Adjustable Intraocular Lens Haptic for Capsular Bag Stability
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Solution Overview
Problem
Existing intraocular lenses face challenges in achieving stable positioning within capsular bags of varying sizes, leading to issues such as tilting and rotation, which can cause visual impairments.
Innovation Solution
An intraocular lens design featuring a strand-like bracket haptic with a length-changing device, allowing adjustable length adjustment in defined increments or continuously, ensuring precise fitting to the capsular bag size and preventing unwanted tilting and rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed-length haptics are used in intraocular lenses, then the lens structure is simple and easy to manufacture, but the lens cannot be stably positioned in capsular bags of varying sizes, leading to tilting and rotation
Solution Approach 1:
The haptic incorporates a length-changing device that allows the haptic arm to adjust its length dynamically. This dynamic adjustment capability enables the haptic to adapt to different capsular bag sizes, ensuring stable positioning without requiring multiple fixed-length haptic designs, thus resolving the contradiction between positioning reliability and device complexity.
Solution Approach 2:
The haptic structure includes mechanisms (such as telescopic sections or expandable elements) that change the physical parameter of length. By varying the haptic length according to the specific capsular bag size, the system achieves reliable positioning across different anatomical variations while maintaining a single versatile haptic design rather than multiple fixed designs.
2Manufacturing precision
If fixed-length haptics are used, then manufacturing is simpler, but positioning precision in capsular bags of different sizes deteriorates
Solution Approach 1:
The adjustable-length haptic allows for precise adaptation to the specific dimensions of the patient's capsular bag during implantation. This dynamic length adjustment enables high implantation precision for each individual case while using a single haptic design, avoiding the need to manufacture multiple fixed-length variants.
Solution Approach 2:
The haptic design serves multiple functions: it can be adjusted to fit various capsular bag sizes, providing both small and large bag accommodation capabilities from a single device. This multi-functionality achieves high implantation precision across different anatomical conditions without requiring separate specialized haptics for each size category.
3Adaptability or versatility
If adjustable-length haptics are implemented, then adaptability to different capsular bag sizes improves, but device complexity increases
Solution Approach 1:
The haptic structure employs nested or telescopic elements where one section is contained within another, allowing length adjustment through extension or retraction. This nesting approach provides adaptability to different capsular bag sizes while keeping the overall structural complexity manageable through space-efficient design.
Solution Approach 2:
The haptic is divided into segmented sections that can move relative to each other, with the length-changing device creating distinct functional zones. This segmentation allows independent adjustment of haptic length while maintaining structural integrity, achieving versatility without excessive complexity.
Data Source
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AI summary
The invention relates to an intraocular lens (1) comprising an optical part (2), a haptic (5) which is coupled to the optical part (2), and an optical main axis (A) which passes through a front face (3) and a rear face (4) of the optical part (2), wherein the haptic (6) has at least one first haptic part (7) which is formed as a strand-like arm (8), and the strand-like arm (8) has a longitudinal axis (B). The strand-like arm (8) has at least one length adjusting device (11, 12), by means of which the length of the strand-like arm (8) can be adjusted in a defined manner in the direction of the longitudinal axis (B).