| 摘要 |
A controllably inflatable cushion that includes a number of independently inflatable rows or zones of cells. Each row or zone is connected to the pressure port of a corresponding three-way valve, and the intake ports of the valves are connected to a pump. The pump and valves are controlled by a microprocessor control means which receives input from a pressure sensor and input switches. The input switches allow the user to set desired inflation sequences of the rows or zones and pressures at which the cushion is to be inflated. The pressure sensor provides feedback signals to control inflation pressure. The microprocessor also actuates light-emitting diodes or other indicator means to let the user know when the device is on, when the pump or any valve is actuated, or when the battery in the power supply is low. The exhaust ports of the valves are advantageously connected to an aeration manifold formed of perforated tubing and located in the cushion which supplies fresh air to spaces between the cells in order to make the cushion more comfortable and to reduce heat, friction and possibility of blister or decubitus ulcer development.
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