A dual-chamber type prefilled syringe comprises a cylindrical body within which a front plug member, a middle plug member and an end plug member are hermetically fitted to form a first chamber and a second chamber. The cylindrical body (2) has an inner surface formed with a bypass (14). When the middle...http://www.google.co.uk/patents/US20060189943?utm_source=gb-gplus-sharePatent US20060189943 - Two-chamber-type pre-filled syringe
