Accommodating Intraocular Lens With Fluid-Shaped Aspherical Optics
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Solution Overview
Problem
Existing fluid-driven accommodating intraocular lenses often suffer from issues such as astigmatism and unpredictable optical quality during accommodation due to inadequate design of the haptic and optic elements, which can lead to undesired shifts in lens power.
Innovation Solution
The design incorporates an aspherical configuration for the anterior and posterior elements of the intraocular lens, achieved by deforming these elements from a spherical to an aspherical shape using fluid pressure within the optic chamber, and includes a dual-channel buttress structure in the posterior element to enhance stability and reduce astigmatism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If spherical configuration is used for anterior and posterior elements, then manufacturing is simpler, but optical quality and predictability of lens power changes deteriorate
Solution Approach 1:
The anterior and posterior elements are pre-formed with spherical configurations during manufacturing, which simplifies the fabrication process. Subsequently, fluid pressure is applied in situ to deform these spherical elements into the required aspherical configurations, achieving both manufacturing simplicity and optical precision
Solution Approach 2:
The optical parameters of the lens elements are dynamically changed by applying fluid pressure, which deforms the spherical elements into aspherical shapes. This parameter change enables the lens to achieve different refractive powers while maintaining manufacturing simplicity
2Manufacturing precision
If fluid pressure is increased to achieve aspherical configuration, then optical quality improves, but device complexity increases
Solution Approach 1:
The haptic structure is merged with the optic elements to form an integrated accommodating intraocular lens. The haptic serves dual functions: supporting the optic and delivering fluid pressure to deform the spherical elements into aspherical configurations, thereby reducing overall device complexity
Solution Approach 2:
The haptic is designed with multi-functionality, serving both as a structural support element and as a fluid delivery mechanism. This universal design reduces the number of separate components needed, simplifying the overall device while enabling aspherical configuration
3Reliability
If dual-channel buttress structure is added to posterior element, then astigmatism is reduced, but manufacturing complexity increases
Solution Approach 1:
The posterior element is segmented into multiple functional regions, including dual-channel buttress structures. These segmented features provide targeted structural support and astigmatism reduction while maintaining manufacturability through modular design
Solution Approach 2:
The dual-channel buttress structure introduces asymmetric features in the posterior element to counteract astigmatism. The asymmetric design is integrated into the manufacturing process, allowing precision optical performance without excessive manufacturing complexity
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 aspherical configuration and dual-channel buttress design maintain optical quality and predictability of lens power changes during accommodation, reducing astigmatism and ensuring consistent optical performance across different states.
Implementation Method 1
changing the shape of the at least one of the anterior element and the posterior element from the spherical configuration to an aspherical configuration comprises adding fluid to the optic fluid chamber so as to increase the fluid pressure within the optic chamber and cause the at least one of the anterior element and the posterior element to deform from the spherical configuration to the aspherical configuration
Data Source
AI summary
An intraocular lens is disclosed that includes an optic body with a projection extending radially outwards from a peripheral surface of the optic body. The projection comprises a haptic contact surface facing radially outward, wherein the entire haptic contact surface is a flat surface. A haptic having a free distal end and a proximal portion is secured to the projection along the haptic contact surface, wherein the projection and the proximal portion interface at a butt joint without the haptic extending into the projection and without the projection extending into the haptic. The haptic also includes a haptic fluid chamber.