External defibrillator power supply protection circuit and external defibrillator

Abstract

The invention embodiment discloses an external defibrillator power supply protection circuit and an external defibrillator; the circuit comprises a control circuit power supply, a transformer, a switch and a switch control unit, wherein the control circuit power supply is connected with one side of a transformer primary coil; the other side of the transformer primary coil is connected with a first end of the switch; the second end of the switch is grounded, and the third end of the switch is connected with a switch drive signal; a first input end of the switch control unit is connected whit the control circuit power supply, a second input end of the switch control unit is connected with the second end of the switch, and an output end of the switch control unit is used for outputting the switch drive signal; the switch control unit is used for outputting the switch drive signal, controlling the switch to be shutdown, when the voltage outputted by the control circuit power supply is lower than a preset voltage threshold. The external defibrillator power supply protection circuit can improve work reliability of the external defibrillator.

Description

technical field [0001] The invention relates to medical equipment technology, in particular to a power supply protection circuit for an external defibrillator and the external defibrillator. Background technique [0002] Sudden cardiac death (SCD, Sudden Cardiac Death) is the main cause of death of cardiovascular diseases, accounting for more than 50% of the total number of deaths from cardiovascular diseases. Most of the causes of SCD are temporary dysfunction and electrophysiological changes on the basis of various cardiovascular diseases, and cause malignant ventricular arrhythmias, such as ventricular tachycardia (VT, Ventricular Tachycardia, referred to as ventricular tachycardia) And ventricular fibrillation (VF, Ventricular Fibrillation, referred to as ventricular fibrillation) and so on. Studies have shown that once ventricular fibrillation occurs, the success rate of defibrillation will decrease by 10% for every minute of delay. After 10 minutes of ventricular fibr...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned power supply protection circuit, due to the fast switching speed of the MOS tube, the transient current is large when the MOS tube is turned on. Due to the internal resistance in the control circuit power supply, the output voltage of the control circuit power supply may be pulled down transiently. , resulting in severe fluctuations in the voltage of the switching power supply protection circuit, resulting in unstable operation or even failure of other circuits or components in the external defibrillator that rely on the output voltage of the control circuit power supply, making the external defibrillator unusable and reducing the The working reliability of external defibrillator

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