Buffy coat separator float systems and methods

A volume-occupying separator float comprising:

• a main body portion;
• one or more intermediate support members extending radially from the main body portion to form at least one well in a volume surrounding the main body portion;
• and,
• at least one septum within the main body portion, the at least one septum allowing access to a particular well from a top end of the main body portion.

A volume-occupying separator float comprising:

• a main body portion having a top end and a bottom end;
• a bottom support member extending radially from the bottom end of the main body portion;
• and
• a plurality of ridges extending radially from the main body portion and extending axially between the top end of the main body portion and the bottom support member to form at least one axially extending flute.

A volume-occupying float comprising:

• a first main body portion having a top end and a bottom end;
• one or more support members protruding from the first main body portion;
• a hollow internal cavity within the first main body portion;
• and
• wherein the first main body portion and the one or more support members define an annular volume;
• and
• one or more one-way valves permitting flow from the annular volume to the hollow internal cavity.

A kit for separating blood, the kit comprising:

• a flexible sleeve;
• and
• a separator float, the separator float comprising:
• a main body portion and one or more support members protruding from the main body portion to engage the sidewall of the flexible sleeve, wherein said main body portion together with an axially aligned portion of said sidewalls define an annular volume therebetween;
• and wherein said support members traverse said annular volume to produce n wells;
• wherein the flexible sleeve is capable of sealing at least a portion of buffy coat with the annular volume.