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Implantable sensor and system for in vivo measurement and control of fluid constituent levels

  • US 6,049,727 A
  • Filed: 04/03/1998
  • Issued: 04/11/2000
  • Est. Priority Date: 07/08/1996
  • Status: Expired due to Term
First Claim
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1. A method of determining a concentration of a constituent of body fluid in a mammal using in vivo spectroscopy, the method comprising the step of:

  • (a) implanting a sensor system in the mammal by setting the sensor system in place to allow plural measurements to be taken at different time periods from a single in vivo position, the sensor system including a source of light which emits at a plurality of different wavelengths, at least one of the wavelengths being in the infrared region, and a detector for detecting light emitted from the source, the source and the detector located so that (i) the light output from the source interacts with a body fluid before being received by the detector, and (ii) light from each of the different wavelengths has a substantially collinear optical path through the fluid with respect to one another;

    (b) emitting light from the source;

    (c) obtaining a signal at an output of the detector which contains spectra of the body fluid at each of the different wavelengths; and

    (d) analyzing the signal to determine the concentration of the constituent of the body fluid.

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