Abstract: An oxygen concentration and compression system includes an oxygen concentrator, a boost stage, a compressor, and a portable container. The boost stage receives oxygen enriched gas at a first pressure from the oxygen concentrator. The boost stage includes a pressure increasing device that increases the pressure of the oxygen enriched gas from the first pressure to a second, controlled pressure. The compressor receives the oxygen enriched gas at the second, controlled pressure and compresses the oxygen enriched gas to a third pressure in the portable container for later use by a patient. A patient outlet provides oxygen enriched gas from the oxygen concentrator or the boost stage for use by a patient.

Abstract: A compressor includes a cylinder assembly in a V4 configuration. A crankshaft of the compressor has a main shaft and first and second eccentric bodies. The two eccentric bodies drive four pistons.

Abstract: A protective sleeve includes an outer member and an inner member slidable within the outer member. The outer member has a tubular portion with a first end and a second end, and an attachment assembly is located at the first end of the tubular portion. The outer member further includes a plurality of spring plungers secured to an inner wall of the outer member. The attachment assembly includes a collar and a drip skirt secured to the collar. The attachment assembly is threadedly engaged to the first end of the outer member tubular portion. The inner member includes a first end positioned within the outer member and a second end. At least a portion of the inner member extends from the second end of the outer member. The inner member is movable relative to the outer member. A plurality of spring plungers are secured to an outer wall of the inner member. The spring plungers extend between the outer member and the inner member.