SU865300A1 - Electrostimulator - Google Patents

Description

(54) ELECTROSTIMULATOR

one

This invention relates to the field of medicine, namely to electrostimulators.

Electrostimulators are known, which contain a power source and a generator connected in series, a driver of stimulating pulses, an output stage, a measuring circuit, and electrodes 1.

A disadvantage of such devices is the need to adjust them during the stimulation process in order to reduce pain under the electrodes.

The purpose of the invention is to reduce pain under the electrodes.

This goal is achieved by the fact that a device containing a power source and a series-connected generator, a driver of stimulating pulses, an output stage, a measuring circuit and electrodes are additionally introduced a differentiating circuit and a threshold device connected to each other, and the input of the differentiating circuit is connected to the output of the measuring circuit and the output of the threshold device is connected to the control input of the driver of stimulating pulses.

FIG. 1 shows the scheme of the proposed electro-stimulator; in fig. 2 - timing diagrams explaining the operation of the device, where U | - voltage from the generator output. Us is the voltage from the output of the driver of stimulating pulses, US is the voltage from the output of the measuring circuit, proportional to the stimulating current, and is the voltage from the output of the differentiating circuit. Us is the voltage from the output of the threshold device.

The electrostimulator contains a generator 1,

10 shaper 2 stimulating pulses, an output stage 3, a measuring circuit 4, a differentiating circuit 5, a threshold device 6, a power source 7 and electrodes 8.

The proposed electro-stimulator works as follows.

The generator 1, with the first clock pulse, starts the shaper 2 of stimulating pulses, at the output of which a voltage difference of a rectangular shape is formed, coming through the output stage 3 and

20 measuring circuit 4 on the electrodes 8, mounted on the patient's body. A voltage proportional to the current flowing through the patient and having the form of an exponent decreasing to a certain level is removed from the output of the measuring circuit 4. After the differentiation of a given voltage by the differentiating circuit 5, the voltage at its output has the form of an exponent.

This voltage goes to the threshold device 6, which produces a short pulse, the beginning of which coincides with the moment the output voltage of the differentiating circuit 5 decreases to a certain level, the pulse from the output of the threshold device 6 goes to the control input of the driver 2 for stimulating pulses, dropping it until the next clock pulse arrives.

When generating subsequent clock pulses, the operation of the circuit is repeated. A change in the duration of the transient process in tissues causes a corresponding change in the moment of the appearance of a pulse at the output of the threshold device 6, which leads to a corresponding change in the duration of the stimulating pulses.

The use of the proposed electro-stimulator makes it possible to eliminate its periodic adjustment and reduce the painful sensations under the electrodes in the process of anti-pain stimulation.

Claims (1)

5 Formula of Invention An electrostimulator containing a power source and a series-connected generator, a driver of stimulating pulses, an output stage, an O measuring circuit and electrodes, characterized in that, in order to reduce pain under the electrodes, a differentiating circuit and a threshold device are added to it , while the input of the differentiating circuit is connected to the output of the measuring circuit, and the output of the threshold device is connected to the control input of the driver of stimulating pulses. 20 Sources of information taken into account during the examination 1. USSR Copyright Certificate No. 491389, cl. A 61 N 1/36, 1976.