A delivery device for delivering an instrument into a catheter assembly may include a housing having a proximal end, a distal end, and a slot. The delivery device may include a guide feature, which may be disposed within the housing. The guide feature may extend through the slot. The delivery device may include an instrument disposed within the housing and extending through the guide feature. In response to movement of the guide feature along the slot in the distal direction a first distance, a first end of the instrument may be advanced in the distal direction a second distance, which may be greater than the first distance. A second end of the instrument may be stationary with respect to the housing.
