Removable cartridge for oxygen concentrator

1. A portable oxygen concentrator, comprising:

a separation cartridge selectively removable from a receptacle by movement relative to the receptacle in a first direction, the separation cartridge comprising an inlet oriented in a second direction opposite the first direction, an outlet oriented in the second direction, and a bed of adsorbent material configured to preferentially adsorb nitrogen;

wherein a first line extending parallel to the first and second directions passes through the outlet,

wherein a second line spaced-apart from the first line and extending parallel to the first line passes through the inlet, and

wherein the separation cartridge is configured such that, when fluid flows through the separation cartridge, fluid flowing along the first line contacts the adsorbent material of the bed and fluid flowing along the second line does not contact the adsorbent material of the bed.

2. The portable oxygen concentrator as recited in claim 1 , wherein:

the outlet is arranged adjacent a first end of the bed, and

adjacent a second end of the bed opposite the first end, the separation cartridge includes a spring configured to hold the bed in place.

3. The portable oxygen concentrator as recited in claim 2 , wherein:

adjacent the second end of the bed, the separation cartridge includes a porous filter, and

the spring contacts the second end of the bed via the porous filter.

4. The portable oxygen concentrator as recited in claim 1 , further comprising:

a power pack removable from the portable oxygen concentrator;

a pump electrically coupled to the power pack, the pump operable to cause a flow of fluid to move relative to the bed of adsorbent material;

a user interface configured to allow a patient to adjust and monitor operation of the portable oxygen concentrator; and

a carrying device for transporting the portable oxygen concentrator.

5. The portable oxygen concentrator as recited in claim 1 , wherein the bed comprises a bed of zeolite which provides preferential adsorption of nitrogen.

6. The portable oxygen concentrator as recited in claim 5 , wherein the zeolite is an LiLSX adsorbent.

7. The portable oxygen concentrator as recited in claim 1 , wherein the first and second lines are straight lines.

8. The portable oxygen concentrator as recited in claim 1 , wherein the separation cartridge is configured such that, when fluid flows through the separation cartridge, fluid flows along the first line in the second direction and fluid flows along the second line in the first direction.

9. The portable oxygen concentrator as recited in claim 1 , wherein the separation cartridge includes at least one additional outlet oriented in the second direction and spaced-apart from the second line.

10. The portable oxygen concentrator as recited in claim 1 , wherein the first line intersects adsorbent material of the bed and the second line does not intersect adsorbent material of the bed.

11. The portable oxygen concentrator as recited in claim 1 , wherein the inlet is configured to receive ambient air and the outlet is configured to expel product gas.

12. A separation cartridge for a portable oxygen concentrator, comprising:

an inlet oriented in a direction;

an outlet oriented in the direction;

a bed of adsorbent material configured to preferentially adsorb nitrogen; and

wherein a first line extending parallel to the direction passes through the outlet,

wherein a second line spaced-apart from the first line and extending parallel to the first line passes through the inlet, and

wherein the separation cartridge is configured such that, when fluid flows through the separation cartridge, fluid flowing along the first line contacts the adsorbent material of the bed and fluid flowing along the second line does not contact the adsorbent material of the bed.

13. A portable oxygen concentrator, comprising:

a first bed of adsorbent material configured to preferentially adsorb nitrogen;

a first inlet oriented in a direction, wherein the first inlet is configured to direct a flow of ambient air to the first bed;

a first outlet oriented in the direction, wherein the first outlet is configured to expel product gas flowing downstream of the first bed;

a second bed of adsorbent material configured to preferentially adsorb nitrogen;

a second inlet oriented in the direction, wherein the second inlet is configured to direct a flow of ambient air to the second bed;

a second outlet oriented in the direction, wherein the second outlet is configured to expel product gas flowing downstream of the second bed;

a power pack removable from the portable oxygen concentrator;

a pump electrically coupled to the power pack, the pump operable to cause a flow of fluid to move relative to the first and second beds of adsorbent material;

a user interface configured to allow a patient to adjust and monitor operation of the portable oxygen concentrator;

a carrying device for transporting the portable oxygen concentrator;

wherein a first line extending parallel to the direction passes through the first outlet,

wherein a second line spaced-apart from the first line and extending parallel to the first line passes through the first inlet,

wherein the portable oxygen concentrator is configured such that, during use, fluid flowing along the first line contacts the adsorbent material of the first bed and fluid flowing along the second line does not contact the adsorbent material of the first bed,

wherein a third line extending parallel to the direction passes through the second outlet,

wherein a fourth line spaced-apart from the third line and extending parallel to the third line passes through the second inlet, and

wherein the portable oxygen concentrator is configured such that, during use, fluid flowing along the third line contacts the adsorbent material of the second bed and fluid flowing along the fourth line does not contact the adsorbent material of the second bed.

14. The portable oxygen concentrator as recited in claim 13 , wherein the portable oxygen concentrator is configured such that, during use:

fluid flows along the first line in the direction,

fluid flows along the second line opposite the direction,

fluid flows along the third line in the direction, and

fluid flows along the fourth line opposite the direction.

15. The portable oxygen concentrator as recited in claim 14 , wherein:

the first outlet is arranged adjacent a first end of the first bed,

a first spring is arranged adjacent a second end of the first bed opposite the first end,

the first spring is configured to hold the first bed in place,

the second outlet is arranged adjacent a first end of the second bed,

a second spring is arranged adjacent a second end of the second bed opposite the first end, and

the second spring is configured to hold the second bed in place.

16. The portable oxygen concentrator as recited in claim 13 , wherein the first and second beds are contained within a common separation cartridge.