Portable oxygen delivery device

An oxygen delivery device comprising:

• an oxygen delivery module configured to receive compressed air from a compressor comprising a piston having a single rotor configured to orbit around first eccentric on a shaft to compress ambient air into the compressed air, the oxygen deliver module comprising a rotary valve assembly that rotates with respect to a plurality of adsorption beds to selectively transfer fluids through the plurality of adsorption beds in order to separate concentrated oxygen and other gases within the compressed air, the compressor configured to be combined with a vacuum pump comprising another piston having a single rotor configured to orbit around a second eccentric on the shaft to vacuum out the other gases, the compressor and the vacuum being separated by an endplate that excludes one or more motors driving the compressor and the vacuum pump, the endplate overlaying and being adjacent to a stator of the compressor and a stator of the vacuum pump, wherein the endplate completely separates a first housing containing the first stator and a second housing containing the second stator, wherein the stator of the compressor, the stator of the vacuum pump, and the endplate all have the same height measured along a dimension perpendicular to a long axis of the shaft, and wherein the endplate includes a only a single vent hole that extends through the endplate and communicates with ambient pressure, the vent hole being positioned entirely within the endplate and having (1) a first end that communicates solely with an endplate chamber entirely defined by the endplate and entirely contained within the endplate (2) a second end that communicates with the ambient pressure, wherein the vent hole is straight along its entire length and extends radially outward from the endplate chamber to a radial end of the endplate and provides a sole passageway for fluid to vent out of the endplate chamber through the endplate and to atmosphere, and wherein the endplate chamber fluidly communicates with both the compressor and the vacuum such that gas can leak from the compressor or the vacuum into the endplate chamber, wherein the vent hole vents the gas that leaks into the endplate chamber to atmosphere;
• at least one sensor to detect patient breathing;
• and
• a controller configured to control the oxygen delivery module to cause the oxygen delivery module to deliver the concentrated oxygen to the patient based on data from the at least one sensor such that in response to a determination, based on data from the at least one sensor, that no breathing is detected for a first pre-determined period of time, the controller causes the oxygen delivery module to deliver the concentrated oxygen to the patient in continuous flow mode, and in response to a determination, based on additional data from the at least one sensor, that breathing is detected for a second period of time, the controller causes the oxygen delivery module to deliver the concentrated oxygen to the patient in a pulse flow mode.