Patent ID: 9656274
Date: 2017-05-23
CPC Classifications: A61M,B01D,B01L,B04B,G01N

Claim:
1. A system comprising: a container; a physiological fluid subjected to centrifugation in the container so as to provide an interface in the physiological fluid with red blood cells separated from at least one desired component of the physiological fluid; and a floating separator structure floating within the physiological fluid within the container, the floating separator structure having a shape and material that define a center of buoyancy of the floating separator structure in the physiological fluid within the container; wherein the floating separator structure includes: an outer periphery having an outer diameter smaller than an interior diameter of the container and having an axial height, an upwardly facing concave accumulating surface recessed lower than the axial height of the outer periphery and positioned radially inward from the outer periphery, and the center of buoyancy of the floating separator structure is located relative to the upwardly facing concave accumulating surface such that the upwardly facing concave accumulating surface is located just below the interface with the separated red blood cells to accumulate a small layer of red blood cells thereon while the outer periphery extends above the interface with the separated red blood cells.