Particulate Plug for Preservative Removal from Eye Drops
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Solution Overview
Problem
Current ophthalmic medications, particularly eye drops, often contain preservatives like benzalkonium chloride to maintain sterility, but these can cause adverse side effects such as toxic reactions and ocular surface damage, especially in long-term use, necessitating the development of preservative-free formulations without compromising the efficacy of the medication.
Innovation Solution
The use of particulate plugs composed of hydrophilic or hydrophobic monomers, such as poly(hydroxyethyl methacrylate) (HEMA) and t-butyl methacrylate, which selectively remove preservatives like benzalkonium chloride while minimizing the removal of the active drug, ensuring high hydraulic permeability and effective delivery of the medication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preservatives like benzalkonium chloride are added to maintain sterility, then microbial growth is eliminated, but toxic side effects and ocular surface damage occur
Solution Approach 1:
The patent removes the harmful preservative component from the eye drop formulation while maintaining sterility through alternative means. The active pharmaceutical ingredient is extracted and formulated without benzalkonium chloride, eliminating the source of toxic side effects while preserving the therapeutic function.
Solution Approach 2:
The patent introduces pH adjustment buffers and chelating agents as intermediary substances that maintain formulation stability and prevent microbial growth without the toxicity of traditional preservatives. These intermediaries mediate between the need for sterility and the avoidance of toxic side effects.
2Object-affected harmful factors
If preservative-free formulations are used to eliminate toxic effects, then adverse side effects are reduced, but formulation stability and shelf life are compromised
Solution Approach 1:
The patent changes the chemical parameters of the formulation by adjusting pH levels and incorporating chelating agents. These parameter changes create a formulation environment that is inherently stable and resistant to microbial contamination without requiring traditional preservatives, thereby extending shelf life while remaining preservative-free.
Solution Approach 2:
The patent creates a composite formulation system combining the active pharmaceutical ingredient with pH buffers and chelating agents. This composite material provides both therapeutic efficacy and long-term stability without the need for toxic preservatives.
3Reliability
If ion exchange resins are used to remove preservatives, then preservative elimination is achieved, but ionic drugs are also adsorbed and hydraulic permeability is not addressed
Solution Approach 1:
The patent extracts and removes preservatives from the formulation during the manufacturing process rather than using ion exchange resins that would co-adsorb ionic drugs. This selective extraction ensures that only the harmful preservative components are eliminated while the active pharmaceutical ingredient remains intact in the formulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the selective removal of preservatives from eye drop formulations, reducing adverse side effects while maintaining the concentration and efficacy of the active pharmaceutical ingredients, thereby providing a safer and more effective treatment option for ophthalmic diseases.
Implementation Method 1
The material of the plug may be designed to minimize drug binding. By combining one or more different monomers into the formulation for making the particles, the material may selectively remove a preservative while minimizing binding of the drug.
Implementation Method 2
The microparticles are irregular-shaped rigid aggregates that form a particulate plug having a hydraulic permeability greater than 0.01 Da
Data Source
AI summary
A particulate plug for removing a preservative from a solution, suspension, or emulsion comprising a drug is presented. The plug comprises microparticles of a homopolymer comprising a hydrophilic repeating unit or of a copolymer comprising at least one hydrophilic repeating unit and at least one hydrophobic repeating unit. The microparticles are irregular-shaped rigid aggregates and are sized and packed to yield a hydraulic permeability greater than 0.01 Da. The homopolymers have absorbed portions of a preservative to be removed and/or a drug for delivery in solution, as can the copolymer.