THE human aortic valve consists of three cusps made of relatively inelastic, muscle-free material about 0.15 mm thick. It opens and shuts about once a second, and withstands a pressure difference of ...

Traditionally, the Ahmed glaucoma valve is used in more complicated cases after other surgical measures have been tried. Increasingly, however, the Ahmed glaucoma valve is being considered as a ...

Pulmonic regurgitation is when blood leaks back into the heart from the pulmonary artery due to weakness in the pulmonary valve. It happens when a pulmonary valve does not close properly. The ...

Variable valve timing (VVT) and variable valve lift (VVL) have very similar names, both referring to variable valve performance. Does that mean that they are basically the same thing? The are most ...

Boston Scientific Corp. said it was recalling its previous generation Lotus heart valve replacement devices following reports of problems with the products' locking mechanisms. The Marlborough, ...

Process automation is a necessity in different industries. The utilization of valves implies that process engineers must select the most suitable actuation devices. The actuator should facilitate ...