Non-contact high frequency tonometer
Patent 4928697 Issued on May 29, 1990. Estimated Expiration Date: 
September 28, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 28, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3763696 Method of measuring ocular pulse Ultrasonic non-linear parameter measuring system Noninvasive vibration measurement system and method for measuring amplitude of vibration of tissue in an object being investigated Patent #: 4819649 InventorAssigneeApplicationNo. 250165 filed on 09/28/1988US Classes:600/402, Eye vibrated600/438Used as an indicator of another parameter (e.g., temperature, pressure, viscosity)ExaminersPrimary: Kamm, William E.Attorney, Agent or FirmInternational ClassA61B 003/16AbstractA non-contact tonometer for use in the measurement of intraocular pressure in the diagnosis of glaucoma utilizes low frequency sound to perturb a given corneal area. High frequency sound waves are directed toward the perturbed corneal area and reflected therefrom. The output signals created by amplitude modulation of the the reflected sound waves are directly related to the intraocular pressure. The tonometer eliminates the need for physical contact with the eye, topical anesthetization and has no audible sound with no visible light or other sensory impacts on the eye. | |
