A force feedback tonometer

A - Human Necessities – 61 – B

Patent

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A61B 3/16 (2006.01)

Patent

CA 2479490

Apparatus and method for measuring intraocular pressure (IOP) comprising a vibrator (13) which transmits a vibrational energy into an eyeball (12) through the eyelid (11) and measures at least one of a force or phase response in the eyeball. The measurements are taken by placing the tonometer (10) against the eyelid to induce vibration in the underlying eyeball. A force transducer (16) coupled to the vibrator measures the response of the eyeball from which a vibrational impedance of the eye is determined. Intraocular pressure is then calculated based on the vibrational impedance. In a preferred use of the apparatus, the tonometer is calibrated against a known intraocular pressure measurement permitting the patient to take subsequent relative IOP measurements at home or otherwise outside a traditional medical setting without the need for anesthetic or fear of infection.

La présente invention concerne un appareil et un procédé destinés à mesurer la pression intraoculaire (PIO), lequel appareil comprend un dispositif vibreur (13) qui transmet une énergie vibratoire à un globe oculaire (12) via la paupière (11) et mesure au moins une réponse de force et/ou de phase dans le globe oculaire. Selon l'invention, on prend les mesures en plaçant le tonomètre (10) contre la paupière afin d'induire des vibrations dans le globe oculaire sous-jacent. Un transducteur de force (16) couplé au dispositif vibreur mesure la réponse du globe oculaire, à partir de laquelle on détermine une impédance vibrationnelle de l'oeil. On calcule ensuite la pression intraoculaire sur la base de l'impédance vibrationnelle. Selon une utilisation préférée de l'appareil de l'invention, on étalonne le tonomètre par rapport à une mesure de pression intraoculaire connue, permettant de la sorte au patient d'effectuer ultérieurement des mesures relatives de la PIO à son domicile ou d'une quelconque autre manière hors d'une enceinte médicale classique sans nécessité d'anesthésique ou crainte d'une infection.

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