Sterilization Challenge Device Filter Assembly Steam Penetration
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Solution Overview
Problem
Current sterilization challenge devices face difficulties in ensuring that the innermost regions of bundled items, such as towels, are adequately sterilized due to resistance in reaching these areas with steam, necessitating a cost-effective and accurate verification method.
Innovation Solution
A sterilization challenge device comprising a tubular body with a first chamber for indicators and a second chamber with filter members and gaskets, providing a restricted flow path that mimics the resistance encountered in the center of a towel bundle, allowing for verification of steam penetration and efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bundle of towels is sterilized using steam sterilization equipment, then the outer regions of the towels are effectively sterilized, but the innermost regions may not receive sufficient steam exposure to achieve proper sterilization levels
Solution Approach 1:
The patent introduces a challenge pack as an intermediary device that simulates the towel bundle structure. This challenge pack contains indicator sheets and absorbent material arranged to replicate the steam penetration resistance of actual towel bundles, allowing verification of sterilization process effectiveness without sterilizing the actual medical towels themselves
Solution Approach 2:
The challenge pack creates a simplified copy or model of the towel bundle structure. By replicating the key characteristic of steam penetration resistance using indicator sheets and absorbent material in a controlled configuration, the system can verify sterilization efficacy without dealing with the complexity of actual bundled towels
2Measurement precision
If challenge packs are designed to simulate the resistance to vacuum and steam penetration in towel bundles, then sterilization verification accuracy is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The challenge pack is segmented into distinct functional components: indicator sheets for visual verification, absorbent material for simulating towel characteristics, and a structured arrangement to replicate bundle geometry. This segmentation allows each component to be optimized independently while maintaining overall functionality
Solution Approach 2:
Different regions of the challenge pack have different properties - the indicator sheets provide visual feedback in specific locations, while absorbent material in different positions creates varying levels of steam penetration resistance. This local differentiation allows accurate simulation of the non-uniform steam distribution found in actual towel bundles
3Reliability
If existing challenge packs use multiple components such as paper stacks with indicator sheets or biological indicator vials, then sterilization verification capability is enhanced, but the cost and complexity of the device increase
Solution Approach 1:
The patent combines multiple verification functions into a single integrated challenge pack structure. The indicator sheets, absorbent material, and structural elements are merged into one unit that simultaneously provides visual verification, steam penetration simulation, and bundle structure replication, reducing the need for separate components like standalone biological indicator vials
Solution Approach 2:
The challenge pack is designed to perform multiple functions within a single device: it simulates vacuum resistance, steam penetration challenges, and provides visual verification through indicator sheets. This multi-functionality reduces the need for multiple separate devices and components, lowering overall manufacturing cost and complexity
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 effectively verifies the sterilization process by ensuring that steam reaches the innermost regions, providing a cost-effective and accurate method to mimic the conditions of the ANSI/AAMI ST79 challenge packs, with positive biological activity demonstrated in autoclave cycles.
Implementation Method 1
a filter assembly including at least one filter member. The only fluid communication between the at least one chamber and an external environment is provided through the filter assembly
Implementation Method 2
at least one gasket including an opening. In such embodiments, the at least one filter member and the at least one gasket may be arranged, such that each of the filter member is adjacent at least one gasket
Data Source
AI summary
A sterilization process challenge device configured to test the efficacy of a sterilization process includes a tubular body for containing at least one sterilization indicator and a filter assembly including at least one filter member. The only flow path into the interior of the tubular body containing at least one sterilization indicator is provided through the filter assembly to control and restrict flow of a gaseous sterilization medium from an external environment.