RU2020981C1 - Electrostimulator - Google Patents

Abstract

FIELD: medicine. SUBSTANCE: device permits to generate electric signals in frequency bend 20-20000 Hz, which have to be multifrequency combinations of discrete components frequency-modulated sequences. Device has generators 1-3 with frequencies which change during period of time, frequency modulators 4, 8, 12, commutators 5, 9, 13, pseudorandom pulse generators 7, 11, 15 and master oscillators 6, 10, 14. EFFECT: improved efficiency of treatment. 2 cl, 4 dwg

Description

 The invention relates to technical means used in medical practice, and can be used for rehabilitation treatment and targeted training of neuromuscular structures, stimulation of various organs, restoration of skeletal structure disorders.

 The aim of the invention is to increase the effectiveness of treatment by reducing adaptation.

 In FIG. 1 shows a block diagram of a device; figure 2, 3 and 4 are timing diagrams of voltages at the outputs of individual elements of the structural diagram.

 A device for multi-frequency electrical stimulation of neuromuscular structures and organs contains generators with time-varying frequencies 1, 2 and 3, and generators with time-varying frequencies include frequency modulators 4, 8 and 12, switches 5, 9 and 13, pseudo-random pulse generators 7 , 11 and 15, specifying the generators 6, 10 and 14.

 The device also includes a mixer 16, an amplifier of stimulating signals 17, a current meter (milliammeter) 18, a control panel 19, and electrodes that attach to the patient's stimulated structures (“patient”) (see FIG. 1).

 In this case, the inputs of the mixer are connected to the first outputs of the generators with time-varying frequencies, and its output is connected to the first input of the amplifier. The output of the amplifier is connected through a current meter to the electrodes, the second input of the amplifier is connected to the first output of the control panel, the other outputs of the control panel are connected to one input of the generators with time-varying frequencies, the third outputs of the control panel are connected to other inputs of the generators with time-varying frequencies. The second output of each of the oscillators with a time-varying frequency is connected to the third input of the remaining generators with a variable frequency.

 Each of the generators with time-varying frequencies contains a series-connected frequency modulator, a switch that sets the generator, the output of which is the output of a generator with a time-varying frequency, a pseudo-random pulse generator, the output of which is connected to one input of the switch, and the input is one input of a generator with a variable in time frequency, the other inputs of the switch are the third inputs of the generator with a time-varying frequency, the output of the frequency modulator is the second generator output with a time-varying frequency.

The device operates as follows. Frequency modulator 4 (Fig. 1) generates a sawtooth voltage U ₁ (see Fig. 2), the period T _hm1 , which is set from the control panel 19 by changing the parameters of the timing RC-chain of the frequency modulator 4.

Frequency modulator 8 generates a sawtooth voltage U ₃ (see Fig. 3), the period T _{hm3 of} which is also set from the control panel 19 by changing the parameters of the timing RC circuit of the modulator 8.

The frequency modulator 12 generates a triangular voltage U ₅ , the period of T _hm3 which is set in the same way from the control panel 19 (see Fig. 1).

Frequency modulators 4, 8 and 12 are made in such a way that from the control panel 19 for each of them can be set its own type of law of change of the output voltage U ₁ , or U ₃ , or U ₅ (figure 2).

The output voltage U _{1 of the} frequency modulator 4 (see figure 2), the output voltage U _{3 of the} frequency modulator 8 and the output voltage U _{5 of the} frequency modulator 12 are supplied to the corresponding switched inputs of the switches 5, 9 and 13.

Pseudorandom pulse generators 7, 11 and 15 contain clock generators in which voltages U ₇ , U ₁₀ and U ₁₃ are generated (Fig. 13), respectively.

The follow-up periods of these voltages τ ₁ , τ ₂ and τ ₃ (the follow-up periods of clock pulses) are set from the control panel 19 and are equal to or a multiple of the values from the interval
τ = (0.01 ÷ -1) c
These clock pulses are used in the formation of pseudo-random sequences of rectangular pulses U ₈ , U ₁₁ and U ₁₄ (see Fig. 3) at the output of the pseudo-random pulse generators 7, 11 and 15 (see Fig. 1), respectively. The output voltages U ₈ , U ₁₁ and U _{14 of the} pseudo-random pulse generators 7, 11 and 15 are supplied to the control inputs of the switches 5, 9 and 13 (see figure 1).

Switches 5, 9 and 13 at each transition of the corresponding voltages U ₈ , U ₁₁ and U ₁₄ from low to high and vice versa (at each transition from "0" to "1" and vice versa) make serial connection of the outputs of the frequency modulators 4, 8 and 12 to the inputs of the master oscillators 6, 10 and 14 in the selected order. In this example, the sequence of connecting the outputs of the frequency modulators to the input of the master oscillator 6 is selected as: 4, 8, 12, 4, 8, 12, 4, 8, 12, etc .; to the input of the generator 10 is selected in the form of 8, 4, 12, 8, 4, 12, 8, 4, 12, etc .; to the input of the generator 14 - in the form of 12, 4, 8, 12, 4, 8, 12, 4, 8, etc.

