A penetrator for penetrating a stopper sealing an opening in a container. The penetrator includes a stamped piece of sheet material formed to define a shank having a length. A groove extends along the length of the shank. The shank has a pointed distal. The stamped piece of sheet material further includes...http://www.google.es/patents/US6610041?utm_source=gb-gplus-sharePatente US6610041 - Penetrator for a container occluded by a stopper
