Intraocular Lens Plate Haptic Segmentation for Centration
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Solution Overview
Problem
Current accommodating intraocular lenses often require reading glasses for prolonged reading due to inadequate optic movement in response to vitreous cavity pressure changes, and they can tilt or become dislocated, affecting vision quality.
Innovation Solution
A flat, longitudinal intraocular lens design with distinct separate plate haptics that are rigid longitudinally and have a weakened transverse hinge, featuring multiple narrow hinges and lateral extensions to stabilize the optic and enhance movement, preventing tilt and ensuring proper centration within the capsular bag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the transverse hinge is weakened by elongating the hinge base or reducing the width of the hinge to increase optic movement, then the optic can move more in response to vitreous cavity pressure changes, but the lens optic becomes destabilized and prone to tilting
Solution Approach 1:
The single transverse hinge is divided into multiple narrow hinges (at least two separate spaced apart narrow hinges on each edge of the plate haptics). This segmentation allows the optic to move more freely in response to pressure changes while the distributed hinge structure provides better stability and prevents tilting compared to a single wide hinge.
Solution Approach 2:
The hinge structure has non-uniform properties: the hinges are narrow and spaced apart to allow movement, while the plate haptics themselves are made rigid longitudinally and extended laterally to provide stability. This local differentiation of properties (flexible hinge regions vs. rigid plate regions) resolves the contradiction between movement and stability.
2Adaptability or versatility
If plate haptics are made flexible to allow optic movement, then accommodation function is improved, but the lens can deform to a Z dislocated shape and become unstable
Solution Approach 1:
The plate haptics have different mechanical properties in different directions: they are rigid longitudinally (along the length) to prevent Z-dislocation and maintain stability, but have weakened transverse hinges that allow movement for accommodation. This anisotropic design simultaneously achieves adaptability and reliability.
Solution Approach 2:
The plate haptics are designed to be dynamic in the transverse direction (allowing movement through weakened hinges) while remaining static/rigid in the longitudinal direction. This selective dynamics enables accommodation function while preventing destabilizing deformations.
3Device complexity
If the lens design uses a single optic without attachments, then the lens structure is simple, but the lens frequently de-centers and requires haptics for centering and fixation
Solution Approach 1:
The lens is segmented into a simple optic and separate plate haptic attachments. This segmentation allows the optic itself to remain simple while the plate haptics provide the necessary centering and fixation functions through their rigid longitudinal structure and capsular bag engagement.
Data Source
AI summary
An intraocular lens for insertion into a capsular bag of an eye comprises: an optic; and at least one plate haptic coupled to the optic by one or more flexible connecting members. The plate haptic with projections which are designed to engage the periphery of the capsular bag to center and fixate the intraocular lens within. The haptic includes a longitudinally rigid frame to resist deformation of the haptic.