Intraocular Lens Insertion Tool Transition Part Design
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Solution Overview
Problem
The complexity of designing and fabricating the luminal shape of transition parts in existing intraocular lens insertion devices makes them difficult to manufacture and assemble efficiently.
Innovation Solution
The device features a main body with a tapered transition part and a slider that includes rails to support the lens, allowing it to be folded into a predetermined shape by pivoting and deforming the lens edges, simplifying the design and manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a complex luminal shape transition part is used to fold the lens, then the lens can be folded into a predetermined shape, but the device becomes difficult to design and fabricate
Solution Approach 1:
The device is divided into distinct functional modules: a lens receiving chamber for storing the lens, a transition part with rails for guiding and folding the lens, and a nozzle for insertion. This segmentation allows each part to be designed and fabricated independently, simplifying manufacturing while achieving the required lens folding function.
Solution Approach 2:
Rails are introduced as an intermediary element between the lens receiving chamber and the nozzle. These rails guide the lens during its movement and folding process, replacing the need for a complex luminal shape transition part. The rails act as a mediator that simplifies the transition structure while ensuring proper lens deformation.
2Object-affected harmful factors
If the incision size is minimized to reduce corneal astigmatism and infection risk, then the lens must be folded into a smaller size, but this requires more complex folding mechanisms
Solution Approach 1:
The folding function is segmented and distributed along the transition part with rails, rather than requiring a single complex folding mechanism. The lens is gradually folded as it moves through the transition part, achieving size reduction suitable for small incisions while maintaining a relatively simple device structure.
Solution Approach 2:
The lens itself performs part of the folding action by being guided along the rails during its movement from the receiving chamber to the nozzle. This self-service approach reduces the need for additional active folding mechanisms, simplifying the device while achieving the required compact form for small incision insertion.
Data Source
Figure 1~2
Figure 3(A)~3(B)
Figure 4~5(B)
AI summary
An intraocular lens insertion device capable of folding an intraocular lens into a predetermined shape without giving a local stress to the intraocular lens. The intraocular lens insertion device 2 includes a lens disposing part 15 for disposing an intraocular lens 4, a slider 7 for pushing out the intraocular lens 4, a plunger 8 for further pushing out the intraocular lens pushed out by the slider 7, a transition part 31 for deforming the intraocular lens 4 pushed out by the slider and the plunger, and a nozzle 32 for ejecting out the deformed intraocular lens 4. The slider 7 includes a lens push-out part 47 having a larger contact area than the plunger 8 and a lens holder 52 holding one face of an optical part 4b of the intraocular lens 4 in one direction. The transition part 31 deforms a portion of an outer edge of the intraocular lens 4 parallel to the lens traveling direction in an other direction opposite to the one direction.