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Mechanical Valves
They are made of a combination of metal alloys, pyrolite carbon and dacron.
Types of Mechanical Valves
Caged-ball Valve (Star-Edwards)
A metal cage with several struts mounted in a circular ring, hollow metal or plastic ball inside cage. Durability is high, but possibility of blood clots forming on or around the valve with the risk of embolism is high.
Tilting Disc Valve (Bjork-Shiley Medtronic Hall)
Mobile lens shaped disc attached to a circular sewing ring by two offset transverse struts. This has high durability and efficiency.
Bileaflet Valve
Two pivoting semi-circular discs that open centrally, mounted
(St. Jude)
Directly onto a sewing ring.
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which organs are involved in respiration of annelid and what is it called ,what by products are formed and how amount of ATP is released?
Three charges are arranged as shown in the figure below. Find the magnitude and direction of the electrostatic force on the charge q = 4.78 nC at the origin. (Let r12 = 0.260 m.)
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