 The master oscillators 6, 10 and 14 are voltage-frequency analog-to-digital converters.

The output voltage U ₂ (see FIG. 2) of the master oscillator 6 when modulated only by the frequency modulator 4 has the form of a “meander” type of increasing frequency F ₁ (decreasing period T ₁ ), with F ₁ = 1 / T ₁ (see FIG. .2).

The output voltage of the generator 6 when it is modulated only by the frequency modulator 8 has the form of a "meander" U _{4 of the} incident frequency F ₂ (increasing period T ₂ ), and F ₂ = 1 / T ₂ (see figure 2), and when modulated only by the frequency modulator 12 - has the form of a "meander" U _{6 of} increasing-decreasing frequency F ₃ (decreasing-increasing period T ₃ ), with F ₃ = 1 / T ₃ (see figure 2).

Adjusting the periods T _hm1 , T _hm2 and T _hm3 (see _figure 2) of the output voltages of the frequency modulators 4, 8 and 12 from the control panel 19 (see figure 1) provides a change in the values of the frequencies F ₁ , F ₂ and F ₃ output voltages of the master oscillators 6, 10 and 14 and their change rates dF ₁ / dt, dF ₂ / dt and dF ₃ / dt within the limits of:
F _i = (20 ÷ 20,000) Hz
dF _i / dt = ± (5 ÷ 200) ˙ 10 ³ Hz / s, where i = 1, 2, 3.

As a result of the serial connection of the frequency modulators 4, 8 and 12 to the inputs of the master oscillators 6, 10 and 14, carried out by the switches 5, 9 and 13 in this order, the output voltage U ₉ is formed at the output of the generator 6 (see Fig. 3); the voltage U ₁₂ is formed at the output of the master oscillator 10, and the voltage U ₁₅ is formed at the output of the master oscillator 14 (see Fig. 3).

Each of these voltages U ₉ , U ₁₂ and U ₁₅ is a discrete composite frequency-modulated signal.

The output voltages U ₉ , U ₁₂ and U _{15 of the} master oscillators 6, 10 and 14 are supplied to the inputs of the mixer 16 (see figure 1), which is a summing pre-amplifier of low frequency.

As a result of summing the output voltages U ₉ , U ₁₂ and U ₁₅ (Fig. 4) of the driving oscillators 6, 10 and 14 (see Fig. 1), a voltage U ₁₆ (see Fig. 4) is formed at the output of the mixer 16. a linear combination of these voltages is a linear combination of discrete composite frequency-modulated signals. At the same time, the spectrum of the output signal of the mixer 16 at each particular moment in time will have three spectral components that “move” during the stimulation in the same frequency range from 20 to 20,000 Hz.

Thus, changing from the control panel 19 repetition periods τ ₁ , τ ₂ and τ ₃ clock pulses of pseudo-random pulse generators 7, 11 and 15, setting from the control panel 19 types and parameters of the laws of linear frequency modulation for frequency modulators 4, 8 and 12 provide for each discrete output signals of the master oscillators 6, 10 and 14, the values of the initial frequency fo and the rate of change df / dt of the signal frequency in the discrete, varying in the following limits:
f _o = (20 ÷ 20,000) Hz;
df / dt = ± (5 ÷ 200) ˙10 ³ Hz / s, and the durations Δt _1i , Δt _2j and Δt _3k (see Fig. 3) of signal samples equal to or multiple of Δt values from the interval
Δt = (0.01 ÷ 1) s. The output signal of the mixer 16 is fed to the input of the amplifier of stimulating signals 17 (see Fig. 1), where, after amplification in amplitude, it is sequentially fed through the current meter 18 to the patient for electrical stimulation.

 From the control panel 19, the amplitude level of the output signal of the amplifier 17 is selected, determined by the individual characteristics of the stimulated structures.

Claims (2)

 1. ELECTRICAL STIMULATOR containing time-varying frequency generators, an amplifier and electrodes, characterized in that, in order to increase the effectiveness of treatment by reducing adaptation, a control panel, a current meter and a mixer are introduced into it, the inputs of which are connected to the first outputs of the generators with variable in time with frequencies, and the output is connected to the first input of the amplifier, the output of which is connected through a current meter to the electrodes, the second input of the amplifier is connected to the first output of the control panel, the other outputs of which o are connected to one of the inputs of the generators with time-varying frequencies, and the third outputs are connected to the other inputs of the generators with time-varying frequencies, the second output of each of the generators with a time-varying frequency is connected to the third input of the other generators with a varying frequency.  2. The pacemaker according to claim 1, characterized in that each of the time-varying frequency generators comprises a series-connected frequency modulator, a switch that sets a generator whose output is the output of a time-varying frequency generator, a pseudo-random pulse generator, the output of which is connected to one input of the switch, and the input is one input of the generator with a time-varying frequency, the other inputs of the switch are the third inputs of the generator with a time-varying frequency , the output of the frequency modulator is the second output of the generator with a time-varying frequency.

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