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Motion sensor

  • US 5,523,742 A
  • Filed: 05/18/1995
  • Issued: 06/04/1996
  • Est. Priority Date: 11/18/1993
  • Status: Expired due to Fees
First Claim
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1. A device for attachment to a human patient for automatically monitoring said patient for occurence of an attack resulting from the medical condition of status epilepticus, wherein even barely perceptible shaking movements of the patient in any direction, or at any angle, may be sensed, and the number of such movements are being monitored, said device comprising:

  • an electrically conductive hollow cylinder means, capped at each end respectively by an electrically conductive circular plate which is electrically insulated from said cylinder means, whereby said plates and said cylinder means are connected through an electronic circuit means to a direct current voltage source such that both plates are of the same polarity but opposite to the the polarity of said cylinder means, an electrically conductive ball placed within said cylinder being free to roll, said ball being able to establish a closed electrical path at either end of the cylinder means through contacting the interior surface of either one of said end circular plates while also contacting the interior surface of said cylinder means, whereby changes in electrical resistance over a multitude of contacted points of the interior surfaces of the cylinder means and of the circular plate contacted are detected in said electronic circuit means as a series of electrical current makes and breaks, and as changes in the level of electrical current flow through said electronic circuit means as the ball moves while making such closed electrical path, through even slight movements of said ball caused by patient movement.

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