SU577040A1 - Apparatus for low-frequency therapy - Google Patents

Description

one

The invention is flawed in the field of medicine, namely in medical technology, and can be used in the treatment of various diseases accompanied by impaired peripheral circulation, functions are not | muscular system, tissue trophism, chronic inflammatory processes and vegetative-vascular disorders.

A device for low frequency therapy is known comprising an infra-low frequency generator, an amplitude modulator, an audio frequency generator, and a power amplifier l. However, the known device causes the body to adapt.

The purpose of the invention is to reduce the adaptive effects of the body by forcibly contracting and relaxing the D1 muscles with varying temporal relationships between the contraction phases.

For this, the device has a pulse width. 1 pulse modulator and a release circuit, with the trigger circuit, pulse width modulator, amplitude modulator, and power amplifier connected in series. Input trigger circuit is connected

 with the output of the pulse-width modulator, and the generators of the infra-low and sound frequencies with (dinene with the second inputs of pulse-amplitude and amplitude modulators.

On fi1-. 1 shows a functional setup for low-frequency therapy; in fig. 2 - time - pulse diagram (device operation.

The device contains a release circuit 1, a bus JOtn-and an electric modulator 2, a generator 3 of an infra-low frequency, an amplitude modulator 4, a generator 5 of sound frequency and an amplifier 6 of power.

The output of the pulse-width modulator 2 is connected to the input of the triggering circuit 1, which is fed to the input of the pulse-width modulator. The trigger circuit is a one-shot triggered from the falling edge of the pulse-width modulator 2, which in turn is triggered from the falling edge of the one-shot. Thus, when a single start is run once in this closed system, the generation of pulses occurs.

The second input of the pulse-width modulator 2 receives signals from the generator of infra-low 3 frequencies, which modulates the pulse duration of the modulator 2. The signals generated by the generator of infra-low frequencies 3 can be sinusoidal, triangular or trapezoidal. Here it is important to have a monotonous increase and decrease in the amplitude of the signal, which leads to a MUCHSHE extension and shortening of the pulse duration of the pulse-width modulator 2.

The pulse from the output of the modulator 2 is fed to one input of the amplitude modulator 4, to the other input of which signals from the output of the 5 audio frequency generator are received. Thus, at the output of the amplitude modulator 4, a burst of sinusoidal audio frequency oscillations is pulsed, the burst duration being modulated by an infra-low frequency. The signals from the output of the amplitude modulator 4 are fed to the input of the amplifier 6 power, the output of which is fed to the patient.

The frequency of the infra-low frequency generator is adjustable from O, O1 Hz to 10 Hz. The duration of the trigger circuit is adjustable from 5 seconds to 0.5 seconds. It is also possible to smoothly adjust the minimum duration and depth of modulation of the pulse width modulator. The power amplifier has the ability to adjust the amplitude and cut off one of the polarities.

When using the proposed device, due to the smooth change in the duration of the pulses, a new physiotherapeutic effect is obtained, a reduction in side effects is achieved and an effective effect on the organism is achieved, and the adaptation effect is minimized.

Claims (1)

Invention Formula A device for low-frequency therapy, comprising an infra-low frequency generator, an amplitude modulator, an audio frequency generator, and a power amplifier, so that, in order to reduce the adaptive effects of the body by forcibly contracting and relaxing muscles at varying temporal ratios x between the phases of contraction, it has a pulse width modulator and a trigger circuit, the trigger circuit, a width modulator, amplitude (the modulator and the power amplifier are connected in series, input . Launcher convergence we connected to the output ishrotno-width modulator, and n; eratory infra11izkoy and-sound frequency are connected to second inputs schirotno-impulsaogo and amplitude modulators. Sources of insight taken into account during the examination: L. 71Iventsova I.L., and Livensson A, b. Electromedical apparatus, M., Medicine, 1974, p. 128-133. Uz }