Pulse oximeter and sensor optimized for low saturation

A - Human Necessities – 61 – B

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A61B 6/00 (2006.01) A61B 5/00 (2006.01)

Patent

CA 2186225

A pulse oximeter sensor (410) with a light source optimized for low oxygen saturation ranges and for maximizing the immunity to perturbation induced artifact. Preferably, a red (112) and an infrared light source (114) are used, with the red light source (112) having a mean wavelength between 700-790 nm. The infrared light source (114) can have a mean wavelength as in prior art devices used on patients with high saturation. The sensor of the present invention is further optimized by arranging the spacing between the light emitter (112, 114) and light detectors (116) to minimize the sensitivity to perturbation induced artifact. The present invention optimizes the chosen wavelengths to achieve a closer matching of the absorption and scattering coefficient products for the red and IR light sources. This optimization gives robust readings in the presence of perturbation artifacts including force variations, tissue variations and variations in the oxygen saturation itself.

Capteur d'oxymètre pulsé (410) à source lumineuse conçue de façon optimale pour des plages de faible saturation en oxygène et largement insensible aux artefacts induits par des perturbations. On utilise de préférence une source de lumière rouge (112) et une source d'infrarouge (114) dont la première (112) présente une longueur d'onde moyenne comprise entre 700 et 790 nm et dont la seconde (114) peut présenter une longueur d'onde moyenne identique à celle des dispositifs de l'art antérieur, à saturation élevée utilisés sur les patients. Le capteur est de plus conçu de façon optimale pour que les espaces entre les émetteurs (112, 114) et récepteurs (116) de lumière réduisent à un minimum les artefacts dus aux perturbations. Les longueurs d'onde choisies rendent optimale la concordance entre les coefficients d'absorption et de diffusion pour les sources de lumière rouge et les infrarouge. Cette conception optimale donne des lectures nettes en présence d'artefacts dus aux perturbations dont notamment les variations de force, de tissus et de saturation en oxygène.

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