OPTICAL AND LASER-POWERED SYSTEMS FOR USE IN MEDICAL AND SURGICAL VASCULAR TREATMENTS COMPRISING PRIMARILY A LASER SOURCE, A SENSING/CONTROL DEVICE AND OPTICS FOR VASCULAR TREATMENTS, PARTS AND ACCESSORIES THEREFOR, AND RELATED SOFTWARE SOLD AS A UNIT, ALL FOR MEDICAL USE; DIFFUSERS FOR MEDICAL AND SURGICAL USE; DIODE LASERS FOR USE IN MEDICAL AND SURGICAL INSTRUMENTS; OPTICAL FIBERS FOR USE IN MEDICAL AND SURGICAL INSTRUMENTS; LASERS, LIGHT SOURCES, LAMPS, LENSES, WAVE GUIDES, AND FIBER OPTIC PROBES, PARTS AND ACCESSORIES THEREFOR, AND RELATED SOFTWARE SOLD AS A UNIT; VENOUS DISEASE TREATMENT MEDICAL INSTRUMENTS, NAMELY, LASER, OPTICAL FIBER, SURGICAL KIT FOR USE IN THE TREATMENT OF VENOUS DISEASE CONTAINING CATHETER/INTRODUCER, OPTICAL FIBER, INTRODUCER NEEDLE, INTRODUCER DILATOR AND GUIDE WIRE, AND RELATED SOFTWARE SOLD AS A UNIT; AND KITS FOR USE IN THE TREATMENT OF VENOUS DISEASE CONTAINING CATHETER/INTRODUCER, OPTICAL FIBER, INTRODUCER NEEDLE, INTRODUCER DILATOR AND GUIDE WIRE, AND RELATED SOFTWARE SOLD AS A UNIT