SU1621950A1 - Electrostimulator - Google Patents

Abstract

The invention relates to medical instrumentation, in particular, to pulse electro-stimulators, and is intended for use in physiotherapeutic practice. The purpose of the invention is to reduce pain and adaptation effects during electrical stimulation. The electrostimulator contains a power supply bus 1, to which an amplitude regulator 2 and a controlled generator 3 are connected in parallel, as well as an envelope generator 5 and a series-connected power amplifier 6 and a transformer 7, whose secondary windings are connected to electrodes 8. A new one is that block 4 is initial reset, and control generator 3 is three-input, with the first output of block 4 of initial reset connected to the amplitude controller 2 and the first input of controlled generator 3. second output of block 4 the initial reset is connected to the input of the envelope generator 5, the outputs of which are connected to the second and third inputs of the controlled generator 3, the output of which is connected to the power amplifier 6. 2 hp f-ly, 6 ill. with

Description

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The invention relates to medical instrumentation, in particular, to pulse electro-stimulators, and is intended, for example, for mass use in physiotherapy practice, sports, at home, traveling with limited mobility of a stimulated object, for rehabilitation treatment and neuromuscular training. apparatus.

The aim of the invention is to reduce pain and adaptation effects during electrical stimulation.

FIG. 1 shows a functional diagram of the electrostimulator; in fig. 2 - time diagrams of work; Fig, 3 is a block diagram of the initial reset; in fig. 4 - time diagrams of the unit; in fig. 5 is a generator control circuit; in fig. 6- timing diagrams of the generator.

The electrostimulator contains a power supply bus 1, to which the 2 amplitude controller and the controlled generator 3 are connected. To the output of the 2 amplitude controller, the initial reset unit 4 is connected by the first input. An envelope generator 5 is connected to the second output of block 4. The outputs of the envelope generator 5 are combined with the second and third inputs of the generator 5, and the first input of the latter is connected to the first output of block 4. The output of the generator 5 is connected in series with a power amplifier 6 and a transformer 7, to the secondary winding of which electrodes 8 are connected.

Block 4 initial reset contains the first element 9, the input of which through the capacitor 10 is connected to the bus of zero potential and through the first resistor 11 to the first output of block 4 of the initial reset. The output element NO 9 is connected by an emitter transistor 12, to the collector of which the input is connected to the second element NOT 13. The last input through the second resistor 14 is connected to the zero potential bus, and its output is connected to the first output of block 4, the base of the transistor 12 through the third resistor 15 is connected k / second output unit 4.

The controlled oscillator 3 contains the first one-shot 16, to the inverse output of which the second one-shot 17 is connected by a first input, and the direct output of the one-shot 16 is the output of the generator 3. The inverse output of the one-shot 17 is connected to the first input of the one-shot 16 and each of the two inputs of the generator 3 are connected in parallel two elements consisting of in series

connected diodes 18 and 19 and resistors 20 and 21, and between the second input of the one-shot 17 and the third input of the generator 3 is connected an element consisting of a series-connected diode 22 and a resistor 23. Between the bus 1 and the zero potential bus two elements are connected in parallel, each which consists of series-connected resistors 24 and 25 and capacitors 26 and 27. The connection point of resistor 24 and capacitor 26 is connected to the second input of one-shot 16, and the connection point of resistor 25 and capacitor 27 is connected to the second entrance of one-shot ra 17.

The electrostimulator operates as follows.

When the electrostimulator is turned on and any position of the amplitude regulator 2 is different from the initial one, the initial reset unit 4 generates at output b a signal prohibiting the switching on of the envelope generator 5. Generator 5 is started when the initial position of the amplitude regulator 2 is set. From the antiphase outputs of the Vig generator 5, trapezoidal voltage is removed (UeB diagram, Fig. 2). The voltage taken from the output of the envelope generator 5 controls the pulse duration of the generator 3, and the voltage taken from the output of g controls the frequency of the generator 3. As a result, a sequence of frequency-modulated pulses Us of varying duration is formed at the output of generator 3 the form of the voltage at its inputs.

The pulses Us taken from the output of the generator 3 are fed to the power amplifier 6, the load of which is the transformer 7. Such switching on allows you to directly convert the value of the duration of the pulses Us into the corresponding amplitude of the stimulating pulses Us without introducing an additional amplitude adjuster. This is due to the fact that the amplitude of the current pulses taken from the secondary winding of the transformer increases with an increase in the duration of the voltage pulses applied to its primary winding. The current pulses removed from the secondary winding of the transformer 7 excite the electrodes 8, with the stimulating signal being modulated in frequency and amplitude.

