| http://www.w3.org/ns/prov#value | - When a stiffener element is formed of two stiffener members 25 and 26 in the manner shown in FIG. 2, the stiffener members may be made from a rigid or semi-rigid material such as stainless steel or plastic, thus providing adequate support to the valve annulus so as to insure that it maintains its proper physiological shape.
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