SU1258372A1 - Apparatus for treatment of patients ill with myocardial infarction in recovery period - Google Patents

Description

The invention relates to medicine, mainly to cardiology, and can be used in the practice of hospital-polyclinic and sanatorium-resort rehabilitation facilities.

The purpose of the invention is to reduce the duration of treatment and prolong the remission.

The drawing shows a block diagram of the device.

The device consists of a pulse sensor 1 connected in series, a preamplifier 2, a first filter 3, a differentiator 4, an output amplifier 5, a recording unit 6, a second filter 7, an integral comparator 8, a relay 9 (with switching contacts), which is intended for alternately connecting generators 10 and 11 pulsed currents (for example, two ElectroSon-AT devices tuned to different frequencies) to the electrodes 12 are found on the patient's mask.

Switching Biosynchronizer Consists of amplifier 2, (which is mounted in close proximity to the pulse sensor to reduce losses during the transmission of a sphygosignal), filters 3 and 7, differentiator 4, amplifier 5, recording unit 6 and relay 9. Switching biosynchronizer molset to be presented and shed as a separate unit 1, the biosynchronizer is powered by a two-pole power supply unit.

The recording unit 6 is a controlling two-channel oscilloscope (for example, an oscilloscope is connected to the output amplifier by one channel and the other channel to the output of the switching biosynchronizer parallel to the mask electrodes)

The pulse sensor 1 is a pulsar receiver connected to a sphygm converter.

The amplifier 2 sfigmosigna assembled on the operational amplifier (chip) K 140UD8.

Filters 3 and 7 are second-order filters with a cut-off frequency of 30 Hz, collected on operational amplifiers,

Differentiator 4 is assembled according to the classical scheme based on an operational amplifier,

Reed relays 9 - RES 55 with switching contacts.

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The device works as follows.

In the pulse sensor (sphigm transducer) 1, mechanical vibrations from the wall of the pulsating carotid artery are transformed into a weak electrical signal, which is amplified by amplifier 2,

Next, the signal is cleared of interference on the first filter 3, after it arrives at differentiator 4, where it is converted into the first derivative of the carotid artery sphygmogram (or the differential curve of the rate of change of 5 of the sphygmos signal).

After that, the differentiated electrical signal is amplified by amplifier 5 and, for visual control, is fed to the first channel of the recording unit 6, for example, an oscilloscope 6. After amplifier 5, the signal is filtered by the second filter 7 and fed to the non-ventilation input of the comparator 8,

Differentiated sphygosignal is a curve that has a positive heart systole and a half wave negative with a lastole

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and the zero crossing zone.

Since the inverting input of the comparator 8 is connected to a housing having zero potential, the input voltage is compared with 0.

At a positive input signal half-wave, a positive voltage level occurs at the output of the comparator 8, approaching the supply voltage (+ UF), which, after limiting the zener diode, opens a transistor switch that includes a relay that connects the pulse first electrical generator with the patient's electrodes during the systole.

In the case of a negative input signal at the output of the comparator 8, a level of negative voltage arises, which is not passed through by the elements US2 and UT1. When the input voltage passes through zero at the output of the comparator 8, the voltage is absent. Thus, in the period of diastole, the relay 9 is de-energized and, by its contacts, connects to the patient's electrodes a pulsed second generator. In the following, the entire cycle is repeated.

To control the first channel of the oscilloscope, the first derivative is displayed (differential curve

speeds) sphygmograms of the carotid artery, and on the second channel - alternation of impulse currents of various frequencies synchronized with its phases.,

The switching biosynchronizer is mainly assembled on operational amplifiers with field-effect transistors at the input, which are the basis for constructing lampless amplifiers with

ultra-high input impedance 10 pulse current sensitivity and low noise. It provides variable frequency.

Editor S.Patrusheva

Compiled by V.Skorobogatov

Tehred L.Oleynik. Proofreader V.Sinitska

Order 6294 Circulation 660 Subscription

VNIIPI USSR State Committee

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

Production and printing company, Uzhgorod, st. Project, 4

High accuracy in operation, compactness and complexity in the manufacture of a switching biosynchronizer included in the device that implements the treatment method, since the threshold current (subthreshold) pulse current is within 4-6 mA. Such a milder impact is due to a rather high subjective

Claims (1)

DEVICE FOR TREATING PATIENTS WITH MYOCARDIAL INFARCTION DURING RECONVALENCE, containing a pulse current generator, electrodes connected to the first input of the recording unit, and two amplifiers, characterized in that, in order to reduce the treatment time and lengthening, the remission is equipped with an additional pulse generator current, a comparator, two filters, a differentiator, a relay and a pulse sensor, which through a series-connected first amplifier, a filter and a differentiator is connected to the input of the second amplifier, the first output to torogo connected to the second input of the recording unit, and the second output via a series connected second 'filter and a comparator connected to the first input of the relay, second and third inputs of which are connected respectively with the main and auxiliary generators, pulse current and the output relay is connected to the first input of the recording unit. 1258372 A1 I