A needless valve is described which avoids the suctioning problems of the prior needleless devices upon deactivation and which preferably provides a positive self-purging effect. The valve is self-purging at the end of an administration cycle, avoiding clogging of attached catheters or other devices,...http://www.google.com/patents/US6840501?utm_source=gb-gplus-sharePatent US6840501 - Needleless valve
