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Blood glucose monitoring system

  • US 5,743,262 A
  • Filed: 06/07/1995
  • Issued: 04/28/1998
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A system for noninvasively monitoring blood glucose concentration within the bloodstream of a subject, said system comprising:

  • a light source which emits light radiation at a plurality of wavelengths;

    a receptacle for receiving a fleshy medium carrying blood of said subject;

    an optical detector positioned to receive light radiation from said light source which has passed through and been attenuated by said fleshy medium and said blood, said optical detector responsive to the attenuated light radiation to generate an output signal indicative of the intensity of said light radiation after attenuation by said fleshy medium and said blood; and

    a signal processor coupled to said detector to receive said output signal, said signal processor responsive to said output signal to isolate portions of said output signal due to optical characteristics of said fleshy medium from portions of said output signal reflecting the optical characteristics of said blood, said signal processor providing a set of frequency response values reflecting the optical characteristics of said blood;

    a linearization module executable by said signal processor to linearize said set of frequency response values; and

    a glucose concentration determination module executable by said signal processor to determine the concentration of glucose within said patient'"'"'s bloodstream based upon the linearized frequency response values.

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