Intraocular Lens Injection Instrument Guide Mechanism
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Solution Overview
Problem
Existing intraocular lens injection instruments face issues with properly positioning the lens on the axis, leading to potential bending, inclination, and unintended gaps, which can cause scratches or damage during the injection process.
Innovation Solution
An intraocular lens injection instrument featuring a storage member with a restriction and release mechanism that rotates to align the lens correctly onto the axis, using a contact portion to guide the lens without applying excessive stress, ensuring proper alignment and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the push member is pushed slowly to move the IOL onto the axis from the outside of the axis, then the IOL can be moved without damage, but an unintended gap is apt to be created between the IOL and the inner wall of the injector
Solution Approach 1:
A guide member is introduced as an intermediary component between the push member and the IOL. The guide member has a guide surface that contacts the IOL and guides it onto the axis, preventing gap formation while the push member moves the IOL. This mediator ensures both slow movement (preventing damage) and continuous contact (preventing gaps).
Solution Approach 2:
The solution transitions from one-dimensional linear pushing to two-dimensional guided movement. The guide member provides a surface that constrains the IOL's movement path, ensuring it follows the correct trajectory onto the axis while maintaining contact, thus solving the gap problem without requiring faster pushing.
2Productivity
If the push member is pushed forcibly to move the IOL onto the axis quickly, then productivity is improved, but the IOL could be damaged when deformed
Solution Approach 1:
The guide member acts as a mediator that distributes the pushing force evenly across the IOL's surface. This allows faster pushing speeds while preventing localized stress concentration that would cause deformation or damage to the delicate IOL structure.
Solution Approach 2:
The guide member provides dynamic guidance during the IOL's movement onto the axis. As the push member moves the IOL, the guide surface continuously adjusts to maintain proper contact and alignment, enabling faster operation without compromising the IOL's structural integrity.
3Ease of operation
If the IOL is placed outside the axis in the storage state, then ease of operation is improved for lens retrieval, but the IOL may become bent or inclined when pushed onto the axis
Solution Approach 1:
The guide member is pre-positioned in the injector before the IOL is pushed onto the axis. This preliminary arrangement ensures that as soon as the IOL begins its movement from the storage position, it is immediately guided by the guide surface, preventing bending or inclination from occurring during the transition.
Solution Approach 2:
The guide member serves as an intermediary structure that bridges the storage position (outside axis) and the injection position (on axis). It provides a controlled transition path that maintains the IOL's shape stability while allowing easy retrieval from the storage state.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
An intraocular lens injection instrument (1) for injecting an intraocular lens (IOL) (2) into a patient's eye, including: an injection part (10) formed with an inner wall for folding the soft IOL (2) and a front end (11) for injecting the IOL folded along the inner wall into an eye; a cylinder body part (30) provided with the injection part (10) at its end portion; a push member (40) for pushing the IOL toward the front end of the injection part, the push member being movable back and forth along an axis (L) extending from the front end of the injection part to a rear end of the intraocular lens injection instrument (1); a restriction member (110) attached to the cylinder body part (30) to restrict movement of the IOL (2) which is placed outside the axis; and a release member (120) for releasing restriction of the movement of the IOL (2) restricted by the restriction member (110) and pushing the IOL onto the axis, wherein the release member (120) includes a contact portion (123a-c) to be brought into contact with the IOL (2) when the restriction by the restriction member (110) is released, the contact portion having a setting surface (123e) to be brought into contact with the IOL (2) placed on the axis (L).