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Microencapsulation and Artificial Cells (Paperback, Softcover reprint of the original 1st ed. 1984)
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Microencapsulation and Artificial Cells (Paperback, Softcover reprint of the original 1st ed. 1984)
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Early studies by Pendleton and West (1) in 1932 demonstrated that
urea moved from the blood into the small intestine in uremic dogs.
In 1946, Twiss and Kolff (2) showed in uremic patients that urea
could be removed when an isotonic solution was perfused through an
isolated in- testinalloop. Since these early studies had
demonstrated the presence of urea and its removal from the
gastrointestinal tract, Yatzidis (3) in 1964 investigated the use
of activated charcoal for the removal of uremic wastes from the
intestinal tract. In addition to Yatzidis' studies with char- coal,
other investigations with charcoal have been unable to confirm any
significant reduction in serum levels of urea, creatinine, uric
acid, or guanidines (4,5) via this approach. At the same time that
Yatzidis proposed the use of charcoal for re- moval of nitrogenous
wastes from the intestinal tract, he also proposed using charcoal
in a hemoperfusion microapparatus as an effective artifi- cial
kidney. However, clinical studies performed with the Yatzidis char-
coal artificial kidney showed an adverse affect on platelets and
the re- lease of embolizing particles (6,7). To overcome these
platelet and emboli problems, Chang's group (8) proposed the
general idea of "artificial cells," Le., microcapsules con- taining
adsorbents. Since the charcoal particles were now encased within
blood compatible membranes, they could not leave the microcapsules
to cause embolism, and platelets did not now come in direct contact
with the charcoal. In their early clinical hemoperfusion studies,
Chang et al.
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