RU2098919C1 - Pulse burst shaping process - Google Patents

Abstract

FIELD: pulse technique; medical electronic apparatuses, such as muscle electrostimulators. SUBSTANCE: process involves supply of trigger pulses and clock pulses, delay of pulse train being shaped relative to trigger pulse rise times, shaping of rectangular pulse trans of desired repetition rate, burst length, output pulse amplitude control; delay of pulse train being shaped relative to trigger pulse rise times is adjusted between 0 and 0.1 s; pulse repetition rate is adjusted between 40 and 80 Hz, pulse burst length, between 50 and 1250 ms, output pulse amplitude, between 0 and 105 V by means of resistive dividers incorporating variable resistors; specified length of single pulse is fixed value. EFFECT: facilitated shaping of pulse bursts. 4 dwg

Description

 The invention relates to a pulse technique and can be used to form bursts of pulses, for example, in medical electronic devices - muscle stimulators.

 The invention is aimed at solving the problems of creating the prerequisites for developing the correct motor stereotype by improving coordination ratios of muscle activation, artificially controlling movements of various difficulty levels, reducing reflex muscle tone in the treatment of patients with systemic muscle tone disorders (cerebral palsy), as well as when changing operating conditions tendon and muscle receptors.

A known method of forming a burst of pulses in which the duration of the stimulating effect is determined by the delay units (delay time of 0.4-7.5 s). The clock pulse generator (GTI) is started by a signal from the output of the OR element and generates a sequence of rectangular pulses with a frequency of 100 ± 30 Hz. From the output of the clock generator, the pulses are fed to a symmetric trigger, which divides their frequency in a ratio of 1: 2. At the same time, pulses from the GTI output are fed to stimulating pulse shapers (PSI) of two channels. FSI determines the duration of stimulation pulses. Pulse sequences from the outputs of the pulse train former (FPI) of both channels, the symmetric trigger, and the FSI of both channels are fed to the inputs of the three-input circuits and each channel. At the outputs of the elements, complete stimulating pulses of both channels are formed. These pulses enter the output stages of the channels, where the power is amplified and the amplitude is adjusted. From the outputs of the channels, the pulses are fed to the primary windings of the output transformer, from the secondary winding of which phase splitting (separation) of pulses of different polarity through the channels occurs [1]
A known method of forming a packet of pulses ("Corrector of movements" KORD-1 "" Prosthetics and prosthetics ", issue 65, 1983 130-137, Central Research Institute of Applied Scientific Research).

 In the known method, electrical stimulation of the muscles is carried out with a series of unipolar electrical impulses. A series of impulses are synchronized when walking with movements in the knee or hip joint and are formed periodically when training the muscles at rest. The duration of stimulating pulses is regulated within 20 200 μs, the duration of muscle excitation within 0.2 2.0 s, the duration of muscle relaxation within 0.4 - 7.5 s, the delay in the start of stimulation in the "correction" mode after the synchronization sensor is triggered in within 0.09 s. Individually selected frequency parameters of stimulating pulses in the range of 40 to 400 Hz.

 A known method of forming a packet of pulses ("Orthopedic apparatus with an electronic control system" "Prosthetics and prosthetics." M. TsNIIPP, issue 80, p. 123 127).

 In the known method as an informative parameter, the flexion angle of the joint extension is used. The delay time of the stimulating signal is regulated relative to the moment the synchronization sensor is triggered (information parameter), the duration of the output pulse train, the pulse repetition rate, the voltage amplitude of the stimulating signal.

To solve the problems in the proposed method of forming bursts of pulses carry out the following operations:
regulation of the delay in the formation of bursts of pulses relative to the start pulse within 0 1.0 s;
setting the pulse repetition rate in a packet within 40–80 Hz;
regulation of the total duration of the pulse train within 50 1250 ms;
regulation of the amplitude of the output pulses in the range from 0 to 105 V;
setting a fixed duration of a single pulse.

 Figure 1 shows a block diagram of a device for implementing the method; figure 2 timing diagrams of the operation of the device for implementing the method; figure 3 is a schematic diagram of a device for implementing the method; figure 4 is a real waveform of a single pulse of the proposed method (solid line) and the prototype method (dashed line. On the coincidence plot of the waveform of the proposed method and the prototype method, the dashed line for convenience is shown next to the solid line).

 In FIG. 1 shows the input 1 of the external synchronization sensor, the generator 2 infra-low-frequency (GINCH) oscillations, channels I and II, each of which contains a 3-phase regulator, one-shot 4, modulator 5, amplifier-shaper 6, output 7 of the 1st channel, output 8 ll channel. In addition, figure 1 shows the display unit 9 and the clock generator 10 (in this case, a low frequency generator).

 Input 1 is intended for receiving a signal from an external stimulation synchronization sensor in the "correction" mode.

 GINCH 2 is designed to form muscle stimulation commands in the "training" mode.

 Figure 3 shows GINCH 2, which includes the elements HE 11, HE 12, resistor 13, resistor 14, capacitor 15.

