Intraocular Lens Insertion Tube Tip Curvature
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Solution Overview
Problem
Existing intraocular lens insertion apparatuses face issues with the circumferential edge of the leading end opening end surface breaking when the insertion tube decreases in size, leading to increased restorative forces that can cause the edge to fracture during lens extrusion.
Innovation Solution
The apparatus features a leading end opening end surface with an inclined surface and a curved circumferential edge near the base end, where the curvature radius is set to be equal to or smaller than in other regions, and the tapered outer peripheral surface is formed with a curvature radius smaller than in other areas, to thicken the edge and prevent breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the insertion tube decreases in size to reduce patient burden, then the incision size and patient burden are reduced, but the thickness of the leading end decreases and the restorative force increases causing the circumferential edge to break
Solution Approach 1:
The patent applies local quality by creating a curved shape with a specific curvature radius in the predetermined region of the circumferential edge near the base end, while maintaining different curvature radii in other regions. This localized geometric modification thickens the edge at the critical location without increasing the overall insertion tube size, thereby resolving the contradiction between miniaturization and edge strength.
2Reliability
If the leading end opening end surface is formed with an inclined surface and curved circumferential edge, then the circumferential edge breaking is suppressed, but the manufacturing complexity increases
Solution Approach 1:
The patent employs spheroidality by forming the circumferential edge with a curved shape having a specific curvature radius that is equal to or smaller than the curvature radius of other regions. This curved geometry naturally distributes stress and prevents edge breaking while being manufacturable using standard molding or machining techniques, thus achieving reliability without excessive manufacturing complexity.
Data Source
AI summary
Provided is technology which can prevent the circumferential section of the end surface of a tip end opening from being damaged when an intraocular lens is extruded from an insertion apparatus, even when an insertion tube of the intraocular lens insertion apparatus has been further reduced in size. Provided is an intraocular lens insertion apparatus in which the end surface of a tip end opening (10j) in a tip end section (10a) of an insertion tube is an inclined surface that is inclined with respect to a surface (M) perpendicular to a central axis (L) of the insertion tube, and also the angle of inclination, with respect to the surface (M) perpendicular to the central axis (L) of the insertion tube, of the end surface of the tip end opening is larger toward a base end section (101) than toward a tip end section (100), wherein a predetermined region of the circumferential section toward the base end section (101) of the end surface of the tip end opening (10j) has a curved shape that protrudes toward the outside, and has a radius of curvature (R4) that is equal to or less than the radius of curvature of another region of the circumferential section.