Avermectin Topical Formulation for Resistant Head Lice Elimination
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Solution Overview
Problem
Current treatments for head lice infestations, including over-the-counter and prescription products, are ineffective against treatment-resistant strains and pose health risks to humans, highlighting the need for a safe and effective solution.
Innovation Solution
A topical formulation containing avermectin or ivermectin, combined with solubilizers, suspending agents, preservatives, non-ionic surfactants, humectants, and water, which is applied to the scalp to effectively kill both susceptible and treatment-resistant head lice strains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional insecticide treatments (pyrethrins, permethrin, lindane, malathion) are used to eliminate head lice, then lice killing effectiveness is improved, but treatment-resistant strains develop and human health risks increase
Solution Approach 1:
The patent changes the chemical parameter of the active ingredient from traditional insecticides (pyrethrins, permethrin, lindane, malathion) to avermectin, a different class of compound with a novel mechanism of action. This parameter change allows effective lice elimination while avoiding the resistance and toxicity issues associated with traditional insecticides
Solution Approach 2:
The patent uses avermectin as an intermediary substance that bridges the gap between effective lice control and safety. Avermectin acts through a different neurological mechanism (glutamate-gated chloride channels) compared to traditional insecticides, providing an intermediate solution that maintains efficacy while reducing harmful effects on humans and preventing resistance
2Reliability
If higher concentrations of insecticides are used to overcome treatment-resistant lice strains, then elimination effectiveness is improved, but toxicity to the human host increases
Solution Approach 1:
The patent changes the chemical identity parameter to avermectin, which has a different safety profile and mechanism of action. This allows effective treatment of resistant strains at safe concentrations because avermectin targets invertebrate-specific glutamate-gated chloride channels that are not present in mammals, providing selective toxicity that spares human hosts
3Adaptability or versatility
If multiple insecticide classes are tested and combined to address resistance, then treatment versatility is improved, but formulation complexity and potential interactions increase
Solution Approach 1:
The patent extracts the essential function of lice elimination from the complex mixture of multiple insecticide classes and isolates it into a single active ingredient: avermectin. This extraction simplifies the formulation while maintaining versatility against both susceptible and resistant strains through avermectin's unique mechanism of action
Solution Approach 2:
Avermectin serves as a universal active ingredient that functions against multiple lice strains (both susceptible and treatment-resistant) as well as other parasitic infestations. This single substance provides multi-functionality that would otherwise require multiple different insecticide formulations
Data Source
AI summary
An avermectin-based topical formulation is disclosed which is useful for prevention and treatment of head lice (Pediculus humanus capitis). This topical formulation may be formulated as a shampoo-condition which comprises an effective amount of avermectin, solubilizers, suspending agents, preservatives, nonionic surfactants, humectants, a silicone compound, and water. Also disclosed are methods of using the topical formulations disclosed within this specification to treat either a susceptible or treatment-resistant strain of lice, as well as uses in the manufacture of a medicament for treating or preventing a lice infestation from a susceptible or treatment-resistant strain in a human patient.