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血管容积的描记是通过光电换能装置,直接描记末稍动脉的容积及脉搏波形,从而可了解心率、脉象与外周微循环概况.一、血管容积描记器工作原理因心脏的收缩射血入动脉血管,使血管容积扩张,致光导率降低;当心脏舒张时,由于通过动脉管内的血流减少,则光导率升高,这时利用光电管将光导率的改变转换为电流的变化,再经放大;然后接入显示装置(示波器)或描记装置(心电图机) (图1).
Vascular volume of the tracing through the photoelectric conversion device, a direct description of the terminal arterial volume and pulse waveform, which can understand the heart rate, pulse and peripheral microcirculation profile. First, the working principle of the angiograph Since the contraction of the heart ejection into the arteries Blood vessels, the expansion of the vasculature, resulting in reduced light conductivity; when the heart diastolic, due to reduced blood flow through the arterial duct, then the light conductivity increased, then the use of photocell to change the conductivity of light into the current change, and then by Zoom in; then access the display (oscilloscope) or the staging device (electrocardiograph) (Figure 1).