Intraocular Lens Injector Retainer for Accurate Haptic Tucking
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Solution Overview
Problem
The existing method for folding intraocular lenses during cataract surgery can cause the forward support portion to enter between the optical portion and the inner wall of the injector, necessitating manual correction by the surgeon, which is burdensome.
Innovation Solution
An intraocular lens injector with a protrusion that temporarily retains the forward support portion, delaying its movement relative to the optical portion, using a retainer to suppress bending and adjust the timing of the support portion's advancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the intraocular lens is advanced to fold the forward support portion rearward using a protrusion, then the lens can be folded for injection through a smaller incision, but the forward support portion may enter between the optical portion and the inner wall of the injector, requiring manual correction by the surgeon
Solution Approach 1:
A retainer structure is introduced as an intermediary component between the protrusion and the forward support portion. The retainer temporarily holds the forward support portion in a bent state during advancement, preventing it from entering between the optical portion and the injector wall, thus eliminating the need for manual correction while maintaining the folding capability
Solution Approach 2:
The retainer performs preliminary action by pre-positioning and temporarily constraining the forward support portion in the correct folded state before the lens is fully advanced. This preliminary control prevents the support portion from deviating into harmful positions, ensuring accurate tacking without requiring subsequent manual intervention
2Productivity
If the forward support portion is allowed to bend continuously during lens advancement, then the folding process is simple, but the timing of support portion movement coincides with optical portion advancement, causing the support portion to contact the inner wall
Solution Approach 1:
The folding process is segmented into distinct phases: initial bending by the protrusion, temporary retention by the retainer, and final positioning. This segmentation decouples the timing of support portion movement from optical portion advancement, allowing the support portion to be held in the correct position without interfering with the optical portion's progression, thus achieving both speed and precision
Solution Approach 2:
The retainer provides dynamic control by temporarily constraining the forward support portion during a critical phase of advancement and then releasing it at the appropriate time. This dynamic adjustment allows the system to maintain high injection speed while ensuring precise tacking positioning, as the retainer is only active during the specific moment when timing coordination is critical
Data Source
AI summary
There is provided an intraocular lens injector for improving accuracy of tacking, which is an intraocular lens injector 1 for injecting an intraocular lens 4 into an eye, the intraocular lens including an optical portion 41 having an optical function and support portions 42a and 42b extending from the optical portion 41, including: a protrusion 20 for bending a forward support portion 42a while abutting against the forward support portion 42a, the forward support portion being one of the support portions 42a and 42b and being disposed on the front side in an advancing direction of the intraocular lens, when making the intraocular lens 4 advance along an inner wall of a hollow body in which the intraocular lens 4 is set and thereby releasing the intraocular lens 4 from the hollow body in a state in which the intraocular lens 4 is folded with an inner surface of the optical portion 41 facing inward, wherein the protrusion 20 has a retainer that temporarily suppresses progress of bending of the forward support portion 42a by retaining the forward support portion 42a, when the intraocular lens 4 is being folded.