Single needle blood fractionation system having adjustable recirculation through filter

Abstract From the Canadian patent

Abstract of the Disclosure, A single needle batch-type blood fractionation system for separating plasma from whole blood includes a disposable flow system having a single-lumen phlebotomy needle and associated donor conduit, a flow-through plasma separation filter and an in-process, fluid reservoir. During an initial draw cycle whole blood is pumped through the filter to the in-process reservoir by a peristaltictype inlet pump operating at a predetermined draw rate. When a predetermined volume of filtered plasma-deficient blood has been collected in the reservoir, as sensed by the weight of the reservoir the system reverts to a return cycle wherein a portion of the plasma deficient blood in …