The ideal heart va
The ideal heart valve should be
1- be fully sterile at the time of implantation and be non toxic.
2- be surgically convenient to insert near the normal location of the heart.
3- conform to the heart structure (the size and shape of prosthesis should not interfere with cardiac function.)
4- show a minimum resistance to flow to prevent a significant pressure drop across the valve .
5- have a minimal reverse flow necessary for valve closure , so as to keep the incompetence of the valve allow level .
6- show long resistance to mechanical and structural wear belong – lasting (25 years, ) and maintain its normal functional performance (most not deteriorate over time)
7- cause minimal trauma to blood elements and the endothelial tissue of the cardiac vascular structure surrounding .
8- The valve should also allow probability for thromboembolic complications without the use of anticoagulants .
9- be sufficiently quiet so as not to disturb the patient
10- produce minimal pressure gradient
11- yield relatively small regurgitation
12- minimize production of turbulence
13- not induce regions of high shear stress
14- contain no stagnation or separation regions in its flow field, especially adjacent to the valve super structure .