	US 7,557,718 B2
	Lack of patient movement monitor and method
Robert Petrosenko, Daniel Island, S.C. (US); David Lokhorst, Victoria (Canada); Mayur Yermaneni, Cincinnati, Ohio (US); Michael Z. Sleva, Wyoming, Ohio (US); William L. Jacques, II, Mt. Pleasant, S.C. (US); Karen Janoff, Mt. Pleasant, S.C. (US); John A. Bobey, Daniel Island, S.C. (US); Jonathan H. Mueller, Mt. Pleasant, S.C. (US); Richard B. Stacy, Daniel Island, S.C. (US); and Andrew F. Skinner, Batesville, Ind. (US)
Assigned to Hill-Rom Services, Inc., Wilmington, Del. (US)
Filed on May 02, 2005, as Appl. No. 11/119,635.
Claims priority of provisional application 60/567215, filed on Apr. 30, 2004.
Claims priority of provisional application 60/665241, filed on Mar. 25, 2005.
Claims priority of provisional application 60/665141, filed on Mar. 25, 2005.
Claims priority of provisional application 60/636252, filed on Dec. 15, 2004.
Claims priority of provisional application 60/608013, filed on Sep. 08, 2004.
Prior Publication US 2005/0273940 A1, Dec. 15, 2005
Int. Cl. G08B 21/00 (2006.01); A61B 5/08 (2006.01)

U.S. Cl. 340—573.1 [340/665; 340/666; 5/615; 600/534]

21 Claims

1. In a pressure adjustable support, including a bladder assembly having a plurality of bladders to support a patient, a plurality of sensors, each of the plurality of sensors subtending at least one of the bladders to sense a force transmitted through the bladders, a method comprising the steps of:

setting a time period for determining an activity level;

setting a threshold level with respect to the sensed force;

sampling the forces sensed by each of the plurality of sensors transmitted through the bladders;

filtering the sampled forces to determine a high frequency component;

determining which of the filtered sampled forces exceed the set threshold level;

determining the number of filtered sampled forces determined to cross the threshold level; and

generating a signal as a function of the set time period, the set threshold level, and the sampled forces.