Differential vector-cardiograph

FIELD: medical radio electronics.

SUBSTANCE: device can be used for testing cardio-vascular system of patient. Differential vector-cardiograph has high frequency oscillator, common electrode, unit for reading electrocardiogram and radio cardiogram provided with amplification channels and filtration channels, multiplexer, microprocessor unit with common bus, analog-to-digital converter, keyboard, mouse and indication unit. Device provides higher precision of measurements due to usage of electric component heart activity and truth of diagnostics due to ability of representation of results of testing in form of variety of vector-cardiograms in real time-scale.

EFFECT: improved precision.

1 dwg

 

The invention relates to medical electronics and can be used to study the cardiovascular system of man.

The known method for diagnosing the state of the myocardium [1], consisting in the establishment of two electrodes on the chest and ECG at two of their locations with subsequent analysis of the ECG. The disadvantage of this method is the limited accuracy of the measurements.

A known method of differential vector-cardiography [2], which consists in registration of the potentials of the heart using the matrix of electrodes located on the surface of the chest, and building vectorcardiogram linear combinations of values of the amplitudes of teeth Q, R, S, T, ST segments and QR against the corresponding vectorcardiogram norms. The disadvantage of this method are the complexity of the technical implementation with a large number of leads and the limited accuracy of the measurements, as it does not provide for the allocation of the electric component activity of the heart.

The closest in technical essence is a way of separating the electrical component activity of the heart [3], which consists in removing from the same electrodes, the electrocardiogram and roulettegame, obtaining the difference between their Fourier spectra and converting the difference to a temporary function, which is considered the electric component activity of the heart. Not what atcom method are the complexity of the technical implementation with a large number of electrodes and the limited reliability of visual diagnostics.

The technical result of the proposed device is to increase the measurement accuracy due to the use of the electric component activity of the heart and the reliability of the diagnosis due to the possibility of presentation of research results in the form of a large diversity of vectorcardiogram in real time.

The technical result is ensured by the fact that the differential vector cardiograph, containing connected in series RF generator and the common electrode, the electrodes attached to the body of man, and the transmitter of the electrical component activity of the heart, put a block of removal of electrocardiograms (ECG) and remelectro.ru (REG), containing channels of amplification and filtering, the inputs of which are connected to respective electrodes placed on the surface of the thorax in the form of a flat matrix, and the outputs are the outputs of block removal of ECG and REG, connected in series multiplexer, the input of which is connected to the output of block removal of ECG and REG, and ADC, and the transmitter electrical component activity of the heart is made in the form of a microprocessor package with a common bus connected to the control input of the multiplexer, the output of the ADC, the output of the keyboard, release the mouse and the input of the display unit.

Structural diagram of a differential vector cardiograph shown in the drawing.

D. ferentially vector cardiograph contains the RF generator 1, the common electrode 2, block 3 removing ECG and REG, the multiplexer 4, block 5 of the microprocessor (MP) with a shared bus 6, the ADC 7, a keyboard 8 mouse 9, block 10 display.

Differential vector cardiograph works as follows. The output of each channel unit 3 removal of the ECG and the REG signal is formed, consisting of songs the following three types of signals. RF generator 1 through the common electrode 2 provides a flow through the body of the examinee to the electrode unit 3 micro-currents whose values depend on the pulse fluctuations of blood vessels and form the output of block 3 signals REG (RF signals). With the same electrodes simultaneously removed the ECG potentials that form at the output of block 3 of the ECG signals (LF signal), which is the composition of the electrical component activity of the heart (usable component) and component pulse fluctuations of blood vessels (noise component). Channel signals from the output unit 3 sequentially through a multiplexer 4, running unit 5 MP via the bus 6, proceed through the ADC 7 bus 6. Through the keyboard 8 install the necessary software configuration block 5 MP that allows the conversion functions ECG and REG to compensate for the interfering component in the spectral region, and then the inverse transformation to obtain the time-domain function electricallycontrolled activity of the heart (useful component of the ECG) and then use it to build on unit screen 10 of the display differential vectorcardiogram. By mouse 9 on unit screen 10 of the display in real-time control using the cursor in the number and scale of vectorcardiogram, the number and location of active electrodes on which each (only General) vectorcardiogram, in particular, the calculated energy center signal by a matrix of electrodes, and is called from the database, specify and combine vectorcardiogram standards.

Differential vector cardiograph can be made from standard modules and on the available hardware components. Constructive execution of the blocks may overlap or include the construction of the same purposes of the prototype and its analogues. The remaining blocks is determined by their functional purpose in the device and it is known or obvious from the prior art used in the time and frequency ranges. As a software model is used, in particular implements the algorithms described in the prototype [3], as well as standard programs cluster analysis.

Bibliographic list

1. A.S. No. 768392. Method for diagnosing the state of the myocardium / Laadittaessa // BI No. 37, 1980.

2. Patent No. 2136206 (RU). Way differential vectorcardiography / Chesterules etc. // BI No. 25, 1999.

3. Patent No. 2138193 (RU). The method of selection of the electrical component activity of the heart is and / Avignonesi and other // BI No. 27, 1999.

Differential vector cardiograph, containing connected in series RF generator and the common electrode, the electrodes attached to the body of man, and the transmitter of the electrical component activity of the heart, characterized in that it introduced the block of removal of electrocardiograms and remelectro.ru containing channels of amplification and filtering, the inputs of which are connected to respective electrodes placed on the surface of the thorax in the form of a flat matrix, and the outputs are the outputs of block removal of electrocardiograms and remelectro.ru, connected in series multiplexer, the input of which is connected to the output of block removal of electrocardiograms and remelectro.ru, and ADC, and the transmitter of the electrical component activity of the heart is made in a unit of the microprocessor with a common bus connected to the control input of the multiplexer, the output of the ADC, the output of the keyboard, release the mouse and the input of the display unit.



 

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