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Flattening ophthalmotonometer

A technology of manometer and flat eye, which is applied in the field of contact applanation tonometry, and can solve the problems of measurement result error, measuring device shake, jitter, etc.

Inactive Publication Date: 2013-04-24
HUAINAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN202161301U discloses an applanation tonometer, but this tonometer is a Goldman-type tonometer. When using this method to measure, it can only measure the intraocular pressure of a specific applanation area, that is, only measure One-time intraocular pressure value, when the measurer is unskilled, causing the measuring device to shake, or the subject shakes due to nervousness, may cause errors in the measurement results

Method used

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Embodiment Construction

[0022] Such as figure 1 As shown, an applanation tonometer of the present invention includes a housing 1, a probe 2, a light source 3, a first image sensor 4, a convex lens 5, a green light filter 12, a force sensor 6, a microprocessor 7, and a power supply 8 and display memory 9 . combine figure 2 As shown, the probe 2 is generally in the shape of a truncated cone with a small bottom and a big top, and is located under the housing 1 . The probe 2 is made of transparent optical materials such as glass or resin. The conditions for the light to be fully emitted on the side and bottom of the probe 2 are related to the incident angle of the light and the material of the probe. When the incident angle is greater than or equal to the critical angle, the light is injected from the probe. When it reaches the side or lower surface of the probe, total reflection occurs. In this embodiment, K9 glass with a refractive index of 1.53 is used to make it. image 3 As shown, the cone angl...

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Abstract

The invention relates to a contact type flattening ophthalmotonometer. The flattening ophthalmotonometer comprises a casing, a probe, a light source, a first image sensor, a convex lens, a force sensor, a microprocessor, a power source and a display storage device. The probe is approximately in a round table shape with the small bottom and the large top, is made of a transparent lens material and is located below the casing. An inclined plane is arranged on the side of the probe, the width d of the inclined plane is 3-10mm, the probe is installed on the casing through a connecting rod, the force sensor for detecting flattening force is installed on the connecting rod, and the light source is arranged above the probe. After light emitted by the light source is collimated through the convex lens to become parallel light beam, the parallel light beam vertically enters the upper end of the probe, and after sequentially undergoing total reflection on the side and the lower bottom surface of the probe and transmission on the inclined plane of the probe, the light beam is emitted out of the probe and directly enters a first image sensor. The contact type flattening ophthalmotonometer is simple in structure, convenient to use and suitable for accurate intraocular pressure detection for patients.

Description

technical field [0001] The invention relates to an intraocular pressure measuring device, in particular to a contact-type applanation intraocular pressure measuring instrument, which is used for accurately measuring intraocular pressure and is suitable for glaucoma diagnosis. Background technique [0002] Intraocular pressure is the pressure inside the eye, which refers to the pressure of the contents of the eyeball on the wall of the eyeball. The intraocular pressure of normal people is between 10 and 20mmHg (1mmHg=0.133kPa). Glaucoma is an irreversible blinding eye disease that causes visual impairment due to excessive intraocular pressure. Therefore, accurate determination of intraocular pressure is important for the diagnosis of glaucoma. [0003] Various methods and corresponding devices are known for determining intraocular pressure. The applanation tonometer uses a probe to press the surface of the eyeball (such as the cornea) to a certain area and obtain the corres...

Claims

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Application Information

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IPC IPC(8): A61B3/16
Inventor 马建国王宜结张瑾刘明
Owner HUAINAN NORMAL UNIV
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