Apparatus for determining percentage oxygen-saturation of blood

Claim 1

AN APPARATUS FOR THE SPECROGRAPHIC DETERMINING OF PERCENTAGE OXYGEN SATURATION OF BLOOD COMPRISING A TUBE OF LIGHT TRANSMITTING PLASTIC, SAID TUBE BEING CONSTRUCTED SO AS TO BE CONNECTABLE TO A PATIENT FOR WITHDRAWING A BLOOD SUPPLY AND CONNECTING TO SAID PATIENT FOR RETURNING SAID BLOOD SUPPLY, MEANS FOR SUPPORTING SAID TUBE COMPRISING PLATES OF OPAQUE MATERIAL SPACED EDGE-TO-EDGE SO AS TO FORM A NARROW SLIT IN WHICH SAID TUBE IS DISPOSED LIGHT TRANSMITTING COVERING PLATES POSTIONED SO AS TO COVER THE BOTTOM AND TOP OF SAID SLIT FOR CONFINING THE TUBE IN SAID SLIT BETWEEN SAID OPAQUE PLATES, MEANS FOR ILLUMINATING ONE FACE OF SAID TRANSMITTING COVERING PLATES AND SAID TUBE POSITIONED IN THE SLIT BETWEEN SAID OPAQUE PLATES, AND AT LEAST TWO PHOTO-RESPONSIVE CELLS RESPONSIVE RESPECTIVELY TO RED LIGHT AND INFRA-RED LIGHT MOUNTED ON A LIGHT PROTECTED HOUSING LINEARLY ALONG THE SLIT AND IN A POSITION TO RECEIVE LIGHT TRANSMITTED TRANSVERSELY THROUGH THE SLIT AND THE TUBE IN SAID SLIT.