| http://www.w3.org/ns/prov#value | - In addition, this enables using a single fitting configuration to accommodate a wide range of bypass graft sizes. [0081] The base of the fitting (as well as the petals if desired) may be covered with a blood impervious, porous, compliant material such as silicone, urethane, expanded PTFE, PTFE, fluorinated ethylene propylene (FEP), polyester, PET, or other material.
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