Biomedical subjects

R V Iurechko

Publications and source records attributed to R V Iurechko.

4 recordsLinked to original sources

PubMedDate not supplied

[Experimental study of artificial disk heart valves].

The paper provides the results of an experimental study of domestic artificial EMIKS disk cardiac valves during simulated pulsing flow. The operation valves was examined in the aortic position by photochromic visualization. The patterns of flow velocities beyond the valves during the whole operating cycle were obtained. The models of EMIKS valves at opening angles of 65 degrees and 80 degrees and the model with acoustic clearance in the design of a disk movement stopper were exploded. The findings may be useful for cardiac valves designers in evaluating the impact of designing features of a valve on its hydrodynamic characteristics.

Aortic Valve↗

PubMedDate not supplied

[An experimental study of acoustic noise of heart valve prostheses].

The paper deals with the acoustic noise that accompanies the work of artificial cardiac valves (ACV). The generation of a noise signal is a substantial disadvantage of ACV work after implantation. A highly sensitive solid-state probe was used to measure the noise signal. The disc ACVs Bjork-Shiley (USA), Omniscience" (Italy), MIKS, a basic (Russia), MIKS with an acoustic gap (Russia), and MIKS-3 were tested. The valves worked under model physiological flow. The disc valves of the MIKS series with an acoustic gap manufactured by ROSINVEST (Russia) were found to have the least noise.

Acoustics↗

PubMedDate not supplied

[Study of functional parameters of prosthetic cardiac valves].

A set of methods is offered, which enables to examine, with more details, the functional characteristics of the valves and to analyze them comparatively. The thus obtained functional characteristics make it possible to compare the valves and to select the best one prior to implantation. The results of a clinical study of the functioning of a valve, implanted by a new method involving a high-sensitivity solid sensor, are described.

Aortic Valve↗

PubMedDate not supplied

[Two-leaflet artificial heart valve with the common turn axis for leaflets].

The paper describes the main results of calculations and studies of a basically new model of a two-leaflet valve which greatly differs from the St. Jude two-leaflet valves used in clinical setting. The main difference is that the two leaflets are fixed on one turn axis displaced from the axis of symmetry of the ring-carrying valve. The paper calculates the values of displacement (eccentricity) of the leaflet turn axis against the axis of symmetry of the ring-carrying valve. The new model of the valve is conventionally called Butterfly. The eccentricity of the new valve for the whole dimensional series is calculated by using experimental findings and the conditions for optimizing an effective valve opening. The strength of the axis of leaflet turning and attaching is also calculated. The results of experimental studies of the hydrodynamics of two models of the Butterfly valve by employing photochromic imaging are presented. The results of rapid filming were used to determine the time of closure and opening of the two models of valves.

Heart Valve Prosthesis↗