SU957920A1 - Apparatus for monitoring implanted cardiostimulator operation - Google Patents

Description

The invention relates to medical technology, in particular, to devices for monitoring implanted cardiac pacemakers. .

A device for monitoring an implanted cardiac stimulator is known, which contains an inductive sensor and an amplifier interconnected, as well as an indicator f 1.

The disadvantage of this device is the low accuracy of measurement of parameters of stimulation of the pulse, caused by the influence on the inductive, sensor signals of interference.

The purpose of the invention is to improve the accuracy of measurement of parameters of stimulating pulses.

The goal is achieved by the fact that in a device containing an inductive sensor and an amplifier interconnected, as well as an indicator, a pacemaker pulse recovery circuit consisting of a series-connected bipolar former, a first single vibrator, first and second triggers, and a second one-shot and a delay circuit, the bipolar driver being connected to the amplifier and the second one-shot,

the delay circuit is connected to the first trigger and the second single vibrator, the indicator is connected to the first and second triggers, and the single vibrator is connected to the second trigger.

The drawing shows a diagram of the device.

The device contains an inductive sensor 1, an amplifier 2, a circuit for recovering a pulse of a cardiac pacemaker consisting of a bipolar driver: 4, the first single vibrator 5, the second single vibrator 6, the delay circuit 7, the first 8 and the second 9

15 triggers, as well as indicator 10.

The device works as follows.

In inductive sensor 1, located near the contour formed by

20, a pacemaker, its electrodes and a heart, dampening electric oscillations occur under the action of the front and the decline of the pacemaker pulse. These signals are amplified25 with amplifier 2 and from its output they go to bipolar driver 4, which, regardless of the polarity of the input signal, generates a positive pulse. The front of this pulse triggers one-shot 5 and 6, with the duration of the generated pulse of the one-shot 5. longer, and the one-shot 6 less than the possible duration of the pulse of the pacemaker. The operation of the flip-flops 8 and 9 is allowed only for the duration of the pulse of the one-shot 5 supplied to the R-inputs of these flip-flops. One-shot b impulses are received at the counting input of flip-flop 8, delayed relatively by the enable pulse by an amount determined by the delay circuit 7, and sufficient for the trigger 8 to operate reliably at the counting input. As a result, the trigger 8 of the one-shot of the one-shot of the one-shot, the trigger 8, is brought to the one state, and the second pulse following it, which corresponds to the drop of the stimulating pulse, returns the trigger 8 to the zero state, while the trigger 9 is switched to the single state. With the end of the pulse of the one-shot 5, the flip-flop 9 returns to the zero state, and both the flip-flops 8 and 9 stay in this state before the start of the next one-shot of the one-shot 5 Thus, at the forward output, the trigger 8 forms a pulse that is equal in duration to the pulse of the cardiac of the torus, and at the forward output of the trigger 9, the pulse duration is equal to the difference in the durations of the pulses of one novibrator 5 and the trigger 8. The signal (from the direct output of the trigger 8) and control (from the direct output three tera 9) pulses arrive at the corresponding inputs indicator 10, which measures the duration and period of the recovered pulses of the pacemaker. If amplifier 2 is triggered by interference from inductive sensor 1, bipolar driver 4 triggers one-shot 5 and 6f and trigger 8 is triggered, but trigger 9 remains in zero state. As a result, there is no control pulse, and no indication of the measurement result is made. Due to the introduction of the pacemaker pulse recovery scheme 3, the accuracy of the measurement of the time and frequency of stimulation of the pulse is improved. The invention is a device for monitoring an implanted cardiac pacemaker containing interconnected inductive sensor and amplifier, as well as an indicator. This is due to the fact that, in order to improve the accuracy of measurement of parameters of stimulation pulses, a pacemaker pulse recovery scheme consisting of a series-connected bipolar driver, a first single vibrator, the first and second triggers, and a second single vibrator and a delay circuit are introduced into it. The bipolar driver is connected to the amplifier and the second one-shot, the delay circuit is connected to the first trigger and the second one-shot, the indicator is connected to the first and second switches, and vy rdnovibrator connected to the second trigger. Sources of information taken into account in the examination 1. Patent of England No. 135016, cl. A 61 N 1/36, published. 1974.

Claims (1)

Claim A control device-implanted pacemaker containing an inductive sensor and amplifier connected together, as well as an indicator, characterized in that, in order to increase the accuracy of measuring the parameters of stimulating pulses, a pacemaker pulse recovery circuit is introduced into it, consisting of serially connected ^: bipolar shaper , the first one-shot, the first and second triggers, as well as the second one-shot and delay circuit, moreover, the bipolar driver is connected to the amplifier and the second one novibrator, the delay circuit is connected with the first trigger and the second one-shot, the indicator is connected to the first and second triggers, and the first one-shot is connected to the second trigger.