SU1097342A1 - Implanted cardiostimulator - Google Patents

Abstract

IMPLANTABLE CARDIOSTIMULATOR containing series-connected power source, stimulating impulse generator, and signal generator, characterized in that, in order to increase service life, the first reed switch, delay circuit, and one-shot are added to it, as well as the second reed switch associated with the signal generator , one-shot and first reed switch, the first reed switch is connected to the power source, and the one-shot is connected to the signal generator.

Description

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8 110 The invention relates to medicine, namely to implantable cardiac pacemakers. Implantable cardio pylori are known, which contain the source of the stimulating impulse generator and the signal generator U. A disadvantage of the known pacemakers is the low service life. PTs are known implantable cardiac multilators that contain power sources, a stimulating pulse generator, and a signal generator 2. A disadvantage of these pacemakers is the low lifespan caused by the constant connection of the signal generator to the output of the stimulator. The purpose of the invention is to increase the service life. The goal is achieved by the fact that an implantable cardiac stimulus containing a series-connected power source, a stimulating impulse generator and a signal generator, are sequentially connected to the first reed switch, delay circuit and one-shot, as well as the second head, connected to the signal generator, single-shot and the first reed switch, the first reed switch is connected to the power source, and the one-shot is connected to the signal generator. FIG. 1 shows a block diagram of the device; in fig. 2 is an example of the construction of a signal generator. The device contains a power source 1, a generator of stimulating pulses 2, conclusions 3 for connecting the electrodes, the first and second reed switches 4 and 5, the first reed switch sensitive to a weak and the second to a strong magnetic field, delay circuit 6, one-shot 7 and signal generator 8. The delay time of circuit 6 is chosen longer than the longest bounce time of the reed switches 4 or 5. The pulse duration of the one-shot 7 is chosen to be approximately equal to five periods of following stimulating pulses. Signal generator 8 (Fig. 2) is made according to a known generator circuit with inductive feedback on a transistor 9, an oscillatory circuit 10, which includes element 11, the capacity of which depends on control 2 of the voltage that goes to it from input 12 controlling the frequency of the signal generator 8 through a resistor 13. The difference from the known circuit is that the base resistor 14, which determines the operating mode of the transistor 9, is connected to the input 15 of the control signal generator. The signal generator is powered by stimulating pulses, i.e. in the presence of a voltage at the input 15 of the signal generator, torus 8, and with the arrival of a stimulating pulse, the signal generator 8 generates radio oscillations emitted into space, the frequency of which is determined by a controlled voltage at the input 12 of the signal generator 8. In the absence of a voltage at the input 15, the transistor 9 is closed, the generator is not working, there is no current consumption. The signal generator 8 can be performed in a different way, however, its operation must be controlled, the frequency must depend on the monitored voltage, and in the absence of an authorization for the operation, the current consumption should be absent or insignificant compared to the operating mode. After implantation into the patient's body, the pacemaker works in the normal mode of stimulation of the cardiac activity. Before the impact on the cardiac stimulator by an external weak or strong magnetic field, the reed switches 4 and 3 are in the initial state, the single-oscillator 7 is not powered, the signal generator 8 does not work. When exposed to a weak external magnetic field, for example, using a magnet, the first reed switch 4 is triggered, the one-shot 7 is supplied with a supply voltage. After a time determined by the delay circuit 6, a single vibrator 7 is triggered, which produces a pulse during which the signal generator 8 is allowed to operate. The frequency of the radio oscillations of the signal generator 8 depends on the voltage of the power supply 1. When exposed to a strong external magnetic field, for example, using another, stronger magnet, both reed switches 4 and 5 are triggered, the one-shot 7 is also started, and before the end of the one-shot pulse the signal generator 8 works,

from the amplitude of the stimulating pulse. The pulse duration of the one-shot is sufficient for one measurement.

Thus, regardless of the duration of the action of an external magnetic field, weak or strong, the signal generator 8 transmits briefly,

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The information on the magnitude of the voltage of the power source 1 or on the amplitude of the stimulating pulse, and at the beginning of exposure to a magnetic field. This ensures a reduction in the energy consumption of the power source 1 for monitoring the state of the cardiac pacemaker, and therefore, and an increase in its service life.

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Claims (1)

IMPLANTED Pacemaker containing a serially connected power source, a stimulating pulse generator and a signal generator, characterized in that, in order to increase the service life, a first reed switch, a delay circuit and a one-shot, and a second reed switch connected to the signal generator are inserted in it one-shot and the first reed switch, and the first reed switch is connected to a power source, and the one-shot is connected to the signal generator. 1 1 2 1 5 \] 6 ! 7 1_ J 8 1 1097342