Platelet freezing bag

Claim 1

A freezing bag useful for platelet freezing comprising two pliable layers of polymeric material, said layers defining between them a sealed compartment for receiving platelets to be placed therein for freezing, two needle ports at one end of the sealed top edge of said compartment for introducing material into said compartment, a draining port positioned between said layers at the other end of the sealed top edge of said compartment, the lower end of said draining port extending into said compartment below the sealed top edge thereof being slit longitudinally along two diametrically opposed lines, said two layers of polymeric material being additionally sealed diagonally below said lower end of said draining port to prevent contact of the contents of said compartment with said draining port, the seal thus-provided being burstable, three sealed tabs, said tabs being adapted upon being pulled apart to uncover respectively said needle and said draining ports, said tabs consisting of portions of said pliable layers of polymeric material extending beyond the sealed top edge of said compartment where said needle ports are positioned, said compartment being sealed at the two bottom corners thereof with a diagonal seal to facilitate post-thaw mixing of platelets introduced into said compartment for freezing and a hole provided through said freezing bag at the corner thereof diagonally opposite from said draining port and positioned such that the corresponding bottom diagonal corner seal is located between said hole and the interior of said compartment.