Container adapter, delivery assembly and method of delivering a liquid to a patient

A container adapter for a medical delivery device having a container seat for holding a container in a predefined position, a dosage chamber, a dosing mechanism to transfer a liquid from the container held in the container seat to the dosage chamber and a lock mechanism adapted to prevent operation of the dosing mechanism when no container is held in the container seat and to allow operation of the dosing mechanism when the container is held in the container seat, comprising:

• an adapter container seat arranged to hold the container in a predefined position:
• a joint structure arranged to be detachably positioned in the container seat of the medical delivery device and to connect the adapter container seat to the dosing mechanism of the medical delivery device when the joint structure is positioned in the container seat of the medical delivery device;
• and
• an unlock member adapted to activate the lock mechanism of the medical delivery device such that operation of the dosing mechanism is allowed when the joint structure is positioned in the container seat of the medical delivery device.