The pulse current

The pulse current is the electric current, recurrent short-term portions (pulses). Medicine usually use the pulse current, consisting of rhythmically repetitive pulses constant direction and different shape - rectangular, trapezoidal, triangular, exponential (currents branches wrapping) or impulses sinusoidal current.
The main characteristics of pulse current are: the amplitude a, duration t and period T, or repetition rate, and form of impulses .
Acting normal motor nerve or muscle, single pulse even for a small duration and intensity causes rapid and short-term reduction of muscles. When partially damaged nerve impulses even ten times longer duration and several times greater intensity only cause flaccid muscles. In such cases apply pulses with gradually increasing intensity (exponential). Rapid pulses of more than 20 in 1 sec.- cause tetanicescie muscle contraction. These features reactions neuromuscular system on the action of the pulse current formed the basis of electric diagnostics and electrostimulation. Electrostimulation is to maintain power and muscle functions for the period of restoration of the damaged nerve or temporary inactivity muscles.
Fes choose this type pulse current, which would tetanicescie reduction at minimum power current and least painful irritation. First of stimulation tehnicheskih abbreviations used the so-called paradisal, using the current induction coil Faraday. With the advent of electronic devices faradic current replaced by a similar action and easily measurable "titaninium" shock. During treatment with this current reduction must alternate with pauses. The device Wei-1 is designed for various types of electric diagnostics and Fes.
Devices "Amplipuls-3" (lamp) and "Amplipuls-ST" (transistor) generate alternating currents frequency 5000 Hz modulated sinusoidal in a series of oscillations low (10 to 150 Hz) frequency. Sinusoidal modulated currents are used in the treatment of radiculitis, vegetative-trophic disorders, neuralgia, neuritis, of plexitis, neuromyositis, obliterating endarteritis, the consequences of traumatic injuries, sinusitis, subacute and chronic inflammatory diseases of female genital organs.
Diadynamic currents (Bernard currents) - half-sine pulse constant polarity with the frequency of 50 and 100 Hz. These frequencies are used separately or in continuous alternation of the "short" or "long" periods. Indications for use diadynamic current is the same as for sinusoidal modulated current, but called diadynamic current irritation of receptors and skin, painful sense of stinging and tingling under electrodes limit its application (is contraindicated in disorders of the autonomic nervous system). The sources of these currents are the device SNEEM-1, and is designed to assist at the bedside device model 717.
Impulse current with a rectangular pulses at a frequency of 100-200 Hz and the ratio of the pulse duration to the hiatus as of 1 : 10 (Leduc current) have an analgesic effect and can cause electronarcon. Impulse current with a rectangular pulses are applied in therapy, electrosleep. Cm. also Electrotherapy.