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Implantable, calibrateable measuring instrument for a body substance and a calibrating method

  • US 4,759,371 A
  • Filed: 05/01/1987
  • Issued: 07/26/1988
  • Est. Priority Date: 05/02/1986
  • Status: Expired due to Fees
First Claim
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1. An implantable measuring instrument for a body substance, comprising:

  • an implantable housing having a first recess therein covered by a semi-permeable membrane which admits a selected body substance therethrough;

    a channel in fluid communication with the volume between said recess and said membrane;

    measuring means communicating with said channel for measuring said selected body substance;

    a conveying means for circulating fluid containing said body substance along said measuring means and having an output connected to an output path;

    an expandable storage means in fluid communication with said volume between said membrane and said recess;

    a second recess in said housing in fluid communication with said measuring means; and

    a pierceable, resealable septum covering said second recess adapted for the introduction and withdrawal of a cannula therethrough.

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