FY-Ⅰ型双导直接式血流图仪的测量原理是采用电阻抗容积描记法。它是一种无创伤而能较客观地估价生物机体各部位搏动性血液供给强度和相对定量的生物物理学方法,也是近几十年发展起来的一项实验和临床检查的新技术。目前临床应用的血流图仪大部分属于桥式血流图仪,只能用于定性和半定量的研究。直接式血流图仪因受外界干扰影响较小,既可做定性研究,又可做定量分析。它主要用于测定血管阻塞痉挛、扩张等症状,以及检测血液流 FY-Ⅰ-type dual-guided direct blood flow meter measuring principle is the use of electrical impedance plethysmography. It is a noninvasive biopsychological method that can objectively estimate the pulsatile blood supply intensity and relative quantification of various parts of the biological body. It is also a new experimental and clinical examination technique developed in recent decades. At present, most of the clinical application of blood flow diagram instrument belongs to the bridge blood flow diagram instrument, can only be used for qualitative and semi-quantitative studies. Direct blood flow plotter due to external interference less affected, either qualitative research, but also do quantitative analysis. It is mainly used for the determination of vascular obstruction spasm, dilatation and other symptoms, as well as the detection of blood flow