Non invasive method for detecting an electric parameter...

A - Human Necessities – 61 – B

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A61B 5/03 (2006.01)

Patent

CA 2711622

The invention relates to a non-invasive method for detecting an electric parameter depending on the intralabyrinth pressure in a subject submitted to a repetitive sound stimulation having a predetermined time origin and frequency, by collecting outside the skull of the subject the electric signals emitted by the cochlea in response to said stimulation, wherein said method comprises the following steps: a) sending to the cochlea sound stimulations of the tone burst type with alternating phases; b) collecting the electric responses of the cochlea and the auditive nerve to said stimulations; c) isolating the component of a response corresponding to the average of the electric responses to a positive phase stimulation minus the average of the responses to a negative phase stimulation; d) removing from said isolated response the signals having a time origin identical to the time origin of the stimulation; and e) thus obtaining a cochlea microphonic potential (PMC) of the type representing the intralabyrinth pressure of the subject.

Procédé non invasif de détection d'un paramètre électrique dépendant de la pression intralaby-rinthique chez un sujet soumis à une stimulation sonore répétitive dont l'origine temporelle et la fréquence sont prédéterminées, en collectant, à l'extérieur de la boîte crânienne du sujet, des signaux électriques émis par la cochlée en réponse à cette stimulation, ce procédé com-prenant des étapes consistant à : a) envoyer vers la cochlée des stimulations sonores de type bouffées tonales à phases alternées, b) collecter les réponses électriques de la cochlée et du nerf auditif à ces stimulations, c) isoler la composante d'une réponse correspondant à la moyenne des réponses électriques à une stimulation à phase positive moins la moyenne des réponses à une stimulation à phase négative, d) éliminer de cette réponse isolée les signaux dont l'origine temporelle est identique à l'origine temporelle de la stimulation et e) ce grâce à quoi on obtient un potentiel microphonique cochléaire (PMC) type représentatif de la pression intralabyrinthique du sujet.

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