SU1287841A1 - Apparatus for recording biopotentials in electrostimulation - Google Patents

Abstract

The invention relates to experimental physiology and allows reducing the level of interference from stimulating pulses. The device contains a generator 1, stabilizers 2 and 7, an amplifier 3, a synchronous detector 4, an integrator 5 with an inverting input, a multiplier 6, an indifferent electrode 8 and a microelectrode 9. The microelectrode 9 and in antiphase to the electrode 8 are stimulated. The amplifier 3 contains pulses of the studied cell, recorded by microelectrode 9, and an uncompensated part of the stimulation pulses. At the output of the synchronous detector, there are only uncompensated stimulation pulses arriving at the integrator 5, the voltage from which through the multiplier 6 and the stabilizer 7 is fed to the electrode 8. By selecting the constant time and gain of the integrator 5, the non-compensated part of the pulses is processed by the static automatic control circuit. 1 il. § (Lü from 00

Description

The invention relates to medical technology and can be used in experimental physiology.

The purpose of the invention is to reduce the level of interference from stimulating pulses.

The drawing shows a block diagram of a device for recording biopotentials during electrostimulation.

The device contains series-connected pulse generator 1, first current stabilizer 2, amplifier 3, synchronous detector 4, integrator 5 with inverting output, analog multiplier 6, second current stabilizer 7, indifferent electrode 8, microelectrode 9.

The device works as follows.

The microelectrode 9 is supplied with stimulation pulses from the current stabilizer 2. The antiphasing electrode 8, in antiphase, is stimulated by stimuli from the current stabilizer 7. At the output of the force- bodies 3 there are pulses of the investigated cell, recorded by the microelectrode 9, as well as the uncompensated part of the stimulation pulses. The synchronous detector 4 is opened only for the time of stimulation pulse generation, therefore, at the output of the synchronous detector 4 there is only an uncompensated part of the stimulation pulses. These pulses are applied to an integrator with an inverting output 5. The time constant of this integrator is determined by the value of the integrating capacitor Sim and the resistances of the Cozar. and RoTKp. key of the synchronous detector in the closed and open states. For example, ,

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therefore, the voltage at the output of the integrator is quickly established (in a few pulses) and practically does not change in the interval between the stimulation pulses. The voltage from the output of the integrator 5 with the inverting output is fed to the input of the analog intelligent 6 and the second current stabilizer 7 to the indifferent electrode 8. In general, a static automatic control circuit is obtained, where the uncompensated part of the stimulation pulse is the error signal of this circuit and its magnitude is determined by the coefficient Qu of the amplifier gain, on which integrator 5 is made with an inverting output.

Claims (1)

Invention Formula A device for recording biopotentiality during electrostimulation, containing a series-connected pulse generator, a current stabilizer and an amplifier, an indifferent electrode and a microelectrode connected to the output of a current stabilizer, characterized in that, in order to reduce the level of interference from stimulating pulses, it also contains sequentially connected synchronous detector, the input of which is connected to the output of the amplifier, and the control input to the output of the pulse generator, integrator, analog multiplier, second second input coupled to an output of the pulse generator and the second current regulator, whose output is connected to the indifferent electrode. five 0