US Patent 12109403 Needle hub for drug delivery device

A needle hub for a drug delivery device includes a hub body, an activation button, a needle holder moveable relative to the hub body, 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, with the cannula configured to be in fluid communication with a fluid source, and a cannula spring biasing the cannula holder to a retracted position. 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.