Detection device for tooth root tip positioning instrument

Abstract

The utility model belongs to the technical field of dental medical equipment, and relates to a detection device for a root apex locator, the detection device comprises a first terminal, a second terminal, a control circuit and an RC circuit, the RC circuit is connected between the first terminal and the second terminal, the control circuit is connected with the RC circuit, the control circuit is used for adjusting the output resistance of the RC circuit, and the RC circuit is connected with the control circuit. The root canal environment impedance of the root canal file entering from a root canal orifice to exceeding an apical foramen is simulated; the RC circuit comprises a digital potentiometer R1 and a capacitor C, the digital potentiometer R1 comprises a communication pin, a first output pin and a second output pin, the communication pin is connected with the control circuit, the first output pin is connected with the first terminal, the second output pin is connected with the capacitor C, and the second terminal is connected with the capacitor C. According to the technical scheme, the output resistance of the digital potentiometer can be adjusted through the control circuit so as to analyze the detection accuracy of the tooth root tip positioning instrument, analysis is convenient, and the result is accurate.

Description

Technical Field

[0001] The present application relates to the technical field of dental medical instruments, and more specifically, to a detection device for a tooth apex locator. Background Art

[0002] Accurately measuring the working length of the root canal is a prerequisite for successful root canal treatment. The commonly used medical device for measuring the length of the root canal of a tooth is the apex locator, which includes a root canal file and a lip hook connected to a measuring electrode. When in use, the lip hook is hung on the lips, the root canal file is inserted into the exposed root canal and the root canal file is moved downward. During the movement of the root canal file, the apex locator will display the position of the apex of the root canal file in the root canal. When the root canal file locator shows that it has reached the apex point, the length of the root canal file entering the root canal is the actual length of the root canal.

[0003] Since the tooth root canal can be equivalent to an impedance model of a resistor and a capacitor in series, the traditional method for measuring the accuracy of the root apex locator is to use a fixed resistor or an adjustable resistor in series with a fixed capacitor to form an RC circuit, and connect the RC circuit in series between the two measuring electrodes of the root apex locator. However, the use of fixed resistors in the traditional measurement method requires frequent replacement of fixed resistors with different resistance values ​​to meet the accuracy measurement requirements of the root apex locator within the entire root canal length range, which is cumbersome to operate. Although the use of adjustable resistors can meet the measurement requirements of the root apex locator for the entire root canal length range, it is impossible to accurately read the resistance value, and the result is inaccurate. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing detection device cannot simultaneously meet the requirements of measuring the accuracy of the tooth apex locator and taking into account the measurement range.

[0005] In order to solve the above technical problems, the utility model provides a detection device for a tooth apex locator, which adopts the following technical solution:

[0006] A detection device for a tooth apex locator, comprising a first terminal and a second terminal, a control circuit and an RC circuit, wherein the RC circuit is connected between the first terminal and the second terminal, and the control circuit is connected to the RC circuit, wherein the control circuit is used to adjust the output resistance of the RC circuit to simulate the root canal environmental impedance of a root canal file from entering the root canal orifice to exceeding the root apex;

[0007] The RC circuit includes a digital potentiometer R1 and a capacitor C. The digital potentiometer R1 includes a communication pin, a first output pin and a second output pin. The communication pin is connected to the control circuit. The first output pin is connected to the first terminal. The second output pin is connected to the capacitor C. The second terminal is connected to the capacitor C.

[0008] Furthermore, the output resistance range of the digital potentiometer R1 is 2 kΩ to 10 kΩ.

[0009] Furthermore, one of the first terminal and the second terminal is connected to the root canal file of the tooth apex locator, and the other is connected to the lip hook of the tooth apex locator.

[0010] Furthermore, the control circuit includes a microcontroller, and the digital potentiometer R1 is connected to the microcontroller.

[0011] Furthermore, the control circuit also includes a pull-up resistor R2, and the pull-up resistor R2 is connected between the microcontroller and the digital potentiometer R1.

[0012] Furthermore, the resistance of the pull-up resistor R2 is 10 kΩ to 47 kΩ.

