Apparatus for determining percentage oxygen-saturation of blood

• US 2,706,927 A
• Filed: 08/04/1949
• Issued: 04/26/1955
• Est. Priority Date: 08/04/1949
• Status: Expired due to Term

• Current Assignee: Howard Wood Earl
• Original Assignee: Howard Wood Earl
• Inventors: HOWARD WOOD EARL
• Application Number:
  US03/108,508
• Time in Patent Office: 2,091 Days
• US Class Current: 600/344
• CPC Class Codes: A61B 2562/0233 Special features of optical sensors or probes classified in A61B5/00
• CPC Class Codes: A61B 2562/043 in a linear array
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/6816 Ear lobe
• CPC Class Codes: G01N 21/251 Colorimeters; Construction thereof
• CPC Class Codes: G01N 21/314 with comparison of measurements at specific and non-specific wavelengths dual wavelength spectrometry G01J3/427
• CPC Class Codes: G01N 33/4925 measuring blood gas content, e.g. O2, CO2 , HCO3

Claims

5. A DEVICE FOR OBTAINING IN VIVO THE SPECTRAL TRANSMISSION OF BLOOD AND TISSUE AND OF THE TISSUE WHEN BLOOD IS SUBSTANTIALLY EXCLUDED THEREFROM COMPRISING A FRAME HAVING SUPPORTED THEREON PHOTO RESPONSIVE MEANS INCLUDING A LIGHT RECEIVING MECHANICAL SUPPORT SURFACE LIGHT SOURCE MEANS ON THE FRAME FOR PROJECTING A BEAM OF LIGHT TOWARD SAID SURFACE SO AS TO BE RECEIVED THEREON, MEANS MOUNTED ON THE FRAME FOR MOVEMENT TOWARD AND AWAY FROM SAID SURFACE FOR LIGHTLY HOLDING TISSUE IN VIVO MECHANICALLY BETWEEN SAID MEANS AND SAID SURFACE IN A POSITION THAT LIGHT WILL PASS THROUGH SAID TISSUE IN VIVO AND BE RECEIVED ON SAID SUFACE, MEANS ON SAID FRAME FOR COMPRESSING SAID TISSUE WHILE IT IS THUS MECHANICALLY HELD SO THAT BLOOD IS SUBSTANTIALLY EXCLUDED FROM SAID TISSUE WHILE LIGHT IS PASSED THERETHROUGH ONTO SAID SURFACE, SAID PHOTO RESPONSIVE MEANS BEING LOCATED SO AS TO BE ACTIVATED BY LIGHT PASSING THROUGH THE TISSUE AND RECEIVED ON SAID SURFACE.