Phakic Intraocular Lens With Central Diffraction Grating
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Solution Overview
Problem
Conventional phakic intraocular lenses with central holes suffer from impaired optical performance due to thickness and are prone to iris blockage when holes are not centered, hindering aqueous humor flow.
Innovation Solution
A phakic intraocular lens with a diffraction grating in the central part, featuring circular, coaxial grooves and a support part outside the grating, allowing a central hole for aqueous humor flow while maintaining optical performance through optimized groove intervals and serrated portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a hole is formed in the central part of a convex lens, then lens thickness is reduced, but optical performance is impaired
Solution Approach 1:
The patent applies parameter changes by transitioning from a conventional convex lens structure to a diffractive lens structure. The diffractive grating with circular grooves creates optical path differences that enable focusing functionality without requiring the thickness of a traditional convex lens. This parameter change in the optical mechanism allows central hole formation while maintaining optical performance.
Solution Approach 2:
The patent replaces the mechanical refractive system (convex lens shape) with a diffractive optical system (grating structure). Instead of relying on the mechanical thickness of a convex lens to achieve focusing, the invention uses the diffractive grating pattern to control light paths, enabling thickness reduction without sacrificing optical function.
2Length of stationary object
If a hole is formed at the periphery part of the lens, then lens thickness can be reduced, but aqueous humor flow is hindered due to iris blockage
Solution Approach 1:
The patent employs asymmetry in the optical design by placing the diffractive grating in the central region rather than distributing optical power uniformly. This asymmetric arrangement allows the central hole to remain unobstructed by the iris while the diffractive elements positioned outward from the center provide the necessary optical function.
Solution Approach 2:
The patent transitions from a two-dimensional thickness reduction approach to a three-dimensional spatial arrangement. By positioning the diffractive grating in the central region and arranging grooves in specific patterns, the invention creates spatial separation between the hole (for fluid flow) and the optical elements, resolving the conflict between thickness reduction and fluid flow maintenance.
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 solution reduces lens thickness, enables unobstructed aqueous humor flow, and preserves optical performance by forming a single focal point, facilitating the implantation and functionality of the lens.
Implementation Method 1
a diffraction grating disposed in a central part of the lens, the diffraction grating having circular, coaxial grooves formed thereon
Implementation Method 2
preserves optical performance by forming a single focal point
Data Source
AI summary
The present invention is a phakic intraocular lens for implantation between an iris and a crystalline lens. The phakic intraocular lens includes a diffraction grating 5 disposed in a lens central part 2 and having circular, coaxial grooves formed thereon, and a support part 3 disposed outside the diffraction grating 5 and supporting the diffraction grating 5. A hole 6 is formed in the center of the diffraction grating 5.