Preservative-Free Ophthalmic Drops With Controlled Drop Volume
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Solution Overview
Problem
Existing ophthalmic formulations face challenges in providing stable, preservative-free solutions with efficient dosing and reduced drop volume variability, while ensuring patient compliance and minimizing systemic side effects.
Innovation Solution
Aqueous pharmaceutical formulations with controlled surface tension, viscosity, and pH, packaged in containers with integral bacterial protection systems, including mechanical tip-seal technology and silver ions, to ensure stability and accurate drop size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preservatives are added to multi-dose ophthalmic containers, then microbial contamination is prevented, but preservative-related side effects and patient compliance issues occur
Solution Approach 1:
The invention extracts and removes preservatives from the ophthalmic composition entirely, relying instead on the sterile barrier properties of the dropper tip and controlled dispensing system to prevent microbial contamination without exposing the eye to harmful preservative chemicals
Solution Approach 2:
The dropper tip acts as an intermediary barrier that prevents microbial contamination of the preservative-free formulation. The tip's design creates a physical barrier that maintains sterility without requiring chemical preservatives in the medication itself
2Ease of operation
If conventional dropper tips are used, then dispensing is simple, but drop size variability is high leading to imprecise dosing
Solution Approach 1:
The invention changes the geometric parameters of the dropper tip, specifically the orifice diameter (0.45-0.65mm) and tip dimensions, to control and standardize drop size. This geometric control ensures consistent drop volumes (25-35µl) while maintaining ease of dispensing operation
Solution Approach 2:
The invention replaces reliance on user technique and variable manual dispensing with a mechanically controlled tip design that inherently produces consistent drop sizes through its specific orifice geometry and structure
3Object-affected harmful factors
If preservative-free formulations are used, then patient compliance and safety improve, but chemical and physical stability becomes problematic
Solution Approach 1:
The invention applies local quality control by optimizing specific formulation parameters (pH 5.0-7.0, viscosity 0.5-2.0 cP, surface tension 25-35 mN/m) and using localized stabilizing excipients to maintain stability of the preservative-free formulation without requiring broad-spectrum preservatives
4Adaptability or versatility
If drop size is not controlled, then dispensing is flexible, but dosing accuracy and treatment effectiveness decrease
Solution Approach 1:
The invention establishes specific parameter ranges for the dropper tip (orifice diameter 0.45-0.65mm, tip outer diameter 2.0-3.0mm) and formulation properties (viscosity 0.5-2.0 cP, surface tension 25-35 mN/m) that together ensure consistent drop sizes while preserving dispensing flexibility
Data Source
AI summary
The present invention relates to a preservative-free, aqueous solution in the form of eye drops packed in a container that ensures stability of the product, ideal eye drop volume and reduced drop volume variability and provides efficient dispensing.