Accession Number : ADA302758

Title :   CO sub 2 Laser Micromanipulator Parallax Error Resolved.

Descriptive Note : Rept. for 1 Feb 87-31 Jan 91,

Corporate Author : VANDERBILT UNIV NASHVILLE TN

Personal Author(s) : Werkhaven, Jay A. ; Tribble, Jerri A. ; Ossoff, Robert H.

PDF Url : ADA302758

Report Date : 31 JAN 1991

Pagination or Media Count : 14

Abstract : Most current C02 laser micromanipulators for microlaryngoscopy experience the parallax aiming problem. This occurs when the beam mirror is offset below the optical path for the microscope, making use of the laser difficult through small laryngoscopes or in pediatric patients. The newer 'hot mirror technology' micromanipulators that are now available overcome this problem. In addition to providing a laser beam coincident with the optical path, the newer units offer much smaller spot sizes (250-micron diameter at 400-mm focal length), but all partially absorb some of the light available for illumination. To quantitate this, optical absorption spectra were determined for five 'hot mirrors'. Clinical experience with more than 100 cases has demonstrated the advantages of these new mirrors to minimize mucosal thermal damage and give improved exposure for subglottic and pediatric laryngoscopy.

Descriptors :   *CLINICAL MEDICINE, *LASER BEAMS, *VISIBLE SPECTRA, *CARBON DIOXIDE, *MANIPULATORS, *LARYNX, *PARALLAX COMPUTERS, THERMAL PROPERTIES, MIRRORS, OPTICAL PROPERTIES, OPTICS, DAMAGE, SIZES(DIMENSIONS), HIGH TEMPERATURE, PATHS, ILLUMINATION, LASERS, FREE ELECTRON LASERS, RADIATION ABSORPTION, AIMING, PATIENTS, BIOMEDICINE, MUCOUS MEMBRANES, PEDIATRICS, MINIATURE ELECTRICAL EQUIPMENT.

Subject Categories : Anatomy and Physiology
      Lasers and Masers
      Cybernetics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE