A dual-chamber syringe has a plunger within an inner delivery chamber in fluid communication with an ejection port. The deliver chamber is formed within a tubular element axially slidable within a tubular guide. The tubular guide and the syringe outer barrel form an outer reservoir chamber. The outer...http://www.google.com.tw/patents/US6132400?utm_source=gb-gplus-share專利 US6132400 - Dual-chamber syringe and methods
