Patent ID: 9381291
Filing Date: 2016-07-05
CPC Classification: A61M,B01D,G16H

Claim Text:
1. A blood filtration device comprising: a generally cylindrical housing having an interior wall; an interior member mounted interior of the housing and having an external surface; one of the interior wall of the housing and the external surface of the interior member including a porous membrane spaced apart from the wall of the housing or surface of the interior member so as to define an annular gap therebetween; the housing and interior member being relatively rotatable; an inlet for directing whole blood comprising plasma and red cells into the annular gap; a first outlet for directing plasma passing through the membrane to a collection container; and a second outlet for directing from the annular gap the remaining blood components; wherein the membrane has a surface area sufficient to separate plasma at a flow rate resulting in the residence time of red blood cells within the annular gap being insufficient to cause undue hemolysis; the device further comprising a high perfusion region covered by the membrane and a non-perfused region extending beyond the membrane, and a circumferential ridge extending from one of the interior wall of the housing and the external surface of the interior member so as to reduce the annular gap therebetween, the circumferential ridge separating the high perfusion region from the non-perfused region.