Multi-piece IOL Assembly for Positional Stability
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Solution Overview
Problem
Current intraocular lens (IOL) systems face challenges with positional stability, leading to residual refractive errors due to rotation, axial displacement, tilt, and decentration, which are exacerbated by the limitations of existing IOL designs and implantation methods that restrict the size of IOLs that can be safely inserted, thereby constraining optical zone diameter and central thickness.
Innovation Solution
A multi-piece IOL assembly is introduced, comprising a platform and an optic, where the platform is configured to couple with the inner periphery of the eye, and the optic is secured to the platform using a retention mechanism, allowing for adjustable positioning and enhanced stability through photobonding or other bonding techniques, enabling larger IOLs to be implanted without excessive trauma and facilitating better optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If larger IOLs are implanted to provide more functionality and better optical performance, then optical zone diameter and central thickness are improved, but incision size and surgical trauma increase
Solution Approach 1:
The IOL is divided into multiple segments or pieces that can be inserted separately through smaller incisions. The segments are then assembled within the capsular bag to form the complete larger IOL, allowing implantation of IOLs with larger optical zones without requiring proportionally larger incisions.
Solution Approach 2:
The IOL segments are designed to nest within each other or within the injection device during insertion. The segments are compacted or folded in a nested configuration to pass through small incisions, then deployed to their full size within the capsular bag to achieve the desired large optical zone.
2Device complexity
If traditional single-piece IOLs are used, then implantation is simpler, but positional stability is poor leading to rotation, tilt, and decentration
Solution Approach 1:
The IOL is segmented into multiple pieces with distinct functional regions. The platform segment provides stable fixation to the capsular bag, while the optic segment provides optical function. This segmentation allows independent optimization of stability features without compromising optical performance.
Solution Approach 2:
The IOL design incorporates dynamic adjustment capabilities where the optic can be positioned and secured at optimal locations on the platform. The retention mechanisms allow for fine-tuning of the optic's position to achieve最佳的 centration and tilt, improving positional stability while maintaining implantation simplicity.
3Force
If IOLs are fixated by applying force in the inner part of the capsular bag, then fixation is achieved, but positional stability remains insufficient due to rotation and axial displacement
Solution Approach 1:
The fixation function is separated into dedicated platform segments with specialized retention mechanisms. These platform segments engage with the capsular bag through mechanical interlocking features that distribute fixation forces across multiple attachment points, preventing rotation and axial displacement more effectively than traditional single-point fixation.
Solution Approach 2:
The retention mechanism extends fixation from a single dimension to multiple dimensions by incorporating features that resist rotation (angular stability), axial displacement (longitudinal stability), and lateral movement (radial stability). This multi-dimensional fixation approach comprehensively addresses positional stability issues.
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 solution improves positional stability and optical performance by allowing for adjustable positioning of the optic within the eye, reducing refractive errors and enabling the implantation of larger IOLs without increasing incision size, thus minimizing surgical complications and enhancing post-operative vision correction.
Implementation Method 1
allowing for adjustable positioning and enhanced stability through photobonding or other bonding techniques
Data Source
AI summary
A multi-piece IOL assembly is provided that includes a platform and an optic. The platform has an inner periphery surrounding an inner zone of the platform. The optic has an optical zone, an outer periphery and a retention mechanism disposed on the outer periphery. The optic is configured to be disposed in the inner zone of the platform and to extend to a location between the inner periphery and the outer periphery of the platform to be secured to the platform at the location. The platform can be secured to an inner periphery of the eye or can be formed into a natural lens by cutting the lens using a laser or other energy source.