Patent ID: 8474630

Claim:
A blood platelet collection device, comprising: a container that partially defines a volume by a sidewall extending from a first end to a second end; a float positioned in the volume, the float having a platelet collection surface; a first access port in the container; a second access port in the container; a plunger positioned above the float and substantially axially aligned with the float within the volume; and a projection extending from the float toward the plunger to act as a stop to limit downward movement of the plunger relative to the float; wherein blood is introduced into the container through the first access port and wherein sedimented platelets are withdrawn through the second access port; wherein the plunger further includes a bottom surface and a fluid escape tube opposite the bottom surface, wherein when the plunger is moved downward toward the float, the pressure imparted by the bottom surface expresses liquid below the plunger through the fluid escape tube into the volume above the plunger.