Injection device and ampoule unit

An injection apparatus for the needle-free injection of a medium, comprising an injector device (1) and an ampoule unit (2), said ampoule unit (2) comprising a base body (4) in which the medium (3) injected is stored and a jacket (5) that exerts compressive forces on the base body (4), characterized in that a nozzle (13), as a discharge of the medium (3) injected, is disposed on the axially longitudinal end of the ampoule unit (2), which nozzle is located in the extension of the base body, that in the direction of the longitudinal axis, the jacket (5) envelops the base body (4) completely and the nozzle (13) partially so that the nozzle (13) lies close to the inside walls of the jacket (5) in a friction-locked and form-fitting manner and forms a snug fit, that the compressive forces of the jacket (5) at a minimum compensate for the internal stresses that built up during the production of the base body, that the base body is made of glass, borosilicate glass, that the plunger rod (18) is hollow and, after filling the ampoule with the medium, the plunger rod is pinched in at least one place.