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Transcutaneous measurement of substance in body tissues or fluid

  • US 6,088,087 A
  • Filed: 05/15/1998
  • Issued: 07/11/2000
  • Est. Priority Date: 11/17/1995
  • Status: Expired due to Fees
First Claim
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1. An apparatus for use in transcutaneous measurement of a substance comprising:

  • a light source for directing light towards a subject;

    a light detection means for detecting at least one selected wavelength or wavelength band; and

    an optical system, the optical system comprising;

    a focusing means for collecting and focusing divergent light emanating from the subject; and

    an optical selecting means, that is positioned, in use, relative to the said focusing means such that light from the focusing means passes through the optical selecting means, and such that light returning from a pre-selected region only of the subject is able to pass through the optical selecting means to the light detection means, the said pre-selected region of the subject being one of the following;

    (I) at a pre-selected distance beneath the surface of the subject;

    (II) pre-selected to be on the surface of the subject;

    whereby the intensity of light at the at least one selected wavelength or wavelength band returning from the selected region can be determined.

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