The Study of Needle Electrode Characteristics for Venipuncture Electrical impedance Controlling System

摘要

The electrical impedance method is a novel approach for detection of needle puncture to blood vessel. The method is based on sending a small current through needle electrode for measurement of electrical impedance in two-electrode setup. The design of appropriate electrode system, that can achieve the maximum sensitivity for puncture identification, is an actual task. In this study, we propose the use of special electrode system in a form of multilayer coaxial needle electrode. Experimental studies have been carried out on a constructed phantom, which simulate the soft tissues and blood vessel.