A perfusion catheter system that allows selective temporary perfusion of small vascular or other anatomic structures arising from a host structure atraumatically. A control means measures the number of track crossings when a reading means is moved by a driving means in a direction corresponding to the radius of an optical disk for a predetermined period of time, and judges a direction in which a DVD-ROM player is installed on the basis of the measured number of track crossings. The parasitic element is positioned so as to radiantly couple with the PIFA in order to create the additional band of efficient operation. The fence preferably includes a left portion disposed generally on the left side of the saw unit, and a right portion disposed generally on the right side of the saw unit.