Appeal No. 96-0881
Application No. 07/795,908
an alkalizing salt. For example, a bicarbonate dialysate is
typically formed by sequentially volumetrically proportioning
two concentrates and water into a single solution by first
mixing an acid concentrate with water to form a first mixed
solution and then adding a bicarbonate concentrate to the
first solution. Appellants explain that such prior art
"Bicarbonate and Acidified concentrates" are available in many
different concentrations to allow a dialysate solution to be
tailored for an individual patient, and that such solutions
are designated by the final concentrations of the chemicals
based on nominal proportioning ratios (specification, page 2,
lines 15-21). In some prior art cases, it is desirable that
the final "Sodium and Bicarbonate" concentrations differ
form the nominal values and to achieve this result, the
volumetric mixing ratios are varied from the nominal values . 2
Appellants acknowledge that prior art servo-
proportioning/feedback control systems have been utilized
2The nominal volumetric proportioning ratio for water to
"Acidified concentrate" is 34:1 while the the nominal
volumetric proportioning ratio for "Water/Acidified" solution
to "Bicarbonate concentrate" is 19.13:1.
4
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Last modified: November 3, 2007