SU1222282A1 - Electric stimulator - Google Patents

Description

The invention relates to medicine, namely to electrostimulators.

The purpose of the invention is to preserve the effect of anesthesia when using the amplitude of electrical stimuli.

FIG. 1 shows a block diagram of an electrostimulator; in fig. 2 - timing diagrams of voltages at the outputs of individual units.

The electrostimulator contains a master oscillator 1, a divider 2 frequencies, a first one vibrator 3, a pulse shaper 4, a second one vibrator 5, a shaper 6 duration, a modulator 7, a switch 8, an output amplifier 9, a measurement circuit 10, electrodes 11 located on the patient's skin , a first memory circuit 12, a voltage divider 13, a threshold device 14, a second memory circuit 15 and a power source 16.

The timing diagrams contain: U is the voltage from the output of the master oscillator 1; and, - the voltage from the output of the imaging device 4 pulsesJ U - the voltage from the output of the circuit 10 of the measurement Cc voltage from the output of the first circuit 12 of the memory; voltage from the output of the threshold device 14; U is the voltage from the output of the former 6 duration.

The electrostimulator operates as follows.

The pulses of the master oscillator 1 are fed to the divider 2 frequency input. The voltage drop from the divider 2 frequency output triggers the first single-vibrator 3, the output of which forms a rectangular pulse, the leading edge of which triggers the driver 4 of the pulse and the second one-shot 5. At the output of the second one-shot 5, a short pulse is generated, which resets the second memory circuit 15 and, with its falling edge, puts it into the measurement mode. At the same time, the pulse from the clock generator output goes to the control input of the switch 8, which connects the output of the pulse shaper 4 to the input of the output amplifier 9,

The measuring pulse of a rectangular shape through the output amplifier 9 and the measurement circuit 10 is supplied to the electrodes 11 attached to the patient's skin, as well as to the first control input of the first memory circuit 12. From the output of the measurement circuit 10 is removed

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the voltage co-ect to the current flowing through the patient and having the form of an exponent increasing to a certain level.

This voltage is supplied to the signal input of the threshold device 14, to the control input of which, through the voltage divider 13, voltage is supplied from the output of the first memory circuit 12, the measurement obtained in the previous cycle.

At the moment of equality of these two voltages, a rectangular voltage drop is generated at the output of the threshold device 14, which is fed to the first control input of the second memory circuit 15, fixing the value of the measured duration of the transition process in the tissues, as well as to the second control input the first memory circuit 12, transfer it to the sampling mode.

f The rectangular voltage drop is applied to the first control input of the second memory system 15, fixing the value of the measured duration of the transient process in tissues, as well as to the second control input of the first memory 12, switching it to the sampling mode.

At the moment of termination of the measuring pulse, the voltage d from the output of the pulse shaper 4 is fed to the first control input of the first memory circuit 12, transferring it to the storage mode until the next measurement cycle.

A voltage proportional to the duration of the transient process in tissues from the output of the second memory circuit 15 is applied to the control input of the duration generator 6, at the output of which pulses are formed with a duration equal to the duration of the transient process in the tissues.

After the end of the measurement cycle on the falling edge of the clock of the clock generator, the switch 8 connects the output of the modulator 7 to the input of the output 0 amplifier 9, the master oscillator 1

starts the shaper 6 of duration, the pulses through the modulator 7, the switch 8, the output amplifier 9 and the measurement circuit 10 arrive at 5 electrodes 11 attached to the patient's skin.

When changing the duration of the transition process in tissues, due to

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J - 1

For example, by changing the conditions in the electrode location area, a corresponding change in voltage occurs at the output of the second memory circuit 15, which leads to a corresponding change in the duration of the stimulating pulses.

When the amplitude of the acting current increases, for example, the amplitude of the pulses at the output of the measurement circuit tO increases, the voltage at the output of the first memory circuit 12 increases and, consequently, the voltage supplied to the control input of the threshold device 14.

Editor N.Rogulich

Order 1635/4 Circulation 660 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, city of a family, st. Project, 4

222824

Thus, when changing the amplitude of the affecting current, the relative level of operation of the threshold device 14 is maintained, which 5 ensures that errors in determining the duration of the transient process in biological tissue due to the change in the amplitude of the acting pulses are eliminated. In accordance with

10 by this, the duration of the formed action is maintained equal to the duration of the transient process in a large range of amplitudes of the action current, which ensures a decrease in

15 pain sensations under the electrodes.

Compiled by B.Popov

Tehred O. Sopko Corrector. Shekmar

Claims (1)

ELECTRICAL STIMULATOR, comprising a master oscillator, a duration driver, the input of which is connected to the first output of the master oscillator, a series-connected output amplifier, a measurement circuit and electrodes, as well as a threshold device, characterized in that, in order to maintain the effect of anesthesia when the amplitude, electrical stimuli, it is equipped with a series-connected frequency divider, a first one-shot, a pulse shaper and a switch, the output of which is connected to the input of the output amplifier, the first a memory circuit, a voltage divider, the input of which is connected to the output of the first memory circuit, and the output of the threshold device, the second one-shot, a second memory circuit, the input of which is connected to the output of the second one-shot, and the output - to the second input of the duration driver, as well as a modulator, input which is connected to the shaper of duration, and the output to the switch, the output of the first one-shot connected to the inputs of the switch and the first memory circuit, the output of the threshold device connected to the inputs of the first and second circuits RAM memory detection circuit output is connected to inputs of the threshold device and the first memory circuit and a second output connected to the oscillator input of the frequency divider. FIG. 1>