Aidaptus is a two-step, spring-powered, single use auto-injector with a design that accommodates both 1mL and 2.25 mL prefilled glass syringes in the same base device. It also features stopper sensing technology with a self-adjusting plunger that automatically adapts to the individual stopper positions and different fill volumes in each syringe, with no change parts required. The auto-injector is available with two different spring strengths to accommodate a variety of drug viscosities.