Method of controlling a pressurized mattress system for a support structure

摘要

A method for automatically varying the internal air pressure in at least one inflatable air bladder associated with at least one zone of a pressurized mattress system to achieve an optimal zone air pressure for a patient. The method includes a step of incrementally decreasing the zone air pressure of the at least one zone until more than a predetermined percentage or portion of the patient is directly supported by a substrate disposed below the at least one inflatable air bladder. The method then determines the appropriate increase in zone air pressure to achieve the optimal zone air pressure for the patient.

主权项

1. A method for controlling a pressurized mattress system, said pressurized mattress system having an upper surface for receiving a patient thereon, said pressurized mattress system including:
at least one zone having at least one inflatable air bladder, a substrate disposed below said at least one inflatable air bladder, a pressure sensor for measuring a zone air pressure of said at least one zone, a plurality of interface pressure sensors disposed on an upper surface of said at least one inflatable air bladder, each of said plurality of interface pressure sensors measuring an interface pressure at a discrete location along said upper surface of said at least one inflatable air bladder, a source of pressurized air, and a controller for receiving signals from said pressure sensor and said plurality of interface pressure sensors and for controlling the flow of pressurized air to/from said at least one inflatable air bladder based on said signals, wherein said controller calculates a zone interface pressure for said at least one zone based on said signals from said plurality of interface pressure sensors, said method comprising the steps of:
a) inflating said at least one inflatable air bladder to an initial zone air pressure;b) reducing the zone air pressure by a predetermined first value and calculating a zone interface pressure;c) repeating step b) until the zone interface pressure meets a predetermined criterion and storing said zone air pressure as a bottoming point zone air pressure; andd) pressurizing the at least one zone to an optimal zone air pressure based on said bottoming point zone air pressure wherein said step d) of pressurizing the at least one zone to an optimal zone air pressure includes the steps of:
1) calculating an associated zone interface pressure when said bottoming point zone air pressure is increased by said predetermined first value;2) calculating an associated zone interface pressure when said bottoming point zone air pressure is increased by said predetermined second value; and3) inflating said at least one zone to the zone air pressure associated with the lower zone interface pressure from steps 1 and 2.