A simple electroacupuncture stimulator. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Electronics in medicine

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The scheme of one of the stimulators is shown in fig. 1. Its main parts are a 564 or K176 series microcircuit, an HL1 LED indicator and a VT1 transistor, on which a matching (buffer) cascade is made. In addition, the stimulator is equipped with probes X1 and X2, of which X1 is considered active - they are driven along the body and the desired point is found, and X2 is passive, attached, for example, to the arm.

On elements DD1.1, DD1.4, a determinant of biologically active points (BAP) is assembled, and on DD1.2, DD1.3 - a generator of stimulating pulses. When the probe X1 hits the active point, the resistance of the human body in this place drops sharply, as a result of which at the input of the element DD1.1, and hence at the output of DD1.4, almost a logical level 0 appears. The HL1 LED lights up on the found point.

Simultaneously appearing at the output of the element DD1.1 logic level 1 allows the operation of the generator. The pulses generated by it pass through the matching cascade and are fed to the active probe X1, and through it to the patient's body. Diode VD1 prevents the passage of pulses to the input of the element DD1.1 and at the same time in the pauses between pulses allows you to save the BAT search mode. Thus, there is no need for a button, which is typical for such stimulators and switches the probes from the point search mode to the stimulation mode.

Variable resistor R1 sets the threshold for automatic operation individually for each patient, resistors R4 and R5 - the repetition rate and duration of stimulating pulses, and resistor R9 - their amplitude.

Details of the device can be placed in a small metal case, which simultaneously serves as a passive probe. For the manufacture of an active probe, a used ballpoint pen is suitable, a wire is soldered to the writing unit of which, and a drug is poured into the case, if necessary - then the stimulation procedure will be combined with electrophoresis (a therapeutic method of influencing the body with direct current and medicinal substances introduced with its help through the skin or mucous membranes).

If, in addition to the light, an audible indication of the BAP search is also needed, the stimulator should be modified, as shown in Fig. 2. The cascade on the transistor VT2 together with the cascade on the DD1.4 element form an RF generator, the signal of which is converted into sound by a piezoelectric emitter BF1.

It should be noted that in the stimulator pulse generator, when the frequency is adjusted, the pulse duration changes slightly, and when the duration is adjusted, the frequency.

On fig. 3 shows another scheme of the stimulator, in which the pulse generator is designed differently, which made it possible to avoid the mutual influence of the frequency and duration of the pulses. In addition, the generator is powered by elements DD1.1 - DD1.3 from element DD2.1.

The generator of light and sound signals, made on the elements DD2.3, DD2.4, is modulated by the signal of the stimulating pulse generator - this allows you to visually and aurally control the frequency of stimulating pulses.

With the values ​​of the elements indicated on the diagrams of the stimulators, the pulse frequency can be changed by a variable resistor from 10 to 150 Hz, and the duration from 0,5 to 5 ms.

Attention! Use the device after consulting a doctor!

Author: A. Boroday; Publication: cxem.net

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