Plastic Lining for Heated Surgical Trays with Fluoropolymer Bottom
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Solution Overview
Problem
Conventional plastic linings for heated metal surgical trays suffer from damage due to contact with the heated bottom and mechanical loads, with non-uniform thermal energy transfer and inadequate heat protection, as well as visibility issues due to layered construction and high thermal conductivity.
Innovation Solution
A plastic lining with a polyamide-polyethylene composite side wall and a fluoropolymer-based, transparent or translucent bottom area, designed as flexible films for shape adaptation, with a single-layer construction to prevent cavities and ensure uniform heat transfer, and a thickness gradient for mechanical stability and compact storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layer construction with aluminum blank is used for heat protection, then the plastic lining is protected against temperature peaks, but thermal energy transfer becomes non-uniform due to insulating cavities or folds between layers
Solution Approach 1:
The invention extracts the aluminum blank from the structure and replaces it with a transparent plastic layer having heat-resistant properties. This eliminates the problematic multi-layer construction with cavities while maintaining heat protection functionality and enabling uniform thermal energy transfer through the single-layer transparent bottom.
2Reliability
If an aluminum blank is used as heat protection layer, then temperature peaks are protected, but the user cannot check the condition of the shell or liner contact due to non-transparency
Solution Approach 1:
The invention uses a transparent or translucent plastic material for the bottom layer instead of opaque aluminum. This allows visual inspection of the shell condition and liner contact while the plastic material provides the necessary heat-resistant properties, thus maintaining both protection and visibility functions.
3Reliability
If aluminum blank with high thermal conductivity is used, then heat protection is provided, but temperature peaks are passed on well to the inner plastic layer
Solution Approach 1:
The invention changes the thermal conductivity parameter by replacing aluminum (high thermal conductivity) with a plastic material having appropriate heat-resistant properties. This modification allows the material to withstand temperature peaks without conducting them efficiently to the inner layer, while still providing adequate heat protection.
4Loss of energy
If the plastic lining is made as a single layer, then uniform heat transfer is achieved and visibility is enabled, but mechanical stability and resistance to surgical instruments are reduced
Solution Approach 1:
The invention applies different material properties to different areas: the bottom layer uses a transparent, heat-resistant plastic for uniform heat transfer and visibility, while the side wall and apron areas use more robust materials (polyamide-polyethylene composite and polyethylene respectively) to provide the necessary mechanical stability and resistance to surgical instruments.
5Strength
If the side wall area and base area are made thicker for mechanical stability, then resistance to surgical instruments is improved, but the lining becomes less compact for storage
Solution Approach 1:
The invention implements a thickness gradient where the base area and side wall areas have greater thickness (200-300 μm and 120-180 μm respectively) to provide mechanical stability, while the apron area has reduced thickness (40-80 μm) to minimize overall volume. This localized thickness optimization achieves both mechanical strength and compact storage requirements.
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 solution provides enhanced mechanical stability, uniform heat transfer, and visibility for inspection, while maintaining lightness and compactness, effectively addressing the issues of damage and heat protection in conventional linings.
Implementation Method 1
the floor area contains at least one temperature-resistant fluoropolymer, in particular tetrafluoroethylene-hexafluoropropylene copolymer (FEP) or polytetrafluoroethylene (PTFE)
Implementation Method 2
the side wall area and the bottom area are designed as flexible, transparent films... ensures uniform heat transfer
Implementation Method 3
the side wall area contains at least polyamide and polyethylene, and is designed in particular as a film made of a polyamide-polyethylene composite
Data Source
Figure 1a~1b
AI summary
The invention relates to a plastic lining for a heated bowl (4), comprising a bowl area (1) adaptable to the shape of the bowl (4) and a skirt area (2) adjoining the bowl area (1) for covering a substructure of the bowl (4), wherein the skirt area (2) comprises polyethylene, and the bowl area (1) comprises a side wall area (11) for covering the side wall of the bowl (4) and a bottom area (3) for covering the bottom of the bowl (4), wherein the side wall area (11) comprises at least polyamide and polyethylene, and the bottom area (3) comprises at least one fluoropolymer, in particular tetrafluoroethylene-hexafluoropropylene copolymer (FEP) or polytetrafluoroethylene (PTFE). The invention further relates to a method for producing this plastic lining.