An injection device comprising: a syringe having a relatively wide reservoir portion and, at a first end a relatively narrow discharge nozzle, and at a second end, a flange; a housing adapted to receive the syringe, so that the syringe is movable between a retracted position in which the discharge nozzle is contained within the housing and an extended position in which the discharge nozzle extends from the housing through an exit aperture; a drive that acts upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the discharge nozzle; and a syringe carrier configured to carry the syringe as it is advanced and restrains its advancement beyond its extended position, wherein the syringe carrier is configured to support the syringe between the reservoir portion and the discharge nozzle, characterised in that: the syringe carrier comprises a split sheath configured to surround the reservoir portion of the syringe, wherein the split sheath has a first internal diameter along its length, and a first end with a second internal diameter which is smaller than the first internal diameter so that the first end of the split sheath is configured to support the syringe between the reservoir portion and the discharge nozzle, wherein the syringe carrier comprises a split annular collet having an internal diameter that is smaller than an outer diameter of the reservoir portion of the syringe, wherein the split annular collet is adapted to support the syringe between the reservoir portion and the discharge nozzle during the advancement of the syringe from its retracted position to its extended position and restrain its advancement beyond its extended position. a syringe having a relatively wide reservoir portion and, at a first end a relatively narrow discharge nozzle, and at a second end, a flange; a housing adapted to receive the syringe, so that the syringe is movable between a retracted position in which the discharge nozzle is contained within the housing and an extended position in which the discharge nozzle extends from the housing through an exit aperture; a drive that acts upon the syringe to advance it from its retracted position to its extended position and discharge its contents through the discharge nozzle; and a syringe carrier configured to carry the syringe as it is advanced and restrains its advancement beyond its extended position, wherein the syringe carrier is configured to support the syringe between the reservoir portion and the discharge nozzle, characterised in that: the syringe carrier comprises a split sheath configured to surround the reservoir portion of the syringe, wherein the split sheath has a first internal diameter along its length, and a first end with a second internal diameter which is smaller than the first internal diameter so that the first end of the split sheath is configured to support the syringe between the reservoir portion and the discharge nozzle, wherein the syringe carrier comprises a split annular collet having an internal diameter that is smaller than an outer diameter of the reservoir portion of the syringe, wherein the split annular collet is adapted to support the syringe between the reservoir portion and the discharge nozzle during the advancement of the syringe from its retracted position to its extended position and restrain its advancement beyond its extended position.