TONOMETER
First Claim
1. A method for measuring internal pressure of a body comprising:
- aligning a longitudinal axis of a light projecting and collecting device with said body;
detecting changes of intensity of light reflected from a convex sector of a surface of said body and delivered by total internal reflection in a light guide, and wherein said changes are related to a distortion induced by a pneumatic pulse, andmatching a time-related feature associated with said changes of said light intensity measured with a given pressure value, wherein said time related-feature is any of the following;
a time length of said pneumatic pulse, a time interval in which said changes of said light intensity measured are detected, a slope of said changes of said light intensity measured.
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Accused Products
Abstract
A non-contact tonometer for measuring the intra-ocular pressure of an eye, projecting light into the eye and measuring the reflected light as affected by mechanical distortion. The cornea is distorted by delivering a pneumatic pulse. The tonometer consists mainly of an electro-optical unit mountable on the head of a user and a control unit. The control unit of the tonometer includes a display and optionally an audio device for instructing the user. The electro-optical unit employs a tubular wave guide, a light detector, and a reflector for deflecting a light beam to the eye and for eliminating a part of the reflected light reaching the detector. The aligning of the tonometer with the head of the user is optionally assisted by a reticle observed.
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Citations
10 Claims
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1. A method for measuring internal pressure of a body comprising:
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aligning a longitudinal axis of a light projecting and collecting device with said body; detecting changes of intensity of light reflected from a convex sector of a surface of said body and delivered by total internal reflection in a light guide, and wherein said changes are related to a distortion induced by a pneumatic pulse, and matching a time-related feature associated with said changes of said light intensity measured with a given pressure value, wherein said time related-feature is any of the following;
a time length of said pneumatic pulse, a time interval in which said changes of said light intensity measured are detected, a slope of said changes of said light intensity measured. - View Dependent Claims (2, 3, 4, 5, 7)
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6. A device for measuring internal pressure of a deformable body wherein changes in the reflectance of a sector of said body are measured in correlation with a distortion of said body effected by a pneumatic pulse, and wherein said sector located within a convex surface of said body, said device comprising:
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a first tube having a substantially thick wall pointing at said sector wherein the proximal face of said wall is adapted to receive light reflected from said body; a second tube for conveying pneumatic pulse to said deformable body; a light detector receiving light from said wall of said first tube, and a reflector used for both deflecting a beam of light of a light source through the lumen of said first tube to said body and for blocking reflected light from said body. - View Dependent Claims (8, 9, 10)
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Specification