Abstract
Stable nonthrombogenic microcapsules of 4 to 200 μ mean diameter consisting of a protein or detoxifying agent enclosed within thin semipermeable benzal-konium–heparin complexed polymer membranes were prepared. Such microcapsules did not cause clot formation in a nonthrombogenic extracorporeal shunt chamber when perfused for several hours by circulating blood which had normal clotting time. The enclosed enzyme retained its catalytic activity.
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