Block 4 initial reset works as follows. When the power source Urwr is turned on (on voltage + E to bus 1), capacitor 10 is discharged, as a result of which the output of element HE 9 sets the level of the logical unit (voltage + E, Fig. 4). If the amplitude regulator 3 (for which you can use, for example, a variable resistor connected between bus 1 and ground) is in an arbitrary, but not zero, position (Ite diagram), then transistor 12 is open by the voltage Uper and the output of the element is NOT 13 sets the logic level O and 13, which is the output signal of block 4. The zero voltage value U13 prohibits the operation of the envelope generator 5. Setting the amplitude controller 2 to the zero position leads to the closing of the transistor 12 and the appearance at the output of the element HE 13 of a logical level of 1 m. At the output of the element 9, this sets the logic level O, which closes the transistor 12. Further adjustment of the amplitude of the regulator 2 does not change the closed state of the transistor.

The generator 3 frequency is controlled by changing the charge current of the capacitor 27 when the signal Usr arrives, and the generator 3 pulse duration is controlled by changing the charge current of the capacitor 26 when the signal Us arrives (diagrams U26, U27, Fig. 6). At the same time, the signal U4a, taken from the amplitude regulator 2, controls the duration of the output pulses of the generator 3, i.e. regulation of the amplitude of stimulating pulses. Resistors 20, 21, and 23 and diodes 18, 19, and 22 eliminate the influence of the input of one-shot 16 and 17 (capacitor discharge circuits 26 and 27) on the outputs of the envelope generator 5 and the amplitude regulator 2.

When the power source is turned on, the zero output of one of the one-shot (for example, one-shot 16) is set to logic level 1. Then a positive one-shot, for example, 17, starts the pulse, the duration of which is determined by the constant charging time of the capacitor 27. By the end of the pulse Ui7 with a positive front, the one-shot 16 is restarted, forming a pulse, the duration of which is determined by the constant charge time of the capacitor 26. As a result, the single-switches 16 and 17 alternately start one another and form a modulated output sequence ys (Fig. 2).

Claims (3)

1. An electrostimulator containing an amplitude controller and a controlled generator connected to the power supply bus, as well as an envelope generator and a series-connected power amplifier and a transformer, to the secondary winding of which electrodes are connected. In order to reduce pain and adaptation effects during electrostimulation, an initial reset unit was inserted into it, and the controlled generator was made three-input; this is the first the output of the initial reset unit is connected to the input of the amplitude regulator and the first input of the controlled generator, the second output of the initial reset unit is connected to the input of the envelope generator, the outputs which are connected respectively to the second and third inputs of the controlled oscillator, the output of which is connected to the power amplifier. 2. Elektrotimulor pop. 1, with the fact that two NOT elements, a transistor, a capacitor and three resistors are introduced into the initial reset unit, while the input of the first element is NOT connected in parallel through a capacitor to the potential-free bus and through the first resistor to the output of the second element is NOT and the first output of the initial reset unit, and the output of the first element is NOT connected to the emitter transistor, the input of the second element is NOT connected in parallel through the second resistor to the zero potential bus and to the collector of the transistor, the base of which is connected to the second through the third resistor exit block initial reset. 3. Electrostimulator according to claim. 2, in which two single vibrators, two elements of a series-connected resistor and a capacitor, and three elements of a series-connected resistor and a diode are inserted into the controlled generator, while the inverse output of the first one-vibrator is connected to the first input the second one-shot and the inverse output of the second one-shot are connected to the first input of the first one-shot, the direct output of which is connected to the output of the controlled generator, the second inputs of the one-shot are connected to the corresponding points of connection of the resistor and capacitor of the elements of the series-connected resistor and capacitor, other terminals of these resistors connected to the power bus, and the other terminals of these capacitors are connected to the zero potential bus, between each of the two inputs of the controlled generator and a second input of the first monostable respectively connected first and second members of the series-connected resistors and novibrator are connected to the third element from the diode, and between the third input of the control and the series-connected resistor and th generator and the second input of the second one diode. 3 ppppppppp and eight FIG. 2 fig.Z FIG. f U,  26 % % P i papptg Pshsh u papptg