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 airline 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 cannula configured to receive breathing gas from the user;
a sensor in communication with the cannula and the PSA system; wherein the sensor is configured to sense a breathing cycle of the user;
wherein:
the breathing cycle includes an inhalation phase and an exhalation phase;
the exhalation phase includes a non-useful period succeeded by a pre-inhalation period;
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;
wherein the cannula is configured such that carbon dioxide (CO2) rich gas output from the user during the exhalation phase of the preceding breath is not re-inhaled by the user during the inhalation phase of the succeeding breath; and
wherein the PSA system is configured to actuate a flow of the oxygen enriched gas via the gas outlet airline at the beginning of the pre-inhalation period of the exhalation phase.
2. The oxygen concentrator system of claim 1 , 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 pre-inhalation period.
3. The oxygen concentrator system of claim 1 , wherein the gas outlet airline is a unidirectional airline configured to flow the oxygen enriched gas to the user.
4. The oxygen concentrator system of claim 1 , wherein the cannula is a bidirectional airline.
5. The oxygen concentrator system of claim 1 , wherein the sensor is located in the cannula.
6. The oxygen concentrator system of claim 1 , wherein the beginning of the pre-inhalation period is defined by at least one of an actual beginning or a predicted beginning of the pre-inhalation period.
7. The oxygen concentrator system of claim 1 , further comprising:
a controller in communication with the sensor, the controller is configured to:
receive breath parameter data from the sensor; and
determine, using the breath parameter data, an actual beginning of the pre-inhalation period; and
wherein the PSA system is configured to actuate the flow of the oxygen enriched gas via the gas outlet airline at the actual beginning of the pre-inhalation period.
8. The oxygen concentrator system of claim 1 , further comprising:
a controller in communication with the sensor, the controller is configured to:
receive breath parameter data from the sensor; and
determine, using the breath parameter data, a predicted beginning of the pre-inhalation period;
wherein the PSA system is configured to actuate the flow of the oxygen enriched gas via the gas outlet airline at the predicted beginning of the pre-inhalation period.
9. The oxygen concentrator system of claim 1 , wherein the PSA system is configured to output a positive end expiratory pressure (PEEP) to the user during the exhalation phase of the user.
10. The oxygen concentrator system of claim 9 , wherein the PSA system includes a plurality of microblowers actuable to output pressurized air via the gas outlet line.
11. An oxygen concentrator system comprising:
a pressure swing adsorption (PSA) system including:
a gas outlet configured to selectively flow oxygen enriched gas or pressurized air 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 cycle of the user;
wherein the breathing cycle includes an inhalation phase and an exhalation phase;
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;
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;
wherein the PSA system is further configured to actuate a flow of the pressurized air via the gas outlet at the beginning of the dead space period of the inhalation phase; and
a cannula configured such that carbon dioxide (CO2) rich gas output from the user during the exhalation phase of the preceding breath is not re-inhaled by the user during the inhalation phase of the succeeding breath.
12. The oxygen concentrator system of claim 11 , wherein the PSA system is configured to flow oxygen enriched gas via the gas outlet at an actual beginning or at a predicted beginning of the inhalation phase of the user.
13. The oxygen concentrator system of claim 11 , wherein the at least one breathing parameter is the actual beginning or the predicted beginning of the inhalation phase of the user.
14. The oxygen concentrator system of claim 11 , wherein:
the PSA cycle includes an adsorption phase and a desorption phase; and
the controller is configured to synchronize execution of the PSA cycle with the at least one breathing parameter.
15. The oxygen concentrator system of claim 12 , further comprising:
a controller in communication with the sensor and the PSA system;
the controller configured to:
receive breathing parameter data from the sensor; and
determine at least one breathing parameter of the use in real time.