Root canal length measuring method and root canal length measuring instrument

A root canal length measurement and root canal technology, applied in medical science, dentistry, etc., can solve problems such as capacitance or resistance deviation, inconsistent test results, etc., and achieve consistent test results
CN109199625BActive Publication Date: 2021-03-19汕尾市葆丰医疗器械有限公司
6 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
汕尾市葆丰医疗器械有限公司
Publication Date
2021-03-19

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a root canal length measuring method and a root canal length measuring instrument. The method is carried out by the root canal length measuring instrument. The method comprisesthe following steps: receiving a preset period PWM signal inputted from the outside; alternately forming a first high frequency signal with a first sub-period and a second low frequency signal with asecond sub-period; performing voltage amplitude reduction processing on the pwm to respectively obtain a second high frequency signal and a second low frequency signal after the voltage amplitude reduction; applying a second high frequency signal and a second low frequency signal to the tip of the root canal length measuring instrument; acquiring the attenuated second high frequency signal and the attenuated second low frequency signal; determining the root canal length based on the attenuated second high frequency signal and the attenuated second low frequency signal. The method and the instrument can skillfully avoid the influence of the deviation of the hardware parameters on the voltage amplitude when the frequency selection circuit is used, and then the influence on the test results.So that the results of root canal length tester produced by the manufacturer can be consistent.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of electronic measurement, in particular to a root canal length measuring method and a root canal length measuring instrument. Background technique

[0002] The root canal length measuring instrument, referred to as the root measuring instrument, is a precision electronic instrument used to measure the working length of the root canal. Through the guidance of the root tester, compared with the traditional root canal length x-ray measurement method, the accuracy can be higher, so that doctors can accurately grasp the root canal length to achieve perfect filling.

[0003] Most of the current root canal measurements are based on the impedance principle. That is, in 1958, Sunada found that the resistance value between the human periodontal ligament and the oral mucosa was constant, about 6.5k ohms, and was used to measure the working length of the root canal. But in the actual test process, it will be found th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More