An improved catheter design and related methods providing for a sensor disposed within a sensor lumen to provide detection and warning of instruments placed within the proximity of various anatomical structures. The sensor lumen can extend axially the length of a drainage lumen. The sensor or sensors should be able to provide detection warnings for the entire region. The sensor will activate a visual sensor, for example, an LED, an audible sensor, for example, a siren, or similar type alert notification systems. The detecting and indicating means can generate an indicator signal indicative of the presence and/or absence of the instrument in the lumen, and generally provides feedback to the surgeon.