Method and apparatus for improved photoplethysmographic...

Details Method and apparatus for improved photoplethysmographic... Method and apparatus for improved photoplethysmographic...

A - Human Necessities

61

B

A61B 5/026 (2006.01) A61B 5/00 (2006.01)

Patent

CA 2201577

An improved method and apparatus for the monitoring perfusion of the tissue of apatient by arterial blood is provided. An optical path length change is calculated for a number of digitized samples of a received light intensity signal generated by a photo detector that received light directed into a patient's tissue by one or more light emitting diodes or laser diodes. The optical path length changes are summed over a predetermined time such as one half cardiac cycle or other set interval to generate a perfusion index. An average perfusion index value may also be generated. In calculating the perfusion index spectral content compensation may be employed to compensate for the variety of center wavelengths associated with the spectral contents of various emitters.

Méthode et appareil améliorés pour surveiller la circulation du sang artériel dans le tissu d'un patient. Il s'agit de calculer un changement dans la base de mesure pour un certain nombre d'échantillons numérisés d'un signal d'intensité lumineuse produit par un détecteur ayant capté une lumière dirigée vers le tissu d'un patient par une ou plusieurs diodes photoémissives ou diodes laser. Les changements dans la base de mesure sont totalisés sur une période prédéterminée, par exemple la moitié d'un cycle cardiaque ou tout autre intervalle préétabli, pour donner un indice de perfusion. On peut aussi calculer l'indice de perfusion moyen. Dans le calcul de l'indice de perfusion, on peut introduire des corrections pour tenir compte de la multiplicité des longueurs d'ondes centrales des spectres provenant de divers émetteurs.

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