Pulse spO2 Oximeter components help >.<

[Ding]

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 &amp; emitter)
2. small
3. available in HK as fast as possible (optional)
4. IR wavelength = 600 &amp; 880 nm (similiar is ok)
5. power output = 2mW/mm^2

Any one knows what electronic components can i use ? &gt;.&lt;

Thank very much for help.

 

[Ian Stirling]

Ding &lt;fdsaf@hhdks.com&gt; wrote:

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 &amp; emitter)
2. small
3. available in HK as fast as possible (optional)
4. IR wavelength = 600 &amp; 880 nm (similiar is ok)
5. power output = 2mW/mm^2

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

 

[Rich Grise]

On Tue, 02 Nov 2004 21:38:31 +0000, Ian Stirling wrote:

Ding &lt;fdsaf@hhdks.com&gt; wrote:
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 &amp; emitter)
2. small
3. available in HK as fast as possible (optional)
4. IR wavelength = 600 &amp; 880 nm (similiar is ok)
5. power output = 2mW/mm^2

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

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

 

[James Meyer]

On Tue, 2 Nov 2004 21:56:47 +0800, "Ding" &lt;fdsaf@hhdks.com&gt; wroth:

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 ?

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

 

[Jonathan Kirwan]

On Wed, 03 Nov 2004 00:42:25 GMT, James Meyer &lt;jmeyer@nowhere.net&gt; wrote:

On Tue, 2 Nov 2004 21:56:47 +0800, "Ding" &lt;fdsaf@hhdks.com&gt; wroth:

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 ?

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.

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