Spectral photometer for medical use in determining skin coloration

• US 4,241,738 A
• Filed: 04/10/1978
• Issued: 12/30/1980
• Est. Priority Date: 06/13/1977
• Status: Expired due to Term

• Current Assignee: Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften e.V. (Max-Planck-Gesellschaft zur Frderung der Wissenschaften e)
• Original Assignee: Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften e.V. (Max-Planck-Gesellschaft zur Frderung der Wissenschaften e)
• Inventors: Lubbers, Dietrich W., Guilino, Ernst
• Primary Examiner(s): Michell, Robert W.
• Assistant Examiner(s): Tayon, Jeffrey W.
• Application Number:
  US05/895,123
• Time in Patent Office: 995 Days
• Field of Search: 128/2 A, 128/2 L, 356/39-41, 356/308, 356/326, 356/418, 356/419, 128/665-667, 128/632, 128/633, 128/636, 128/637
• US Class Current: 600/479
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: G01J 2003/2866 Markers; Calibrating of scan
• CPC Class Codes: G01J 3/28 Investigating the spectrum using colour filters G01J3/51
• CPC Class Codes: G01N 21/8507 Probe photometers, i.e. with optical measuring part dipped into fluid sample

Abstract

A housing contains a light source, a monochromator, a photosensitive unit and an oscilloscope-type display. A flexible bundle of fiber-optic elements extends from within the housing out, and is provided at its outer end with a spacing ring. The spacing ring is placed against a skin surface, holding the ends of the fiber-optical bundle properly spaced and oriented relative to the skin surface. At the other end of the bundle, the bundle is subdivided into one branch which receives light from the source, and another branch which emits light refleced from the skin surface into the monochromator. The monochromator projects the spectrum of the skin-reflected light onto the photosensitive unit. The output signal of the photosensitive unit, in a sequential and periodic manner, contains information concerning successive spectral components of the skin-reflected light. The sweep of the display is synchronized with this periodic sequence, so as to display a spectral analysis of the skin-reflected light.

Claims

1. A spectral photometer for use in evaluating the coloration of the human skin surface, of the type having a light source, light-conducting means and light-sensitive means for generating signals dependent upon intensity of the light received therein, in the combination comprising:

the light conducting means, including flexible fiber optics members interspersed among one another, having one end and a second end;

a support and spacing ring, said one end being positioned within said spacing ring to establish the correct spacing between said light-conducting means and the skin surface, said second end being divided into a first branch and into a second branch, said light source being arranged to emit light into said first branch, whereby the light is transmitted through said light-conducting means onto the skin surface, reflected from the latter, transmitted back through said light-conducting means and emitted from said second branch;

monochromator means for receiving the light emitted from said second branch and spectrally projecting it onto said light-sensitive means, said monochromator means comprising means operative for projecting onto the light-sensitive means successive portions of the spectrum of the light received from the second branch in a progressive and periodic sequence;

display means connected to receive signals generated by the light-sensitive means and produce a spectral display of the light reflected from the skin surface, said display means comprising an oscilloscope having an information-signal input connected to the light-sensitive means, and sychronizing means for synchronizing the sweep of the oscilloscope with the periodic operation of said monochromator means, said monochromator means comprising a rotating filter having angularly successive sections to transmit successive parts of the spectrum of the light received from said second branch onto said light-sensitive means.

2. The spectral photometer of claim 1, further comprising:

photo-sensitive means including a first photosensitive element positioned to receive light from said second branch through said rotating filter, and a second photosensitive element, second light-conducting means having a first end positioned to receive light emitted by said light source and a second end positioned to emit light through said rotating filter onto said second photosensitive element, and signal-dividing means having two inputs each connected to receive the signal produced by a respective one of two photosensitive elements and having an output connected to the information-signal output of said oscilloscope.