Textile valves long-term performance

In has been shown in the previous sections that polyester fabric is able to behave dynamically like a valve in vitro. Tests were, however, done only over a short period of time. When an assembly is bent, the resistance to bending will be governed by the combined bending rigidity of the individual 

A Satin weave (sample A) Plain weave (sample B) 

The apparatus used for making experimental measurements was a cantilever bending tester (ASTM D1388-07A). Cantilever stiffness is given by Equation [16.5]  

Sample Count (dtex) Filaments/ yarn Ends (/cm) Picks (/cm) Twist Tigntness (Cfabric %) 6,h (mg/ 6e,p (mg/ mm) mm)  

Changes in material and properties after cyclic loading 

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Abstract This chapter discusses the potential of textiles used as heart valve leaflet replacement material. The chapter first reviews the anatomy of the aortic valve, before describing the diseases the valve may undergo and the limits of the noninvasive technologies available to replace the faulty valve. It then presents textile valve manufacture, and the performance that can be obtained in vitro in both the short and long term. Early animal in vivo results are presented in the last section. 

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