The present application is directed to a system for treatment of sinusitis in a patient comprising a cannula (20) having at least one lumen (22) and a balloon dilation catheter (80) having an expandable balloon (86) on a distal region thereof, the balloon dilation catheter (80) being dimensioned for passage through the at least one lumen (22) of the cannula (20). According to the application the system further comprises a piercing tool (100) for creating an artificial access passageway to a sinus cavity of the patient wherein the piercing tool (100) comprises a shaft terminating in a sharpened distal tip (102) and a sheath (108) mounted on the shaft.
