Laser assessment of leaflet closing motion in prosthetic heart valves |
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| Affiliation: | 1. Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130025 China;2. School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China;3. School of Science, Engineering and Environment, University of Salford, Salford M5 4WT, UK;4. School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL, UK;1. Department of mechanical engineering, École Polytechnique de Montréal, QC, Canada;2. Technopole in pediatric rehabilitation of Ste-Justine UHC, Montréal, Canada |
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| Abstract: | The dynamics of leaflet motion in heart valve prostheses (HVP), and in particular the closing velocity, is believed to be related to the valve sound and possibly to the phenomenon of valve cavitation. This paper describes a non-intrusive laser sweeping technique enabling the study of leaflet motion. The principle of measurement and the equipment involved are presented, together with the results of two commerially available, 29 mm bileaflet mitral valves, a St. Jude Medical, and an Edwards Duromedic valve. Experiments were carried out in a pulsatile mock flow testing loop designed to mimic physiological pressure waveforms and ventricular contraction. Measurements of heart rate were made in the range 70–120 beats min−1, with a ventricular pressure slope range of 1800–5600 mm Hgs−1 and a cardiac output range of 5.0–7.5 litres min−1. Motion analysis of the measured data focuses on the velocity of the leaflet immediately before closure. |
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