Method and systems for the delivery of oxygen enriched gas

1. A method comprising:

generating a pressurized stream of ambient air using a compression system of an oxygen concentrator;

separating at least some nitrogen from the pressurized stream of ambient air to produce oxygen enriched air using a canister system of the oxygen concentrator, wherein the canister system comprises a canister containing a gas separation adsorbent;

detecting a plurality of successive breaths, wherein each breath is detected using a pressure sensor coupled to an outlet of a conduit for providing a user of the oxygen concentrator with the oxygen enriched air;

determining, a change in breathing rate over a predetermined period of time based on a comparison between breathing rates derived from successive groupings of the detected plurality of successive breaths;

adjusting an inspiration breath pressure threshold based on the determined change in breathing rate over the predetermined period of time; and

comparing the adjusted inspiration breath pressure threshold with a pressure signal obtained from the pressure sensor to determine when to provide the user with a bolus of the oxygen enriched air through the conduit.

2. The method of claim 1 , wherein the adjusting the inspiration breath pressure threshold comprises increasing the inspiration breath pressure threshold when the determined change in breathing rate over the predetermined period of time is greater than a predetermined threshold.

3. The method of claim 2 further comprising:

switching the oxygen concentrator to an active mode when the determined change in breathing rate over the predetermined period of time is greater than the predetermined threshold.

4. The method of claim 2 , wherein the predetermined threshold is an increase of two breaths per minute.

5. The method of claim 1 , wherein the adjusting the inspiration breath pressure threshold comprises decreasing the inspiration breath pressure threshold when the determined change in breathing rate over the predetermined period of time is less than a predetermined threshold.

6. The method of claim 5 further comprising:

switching the oxygen concentrator to a sedentary mode when the determined change in breathing rate over the predetermined period of time is less than the predetermined threshold.

7. The method of claim 5 , wherein the predetermined threshold is a decrease of two breaths per minute.

8. The method of claim 1 , wherein the predetermined period of time is measured by a predetermined number of breaths.

9. The method of claim 8 , wherein the predetermined number of breaths is a predetermined number of successive groupings of breaths.

10. The method of claim 9 , wherein the predetermined number of successive groupings of breaths is three.

11. An oxygen concentrator comprising:

a compression system configured to generate a pressurized stream of ambient air;

a canister system comprising a canister for receiving a gas separation adsorbent, wherein the gas separation adsorbent is configured to separate at least some nitrogen from the pressurized stream of ambient air to produce oxygen enriched air;

a pressure sensor configured to measure a breath pressure of a user of the oxygen concentrator, the pressure sensor coupled to an outlet of a conduit for providing the user with the oxygen enriched air; and

one or more processors communicatively coupled to the pressure sensor, the one or more processors configured to:

detect a plurality of successive breaths using the pressure sensor;

determine a change in breathing rate over a predetermined period of time based on a comparison between breathing rates derived from successive groupings of the detected plurality of successive breaths;

adjust an inspiration breath pressure threshold based on the determined change in breathing rate over the predetermined period of time; and

compare the adjusted inspiration breath pressure threshold with a pressure signal obtained from the pressure sensor to determine when to provide the user with a bolus of the oxygen enriched air through the conduit.

12. The oxygen concentrator of claim 11 , wherein the one or more processors are configured to adjust the inspiration breath pressure threshold by:

increasing the inspiration breath pressure threshold when the determined change in breathing rate is an increase in breathing rate over the predetermined period of time; and

decreasing the inspiration breath pressure threshold when the determined change in breathing rate is a decrease in breathing rate over the predetermined period of time.

13. The oxygen concentrator of claim 12 , wherein the one or more processors are further configured to:

switch the oxygen concentrator to a sedentary mode in response to a decrease of the inspiration breath pressure threshold; and

switch the oxygen concentrator to an active mode in response to an increase of the inspiration breath pressure threshold.

14. The oxygen concentrator of claim 13 , wherein the one or more processors are further configured to set a volume of the bolus of oxygen enriched gas delivered to the user based on whether the oxygen concentrator is in the sedentary mode or the active mode.

15. The oxygen concentrator of claim 11 , wherein the predetermined period of time is measured by a predetermined number of breaths.

16. The oxygen concentrator of claim 15 , wherein the predetermined number of breaths is a predetermined number of successive groupings of breaths.

17. The oxygen concentrator of claim 16 , wherein the predetermined number of successive groupings of breaths is three.