| 摘要 |
FIELD: medicine.SUBSTANCE: method for the dual measurement of individual's body area resistance is implemented by means of a rheograph comprising two four-contact sensors (1, 2), a high-frequency signal generator (4) and a processing and display unit (5). The first (6) and second (7) synchronous detectors are also used. The first sensor (1) measures resistance along the arteries and veins of the body area, and the second sensor (2) - across the arteries and veins of the same body area. The radio-frequency voltage of the second signal output of the generator (4) is by 90 degrees phase-shifted in relation to the radio-frequency voltage of the first signal output. The first signal output of the generator (4) supplies voltage to current contacts of the first sensor (1), and the second signal output of the generator (4) - to those of the second sensor (2). The potential contacts of the first sensor (1) supply voltage to the input of the first synchronous detector (6); the potential contacts of the second sensor (2) - to the input of the second synchronous detector (7).The control input of the first synchronous detector (6) is controlled by the first signal output of the generator (4); the control input of the second synchronous detector (7) - to the second signal output of the generator (4). The outputs of the synchronous detectors (6, 7) supply voltage to the inputs of the processing and display unit (5) that calculates a difference signal Ud=U1*k-U2*(1-k) and a sum signal Us=U1*k+U2*(1-k), wherein U1 and U2 are the output signals of the first (6) and second (7) synchronous detectors; the coefficient k falls within the range from 0 to 1 and continuously adjusted by the processing and display unit (5) so that an average value Ud over the time period of 10 seconds equals to zero. If the coefficient k falls within the range from 0 to 0.1 or from 0.9 to 1, the processing and display unit (5) produces a contact sensor failure signal. The processing and display unit (5) calculates the individual's body area resistance Ral along the arteries and veins Ral=Ud/Ial and the resistance Rac across the arteries and veins Rac=Us/Iac, wherein Ial and Iac are radio-frequency currencies flowing through the first and second signal output of the generator (4). The processing and display unit (5) forms a two-dimensional chart, along the vertical axis of which the resistance Ral is plotted, whereas the resistance Racis plotted along the horizontal axis.EFFECT: more accurate measurement of a pulse wave by enabling the recording of individual's resistance variation apart from the pulse wave in vessels and capillary filling variation.1 dwg |
