Syringe Barrel Lateral Projection for Scale Readability
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Solution Overview
Problem
Conventional insulin syringe designs face challenges in visibility and usability due to the small surface area and narrow width of the barrel, leading to distorted and obscured graduated scale markings, particularly for diabetic patients with vision impairments, despite adherence to ISO standards.
Innovation Solution
A modified syringe barrel with a lateral projection adjacent to the side wall for presenting the graduated scale, allowing a flat and incisive alignment with the plunger's fiducial line, enhancing visibility and compliance with ISO specifications, while enabling adaptations for expanded standards and other medical device registrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the graduated scale is presented on the barrel surface, then the scale is visible, but the limited surface area and narrow width cause distorted and obscured markings
Solution Approach 1:
The graduated scale is moved from the cylindrical barrel surface to a flat projection extending laterally. This dimensional change allows the scale to be presented on a planar surface with sufficient area, eliminating the distortion caused by the barrel's curved geometry while maintaining visibility and measurement accuracy.
2Loss of information
If the scale markings are made larger for better visibility, then readability improves, but the barrel surface area becomes insufficient to accommodate them
Solution Approach 1:
By transferring the scale to a lateral projection, the design creates additional surface area in a different spatial dimension. This allows larger, more readable markings without increasing the barrel's cylindrical dimensions, effectively resolving the conflict between marking size and available surface area.
3Length of moving object
If the barrel width is reduced for miniaturization, then the syringe becomes more compact, but the scale markings become distorted and harder to view
Solution Approach 1:
The scale presentation is shifted from the barrel's cylindrical surface to a separate lateral projection. This allows the barrel to maintain its miniaturized narrow width while the scale markings are displayed on an extended planar surface, eliminating distortion caused by the narrow curvature.
4Measurement precision
If the plunger stopper is positioned to align with scale markings, then dosing accuracy is achieved, but the plunger continually obscures the scale markings
Solution Approach 1:
The graduated scale is extracted from the barrel surface and relocated to a lateral projection. This separation removes the obstruction problem, as the plunger stopper no longer blocks the scale markings when positioned for accurate dosing, while measurement precision is maintained through the projection's alignment with the plunger.
5Area of stationary object
If the scale column is made dense to fit the barrel, then the scale fits within the barrel, but viewing of the barrel contents is impeded
Solution Approach 1:
The graduated scale is extracted from the barrel surface and presented on a lateral projection. This removes the visual obstruction caused by the dense scale column, allowing unimpeded viewing of the barrel contents while the scale remains accessible for accurate measurement through the projection's extended surface.
Data Source
AI summary
A medical syringe with a modified barrel employs a graduated scale presentation for improved readability. The syringe's barrel has an outward and longitudinally aligned projection with a surface contiguous to the barrel's surface. The graduated scale is presented in whole or in part on the projection's surface, and is parallel to and immediately adjacent to the barrel's surface for edge-to-edge alignments with the fiducial line of the barrel's plunger. The graduated scale and its elements are compliant with ISO standards. Alternative scale presentations are readily adaptable for ISO consideration and expanded standards.