Abstract: A low air loss bed has a microprocessor for simultaneously controlling the supply and exhaust valves of individual bed sections. Air is supplied from a blower to a valve assembly which comprises an inlet valve and an exhaust valve. The inlet valve is linked to the exhaust valve so that opening of the inlet valve is automatically accompanied by a corresponding degree of closure of the exhaust valve, and vice-versa.

Abstract: The present invention provides a therapeutic bed which comprises:(a) a trolley frame (1) having floor-engaging feet or wheels (2),(b) an attitude frame (3) pivotably mounted on the trolley frame so as to be pivotable through a predetermined arc about an axis extending longitudinally of the bed,(c) operating means (62, 67 & 64) for causing the attitude frame to pivot in one direction and then the other through said predetermined arc,(d) a plurality of air sacs (14) supported on said attitude frame and inflatable to a pressure sufficient to provide a resilient surface for supporting a patient thereon, said air sacs together forming a shaped cavity (31, 32, 33) within which the patient's body can be nested and supported so that the patient does not slide off the bed during turning, and(e) microprocessor control means for causing the turning movement of the attitude frame to be arrested when reaching the end of the predetermined movement in one direction and causing the operating means to reverse the direction of