DEVICE FOR LOW-FREQUENCY PHYSIOTHERAPY Russian patent published in 1998 - IPC

FIELD: medical engineering; physiotherapy. SUBSTANCE: device has signal former, pulse-width modulator, output channels, channel switch, inverter, selective filter, current transformer, n electromagnetic relays, DC voltage converter, and two input DC voltage terminals. Signal former uses controller, digital indication unit and keyboard unit. First and second outputs of controller are first and second outputs of signal former, respectively. Third output of controller is connected to input of digital indication unit through dataway. Controller input is connected to keyboard unit output through other dataway. First output of signal former is connected to first output of pulse-width modulator, and second output is connected to channel switch input through dataway. Pulse-width modulator output is connected to current transformer input through series-connected inverter and selective filter. First (power) output of current transformer is connected simultaneously to moving contacts of n electromagnetic relays, which fixed contacts are connected to n output terminals, respectively. n outputs of channel switch are connected to windings of n electromagnetic relays. Second (control) output of current transformer is connected to fourth input of pulse-width modulator. First input terminal of DC voltage is connected simultaneously to third input of pulse-width modulator and to input of DC voltage converter, and second input terminal serves as common bus. First input of DC voltage converter is connected to signal former input and second input, to second input of pulse-width modulator. EFFECT: reduced power consumed by n output channels, simultaneous control of patient's currents in all n channels, improved comfort of treatment procedure for patient. 1 dwg