Heated Metal Filter for Exhaust Sterilization
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Solution Overview
Problem
Existing sterilization methods for gases and vapors in autoclave exhausts, such as those used in laboratories and biowaste destruction facilities, face challenges in ensuring complete sterilization, particularly during the early stages of the process when the sterilization temperature has not yet been reached, leading to a risk of hazardous agent escape.
Innovation Solution
A device that heats exhaust fluids to a temperature sufficient to kill microbial agents and conveys them through a heated metal filter unit, ensuring that microbial agents come into contact with surfaces at a temperature of at least 400°C, thereby achieving high sterility, with the filter unit seamlessly welded to the device body to allow temperatures above 600°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filters are arranged in the exhaust line to sterilize the exhaust stream, then the sterility of the exhaust is improved, but the risk of hazardous agents escaping during early process stages remains when sterilization temperature has not been reached
Solution Approach 1:
The filter is preheated to sterilization temperature (at least 400°C) before the exhaust stream passes through it, using a heating element integrated into the filter housing. This preliminary heating ensures the filter is already at sterilization temperature when exhaust gases enter, eliminating the risk of hazardous agents escaping during the warm-up phase of the autoclave cycle.
Solution Approach 2:
A heated metal filter serves as an intermediary between the autoclave exhaust stream and the environment. The filter is maintained at sterilization temperature through integrated heating elements, creating a thermal barrier that ensures all exhaust passing through is sterilized regardless of the autoclave's current temperature state.
2Reliability
If an open flame incinerator is used in the exhaust line to ensure sterilization, then the sterility is improved, but the operational complexity and cost increase, and other risks are introduced
Solution Approach 1:
The open flame incinerator is replaced with an electrically heated metal filter system. Instead of using combustion (chemical/thermal process), electric heating elements integrated into the filter housing provide the necessary heat (at least 400°C) for sterilization. This substitution eliminates the complexity of flame control, reduces operational risks, and simplifies the system while maintaining sterilization effectiveness.
3Ease of manufacture
If gaskets are used to join the filter to the device body, then the assembly is easier to manufacture, but the maximum operating temperature is limited to below 600°C
Solution Approach 1:
The gaskets are completely removed from the system. The filter is joined to the device body using direct welding of metal-to-metal surfaces, eliminating the organic material barrier that limited operating temperature. This extraction of the gasket component allows the system to operate at temperatures above 600°C without degradation of sealing components.
4Use of energy by moving object
If the filter is not heated to sterilization temperature, then energy consumption is reduced, but microbial agents can escape through the filter
Solution Approach 1:
The filter is preheated to sterilization temperature (at least 400°C) using integrated heating elements before exhaust gases pass through it. This preliminary heating action ensures the filter is already at the required temperature when needed, preventing microbial escape while minimizing energy consumption during the autoclave's warm-up phase.
Solution Approach 2:
The heating elements are activated periodically or on-demand based on the autoclave cycle stage. The filter heating is controlled to maintain sterilization temperature only when exhaust sterilization is required, reducing overall energy consumption while ensuring sterilization effectiveness when needed.
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 device achieves a very high degree of sterilization certainty by ensuring that microbial agents are denatured and trapped, with redundancy in the sterilization process, as demonstrated by effective removal of biologically active endotoxin in testing.
Implementation Method 1
exhaust fluid from equipment or a facility for treating biologically active material is heated to a temperature at least sufficient to kill or denature hazardous agents
Implementation Method 2
conveyed through a filter which is heated, preferably by the fluid, to essentially the same temperature
Implementation Method 3
a space provided with a heat source for heating a fluid flowing through the space which comprises a meandering channel for ensuring effective heat transfer
Data Source
AI summary
A device in which exhaust fluid from a facility or equipment for treating biologically active material is heated to a temperature of at least 400° C. to kill or denature hazardous agents, and conveyed through a metal filter with no more than 0.1 μm pore size, which is heated, preferably by the fluid, to essentially the same temperature. The relevant temperature is maintained during operation in both the fluid and the filter. Since the filter is dimensioned to trap microbial agents like bacteria and viruses and the temperature of the filter surfaces is sufficient for sterilization, microbial agents are bound to come into contact with said surfaces and a very high degree of sterilization certainty is reached. The filter is welded to the device body to provide a seamless structure. Heating and filtration are both alone sufficient for removing biohazardous agents, so the device provides double security.