Biomedical Engineering Reference
In-Depth Information
5.8 Photos of two valves with different tissue mounting techniques. In (a), the
Ionescu±Shiley pericardial valve wraps the tissue on the outside of the stent; in
(b) the Edwards PERIMOUNT
Õ
valve wraps the tissue on the inside of the
stent. During valve closure, the tissue will rub against the stent when the tissue
is wrapped on the outside of the stent; when the tissue is wrapped inside the
stent, the tissue rubs against tissue during valve closure. Tissue abrasion against
a cloth-covered stent was the primary mechanism of failure for the Ionescu±
Shiley valve. (Photos reprinted with permission from Edwards Lifesciences
LLC. PERIMOUNT
Õ
is a registered trademark of Edwards Lifesciences
Corporation. All Rights Reserved.)
5.9 Photo of an Ionescu±Shiley valvewhich hadundergone typical accelerated
aging testing in a standard durability tester. Note how the leaflet tissue tore all
along the area next to the cloth. (Photo reprintedwith permission fromEdwards
Lifesciences LLC.)
