Ohmeda Biox 3700 - Principles of Operation; Theory of Operation

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PRINCIPLES OF OPERATION
THEORY
thaVhemoSn °V!* T™** B±°X 37°° °Ximeter is based ™ «*• assumption
that hemoglobin exists in two principle forms in the blood:
* oxygenated (with 02 molecules loosely bound) or Hb02
* reduced (with no molecules bound) or Hb.
Arterial oxygen saturation (Sa02) is defined as the ratio of oxygenated
^TesTii .•n.ss irsr tHb°2+Hb (+ ocher "£wz-
)]
Hb02
SaO-
Hb02 + Hb (+ other forms of hemoglobin
present in arterial blood)
iVthroueh Tllvltl M6 abs0rp"on °f ••l«ct«l wavelengths of light pass
ing through a living tissue sample. Since oxygenated heraoelobin and
reduced hemoglobin absorb light as known functions of wavefengtns the
relative percentage of these two constituents, and SaO, are cflcuiated
differentiating w '" T1!""8 °XiBetry £he°r* lnt° -di^l^ev e'is
alobin and It* I ? '"! absorPtion due « oxygenated and reduced hemo
globin and the absorption due to all other tissue constituents.
The Ohmeda Biox 3700 solves this problem with a patented two waveleneth
calculations, by using the pulsatile portion of the incoming signal"
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01/27/86