Intraocular Lens Insertion Device Slider Mechanism
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Solution Overview
Problem
Existing intraocular lens insertion devices often cause the rear supporting portion to be stretched or left outside the eye during insertion, particularly with soft intraocular lenses having thin strips as supporting portions, leading to additional reoperation and increased surgical complexity.
Innovation Solution
An intraocular lens insertion device with a slider featuring a first abutting portion with a slanted surface and second abutting portions that guide and bend the rear supporting portion toward the optical part, ensuring proper alignment and reducing the need for reoperation by stabilizing the supporting portion during lens insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a dedicated intraocular lens insertion device with a plunger is used to push out the lens, then the lens can be inserted through a small incision, but the rear supporting portion may slip between the plunger and passage inner wall or become tangled with the plunger
Solution Approach 1:
The insertion device is divided into distinct functional sections: a passage for lens insertion, a plunger for pushing the lens, and a dedicated receiving portion for the rear supporting structure. This segmentation allows each component to perform its specific function without interference, preventing the rear supporting portion from slipping or tangling.
Solution Approach 2:
A receiving portion is introduced as an intermediary structure between the plunger and the rear supporting portion. This receiving portion has an inner diameter that fits the rear supporting portion, acting as a guide and protector that prevents the supporting portion from slipping between the plunger and passage wall or becoming tangled during the insertion process.
2Shape
If the rear supporting portion is pushed up by the plunger to bend it upward, then the haptic can be positioned higher than the IOL, but the supporting portion may be stretched during the process
Solution Approach 1:
The receiving portion serves as a protective intermediary that cradles the rear supporting portion during the bending process. By providing a fitted inner diameter, it guides the supporting portion through the bending motion without allowing it to stretch or deform excessively, maintaining its structural integrity while achieving the desired haptic position.
Solution Approach 2:
The receiving portion is designed with specific dimensional parameters (inner diameter matching the rear supporting portion) that change the mechanical constraints during insertion. This parameter optimization allows the supporting portion to bend to the required angle without exceeding its elastic limits, preventing permanent deformation or damage.
3Length of moving object
If thin filamentary members or thin strips are used as supporting portions to reduce device size, then soft intraocular lenses can be inserted through smaller incisions, but the rear supporting portion is more prone to slipping and tangling
Solution Approach 1:
The receiving portion acts as a specialized intermediary structure designed to accommodate thin filamentary members or thin strips. Its inner diameter is precisely matched to these delicate supporting portions, providing guidance and protection that prevents them from slipping or tangling, thereby enabling the use of smaller incisions without compromising control over the delicate components.
Solution Approach 2:
The receiving portion is designed to work with flexible thin filamentary members and thin strips as supporting portions. The structure accommodates the flexibility of these thin components while providing sufficient constraint through its inner diameter, allowing them to be manipulated through small incisions without losing control or causing complications.
Data Source
Figure 1~2
Figure 3
Figure 4~6(B)
AI summary
There is provided an intraocular lens insertion device capable of appropriately regulating the motion of a rear supporting portion during a process of moving an intraocular lens, and reducing the possibility of reoperation being required after the intraocular lens is inserted into an eye. An intraocular lens insertion device 1 comprises a main body 2, and a slider 3 and a plunger 4 that are attached to the main body 2. Further, the intraocular lens insertion device 1 is of a preset type in which an intraocular lens 5 is placed inside the main body 2 in advance. The slider 3 includes a first abutting portion 21 for pushing up a supporting portion 7 (rear supporting portion 7a) arranged on a rear side of an optical part 6 with respect to a lens advancement axis A, and second abutting portions 22a, 22b abutting against an outer edge of a rear portion of the optical part 6.