Since this syringe has projections provided on the rear surface of a flange of a syringe barrel, when it is inserted in an insertion groove of a cylinder holder, the tips of projections are compressed and the flange is fixed. Consequently, even when a solution having high viscosity is injected at higher...http://www.google.com.au/patents/US7264612?utm_source=gb-gplus-sharePatent US7264612 - Syringe barrel with guide
