Pulsed pressure swing adsorption system and method
A pressure swing adsorption (PSA) system and methods for controlling each PSA cycle performed by the PSA system to produce oxygen enriched gas during productive portions of a user breathing cycle, and to cease production of oxygen enriched gas during non-productive portions of the user breathing cycle, is provided. The PSA system synchronizes PSA cycle phases including adsorption and desorption phases with a user's individual inhalation and exhalation phases, on a breath by breath basis, such that each PSA cycle can be dynamically varied from a succeeding PSA cycle, in real time in response to variations in the user's breathing cycle. An oxygen delivery device including a breathing cycle sensor provides breathing cycle inputs to a controller for use with at least one algorithm to detect breathing flow phases during each user breath, and to synchronize each PSA cycle to the user's breathing flow phases, on a breath-by-breath basis.
1. An oxygen concentrator system comprising:
a pressure swing adsorption (PSA) system including:
a gas outlet configured to flow oxygen enriched gas to a user of the oxygen concentrator;
the PSA system configured to execute a PSA cycle to produce the oxygen enriched gas;
the PSA system including only one adsorption column;
a sensor in communication with the gas outlet and the PSA system;
wherein the sensor is configured to sense a breathing parameter of a breathing cycle of the user;
wherein the breathing cycle includes a plurality of breaths;
wherein the PSA system is further configured to:
receive, from the sensor, a breathing input defined by the breathing parameter;
determine each respective breath, using the breathing input; and
synchronize execution of the PSA cycle with each respective breath such that at least one PSA cycle is executed during each respective breath;
wherein each respective breath includes an inhalation phase and an exhalation phase;
wherein the PSA cycle includes an adsorption phase and a desorption phase; and
wherein the PSA system is configured to synchronize execution of the PSA cycle with the breathing cycle such that:
actuation of the adsorption phase is synchronized with the inhalation phase; and
actuation of a desorption phase is synchronized with the exhalation phase.
2. The oxygen concentrator system of claim 1 , further comprising:
the PSA system configured to synchronize execution of the PSA cycle with each respective breath such that a plurality of PSA cycles is executed during each respective breath.
3. The oxygen concentrator system of claim 1 , wherein each respective breath includes an inhalation phase and an exhalation phase; and
wherein the PSA system is configured to synchronize actuation of the flow of the oxygen enriched gas via the gas outlet with one or more of the inhalation phase and the exhalation phase.
4. The oxygen concentrator system of claim 1 , wherein the PSA system includes:
an air compressing device configured to output pressurized air;
wherein the gas outlet, the air compressing device, and the adsorption column are in fluid communication; and
wherein the PSA system is configured to selectively actuate the air compressing device to perform at least one of the adsorption phase or the desorption phase.
5. The oxygen concentrator system of claim 4 , wherein the air compressing device is a bidirectional device actuable to:
in a first direction, output pressurized atmospheric air into the adsorption column during the adsorption phase; and
in a second direction, output nitrogen gas from the adsorption column during the desorption phase.
6. The oxygen concentrator system of claim 5 , wherein the bidirectional device includes:
a first plurality of microblowers configured to be actuable in the first direction; and
a second plurality of microblowers configured to be actuable in the second direction.
7. The oxygen concentrator system of claim 1 , wherein the PSA system is further configured to:
predict, using the breathing input, a breathing waveform of the respective breath; and
synchronize an oxygen production waveform of the enriched oxygen gas to the breathing waveform for the respective breath.
8. The oxygen concentrator system of claim 1 , wherein each respective breath includes an inhalation phase and an exhalation phase;
wherein the PSA system is further configured to flow pressurized air via the gas outlet;
the system further comprising:
a controller configured to control flow of the oxygen enriched gas and flow of the pressurized air via the gas outlet;
wherein the controller is configured to actuate a flow of alternating volumes of the oxygen enriched gas and the pressurized air via the gas outlet during the inhalation phase.
