Steam Sterilizer Cassette with Insulating Shell
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Solution Overview
Problem
Existing steam sterilizers for medical instruments and devices pose a challenge as they become extremely hot and difficult to handle after the sterilization process due to exposure to saturated steam, making them unsafe for immediate post-processing handling.
Innovation Solution
A compact steam sterilizer design featuring a metallic container with an insulating shell and elongated rails, which allows for safe handling post-sterilization by minimizing heat transfer through the use of thin metal sheets and an insulating material, along with a receiver unit that provides structural support to maintain the integrity of the sterilization chamber during steam exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the metallic container is exposed to saturated steam at high temperature for sterilization, then the sterilization effectiveness is improved, but the container becomes extremely hot and difficult to handle after sterilization
Solution Approach 1:
An insulating shell made of heat-resistant material is introduced as an intermediary between the metallic container and the external environment. This shell acts as a thermal barrier that protects the container from excessive heat during sterilization while allowing the sterilization process to proceed effectively, thereby resolving the contradiction between sterilization effectiveness and handling safety
Solution Approach 2:
The sterilizer employs a composite structure combining a metallic container (for structural integrity and steam penetration) with an insulating shell (for heat protection). This composite material approach allows the system to simultaneously achieve effective sterilization through the metal while protecting against heat through the insulating material, thus resolving the temperature-related handling issue
2Ease of operation
If the container walls are made thin to reduce heat transfer, then the handling safety is improved, but the structural strength and ability to withstand steam pressure may be compromised
Solution Approach 1:
The system uses a composite structure where thin-walled metal containers are combined with an external insulating shell. The thin metal walls allow for reduced heat transfer and improved handling safety, while the insulating shell provides the necessary structural support and heat resistance that would otherwise require thick metal walls, thus resolving the contradiction between thin walls for safety and strength requirements
Solution Approach 2:
The sterilizer is divided into separate functional components: a thin-walled metallic container for holding instruments and an external insulating shell for structural support and heat protection. This segmentation allows each component to be optimized independently - the metal container can be thin for heat reduction while the shell provides the necessary strength, resolving the contradiction between wall thickness and structural integrity
3Reliability
If the sterilization chamber is pressurized with steam to improve sterilization effectiveness, then the sterilization temperature and penetration are improved, but the risk of component separation increases
Solution Approach 1:
The insulating shell serves as a rigid external structure that reinforces the overall assembly during pressurized steam sterilization. This composite construction allows the chamber to be pressurized for effective sterilization while the shell prevents component separation, resolving the contradiction between pressurization for sterilization effectiveness and structural stability
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 sterilizer effectively sterilizes medical instruments using saturated steam while ensuring the cassette can be safely handled shortly after the process, minimizing heat transfer and preventing separation of the sterilization chamber components, thus enhancing user safety and operational efficiency.
Implementation Method 1
An insulating shell encases the metallic container and the plurality of rails wherein an outer surface of the insulating shell lies in the first plane
Data Source
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AI summary
A sterilizer having a cassette for holding metal instruments or medical devices. The cassette includes a metallic container that defines a sterilization chamber. The container has at least one outer surface. A plurality of spaced-apart, elongated rails extend along the at least one outer surface of the container. Each of the rails includes a free, longitudinal edge wherein the edges of the rails lie in a first plane. An insulating shell encases the metallic container and the plurality of rails. An outer surface of the insulating shell lies in the first plane. A receiving unit includes a housing having an outer surface and an inner surface. The inner surface engages the edges of the rails and the outer surface of the insulating shell when the cassette is disposed within the inner housing. A plurality of spaced-apart elongated ribs extends along the outer surface of the housing.