Autoinjector with multichamber product container
An autoinjector for discharging one or more liquid products includes: a housing containing a multichamber product container, which includes a syringe body and an injection needle rigidly arranged at the distal end of the syringe body. The syringe body includes a first chamber for a first liquid product, a second chamber for a second liquid product, and a bypass for fluidically connecting the first chamber and second chamber. The bypass is formed in or on the syringe body in the form of a curved section protruding radially outwards, and two plungers are arranged in the syringe body in an axially movable manner.
1 . An autoinjector for discharging one or more liquid products, comprising:
a housing;
a multichamber product container arranged in the housing and comprising a syringe body and an injection needle rigidly coupled to a distal end of the syringe body, wherein the syringe body comprises a first chamber configured for a first liquid product, a second chamber configured for a second liquid product, and a bypass for fluidically connecting the first chamber and second chamber, wherein the bypass is formed in or on the syringe body as a curved section protruding radially outward, wherein a first plunger and a second plunger are arranged in the syringe body in an axially movable manner, wherein the first liquid product and the second liquid product in an initial position of the autoinjector are separated from one another by the second plunger, and wherein the first plunger and/or the second plunger are movable in a discharge direction in order to discharge the product contained in the multichamber product container or the plurality of products contained in the multichamber product container;
a drive element configured to act on the first plunger during a discharge of the product; and
a first spring configured to act on the drive element, wherein a bias of first spring is sufficient such that the first spring is configured to discharge the liquid product or the plurality of liquid products out of the second chamber of the multichamber product container by moving the drive element by a discharge stroke; and
a multichamber product container holder fixedly arranged in the housing,
wherein the housing or the multichamber product container holder comprises a cutout within which the bypass is received, the cutout configured with a distal stop and a proximal stop that axially fix the bypass such that the multichamber product container is axially fixed in the housing or in the multichamber product container holder.
2 . The autoinjector according to claim 1 , wherein in the cutout is configured to taper to rotationally fix the bypass.
3 . The autoinjector according to claim 1 , wherein the cutout is formed in an elastically and/or plastically deformable manner.
4 . The autoinjector according to claim 1 , wherein one or more of the cutout, the proximal stop, and the distal stop are formed in an elastically and/or plastically deformable manner.
5 . The autoinjector according to claim 1 , wherein the cutout comprises the distal stop, and wherein a force acting on the multichamber product container in a distal direction holds the multichamber product container against the distal stop when the multichamber product container is inserted in the housing or in the multichamber product container holder.
6 . The autoinjector according to claim 5 , wherein one or more of the cutout and the distal stop are formed in an elastically and/or plastically deformable manner.