A prosthetic valve comprising a conical shaped sheet member comprising poly(urethane urea), the sheet member having a plurality of interstices that are disposed uniformly on the sheet member wall and configured to transition from an open position when the sheet member is in an expanded position, where fluid flow is allowed to be transmitted through the sheet member, to a closed position when the sheet member is in a collapsed position, where the interstices restrict fluid flow through the sheet member.
