Portable oxygen concentrator retrofit system and method

1. A method of retrofitting an existing portable oxygen concentrator for use in a patient ventilation system, the existing portable oxygen concentrator having at least one compressor, one or more sieve beds downstream of the compressor, an existing product tank downstream of the sieve beds, the existing product tank having an internal capacity of less than 300 ml, and a downstream gas path in fluid communication with the existing product tank, the downstream gas path having at least one pressure regulator integrated therein, the method comprising:

replacing or supplementing the existing product tank to define a retrofit set of one or more product tanks, the retrofit set of one or more product tanks including either i) the existing product tank and one or more supplemental product tanks or ii) one or more replacement product tanks, the aggregate internal capacity of the retrofit set of one or more product tanks being 300 ml or more; and

placing a ventilation gas path in fluid communication with the downstream gas path at a location upstream from the at least one pressure regulator such that gas flowing from the retrofit set of one or more product tanks flows to the ventilation gas path without flowing through the at least one pressure regulator.

2. The method of claim 1 , wherein said configuring includes removing the at least one pressure regulator.

3. The method of claim 1 , wherein the downstream gas path has at least one filter integrated therein.

4. The method of claim 3 , wherein the location is upstream from the at least one filter such that the gas flowing from the retrofit set of one or more product tanks flows to the ventilation gas path without flowing through the at least one filter.

5. The method of claim 3 , wherein said configuring includes removing the at least one filter.

6. The method of claim 1 , wherein the downstream gas path has at least one flow valve integrated therein.

7. The method of claim 6 , wherein the location is upstream from the at least one flow valve such that the gas flowing from the retrofit set of one or more product tanks flows to the ventilation gas path without flowing through the at least one flow valve.

8. A method of retrofitting an existing portable oxygen concentrator for use in a patient ventilation system, the existing portable oxygen concentrator having at least one compressor, one or more sieve beds downstream of the compressor, an existing product tank downstream of the sieve beds, the existing product tank having an internal capacity of less than 300 ml, and a downstream gas path in fluid communication with the existing product tank, the downstream gas path having at least one pressure regulator integrated therein, the method comprising:

replacing or supplementing the existing product tank to define a retrofit set of one or more product tanks, the retrofit set of one or more product tanks including either i) the existing product tank and one or more supplemental product tanks or ii) one or more replacement product tanks, the aggregate internal capacity of the retrofit set of one or more product tanks being 300 ml or more;

placing a ventilation gas path in fluid communication with the retrofit set of one or more product tanks; and

configuring the portable oxygen concentrator such that all of the gas flowing from the retrofit set of one or more product tanks flows to the ventilation gas path and none flows through the at least one pressure regulator,

wherein the downstream gas path has at least one flow valve integrated therein and the portable oxygen concentrator is configured such that none of the gas flowing from the retrofit set of one or more product tanks flows through the at least one flow valve.

9. The method of claim 8 , wherein said configuring includes placing the ventilation gas path in fluid communication with the downstream gas path at a location upstream from the at least one pressure regulator and the at least one flow valve and diverting all of the gas flowing into the downstream gas path to the ventilation gas path.

10. The method of claim 8 , wherein said configuring includes removing the at least one flow valve.

11. The method of claim 10 , wherein said configuring includes removing the at least one pressure regulator.

12. The method of claim 1 , wherein the ventilation gas path comprises a pressure sensor.

13. The method of claim 1 , wherein the existing portable oxygen concentrator comprises an existing external housing, and wherein following performance of the method, no portion of the retrofit set of one or more product tanks is outside of the existing external housing.

14. The method of claim 1 , wherein the aggregate internal capacity of the retrofit set of one or more product tanks is 500 ml or more.

15. A method of retrofitting an existing portable oxygen concentrator for use in a patient ventilation system, the existing portable oxygen concentrator having at least one compressor, one or more sieve beds downstream of the compressor, an existing product tank downstream of the sieve beds, the existing product tank having an internal capacity of less than 300 ml, and a downstream gas path in fluid communication with the existing product tank, the downstream gas path having at least one pressure regulator integrated therein, the method comprising:

replacing the existing product tank with one or more replacement product tanks, the aggregate internal capacity of the one or more replacement product tanks being 300 ml or more; and

placing a ventilation gas path in fluid communication with the downstream gas path at a location upstream from the at least one pressure regulator such that gas flowing from the one or more replacement product tanks flows to the ventilation gas path without flowing through the at least one pressure regulator.

16. The method of claim 15 , wherein the one or more replacement product tanks includes an enlarged product tank having an internal capacity of 300 ml or more.

17. The method of claim 15 , wherein the aggregate internal capacity of the one or more replacement product tanks is 500 ml or more.

18. A method of retrofitting an existing portable oxygen concentrator for use in a patient ventilation system, the existing portable oxygen concentrator having at least one compressor, one or more sieve beds downstream of the compressor, an existing product tank downstream of the sieve beds, the existing product tank having an internal capacity of less than 300 ml, and a downstream gas path in fluid communication with the existing product tank, the downstream gas path having at least one pressure regulator integrated therein, the method comprising:

supplementing the existing product tank with one or more supplemental product tanks, the aggregate internal capacity of the existing product tank and the one or more supplemental product tanks being 300 ml or more; and

placing a ventilation gas path in fluid communication with the downstream gas path at a location upstream from the at least one pressure regulator such that gas flowing from the existing product tank and the one or more supplemental product tanks flows to the ventilation gas path without flowing through the at least one pressure regulator.

19. The method of claim 18 , wherein the aggregate internal capacity of the existing product tank and the one or more supplemental product tanks is 500 ml or more.