plural of Wade-Dahl-Till valve

(medicine) A bag used to resuscitate a patient by supplying air or oxygen directly to the trachea and into the lungs.

plural of bag valve mask

A type of check valve using a disc on a hinge for its function.

A kind of cerebral shunt using two metal discs, each in a restrictive housing at the end of a tube, opened and closed by the pressure of fluid.