VENTILATOR

摘要

A ventilator which includes: at least one pair of reciprocating opposed gas moving means, the internal volume of which is arranged to be reduced and enlarged by a balanced drive, said gas moving means being arranged to move gas at a predetermined pressure and/or volume to a delivery tube; control means for regulating the speed and the distance of movement of the drive; wherein the masses of all moving parts are balanced so as to minimise the vibration of the ventilator in use.