Method and device for determining the intraocular pressure,...

A - Human Necessities – 61 – B

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A61B 3/16 (2006.01)

Patent

CA 2414143

The present invention relates to a method and a device for measuring the pressure p in an eye, the so-called intraocular pressure. The method includes a contact body with a known geometry being pressed against the eye with a gradually increasing contact force F and that when the area of deformation of the eye A can be determined, the pressure can be obtained from the relation P=F/A, whereby the frequency characteristic of a contact body associated with a sensor system oscillating in resonance is read, the contact body is pressed against the eye to form a new system oscillating in resonance, the contact force and frequency characteristic for the new system is read, and the change in frequency characteristic is calculated. In this way, the pressure of the eye can be determined since the sought deformation area A is a function of the change A(fch ar). The device has a contact body (4) for pressing against the eye (1) and a means (3) of determining the force with which the contact body is pressed against the eye, whereby the contact body (4) is part of a system oscillating in resonance, and the resonance system is connected to a means (9) for reading the frequency characteristic of the system.

La présente invention porte sur un procédé et un dispositif de mesure de la pression p d'un oeil, c.-à-d. la pression intra-oculaire. Le procédé comprend un corps de contact, d'une géométrie connue, comprimé contre l'oeil avec une force F augmentant progressivement. Lorsque la zone de déformation de l'oeilA peut être déterminée, la pression peut être obtenue à partir de la relation P=F/A. Il est alors possible de lire la courbe de résonance d'un corps de contact associé à un système de capteur oscillant en résonance, le corps de contact étant comprimé contre l'oeil de façon à former un nouveau système d'oscillation en résonance ; on lit ensuite la force de contact et la courbe de résonance du nouveau système, et on calcule le changement de la courbe de résonance. Il est ainsi possible de déterminer la pression de l'oeil puisque la zone A de déformation recherchée est fonction du changement A(f¿char?). Le dispositif possède un corps (4) de contact permettant d'exercer une pression contre l'oeil (1) et un élément (3) de détermination de la force avec laquelle le corps de contact est comprimé contre l'oeil. Le corps (4) de contact fait partie d'un système oscillant en résonance, ce système oscillant en résonance est raccordé à un dispositif (9) destiné à lire la courbe de résonance.

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