Provided is a method performing vascular surgery utilizing a guiding apparatus that includes an adaptor and an introducer, by inserting a longitudinal section of the adaptor into the introducer and operating a valve of the introducer by moving a cursor provided on a side wall of the introducer within a travel region of the cursor. Operating the valve either fixedly attaches or releases the longitudinal section of the adaptor within or from the introducer. The adaptor includes an inner volume that encloses a plurality of ducts and the introducer includes an inner volume that aligns with the inner volume of the adaptor when the valve is fixedly attached the longitudinal section of the adaptor within the introducer, thereby providing ducts that allow an instrument to pass entirely through both the adaptor and the introducer.
