Valves: The two main types are tissue and mechanical. Tissue valves can come from cows, pigs or humans. Mechanical valves are tilting disc or ball, the ball valves are rarely seen now.
Answered 8/17/2013
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Many: Essentially any mobile valve has been used. Mechanical: ball valve tilting disc bivalve tilting biologic: pig valves sewn to a sewing ring bovine tissue - pericardium sewn to a sewing ring homografts.
Answered 9/21/2013
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