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

FIELD: medical engineering; physiotherapy. SUBSTANCE: device has signal former using 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, and other dataway serves to connect controller output to output of keyboard unit. First output of signal former is connected through dataway to first input of pulse- width modulator. Device includes inverter connected with its first input to output of pulse-width modulator and with its output, to selective filter input. Device has output terminal, and input terminals of DC voltage, Second terminal is common bus, and first terminal is connected to third input of pulse-width modulator and to input of DC voltage converter, first output of which is connected to signal former input and second output, to second input of pulse-width modulator. Device also includes channel switch, current transformer, as well as inverters, selective filters and output terminals of second, third and fourth channels. In addition to first inverter, output of pulse-width modulator is connected to first inputs of newly introduced inverters, outputs of which are connected to inputs of newly introduced selective filters. Second output of signal former is connected to channel switch input through dataway, n outputs of channel switch are connected to second inputs of n inverters, respectively. Selective filter outputs of n channels are connected to respective inputs of current transformer, outputs of which are connected directly to output terminals of correspond-channels of device. Feedback signal output of current transformer is connected to fourth input of pulse-width modulator. Device can operate in single- and multi-channel modes. EFFECT: extended functional capabilities, higher efficiency of therapeutic action. 1 dwg