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Long-term implantable monitoring system and methods of use

  • US 9,814,413 B2
  • Filed: 07/24/2015
  • Issued: 11/14/2017
  • Est. Priority Date: 07/24/2014
  • Status: Active Grant
First Claim
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1. A method of measuring a level of analyte in body fluid, comprising:

  • implanting a monitoring system into a body of a patient, the implanted monitoring system having a first multi-layer porous membrane, a second multi-layer porous membrane, and a sensor, the monitoring system further comprising a catheter, the first multi-layer porous membrane forming a wall of the catheter;

    creating an ultra-filtrate from a body fluid by imparting a pressure differential to filter a portion of the body fluid through the first multi-layer porous membrane of the implanted monitoring system, the first multi-layer porous membrane having an outer layer and an inner layer, the outer layer having larger pores than the inner layer;

    measuring an amount of analyte in the ultra-filtrate with the sensor of the implanted monitoring system; and

    returning the ultra-filtrate to the body fluid through the second multi-layer porous membrane.

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