| http://www.w3.org/ns/prov#value | - In other words, the majority portion of the membrane 20 over the ring element 10 away from the two opposite ends 36, 37 is essentially free of wrinkles. [0059] As shown in FIG. 7, a plurality of sutures 41, 42, 43 or other securing mechanisms are placed substantially equally spaced at along the contacting zone of the membrane and the first ring surface 12.
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