SU428754A1 - PACEMAKER - Google Patents

Description

one

The invention relates to medical technology.

Known electric pacemaker designed to reduce the heart rate, containing serially connected extractor R-teeth ECG, a programming circuit, a delay circuit and a driver stimulating pulses. However, it is not possible to regulate the degree of reduction in cardiac rim.

The aim of the invention is to expand the range of heart rate reduction and to maintain heart activity in the event of its disappearance.

For this, an OR circuit is provided between the programmer circuit and the delay circuit, and also between the delay circuit and the driver of the stimulating imimuls, providing a known signal flow through one of its inputs, and a sawtooth voltage generator with a threshold circuit connected to the delay circuit input with the second inputs of both schemes «OR.

The drawing shows a block diagram of a pacemaker.

The device contains an extractor 1 R-teeth electrocardiogram (ECG), programming circuit 2, circuit 3 and 4 "OR, delay circuit 5, shaper 6 stimulating pulses, sawtooth generator 7 and threshold circuit 8. The pacemaker works as follows.

The next impulse from the output of the R-teeth extractor passes through the programming circuit 2 and the OR 3 circuit, is fed to the input of the delay circuit 5 and resets the sawtooth generator. Impulse output

delay circuits 5 through the circuit "OR 4" are fed to the shaper 6 of stimulating pulses, at the output of which impulses are formed, applied through the electrodes to the heart. The magnitude of the delay of the delay circuit 5 is chosen, as in the known devices, of such a magnitude that the stimulating impulse is applied in the phase of relative refractivity and causes hemodynamically ineffective stimulation of the cardiac muscle. Pulses from the output of the R-teeth extractor, corresponding to the hemodynamically ineffective QRS-complexes of the ECG, do not pass through the programming circuit 2. If during a certain period of time, given by the slope of the sawtooth voltage of the sawtooth voltage generator and the threshold value of the threshold circuit 8, there is no natural QRS complex, at the output of the threshold scheme 8 will be

formed momentum