OXYGEN MIXING IN A BLOWER-BASED VENTILATOR

摘要

This invention is an oxygen mixing arrangement for, or in a pressure support ventilator in which a modular oxygen-providing assembly is selectively inserted into a greater respiration apparatus (200). Mixing accuracy and controllability is maintained by using gas supplies that have a wide range of pressures. Further, oxygen leakage is minimized by connecting the modular oxygen-providing assembly at a point of the respiration circuit of the greater respiration apparatus (200) that is downstream from a valving arrangement normally used for venting patient exhaust flow and for controlling system pressure by venting excess gas flow to the ambient atmosphere.