Patent ID: 11896358
Assignee: WELLNESS ALLIED INC
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A skin impedance measuring device, comprising:
an adjustable voltage output unit, configured to output step-function DC voltages with adjustable magnitudes, which are conducted to a local skin area through electrodes to form forward or reverse voltages; or configured to output AC voltages with adjustable magnitudes and frequencies, which are conducted to a local skin area through electrodes to form alternating voltages; and
the adjustable voltage output unit comprises one or more of the following devices —waveform generator, digital signal generator with digital-to-analog converter (DAC); and, a current-drive circuit, activated when the magnitude of the driving current is below a predetermined threshold;
an electrode system, having at least two electrodes placed at measurement points on the skin to conduct the voltages from the adjustable voltage output unit to related measurement points;
a skin impedance measurement unit, configured to measure electrical signals from the measurement points, thereby obtaining the skin impedance;
a microcontroller processor; and
a computing memory, which stores instructions executed by the microcontroller processor;
when the instruction is executed by the microcontroller processor, the following steps are executed:
calculating the difference between a forward skin impedance measured using a forward DC voltage and a reverse skin impedance measured using a reverse DC voltage;
determining whether measurement results are abnormal by continuously measuring the forward skin impedances, the reverse skin impedances, and their differences;
correcting abnormal results by adjusting the magnitudes and time durations of the DC voltages, and/or applying additional AC voltages of adjustable frequencies and magnitudes of AC voltages;
remeasuring the skin impedances to check if the differences between the forward skin impedance and the reverse skin impedance are reduced to a preset threshold to ensure an accuracy of the measurement data; and
a display unit for displaying measurement results.