A closed system, needleless valve device includes a generally tubular body defining an internal cavity. On the proximal end of the body there is an opening which is preferably sufficiently large to receive an ANSI standard tip of a medical implement. The distal end of the body has a generally tubular...http://www.google.com.tw/patents/US5928204?utm_source=gb-gplus-share專利 US5928204 - Medical valve and method of use
