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Biomedical subjects

N B Dobrova

Publications and source records attributed to N B Dobrova.

30 records · Page 2Linked to original sources
PubMedDate not supplied

[Analysis of the causes of potential wear and breakdown of elements of artificial heart valves of the disk type].

The reliability analysis of the artificial cardiac valve and experiments made it possible to establish that the ACV reliability is ensured by the physical and mechanical properties of the material, technology observance and thorough control over each operation during the manufacturing process. The accelerated testing of the new MX disk valve made in the USSR showed a satisfactory degree of the disk wear and the absence of breaks-down after 400 million working cycles which is equivalent to ten-years' work in a human body.

Heart Valve Prosthesis↗
PubMedDate not supplied

[Functional characteristics of flexible supporting structures for heart valve bioprosthesis].

Hydraulic characteristics of heart valve bioprostheses mounted on supporting structures of various rigidity have been studied under physiologic conditions. An actual mobility of the supporting structures made of different polymers is determined. Static and dynamic components of the support displacements have been shown to develop as the bioprosthesis is under the load, the dynamic component being strongly dependent upon the rigidity of fastening the bioprosthesis on the axis. It is noted that considerable improvements in hydraulic characteristics of bioprostheses are achieved through the use of flexible supporting structures.

Biomechanical Phenomena↗
PubMedDate not supplied

[Pressure distribution on the surface of the cut-off elements of artificial heart valves].

With hydroaerodynamic investigations into pressure distribution on the surface of blocking components in artificial cardiac valves in the shape of a sphere, semisphere, lens and a disc opening at an angle serving as a basis a quantitative evaluation of the arrangement for the flow separation, evacuation peak regions and congestion zones is given. The highest velocity, greatest evacuation and shear stress occur in a flow-past of a valve having a shape of the lens. The disc valve opening at an angle, as concerns its hydrodynamic characteristics, is superior to the valves of all the other designs considered in the present work.

Aortic Valve↗