Peoplesmart

 

(57) Abstract:

The invention relates to medicine, namely to devices for functional diagnostics. The technical result is to increase the accuracy of measurements, improving the quality of diagnosis. In peoplesmart comprising a generator of sinusoidal current of high frequency, two current electrodes, potentiometric electrodes, a differential amplifier, a linear detector srednetemperaturnogo values and amplifier repetitorium optionally included sensor current value of the excitation current and compensating the channel, consisting of a differential amplifier and a linear detector srednetemperaturnogo values are identical to the previous one, and the compensation unit base values of the impedance, the output of which is connected with the analog vycitalem, the second input vicites connected to the output of a linear detector srednetemperaturnogo values of the channel output with the input of the amplifier peoplesmart channel, moreover, a differential amplifier and detector compensating channel are common to both channels peoplesmart, and blocks of compensation and analog myCitadel built into each channel. 1 Il.

The invention relates to medicine, in the Central and peripheral blood non-invasive and invasive methods.

Closest to the invention to the technical essence is a two-channel peoplesmart type RPG-02, which is designed to study blood flow by measuring the tetrapolar impedance method [1].

The device comprises a generator of sinusoidal current with frequency of 40 kHz, the current from which is fed to the sensed area of the body via the current electrodes, common to both channels.

Measurement of impedances are two identical channels, each of which contains two potentiometric electrode, a differential amplifier of high frequency, the measuring unit, the output of which is connected to the input of medical multi-channel recorder. The measuring unit includes a linear detector srednetemperaturnogo values, symmetrical output of which is connected to the input of the differential amplifier peoplesmart (low-frequency amplifier, and switch device for starting a basic impedance.

With the amplifier output signal is fed to an active low pass filter with a cutoff frequency of 30 Hz, and then at the divider output "PEO". With the release of "REO" signal is sent to an analog differentiating device, and after filtering and amplification is fed to the m output "PLET".

To set scale recording on the recording device (for example, ALCAR, N-338 and others) the instrument is equipped with a built-in calibrator, simulating variations of the resistance of the sinusoidal frequency of 1.59 Hz amplitude 0.1 and 0.5 Ohms relative to the base value of 20 Ohms.

Thus, the known device for blood flow studies contains high-frequency generator, the output of which is connected to the pair of electrodes, called current and two channels, each of which has two input terminals connected to respective pairs of electrodes, called potentiometric and series-connected differential amplifier, the measuring unit and the Registrar.

However, the known device, having a maximum resolution at the level of 0.005 Ohm, does not allow thin blood flow studies. The main reason for the limit of resolution is the fluctuation amplitude of the probe current.

The output voltage detector

U = K(I+i)(Z+z) (1)

or

U = K[I(Z+z)+i(Z+z)], (2)

where K - coefficient of conversion;

I averaged over a long period of time the amplitude value of the excitation current;

i - the value of the fluctuation amplitude C is object;

z - value of the ripple of the base impedance, caused by the inflow and outflow of blood in the investigated volume.

As can be seen from expression (2), a useful signal is the value of I(Z + z), and the resolution of the known device is limited by the value of i(Z + z), which is the voltage noise of the device, refer to the entrance.

The objective of the invention is the improvement of measurement accuracy, readability of the recorded curves and, consequently, the quality of diagnosis by improving the resolution of realtystore.

This is achieved by the dual peoplesmart comprising a generator of sinusoidal high frequency voltage, the output of which is connected to the pair of electrodes, called current and two channels, each of which has two input terminals connected to respective pairs of electrodes, called potentiometric, each channel includes a series-connected differential amplifier, a linear detector srednetemperaturnogo values, the amplifier peoplesmart, according to the invention introduced compensation noise caused by the fluctuation amplitude of the probe current.

The new device is that consistently , with the generator output sinusoidal high frequency voltage, and compensating the channel, consisting of cascaded differential amplifier and a linear detector srednetemperaturnogo values are identical to the previous one, and the compensation unit base values of the impedance, the output of which is connected with the analog vycitalem, the second input vicites connected to the output of the detector channel output to the input of amplifier peoplesmart channel, and a differential amplifier and a linear detector srednetemperaturnogo values of the compensating channel is common to both channels peoplesmart, and blocks the payment base value and an impedance analog myCitadel built into each channel.

The compensation unit base values of impedance serves to maintain in linear mode analog vicites connected to one of the inputs and contains analog-to-digital device storing a voltage proportional to the reference impedance.

When using the proposed peoplesmart, the output voltage detector

U = [(I+i)(Z+z)]-KZ(I+i), (3)

i.e. remain uncompensated only fluctuations iz. Given that the value of z is not more than 1-2% of the value Z, resolving production ability is high resolution.

It contains the generator 1 sinusoidal high frequency voltage, the output of which is connected to the pair of electrodes 2, called current. The other two pairs of electrodes 3, called potentiometric connected to the inputs of the differential amplifiers 4 left and right channels. Both channels contain connected to the outputs of the respective differential amplifiers, detectors 5. Consistently with the current electrodes included sensor 6 current value of the excitation current connected to the second differential amplifier 7, which is loaded on the second detector 8, the output of which is connected blocks of compensation 9. Analog myCitadel 10 have two inputs connected to the outputs of the respective differential amplifiers 5 and blocks of compensation 9. To the outputs of the analog vychitala connected amplifiers 11 peoplesmart, which is connected to the recorder 12.

Peoplesmart works as follows.

The patient superimposed electrodes 2 and 3 by the method of tetrapolar rheography. When applying the excitation current generated by the generator 1, by volume conductor, which is formed by the body of the patient, the potentiometric electrodes 3 difference is created potenziani amplifiers 4 left and right channels amplify the voltage drop, and at the output of the detectors 5 appears a voltage proportional to the base impedances of the respective areas of the patient's body. Baseline (mean) value of the impedance is modulated with a variable component determined pulse wave of blood. Sensor 6 monitors the current value of the probe current, and after amplification and detection in blocks 7 and 8, through the compensation blocks 9, delivers the analog subtractive device 10, where the fluctuation amplitude of the probe current, which is manifested as a noise signal, limiting the resolution of peoplesmart, built according to the classical scheme, are subtracted from the main signal, resulting in compensation of noise. Cleaned the signals from the amplifiers 11 peoplesmart and fed to the recorder 12.

During medical tests peoplesmart, confirmed the increase in its resolution not less than the order in the result made possible check blood flow thin anatomical structures and a detailed study of rogramme larger tissues and organs.

Sources of information

1. M. I. Gurevich and other Impedance realtystore. Kyiv. Naukova d is, Ihad which is connected with one of the two current electrodes, two channels, each of which has two output terminals connected to respective potentiometric electrodes, a differential amplifier, connected in series with a linear detector srednetemperaturnogo value, and the amplifier peoplesmart, characterized in that in series with the second current electrode further include a sensor current value of the excitation current connected to the generator output sinusoidal high frequency voltage, and compensating the channel, consisting of cascaded differential amplifier and a linear detector srednetemperaturnogo values are identical to the previous one, and the compensation unit base impedance values, the output of which is connected with the analog vycitalem, the second input vicites connected to the output of a linear detector srednetemperaturnogo values of the channel output with the input of the amplifier peoplesmart channel, and a differential amplifier and a linear detector srednetemperaturnogo values of the compensating channel is common to both channels peoplesmart, and blocks of compensation base impedance values and the number is

 

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Photoplethysmograph // 2063699
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Photoplethysmograph // 2054884
The invention relates to medical equipment and can be used in functional diagnostics

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1 cl, 3 ex, 1 tbl

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2 tbl

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