Contact Lens Disinfection With pH-Enhanced Peroxide Neutralization
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Solution Overview
Problem
Existing disinfection systems using hydrogen peroxide for contact lenses are cumbersome and require large amounts of metal catalysts for effective neutralization, leading to increased costs and potential eye irritation due to residual hydrogen peroxide.
Innovation Solution
A disinfection system that includes a hydrogen peroxide solution with organic carboxylic acids like glycolic, tartaric, or citric acid, adjusted to a pH of 6 to 8, and a metal catalyst, enhancing neutralization efficiency and allowing direct lens wear after treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of catalyst metal is increased to improve neutralization efficiency, then the neutralization rate of hydrogen peroxide is improved, but the cost increases
Solution Approach 1:
The invention changes the pH parameter of the disinfecting solution from the conventional acidic range to a neutral range of 6 to 8. This parameter change dramatically improves the neutralization efficiency of the metal catalyst, allowing effective neutralization with significantly reduced amounts of catalyst metal, thereby resolving the contradiction between neutralization efficiency and catalyst quantity.
2Reliability
If hydrogen peroxide is used at high concentration to achieve desired disinfection effect, then the disinfection effectiveness is improved, but the amount of residual hydrogen peroxide that needs to be removed increases
Solution Approach 1:
By changing the pH parameter to a neutral range of 6 to 8, the invention enhances the neutralization capability of the metal catalyst. This allows for more complete removal of residual hydrogen peroxide from high-concentration disinfection treatments, effectively resolving the contradiction between achieving strong disinfection and minimizing harmful residues.
3Reliability
If conventional neutralization treatment methods are used, then hydrogen peroxide can be removed, but the disinfection operation becomes cumbersome and complicated
Solution Approach 1:
The invention merges the neutralization function with the existing disinfecting solution by adjusting its pH to 6-8 and adding a metal catalyst. This integration eliminates the need for separate neutralization steps, making the entire disinfection operation simpler and more straightforward while ensuring complete hydrogen peroxide removal.
4Quantity of substance
If the amount of catalyst metal is reduced to lower cost, then cost reduction is achieved, but the neutralization efficiency decreases
Solution Approach 1:
The pH parameter change to a neutral range of 6 to 8 fundamentally alters the chemical environment to favor catalyst activity. This parameter optimization allows minimal amounts of precious metal catalyst to achieve high neutralization efficiency, completely reversing the traditional trade-off between catalyst quantity and neutralization performance.
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 system improves hydrogen peroxide neutralization efficiency, reduces catalyst metal usage, and ensures safe direct lens wear by minimizing residual hydrogen peroxide, thus lowering costs and reducing eye irritation.
Implementation Method 1
a metal catalyst, enhancing neutralization efficiency
Implementation Method 2
The pH of the disinfecting solution is adjusted to 6 to 8, so that the contact lens is effectively disinfected and the neutralization rate of the hydrogen peroxide is effectively improved
Data Source
AI summary
A disinfection system of a contact lens comprising immersing the contact lens in a disinfecting solution containing hydrogen peroxide in a concentration of 1 to 10% and neutralizing the hydrogen peroxide in the disinfecting solution through contact with a metal catalyst, where the disinfecting solution contains an organic carboxylic acid or a salt of the organic carboxylic acid, the organic carboxylic acid having a structure in which a hydroxyl group and a carboxyl group are bonded to one carbon atom; the disinfecting solution is adjusted to have a pH of 6 to 8; and the disinfecting solution after the neutralization is adjusted to have an osmotic pressure of 250 to 350 mOsm.