Abstract: The Specification discloses an improved peristaltic Roller Pump for pumping fluids through a flexible tubing. First and second surge release radii are formed on a semicylindrical reaction wall to minimize back surge or fluctuations in pump line pressure as the pump rollers engage and disengage the reaction wall. Improved sloped or angles sweep vanes are provided in front of each roller for collecting the tubing and directing it through a discharge throat into the path of the oncoming roller thereby minimize jamming, kinking or other entanglement of small diameter tubing when used in a roller pump. A novel and inexpensive construction arrangement provides for quick simple and precise adjustment of both rollers simultaneously to enable the operator to quickly adjust the pump, or to disassemble the pump for cleaning or sterilization.

Abstract: The Specification discloses a parallel-piped freezing frame having a plurality of compartments for freezing of flexible bags of plasma or other biological fluid. A slidable freezing plate is mounted within each compartment and cam means are provided for directing the freezing plate downwardly and laterally against a side wall of the component. The freezing plate and associated planar wall thereby mold the flexible bag into a flat but slightly wedge-shaped configuration. A freezing medium such as alcohol circulates through the freezing frame to freeze the contents of the flexible bag.