Abstract: The present disclosure relates to a sub-assembly of a medicament delivery device comprising a main body configured to accommodate a medicament, a plunger rod being moveable inside the main body along a length of the main body upon a user applying force to the plunger rod, and wherein the main body comprises a window through which the plunger rod is observable upon moving along said length, the main body further being provided with medicament delivery instructions along the length of an exterior of the main body, wherein the medicament delivery instructions are configured to instruct the user to move the plunger rod further into the main body to align a first visual indication of the plunger rod observable through said window with a next medicament delivery instruction to be performed along the length of the main body.

Abstract: A cassette for a medicament delivery device having a base unit is disclosed, where the cassette has a longitudinal axis defining a proximal direction and a distal direction; a body for accommodating a medicament container; a medicament delivery member; and a cap connected to the body through a connector, the cap enclosing a proximal end of the body; wherein the connector is disconnected when a distal force acting on the body in the distal direction and relative to the cap when the cassette is attached to the base unit. A medicament delivery device containing the cassette is also provided.