Multi-element accommodating intraocular lens with rigid posterior translation member
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Solution Overview
Problem
Conventional accommodating intraocular lenses (AIOLs) have design assumptions that are proven incorrect, leading to insufficient translation of anterior and posterior lens elements, resulting in reduced accommodative ability and near vision requirements for patients.
Innovation Solution
A multi-element AIOL design with a posterior translation member that is more rigid than the anterior portion, featuring bias elements with specific resistance to bending, allowing for greater pinching action by the capsular bag and enhanced translation of the lenses during accommodation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional AIOL designs assume the capsular bag remains pliable and allows substantial axial compression of bias elements, then the lens elements can translate to achieve accommodation, but the actual translation is insufficient because the capsular bag shrinkage is greater than assumed and the bias elements are not pinched adequately
Solution Approach 1:
The patent changes the mechanical parameters of the bias elements by making the posterior translation member more rigid than the anterior portion. This parameter change allows the bias elements to better resist capsular bag shrinkage while still permitting adequate axial compression and pinching action during accommodation, thereby achieving reliable and sufficient lens element translation.
Solution Approach 2:
The bias element is segmented into an anterior translation member and a posterior translation member with different rigidity characteristics. The anterior portion remains more flexible to allow capsular bag interaction, while the posterior portion is more rigid to maintain structural integrity and provide effective pinching action, resolving the contradiction between flexibility and reliability.
2Stability of the object's composition
If the posterior translation member is made more rigid to resist capsular bag shrinkage, then the lens can maintain its position better, but the translation capability during accommodation may be reduced
Solution Approach 1:
The bias element is designed with non-uniform rigidity distribution along its length. The posterior translation member has higher rigidity to resist capsular bag shrinkage and maintain structural stability, while the anterior translation member maintains lower rigidity to facilitate smooth translation during accommodation. This local differentiation of mechanical properties resolves the contradiction between stability and ease of operation.
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 effectively resists capsular bag shrinkage and tension, enabling greater translation of the lenses, thereby improving accommodative ability and reducing the need for additional vision correction measures.
Implementation Method 1
The first posterior translation member has a resistance to bending such that, at a point disposed at least 75% of the distance from the optical axis to the radially outermost location of the first bias element, a force of 0.1 mN causes less than 0.2 mm of displacement
Implementation Method 2
the capsular bag will remain pliable such that substantial axial compression of the bias elements will occur due to pinching of the capsular bag on the bias elements
Data Source
AI summary
A multi-element accommodating intraocular lens (AIOL) having a first anterior translation member and a first posterior translation member coupled together to form a first bias element. The first posterior translation member has a greater resistance to bending than the first anterior translation member. The first posterior translation member has a greater thickness than the first anterior translation member.