Medical apparatus for cutting tissue; catheters for medical and surgical purposes; medical apparatus and instrument for curing stenosis, based on photochemical effect, photothermal effect and photomechanical effect; catheters for medical purposes for curing stenosis, based on photochemical effect, photothermal effect and photomechanical effect; medical apparatus for curing stenosis, based on photochemical effect, photothermal effect and photomechanical effect; laser scalpel for medical purpos...