For Wound Surfaces, what is meant by Air Fluidized Therapy?

For Wound Surfaces, what is meant by Air Fluidized Therapy?
 

Air Fluidized Therapy (AFT) provides excellent pressure redistribution and moisture management for complex wounds by creating a "bead bath". An immersive enviroment is created by blowing air under a thick layer of silicone beads, giving the patient an ideal healing environment.  Hill-Rom offers AFT with the Clinitron® Rite Hite® Bed.