SU856435A1 - Device for measuring blood yield - Google Patents

Description

(54) DEVICE FOR MEASURING BLOOD DEPIT

I

The invention relates to medical technology and can be used in the study of hemodynamics by the methods of dilution and clearance of radioactive cells.

A device for measuring blood flow is known, comprising a sensor, a coincidence circuit, a pulse counter, a register, an indicator (recorder), a frequency divider, a time relay, a trigger, and a delay element 1.

A disadvantage of this device is the presence of an uncompensated systematic measurement error.

It is also known a device for measuring blood flow, comprising a sensor, a two time relay, a trigger, a series-connected pulse counter, a register, a code-frequency converter and a frequency divider, a recorder, two coincidence circuits, a delay element, the output of which is connected to the counter output terminal. pulses, the second pulse divider and two OR elements, the output of one of which is connected to the control input of the pulse counter, and the input of this element OR is connected to the synchronization input of register 2.

A disadvantage of the known device is the large statistical measurement error, which is determined by the norpemHoctuo measurement of the difference N, -N where „АИ л ,, - N / 1-e- i (1)

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It is known that the statistical error in measuring the difference is

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The purpose of the invention is to reduce the statistical error of measurement.

The goal is achieved by reading a device containing a sensor, an OR element, a delay element recorder, and a first counter in series.

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, J, povegae. and counters-reg. T:) s 10 and i2 --- and the position “-f 1. When rt: and the outputs of the converters 8 and 9, the code is the frequency of the inputs of the recorder 13 pulses are absent. The pulses from the output of the sensor 1 are fed to the counting input of the counter 3, which works on the addition. However, the impulses of the SOT generator 14 impulse to the counting input of counter 4, which works in addition mode. On x; (one of the cashier 3, during the time ts, the number of impulses N arrives (Rabiég for example.

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After dialing N pulses from the pulse output of the counter 3 to the input of the synchronous signal regnstrg: 7 imguls, wasp / process -zipantche in register 7 Vrschchet-;

This is the next impulse through easy-to-sub-UPUM 5 and is designed to control: e-pko; xx scat- ers 3 and 4, which are starting, after this, work out the subtraction.

During the second progheh-lth time, the military t .. B with eetnk 3 posX-number drops.

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iiOTOpoe deduction of the number of the second loop in g: ГС5 number of impulses H-.N, .- |. (t ™ e-).

Hawters Zag ;; s: wouts in yerxcvp о, when the record 4 goes to the zero position nf,; rsY, 4bc of the PREEIOs, its output enters the register 6 synchronization input 6. At the same time, the pulse from the output of the counter 4 through zlemesh- 2 delays enters gga fiiiV.MfTXJjniii metering output 3 1 p pulses, - thxxx: cher;: 3 elsgrint OR 5 minutes control f- ::,; T -,; - ZHOL: XXX - Igkov 3: 4, KOTORyo

hholp x chip; og shzt on slokheghth (starting with the second countdown, the duration of which is 3 nocryisaeT the number of halsp, rzone M). At the same time, jif 1; outputs of converters 8 and 9 (ln; CI5 th conversion and quadratic. Conversion) appear perpendicularly Fute MHyj) hCbb h Stcggay 1 h is equal to

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hchchpk x-boom; 0 pulse frequency i a; o13VODET dsschet to zero, ;; ytulse psfsnoca with p1hadp schchchika-rehistr 10 osilyest him reception and kegs t number | hp rc-hcstra 7. And the white pulse-clock-register-10, and the last output of the latter appears as a pulse-transfer, which comes to the synchronization input, produces a new reception of the tt number from the register 7. The pulse repetition frequency lepenoca at the output of the counter-register 10 F, .- xof (. (9) The pulses of frequency fj come from the output of the converter 9 code-frequency to the input of the frequency divider 11, the division factor of which is 2N. At the output of the divider 11, there appear pulses whose frequency is equal to f "/ 2N. These pulses come to the counting input of the counter-register 12, and the first The impulse counts down to zero, resulting in a transfer pulse appearing at the output of counter-register 2, receiving in it the tt number from register 7. Subsequent pulses, at a frequency f3t / 2N, subtract to the zero of counter-register 12 and a new receiving the number tj from register 7. The frequency of transfer pulses at the output of counter-register 12 is equal to ..., i (f. Registrar 13, for which an electronic digital frequency meter is used, operating in the mode of measuring the sum of two frequencies received by two separate inputs, measure the sum of frequencies r .... i () .: |; t-e tu t L G | -2- + ± v-H «lt« 2,, J t (1-2., ... g.

The sum of frequencies at the outputs of the recorder 13 is numerically equal to the measured logarith. Known device 0.0025

The proposed device0 09stvo

Thus, the Device provides, as compared with the known, a several-fold reduction in the statistical measurement error, which contributes to the overall measurement error.

Claims (2)

1. USSR Automobile Certificate No. 603373, cl; A 61 B 5/02, 1978. 2. USSR author's certificate for application number 2756606/13, cl. A- 61 B 5/02, 1979.