Interference No. 103,197
optical fibers includes too many artifacts, then the
oximeter monitor will display no reading at all.
28. When measuring oxygen saturation, the oximeter
monitor waits until it identifies measurements of four to
eight legitimate pulses (heart beat pulses) resulting
from the pulsatile variations in the perfused tissue.
Once the oximeter monitor identifies a sufficient number
of legitimate pulsatile signals, then the oximeter
monitor displays a pulse (heart rate) and oxygen
saturation.
29. When I performed the tests with the invasive
fetal probe configuration, with one or both needles (with
optical fibers therein) under my skin, the oximeter
monitor connected to my probe first "beeped " multiple
times, indicating identification of legitimate pulsatile
signals before displaying an oxygen saturation and pulse
(heart rate) reading. Since the oximeter monitor
operated in the fashion it normally does when measuring
oxygen saturation, I was confident that the optical fiber
arrangement under my skin was measuring oxygen.
30. Second, about the same time I performed the
test, I also measured the oxygen saturation of my finger
using a conventional non-invasive pulse oximetry probe.
The oxygen saturation measured at my finger with a
conventional probe closely approximated the oxygen
saturation measured in my forearm with the invasive fetal
probe design. Exhibit 106 is a true and accurate copy of
a color photograph of the finger probe I used during this
testing period. [Emphasis added.]
The Morrison reply brief further argues that "[i]t is quite79
unlikely that pulse oximeter monitoring manufacturers would
let a pulse oximeter monitor be sold publicly that did not
prevent a false reading based on motion artifact (by
evaluating the signal coming in as either legitimate or not
Morr.Open.Br. 36.79
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