An adjustable ringprosthesis designed particularly for being sewed onto the ring of the mitral valve or tricuspidal valve of a living heart uses a spring ribbon coiled with an overlap of about a half turn covered in a woven, braided or knitted cuff of a suitable synthetic fiber that can be sewed into...http://www.google.ca/patents/US4602911?utm_source=gb-gplus-sharePatent US4602911 - Adjustable ringprosthesis
