U.S. patent application 20150245900 (inventor Elizabeth A. Eaton, Bloomington, Ind.):
"A prosthesis delivery system may include a prosthesis that includes a first end portion being radially movable between a compressed configuration and an expanded configuration. The first end portion may comprise a shape memory material having a transition temperature less than a body temperature such that the first end portion has an expanded configuration at a temperature above the transition temperature and a compressed configuration at a temperature below the transition temperature. The prosthesis may also include a second end portion being radially movable between a compressed configuration and an expanded configuration and a central portion between the first end portion and the second end portion."