[0013] Furthermore, the control circuit also includes a display screen, which is connected to the microcontroller to display the current resistance value selected by the microcontroller.

[0014] Furthermore, the control circuit also includes at least one control button, which is connected to the microcontroller to control the microcontroller to adjust the output resistance of the digital potentiometer R1.

[0015] Furthermore, the control circuit also includes a pull-up resistor R3, which is connected between the microcontroller and the control button.

[0016] Furthermore, the resistance of the pull-up resistor R3 is 10 kΩ to 47 kΩ.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model adopts a digital potentiometer R1 and a capacitor C to form an RC circuit, and changes the output resistance of the digital potentiometer R1 through a control circuit to simulate the root canal environmental impedance of the root canal file from the root canal orifice to beyond the apical foramen, thereby meeting the accuracy measurement range requirement of the entire root canal length of the tooth apex locator, and the operation is convenient; at the same time, because the digital potentiometer R1 is controlled by the digital input of the control circuit, thereby generating an analog output resistance, it is possible to obtain an accurate input resistance value, thereby improving the measurement accuracy of the tooth apex locator; the utility model, through the setting of the digital potentiometer R1, meets the requirements of both the measurement range and the accuracy of the result, and the operation is simple, the analysis is convenient, and the result is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the scheme of the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a circuit diagram of a detection device according to an embodiment of the utility model;

[0021] Figure 2 yes Figure 1 Circuit diagram of the control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 1. First wiring terminal; 2. Second wiring terminal; 3. Control circuit; 31. Microcontroller; 32. Display screen; 33. Control button; 4. RC circuit. DETAILED DESCRIPTION

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0025] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] The root canal is surrounded by insulating dentin and cementum, wherein an apical foramen is formed between the dentin and cementum at the bottom of the tooth. The root canal is connected to the periodontal ligament located outside the dentin through the apical foramen. The root canal contains a resistor material with a specific resistivity (the resistor material is composed of dentin, tissue and liquid).

[0027] The working principle of the apex locator is that the lip hook is hung on the lip and electrically connected to the periodontal ligament. The root canal file passes through the dentin from above the tooth and enters the root canal. As the root canal file moves in the root canal toward the apical foramen, the effective length of the resistance material in the root canal decreases, so the resistance between the end of the root canal file and the apical foramen gradually decreases. Therefore, the smaller the resistance, the longer the length of the root canal file entering the root canal.

[0028] Based on the above tooth structure and the working principle of the apex locator, please refer to Figure 1 As shown, the utility model provides a detection device for a tooth apex locator, and the detection device is used to measure the accuracy of the tooth apex locator.

[0029] In some embodiments, the detection device includes a first terminal 1, a second terminal 2, a control circuit 3 and an RC circuit 4, wherein one of the first terminal 1 and the second terminal 2 is connected to a root canal file (not shown in the figure) of the root apex locator (not shown in the figure), and the other is connected to a lip hook (not shown in the figure) of the root apex locator.

[0030] In this embodiment, the first terminal 1 is connected to the root canal file of the root apex locator, the second terminal 2 is connected to the lip hook of the root apex locator, the RC circuit 4 is connected between the first terminal 1 and the second terminal 2, the control circuit 3 is connected to the RC circuit 4, and the control circuit is used to adjust the output resistance of the RC circuit 4 to simulate the root canal environmental impedance of the root canal file from entering the root canal orifice to beyond the apical foramen.

[0031] In some embodiments, the RC circuit 4 includes a digital potentiometer R1 and a capacitor C, the digital potentiometer R1 includes a communication pin, a first output pin and a second output pin, the communication pin is connected to the control circuit 3, the first output pin is connected to the first terminal 1, the second output pin is connected to the capacitor C, and the second terminal 2 is connected to the capacitor C.

