Syringe-Barrel Grip With Gas-Flow Gap and Flange Rotation Restriction
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Solution Overview
Problem
Existing syringe designs face challenges in achieving high sterility, particularly when surface sterilization methods like hydrogen peroxide or NO2 sterilization are used, as the sterilization gas does not effectively contact a wide enough area of the prefilled syringe, including the grip, due to design limitations that restrict rotation and hinder gas flow.
Innovation Solution
A syringe barrel grip with a flange housing portion that includes a flange insertion and rotation restricting mechanism, allowing a gap for sterilization gas to flow around the barrel, while restricting relative rotation and ensuring good operability through inclined grip straight portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the grip is firmly attached to the barrel to prevent rattling and detachment, then the attachment reliability is improved, but the sterilization gas cannot flow between the grip and barrel, reducing sterilization effectiveness
Solution Approach 1:
The inner peripheral surface of the grip is segmented into two distinct regions: a lower region that is separated from the barrel to form a gap for sterilization gas flow, and an upper region that contacts the barrel to prevent detachment. This segmentation allows the grip to simultaneously achieve both sterilization accessibility and secure attachment.
Solution Approach 2:
Different regions of the grip's inner peripheral surface have different functional qualities: the lower region has a non-contact quality to allow gas flow and sterilization, while the upper region has a contact quality to prevent detachment. This local differentiation of functional qualities resolves the contradiction between sterilization effectiveness and attachment reliability.
2Ease of operation
If the flange is restricted from rotating relative to the grip to improve operational stability, then the operability is improved, but the attachment structure becomes more complex
Solution Approach 1:
The flange and grip feature asymmetric inclined surfaces (inclined grip straight portions) that engage with each other. This asymmetric inclination allows the flange to be inserted and rotated easily during attachment, while the inclined surfaces naturally restrict further rotation to a predetermined angle, providing operational stability without complex mechanisms.
Solution Approach 2:
The attachment structure transitions from a static restricted design to a dynamic one where the flange can rotate freely during insertion, then automatically locks at a predetermined angle through the engagement of inclined surfaces. This dynamic behavior simplifies the attachment process while ensuring operational stability.
3Object-affected harmful factors
If the sterilization gas is allowed to flow between the grip and barrel, then the sterilization effectiveness is improved, but the grip may become detached or rattle during operation
Solution Approach 1:
The inner peripheral surface of the grip is segmented into a lower non-contact region that allows sterilization gas flow and an upper contact region that prevents detachment. This segmentation enables both sterilization effectiveness and attachment reliability to coexist.
Solution Approach 2:
Instead of completely separating the grip from the barrel (which would ensure sterilization but cause detachment), the design applies partial separation only in the lower region necessary for sterilization gas flow, while maintaining contact in the upper region to prevent detachment. This partial action achieves the necessary sterilization without compromising attachment reliability.
Data Source
Figure 1
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Figure 5
AI summary
A syringe barrel grip 30 of the present invention is attached to a syringe barrel 20 including a flange 22 in which a pair of flange straight portions 24 and 24 is formed. A flange housing portion 32 of the grip 30 includes a flange rotation restricting portion 35 that restricts relative rotation between the grip 30 and the flange 22 that has entered the flange rotation restricting portion 35 by rotating the barrel 20 by a predetermined angle in a state where the flange 22 is housed in a flange insertion portion 34, and there is a gap 40 for allowing a sterilization gas to flow between a lower inner peripheral surface of the grip 30 and the barrel 20 in a state where the flange 22 is housed in the flange rotation restricting portion 35.