Intraocular Lens Insertion Tip Asymmetry and Curvature

Solution Overview

Problem

Existing intraocular lens insertion apparatuses face difficulties in securely inserting and retaining the lens within smaller discission wounds, leading to potential ejection of the lens outside the eye during the insertion process.

Innovation Solution

The intraocular lens insertion apparatus features a cylindrical body with a fore-end opening having an oblique surface and parallel lateral walls, a tapering shape, and a positioning member to ensure stable retention and guidance of the lens into the human crystalline capsule, preventing ejection and facilitating insertion into smaller wounds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the discission wound is made smaller to reduce patient burden, then the surgical trauma is reduced, but the insertion apparatus cannot be securely inserted into the wound

Engineering Contradiction:

Improvesurgical traumaVSAvoidsecure insertion

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The tip of the insertion apparatus is designed with a curved surface that smoothly contacts the wound tissue. This curved geometry allows the apparatus to be inserted into smaller discission wounds without causing unnecessary tissue stimulation or damage, while still achieving secure insertion. The curvature enables the tip to conform to the wound geometry and distribute contact forces evenly.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The opening at the tip of the insertion apparatus has an asymmetric structure with a roof portion that is oblique to the longitudinal direction of the opening. This asymmetric design allows the apparatus to be inserted into smaller wounds while preventing the intraocular lens from dislodging during insertion and ejection operations. The oblique roof provides directional guidance and retention.

Inventive Principle:

Principle #4Asymmetry

2Length of moving object

If the opening is made to fit smaller wounds, then insertion into small wounds becomes possible, but the intraocular lens may go out from the opening outside the discission wound

Engineering Contradiction:

Improveopening sizeVSAvoidlens retention

Core Design Contradiction:

Length of moving objectVSReliability

Solution Approach 1:

The opening at the tip of the insertion apparatus has an asymmetric structure with a roof portion that is oblique to the longitudinal direction of the opening. This asymmetric design allows the apparatus to be inserted into smaller wounds while preventing the intraocular lens from dislodging during insertion and ejection operations. The oblique roof provides directional guidance and retention.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The tip of the insertion apparatus has different structural features at different locations: a curved surface at the very tip for smooth tissue contact, and an oblique roof portion at the opening for lens retention. This local differentiation of structural qualities allows the apparatus to simultaneously achieve secure insertion into small wounds and reliable lens retention during ejection.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If the opening has a curved shape to reduce tissue stimulation, then smooth contact with wound is achieved, but difficulty in inserting into predetermined position occurs

Engineering Contradiction:

Improvetissue stimulationVSAvoidinsertion positioning

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The tip of the insertion apparatus is designed with a curved surface that smoothly contacts the wound tissue. This curved geometry allows the apparatus to be inserted into smaller discission wounds without causing unnecessary tissue stimulation or damage, while still achieving secure insertion. The curvature enables the tip to conform to the wound geometry and distribute contact forces evenly.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The opening at the tip of the insertion apparatus has an asymmetric structure with a roof portion that is oblique to the longitudinal direction of the opening. This asymmetric design allows the apparatus to be inserted into smaller wounds while preventing the intraocular lens from dislodging during insertion and ejection operations. The oblique roof provides directional guidance and retention.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS10213295B2Intraocular lens insertion apparatus

Publication Date: 2019.02.26 KOWA CO LTD

AI summary

Intraocular lens insertion apparatus includes a cylindrical body member configured to retain an intraocular lens, a fore-end opening provided for a tip of the body member, and a planate protrusion provided for a tip of the fore-end opening. Further, an end surface of the fore-end opening is an oblique surface which is oblique to a plane perpendicular to a central axis of the body member, and a fore-end area including a pair of lateral walls which are parallel to each other across the central axis is formed on a side of the tip of the fore-end opening.