9. An oxygen concentrator system comprising:
a pressure swing adsorption (PSA) system including:
a gas outlet configured to flow oxygen enriched gas to a user of the oxygen concentrator;
wherein the PSA system is configured to execute a PSA cycle to produce the oxygen enriched gas;
a sensor in communication with the gas outlet and the PSA system;
wherein the sensor is configured to sense a breathing parameter of a breathing cycle of the user;
wherein the breathing cycle includes an inhalation phase and an exhalation phase;
wherein the PSA system is further configured to:
receive, from the sensor, a breathing input defined by the breathing parameter;
determine, using the breathing input, one or more of a beginning of the inhalation phase or a beginning of the exhalation phase; and
synchronize execution of the PSA cycle with the one or more of the beginning of the inhalation phase or the beginning of the exhalation phase;
wherein:
the inhalation phase includes a useful period and a dead space period;
the dead space period occurs between the useful period and the exhalation phase; and
the PSA system is configured to:
determine, using the breathing input, a beginning of the dead space period; and
synchronize execution of the PSA cycle with the breathing cycle such that the flow of oxygen enriched gas via the gas outlet is ceased at the beginning of the dead space period of the respective breath.
10. The oxygen concentrator system of claim 9 , wherein:
the PSA cycle includes an adsorption phase and a desorption phase; and
the PSA system is configured to synchronize execution of the PSA cycle with the breathing cycle such that:
the adsorption phase is actuated at the beginning of the inhalation phase; and
the adsorption cycle is ceased at the beginning of the dead space period of the respective breath.
11. The oxygen concentrator system of claim 10 , wherein:
the gas outlet is configured to flow pressurized air to a user of the oxygen concentrator;
the PSA system is further configured to actuate the flow of the pressurized air via the gas outlet at the beginning of the dead space period of the inhalation phase.
12. The oxygen concentrator system of claim 11 , further comprising:
the PSA system configured to control the flow of the pressurized air via the outlet such that the pressured air provides a positive end expiratory pressure (PEEP) to the user.
13. The oxygen concentrator system of claim 11 , wherein:
each respective breath is immediately preceded in the breathing cycle by a preceding breath and is immediately succeeded in the breathing cycle by a succeeding breath;
the exhalation phase includes a non-useful period and a pre-inhalation period;
the pre-inhalation period occurs between the non-useful period of the respective breath and the inhalation phase of the succeeding breath;
wherein the PSA system is further configured to:
determine for each respective breath, using the breathing input, the beginning of the pre-inhalation period of the exhalation phase.
14. The oxygen concentrator system of claim 13 , the PSA system is further configured to synchronize execution of the PSA cycle with each respective breath such that:
the adsorption phase of the PSA cycle for the succeeding breath is actuated at the beginning of the pre-inhalation period of the exhalation phase.
15. The oxygen concentrator system of claim 13 , the PSA system is further configured to synchronize execution of the PSA cycle with each respective breath such that:
the flow of the pressurized air via the gas outlet is ceased at the beginning of the pre-inhalation period of the exhalation phase; and
the flow of the enriched oxygen gas via the gas outlet is actuated at the beginning of the pre-inhalation period of the exhalation phase.
16. An oxygen concentrator system comprising:
a pressure swing adsorption (PSA) system including:
a gas outlet configured to flow an oxygen enriched gas to a user of the oxygen concentrator;
wherein the PSA system is configured to:
perform a plurality of PSA phases including an adsorption phase and a desorption phase;
produce the oxygen enriched gas during the adsorption phase; and
cease the production of the oxygen enriched gas during the desorption phase;
a sensor in communication with the gas outlet and the PSA system;
wherein the sensor is configured to sense a breathing parameter of a breathing cycle of the user;
wherein:
the breathing cycle includes an inhalation phase and an exhalation phase;
each respective breath is immediately preceded in the breathing cycle by a preceding breath and is immediately succeeded in the breathing cycle by a succeeding breath;
the exhalation phase includes a non-useful period and a pre-inhalation period;
the pre-inhalation period occurs between the non-useful period of the respective breath and the inhalation phase of the succeeding breath;
wherein the PSA system is further configured to:
receive, from the sensor, a breathing input defined by the breathing parameter;
determine for each respective breath, using the breathing input, the beginning of the pre-inhalation period of the exhalation phase.
17. The oxygen concentrator system of claim 16 , wherein the PSA system is configured to synchronize execution of the PSA cycle with each respective breath such that the adsorption phase of the PSA cycle for the succeeding breath is actuated at the beginning of the pre-inhalation period of the exhalation phase.
18. The oxygen concentrator system of claim 17 , wherein the PSA system is configured to synchronize execution of the PSA cycle with each respective breath such that:
the flow of the pressurized air via the gas outlet is ceased at the beginning of the pre-inhalation period of the exhalation phase; and
the flow of the enriched oxygen gas via the gas outlet is actuated at the beginning of the pre-inhalation period of the exhalation phase.