The present invention relates to a kind of medicament delivery devices,Include:: shell( 3 ),Plunger rod reception passes through shell( 3 ),Which plunger rod can be in a first direction relative to shell( 3 )With can linear displacement,Activator button arrangement is linearly displaced to the second position from first position,To make plunger rod in a first direction,Second direction rotation preventer has annular exterior element,I.e.,It is rotatably fixed relative to the shell( 3 )It is partly received with annular inner member,Pass through the external component,The wherein external component,It is arranged to receive plunger rod with internal component and wherein inner part rotatably interlocks,On plunger rod,The external component,With the structure of internal component allow in a first direction rotating inner part component relative to external component and internal component to prevent to from rotation,Along the second direction and recording unit opposite with first direction( 5 )Including. First sensor is arranged to detect rotating inner part component and processing circuit, is configured to generate dosage discharge data, to respond the internal component rotation of detection.
