Accommodative Intraocular Lens Capsule Movement Amplification
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Solution Overview
Problem
Accommodative intraocular lenses exhibit weak focus adjustment functions due to their inability to effectively capture and amplify the minute movements of the lens capsule caused by ciliary muscle contraction and relaxation, limiting their ability to provide practical focus adjustment from reading to driving without glasses.
Innovation Solution
The design incorporates an optical portion supported by anterior and posterior support portions that press against the inner surfaces of the anterior and posterior capsules, respectively, using elastic forces to deflect and move the optical portion significantly in response to changes in capsule movement, with notches and regulating members enhancing the deflection mechanism to amplify minute capsule movements into larger optical movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the support portion is made to deflect in response to lens capsule movement, then the optical portion can move in the anterior-posterior direction to provide focus adjustment, but the focus adjustment function becomes weak due to insufficient amplification of minute capsule movements
Solution Approach 1:
The support portion is designed with a curved configuration that enables dynamic deflection in response to lens capsule movement. The curved shape allows the support portion to convert minute capsule movements into larger optical portion movements through mechanical amplification, achieving practical focus adjustment strength while maintaining ease of operation.
Solution Approach 2:
The support portion utilizes the curved geometry to transform movement in one dimension (lens capsule movement) into movement in another dimension (anterior-posterior movement of optical portion). This dimensional transformation amplifies the effect of minute capsule movements, resolving the contradiction between ease of operation and focus adjustment strength.
2Reliability
If the anterior support portion is made to press against the anterior capsule to amplify movement, then the optical portion can achieve larger movement for focus adjustment, but the structural complexity increases
Solution Approach 1:
The support portion is segmented into an anterior support portion and a posterior support portion, each pressing against different capsule surfaces. This segmentation allows independent optimization of each portion's pressing action, achieving strong focus adjustment while keeping each individual portion's structure relatively simple.
Solution Approach 2:
The support portion employs a curved configuration that naturally amplifies movement through geometric leverage. The curved shape enables the anterior support portion to press against the anterior capsule effectively, converting small movements into larger optical portion movements without requiring complex mechanical structures.
3Ease of operation
If the support portion presses against the capsule to maintain radial position during deflection, then the focus adjustment function is enhanced, but the elastic force requirements increase
Solution Approach 1:
The support portion is designed with appropriate elastic properties to dynamically press against the capsule during deflection. The elastic force is optimized to maintain radial position during movement while providing sufficient amplification effect, balancing the requirements for focus adjustment function and elastic force requirements.
Solution Approach 2:
The material and geometric parameters of the support portion are optimized to achieve the right balance between elastic force and movement amplification. By adjusting parameters such as curvature radius, thickness, and material elasticity, the support portion can maintain radial position during deflection without requiring excessive elastic force.
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 configuration enables a practical focus adjustment function by amplifying minute lens capsule movements into larger optical movements, achieving a focus adjustment force of 1 diopter or more, sufficient for tasks from reading to vehicle operation, with the support portions maintaining their radial position during deflection.
Implementation Method 1
The support portion is composed of an anterior support portion which presses the anterior capsule and a posterior support portion which presses the posterior capsule by an elastic force of the support portion
Data Source
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AI summary
It is an object of the present invention to provide an accommodative intraocular lens capable of effectively exerting a focus adjustment function. An optical portion 10 and a plurality of support portions 20 arranged around the optical portion 10 are provided. The support portion 20 includes an anterior support portion 21 and a posterior support portion 22, and the anterior support portion 21 presses an anterior capsule Sf and the posterior support portion 22 presses a posterior capsule Sb by the elastic force of the support portion 20. When the lens capsule S is in a distance vision state or in a near vision state, as the pressing force of the anterior capsule Sf against the anterior support portion 21 increases or decreases, the anterior support portion 21 deflects backward or returns forward while maintaining the radial position of the base end portion 21a, so that the tip end portion 21b of the anterior support portion 21 moves backward or forward greatly while maintaining the radial position, and the optical portion 10 moves backward or forward accordingly.