ENSEMBLE D'ADMINISTRATION POUR DISPOSITIF D'ADMINISTRATION DE MÉDICAMENT ET DISPOSITIF D'ADMINISTRATION DE MÉDICAMENT LE COMPRENANT

摘要

The present disclosure relates to an administration assembly (10) for a medicament delivery device (1), comprising: a plunger rod (15), a first resilient member (17) configured to bias the plunger rod (15) in the proximal direction, an elongated plunger rod holder (21) configured to receive the plunger rod (15), an activation sleeve (23) configured to receive a portion of the plunger rod holder (21), and configured to move axially from a first position relative to the plunger rod holder (21) to a second position, wherein the activation sleeve (23) is configured to be biased towards the first position, wherein the plunger rod holder (21) has a first hold and release structure (21a) and the plunger rod (15) has a second hold and release structure (15a), wherein in the first position the activation sleeve (23) is configured to maintain the first hold and release structure (21a) in an axially locking contact position with the second hold and release structure (15a) in which the second hold and release structure (15a) is prevented from movement relative to the first hold and release structure (21a), thereby locking the plunger rod (15) axially relative to the plunger rod holder (21), wherein in the second position the activation sleeve (23) is configured to allow the first hold and release structure (21a) to move from the axially locking contact position, whereby biasing of the plunger rod provided by the first resilient member (17) causes the second hold and release structure (15a) to act with a proximally directed force on the first hold and release structure (21a), moving the first hold and release structure (21a) tangentially from the axially locking contact position to thereby release the plunger rod (15) from the plunger rod holder (21).