Eyelid Separator Device with Adjustable Orifices for Intravitreal Injection
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Solution Overview
Problem
Current devices for intravitreal injections are unsafe due to lack of effective eyelid fixation, limited compatibility with different syringe types, and require multiple geometries for varying patient needs, making large-scale production complex and costly.
Innovation Solution
A one-piece device with a hook-shaped shoulder for pulling the upper eyelid, featuring multiple orifices with adjustable distances for needle insertion, allowing safe and versatile intravitreal injection with reduced parts and enhanced robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a one-piece device is used, then robustness and ease of manufacture are improved, but adaptability to different patient needs deteriorates
Solution Approach 1:
The device incorporates adjustable orifices that can be positioned at different distances from the corneoscleral junction (3.5mm for cataract patients, 4mm for other patients), allowing a single device design to adapt to different patient requirements without compromising manufacturing simplicity
Solution Approach 2:
The one-piece device structure serves multiple functions: it provides eyelid separation through the hook-shaped shoulder, guides needle insertion through the orifices, and can accommodate different needle types, while maintaining robustness and ease of manufacture
2Adaptability or versatility
If multiple geometries are manufactured for different patients, then adaptability to patient needs is improved, but device complexity and production cost increase
Solution Approach 1:
The device allows dynamic adjustment of the orifice position during manufacturing or assembly to match different patient requirements (3.5mm or 4mm from corneoscleral junction), eliminating the need to manufacture multiple fixed-geometry devices
Solution Approach 2:
The orifice distance parameter can be varied to accommodate different patient needs (3.5mm for cataract patients, 4mm for others), allowing a single device design to serve multiple patient populations without increasing overall device complexity
3Ease of manufacture
If holes with constant distances are used, then ease of manufacture is improved, but adaptability to different patient requirements deteriorates
Solution Approach 1:
The orifice positioning system allows dynamic adjustment to provide 3.5mm distance for cataract patients and 4mm distance for other patients, maintaining ease of manufacture while achieving adaptability
Solution Approach 2:
The distance parameter of the orifice from the corneoscleral junction can be changed based on patient requirements, enabling a single manufactured design to serve different clinical scenarios
4Reliability
If pulling means are added to separate the eyelid, then reliability of the injection process is improved, but device complexity increases
Solution Approach 1:
The hook-shaped shoulder for pulling the eyelid is integrated into the same one-piece device structure as the orifices and support elements, combining multiple functions without adding separate components or mechanisms
Solution Approach 2:
The single device structure simultaneously provides eyelid separation through the hook-shaped shoulder, needle guidance through the orifices, and support for the injection procedure, achieving reliability without proportionally increasing complexity
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a device (1) for separating a patient's eyelid in procedures for the intravitreal injection of medicinal substances, comprising an ergonomic distal sector (9) for contacting the corneoscleral limbus of the patient's eye, at least one orifice (3) for introducing a needle (11) of a syringe, having a hook-shaped shoulder (2) for contacting the patient's upper eyelid, the device further comprising a handle (4) geometrically adapted for being secured with the fingers and pulling on the patient's upper eyelid by means of the hook-shaped shoulder with the patient in a supine decubitus position.