ELECTRIC STIMULATION DEVICE Russian patent published in 2004 - IPC

FIELD: medical engineering. SUBSTANCE: device has micro-processor-driven control unit for concurrently forming four independent binary code sequences varying according to predefined laws. The first sequence acts upon frequency-controlled harmonic oscillator output of which is connected to the first channel of multi-channel commutator. After having been transformed, the second sequence varying for instance according to infra-low frequency wave envelope law comes to the second input of frequency-controlled harmonic oscillator, to the second multi-channel commutator channel and polarity inverter which output is connected to the third multi-channel commutator channel. The third combination is used for controlling multi-channel commutator channel commutation and allows producing any initial signal combinations of both harmonic and enveloping signals of positive and negative polarity. The signals come to summing inputs of summator-amplifier, amplification coefficient Q of which is variable under low frequency analog signal control. The signal is produced by transforming the fourth binary numbers sequence. The device reproduces most of currents applicable in electric therapy and enables one to produce and test new promising types thereof by modulating and superimposing signals of any shape. Maximum current protection unit ensures therapeutic current restriction control at any maximum-permissible level causing avalanche-like operation of maximum current protection unit optodinister causing operation of two independent multi-level patient protection systems. Locking unit is arranged in parallel to patient circuit to allow practically immediate locking of patient circuit current by invoking short-circuit condition between electrodes. Monovibrator resets the micro-processor-driven control unit into initial state producing in this way practically zero magnitude master voltage at amplitude control unit output to protect both patient and power amplifier output channels of modulation and locking units. Key breaks patient circuit via inverter under double maximum current protection unit and micro- processor-driven control unit signal action to accomplish protection system operation. EFFECT: high safety level of stimulation; wide range of functional applications. 3 cl, 9 dwg