| 摘要 |
The patient support structure or bed comprises an articulatable frame (30) having a plurality of elongated inflatable sacks (1 to 10) thereon, the sacks being connected to a low pressure compressed air blower (104) and a plurality of pipes (100) for carrying gas from the blower to the sacks. The sacks rest atop a neoprene membrane which covers a planar upper surface (64) of the frame (30). Power to the air blower is supplied by a variable autotransformer adjustable by an electric motor mechanically connected thereto, and operation of the motor is controlled by an electronic circuit which balances the autotransformer voltage against a preset reference voltage. A multi-outlet, variable flow, gas valve comprises a housing (136) defining an inlet (140) and a passageway (138). The valve housing further defines at least two cylinder chambers (142) communicating with the passageway and a discrete outlet (144) for each cylinder chamber, and a piston (146) is substantially nonrotatably disposed inside each cylinder chamber, but is movable along the chamber (142) by a motor (160) to vary flow through the valve and to selected ones of the sacks (70). The sacks can be rapidly deflated via a plurality of solenoid valves, and the pipes from the blower can be directed to different sacks by opening and closing a plurality of manually operated valves. |
