MULTICHANNEL RHEOGRAPH DEVICE Russian patent published in 1998 - IPC

FIELD: medical engineering. SUBSTANCE: every channel of device has the first and the second analog keys, control inputs of which are connected to the corresponding outputs of decoder. The decoder outputs are connected to counter outputs. Counter input is connected to pulse generator output. Every channel of device also has the first multichannel recorder and current source generator which output is connected to the first input of impedance-to-voltage converter, the second and the third inputs of which are connected to sites on biological object under investigation through the first and the second analog keys of each of the channels, the output being connected to commutator input through higher frequency filter which control inputs are connected to counter outputs. Signal divider is mounted between each commutator and each input of the first multichannel recorder. The signal divider has detector which input is one of the signal divider inputs and the output is connected to input of the first low frequency filter which output is connected to quadrature splitter input which first input is connected to the first inputs of the first and the third multiplier and the second output is connected to the first inputs of the second and the fourth multiplier so that the second and the third low frequency filter are set between output of the first multiplier and the second input of the third one and between output of the second multiplier and the second input of the fourth one, respectively. Outputs of the third and the fourth multiplier are connected to input (subtrahend) of subtracter which minuend input is united with the input of the first low frequency filter and its output is the first output of the signal divider and is connected to the corresponding input of the first multichannel recorder. It is connected to the second input of the first and the second multiplier through amplifier. Output of the first low frequency filter is the second output of the signal divider which is connected to input of the second multichannel recorder. EFFECT: combined reading and recording of respiration and pulse rheograms. 2 dwg