Defibrillator with extended h-bridge output stage and high voltage discharge method for biphasic sawtooth square wave defibrillation

Abstract

The invention belongs to the technical field of medical electronics, and particularly discloses a defibrillator provided with an extended H bridge circuit output stage and a high-voltage discharge method based on an output stage circuit. The output stage circuit comprises an energy storage capacitor, an inductance coil, current sensors and a plurality of control switches, wherein the control switches are connected mutually to form an extended H bridge circuit switch with three vertical arm bridge circuits and two transverse arm bridge circuits. The high-voltage discharge method comprises the steps that electric energy in the capacitor and induction electric energy in the inductance coil are discharged at a high voltage onto a body of a patient by a defibrillation electrode in a biphase sawtooth waveform mode, so as to terminate fibrillation of a ventricular muscle and implement timely rescue of the patient via the output stage of the defibrillator according to a series of preset bridge circuit switch combinations and control strategies. The defibrillator and the high-voltage discharge method can lower the requirement on a high voltage characteristic of a discharge bridge circuit, individual and accurately-controlled defibrillation electric energy is provided for the patient, the success rate of electric shock defibrillation on a heart is increased, and injures to a cardiac muscle in a defibrillation process are reduced.

Description

technical field [0001] The invention belongs to the technical field of medical electronics, and in particular relates to a cardiac defibrillator with an output stage circuit and a high-voltage discharge method for defibrillation. Background technique [0002] Sudden cardiac death (SCD) is an unexpected circulatory collapse that occurs immediately within 1 hour of clinical symptoms, leading to cardiac arrest, and is the main cause of death from cardiovascular diseases. The epidemiological research results of the Center for Health Statistics in the United States show that more than 50% of all cardiovascular disease deaths are SCD, and the total number of SCD cases in my country is more than 544,000 cases every year; at the same time, in the past few decades, with the aging of the population The occurrence of process SCD is on the rise. Among them, 80% of SCDs are attributed to malignant ventricular arrhythmias, such as ventricular fibrillation (VF, referred to as ventricular f...

AI Technical Summary

Problems solved by technology

Although the above patents and biphasic defibrillation waves are used, the positive phase and reverse phase are essentially only one wave, which is in the form of high-voltage exponential decay and decline.

Its main disadvantages are: (1) The peak portion of the exponential wave exceeds the defibrillation threshold, which wastes energy and is likely to cause excessive stimulation and damage the myocardium; (2) The energy control deviation is large, and the energy released by the defibrillator depends on the chest. Impedance adjustment is difficult to achieve individualized and precise control, especially for patients with extremely high or low impedance; (3) The peak part of the exponential wave requires a higher initial voltage of the capacitive energy storage device and a higher withstand voltage. Fibrillation output stage, increasing the design complexity and manufacturing cost of defibrillator equipment

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