Frontiers Med. Biol. Engng , Vol. 10, No. 3, pp. 167 – 176 (2000) Ó VSP 2000. Surface pitting of heart valve disks tested in an accelerated fatigue tester HWANSUNG LEE 1 , TOSHIYUKI SHIMOOKA 1 , YOSHINORI MITAMURA 1 , KATSUYUKI YAMAMOTO 1 and TOSHIO YUHTA 2 1 Division of Biomedical Systems Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan 2 Tokyo Denki University, Hatoyama 350-0394, Japan Received 9 October 1998; accepted 30 March 1999 Abstract —There are various reports on the fracture of mechanical heart valves implanted in humans or animals and it has been pointed out that fractures are induced by erosion of the disk surface due to cavitation bubbles. Cavitation erosion on mechanical heart valves was studied using our originally designed accelerated fatigue tester. Several valve housings with different compliance values were used. The number and position of pits on the valve disk were measured using an optical microscope. Disk-closing velocity was measured and cavitation bubbles were monitored by a high-speed video camera. It was found that disk-closing velocity increased and cavitation erosion was enhanced with an increase in compliance of the valve holder. Therefore, careful attention should be paid to the
Frontiers of Medical & Biological Engineering – Brill
Published: Jan 1, 2000
Keywords: cavitation erosion; Mechanical heart valve; compliance structure; accelerated fatigue tester
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