Contact Lens Care Solution Wetting Agent Composition
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Solution Overview
Problem
Contact lens care solutions often cause discomfort and irritation due to the absorption of components by the lenses, leading to dry eyes and potential infections from protein and lipid deposits, despite efforts to enhance wetting abilities.
Innovation Solution
A contact lens care solution comprising a wetting agent with a specific ratio of vinylacetamide-containing polymer, alginic acid, and glycerol, which is biocompatible and low-cytotoxic, improving wetting ability and reducing discomfort by minimizing glycerol absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If glycerol is added to the care solution to enhance wetting ability, then the wetting ability is improved, but the discomfort and irritation caused by glycerol absorption increases
Solution Approach 1:
The patent changes the chemical composition parameters by introducing vinylacetamide-containing polymer and alginic acid as additional wetting agents alongside glycerol. This multi-component approach modifies the wetting mechanism to achieve effective wetting while reducing the harmful effects of glycerol absorption, as the polymer and alginic acid provide alternative wetting pathways that are less irritating to the eye.
Solution Approach 2:
The patent creates a composite wetting agent system combining glycerol, vinylacetamide-containing polymer, and alginic acid. This composite approach leverages the complementary properties of each component: glycerol provides basic wetting, the vinylacetamide polymer provides biocompatibility and low cytotoxicity, and alginic acid enhances the wetting effect without causing irritation. The synergistic combination resolves the contradiction by achieving superior wetting with reduced harm.
2Productivity
If contact lenses are immersed in care solution to remove protein and lipid deposits, then the cleaning ability is improved, but the absorption of care solution components causes eye discomfort
Solution Approach 1:
The vinylacetamide-containing polymer and alginic acid act as intermediary substances that facilitate the cleaning process while protecting the eye from direct contact with harmful components. These intermediaries bind to protein and lipid deposits, enabling their removal through the care solution while the polymer and alginic acid components themselves remain biocompatible and non-irritating, thus mediating between effective cleaning and eye protection.
3Object-affected harmful factors
If demulcents and wetting agents are added to relief wearers' discomfort, then the ocular comfort is improved, but the complexity of the care solution formulation increases
Solution Approach 1:
The vinylacetamide-containing polymer and alginic acid serve multiple functions simultaneously: they act as wetting agents to improve tear film distribution, as demulcents to relieve eye dryness, and as biocompatible substances to reduce irritation. This multi-functionality allows the patent to address multiple comfort issues with a unified additive package, reducing the need for separate specialized agents and thereby limiting the increase in formulation complexity.
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
The solution effectively relieves ocular discomfort and irritation while maintaining effective protein and lipid removal, ensuring improved eye health and comfort during contact lens wear.
Implementation Method 1
the wetting agent used in the present contact lens care solution comprises a specific ratio of vinylacetamide-containing polymer, alginic acid and glycerol... provides good biocompatibility, low cytotoxicity and the ability to be aptly adsorbed to the contact lenses
Implementation Method 2
it is know that the glycerol used in the contact lens solution absorbed on the contact lens may absorb the moisture of the eye
Data Source
AI summary
The invention is related to a contact lens care solution comprising a buffer solution, a chelating agent, a surfactant and a wetting agent, wherein the wetting agent comprises 100 parts by weight of glycerol, 0.5 to 40 parts by weight of vinylacetamide-containing polymer and 5 to 40 parts by weight of alginic acid.