SU133169A1 - Electronic meter of the duration of the latent period of reflex activity - Google Patents

Description

Instruments are known for measuring the duration of the latent period of the reflex activity of a person and of life (the period between the supply of an | irritant and the reaction to it), which is located from the block-generator of electric impulses, the relay and the counting unit.

The proposed electronic meter for the duration of the latent period of the reflex activity provides a high accuracy of time recording, which is achieved by using an electronic relay instead of a mechanical one in previously known designs, as well as by performing a time counter with tarring shading devices in the form of electronic (tube) triggers.

FIG. 1 shows a block diagram of the device; in fig. 2-circuit electronic relay.

The generator produces electrical impulses with a frequency of 1000 Hz; each pulse registered by the counting circuit fixes a time interval of one millisecond. The launch of the counter is carried out simultaneously with the splitting of an object into the object under study. The countdown stops instantly at the moment the response to the stimulus is received. The simultaneity of the two processes of supplying the stimulus and the beginning of the timing of the latent period is provided by an electronic relay, which operates as follows (Fig. 2).

From; a voltage to a capacitor on the capacitor C locks the L1 and Lp. Lamp L, in the unlocked state, transmits pulses from the generator to the counting circuit, lamp L, when unlocked — i delivers a painful stimulus. When the pulsed strobotron L is turned on by the operator, when the start button is pressed, the capacitor C is partially discharged and the lamps L and L are unlocked, i.e., a pain stimulus is simultaneously delivered and the time is counted. With

No. 133169-2, the reaction of the subject closes the contact sensor of the reaction, charging the capacitor Ca, the lamps L1 and La are locked and the count stops.

The metering circuit of the device is a series of sequentially connected trigger devices (flip-flops) in the number of nine elements with an indication — on neon light bulbs and similar to those used in PS-64, B-2 installations, and so on.

For the application of painful irritation, the skin of the test subject is connected in a series circuit: irritation condenser - an object of irritation — a lamp L. When working with a device, in addition to a painful (irritant) irritant, sound, light, and knee o-tendinous stimuli can be applied. In the case of a light stimulus, a light flash of the strobotron L is used, and for sound stimulation a dynamic loudspeaker is included in the strobotron circuit. A knee-tendinal irritation is caused by a blow from a neuropathological hammer, in which there is a contact-pair, which closes on impact. The contact pair switches on the strobotron and from the moment of impact the countdown of the patent period of the lemon – tendon reflex begins.

Subject invention

An electronic meter of the duration of the latent period of reflex activity, consisting of an electric pulse generator unit, a relay and a counting unit, characterized in that, in order to obtain high accuracy of time recording, it uses an electronic relay and an electronic counting device made according to the trigger scheme .

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