Method and circuit for prolonging ventricular refractory period and implantable cardiac contractile force regulator

Abstract

The invention provides a method and a circuit for prolonging a ventricular refractory period and an implantable cardiac contractility regulator. The method comprises the following steps of: after issuing treatment pulses, if an inhibition event exists, recording time t, setting a local sensing event detection window by taking the time t as a center in the next cardiac cycles of N inhibition pulses, and if no local sensing event exists in the N cardiac cycles and the false sensing detection window, judging that the inhibition event is a potential false sensing event. And if a potential false sensing event is judged after M continuous pulses, and the time difference is within the first preset range, the false sensing event caused by the pulses in the local sensing channel can be confirmed. Furthermore, on the premise that it is confirmed that the pulse can cause a false sensing event in the local sensing channel, the refractory period of the ventricle is prolonged, so that it is ensured that the influence of the pulse on the local sensing channel is within the refractory period, and the treatment pulse can be correctly emitted.

Description

technical field [0001] The application relates to the technical field of biomedical engineering, in particular to a method, a circuit and an implanted cardiac contractility regulator for prolonging the refractory period of the ventricle. Background technique [0002] As a medical device implanted in the human body, the implantable cardiac contractility modulator (CCM) is an implantable pulse generator for the treatment of heart failure. Its working principle is to apply electrical stimulation to the ventricular muscle during the absolute refractory period to strengthen the ventricular Muscle contractility, improve cardiac function and clinical symptoms in patients with heart failure. Usually CCM has three electrodes, one is placed in the right atrium (called the atrial channel), and the other two are placed in the right ventricle (in this patent, one is called the ventricular channel, and the other is called the local sensing channel). The heart rate is judged by sensing th...

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Problems solved by technology

[0007] This application provides a method for prolonging the ventricular refractory period, a circuit and an implantable cardiac contractility regulator to solve the problem in the prior art that the treatment pulse cannot be delivered correctly due to the misperception of the treatment pulse on the local sensing channel. question

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