Patent ID: 8910331

Claim:
A cushion for preventing pressure sore, comprising: an air cell layer, having a plurality of air cells and being divided into at least four air cell zones, air cells in each air cell zone being in communication with each other, but air cells in any two adjacent air cell zones being not in communication with each other; an air passage layer, located under the air cell layer and having a plurality of air passages therein, each air passage being connected to and in communication with at least one of the air cell zones; a base layer, the air passage layer and the air cell layer being disposed on the base layer; and a plurality of air ducts, an end of each air duct being in communication with a corresponding air passage, and the other end extending out of the cushion and being provided with a joint, and each air duct having a respective valve; wherein the number of the air passages is less than the number of the air cell zones, and wherein the air cells in the air cell layer are organized into an A air cell zone, a B air cell zone, a C air cell zone, a D air cell zone, and an E air cell zone as arranged in an array below; the air passage layer has a first air passage, a second air passage, and a third air passage therein; the first air passage is in connection and communication with the A air cell zone and the C air cell zone, the second air passage is in connection and communication with the B air cell zone and the D air cell zone, and the third air passage is in connection and communication with the E air cell zone; the array is shown as follows: [ E E E E E E E E E E E E E E E E E E E E A A A A A B B B B B A A A A A B B B B B A A A A A B B B B B A A A A A B B B B B D D D D D C C C C C D D D D D C C C C C D D D D D C C C C C D D D D D C C C C C ] .