Non-invasive blood pressure sensor with motion artifact...

A - Human Necessities – 61 – B

Patent

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A61B 5/00 (2006.01) A61B 5/022 (2006.01)

Patent

CA 2347716

A non-invasive blood pressure sensor (22) includes a first fluid filled sensing chamber (A) having a diaphragm (168). A first transducer (26a) is fluidly coupled to the first sensing chamber (A) to sense fluid pressure within the first chamber (A). A flexible body conformable wall (164) surrounds the sensing chamber (A). The wall (164) applies force to the artery while preventing pressure in a direction generally parallel to the artery from being applied to the sensing chamber (A). The flexible body conformable wall (164) includes a second fluid filled chamber (F). A second transducer (26b) fluidly coupled to the second chamber (F) senses fluid pressure in the second chamber (F). As varying pressure is applied to the artery, pressure wave forms are sensed by the first transducer (26a). Using output signals of the first, and second transducers (26a, 26b), the sensed pressure waveform data is analyzed to derive waveform parameters from which blood pressure values are derived. The effects of motion artifacts are reduced by the use of signals from both the first, and second transducers (26a, 26b).

L'invention se rapporte à un capteur non invasif (22) de pression sanguine comportant une première chambre de détection (A) remplie de fluide et pourvue d'une membrane (168). Un premier transducteur (26a) est couplé de manière fluide à la première chambre de détection (A) de manière à détecter la pression du fluide au sein de la première chambre (A). Une paroi souple (164) susceptible de se conformer au corps entoure la chambre de détection (A). Cette paroi souple (164) susceptible de se conformer au corps comporte une seconde chambre (F) rempli de fluide. Un second transducteur (26b) couplé de manière fluidique à la seconde chambre (F) détecte la pression du fluide dans la seconde chambre (F). Lorsqu'une pression variable est appliquée à l'artère, le premier transducteur (26a) détecte des formes d'onde de pression. En utilisant les signaux de sortie des premier et second transducteurs (26a, 26b), il est possible d'analyser les données des formes d'onde de pression détectées et d'en déduire des paramètres de formes d'onde à partir desquels on calcule les valeurs de pression sanguine. On réduit les effets des artefacts de mouvement en utilisant conjointement les signaux des premier et second transducteurs (26a, 26b).

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