Surgery – Truss – Pad
Patent
1990-07-25
1992-06-09
Smith, Ruth S.
Surgery
Truss
Pad
128666, 128691, 356 41, 351221, A61B 500
Patent
active
051198142
ABSTRACT:
A non-invasive retinal scanning system which monitors internal blood loss. A portion of the ocular fundus is illuminated, in an annular fashion, with two wavelengths of light, one of which serves as a reference. Scanning the fundus circumferentially enables retinal venous blood to be detected, which corresponds to desaturated hemoglobin. The intensity of light reflected from the retinal vein is detected and converted to an electronic signal proportional to the value of oxygen saturation of venous hemoglobin, which becomes the value of interest. Thus, a decline in venous oxygen saturation over time correlates linearly with progressive internal bleeding.
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"The choroidal eye oximeter: An instrument for measuring oxygen saturation of blood in vivo," Laing et al., IEEE Transactions on Biomedical Engineering, May 1975, vol. BME-22, No. 3, pp. 183-195.
Nasser Jr. Robert L.
Smith Ruth S.
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