Patient support structure

Details Patient support structure Patient support structure

A - Human Necessities

61

G

360/1, 5/13

A61G 7/00 (2006.01) A47C 27/10 (2006.01) A61G 7/057 (2006.01)

Patent

CA 1309212

ABSTRACT OF THE DISCLOSURE An improved patient support structure comprising an articulatable frame, a plurality of elongated inflatable sacks, some of the sacks having one or two comfort slots therein, a low pressure compressed air blower and a plurality of pipes for carrying gas from the blower to the sacks. A multi-outlet, variable flow, gas valve connects the blower to the pipes and comprises a housing defining an inlet and a passageway. The valve housing further defines at least two cylinder chambers communicating with the passageway and a discrete outlet for each cylinder chamber communicating therewith. A piston is substantially non-rotatably disposed inside each cylinder chamber and has a threaded opening through the center thereof which receives a threaded portion of a rotatable shaft therethrough. One end of the shaft is rotated by a motor, and the other end of the shaft is connected to an axle of a potentiometer. The sacks rest atop a neoprene membrane which covers a planar upper surface of the frame. Operation of the motor of an exhaust valve is controlled by an electronic exhaust valve control circuit which balances the voltage from the potentiometer of the valve against a voltage output from a preset variable resistor. A zone valve control circuit similar to the exhaust valve control circuit, has a motor driven integrated circuit and a further integrated circuit which chooses between a plurality of preset step-wise thumbwheel switches based upon a signal from a step-wise linear switch which is mechanically connected to one of the articulatable sections of the frame. The sacks can be rapidly deflated via a plurality of solenoid valves. A plurality of pressure sensitive switches indicates when a substantially deflated condition exists in one or more of the sacks. A plurality of fabric panels is attached via a plurality of snap members to the ends of the sacks and to a portion of the frame.

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