West Pharmaceutical Services, Inc.
MEDICAL ADMINISTRATION BARREL WITH GROOVES AND METHOD OF SEALING SAME

Abstract:

A barrel is provided having open proximal end and a closed distal end, and at least one groove in an interior wall thereof. The groove(s) define a length extending a distance from the open end of the barrel toward the distal end of the barrel and defining a substantially constant depth and width along the length thereof. A piston is in sealing engagement with the interior wall of the barrel. The groove(s) permits fluid to bypass the piston when positioned along the groove(s). At least a portion of the piston is positioned distally from the groove(s), thereby sealing substance within the barrel.