[0032] The utility model adopts a digital potentiometer R1 and a capacitor C to form an RC circuit 4, and changes the output resistance of the digital potentiometer R1 through the control circuit 3 to simulate the root canal environmental impedance of the root canal file from the root canal orifice to the root apex, thereby meeting the accuracy measurement range of the entire root canal length of the tooth apex locator, and the operation is convenient; at the same time, because the digital potentiometer R1 is controlled by the digital input of the control circuit 3, thereby generating an analog output resistance, it is possible to obtain an accurate input resistance value, thereby improving the measurement accuracy of the tooth apex locator; the utility model, through the setting of the digital potentiometer R1, takes into account the requirements of both the measurement range and the accuracy of the result, and is simple to operate, convenient to analyze, and accurate in the result.

[0033] In some embodiments, the output resistance range of the digital potentiometer R1 is 2kΩ to 10kΩ. Specifically, in order to adapt to the root canal environmental impedance of the simulated root canal file entering from the root canal orifice to beyond the apical foramen, the output resistance of the digital potentiometer R1 can be set to any one of 2.0kΩ, 3.0kΩ, 4.0kΩ, 5.0kΩ, 6.0kΩ, 7.0kΩ, 8.0kΩ, 9.0kΩ, and 10.0kΩ, or a range formed between any two values.

[0034] In this embodiment, when the apex locator is actually working, the root canal impedance is 9.0 kΩ when the root canal file enters the root canal opening, the root canal impedance is 2.8 kΩ when the root canal reaches the apex point, and the root canal impedance is 2.4 kΩ when the root canal exceeds the apical foramen. Therefore, in this embodiment, the output resistance of the digital potentiometer R1 is set to 2.4 kΩ, 2.8 kΩ, 3.2 kΩ, 3.6 kΩ, 4.5 kΩ, 5.3 kΩ, 6.1 kΩ, 7.2 kΩ, 8.4 kΩ, and 9.0 kΩ, respectively, so as to cover the entire root canal length range of the apex locator and meet the accuracy measurement range of the entire root canal length of the apex locator. Please refer to Figure 2 As shown, in some embodiments, the control circuit 3 includes a microcontroller 31, wherein the microcontroller 31 includes a communication port and an I / O port.

[0035] In some embodiments, the digital potentiometer R1 is connected to the communication port of the microcontroller 31. In this embodiment, the microcontroller 31 controls the digital potentiometer R1 to switch from small to large or from large to small in the above-set output resistance values.

[0036] In some embodiments, the control circuit further includes a pull-up resistor R2, which is connected between the microcontroller 31 and the digital potentiometer R1 to ensure the stability of the communication frequency between the microcontroller 31 and the digital potentiometer R1. The utility model stores the output resistance values ​​of the digital potentiometer in the microcontroller 31, and controls the digital potentiometer R1 to switch among the resistance values ​​listed above through the microcontroller 31, thereby simplifying the resistance adjustment process and improving the efficiency of switching to the corresponding resistance output value, thereby improving the efficiency of accuracy measurement.

[0037] In some embodiments, the resistance of the pull-up resistor R2 can be set to 10kΩ~47kΩ. Specifically, the resistance of the pull-up resistor R2 can be set to any one of 10kΩ, 20kΩ, 30kΩ, 40kΩ, 47kΩ or a range between any two values.

[0038] Please continue reading Figure 2As shown, in some embodiments, the control circuit 3 further includes a display screen 32, and the display screen 32 is connected to the I / O port of the microcontroller 31, and the display screen 32 is used to display the current resistance value selected by the microcontroller.

[0039] The utility model displays the current resistance value selected by the microcontroller 31 through the setting of the display screen 32, so that the user can understand the current resistance value in real time, thereby improving the measurement accuracy of the tooth apex locator.

[0040] Please continue reading Figure 2 As shown, in some embodiments, the control circuit 3 also includes at least one control button 33, and the control button 33 is connected to the I / O port of the microcontroller to control the resistance output selected by the microcontroller 31, thereby adjusting the output resistance value of the digital potentiometer R1.

[0041] In this embodiment, the control circuit 3 includes two control buttons 33, one of which is used to control the digital potentiometer R1 to increase the output resistance, and the other control button 33 is used to control the digital potentiometer R1 to decrease the output resistance. By setting the two control buttons 33, the efficiency of adjusting the resistance output value can be improved.

