Appeal No. 2004-0479
Application No. 09/780,864
normal lighting conditions." See Cambron, column 6, lines 17-28.
4. Cambron states in the specification that "[i]t is generally
desirable that catheters be radiopaque because it is often
necessary to determine the precise location of a catheter
within its host by X-ray examination." See Cambron, column 1,
lines 11-14.
5. Cambron states in the specification that "[i]n U.S. Patent
Nos. 3,749,134 and 3,901,829, Slingluff describes yet further
attempts to produce catheters which are optical transparent
and radiopaque. In these patents, Slingluff suggests blending
a small amount of a diol of tetrabromophthalic anhydrite and a
plasticizer with the thermoplastic resin employed in forming
the catheter." See Cambron, column 2, lines 26-32.
6. Cambron states in the specification that "[u]nfortunately,
it has been discovered that such physical blends suffer from
certain drawbacks. For example, the material blended in to
add radiopaque often can be leached from the material. In
extreme cases, the material can be leached from the catheter
and absorbed systematically by the host." See Cambron, column
2, lines 56-61.
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