Digital reconstructing heart output instrument

Abstract

The impedance waveform reconstructing cardiac output instrument consists of a high frequency constant current source with crystal oscillator, a six-channel impedance detecting circuit, a Z0 temperature correcting circuit, a cardioelectric amplifier, a heart sound amplifier, a timing pulse generator, a A / D converting card, an isolating power source, a computer and corresponding measuring software. It can reconstruct impedance waveform, separate out different impedance components from the mixed impedance signal, draw corresponding waveform figures, measure, calculate, display and print ten cardiac function parameters automatically. The present invention is superior to available automatic cardiac function instrument.

Description

Technical field: [0001] The invention is a medical detection instrument for measuring ten left ventricle function indexes such as cardiac output by using a reconstructed cardiac impedance map, which belongs to the technical field of human body electrical bioimpedance information detection, and is precisely a digital reconstructed cardiac output instrument. Background technique: [0002] Cardiac output refers to the amount of blood discharged by the human heart per minute, and its measurement methods are divided into two categories, invasive and non-invasive. Invasive methods include Fick method, dye dilution method, thermodilution method, etc. These methods need to insert a cardiac catheter into the heart, which has certain damage and risks to the human body, and are basically not used in clinical practice at present. Non-invasive methods include ultrasound, sphygmograph, impedance method, etc. Among them, ultrasound and sphygmograph are basically not used in clinical practi...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the existing problems in the theory and practice of the existing impedance cardiography technology, this instrument uses a six-lead method consisting of 15 electrodes to detect six The mixed impedance changes of the body surface and the corresponding basic impedance of a symmetrical part are substituted into the chest impedance simultaneous equations. After simplified processing, the algebraic reconstruction technology is used to solve the equations, and the computer solves and draws point by point, respectively. Obtain the curves of the impedance change components of the aorta AO, left pulmonary artery PL, right pulmonary artery PR, left ventricle LV, and right ventricle RV, which is called the reconstructed impedance volume map

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