Rigid Haptic Intraocular Lens Design
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Solution Overview
Problem
Current intraocular lenses often result in unpredictable post-operative uncorrected vision due to movement of the lens within the eye caused by the ciliary muscle, leading to issues like halos, glare, and reduced contrast sensitivity, especially with multifocal lenses, and inadequate distance, near, and intermediate vision with existing designs.
Innovation Solution
The development of non-accommodating intraocular lenses with rigid haptics connected to a foldable optic, where the rigid haptics are resistant to deformation by the ciliary muscle, ensuring the lens remains in a consistent position along the visual axis, and semi-rigid haptics that can be compressed for insertion but regain their shape to resist deformation, providing uncorrected vision at various distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multifocal lenses are used to treat presbyopia, then near and distance vision are improved, but halos, glare, and reduced contrast sensitivity occur due to multiple focal points
Solution Approach 1:
The patent extracts the problematic multifocal design and replaces it with a monofocal lens that provides a single sharp focal point. By eliminating the multiple focal points that cause halos and glare, the invention removes the harmful effects while still addressing the presbyopia issue through alternative means (such as monovision or refractive cylinder)
Solution Approach 2:
The invention changes the optical parameter from multifocal (multiple focal points) to monofocal (single focal point). This parameter change eliminates the optical interference that causes halos and glare, while the refractive cylinder component addresses the astigmatism aspect of presbyopia correction
2Adaptability or versatility
If accommodating lenses are designed to move forward upon ciliary muscle constriction, then near vision is improved, but distance vision accuracy deteriorates compared to multifocal lenses
Solution Approach 1:
The patent removes the accommodating mechanism (lens movement) that compromises distance vision accuracy. By extracting this problematic feature, the invention maintains a fixed monofocal lens position that ensures precise distance vision, while addressing near vision needs through the refractive cylinder and monovision approach
3Ease of operation
If the lens is made flexible to allow compression for insertion, then ease of implantation is improved, but position stability deteriorates due to ciliary muscle deformation
Solution Approach 1:
The patent applies local quality by making different parts of the lens system have different properties: the optic portion remains rigid and monofocal to maintain position stability and optical precision, while the haptic portions are designed with specific flexibility characteristics to enable compression for insertion but resist deformation from ciliary muscle action to maintain stable positioning
Solution Approach 2:
The invention uses composite construction with the optic made from rigid optical material (such as PMMA or acrylic) to maintain shape stability, while the haptics are made from biocompatible materials with controlled flexibility to allow insertion but resist muscle deformation, creating a composite structure that balances both requirements
4Stability of the object's composition
If rigid haptics are used to prevent deformation, then position stability is improved, but ease of insertion deteriorates due to inability to compress
Solution Approach 1:
The patent applies local quality by making different parts of the lens system have different properties: the optic portion remains rigid and monofocal to maintain position stability and optical precision, while the haptic portions are designed with specific flexibility characteristics to enable compression for insertion but resist deformation from ciliary muscle action to maintain stable positioning
Solution Approach 2:
The invention applies dynamics by designing the haptics to exhibit conditional mechanical behavior: they are flexible enough to allow compression during insertion but become sufficiently rigid in the implanted state to resist ciliary muscle deformation, achieving both ease of insertion and position stability through dynamic mechanical properties
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
This design enhances the predictability of post-operative uncorrected vision by maintaining the lens's position and resisting deformation, reducing complications associated with ciliary muscle action and fibrosis, thereby improving distance, near, and intermediate vision without glare or halos.
Implementation Method 1
semi-rigid haptics that can be compressed for insertion but regain their shape to resist deformation
Data Source
AI summary
An intraocular lens including a flexible optic and at least one rigid plate haptic connected to the optic. The at least one rigid plate haptic can include a rigid structure. The at least one rigid plate haptic can be resistant to bending from pressure exerted on a distal end of the at least one haptic by contraction of the ciliary muscle. The intraocular lens can be a non-accommodating IOL having a longitudinal length that is fixed and configured to resist deformation by the action of the ciliary muscle. Various embodiments also include accommodating intraocular lenses.