Systems and methods for directing fluid flow in a mattress

1. A person support system comprising:

a mattress comprising a base support layer and at least one insert support layer, said base support layer configured to spatially locate said insert support layer,

wherein said insert support layer includes a first arcuate boundary on a right side of said mattress and a second arcuate boundary on a left side of said mattress such that said first and second arcuate boundaries converge toward each other as the distance from a foot end of said mattress increases to a throat,

wherein said mattress comprises a conduit, said conduit is an open space between said first and second arcuate boundaries and defines a flowpath to allow fluid flow through said conduit.

2. The system of claim 1 including a frame which supports the mattress.

3. The system of claim 2 wherein the flowpath includes a second section positioned between the head end of the mattress and the throat, the second section including boundaries which converge toward each other with increasing distance from a head end of the mattress to the throat.

4. The system of claim 3 wherein said conduit is shaped to distribute fluid flow to a target region.

5. The system of claim 4 wherein said target region coincides with a torso region of said mattress.

6. The system of claim 3 wherein the flowpath includes an inlet and a blower supplies air to the inlet, the flowpath concentrating the flow of air at the throat.

7. The system of claim 1 wherein said mattress further comprises at least one sensor configured to sense a parameter indicative of at least a portion of weight supported by said mattress.

8. The system of claim 7 further comprising a controller configured to receive a signal from said at least one sensor and control at least one characteristic of said fluid flow through said conduit.

9. The system of claim 8 wherein said controller is configured to control flow rate of said fluid through said conduit.

10. The system of claim 8 wherein the conduit comprises more than one passage and the controller is configured to adapt the distribution of airflow among the passages.

11. The system of claim 7 wherein said conduit comprises more than one passage and said controller is configured to differentially control at least one characteristic of said fluid flow through each passage.

12. The system of claim 1 comprising multiple insert support layers, wherein at least one insert support layer is configured to nest with respect to at least one other insert support layer.

13. The system of claim 1 comprising multiple insert support layers, wherein said at least one insert support layer is configured to nest with respect to said base support layer.

14. The system of claim 1 wherein said at least one insert support layer comprises nonuniformly sized openings across a section of said at least one insert support layer, said differently sized openings forming fluid flow passages.

15. The system of claim 1 wherein said at least one insert support layer comprises a nonuniform distribution of openings across a section of said at least one insert support layer, said openings forming fluid flow passages.

16. The system of claim 1 including:

a fluid supply configured to supply fluid through said conduit; and

a controller configured to supply a control signal to said fluid supply to meter fluid flow through said conduit.

17. The system of claim 1 wherein said conduit extends predominantly longitudinally through said mattress.

18. The system of claim 1 wherein said conduit extends predominantly laterally through the mattress.

19. The system of claim 1 wherein the flowpath includes a second section positioned between the head end of the mattress and the throat, the second section including boundaries which converge toward each other with increasing distance from a head end of the mattress to the throat.

20. The system of claim 19 wherein the flowpath includes an inlet and a blower supplies air to the inlet, the flowpath concentrating the flow of air at the throat.