Accommodative Intraocular Lens Haptic Plate Design
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Solution Overview
Problem
Conventional accommodating intraocular lenses (AIOLs) that contact the posterior capsular bag along only a portion of the posterior capsule fail to utilize the full movement of the vitreous body for accommodative movement, leading to herniation of the capsular bag.
Innovation Solution
An AIOL design featuring a haptic plate that surrounds the optic on all sides (360 degrees) with a combined surface area of 80 mm^2 to 100 mm^2, providing a continuous boundary to limit bulging of the vitreous body and enhance accommodative movement by covering a substantial portion of the posterior capsule.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional AIOLs contact the posterior capsular bag along only a portion of the posterior capsule, then the device complexity is reduced, but the capsular bag herniates around the lens and fails to utilize full vitreous body movement for accommodation
Solution Approach 1:
The haptic plate is divided into multiple segments or zones that contact different portions of the posterior capsule. This segmentation allows the plate to distribute contact points across the posterior capsule surface, preventing localized herniation while maintaining structural integrity and enabling full utilization of vitreous body movement for accommodation.
2Reliability
If the haptic plate surrounds the optic on all sides (360 degrees), then the accommodative movement effectiveness is improved by utilizing full vitreous body movement, but the device complexity increases
Solution Approach 1:
Multiple haptic elements are merged into a single continuous haptic plate that surrounds the optic on all sides. This merging creates a unified structure that distributes contact across the posterior capsule, preventing herniation and maximizing accommodation effectiveness while simplifying the overall device architecture compared to separate haptic elements.
Solution Approach 2:
The haptic plate serves multiple functions simultaneously: it provides structural support, distributes contact forces across the posterior capsule, prevents herniation, and transmits vitreous body movement to the optic for accommodation. This multi-functionality reduces the need for separate components, effectively managing device complexity while achieving superior accommodative movement.
3Reliability
If the haptic plate covers a substantial portion of the posterior capsule, then capsular bag herniation is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The haptic plate incorporates local variations in thickness, rigidity, or contact surface area at different zones. This local quality variation allows the plate to adapt to the posterior capsule geometry, distributing contact forces optimally to prevent herniation while reducing the stringency of uniform manufacturing precision requirements across the entire structure.
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 reduces herniation and increases the effectiveness of vitreous body movement for accommodative purposes, allowing for improved near vision focus without the need for additional corrective measures like spectacles or contact lenses.
Implementation Method 1
the elasticity of the posterior capsule
Implementation Method 2
pressure in the vitreous cavity
Implementation Method 3
increasing vitreous cavity pressure in such a way as to effect forward movement of the lens
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
An accommodating intraocular lens (AIOL) comprising an optic, and at least one haptic plate coupled to the optic by at least one connector, the connector being less rigid than the haptic plate, the at least one haptic plate surrounding the optic, and the optic and haptic plate having a combined surface area between 80 mm2 and 100 mm2. The at least one haptic plate may form a continuous 360-degree boundary around the optic.