Importance

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Abstract

A sanitary preparation apparatus having a vertically disposed tube, a port coupled to the tube for loading materials, and an end piece coupled to and sealing the bottom end of the tube is disclosed. A slidable platen having substantially the size and shape of the cross section of the tube is provided to close the mixing volume against contamination and to force the prepared material through a sealable connector coupled to the end piece. The platen has a passageway allowing a mixing mechanism including a shaft with attached impeller to be introduced into the mixing volume. One embodiment provides a second volume above the platen in which positive and negative gas pressures can be applied to move the platen within the tube. A method is disclosed for using the sanitary preparation apparatus to prepare a 4% cross-linked polyacrylamide (CPAM) hydrogel and to dispense the gel under pressure.

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First Claim