RU2226115C2 - Electric stimulation device - Google Patents

Abstract

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

Description

Description text in facsimile form (see graphic part).

Claims (3)

1. An electrical stimulator containing a microprocessor control unit MBU, the first, second and third digital-to-analog converters (DAC1, DAC2, DAC3), a controlled generator (UG), a polarity inverter (IP), a multi-channel analog signal switch (MK), an adder amplifier (US ), a controlled resistor (UR), an amplitude regulator (RA), a power amplifier (UM), a blocking unit (UB), an initial-current protection unit (NTZ), a two-position switch (K), a logical inverter (I), a maximum current protection (MTZ) and a resistor (R), characterized in that a low address reflector (YES), random access memory (BOP), read-only memory (BPP), parameter recording unit (BZP), combined digital display (KCD), current amplitude regulator (PAT), one-shot unit (OV) and diode (VD1 ), while the information inputs / outputs of the MBU are connected to the information inputs / outputs of the BOP and BZP, the inputs of the CDC, DAC1, DAC2, DAC3 and the outputs of the BPP, the first, second and third outputs of the MBU control are connected to the address inputs YES, the outputs of the RF and CT MBU connected to the same inputs YES, first, second, third, fourth, fifth, sixth and seventh outputs whose odes are connected to the control inputs respectively BZP, KCD, DAC1, DAC2, DAC3, BOP and BPP, the fourth, fifth and sixth outputs of the MBU are connected to the control inputs of the MC, the seventh output of the MBU is connected to the anode of the diode VD1, the cathode of which is connected to the control input of the UR , the DAC2 output is connected to the second UG input, the US output is connected to the PAT input, the output of which is connected to the second UM input, the first input of which is connected to the electrode, cathode, UB current output and the resistor R output, the other terminal of which is connected to the common wire, the output PA is connected to the current input of the block MTZ, the current output of which is connected to the input of the key K, the normally open contact of which is connected to the anode electrode and the current input of the UB, the control input of which is connected to the control output of the key K, and the control output of the MTZ unit is connected to the normally open contact of the STOP button related to controls, the control key input K and the input of the OB block, the output of which is connected to the initial installation bus (SHNU) of the MBU block. 2. The pacemaker according to claim 1, characterized in that a diode bridge VD1, an optodinistor VD2, an arrow current indicator R1 and a resistor R2 are introduced into the MTZ block, while the anode terminal VD1 is connected to the second terminal of the resistor R1 and the cathode of the emitter VD2, the cathode terminal VD1 connected to the positive terminal of indicator P1, the negative terminal of which is connected to the first terminal R1, the third terminal of which is connected to the anode of the emitter VD2, the cathode of the receiver of which is connected to the common wire, and the anode, which is the control output of the MTZ unit through resistor R2, is connected to the voltage source eniya + 5V. 3. The pacemaker according to claim 2, characterized in that the current amplitude regulator PAT consists of two variable resistors R1 and R2, the first output of the resistor R1 being the PAT input, the second being the PAT output, the third terminal R1 connected to the first terminal R2, the second and the third conclusions of which are connected to a common wire.

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