SU635967A1 - Device for isolating cardiopulses - Google Patents

Description

The invention relates to medical technology and can be used in medical diagnostic systems. A device for inducing cardio pulses is known, comprising an extraction channel for electrocardiograms made in the form of serially connected electrodes, an amplifier, a filter, a rectifier, a peak detector, a comparator and a single vibrator. You are connected to the comparator of the same channel for electrocardiograms allocation (EX), However, if there is a disturbance and artifacto in the EX The frequency spectrum and amplitude of which coincides with the frequency spectrum and amplitude of the E wave of the ECS, the device selects false cardio pulses (CI which reduces its reliability and accuracy). The aim of the invention is to increase the reliability and accuracy of the cardio pulses on the background of interferences. allocation of cardio pulses, a shift register / generator I and a channel of pulses were introduced, a scheme for “reproducing biosignals characterizing the contractile activity of the heart, made in the form of biosignal sensor, amplifier, filter, rectifier, peak detector, comparator and one-shot, whose rectifier output is connected to the comparator of this biosignal channel that characterizes contractile activity of the heart, the output of the single-channel selection of the electrocardiogram signal is connected to the information input of the shift register, the generator output the pulses are connected to the clock input of the shift register, the output of the shift register is connected to the first input of the AND circuit, the second input of which is connected to the one-shot ka allocation of biosignals characterizing the contractile activity of the heart. The drawing shows a block diagram of a device for extracting cardio pulses. The device has an electrocardiogram extraction channel 1, a biosignal extraction channel 2, heart contractility, a shift register 3, a pulse generator 4, and a logic circuit 5 I. The electrocardiogram extraction channel 1 contains electrodes b, an amplifier 7, a filter 8, a rectifier 9, a peak detector 10, a comparator 11 and a single vibrator 12.

Channel 2 for biosignals that characterize the contractile activity of the heart includes a sensor 13 biosignals amplifier 14, filter 15, rectifier 16, peak detector 17, comparator 18, and rdnvibrator 19.

The basis of the operation of the device is the existing rigid biological time dependence between various biosignals by reflective contractile activity of the heart. This relationship is manifested in the sense of the phase shift between electrocardiogram and phonocardiogram, electrocardiogram and kinetocardiogram, electrocardiogram and rheosignal, etc.

The device works as follows

The electrocardiogram enters through the electrodes 6 into channel 1, where the filter 8 excludes low-frequency components from the amplified amplifier 7 signal arising from the patient's movement, and then through rectifier 9 the signal is fed to the input of the comparator 11 and the peak detector 10.

The voltage at the output of the peak detector 10 varies in proportion to the amplitude of the K wave of the electrocardiogram,

A part of this voltage, which is established by a smaller amplitude of the R wave and a large amplitude of the R ,, 5 and T teeth of the electrocardiogram, is supplied as a reference to the second input of the corator 11,

When the comparator 11 is triggered, the signal from its output allows a one-shot 12, which generates a pulse of constant duration.

Similarly, biosignals, which characterize the contractile activity of the heart, are processed in channel 2, biosignals, phonocardios, kinetocardiols, etc. the one-shot 19 generates a pulse corresponding to a certain phase of the removed signal, for example, the beginning of a systolic wave of the riosignal.

Changing the frequency of the generator 4

pulses set the delay time of pulses coming from the output of channel 1 of electrocardiogram selection. The logic circuit 5 only works if there are two signals at the same time, the first of which corresponds to the tooth of the electrocardiogram, but is delayed by the 3 shift register, and the second specific phase of the biosignal characterizing the contractile activity of the heart (reosignala, finokokardiosignala, kinetokardiosnagala, etc.

If interference occurs in channel 1 of the electrocardiogram selection and channel 2 of the biosignal selection, which characterizes the contractile activity of the heart, they will be shifted in time relative to each other and the skin release of the cardio pulse will not occur.

The proposed device allows to increase the reliability and accuracy of the emission of cardio pulses against the background of interference.

In addition, it allows, when using certain biosignals, to pick up and form cardio pulses corresponding to different phases of heart activity.

Claims (1)

Invention Formula A device for isolating cardio pulses, containing a channel for electrocardiograms, made in the form of series-connected electrodes, an amplifier, a filter, a rectifier, a peak detector, a comparator, and a single vibrator, the output of the rectifier of which is connected to the comparator of the same channel of the electrocardiogram, which is different from that In order to improve the reliability and accuracy of the release of cardio pulses on the background of interference, a shift register, a pulse generator, an AND circuit and a biosignal channel, cardiac contractile activity, made in the form of serially connected: biosignal sensor, amplifier, filter, rectifier, peak detector, comparator and single vibrator, the output of the rectifier of which is connected to the comparator of the same biosignals extraction channel, characterizing the contractile activity of the heart, single vibrator output electrocardiogram extraction channel is connected to the information input of the shift register, the output of the pulse generator is connected to the clock input of the shift register, the output of the register with Whig connected to the first input of the AND gate, a second input connected to the One-Shot timer channel allocation biosignals characterizing cardiac contractility de faculty. Sources of information taken into account in the examination: 1, Patent of Great Britain 1276116, kl.a i N 1972. H