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Arthrometer with gravity switches and adjustable limit signaling

  • US 5,586,559 A
  • Filed: 03/06/1995
  • Issued: 12/24/1996
  • Est. Priority Date: 12/17/1992
  • Status: Expired due to Fees
First Claim
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1. An arthrometer assembly for monitoring an angle of flexure of an elongated body limb relative to the portion of the body to which the limb is attached, the assembly comprising:

  • A. a rigid housing extending along a principal axis, and including;

    i. a first gravity-activated switch having an associated first switch axis, said first switch having at least two states and being responsive to its spatial orientation whereby said first switch changes between its first and second states when a first switch axis angle changes between a value greater than a first predetermined switch angle and a value less than said first predetermined switch angle, said first switch axis angle being the angle of said first switch axis measured with respect to a vertical axis,ii. first vernier means for adjustably controlling the orientation of said first switch axis with respect to said principal axis with a sensitivity reduction greater than 1;

    1,iii. means for selecting said first predetermined switch angle, andiv. means for generating a signal representative of changes in state of said first switch;

    B. means for coupling said housing to the limb so that said principle axis is at a fixed orientation with respect to the limb.

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