CONTROL OF WETTING PROPERTIES OF THE ARTIFICIAL VESSELS SURFACES
The influence of the surface properties of different solid materials on the process of blood flowing through them is analyzed. Based on the dependence of the blood coagulation rate on the wetting properties of the solid surfaces on which it spreads, the urgency of developing an express method of controlling the process of blood wetting of the artificial vessels surfaces to prevent thrombosis is substantiated. The adhesion work which is consumed of blood drainage is determined. The impedance method was developed, which is based on the relationship between the flow rate and the change in impedance The impedance method was developed, which is based on the relationship between the flow rate and the change in impedance of the flat capacitor, between the plates of which is the investigated system blood – implant. The interelectrode space of the cell (the investigated system) can be considered as a heterogeneous dielectric, which is a collection of blood, air, and implant samples. Each of these layers can be represented by a set of capacitors and resistors in parallel and connected in series. In the course of blood drainage on the inclined surface of the test sample of implant material, which is located on the bottom plate of the condenser, the redistribution of blood layers, air and sample of the implant occurs, that is, the dielectric constant of the electrode medium changes. The design of the device implementing the impedance method and the results of laboratory tests are presented. Graphic dependencies for establishing the wetting degree of blood the most used materials in the creation of artificial vessels, which confirmed the need for special coatings to increase the blood coagulation time.
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