Medical delivery system with a rotatable coding element

A medical delivery system comprising:

• a container adapted to contain a medicament in a chamber defined by the container and a slidably arranged piston which is moveable in a distal direction towards an outlet so as to reduce the volume of the chamber and expel the medicament through the outlet;
• a dosing assembly adapted to be fastened to the container, so as to allow a driver of the dosing assembly to move the piston of the container in the distal direction;
• wherein the dosing assembly defines a first fastening means which during fastening of the container to the dosing assembly engages a second fastening means of the container whereby the container is fastened to the dosing assembly through a predetermined movement defined by at least one of the first and the second fastening means, wherein at least a part of said predetermined movement is a concurrent axial and rotational movement, the predetermined movement being less than one revolution;
• wherein the dosing assembly comprises a rotatable element defining one or more protrusion(s) which during fastening of the container to the dosing assembly are adapted to be received in one or more corresponding indentation(s) of the container,
• wherein the rotatable element is adapted to rotate about a longitudinal axis of and relative to the first fastening means during fastening of the container to the dosing assembly, the rotatable element being adapted to be retained in a predetermined angular position relative to the first fastening means prior to fastening the container to the dosing assembly, and
• wherein the first and the second fastening means, the one or more protrusion(s) and the one or more corresponding indentation(s) are arranged such that the first and second fastening means must at least partly engage in order for the one or more protrusions to be received in the one or more corresponding indentation(s) such that the protrusions cannot be received in the corresponding indentations for rotating the rotatable element unless the first and second fastening means at least partly engage.