Patent ID: 8914928

Claim:
A pressure control system for an inflatable patient support, the system including: a. an inflatable cell tiltable to different angular orientations; b. an angle detection valve mounted to tilt with the inflatable cell, the angle detection valve having: (1) a valve input end into which fluid is supplied; (2) a valve output end from which the fluid exits; (3) a valve element configured to move via the force of gravity from: i. a non-obstructing position wherein the valve element allows the fluid to flow through the valve output end, to ii. an obstructing position wherein the valve element at least substantially blocks the fluid from flowing through the valve output end, when the angle detection valve's angular orientation is changed from a first angle to a second angle; c. a pressure transducer configured to obtain pressure measurements dependent on the fluid pressure at the valve input end, wherein the fluid pressure in the inflatable cell is adjusted in response to the pressure measurements.