Accommodative Multifocal Intraocular Lens Design
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Solution Overview
Problem
Conventional intraocular lenses, including monofocal and multifocal types, fail to provide effective accommodative vision correction across various distances, and those made of silicone materials have limitations in movement and are prone to secondary cataract formation.
Innovation Solution
An accommodative multifocal intraocular lens design featuring an optical body with a multifocal zone and a silicone connecting member that allows for back-and-forth movement, enhancing focal power change, made from hydrophobic polyacrylic ester materials with specific recess and projection geometries to increase optical power range and reduce secondary cataract risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silicone material is used for intraocular lens, then the lens can be made soft and flexible, but the movement distance within capsular bag is limited and refractive index is low
Solution Approach 1:
The patent changes the material parameter from silicone to hydrophobic polyacrylic ester, which has higher refractive index and enables greater movement distance while maintaining the necessary softness for accommodation
2Strength
If silicone material is used for intraocular lens, then the lens can be made soft, but the possibility to form fibers and secondary cataract increases
Solution Approach 1:
The patent changes the material composition from silicone to hydrophobic polyacrylic ester, which has different chemical properties that reduce the tendency to form fibers and secondary cataracts while maintaining the required softness for accommodation function
3Measurement precision
If monofocal intraocular lens is used, then vision correction at conventional distance is provided, but vision correction at both far and close distances is not possible
Solution Approach 1:
The patent employs a dynamic accommodation mechanism where the soft optical lens moves back and forth within the capsular bag, allowing the focal point to shift between distance and near vision, providing adaptability for multiple viewing distances
Solution Approach 2:
The intraocular lens is designed to perform multiple functions: it provides vision correction at distance, intermediate, and near distances through accommodation, replacing the need for separate monofocal lens and reading glasses
4Adaptability or versatility
If multifocal intraocular lens is used, then vision at far, close and medium distances is available, but only a part of light at each distance is focused onto the optic nerve and side effects occur
Solution Approach 1:
The patent uses a dynamic accommodation mechanism where a single optical lens moves to change focal length, concentrating light focus on the optic nerve at different distances without the light division problems of multifocal lenses
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design allows for greater adjustable optical power and maintains multifocal functionality even if the back-and-forth movement is lost, offering improved vision correction across distances without the need for glasses and reducing the risk of secondary cataracts.
Implementation Method 1
The silicone connecting member (3) is located between the optical body (1) and the haptic (2), and connects the optical body (1) and the haptic (2) in an inserted manner through recesses and projections
Implementation Method 2
the optical lens focuses light onto the optic nerve to enable the optical lens to see the object
Data Source
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AI summary
Disclosed is a accommodative multifocal intraocular lens, including an optical body (1), a haptic (2) and a silicone connecting member (3), wherein the silicone connecting member (3) is located between the optical body (1) and the haptic (2), and combines the optical body (1) and the haptic (2) in an inserted manner through concave and convex grooves; two ends of the optical body (1) are provided with concave grooves (4); an end, joined to the optical body (1), of the haptic (2) is provided with a concave groove (5); two ends, along the width direction, of the silicone connecting member (3) are provided with convex grooves, respectively, that is, a convex groove (6) and a convex groove (7), respectively. The optical body in the present invention is a multi-focal optical zone, and the back-and-forth movement of the optical zone can effectively increase the change of the focal power of the multifocal lens.