Detecting medical conditions with noninvasive body probes

A - Human Necessities – 61 – B

Patent

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A61B 5/00 (2006.01) A61B 5/103 (2006.01)

Patent

CA 2505136

A method and apparatus for improving the diagnostic performance of a probe system (30) for detecting a medical condition in a patient by sensing volume changes in a monitored body part due to pulsatile arterial blood flow in the body part, characterized in calibrating the probe system (30) for the respective measurement site according to a predetermined characteristic of the monitored body part of the patient and quantifying the arterial pulsatile volume thereat. Such calibration is described with respect to probes including: (1) a pressure sensor (63), which senses pressure changes in a compressible fluid system to which the patient's body part (e.g., finger, toe or a distal portion of a limb) is subjected, which pressure changes are convertible to volume changes in the body part due to pulsatile arterial blood volume changes therein; and (2) an optical sensor (140), which senses optical density or transmissivity changes in the body part, which changes are also convertible to volume changes due to pulsatile arterial blood volume changes in the body part.

Procédé et dispositif servant à améliorer la capacité de diagnostic d'un système de sonde servant à détecter un état pathologique chez un patient par captage des modifications volumiques de la partie corporelle contrôlée sous l'effet d'un écoulement sanguin artériel pulsatile dans ladite partie, ce qui consiste à étalonner ce système de sonde afin de l'adapter au site de mesure en fonction d'une caractéristique prédéterminée de la partie corporelle contrôlée et à quantifier, au niveau de ce site, le volume pulsatile artériel. Cet étalonnage est décrit par rapport à des sondes comprenant : (1) un capteur de pression captant les variations de pression dans un système fluide compressible auquel est soumise la partie corporelle du patient, par exemple, un doigt, un orteil ou une partie distale de membre, ces variations de pression étant convertibles en modifications de volume de la partie corporelle sous l'effet des modifications provoquées par un volume sanguin artériel pulsatile et (2) un capteur optique captant la densité optique ou les modifications de transmission de la partie corporelle, ces modifications étant également convertibles en modifications volumiques provoquées par des modifications du volume sanguin artériel pulsatile dans la partie corporelle.

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