Transthoracic impedance measuring circuit and defibrillator

Abstract

The invention discloses a transthoracic impedance measuring circuit and a defibrillator, wherein the transthoracic impedance measuring circuit comprises at least two electrode plates, an alternating-current constant-current source, a voltage detection circuit and a main control circuit; and the main control circuit controls the alternating-current constant-current source to apply alternating-current constant-current signals to an object to be measured through the electrode plates, detects the voltage at the two ends of the object to be measured through the voltage detection circuit, and finally calculates the transthoracic impedance of the object to be measured through the Ohm's law. According to the invention, the characteristic of direct current blocking and alternating current unblocking of a capacitor is utilized; the influence of the equivalent capacitance component in the transthoracic impedance of the object to be measured is eliminated; the equivalent resistance component in the transthoracic impedance is directly measured; and the real-time performance and the accuracy of transthoracic impedance measurement are easily improved.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a transthoracic impedance measurement circuit and a defibrillator. Background technique [0002] In modern clinical medicine, defibrillators are widely used in the treatment of cardiac arrest, which can effectively convert malignant arrhythmia into normal sinus rhythm and save patients' lives. The success rate of defibrillation depends on whether the defibrillation signal defibrillation energy and defibrillation waveform are appropriate, and the patient's transthoracic impedance directly affects the defibrillation energy and defibrillation waveform of the defibrillation signal, so it is necessary to Real-time detection of the patient's transthoracic impedance, and then continuously adjust the defibrillation voltage, current, and duration according to the magnitude of the transthoracic impedance to ensure that the defibrillation parameters meet the requirements. [0003] ...

AI Technical Summary

Problems solved by technology

[0004] At present, there is a lack of a measurement circuit that can eliminate the influence of the equivalent capacitance component and directly detect the equivalent resistance component of the transthoracic impedance of the human body.

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