[0042] In other embodiments, the control circuit 3 includes a control button 33. Each time the control button 33 is triggered, the microcontroller 31 switches the resistance value output to the digital potentiometer R1 in order from small to large. When the output resistance is 9.0kΩ, the control button 33 is triggered again, and the output resistance jumps to 2.4kΩ again, thereby forming a cyclic switching. By simplifying the number of control buttons 33, the operation of adjusting the output resistance is further simplified.

[0043] In other embodiments, the control circuit 3 includes a control button 33. When the control button 33 is triggered by a single click, the microcontroller 31 switches the resistance value output to the digital potentiometer R1 in sequence from small to large; when the control button 33 is triggered by a double click, the microcontroller 31 switches the resistance value output to the digital potentiometer R1 in sequence from large to small, wherein when the time interval between two triggering of the control button is less than 1s, it is a double-click trigger.

[0044] Furthermore, in other embodiments, the control circuit 3 may also be provided with three or more control buttons 33 to meet the requirements of switching the output resistance size by triggering the control button 33, controlling the start-up of the detection device, directory selection, or selecting the model of the root tester to be detected.

[0045] In some embodiments, the control circuit further includes a pull-up resistor R3 , which is connected between the microcontroller 31 and the control button 33 to ensure the stability of the communication frequency between the microcontroller 31 and the control button 33 .

[0046] In some embodiments, the resistance of the pull-up resistor R3 can be set to 10kΩ~47kΩ. Specifically, the resistance of the pull-up resistor R2 can be set to any one of 10kΩ, 20kΩ, 30kΩ, 40kΩ, 47kΩ or a range between any two values.

[0047] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A detection device for a tooth apex locator, characterized in that: It comprises a first terminal and a second terminal, a control circuit and an RC circuit, wherein the RC circuit is connected between the first terminal and the second terminal, the control circuit is connected to the RC circuit, and the control circuit is used to adjust the output resistance of the RC circuit to simulate the root canal environmental impedance of the root canal file from entering the root canal orifice to exceeding the apical foramen; The RC circuit includes a digital potentiometer R1 and a capacitor C. The digital potentiometer R1 includes a communication pin, a first output pin and a second output pin. The communication pin is connected to the control circuit, the first output pin is connected to the first terminal, the second output pin is connected to the capacitor C, and the second terminal is connected to the capacitor C.

2. The detection device for a tooth apex locator according to claim 1, characterized in that: The output resistance range of the digital potentiometer R1 is 2kΩ~10kΩ.

3. The detection device for a tooth apex locator according to claim 1, characterized in that: One of the first terminal and the second terminal is connected to the root canal file of the tooth apex locator, and the other is connected to the lip hook of the tooth apex locator.

4. The detection device for a tooth apex locator according to claim 1, characterized in that: The control circuit includes a microcontroller, and the digital potentiometer R1 is connected to the microcontroller.

5. The detection device for the tooth apex locator according to claim 4, characterized in that: The control circuit further includes a pull-up resistor R2 , and the pull-up resistor R2 is connected between the microcontroller and the digital potentiometer R1 .

6. The detection device for the tooth apex locator according to claim 5, characterized in that: The resistance of the pull-up resistor R2 is 10 kΩ to 47 kΩ.

7. The detection device for a tooth apex locator according to claim 4, characterized in that: The control circuit also includes a display screen, which is connected to the microcontroller to display the current resistance value selected by the microcontroller.

8. The detection device for a tooth apex locator according to claim 4, characterized in that: The control circuit further includes at least one control button, and the control button is connected to the microcontroller to control the microcontroller to adjust the output resistance of the digital potentiometer R1.

9. The detection device for a tooth apex locator according to claim 8, characterized in that: The control circuit further includes a pull-up resistor R3, and the pull-up resistor R3 is connected between the microcontroller and the control button.

10. The detection device for a tooth apex locator according to claim 9, characterized in that: The resistance of the pull-up resistor R3 is 10 kΩ to 47 kΩ.

Images