Improvement of fabrication process of vacuum formed valves for ventricular assist device
真空成形法による補助人工心臓用人工弁の製作と改良

M. UMEZU, M. RANAWAKE, T. NAKAYAMA, K. KOBAYASHI, T. KIDO, C. NOJIRI, T. KIJIMA, T. FUJIMOTO, T. AKUTSU
1996 Jinko Zoki  
Improvement of fabrication process of vacuum formed valves for ventricular assist device. In order to provide an inexpensive ventricular assist device (VAD), we developed a 20mL-VAD which was followed by Prof. Kolffs design, but two problems were found; 1) Big amount of regurgitation through inlet bileaflet valve, 2) High resistance of outlet trileaflet valve. Following trials were carried out to settle them ; 1) In the manufacturing process of the bileaflet valve, elastic material was used
more » ... ead of hard plastic plate. Then, regurgitation could be reduced to 1/6. Moreover, total manufacturing process could be dramatically simplified. 2) In the manufacturing process of the trileaflet valve, leaflet thickness was well controlled around 0.2 mm with the aid of a special ring which was located around the valve mold. Then, lower resistance could be achieved by a thin (0.19mm) leaflet valve. Moreover, all valves could be passed the durability testing for 14 days. These data is helpful towards a pre-production stage of the VAD development.
doi:10.11392/jsao1972.25.43 fatcat:dod6a3b7a5hitombkfyxlztfpe