Abstract: Disclosed injection apparatuses can include a hand-held unit, a control unit, and a pump. The hand-held unit can include a body portion, a head portion removably coupled to the body portion, and a needle, the body portion comprising a gripping portion extending at an angle relative to the head portion. The control unit can be remote from the hand-held unit and coupled to the hand-held unit via a power cable and a connecting tube. The control unit can have a control panel configured to allow a user to select a medicament dose volume. The pump can be disposed within the control unit and fluidly coupled to the needle via the connecting tube.

Abstract: Disclosed devices for injection of medicament to a subject can include a hand-held unit, at least one control unit, and one or more medicament chambers fluidly coupled to the control unit. The hand-held unit having a head portion and a body portion, the head portion comprising at least one needle and a movable head, the movable head being axially movable relative to the body portion between an extended position and a retracted position. The control unit being fluidly coupled to the hand-held unit and having a pump having a dosing chamber.

Abstract: Disclosed devices for injection of medicament to a subject can include a hand-held unit, at least one control unit, and one or more medicament chambers fluidly coupled to the control unit. The hand-held unit having a head portion and a body portion, the head portion comprising at least one needle and a movable head, the movable head being axially movable relative to the body portion between an extended position and a retracted position. The control unit being fluidly coupled to the hand-held unit and having a pump having a dosing chamber.