Intraocular Lens Haptic Joint Mechanism for Rotational Stability
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Solution Overview
Problem
Existing intraocular lenses lack sufficient rotational stability, particularly for toric lenses, which can lead to imaging errors if incorrectly oriented in the capsular bag during cataract treatment.
Innovation Solution
The intraocular lens features a haptic with a joint mechanism and a support projection that provides restoring force, allowing the lens to maintain high rotational stability by adjusting to the size of the capsular bag, with features such as film joints and varying stiffness to ensure proper positioning and fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional haptic design is used, then the lens can be inserted into the capsular bag, but rotational stability is insufficient leading to imaging errors
Solution Approach 1:
The haptic is divided into multiple segments (first arm, second arm, third arm) connected by joints (first joint, second joint, third joint). This segmentation allows each segment to move independently, enabling the haptic to adapt to the capsular bag while maintaining rotational stability through the coordinated movement of segmented components.
Solution Approach 2:
The haptic employs a dynamic joint mechanism that allows movement and adaptation rather than being rigid. The joints enable the haptic to dynamically adjust its configuration in response to forces from the capsular bag, maintaining optimal positioning and rotational stability through controlled motion rather than rigid fixation.
2Manufacturing precision
If the haptic is made more rigid to improve positioning stability, then positioning accuracy improves, but the lens cannot adapt to varying capsular bag sizes
Solution Approach 1:
The joint mechanism provides dynamic adaptation capability, allowing the haptic to change its configuration based on capsular bag size while maintaining precise positioning. The joints act as flexible connection points that accommodate size variations without compromising the accuracy of lens placement within the capsular bag.
Solution Approach 2:
The haptic's effective length and configuration can change through joint movement in response to capsular bag size variations. This parameter change allows the same haptic structure to adapt to different capsular bag dimensions while maintaining optimal positioning accuracy through the restored force mechanism.
3Reliability
If the first arm is made longer to increase contact surface with capsular bag, then rotational stability improves, but the joint mechanism complexity increases
Solution Approach 1:
The first arm is segmented into multiple sections connected by joints, which distributes the complexity across multiple simple joint mechanisms rather than requiring a single complex structure. This segmentation allows the arm to achieve sufficient contact surface area while maintaining manageable complexity through modular joint design.
Solution Approach 2:
The joint mechanism merges the functions of positioning, adaptation, and stabilization into a single integrated system. The first joint, second joint, and third joint work together as a unified mechanism that provides rotational stability through coordinated movement of the first arm, second arm, and third arm, reducing overall system complexity compared to separate mechanisms.
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 enhances rotational stability, ensuring accurate image formation on the retina by maintaining the lens's optimal orientation, even with varying capsular bag sizes, thereby reducing imaging errors.
Implementation Method 1
at least one of the second joint, the third joint and the fourth joint is arranged, a to exert restoring force when the joint gear is moved out of its rest position
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to an intraocular lens (1) with an optical body (2) and a haptic (3) comprising a joint mechanism (20) comprising a first arm (5a) forming the radially outer part of the haptic (3) and a first longitudinal end (11) and a second longitudinal end (12), a first joint (6a) arranged at a position between the first longitudinal end (11) of the first arm (5a) and the second longitudinal end (12) of the first arm (5a) and by means of which the first arm (5a) is pivotably coupled to the optical body (2), a second arm (5b), a third arm (5c), a second joint (6b), a third joint (6c) and a fourth joint (6d), wherein the second joint (6b) is arranged at the second longitudinal end (12) of the first arm (5a) and at a first longitudinal end (14) of the second arm (5b) and the first arm (5a) pivotable with the second arm (5b) coupled,the third joint (6c) is arranged at a second longitudinal end (15) of the second arm (5b) and at a first longitudinal end (16) of the third arm (5c) and pivotably couples the second arm (5b) to the third arm (5c), the fourth joint (6d) is arranged at a second longitudinal end (17) of the third arm (5c) and pivotably couples the third arm (5c) to the optical body (2), and at least one of the second joint (6b), the third joint (6c), and the fourth joint (6d) is configured to exert a restoring force when the joint mechanism (20) is moved from its rest position.