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Lack of patient movement monitor and method

  • US 7,557,718 B2
  • Filed: 05/02/2005
  • Issued: 07/07/2009
  • Est. Priority Date: 04/30/2004
  • Status: Active Grant
First Claim
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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.

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