Diverging Eyewash Streams Prevent Contaminant Intrusion
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Solution Overview
Problem
Existing emergency eyewash stations often direct water streams inwardly, which can carry contaminants into a person's tear ducts and sinus cavities, potentially causing tissue damage and allowing ingested contaminants to spread further.
Innovation Solution
The design features an eyewash unit with diverging water streams that flush contaminants in an inside-out direction, away from tear ducts and sinus cavities, and includes optional facewash perforations and a combined emergency shower system with a pressure-compensating shower head for thorough rinsing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If upwardly directed converging water streams are used to flush contaminants from eyes, then flushing effectiveness is improved, but contaminants are carried into tear ducts and sinus cavities causing tissue damage
Solution Approach 1:
The patent inverts the conventional converging stream design by using diverging streams that flow away from the face center. Instead of directing water inward toward the nose and mouth area, the streams are directed outward and upward, reversing the flow direction to prevent contaminant intrusion into sensitive anatomical structures while maintaining flushing effectiveness
2Productivity
If inward-directed flush flows are used, then contaminants are washed toward the center of the face, but contaminants are ingested and swallowed spreading further
Solution Approach 1:
The patent applies inversion by directing water streams outward away from the face center rather than inward. This reverse direction prevents contaminants from being channeled toward the mouth and throat area, eliminating the ingestion pathway while preserving the washing action on the eyes and face
3Ease of manufacture
If conventional spray heads are mounted over sink, then easy installation is achieved, but water streams do not provide adequate inside-out flushing direction
Solution Approach 1:
The spray head is segmented into multiple independent nozzles arranged to create diverging streams. This segmentation allows each nozzle to be oriented at specific angles to achieve the desired outward and upward flow pattern, providing both the correct flushing direction and ease of installation as a modular unit
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
This configuration effectively prevents contaminants from contacting sensitive anatomical structures, reducing tissue damage and ensuring thorough rinsing of contaminants from the eyes and body, while maintaining compliance with safety standards.
Implementation Method 1
the pair of water discharge ports are configured to provide a pair of eyewash flush flow water streams that are angularly diverging
Implementation Method 2
designed to provide a regulated outflow of shower water which is substantially constant over a range of normal water inflow pressures
Data Source
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AI summary
An emergency eyewash unit includes a pair of water discharge ports oriented to produce a pair of upwardly directed, diverging water streams for inside-out flush flow of contaminants from a person's eyes. These eyewash streams can be combined with a plurality of smaller upwardly directed facewash streams for flushing contaminants from a person's face. The eyewash and/or facewash streams are produced by an eyewash body adapted for rotatable mounting onto a water supply conduit, with a locking clip normally preventing undesired rotational disassembly. The eyewash body may be used in combination with an overhead emergency shower which, in one preferred form, includes a shower spray head carrying multiple flow control and flow shaper elements to produce a substantially uniformly dispersed shower spray pattern.