Surgery – Instruments – Light application
Patent
1991-09-24
1993-11-16
Shay, David M.
Surgery
Instruments
Light application
606 7, 606 15, A61B 506
Patent
active
052619044
ABSTRACT:
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 grating is formed on the proximal surface of the catheter window in alignment with laser energy from the optical fibers. The laser energy is modified by the diffraction grating to provide a desired spatial distribution pattern. Preferably, the diffraction grating provides a diverging beam suitable for forming a hole in an obstruction, the hole having a diameter that is approximately the same as the diameter of the catheter. The diffraction grating enables formation at the distal end of the catheter of a beam pattern having an elliptical or other noncircular cross section. In another embodiment, an optical fiber with a noncircular cross section is used to shape the laser radiation emitted from the laser catheter.
REFERENCES:
patent: 3188188 (1965-06-01), Norton
patent: 4648892 (1987-03-01), Kittrell et al.
patent: 4672961 (1987-06-01), Davies
patent: 4718417 (1988-01-01), Kittrell et al.
patent: 4917084 (1990-04-01), Sinofsky
patent: 4950266 (1990-08-01), Sinofsky
Baker Glenn S.
Sinofsky Edward L.
C. R. Bard Inc.
Shay David M.
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