Precision low-dose, low-waste syringes and ergonomic attachments therefor

A system for operating a syringe, the syringe comprising:

• a syringe body, including a syringe barrel having a lumen, and a plunger adapted to be received within the lumen, the plunger having a plunger thumb pad, the syringe barrel having a flat surface extending in an axial direction;
• and
• an attachment, adapted to be moved relative to the syringe body, the attachment comprising a main body having a plunger engaging end adapted to engage the plunger, the plunger engaging end including a receptacle adapted to receive the plunger thumb pad and the main body including a guide end including a pair of opposed retaining edges formed in the guide end, the opposed retaining edges being adapted to engage respective opposing sides of the flat surface of the syringe barrel, the retaining edges operating to guide the attachment and keep the attachment aligned with the syringe barrel as the attachment moves relative to the syringe barrel,
• the main body further comprising a thumb actuated portion positioned on the main body of the attachment such that when the attachment is installed on the syringe body and a user grasps the syringe body with the user's fingers, the thumb actuated portion is positioned to be engaged by the user's thumb, the main body further comprising a pair of guiding projections located beneath the thumb actuated portion and arranged to slidingly engage opposing sides of the flat surface of the syringe body.