Calibration device and method for root canal length measurement instrument

Abstract

The invention relates to a calibration device and method for a root canal length measurement instrument. The calibration device comprises a measurement signal generating circuit, an on-off control circuit, an analog electronic switching circuit, a calibration load circuit and an external measurement circuit, wherein the measurement signal generating circuit is used for generating a current measurement signal, detecting the voltage signal of the calibration load circuit and generating a calibrated current measurement signal; the on-off control circuit is used for controlling the analog electronic switching circuit to be connected to the calibration load circuit or the external measurement circuit; the analog electronic switching circuit is used for outputting the current measurement signal to the calibration load circuit or outputting the calibrated current measurement signal to the external measurement circuit; the external measurement circuit is used for outputting the calibrated current measurement signal to an external root canal file and lip hook circuit. Compared with the prior art, the calibration device has the advantages that the measuring circuit is small in size, the price is low, the failure rate is low, the power consumption is low, the control is simple, the internal structure of the root canal length measurement instrument is more compact, the whole size is smaller, the cost is lower, the function is more reliable, and the calibration accuracy is high.

Description

technical field [0001] The invention relates to a length measuring device, in particular to a calibration device and method for a root canal length measuring instrument. Background technique [0002] The root canal length measuring instrument (referred to as "root tester") is a kind of dental auxiliary equipment used to measure the length of the root canal of the tooth. The actual length of the zone. When the root canal length measuring instrument is used, the root canal file is inserted into the root canal of the tooth, and then the root canal file is connected to the circuit of the root canal length measuring instrument host; the other electrode of the root canal length measuring instrument host is connected to the Lip hook circuit connection. The root canal file emits two currents of different frequencies in the root canal of the tooth. The host measures the ratio of the resistance values ​​of the two currents passing through the root canal (this ratio is not affected b...

AI Technical Summary

Problems solved by technology

The calibration method is to add a calibration circuit to the circuit design of the root tester. In the existing calibration circuit structure, a relay is used to switch the measurement signal generation circuit to the measurement signal calibration circuit or measurement signal output circuit. If the relay is used more times, it will appear The internal resistance of the conduction becomes larger or even poor contact, which reduces the calibration accuracy or even fails, and its overall volume is large and the cost is high, so it is necessary to improve the existing technology

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