Anesthetic syringe having a longitudinally displaceable feeding piston and check valve having passage and blocking device

A syringe, more specifically an anesthetic syringe with a longitudinally displaceable feeding piston which is movably disposed above a first hydraulic chamber and with a second hydraulic chamber, the first and second hydraulic chambers being connected via a first control element for regulating resistance, the first control element being operable via a switch element, and the switch element being an actuating pin, wherein the actuating pin is assigned to a first check valve, so that the first check valve can be actuated via the actuating pin, and

• wherein the syringe is configured to provide a feedback force to a user via an amplification of the acting force, the amplification being implemented via another pin with the action of a force via a lever.