Key result
A non-intrusive laser sweeping technique was successfully applied in a pulsatile mock flow testing loop to analyze the closing velocity of leaflet motion in two bileaflet mitral valves.
A novel laser sweeping technique enables detailed in vitro assessment of prosthetic heart valve leaflet closing dynamics, which may relate to valve sound and cavitation.
Extends in vitro assessment of bileaflet valve dynamics; leaves open clinical relevance to cavitation or durability.
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 commercially 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.
No takes yet. Share an insight, caveat, or question.
Guo et al. (1990) studied Prosthetic heart valves (in vitro). Non-intrusive laser sweeping technique was evaluated on Velocity of the leaflet immediately before closure. A non-intrusive laser sweeping technique was successfully applied in a pulsatile mock flow testing loop to analyze the closing velocity of leaflet motion in two bileaflet mitral valves.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: