A laser catheter includes an elongated tubular catheter body, one or more optical fibers extending through the catheter body and a catheter window mounted at the distal end of the catheter body. The optical fibers direct laser energy through the catheter window for removal of biological material. A diffraction...http://www.google.se/patents/US5261904?utm_source=gb-gplus-sharePatent US5261904 - Laser catheter having diffraction grating for beam shaping
