Injector device

An injector device comprising:

• a housing;
• a medicament cartridge received in the housing, wherein the medicament cartridge contains a medicament;
• a needle unit comprising a needle;
• a first sleeve slidable along a longitudinal axis of the housing from a first position, in which the first sleeve conceals the needle, to a second position, in which the needle is exposed from an end of the first sleeve,
• wherein the first sleeve is configured to engage the needle unit so that, during use, movement of the first sleeve from the first position to the second position moves the needle unit from a primary position to a secondary position, and
• wherein, in the secondary position, the needle unit is located over an end of the medicament cartridge when the medicament cartridge is received in the injector device;
• and
• a second sleeve arranged to move telescopically with respect to the first sleeve, the first sleeve configured to extend from the second sleeve when the first sleeve is in the first position, wherein the first sleeve comprises a resiliently displaceable arm extending into the housing and into contact with the needle unit, wherein the resiliently displaceable arm is configured to disengage from the needle unit by moving away from the longitudinal axis as the first sleeve is moved from the first position to the second position, thereby allowing the first sleeve to move independently of the needle unit.

A method of operating an injector device, the method comprising:

• moving a first sleeve of the injector device relative to a second sleeve of the injector device from a first position to a needle unit engagement position, wherein moving the first sleeve relative to the second sleeve comprises
• causing a needle unit of the injector device to move from a primary position in which the needle unit is disengaged from a cartridge of the injector device to a secondary position in which the needle unit is engaged to the cartridge;
• and
• moving the first sleeve with the second sleeve from the needle unit engagement position to a second position to expose a needle of the needle unit from an end of the first sleeve, wherein moving the first sleeve with the second sleeve comprises causing a resiliently displaceable arm of the first sleeve to move away from a longitudinal axis of a housing of the injector device to disengage from the needle unit,
• thereby allowing the first sleeve to move independently of the needle unit.