Results 241 to 250 of about 175,360,748 (298)

Design and Development of a New Innovative Transcatheter Mitral Valve

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New polyurethane heart valve prosthesis: design, manufacture and evaluation

Biomaterials, 1996
In light of the thrombogenicity of mechanical valves and the limited durability of bioprosthetic valves, alternative designs and materials are being considered for prosthetic heart valves. A new tri-leaflet valve, made entirely from polyurethane, has been developed.
T G, Mackay, D J, Wheatley, G M, Bernacca, A C, Fisher, C S, Hindle   +4 more
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Elastomeric Valves, a New Design

The International Journal of Artificial Organs, 1995
The convex bileaflet valve replaces the flat biflap inflow valve designed by Long Sheng Yu and the tricusp semilunair outflow valve. One reason is easier manufacturing. Convex bileaflet valves are developed for the 11, 20, 40, 70 and 140cc ventricles.
M.H. Hulsbergen, S. Topaz, A. Kumar, N.D. Bishop, A. Shelton, S. Granger, B.Y. Chiang, L. DE Boer, R.A. Luikenaar, S.F. Mohammed, W.J. Kolff   +10 more
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A new design for a hot blast valve

Metallurgist, 1959
Our plant uses hot blast valves with east bronze ~ings and bronze gate valves. The faults of these valves are: 1) the scarcity and expense of the bronze; 2) the friable surface of the bronze castings, reducing the thermal conductivity of the component.
M. A. Tylkin, V. I. Sivak, I. F. Parfent'ev, M. A. Kropp   +3 more
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Design and Fabrication of New Microfluidic Valves

2007 International Semiconductor Conference, 2007
In this paper we present the design and simulation of a new type of microfluidic valves capable of doing simple Boolean operations: AND, OR. The valves are actuated by the fluid flow, thus eliminating the need to connect them to a compressed air source or to electrical power for electromechanical actuation.
Andrei Avram, Marioara Avram
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A new design of cocurrent valve tray

Chemical and Petroleum Engineering, 1982
MINKhiGP has designed a new cocurrent valve tray whose structural modifications include changing the position of the arc-shaped baffle so that one can regulate the proportion of the gas streams and alter the hydrodynamic conditions in the contact zone.
V. A. Shchelkunov, V. R. Shegai, S. A. Kruglov, Yu. K. Molokanov, B. N. Isaev, B. N. Vizhgorodskii   +5 more
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