Patent ID: 7503906

Claim:
A solution injection system comprising: a mechanical syringe driving mechanism having a barrel holder with a flange insert groove and an arcuate guide groove formed on a front side wall surface of the flange insert groove; and a syringe having a syringe barrel comprising a barrel having a body configured to be received within said barrel holder and having a first end and a dispensing end opposite the first end, a flange extending outwardly from the barrel body proximate said first end and having an arcuate guide projection extending outwardly from a front surface of the flange towards the dispensing end, a press projection formed on the rear surface of the flange, a tip of the press projection being capable of being compressed to press the flange against a front sidewall surface of a flange insert groove when the flange is inserted into the flange insert groove formed in a cylinder holder and is fitted in a use position, wherein the arcuate guide projection is configured to engage with the guide groove of the barrel holder when the syringe barrel is inserted into the barrel holder, and wherein the press projection has a narrower width toward the tip, whereby the press projection is capable of being more deformed by being pressed.