 GTI 10, which includes elements HE 16, HE 17, resistors 18, 19, 20, capacitor 21.

 Channel I (II), which includes a 3-phase controller, a single-shot 4, a modulator 5, an amplifier-shaper 6.

 The phase 3 controller contains a D-trigger 22 (23), a resistor 24 (25), a capacitor 26 (27).

 The one-shot 4 contains a D-flip-flop 28 (29), a resistor 30 (31), a capacitor 32 (33), a diode 34 (35).

 The amplifier-driver 6 contains a capacitor 36 (37), a resistor 38 (39), a resistor 40 (41), a transistor 42 (43), a transformer 44 (45), a resistor 46 (48), a resistor 47 (49), a diode 50 ( 51).

 Modulator 5 contains element HE 52 (53), resistor 54 (55).

 The display unit 9 comprises a resistor 56, a resistor 57, a transistor switch 58, a resistor 59, an LED 60.

 Figure 3 also shows the storage capacitor 61, the resistor 62, points 63 and 64 connecting the power source, connectors 65-67, switch K2: Contacts "5" and "6" of connector 66 (signal "SIN") are used to connect an external sensor sync to input 1.

 The device operates as follows.

 Depending on the position of the K1 switch, the input signal of channels I and II is either a signal from an external synchronization sensor (“correction” mode) or rectangular pulses from GINCH 2 (training mode) that are continuously following with a frequency of 0.3 Hz. The input signal in the "correction" mode is synchronized with the movements of the joint.

 The negative edge of the input signal switches the C-input of the D-flip-flop 22 (23) of the 3-phase controller to a low logic level, initiating the start of a single-vibrator 4 adjustable within 0 1 s of the time delay and, accordingly, the beginning of the formation of a stimulating pulse train. After this time delay, the phase 3 controller starts the one-shot 4, which sets the duration of the output pulse train. Resistor 30 (31) can be adjusted within 50 1250 ms. From the output of the one-shot 4, the pulse is fed to the first input of the modulator 5, the second input of which is constantly fed with clock pulses from the GTI 10 with a frequency set in the range from 40 to 80 Hz. When adjusting the total duration of the burst cut out by the modulator 5, the clock pulses within 50 1250 ms the number of individual clock pulses in it can, therefore, be from 2 to 100.

 The packet of clock pulses from the GTI 10, modulated by modulator 5, is fed to the input of the driver-amplifier 6. The clock pulses of the package along its leading edge open the transistor switch 42 (43), which is available in the amplifier-driver 6, which discharges the storage capacitor 61 through the primary winding of the transformer 44 (45) and thus forms impulses. The transformer 44 (45) of the amplifier-former 6 provides an increase in the voltage of the output pulses and galvanic isolation of the output and control circuits of the device.

 The amplitude adjustment in the range from 0 to 105 V is carried out using resistive dividers 46, 47 (48, 49), included as a load of the secondary winding of the transformer 44 (45).

 The display unit 9 is connected in an OR circuit to both channels. Using the transistor switch 58 for the duration of the generation of the pulse packet in any of the channels, the LED 60 located on the front2 of the device is turned on. The glow of the LED 60 thus indicates the active state of the device.

соответствует входному сигналу "SIN" от внешнего датчика синхронизации в режиме "коррекция". Следующая диаграмма

соответствует входному сигналу каналов, вырабатываемому ГИНЧ 2 (режим "коррекция". Фронт "SYN" показан совпадающим с отрицательным фронтом ГИНЧ 2 условно, для удобства и в режиме "коррекция" приводит к формированию лишь одного из представленных на диаграммах

и

пакетов (в интервалах времени t2 t5), в то время как режим "тренировка" соответствует диаграммам

полностью.Timing diagrams of signals at corresponding points in the block diagram are shown in FIG. 2. The two upper charts are an alternative. First chart

corresponds to the input signal "SIN" from an external synchronization sensor in the "correction" mode. Next chart

corresponds to the input signal of the channels generated by GINCH 2 ("correction" mode. The front "SYN" is shown to coincide with the negative front of GINCH 2 conditionally, for convenience and in the "correction" mode, only one of those shown in the diagrams is formed

and

packets (in time intervals t2 t5), while the "training" mode corresponds to the diagrams

completely.

Claims (1)

 A method of generating bursts of pulses, including supplying triggering pulses, clock pulses, generating pulses delayed relative to the edges of the triggering pulses, generating, based on the delayed pulses and pulses of the clock frequency, bursts of pulses with a given burst duration and a given pulse repetition rate in the burst and subsequent pulse amplitude control in a pack, characterized in that the delay of the formed bursts of pulses is regulated relative to the fronts of the start pulses within 0 1 s, often The pulse repetition in the packet is controlled within 40–80 Hz, the pulse train duration is controlled in the range of 50–1250 ms, the pulse amplitude in the packet is controlled within 0 105 V using resistive voltage dividers with varying resistance, and the duration of a single pulse in the packet is fixed.

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