title: Development of a ceramic heart valve.
abstract: A durable and thromboresistant ceramic heart valve comprised of a single crystal alumina disk and titanium nitride (TiN) valve ring has been developed. Blood compatibility was examined by scanning electron microscopy (SEM) examinations of the valves implanted in sheep for 35 (#1), 26 (#2), 20 (#3), 23 (#4), and 26 (#5) days. The single crystal alumina and TiN surfaces were free of platelet aggregation or fibrin networks, except for some depositions of fibrin and platelets on the outflow TiN ring in #3, and isolated red cells on the outflow TiN ring in #5. Durability testing under high pressure (1750 mmHg = 233 KPa) pulsatile conditions showed that the safety factor of the ceramic valve was more than seven times greater than anticipated. The ceramic valve is promising as an artificial heart valve.
authors.affiliation: Research Institute of Applied Electricity, Hokkaido University, Sapporo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Mitamura
authors.forename: K
authors.initials: K
authors.lastname: Hosooka
authors.forename: T
authors.initials: T
authors.lastname: Matsumoto
authors.forename: K
authors.initials: K
authors.lastname: Otaki
authors.forename: K
authors.initials: K
authors.lastname: Sakai
authors.forename: T
authors.initials: T
authors.lastname: Tanabe
authors.forename: T
authors.initials: T
authors.lastname: Yuta
authors.forename: T
authors.initials: T
authors.lastname: Mikami
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D002516:Ceramics / Q000009:adverse effects; D006350:Heart Valve Prosthesis / Q000009:adverse effects; D008297:Male; D008422:Materials Testing; D055585:Physical Phenomena; D010825:Physics; D010974:Platelet Aggregation; D011474:Prosthesis Design; D012756:Sheep; D013927:Thrombosis / Q000517:prevention & control
chemical_list: D001672:Biocompatible Materials