Water-Activated Iodine Release in Absorbent Materials
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Solution Overview
Problem
Current antimicrobial solutions for patient contact materials, such as wound dressings and sanitary products, face challenges in controlling bacterial and fungal growth, particularly in aqueous environments, where moisture can lead to microbial proliferation and infection, and existing methods often require direct application of antimicrobial agents or rely on silver ion release mechanisms that may not be cost-effective or flexible enough for widespread use.
Innovation Solution
An article comprising a water-absorbent material that reacts with water to produce molecular iodine, using an oxidation-reduction reaction between specific salts, such as cupric sulfate and potassium iodide, to create a localized concentration of iodine, which inhibits microbial growth without the need for external electric current, and can be integrated into various patient contact items like diapers and bandages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver ions are released through galvanic interaction with substrate, then antimicrobial activity is achieved, but cost increases and device complexity increases
Solution Approach 1:
The patent changes the chemical composition parameters by using zinc oxide and copper sulfate instead of silver compounds, fundamentally altering the material system to achieve antimicrobial activity through a different chemical mechanism that is more cost-effective and easier to manufacture
Solution Approach 2:
The patent employs inexpensive, readily available materials (zinc oxide, copper sulfate, sodium chloride) that can be easily manufactured and disposed of, replacing expensive silver-based systems with affordable alternatives suitable for single-use medical products
2Reliability
If antimicrobial agents are directly applied to patient contact surfaces, then microbial growth is controlled, but flexibility and comfort of the material are reduced
Solution Approach 1:
The patent concentrates antimicrobial agents (zinc oxide, copper sulfate, sodium chloride) specifically at the patient contact surface layer, while the bulk material maintains its flexibility and comfort properties, achieving localized antimicrobial action without compromising overall material performance
Solution Approach 2:
The patent creates a composite structure combining flexible base material with antimicrobial agent layers, integrating multiple functional components (flexibility, moisture absorption, antimicrobial activity) into a single product that delivers both comfort and protection
3Quantity of substance
If moisture is retained in contact with patient body, then absorbency function is achieved, but microbial proliferation is enabled
Solution Approach 1:
The patent converts the harmful effect of retained moisture (which promotes microbial growth) into a beneficial trigger by using the moisture itself to activate the antimicrobial reaction, where body fluids initiate the chemical reaction between zinc oxide, copper sulfate, and sodium chloride to produce antimicrobial zinc metal and sodium sulfate
Solution Approach 2:
The patent creates a self-activating system where the patient's own body moisture serves as the trigger to activate antimicrobial protection, eliminating the need for external activation mechanisms or additional components
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 provides a broad-spectrum antimicrobial effect, inhibiting bacterial and fungal growth by maintaining a concentration of at least 10 parts per million iodine in the water, thereby reducing the risk of infection and odor, while being safe, cost-effective, and maintaining flexibility for use in various applications.
Implementation Method 1
a composition that reacts with water to produce molecular iodine. The composition provides a local concentration of at least 10 parts per million iodine in water
Data Source
AI summary
An article is applied to the body of an animal (including humans) to provide both absorbency and antimicrobial activity. The article may comprise a water absorbent material; and a composition that reacts with water to produce molecular iodine. The composition provides a local concentration (in the water) of at least 10 parts per million iodine in water carried by the material (that is actual water supported by the water absorbent material) when the material has 5% by weight of water present in the water absorbent. The article may be a diaper, sanitary pad, bandage, bandaid or wrap for an animal.