A cap assembly for a container has a hollow housing with an upper end that receives a fluid transfer device and a lower end that engages a stopper on the container. The housing has an internal cavity open at the upper and lower ends and a radially outwardly extending portion at the lower end. A penetrator...http://www.google.de/patents/US6635043?utm_source=gb-gplus-sharePatent US6635043 - Container cap assembly having an enclosed penetrator
