A connector system for a medical device comprising: a first connector having an elongate opening; a second connector (24, 200) comprising a housing including a lock portion configured to be received within the elongate opening of the first connector, the first connector movable relative to the second connector (24, 200) between an initial position where the first connector is not in fluid communication with the second connector (24, 200) and an activated position where the first connector is in fluid communication with the second connector (24, 200), the lock portion of the second connector (24, 200) comprising an undercut (160, 210) defined by a recessed portion of the housing; and a locking member connected to the first connector, the locking member transitionable between an unlocked position where the second connector (24, 200) is movable within the elongate opening of the first connector and a locked position where the locking member is configured to engage the lock portion of the second connector (24, 200) to lock the first connector to the second connector (24, 200) in the activated position, wherein the locking member comprises a spring body received by the elongate opening of the first connector, and wherein the locking member is configured to engage the undercut (160, 210) to lock the first connector to the second connector (24, 200) when the first and second connectors (22, 24, 200) are in the activated position and the locking member is in the locked position, characterized in that the locking member comprises ribs extending radially outward from the spring body and ramps extending radially inward from the spring body, the ramps configured to automatically move the locking member from the locked position to the unlocked position when the first and second connectors (22, 24, 200) are transitioned from the initial position to the activated position. a first connector having an elongate opening; a second connector (24, 200) comprising a housing including a lock portion configured to be received within the elongate opening of the first connector, the first connector movable relative to the second connector (24, 200) between an initial position where the first connector is not in fluid communication with the second connector (24, 200) and an activated position where the first connector is in fluid communication with the second connector (24, 200), the lock portion of the second connector (24, 200) comprising an undercut (160, 210) defined by a recessed portion of the housing; and a locking member connected to the first connector, the locking member transitionable between an unlocked position where the second connector (24, 200) is movable within the elongate opening of the first connector and a locked position where the locking member is configured to engage the lock portion of the second connector (24, 200) to lock the first connector to the second connector (24, 200) in the activated position, wherein the locking member comprises a spring body received by the elongate opening of the first connector, and wherein the locking member is configured to engage the undercut (160, 210) to lock the first connector to the second connector (24, 200) when the first and second connectors (22, 24, 200) are in the activated position and the locking member is in the locked position, characterized in that the locking member comprises ribs extending radially outward from the spring body and ramps extending radially inward from the spring body, the ramps configured to automatically move the locking member from the locked position to the unlocked position when the first and second connectors (22, 24, 200) are transitioned from the initial position to the activated position.