Surgery – Truss – Pad
Patent
1995-10-23
1996-08-27
Sykes, Angela D.
Surgery
Truss
Pad
356 285, A61B 502
Patent
active
055491146
ABSTRACT:
Apparatus for measuring the speed of blood in blood vessels in biological samples, for example, in retinal blood vessels, which apparatus includes: (a) a source of a beam of radiation having a principal wavelength, which radiation is substantially spatially coherent and has a temporal coherence length which is less than 1 picosecond; (b) a beam splitter for splitting the beam into a sample beam and reference beam; (c) optical apparatus for directing the sample beam to an area within the biological sample; (d) a reflector for reflecting the reference beam; (e) a detector for detecting an interference between the sample beam reflected from the area and the reflected reference beam and for generating an interference signal; (f) apparatus for altering an optical path length of the reference beam from the beam splitter to the detector at an alteration velocity; and (g) an analyzer for analyzing the interference signal to determine the speed of the blood in the area from a shift of a central frequency of a frequency spectrum of the interference signal from a frequency determined from the alteration velocity and the principal wavelength.
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Hellmuth Thomas
Petersen Christopher L.
Carl Zeiss, Inc.
Einschlag Michael B.
Sykes Angela D.
Winakur Eric F.
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