SU1507405A1 - Electric simulator - Google Patents

Abstract

The invention relates to medicine, namely to electrostimulators. The purpose of the invention is to increase the safety of stimulation by maintaining the same amplitude of electrical stimuli at the end of one pack and the beginning of another pack with an increase in the amplitude of the effect. The electrostimulator contains a master oscillator 1, a coincidence circuit 2, a pulse shaper 3, an amplitude regulator 4, an amplifier 5, an amplitude adjuster 6, a key 7, a delay unit 8, a pulse generator 9. The delay unit 8 comprises a capacitor, a resistor and a diode. During the pause between the bursts of pulses, the key 7 is open and the amplitude does not increase. 1 hp f-ly, 3 ill.

Description

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The invention relates to medicine, namely to electrostimulators.

The purpose of the invention is to increase the safety of stimulation by maintaining the same amplitude; p) 1 electrical stimuli at the end of one pack and at the beginning of another pack with an increase in the amplitude of the effect.

Figure 1 presents the block diagram of the proposed device; Fig. 2 shows the electric circuits of the level setting device, the key, the delay unit and the amplitude controller; FIG. 3 is a time diagram of the process of controlling the amplitude of the output pulses.

The device contains a master oscillator 1, a coincidence circuit 2, a pulse shaper 3, an amplitude regulator 4, an amplifier 5, an amplitude setting device 6, a key 7, a delay unit 8, a pulse generator 9.

Block 8 delay (figure 2) contains a capacitor 10, a resistor 11 and a diode 12

The device works as follows.

The pulses of the required frequency for the physiotherapy procedure from the master oscillator 1 are fed to the first input of the coincidence circuit 2, to the second input of which the nocTynaJOT pulses from the generator output 9 pulses. In coincidence circuit 2, a burst of pulses is formed, the time parameters of which are determined by the time parameters of the strobe. From the output of circuit 2, the pulses arrive at the input of the driver of the 3 pulses, where pulses of the required duration are formed. From its output, the pulse bursts through the amplitude controller 4 and the amplifier 5 arrive at the output of the device. At the moment of switching on the device, when the voltage on the capacitor 10 (Fig. 2) is zero, the transistor 4 of the amplitude regulator is closed and the pulses to the output of the device do not pass at any position of the handle of the amplitude setting device 6. At the moment of occurrence of the strobe allowing the pulse to pass from the master oscillator 1 through the coincidence circuit 2, the key 7 opens and the capacitor 10 begins to charge through the resistor 11 and the key 7. The voltage to

which the capacitor 10 can charge, is determined by the position of the knob of the amplitude adjuster 6. When the voltage across the capacitor 10 reaches a threshold level with respect to the voltage

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The cue at the source of the transistor 4 of the amplitude regulator, its channel begins to open and the pulses through the regulator 4 of the amplitude and the amplifier 5 pass to the output of the device. The amplitude of the passage - ratux pulses is determined by the degree of opening of the transistor channel, i.e. tension on its shutter. The voltage rise rate on the capacitor 10 is determined by the time constant of the charging circuit. At the time of the pause between bursts of pulses, the key 7 is closed and the voltage on the capacitor 10 does not change during the entire pause, regardless of the change in position of the handle of the amplitude setting device 6. When the problem of the amplitude of the pulses at the output of the device decreases, the capacitor 10 is discharged through diode 12 and the amplitude of the pulses follows the task level practically without delay, since the direct resistance of diode 12 is much less than the resistance of resistor 11. The amplitude reset, as well as its increase, occurs only during the passage of a burst.

 Thus, the positive effect from the use of the proposed device lies in the possibility of eliminating the uncontrolled adjustment of the amplitude of the acting pulses during the pause when choosing the optimal mode of action from the conditions of the maximum therapeutic effect with acceptable unpleasant sensations, which increases the safety of electrotherapy.

Claims (1)

1. An electrostimulator containing a master oscillator, an amplitude adjuster and a series-connected delay unit, an amplitude controller and an amplifier, characterized in that, in order to increase the safety of the stimulation by maintaining the same amplitude of the electrostimuli at the end of one pack and at the beginning of another pack, the amplitude of the action, it contains a pulse generator, a key and a series-connected coincidence circuit and a pulse shaper, the output of which is connected to another input of the amplitude controller, and the output The d pulse generator is connected to one of the inputs of the coincidence circuit and Editor L. Veselovska Compiled by B.Popov Tehred M.Hodanich fig.Z Proofreader E. Lonchakova