SU1250245A1 - Apparatus for measuring pulse wave velocity - Google Patents

Description

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The device relates to medical equipment and can be used for mass screening and for scientific and technical purposes.

The purpose of the invention is to reduce the measurement belt.

The drawing shows a structural electrical circuit diagram of the device.

A device for measuring pulse wave propagation speed 1 and two sensors I and 2 pulses, two formers of 3 and 4 pulses and a display unit 5, a stabilized current generator 6 with a distance sensor 7, a voltage converter 8 - time interval, trigger 9, generator or 10 pulses, two counters 11 and 12 pulses and a dividing unit 13, the first pulse sensor 1 is mechanically connected to the first input of the distance sensor 7, and its output through the first driver of the 3 pulses is connected to the first input of the trigger 9. and reset inputs of the first 11 andSecondly, I2 of the pulse counters and the display unit 5, the second pulse sensor 2 is mechanically connected to the second input of the distance sensor 7, and electrically through the second driver 4 of the pulses to the second input of the trigger 9 and the first input of the voltage converter 8 - the time interval whose second input connected to the output of a stabilized current generator 6, and the output to the first input of the generator 10 pulses, the second input of which is connected by the output of the trigger 9, and the outputs with the counting inputs of the first P and the second 12 pulse counters, cat outputs These are connected to the inputs of the split unit 13, the output of which is connected to the display unit 5 and to the second reset input of the first pulse counter 11.,

The device works as follows

The sensors 1 and 2 pulses are fixed on the human body at a distance from each other so that the pulse wave first acts on sensor 1 and after some time on sensor 2, for example, sensor 1 is fixed at the top third on the shoulder, and sensor 2 - on the train. The sensor housings 1 and 2 are mechanically connected to the distance sensor 7. Distance sensor 7 is wire, nam502A5

tannugo on the drum (not shown). When sensors 1 and 2 are installed, the wire is removed from the drum and its length accurately reflects the distance between the sensors. The electrical resistance of the wire between the sensors 1 and 2 is proportional to its length, i.e. the segment on which the pulse wave propagation velocity is measured. In order to measure this resistance, the distance sensor 7 is connected to one ground cable with the ground bus, the other output to the current generator 6, as well as to the converter

15 8 voltage is the time interval to which voltage is thus applied proportional to the distance between sensors 1 and 2. Transducer 8 voltage 20 is a time interval, for example, is made in a bore of a saw-tooth generator and a comparator (not shown) comparing the saw-tooth voltage and voltage supplied from sensor 7. The greater the distance between sensors 1 and 2, the greater the voltage applied to the input of the converter 8.

After the pulse wave arrives at the pulse sensor 1, the signal from it arrives at shaper 3, the pulse from which, caused by this signal, resets the counters I1 and 12 and the display unit 5 to zero, and also translates trigger 9 into coaxed state. The trigger 9 starts the pulse generator 10, which fills the counter with 12 pulses of frequency f,. After the arrival of the pulse wave to the sensor 2, the signal from it arrives at

 shaper 4, the pulse from which the converter 8 simultaneously starts and returns to the initial state the trigger 9. The last disconnects the generator 10 from the Counter 12, in which the number of pulses remains proportional to the pulse wave transit time between sensors 1 and 2. With the converter 8 outputs 2 pulses, the range of which is proportional to the distance between sensors 1 and 2. The first pulse starts generator 10 (output J), which fills counter I with pulses of frequency f2. Second impulse

55 stops generator 10. Counter 11 receives a number of pulses proportional to the distance between sensors 1 and 2.

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The generator 10 at the outputs has pulse signals of two different frequencies f. and f2 are frequency stabilized. The frequency f is greater than the frequency f, i.e. the number of pulses arriving at counter 11 is greater than the number of pulses arriving at counter 12. Each time the number of pulses and counters 11 and 12 coincide with the dividing unit 13, which is performed, for example, on two K1LR553 chips, the pulse goes to block 5 and resets counter 11, i.e. from block 13, there are so many pulses, how many times the number of pulses arriving at the counter- 11 is greater than the number of pulses arriving at the counter 12. Since the number of pulses arriving at the counter 11,

Editor fe. Kopcha

Composer A. Dmitriev

Tehred E.Chi Mar Corrector L. Pilipenko

Order 4353/4 Circulation 660 Subscription

 VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Rauschska nab., 4/5

Production and printing site, Uzhgorod, st. Design, T

proportional to the distance between the sensors 1 and 2, and the number of pulses arriving at the counter 12 is proportional to the pulse wave passing time between the sensors 1 and 2, then the number of pulses proportional to the velocity of the pulse wave, i.e. Devices 11, 12, and 13 divide the distance between sensors I and 2 by the time it takes for the pulse wave to go between sensors 1 and 2.

The adjustment of the transducer 8 and the generator 10 makes it possible to obtain on block 5 readings equal to the pulse wave propagation velocity expressed in m / s.

Claims (1)

The generator 10 at the outputs has pulse signals of two different frequencies f and f ₂ , stabilized in frequency. The frequency fg is greater than the frequency f, i.e. the number of pulses arriving at counter 11 is greater than the number of pulses arriving at: counter 12. Each time the number of pulses coincides with the counters 11 and 12 from the division unit 13, which is executed, for example, on two K 1LR553 microcircuits , the pulse goes to block 5 and resets the counter And, i.e. from block 13 there are so many pulses, how many times the number of pulses arriving at counter · 11 is greater than the number of pulses arriving at counter 12. Since the number of pulses arriving at counter 11, 1250245 .4 is proportional to the distance between the sensors 1 and 2, and the number of pulses arriving at the counter 12 is proportional to the pulse wave propagation time between the sensors 1 and 2, then the block 5 receives the number of pulses proportional to the pulse wave propagation velocity, i.e. devices I, 12 and 13 divide the distance between the sensors 1 and 2 by the time the pulse wave travels between the sensors 1 and 2. The setting of the transducer 8 and the generator 10 allows you to get on the block 5 readings equal to the propagation velocity of the pulse wave, expressed in m / s. Editor Y. Kopcha Compiled by A. Dmitriev Tehred E. Chizhmar Proofreader L. Pilipenko Order 4353/4 Circulation 660 Subscription