Syringe Flat Indicia Surface for Readable Dosage Markings
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Solution Overview
Problem
Conventional medical syringes face challenges in applying volumetric dosage indicia on small barrels due to limited surface area and the need for rotation, leading to readability issues and increased risk of dosing errors.
Innovation Solution
A syringe design featuring a barrel with laterally offset needle retraction cavity and substantially flat, outwardly facing display surfaces, allowing for easy application of indicia using pad printing or embossing, and a needle safety device with a circumferentially extending tip shield for enhanced user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional syringes with cylindrical barrels are used, then the syringe structure is simple, but the surface area for applying dosage indicia is limited and requires rotation for printing
Solution Approach 1:
The patent transitions from a cylindrical barrel surface to a flat indicia display surface, changing the dimensional geometry from curved to planar. This flat surface provides adequate area for dosage indicia without requiring barrel rotation during printing, improving both printability and readability while maintaining simple syringe operation
2Length of moving object
If the needle retraction cavity is positioned coaxially with the needle, then the syringe structure is compact, but longer needles cannot be used without increasing syringe length
Solution Approach 1:
The patent repositions the needle retraction cavity from a coaxial position to a lateral position offset from the needle axis. This spatial reconfiguration allows the cavity to accommodate longer needles without increasing the overall syringe length, as the retraction cavity extends laterally rather than longitudinally
3Adaptability or versatility
If a needle retraction mechanism with lateral offset cavity is implemented, then longer needles can be used, but the device complexity increases
Solution Approach 1:
The syringe is divided into functionally independent components: the barrel with lateral offset retraction cavity, the needle assembly, and the plunger. This segmentation allows the retraction mechanism to operate independently through simple relative lateral movement between components, achieving versatility for various needle lengths and procedures without excessive complexity
Data Source
AI summary
A syringe for medical use having a barrel with a longitudinally extending tubular fluid chamber and at least one longitudinally extending, outwardly facing, substantially flat indicia display surface disposed proximally to the fluid chamber, a plunger slidably inserted into the fluid chamber, a needle projecting forwardly from the barrel in fluid communication with the fluid chamber; and a fixed length needle safety device having an activation handle slidably engaging the barrel and a forwardly projecting needle tip shield encircling the needle that moves forwardly to cover a tip end of the needle when the activation handle is moved forwardly following use of the syringe.