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Optical displacement sensor for infusion devices

  • US 9,950,110 B2
  • Filed: 10/07/2013
  • Issued: 04/24/2018
  • Est. Priority Date: 07/24/2002
  • Status: Expired due to Term
First Claim
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1. A medical fluid dispensing apparatus for pumping an infusible medical fluid to the body of a patient, the medical fluid dispensing apparatus comprising:

  • a piston having a motion wherein the piston causes the infusible medical fluid to be impelled out of the medical fluid dispensing apparatus at a determined delivery rate, the piston having an encoded pattern associated therewith; and

    an optical sensor, wherein the optical sensor is configured to determine the position of the piston, relative to a fiducial position, based on the encoded pattern during delivery regardless of whether the encoded pattern associated with the piston repeats.

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