A bone cement delivery unit having a rigid support structure with a first portion configured to engage and retain a bone cement reservoir against its casing, a second portion supporting a transmission system and a third portion supporting and guiding a slidable push rod along the injection direction. The delivery system may include a control unit sliding the push rod opposite to the injection direction before stopping the push rod if the quantity of the bone cement pushed out of the reservoir has reached at least a predetermined minimum value, such as to eliminate residual flow. Also, the delivery system may include an adaptor including members electrically connected to the control unit, with the cement reservoir including a sensor for monitoring curing of the bone cement in electrical contact with the members of the adaptor.