A device and method for intravascular treatment of an embolism, and particularly a pulmonary embolism, is disclosed herein. The system performs data transfers in response to memory faults resulting from requested data not being available at specified virtual addresses and performs mapping of data in cache memory. Additional sections may be added to the rod to lengthen its reach as needed by the tool operator. The floating trench portions will have a potential below the drift region and deplete the drift region.