Azeotrope-like Insect Repellent Mixtures in Passive Diffusion Devices
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Solution Overview
Problem
Current methods for minimizing exposure to biting arthropods, such as malaria and dengue vectors, are often ineffective due to unavailability, non-compliance, improper use, and ineffectiveness, highlighting the need for novel spatial repellents capable of long-term protection that require minimal human involvement.
Innovation Solution
Development of spatial repellent azeotrope-like mixtures comprising pyrethroids and solvents, integrated into controlled release passive devices (CRPDs) using absorbent materials, which repel, knock-down, and/or kill arthropod pests without requiring heat, movement, or electrical stimuli, providing extended protection up to 30 days.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If traditional insect control methods (residual insecticides, barrier sprays, ULV fogging) are used, then immediate insect control is achieved, but long-term protection and compliance are poor
Solution Approach 1:
The device uses passive diffusion through porous materials to release insect control composition without requiring external power sources, movement, or human intervention. The absorbent material self-regulates the release rate based on environmental conditions, achieving long-term protection without compliance issues
Solution Approach 2:
The insect control composition is pre-loaded into the porous absorbent material during manufacturing, allowing the device to begin immediate passive release upon deployment without requiring activation steps or user preparation
2Reliability
If active spatial repellent devices are used, then repellency is achieved, but energy consumption and device complexity increase
Solution Approach 1:
The patent replaces active mechanical or electrical repellent systems with a passive chemical diffusion system. The insect control composition naturally diffuses through the porous material and into the air, eliminating the need for fans, heaters, or electrical power sources while maintaining repellency efficacy
Solution Approach 2:
The device changes the physical state and release parameters of the insect control composition by using porous absorbent materials with specific pore sizes and structures. This controls the diffusion rate and vapor pressure, achieving effective repellency without requiring external energy input to maintain optimal concentration parameters
3Reliability
If permethrin is applied to fabric by impregnation or coating, then insect resistance is improved, but retention through successive washings is reduced
Solution Approach 1:
The patent uses porous absorbent materials that can trap and retain the insect control composition within their pore structures. The porous structure provides large surface area and capillary action to hold the composition, preventing it from being washed away while still allowing controlled diffusion into the air for sustained efficacy
Solution Approach 2:
The device combines the insect control composition (permethrin) with porous absorbent materials to create a composite structure. This composite allows the permethrin to be embedded within the porous matrix, providing both mechanical retention during washing and controlled release for sustained insect resistance
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 CRPDs demonstrate high knockdown rates and repellency, achieving almost 100% knockdown of mosquitoes within 24 hours and maintaining 80% repellency of free-flying mosquitoes, with the azeotrope-like mixtures effectively protecting areas up to 6.6 meters from the device, ensuring prolonged efficacy.
Implementation Method 1
controlled release passive devices (CRPDs) containing such mixtures to repel, knock-down, and/or kill arthropod pests
Implementation Method 2
the azeotrope-like mixture is present in the CRPD in an absorbent material
Data Source
AI summary
The disclosure relates to spatial repellent azeotrope-like mixtures, and the use of such azeotrope-like mixtures in controlled release passive devices (CRPD) to repel, knock-down, and/or kill arthropod pests.