Appeal No. 1997-0926
Application No. 08/552,045
(col. 1, lines 37-43 and col. 1, line 55 through col. 2, line
6). The resin solution reacts at room temperature with
atmospheric moisture and is crosslinked to form gel-like
layers on each of the sheets. The sheets are then superposed
and heat-sealed around the peripheral portions of the sheets
to provide a medical bag. Where the plastic sheets are made
of polyvinyl chloride, the gel-like coatings also prevent
elution of plasticizer from the sheets to the blood stored in
the bag (col. 6, lines 58-60).
Valentine discloses that a suitable blood bag system can
be made using vitamin E in combination with a flexible plastic
material essentially free of blood extractables, such as
plasticizers, found in conventional blood bags made of
polyvinylchloride (PVC) (col. 1, lines 5-23 and 59-62).
According to Valentine,
[t]he vitamin E can be incorporated in concentrated form
or added as solution in a suitable solvent, e.g. alcohol,
at the desired concentration to the blood bag or at least
one
compartment thereof. It is also contemplated that
the vitamin E can be incorporated into the plastic
material directly, using conventional techniques, so
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