Medicament Delivery Device

A medicament delivery device, comprising:

• a needle configured to move between a retracted position and an inserted position;
• an insertion mechanism to move the needle from the retracted position to the inserted position when activated;
• a locking arm which, in a locked position, is engaged with the insertion mechanism to prevent activation of the insertion mechanism and, in an unlocked position, is disengaged from the insertion mechanism;
• a retraction mechanism to move the needle from the inserted position to the retracted position when activated;
• and
• a trigger configured to move between a disengaged position and an engaged position,
• wherein the trigger is arranged to be moved from the disengaged position to the engaged position when the device is placed on the body of a patient, and on moving from the disengaged position to the engaged position, the trigger is configured to move the locking arm from the locked position to the unlocked position,
• wherein, on moving from the engaged position to the disengaged position, the trigger is configured to activate the retraction mechanism,
• wherein the locking arm is slideably mounted and is pivotably coupled to an unlocking lever such that a rotation of the unlocking lever causes a sliding movement of the locking arm, and
• wherein the trigger, on moving from the disengaged position to the engaged position, is configured to engage with the unlocking lever to rotate the unlocking lever, such that the locking arm is moved from the locked position to the unlocked position.