US 12,697,458 B2 · O2 concentrator with sieve bed bypass and control method thereof

Abstract

An oxygen concentrator includes one or more adsorbent sieve beds operable to remove nitrogen from air to produce concentrated oxygen gas at respective outlets thereof, a product tank fluidly coupled to the respective outlets of the sieve bed(s), a compressor operable to pressurize ambient air, one or more sieve bed flow paths from the compressor to respective inlets of the sieve bed(s), a bypass flow path from the compressor to the product tank that bypasses the sieve bed(s), and a valve unit operable to selectively allow flow of pressurized ambient air from the compressor along the one or more sieve bed flow paths and along the bypass flow path in response to a control signal. The valve unit may be controlled in response to a command issued by a ventilator based on a calculated or estimated total flow of gas and entrained air or % FiO2 of a patient.

Claims20

Dependent claims

A method for estimating a fraction of inspired oxygen % FiO2 of a patient receiving ventilatory support from a ventilator, the method comprising:

storing, for each of a plurality of measurements of a flow rate of gas expelled by one or more nozzles of a patient ventilation interface connected to the ventilator, a plurality of measurements of % FiO2 in correspondence with a plurality of measurements of pressure in the patient ventilation interface, the patient ventilation interface including, in addition to the one or more nozzles, one or more apertures for the entrainment of additional ambient air for delivery to the patient;
measuring a flow rate of gas expelled by the one or more nozzles;
measuring a pressure in the patient ventilation interface;
and
estimating the % FiO2 of the patient based on a comparison of the measured pressure to the plurality of measurements of % FiO2 stored for the measured flow rate.

2 more elements

A non-transitory program storage medium on which are stored instructions executable by a processor or programmable circuit to perform operations for controlling an oxygen concentrator connected to a ventilator based on a fraction of inspired oxygen % FiO2 of a patient receiving ventilatory support from the ventilator, the operations comprising:

storing, for each of a plurality of measurements of a flow rate of gas expelled by one or more nozzles of a patient ventilation interface connected to the ventilator, a plurality of measurements of % FiO2 in correspondence with a plurality of measurements of pressure in the patient ventilation interface, the patient ventilation interface including, in addition to the one or more nozzles, one or more apertures for the entrainment of additional ambient air for delivery to the patient;
measuring a flow rate of gas expelled by the one or more nozzles;
measuring a pressure in the patient ventilation interface;
and
estimating the % FiO2 of the patient based on a comparison of the measured pressure to the plurality of measurements of % FiO2 stored for the measured flow rate.

2 more elements

Dependencies are inferred from the claim text.

O2 concentrator with sieve bed bypass and control method thereof

Life of this patent

O2 concentrator with sieve bed bypass and control method thereof

Life of this patent

Abstract

Claims20