Bleach-Cleanable EVA Clamshell Bag for EMTs
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Solution Overview
Problem
Emergency medical bags currently used by EMTs absorb blood and other body fluids, potentially spreading pathogens, and their water-repellent properties are compromised by surface dirt, with existing cleaning methods either ineffective or damaging to the materials.
Innovation Solution
A bleach-cleanable bag design featuring a clamshell structure with an impermeable, flexible ethylene-vinyl acetate copolymer (EVA) material, liquid-resistant seal, and removable components for easy disinfection, including an elastic oxygen cylinder harness and detachable straps for enhanced hygiene and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional woven fabrics with DWR treatment are used, then the bag is durable and affordable, but the fabric absorbs blood and body fluids, potentially spreading pathogens
Solution Approach 1:
The patent uses a composite material structure consisting of an inner impermeable layer (polyethylene or polypropylene) and an outer woven fabric layer. This composite structure provides both durability from the woven fabric and pathogen resistance from the impermeable layer, resolving the contradiction between durability and pathogen absorption.
Solution Approach 2:
The patent employs a flexible impermeable film or coating layer applied to the interior surface of the bag. This thin film barrier prevents blood and body fluids from penetrating the fabric while maintaining the bag's flexibility and durability, effectively blocking pathogen absorption.
2Reliability
If DWR treatment is applied to fabrics, then water resistance is improved, but surface dirt penetrates fibers and compromises water-repellent properties
Solution Approach 1:
The patent creates a composite structure where an impermeable membrane or coating is bonded to the woven fabric. This composite provides stable water resistance that does not degrade when exposed to dirt, as the impermeable layer maintains its water-repellent properties regardless of surface contamination.
Solution Approach 2:
The patent applies water-repellent properties locally through an impermeable barrier layer specifically at the interior surface where fluid contact occurs. This localized treatment ensures water resistance where needed while the exterior fabric can be cleaned without compromising the water-repellent function.
3Object-affected harmful factors
If bleach or chemicals are used to clean the bag, then microbiology is killed, but the bag materials are ruined
Solution Approach 1:
The patent uses an impermeable membrane or coating material that is specifically selected for its chemical resistance. This material can withstand exposure to bleach and disinfectants without degrading, allowing thorough cleaning and sterilization while maintaining material strength and integrity.
Solution Approach 2:
The patent describes an removable liner or inner bag that can be easily discarded after use. This disposable component can be contaminated and then replaced, eliminating the need to clean the main bag structure and avoiding chemical damage to durable materials.
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 a fully cleanable and durable medical bag that effectively prevents the spread of pathogens, maintains water resistance, and allows for easy cleaning with bleach or hospital-grade wipes, ensuring the bag remains functional and hygienic between uses.
Implementation Method 1
an elasticized harness so that a cylinder can be added and removed without adjustment
Implementation Method 2
the lid lip engages with the base lip to form a seal that is resistant to liquid passing through
Data Source
AI summary
A completely bleach-cleanable, clamshell bag composed of molded emulsified EVA. A base and lid form a generally rectangular compartment that removably holds a variety of caddies via PALS strips. A lid lip engages with a base lip to form a liquid-resistant seal. The hinges are flexible, coated webbing straps for durability and to facilitate cleaning. The latch includes side release buckles on flexible, coated webbing straps. Handles are composed of flexible, coated webbing straps. A recess in the base floor holds an oxygen cylinder with an attached regulator, retained by an elastic cylinder harness designed for cylinders of different lengths. The bag includes a waist belt, a pair of shoulder straps, and a carry strap, all of which are removable to facilitate cleaning. An optional flashlight arm can rotate and pivot removably attaches a flashlight.