main control module; the second capacitor is connected between the first output end of the effective value calculation chip and the second output end of the effective value calculation chip.

5. The dental implant stability testing device according to claim 4, characterized in that: The signal processing circuit also includes: a fifth resistor, a third capacitor, a sixth resistor and a seventh resistor: the fifth resistor and the third capacitor are connected in series between the output end of the operational amplifier and the first input end of the effective value calculation chip; the first end of the sixth resistor is connected to the power supply signal, and the second end of the sixth resistor is electrically connected to the second input end of the effective value calculation chip; the seventh resistor is connected in parallel to both ends of the first capacitor.

6. The dental implant stability testing device according to claim 1, characterized in that: The control unit further comprises a wireless signal terminal; the dental implant stability testing device further comprises: a wireless communication module; the wireless communication module is electrically connected to the wireless signal terminal of the control unit.

7. A method for testing the stability of a dental implant, characterized in that: The following steps are involved: A unit under test is installed on a dental implant; a switch in a human-machine interaction unit is closed so that a test handheld device is powered by a battery; the test handheld device is moved to a position less than a first distance from the unit under test; a control unit applies a detection coil drive signal to the detection coil, and the detection coil drive signal generates a changing magnetic field in the space around the detection coil; wherein the detection coil drive signal is a variable frequency and variable amplitude voltage signal; the changing magnetic field excites the amorphous alloy strip of the unit under test to vibrate to form an induction signal; the detection coil senses the induction signal, and generates a detection signal based on the induction signal and transmits it to the control unit; the control unit generates a test result based on the detection signal and transmits it to the touch screen of the human-machine interaction unit; the touch screen displays the test result.

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