Needle hub for drug delivery device

A needle hub for a drug delivery device comprising:

• a hub body;
• an activation button manually moveable relative to the hub body, a portion of the activation button is positioned outside of the hub body, the activation button having a first actuation surface;
• a needle holder moveable relative to the hub body, the needle holder having a second actuation surface, the first actuation surface of the activation button configured to engage the second actuation surface of the needle holder;
• a needle attached to the needle holder;
• a needle spring biasing the needle holder to a retracted position where the needle is positioned within the hub body;
• a cannula holder moveable relative to the hub body and the needle holder;
• a cannula attached to the cannula holder, the cannula configured to be in fluid communication with a fluid source;
• and
• a cannula spring biasing the cannula holder to a retracted position where the cannula is positioned within the hub body,
• wherein the activation button is configured such that the portion of the activation button positioned outside the hub body can be accessed by the user to manually slide the entire activation button along the hub body to cause the first actuation surface of activation button to engage the second actuation surface of the needle holder to move the needle holder and the cannula holder from the respective retracted positions to insertion positions where distal ends of the needle and the cannula are positioned outside of the hub body, with the needle holder configured to return to the retracted position while the cannula holder remains in the insertion position, wherein movement of a portion of the hub body is configured to disengage a connection between the cannula holder and the hub body to allow the cannula holder to return to the retracted position,
• wherein the activation button is moveable along a first axis, and wherein the needle holder and the cannula holder are moveable along a second axis perpendicular to the first axis, and wherein the first actuation surface of the activation button is configured to disengage from the second actuation surface of the needle holder after movement of the activation button a predetermined distance along the first axis.