The present invention provides a syringe device including a needle, a syringe body, and a syringe adaptor between the needle and the syringe body. This syringe adaptor includes a reservoir and a plunger configured to move into and out of the reservoir in a direction perpendicular to the longitudinal direction of the needle. The position and direction of travel of the plunger in the syringe adaptor allows a user of the syringe of the present invention to safely and accurately operate the syringe with one hand.