Container for receiving and separating a fluid into its ingredients

A container for centrifugal plasma separation comprising:

• a first section including a chamber for receiving plasma, and a connector proximate an opening;
• a second section including a second chamber for retaining at least one plasma component after separation, an accumulation surface, and a connector proximate an opening opposite said accumulation surface;
• at least one said container sections further comprising a closure cooperating with said opening of said at least one container section and having an open position opening said chamber of said at least one container section and a closed position sealing said chamber;
• said chambers joined by said connectors and in fluid communication during centrifugation such that at least one plasma component may pass from said first chamber to said second chamber through said openings under the influence of centrifugation and accumulate on said accumulation surface, said connectors further permitting said sections to be separated after centrifugation;
• and
• closing means for causing said closure to be in said open position when said container sections are joined, and to assume said closed position when said container sections are moved transversely apart from one another during separation, but before said connection is broken, wherein said closure further comprises a valve seat and a cooperating valve body, and said closing means comprises an abutment associated with said valve body and cooperating with a corresponding portion of said valve seat such that said valve body moves into contact with said valve seat as said container sections are moved transversely apart.