UDC 621.396:534
Measuring
device of biological tissues blood supply on capacitive sensor
S.
G. Suchkov 1, D. A. Aleksandrov 2, V. A. Nikolaevtsev 1,
D. S. Suchkov 1, A.V. Tolstikov 1, Z.
V. Papaeva 1, A. S. Tolstokorov 2
1 Saratov State University
named after N.G.Chernyshevsky, Astrakhanskaya 83, Saratov 410012, Russia
2 Saratov State Medical
University named after V.I.Razumovsky, Bolshaya Kazachia 112, Saratov 410012,
Russia
The paper is received on April 16, 2019
Abstract. 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.
Key words: biological
tissue, blood supply, capacitive sensor, permittivity.
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