An oxygen concentrator comprises a product tank that is fluidly coupled to at least one sieve bed, and a product gas accumulator tank that is fluidly coupled to the product tank via a first conduit and to an outlet port via a second conduit, wherein the first conduit and the second conduit are disposed to allow at least a portion of product gas to flow from the product tank to the outlet port.

An oxygen concentrator comprises a product tank that is fluidly coupled to at least one sieve bed, and a product gas accumulator tank that is fluidly coupled to the product tank via a first conduit and to an outlet port via a second conduit, wherein the first conduit and the second conduit are disposed to allow at least a portion of product gas to flow from the product tank to the outlet port.

A battery retaining system for a portable oxygen concentrator includes a first rail configured to receive a first slide of a battery, a second rail configured to receive a second slide of the battery, the second rail being spaced apart from the first rail so as to form a channel configured to receive the battery, and a flexible stiffening mechanism configured to impart a biasing force on a surface of the battery when the battery is received within the channel. The flexible stiffening mechanism includes a protrusion projecting from the first rail at least partially towards the second rail and a slit positioned behind the protrusion and configured to facilitate travel of the protrusion fore and aft.

An adsorber for a gas concentrator includes an adsorbent material having adsorbent particles and a vessel housing the adsorbent material. The vessel includes a vessel wall having a non-circular cross section and at least one stiffening support. A combination of a thickness of the vessel wall and a stiffness of the stiffening support is sufficient to limit deformation of the vessel wall to at least one of less than 0.1 mm and less than 25% of an average diameter of the adsorbent particles under a pressure swing of at least 30 psi within the vessel.

An adsorber for a gas concentrator includes an adsorbent material having adsorbent particles and a vessel housing the adsorbent material. The vessel includes a vessel wall having a non-circular cross section and at least one stiffening support. A combination of a thickness of the vessel wall and a stiffness of the stiffening support is sufficient to limit deformation of the vessel wall to at least one of less than 0.1 mm and less than 25% of an average diameter of the adsorbent particles under a pressure swing of at least 30 psi within the vessel.

A method of operating a compressor system includes determining an efficiency of a compressor configured to operate at a plurality of output flow settings, including one or more of measuring, calibrating, calculating, or modeling motor efficiency over a range of supply voltage and pulse width modulation duty cycle combinations, each combination including a supply voltage of a plurality of supply voltages and a pulse width modulation duty cycle of a plurality of pulse width modulation duty cycles. The method further includes selecting a supply voltage and a pulse width modulation duty cycle for use at at least one output flow setting of the plurality of output flow settings based on the determined efficiency of the compressor, generating the selected supply voltage by maintaining, reducing, or increasing a nominal supply voltage, and applying the selected pulse width modulation duty cycle.

A compressor assembly for a portable oxygen concentrator includes a first compressor chamber having a first connector, a second compressor chamber having a second connector, and a tube having a first end having a first connection interface configured to connect to the first connector and a second end having a second connection interface configured to connect to the second connector. The first connection interface is shaped to maintain the connection between the first connector and the first connection interface in a fixed orientation and the second connection interface is shaped to maintain the connection between the second connector and the second connection interface in a fixed orientation. One or more of the first connector, the second connector, and the tube are compliant.

The invention provides a system and method that applies novel algorithms and compositions for efficiently adjusting compression, unit turn down, pressure and flows of a pressure swing adsorption unit. The present invention also reduces overall horsepower, increases unit's product gas recovery, maximizes product gas quality and allows for non-disturbance of upstream and downstream equipment in regard to pressure and flow oscillations. Raw gas streams addressed include methane (CH4), nitrogen (N2), oxygen (O2), carbon dioxide (CO2), water (H2O), Hydrogen Sulfide (H2S) and non-methane organic compounds (NMOC) gases/vapors. The invention incorporates a CO2 and H2O trim units and provides a VPSA N2 and O2 rejection section.

The invention provides a system and method that applies novel algorithms and compositions for efficiently adjusting compression, unit turn down, pressure and flows of a pressure swing adsorption unit. The present invention also reduces overall horsepower, increases unit's product gas recovery, maximizes product gas quality and allows for non-disturbance of upstream and downstream equipment in regard to pressure and flow oscillations. Raw gas streams addressed include methane (CH4), nitrogen (N2), oxygen (O2), carbon dioxide (CO2), water (H2O), Hydrogen Sulfide (H2S) and non-methane organic compounds (NMOC) gases/vapors. The invention incorporates a CO2 and H2O trim units and provides a VPSA N2 and O2 rejection section.

A secretion trap for use between a patient connection and a patient circuit, the secretion trap including a first connection portion connectable to the patient connection for fluid communication with the patient connection, a second connection portion connectable to the patient circuit for fluid communication with the patient circuit, and a central portion located therebetween. The central portion having a first end portion in fluid communication with the first connection portion, a second end portion in fluid communication with the second connection portion, and a secretion collection well located between the first and second end portions sized to capture and retain secretions therein entering the central portion. The trap may include a drain in fluid communication with the secretion collection well for removal of secretions captured and retained by the secretion collection well.