SU814335A1 - Device for analysis of electric signals from biological object - Google Patents

Description

one

The invention relates to experimental medicine and can be used in measuring the level of electromagnetic, especially high-frequency pickups on the electrodes of an implanted pacemaker.

Known 1tudystroy for analysis. electrical signals from a biological object, including a cardiograph and an iMiliated cardiostimulator in.

However, the known device does not provide a determination of the magnitude of the pickup at the terminals of the implanted pacemaker.

The purpose of the invention is to determine the amount of pickup at the terminals of an implanted cardiac pacemaker.

The goal is achieved in that in the device the implanted pacemaker has a power source, a series-connected controlled pulse generator and an amplitude driver, as well as a series-connected key buffer stage and an amplitude value detector, the output of which is connected to the control input of the pulse generator, while the input key combined with shaper output

the amplitude, which is the output terminal I1 of the vented cardiac pacemaker, and the control key input is connected to the output of the controlled pulse generator.

1 shows an immobilized cardiac pacemaker of a device for analyzing electrical signals from a biological object 6; in FIG. 2, an ECG recording is shown. 11th standart lead. O- without interference, with- with interference.

The device contains a cardiograph. not shown) and implanted

A 5 pacemaker, which has a power source 1, a serially connected controlled pulse generator 2 and an amplitude shaper 3, is also connected in series with a key 4, a buffer stage 5 and an amplitude value detector 6, the output of which is connected to the control input of the pulse generator 2, at the same time, the input of key 4 is combined with

5 output shaper 3 amplitudes

the output terminal 7 of the implanted pacemaker, and the control key input 4 is connected to the output of the controlled generator 2

0 pulses.

The device works in a clever way.

The induced voltage enters the output terminal 7 of the pacemaker and then through the public key 4 to the buffer stage 5, is detected by the amplitude value detector b. At the output of the detector b of the amplitude value, a constant voltage is proportional to the amplitude of the interference voltage. This voltage is the control for the controlled oscillator 2, the pulse period of which is proportional to the controlled voltage and, therefore, to the peak value of the pickup voltage. The pulses of the generator 2 are fed to the shaper amplitude and then through the electrodes on the heart or muscle of the animal. When a pulse arrives from generator 2, key 4 is closed, therefore the pulse of generator 2 after shaper 3 does not go to degenerator 6 and does not distort the measurement results.

Thus, for example, the voltage of the stress on the myocardial monoelectrode from the cardiac pacemaker EX-2, which is distal to the left ventricle of the dog's heart, is measured. A measuring pacemaker with a steepness control characteristic S of 20 ms / V is connected to the paraximal end of the electrode. The pacemaker is implanted on the right side of the abdomen subcutaneously, and the electrode is implanted into the cavity, and the UHF-therapy apparatus (radiation frequency 40, 68 MHz) is used as a source of interference. The electrodes of the UHF-therapy apparatus are arranged longitudinally above the site of implantation of the cardioelectrode. Radiation power 70 watts. An ECG recording is performed in the 11th standard lead. The obtained curves are shown in Fig. 2 a) without interference and b) with interference. In the presence of interference voltage, the period following the stimulating pulses was reduced by T 100 ms, i.e. The voltage of the pickup on the cardiac pacemaker electrode was ROSEHI T / S 5B.

The use of a cardiac pacemaker in the device, the pulse period of which is proportional to the amplitude of the pickup and determining the amplitude of the pickup based on the measured period of the pulse of the pacemaker, from an external cardiographic lead, increases the accuracy of the measurement of the amplitude of the pickup, since the measurement results do not depend on the area not controlled. contact electrode-tissue and the condition of the heart or the heart of the animal. In addition, the proposed device allows accurate measurements at high frequencies of pickup, where contact methods are difficult to apply.

Claims (1)

1. USSR author's certificate No. 627829, cl. A 61 N 1/36, 1977. SOHMI V ./ O-a Lj JLJV /