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In-vivo information measurement apparatus

  • US 8,060,172 B2
  • Filed: 03/22/2005
  • Issued: 11/15/2011
  • Est. Priority Date: 03/29/2004
  • Status: Expired due to Fees
First Claim
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1. An in-vivo information measurement apparatus comprising:

  • an insertion part for insertion into a body cavity;

    a tubular cover member disposed at the outermost periphery of the insertion part;

    a plurality of transparent window portions disposed with gaps therebetween on the cover member;

    a light projection unit, provided at a tip of the insertion part, that irradiates an examination site inside the body cavity via the window portion with intensity-modulated light intensity modulated at a first frequency;

    a light receiving unit, provided at the tip of the insertion part, that receives return light from the examination site via the window portion at a different position from the light projection unit;

    an optical detector that detects return light from the examination site received at the light receiving unit;

    an in-vivo information calculation unit that calculates in-vivo information for the examination site based on a phase shift between a modulated detection signal, formed by modulating a detection signal from the optical detector at a second frequency, and a reference signal having a difference frequency equal to the difference between the first frequency and the second frequency; and

    moving mechanism that moves at least one of the light projection unit and the light receiving unit in a disposition direction of the plurality of transparent window portions.

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