Accommodating Intraocular Lens with Biasing Capsule Expander
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Solution Overview
Problem
Conventional accommodating intraocular lenses fail to accurately transmit the contraction and relaxation of ciliary muscles to the lens capsule, leading to inadequate accommodation function and a high risk of secondary cataract formation due to insufficient tension in Zinn's zonules and adherence of the anterior and posterior capsules.
Innovation Solution
An accommodating intraocular lens with an elastically deformable optical portion and a lens capsule expanding device featuring a front supporting portion, a rear supporting portion, and a connecting portion that applies biasing force to separate these components, allowing for accurate transmission of muscle contractions and preventing capsule adherence by exposing the lens equator to hydatoid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional accommodating intraocular lenses are used, then the lens capsule can be expanded, but the contraction and relaxation of ciliary muscles cannot be accurately transmitted to the lens capsule, resulting in inadequate accommodation function
Solution Approach 1:
The lens capsule expanding device is divided into a front supporting portion, rear supporting portion, and connecting portion. This segmentation allows each part to perform specific functions: the front and rear supporting portions contact the lens capsule to expand it, while the connecting portion transmits the contraction and relaxation of ciliary muscles to the lens capsule with high accuracy, resolving the contradiction between expansion capability and transmission precision.
Solution Approach 2:
The connecting portion acts as an intermediary element between the ciliary muscles and the lens capsule. It accurately transmits the contraction and relaxation forces from the ciliary muscles to the lens capsule, enabling precise accommodation function while maintaining the expansion capability of the lens capsule.
2Reliability
If conventional accommodating intraocular lenses are used, then the lens capsule can be expanded, but Zinn's zonules lack sufficient tension, leading to high risk of secondary cataract formation
Solution Approach 1:
The device is segmented into front supporting portion, rear supporting portion, and connecting portion. The front supporting portion contacts the anterior capsule and the rear supporting portion contacts the posterior capsule, creating a structure that maintains sufficient tension in Zinn's zonules while preventing capsule adherence, thus reducing secondary cataract risk.
Solution Approach 2:
The connecting portion continuously maintains tension in Zinn's zonules by constantly transmitting the contraction and relaxation of ciliary muscles to the lens capsule. This continuous action prevents capsule adherence and reduces the risk of secondary cataract formation.
3Ease of operation
If conventional accommodating intraocular lenses are used, then the lens capsule can be expanded, but the anterior and posterior capsules adhere to each other, blocking the lens equator
Solution Approach 1:
The device divides the lens capsule expansion into two independent supporting portions (front and rear) connected by a connecting portion. This segmentation prevents the anterior and posterior capsules from adhering to each other by maintaining physical separation and continuous tension, ensuring the lens equator remains accessible.
Solution Approach 2:
The connecting portion continuously maintains tension and physical separation between the anterior and posterior capsules, preventing them from adhering to each other. This continuous action ensures the lens equator remains accessible for hydatoid flow and prevents capsule blockage.
4Device complexity
If monofocal lenses are used, then the lens structure is simple, but the accommodation power is lost and cannot be restored
Solution Approach 1:
The patent employs an elastically deformable optical portion that can dynamically change its shape in response to the contraction and relaxation of ciliary muscles. This dynamic structure restores accommodation power by allowing the optical portion to deform and refract light differently, while maintaining a relatively simple overall lens structure.
Solution Approach 2:
The optical portion's elastic deformability allows it to change its physical parameters (shape, curvature) in response to mechanical forces from ciliary muscle contraction and relaxation. This parameter change enables the restoration of accommodation power while keeping the lens structure simple.
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 solution enables precise accommodation function and reduces the occurrence of secondary cataracts by maintaining moderate tension in Zinn's zonules and preventing lens epithelial cell growth, thereby enhancing visual clarity and stability post-surgery.
Implementation Method 1
a connecting portion connecting the front supporting portion and the rear supporting portion in such a manner as to have biasing force in a direction of separating the front supporting portion and the rear supporting portion from each other
Implementation Method 2
an optical portion which is elastically deformable... force is applied directly or indirectly from the connecting portion according to movement of the connecting portion when the front supporting portion and the rear supporting portion move in a direction closer to or away from each other with movement of the lens capsule whereby a curvature of the optical portion is changed
Implementation Method 3
the Zinn's zonules positioned between the ciliary bodies C and the lens equators Se... the ciliary bodies C are at positions retracted in a direction away from the lens capsule S... relatively strong tension is generated in the Zinn's zonules Z
Data Source
AI summary
An intraocular lens includes a lens capsule expanding device and an optical portion. The lens capsule expanding device includes a front supporting portion to make contact with an inner surface of an anterior capsule. A rear supporting portion provided on a rear side of the front supporting portion makes contact with an inner surface of a posterior capsule while facing the front supporting portion. A connecting portion connects the front supporting portion and the rear supporting portion so as to have biasing force in a direction of separating the front supporting portion and the rear supporting portion from each other. Due to the biasing force, the front supporting portion presses the inner surface of the anterior capsule and the rear supporting portion presses the inner surface of the posterior capsule. The optical portion changes the curvature of a central portion according to movement of the connecting portion.