ENTRAINMENT DEVICES AND RESPIRATORY THERAPY DEVICES

摘要

A respiratory therapy air entrainment device (1) has an oxygen jet nozzle (15) mounted at the open, upstream end of an outer housing (10) in axial alignment with the entrance of a diffuser sleeve (30). The diffuser sleeve (30) has a tapered bore (38) along its length and is mounted in the housing (10) by cooperating screw threads (33 and 34) on the outside of the diffuser sleeve and on the inside of the housing. The diffuser sleeve (30) can be screwed towards or away from the jet nozzle (15) by means of a ring (35) on the diffuser sleeve so as to' alter the effective size of the diffuser sleeve and hence the amount of air entrained by the device.