Accommodative Intraocular Lens with Detachable Membrane
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Solution Overview
Problem
Current accommodative intraocular lenses have complex structures, require complicated implantation, and often do not fit properly within the natural capsular bag due to size variations, resulting in limited accommodation range and the need for additional vision correction.
Innovation Solution
An accommodative intraocular lens design featuring a first lens part with an optic body and haptic, and a detachable second lens part with a flexible membrane and hollow cylinder, allowing for microincision implantation and adjustable refraction by changing the radius of curvature of the posterior membrane surface in response to ciliary muscle movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an accommodative intraocular lens is designed to enable accommodation with changing plane of focus, then vision correction capability is improved, but the structure becomes very complex and implantation becomes complicated
Solution Approach 1:
The intraocular lens is divided into two separate parts: a first lens part containing the optic body and haptic, and a second lens part containing the flexible membrane and hollow cylinder. This segmentation allows each part to be simpler in structure while collectively providing the accommodative function, resolving the contradiction between accommodation capability and structural complexity.
Solution Approach 2:
The second lens part is designed to be detachably coupled to the first lens part, with the hollow cylinder fitting into the capsular bag and the flexible membrane positioning within the optical path. This nested configuration enables compact integration of multiple functional elements without requiring a complex monolithic structure.
2Ease of manufacture
If an accommodative intraocular lens is designed with fixed size, then manufacturing is simplified, but it becomes too big or too small for existing capsular bags of different sizes
Solution Approach 1:
By dividing the lens into two implantable parts, the system can be adapted to different capsular bag sizes through selective combination of components. The first lens part with optic body can be implanted in all cases, while the second lens part can be adjusted or selected based on individual capsular bag dimensions, achieving both manufacturing simplicity and patient-specific adaptability.
Solution Approach 2:
The detachable coupling between the first and second lens parts introduces dynamic adaptability to the system. The configuration can be adjusted during implantation to match different capsular bag sizes, allowing the same basic design to serve multiple patient anatomies without requiring completely different lens designs.
3Adaptability or versatility
If the second lens part is detachably coupled to the first lens part, then implantation flexibility and adaptability are improved, but the device structure becomes more complex
Solution Approach 1:
The coupling mechanism is designed as a separate, specialized interface between the two lens parts rather than an integrated complex structure. By extracting the coupling function into a dedicated mechanical interface, the overall system achieves implantation flexibility while keeping each individual component relatively simple in design.
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
Facilitates a large accommodation range with a simple structure, suitable for various capsular bag sizes, enabling clear vision at different distances without additional corrective measures, and allows for precise adaptation to individual patients.
Implementation Method 1
a flexible membrane securely connected to the haptic or the optic body... wherein the membrane is arranged adjacent to the anterior optic body surface... and wherein the membrane has a center axis which extends congruent or parallel to the optical axis, wherein the posterior membrane surface has a radius of curvature and wherein the membrane is transparent to light
Implementation Method 2
a compressive force, which acts on a distal end of the hollow cylinder parallel to the optical axis and which is generable by a movement of the ciliary muscle of the eye, renders the hollow cylinder and the membrane displaceable along the optical axis in the direction to the anterior optic body surface and the posterior membrane surface experiences a change in the radius of curvature
Data Source
AI summary
An accommodative intraocular lens for implantation in an eye within a natural capsular bag includes a first lens part with an optical body transparent to light and defining an optical axis, front and rear optical body surfaces, haptics connected permanently to the optical body and designed to come into engagement with the capsular bag, a flexible membrane connected permanently to the haptics or the optical body, the membrane having a center axis which runs congruently or parallel to the optical axis and is transparent to light, and a second lens part with a hollow cylinder which can be positioned with a proximal end on the front membrane surface of the first lens part such that the hollow cylinder and the membrane can be displaced along the optical axis towards the front optical body surface and thus the rear membrane surface undergoes a change in the radius of curvature thereof.