Device for finding acupuncture points. Scheme, description

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Device for finding acupuncture points. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Medicine

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On the surface of the human body there are a large number of so-called biologically active points. By influencing these points with a needle, massage, heating, electric current, ultrasound, laser beam, many diseases are treated. These points can be used for anesthesia and diagnosis. Particular attention is paid to points on the surface of the auricle, which are used for diagnosis and treatment (auricular diagnosis). On the auricle of a healthy person, areas with increased electrical conductivity are not found. However, when certain organs are diseased, electrically conductive points up to 1 mm in diameter appear at various points in the auricle corresponding to these organs.

This property of auricular points allows them to be used in the diagnosis of certain diseases long before signs of malaise become obvious. Acupuncture or electropuncture impact on these points should be carried out only on the recommendation and under the supervision of a physician. Biologically active points are located in strictly defined places on the skin. The number of such points on human skin is quite large (over 700), which makes it difficult to find them. In the manuals for reflexology, the location of such points is described. However, these points can be accurately found only with a device that allows you to determine the increased electrical conductivity of some areas of the skin.

The scheme of the device for searching for acupuncture points is shown in the figure.

(click to enlarge)

The circuit contains a comparator implemented on an operational amplifier (op-amp) K140UD7, an electronic key on a transistor V1 type KT349B and a sound generator on transistors V2 type KT349B V3 and U4 type K.T315V. Electroskin resistance is measured between points A and B. The passive electrode connected to point A is a hollow aluminum cylinder 20 mm in diameter and 85 mm long. The active probe, electrically connected to point B, is designed as a pen with a pointed metal tip. When working with the device, the passive electrode is held in the hand, and the active one is looking for the corresponding point.

The skin resistance and resistor R1 form a voltage divider to which the non-inverting input of the operational amplifier is connected. A reference voltage is supplied to the inverting input from a voltage divider across resistors R3, R4 and potentiometer R. If the voltage at point A becomes greater than at the inverting input, then the output voltage of the operational amplifier (about 9 V) transistor V1 is closed. When the voltage at point A is lower than the voltage at the inverting input, the transistor V1 opens and the supply voltage is applied to the sound generator, made on transistors V2-V4.

When working with the device, the patient holds the passive electrode with one hand. The place on the skin where the active point is searched is wiped with alcohol. The active electrode is applied to the place where it is supposed to search for the active point. The R potentiometer setting knob is set to a position where the sound indication is turned on when the probe is connected to the active, lowest resistance point, and there is no alarm outside the active point.

It is necessary to work with the device quickly, since even insignificant currents flowing through the skin and subcutaneous tissues change the skin resistance. The touch of the searching electrode to the skin should be with the same force. These two conditions, together with the selection of the sensitivity of the device, to a large extent determine the success of the search for biologically active points.

With direct current, the resistance of the skin at different points is different and can vary from hundreds of kilo-ohms to units of mega-ohms. Therefore, to change the sensitivity of the device, it provides the ability to connect resistor R1 using the key S2. The device is powered by a 9V battery and consumes a current of about 5 mA.

The circuit can be simplified by using LED indication. The LED is connected through a 470 ohm resistor between the output of the op amp and a 9V voltage source. In this case, the transistor V1 and the buzzer may not be present. However, light indication may be less convenient than sound indication.

Author: M.Tsakov

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