Interference No. 103,197
fiber versus about 270 nW for a straight fiber. A second test
shows about 18 nW for a twisted fiber versus about 210 nW for
a straight fiber.
Finally, in the summer of 1989, testing of probes Mayall made
with a dual spiral configuration and others he made with a
single coil containing a fiber and a center cannula containing
a fiber showed that their performance was "marginal" and that
it was necessary to increase the overall optical efficiency,
which was accomplished by switching to two designs having the
LEDs directly on the face of the probe tip. In one design,97
light was collected by an optical fiber in a coiled needle
(see MX 12, page 1); in the other, light was collected by an
optical fiber in a central cannula (MX 13, page 1). It is the
latter design that Buschmann concedes was actually reduced to
practice on September 19, 1989.98
In view of the above, we hold that Morrison failed to
demonstrate that the February 1988 test apparatus delivered
enough light to the tissue site to result in a valid oxygen
saturation reading. As a result, the February 1988 tests
Mayall, MR 141-42, ¶ 12.97
B.Br. 43.98
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