A sedentary life, illness, and sometimes just laziness, our muscles tend to atrophy. Decreases the blood supply to the muscles and organs. Biologically active points (acupuncture points) lose contact with each other, which leads to disruption of energy exchange between them. It is fraught with new illnesses and deteriorating health. A person dies eyes. Laziness got to get rid of. And for sick people and for people leading a forced a sedentary lifestyle, such as at work, this device. The neurostimulator is not pumping the muscles, as many mistakenly think, after watching advertising and heats them, increasing the blood flow. Especially need such a device to people being a long time in a hospital bed after a car accident, with injuries of the spine, paralyzed. Well and apply it to patients various kinds of arthritis with limited mobility.
Neurostimulator has the following options output pulses:
The output voltage is 100 V.
The duration of the pulse - pp. 1-70
The period of the pulse - 1-110 Hz.
Pulse duration - 50-250 μs.
The parameters of the output pulses are taken on the website of the developer of the industrial device www.bodyshapers.com.
Functional neurostimulator consists of two pulse generators, shaper pulse duration, voltage Converter and the output amp. The pulse generator is implemented on a chip DD1, the output generates pulses with a period from 1 second up to 70 seconds (Fig.1).
(click to enlarge)
Pulse period is set by resistor R2. The pulses of the first oscillator start a second generator, implemented on the elements DD2.1, DD2.2. The period of these pulses is set by the resistor R6. Thus, the duration pulses of the first oscillator is populated with the pulses of the second oscillator. Pause between bursts of pulses is equal to the half period of the first generator. For regulation of subjective sensations, the output pulses have the same duration generated by the driver on the elements DD2.3, DD2.4. The duration of the output pulses from 50 to 250 μs is set by the resistor R9. At pin 11 DD2.4 the resulting pulses of negative polarity. So output transistor VT3 in the pauses between bursts of pulses is open, and during the the passage of impulses is closed. A load resistor R10 limits output current up to 27-30 mA, providing human security.
The voltage Converter is assembled according to the standard scheme of the multivibrator on transistors VT1, VT2 of the structure p-n-p. Transformer T1 is wound on a ferrite the ring HH 2000NM1. Winding 1 contains h coil wire PEV-0,5, winding 2 contains 2h14 turns, and winding 3 contains 450 turns. Windings W2, W3 are wound wire PEV-0,27 (0,30). First, the coil is wrapped W3, then the two wires windings W1,W2.. the End of one of the windings W1 and W2 connects to the beginning of the second, ensuring the phasing of the windings. If after switching on the Converter output the diode bridge there is no voltage, it is necessary to swap the conclusions 1-3 or 4-6 transformer. Resistor R4 is chosen according to the minimum current consumption and the stability of the Converter start when power is applied. Supply current Converter without load - 20 mA. Total current the neurostimulator is 60 mA. Transformer power supply needs to count on more current, as short-term, when incorporating the inverter consumes a large current. This is due to the installation of a transient of the oscillator.
Drawing of the PCB shown in Fig.2, and the arrangement of elements on the Board - in Fig.3.
The electrodes better to do a round up of beloeil tin (Nickel-plated) diameter 40-50 mm. the edges of the electrodes are rounded needle file so that the electrode is not etched in body. After pripiski thin wires, the solder side is filled with sealant. On the hands and feet electrodes better attach with a shortened elastic bandage. On the trunk should make a special elastic bandage and the button closure or Velcro. If you go to work, the tires can to wear in advance. The approximate location of the electrodes on the body is the beginning and the end of muscles. About the installation of the electrodes (from the manufacturer) is given in Fig.4.
The better attach electrodes on gauze soaked in salted water. If Marley no (or this is not possible), we need to take care of good the contact of the electrode with the body. Otherwise under the electrode will feel a burning sensation. Best sensation under the electrode is spreading. If muscle is squeezed out from the inside. The usual sensation of vibration in time with the pulses, warming. The strength of feeling is regulated by the resistor R9. The change in the position electrodes need to do when you turn off the neurostimulator. Take your time to give maximum pulse duration of exposure - more than small doses healing. It is better to increase the duration. Disease we not sing too one day, they should be treated not just one day. First start with connected electrodes do this so that you can quickly disable the device or electrodes. Short-circuit electrodes to each other are not dangerous. Before connecting the appliance to the patient to try it on so, it is better on the feet.
If you will be using the device on the other, it is desirable to put indication of the passage of the pulse train. For this we need from the output 13 2.4 a DD a resistor of the appropriate value on the minus power supply any led. Led and damping resistor are mounted on the housing cover.
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