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Wheelchair alarm system and method

  • US 8,203,454 B2
  • Filed: 03/02/2009
  • Issued: 06/19/2012
  • Est. Priority Date: 03/03/2008
  • Status: Active Grant
First Claim
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1. A method for preventing a person from falling from a chair, comprising the steps of:

  • sensing a plurality of seating position parameters with a plurality of sensors located on the chair;

    determining at least one gesture state from the plurality of seating position parameters;

    determining whether the at least one gesture state indicates or predicts a risk condition;

    providing an alarm when the risk condition is indicated or predicted by a processor; and

    wherein the step of determining the at least one gesture state from the plurality of seating position parameters comprises;

    deriving a plurality of derived features from the seating position parameters;

    determining from at least one of the plurality of derived features a probabilistic score for the at least one gesture state; and

    triggering the at least one gesture state when the probabilistic score is above a threshold score.

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