Multi-chambered sequentially pressurized air mattress with four layers

An air mattress assembly for use by a patient to maximize comfort and minimize the likelihood of bed sores thereon, by a varying pressure within the mattress, the assembly comprising:

• a pair of variably pressurized uppermost dynamic layers of interdigitated cells, said layers joined together at their respective transverse end edges, by a web of flexible plastic, to prevent relative movement therebetween;
• a pair of constantly pressurized lowermost static layers of interdigitated cell, said layers joined together at their respective transverse edges, by a web of flexible plastic;
• wherein said dynamic layers of cells and said static layers of cells each have a head end, and said head end of said dynamic layers and said head end of said static layers have a web of flexible plastic material joining them together to prevent relative movement of said dynamic layers with respect to said static layers;
• an arrangement of fluid conduits for conducting alternating or constant fluid pressure levels to adjacent interdigitated cells;
• and
• a pressure generator for providing both varying cycles of fluid pressure to said cells in said two uppermost layers of cells and a constant level of fluid pressure in said two lowermost layers of cells, whereby a wave-like sequential pressurization-depressurization takes place in said uppermost two layers, and a constant pressure is maintained in said two lower layers providing a stable base thereunder.