Three-Wipe Chemical Decontamination Set for Anticancer Agent Removal
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Solution Overview
Problem
Existing wipe sets are insufficient in removing anticancer agents from surfaces due to unclear correlations between chemical degradation capability and physical removal efficacy, leading to incomplete decontamination, especially for agents like cyclophosphamide which require longer degradation times.
Innovation Solution
A novel wipe set comprising three wipes: one impregnated with sodium hypochlorite, one with sodium thiosulfate, and one with sodium hydroxide, each with specific concentration ranges, and a method involving different wiping orders to maximize chemical degradation and physical removal capabilities, ensuring effective removal of anticancer agents from contaminated surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional two-wipe kit (hypochlorite + thiosulfate) is used, then the wiping process is simple and quick, but the removal efficacy of anticancer agents is insufficient
Solution Approach 1:
The wiping process is segmented into three distinct stages using three separate wipes: (1) sodium hypochlorite wipe for chemical degradation and oxidation, (2) sodium thiosulfate wipe for neutralization and reduction, and (3) sodium hydroxide wipe for saponification and physical removal. This segmentation allows each wipe to perform its specific function optimally, achieving both high removal efficacy and operational efficiency
Solution Approach 2:
The invention optimizes the concentration parameters of each chemical agent impregnated in the wipes: sodium hypochlorite (5-20% w/w), sodium thiosulfate (10-30% w/w), and sodium hydroxide (5-20% w/w). These parameter optimizations ensure rapid chemical reactions and effective anticancer agent removal within a short wiping time, resolving the contradiction between speed and efficacy
2Reliability
If the chemical degradation time is extended to ensure complete inactivation of slow-degrading agents, then the removal efficacy improves, but the total wiping time increases
Solution Approach 1:
The sodium hypochlorite wipe performs preliminary chemical degradation and oxidation of the anticancer agent before physical removal. This preliminary action weakens and breaks down the chemical structure of the agent, making subsequent physical removal by the sodium hydroxide wipe much more effective and faster, thus achieving complete inactivation without extending total wiping time
Solution Approach 2:
The three-wipe system establishes a continuous chain of chemical actions: oxidation by hypochlorite, neutralization by thiosulfate, and saponification by hydroxide. This continuous useful action ensures that the anticancer agent is progressively degraded and removed without interruption, maintaining high inactivation completeness while minimizing total processing time
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 novel wipe set achieves removal of anticancer agents over an area approximately double that of conventional methods, effectively reducing health risks to operators by ensuring thorough decontamination and safe disposal.
Implementation Method 1
The chemical degradation capability is a chemical reaction between a medical agent impregnated into a wipe and an anticancer agent, and is an effect of denaturing and inactivating the anticancer agent
Implementation Method 2
a second wipe impregnated with a solution containing 30 to 110 mg of a sodium thiosulfate aqueous solution per gram of the wipe
Implementation Method 3
a third wipe impregnated with a solution containing 4 to 110 mg of a sodium hydroxide aqueous solution per gram of the wipe
Implementation Method 4
causing the wipe to adsorb and absorb the agent for disposal
Data Source
AI summary
A novel wipe set and a novel wiping method in which the wipe set is used are provided. With the wipe set comprising a first wipe impregnated with 50 to 200 mg of a sodium hypochlorite aqueous solution per gram of the wipe, a second wipe impregnated with 30 to 110 mg of a sodium thiosulfate aqueous solution per gram of the wipe, and a third wipe impregnated with 4 to 110 mg of a sodium hydroxide aqueous solution per gram of the wipe as well as by the wiping method in which the wipe set of the present invention is used, an anticancer agent spilled on a working table, for example, can be removed effectively.