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Optical displacement sensor for infusion devices

  • US 7,498,563 B2
  • Filed: 07/23/2003
  • Issued: 03/03/2009
  • Est. Priority Date: 07/24/2002
  • Status: Expired due to Fees
First Claim
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1. A displacement sensor for a medical fluid pump having a reservoir and a translating piston, the sensor comprising:

  • a. a plunger rod coupled to the piston bearing an encoded pattern of encoding features, wherein the encoding features includes a plurality of slots, the spacing of the encoding features from one another defining spaces between such that any two adjacent spaces form a unique sequence;

    b. a light source for illuminating the encoded pattern;

    c. a detector array for detecting light from the illuminated encoded pattern and generating a detector signal, said detector array configured to detect at least two of said plurality of slots simultaneously; and

    d. a processor for determining a displacement of the plunger rod relative to a fiducial reference position based at least on the detector signal.

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