Multicomponent Intraocular Lens Asymmetric Haptic Design
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Solution Overview
Problem
Multicomponent intraocular lenses (MC-IOLs) face difficulties in rotation and axis orientation due to the circular shape of haptics, which fail to provide resistance within the capsular bag, leading to improper lens alignment and potential tension on the capsulorhexis.
Innovation Solution
The design incorporates a base component with a haptic and a front component featuring a resilient projection that engages a retaining member, creating tensile stress in the capsular bag to secure the lens firmly, allowing for proper orientation and fixation within the capsular bag, enabling rotation and adjustment of the MC-IOL during surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the haptic is designed with a circular shape to fit the capsular bag, then the lens can be easily implanted, but the lens rotates away from its intended axis due to lack of resistance
Solution Approach 1:
The patent applies asymmetry by changing the haptic shape from circular to non-circular (e.g., D-shaped, J-shaped, or with asymmetric features). This asymmetric geometry provides resistance against rotation while maintaining ease of implantation, as the asymmetric shape can still be inserted through the incision but resists rotating away from the intended axis due to the capsular bag's geometric constraints.
2Stability of the object's composition
If the front component is attached to the base component with a rigid connection, then the lens structure is stable, but the lens cannot be adjusted or exchanged after implantation
Solution Approach 1:
The patent applies dynamics by using a dynamic attachment mechanism between the front component and base component. The attachment allows the lens to be securely fixed during implantation (providing stability) but can be detached or adjusted later through surgical intervention (providing adaptability). This dynamic connection enables the lens to transition from a fixed state to a modifiable state.
Solution Approach 2:
The patent applies segmentation by dividing the intraocular lens into separate components (front component and base component) that can be independently manipulated. The front component can be attached to or detached from the base component, allowing for post-implantation adjustments or exchanges while maintaining structural stability when attached.
3Device complexity
If the lens is designed as a single component, then the structure is simple, but adjustments or modifications require removing and re-implanting the entire lens
Solution Approach 1:
The patent applies segmentation by dividing the intraocular lens into separate components (front component and base component) that can be independently manipulated. The front component can be attached to or detached from the base component, allowing for post-implantation adjustments or exchanges while maintaining structural stability when attached.
Solution Approach 2:
The patent applies universality by designing a modular system where the base component serves as a universal platform that can accommodate different front components. This multi-functionality allows the same base component to be used with various optical designs, enabling adjustments and modifications without removing the entire lens system.
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 enhances the stability and rotational stability of the MC-IOL, allowing for precise axis orientation and adjustment, reducing the risk of capsulorhexis tension and facilitating easier surgical manipulation.
Implementation Method 1
a portion of the resilient projection has a back surface which is located backwards from a front surface of the haptic of the base component in the thickness direction of the base component
Data Source
AI summary
A multicomponent intraocular lens implantable in an optical system of a human eye, comprising: a base component and a front component, the front component comprising an attachment tab which extends from a circumferential side of the optical portion of the front component and engages the flange for attaching the front component to the base component, wherein the attachment tab of the front component comprises a resilient projection that protrudes away from the optical portion beyond the flange, wherein a portion of the resilient projection is located at a non-overlapping position with respect to the haptic of the base component in a circumferential direction around the optical portions, wherein the portion of the resilient projection has a back surface which is located backwards from a front surface of the haptic of the base component in the thickness direction of the base component.