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Device for monitoring intraocular pressure

A technology of intraocular pressure and equipment, applied in the direction of tonometer, fluid pressure measurement using capacitance change, glasses/goggles, etc., which can solve the problems of heavy wearing, uncomfortable, and regardless of corneal microstructure

Active Publication Date: 2013-11-27
UNIVERSITY OF DUNDEE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These devices are bulky and uncomfortable to wear due to the need to flatten the naturally stiff sclera
Other techniques rely on the use of contact lenses equipped with pressure sensors, but these either measure IOP at a single point and require patient activation (US2007 / 0129623), or measure IOP using circumferential pressure sensors placed based on The geometry of the cornea, regardless of the microstructure of the cornea and its particularly low rigidity in the transition zone and in the radial direction (WO03 / 001991)

Method used

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  • Device for monitoring intraocular pressure
  • Device for monitoring intraocular pressure
  • Device for monitoring intraocular pressure

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0106] refer to figure 2 , one embodiment of the device of the present invention comprises two main components: a soft contact lens 10 and an external instrument 11 . Although the dimensions may vary, in this embodiment the contact lens has a diameter of 14-15 mm and a thickness in the range between 120 μm (along the edges) and 280 μm (in the central region). which is composed of a Young's modulus E of 0.30MPa and more than 60×10 -11 cm.mLO 2 / s.Ml.mmHg oxygen transmission rate, soft silicone hydrogel material, which ensures comfortable use over a period of more than 24 hours, and can be adapted to corneas with different sizes and curvatures. Has a 6.0mm central area without any obstruction to achieve a clear view during use. The lens is worn in a similar manner to a normal contact lens based on daily or prolonged wear.

[0107] The contact lens has a circumferential pressure transducer 12 designed to detect small changes in intraocular pressure (IOP) and transmit it wire...

example 2

[0110] The following will refer to image 3 and 4 , describing the details of the pressure sensor design. This pressure sensor has been found to produce a stronger IOP signal than previous designs, and is more reliable and stable in its operation in response to eye movement and tear film quality. The design is based on using eyelid pressure to indent the cornea and correlating the resulting reactive deformation of the contact lens to the intraocular pressure (IOP). The design involved modifying the soft contact lens 10 within a typical dimensional area with a 7 mm internal diameter and a 2.5 mm width. like image 3 As shown, the profile in this area is formed with a protruding portion 20 whose peripheral area 21 has been weakened (thinned). The space above the protrusion is covered with a relatively rigid bridge 22 formed by a ring of relatively rigid material having a modulus of elasticity typically around 1 GPa; and a top surface 23 which matches the front profile of the...

example 3

[0121] now refer to Figure 6 a and 6b, The deformation of the diaphragm 24 is measured using a capacitor system comprising two thin metal films 26, 27 fixed to the inner surface of the bridge element and the diaphragm, respectively. When the diaphragm deforms, the distance between the two metal films changes, resulting in a change in the capacitance of the capacitor formed by the two films. This in turn affects the resonant frequency of the oscillator formed by the combination of the capacitance of the capacitor and the inductance of the induction coil. To power the circuit of capacitors and record the resonant frequency value, a magnetic field is formed between an induction coil 28 embedded on the outer surface of the bridge element 22 and an excitation coil 29 placed externally close to the eye (for example on a pair of eyeglasses 30) and the The magnetic field surrounds the induction coil 28 and the excitation coil 29 ( Figure 7). By energizing the field coil with an a...

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Abstract

Disclosed is a device adapted to measure intraocular pressure comprising: a corneal contact lens having a pressure sensor mounted in a recess or cavity in the contact lens, and wherein the contact lens has a back surface which is formed so as to protrude in a desired portion beyond the profile of the adjacent part of the lens and thus to press against the cornea, which protruding portion experiences a reactive deformation which is detected directly or indirectly by the pressure sensor.

Description

[0001] The present invention relates, without limitation, to a contact lens device for measuring and / or continuously monitoring intraocular pressure, devices comprising the device, and methods of using the device or device to measure or monitor intraocular pressure. Background technique [0002] Glaucoma is an eye disease that is one of the leading causes of irreversible blindness worldwide. The main risk predictor for the disease is increased intraocular pressure (IOP). Therefore, glaucoma risk prediction and management includes measurement of IOP by tonometry. [0003] It is generally accepted that the normal range for IOP is 10-21 mmHg, so individuals with IOP above this range are often treated with IOP-lowering drugs to prevent or delay the progression of glaucoma. Additionally, an individual's IOP can vary throughout a 24-hour period depending on whether the individual is asleep or awake, the level of physical exertion or hydration, and the state of mind. Therefore, mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/16
CPCA61B3/16G01L9/12G02C7/04
Inventor 艾哈迈德·埃尔谢赫约翰·克拉姆普
Owner UNIVERSITY OF DUNDEE
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