Измеритель кровенаполнения биотканей на основе ёмкостного датчика

Measuring device of biological tissues blood supply on capacitive sensor

It is proposed to use the portable autonomous devices in practical medicine for the medical emergency, as well as during medical operations. That allow one to estimate the local changes of the patient tissues blood supply quickly and reliably. There are known the rheographic methods for estimation of the blood supply, which consist of biological tissues conductivity measuring with the subsequent evaluation of blood supply, but they have a low sensitivity and a low reliability for a small blood supply. There are devices that implement the spectroscopic and the laser methods for blood supply measuring, but they are very large and they can be used only in the stationary conditions. This paper describes a portable device for measuring of biological tissues local blood supply. This device is based on a capacitive sensor. The physical principles of its operation were described. Mathematical modeling and optimization of the sensor design was carried out by means of the software COMSOL Multiphysics®. It was shown that the sensitivity of a capacitive sensor allows its effective application in the practice of emergency medical services. It was found that exposed to measure signal the living tissues give the indications of the capacitive sensor, which are increase with time. The indications for the dead tissues are decrease with time. This phenomenon allows one to determine living or dead state of biological tissue quickly.