Invivo Research, Inc.

Thomas F Lehman

John R Nelson

A method and device are disclosed for the detection of the relative percentage of at least one light absorber in the blood stream of living tissue. The method and device are based upon the employment of a narrow band width amplifier and pulses of different wavelength light sources wherein the frequency of the pulses of the light sources are selected so that a large component of the signal falls within the frequency of the narrow band amplifier, so that there is reduced likelyhood of interference from extraneous electromagnetic waves.

Blood constituent measuring device and method

An instrument housing having an improved means for storing a roll of paper of selected width and maximum diameter for use by a printer in which the housing has a rectangular opening in the top adjacent the housing front and a rectangular opening in the front forward of and below the opening in the top. A paper trough is positioned within the instrument housing below the top opening and rearwardly of the front opening, the trough having an open top and having opposed parallel sides and a rearward wall and a bottom wall which merge into a quarter circular integral intersection, the radius of curvature of the intersection being about one-half of the maximum diameter of the paper roll for which the trough is dimensioned. A trough gate forms a front wall, the trough gate having a downwardly extending inner surface curved at the lower portion thereof toward the trough back wall at a radius of curvature substantially equal to that of the radius of curvature of the intersection of the trough rearward and bottom walls, and the trough gate having a bottom wall spaced slightly above the trough bottom wall providing a slot therebetween whereby when a roll of paper is positioned within the trough the free end of the paper may exit the trough through the slot. An electrically actuated printer mechanism is positioned in the housing forward of the trough gate, the printer having means to receive the paper for pulling paper through the slot as the printer functions.

Growing community of inventors

Broken Arrow, OK, United States of America

Thomas F Lehman