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Pulse spO2 Oximeter components help >.<

Discussion in 'Electronic Design' started by Ding, Nov 2, 2004.

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  1. Ding

    Ding Guest

    Hi all

    i wanna build a Pulse Oximeter to measure oxygen supply of brain
    (similiar to that of MRI)
    http://www.acad.polyu.edu.hk/~02471629d/nir.pdf

    I wanna build a ciruit for it. But what Pulse Oximeter components
    should i use ?

    My requirement is that:
    1. cheap (around US$125, max. US$250 for sensor & emitter)
    2. small
    3. available in HK as fast as possible (optional)
    4. IR wavelength = 600 & 880 nm (similiar is ok)
    5. power output = 2mW/mm^2

    Any one knows what electronic components can i use ? >.<

    Thank very much for help.
     
  2. Ian Stirling

    Ian Stirling Guest

    There may be a cheaper way.
    Cut off the head rapidly, and measure the rate of blood coming out.
     
  3. Rich Grise

    Rich Grise Guest

    Oh, my suggestion was much less drastic - just a small hole in the
    skull, and a small probe. Of course, you still have the problem of
    the sensor chemistry, but I'm almost sure I've seen sensors that
    can read out O2 concentration.

    Cheers!
    Rich
     
  4. James Meyer

    James Meyer Guest

    You won't measure oxygen supply to the brain with a pulse oximeter.
    What you will measure if you apply a simple oximeter anywhere on the body is the
    saturation level of the blood in the capillaries in the skin where the sensor is
    applied.

    Jim
     
  5. My first reaction to reading this is "How can this person possibly consider an
    MRI as being in any way similar to a pulse oximeter??" They aren't even in the
    same ballpark. More was that even if it were like an MRI, the idea of
    superconducting magnet systems at home seemed vastly out of place.

    In looking over the indicated article (first part of it), it appears that they
    are talking about something similar to the pulse oximeters. It uses 880nm and
    700nm LEDs, an APD, and lock-in amps, and claims to observe oxygen use in the
    brain, through the skull. Whether any of this really makes sense, I've no idea.
    But I think this is what the OP is asking about. (I think they are measuring
    "something," but what it is I've no idea. Could be responses in the scalp's
    blood flow, for all I know about it.)

    Jon
     
  6. James Meyer

    James Meyer Guest

    I failed to look at the referenced web site when I made my reply.
    Included was this, "Since this technique was first reported in 1977 (Jobsis
    1977), various studies have examined brain activity........"

    I was working for Dr. Jobsis at Duke University while he was developing
    the technique. His technique uses some of the same characteristics of
    oxygenated versus reduced hemoglobin that pulse oximeters use, but it is applied
    differently and returns absolute ratios of the two components rather than oxygen
    saturation.

    The volume of tissue in the brain that is measured is rather large and I
    question whether any information that would be of use in a "brain-machine"
    interface could be derived from its use.

    Jim
     
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