Systems for sensing red blood cell hematocrit

B - Operations – Transporting – 01 – D

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B01D 17/12 (2006.01) A61M 1/02 (2006.01) A61M 1/36 (2006.01) B01D 17/02 (2006.01) B01D 21/24 (2006.01) A61M 1/38 (2006.01)

Patent

CA 2346906

Red blood cell sensing systems rely upon straightforward measurement geometries. The systems are based around a sensing station (332) having incident light source containing optical sensors (334) and (336) and blood collection tubes (290), (292) and (294). The systems hold the blood collection tubes (290), (292) and (294) a predetermined radial distance from the sensors (334) and (336), where a linear relationship exists between sensed reflected light measured by the sensor; (334) and (336) and red blood cell hematocrit in a range of at least 10 to 90. The systems make possible accurate red blood sensing without use of special optical cuvettes, mirrors, or focusing lenses. The systems also make possible the use of standard transparent plastic tubing, without reliance upon special optical cuvettes.

L'invention concerne des systèmes de détection de globules rouges, qui dépendent de géométries de mesures directes. Les systèmes sont basés sur une station de détection (332) ayant une source de lumière incidente comprenant des détecteurs optiques (334, 336) et sur des tubes de prélèvement sanguin (290, 292, 294). Les systèmes maintiennent lesdits tubes à une distance radiale prédéterminée des détecteurs (334, 336), une relation linéaire existant entre la lumière détectée réfléchie, mesurée par les détecteurs (334, 336) et l'hématocrite compris entre au moins 10 et 90. Les systèmes permettent une détection exacte des globules rouges sans besoin de cuves optiques spéciales, de miroirs ou de lentilles de focalisation. Les systèmes permettent également l'utilisation de tubes en plastique transparent traditionnels, sans besoin de cuves optiques spéciales.

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