Syringe Barrel Grip Assembly for Sterilization Gas Flow
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Solution Overview
Problem
Existing syringes require higher sterility, especially in ophthalmic use, and existing grips do not allow for effective sterilization of the entire prefilled syringe, including the grip, without compromising operability.
Innovation Solution
A syringe barrel grip design with a flange housing portion, flange insertion portion, and flange rotation restricting portion that allows for attachment to the syringe barrel while maintaining a gap for sterilization gas flow and preventing relative rotation, ensuring comprehensive sterilization without compromising grip functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grip is firmly attached to the syringe barrel to prevent rattling and detachment, then the reliability of the assembly is improved, but the sterilization gas cannot flow between the grip and barrel, reducing sterilization effectiveness
Solution Approach 1:
The grip's flange housing portion is divided into distinct functional regions: a flange insertion portion with a first pair of grip straight portions, and a flange rotation restricting portion with a second pair of grip straight portions. This segmentation allows different sections to serve different purposes - secure attachment in one region and sterilization gas flow in another.
Solution Approach 2:
Different portions of the grip have different structural characteristics optimized for their specific functions. The flange insertion portion has parallel grip straight portions for secure engagement, while the flange rotation restricting portion has inclined grip straight portions that create spacing between the grip and barrel, allowing sterilization gas flow in those specific local areas.
2Object-affected harmful factors
If the grip structure is designed to allow sterilization gas flow, then sterilization effectiveness is improved, but the grip may become loose or detach during operation
Solution Approach 1:
The attachment structure is segmented into multiple engagement points: the first pair of grip straight portions in the flange insertion portion and the second pair of grip straight portions in the flange rotation restricting portion. This multi-point segmentation maintains overall attachment reliability even when certain areas are spaced for gas flow.
Solution Approach 2:
The second pair of grip straight portions are inclined relative to the first pair, creating an asymmetric structure that provides both attachment security and controlled spacing. The inclined portions engage with the flange at angles that prevent detachment while allowing gas flow paths.
3Reliability
If the grip is designed with multiple components for secure attachment, then the attachment reliability is improved, but the device complexity increases, making sterilization more difficult
Solution Approach 1:
Multiple attachment functions are merged into a single integrated flange housing portion. The flange insertion portion and flange rotation restricting portion are combined in one component that attaches to the barrel in a single operation, achieving secure attachment without requiring multiple separate parts.
Solution Approach 2:
The flange housing portion serves multiple functions simultaneously: it houses the flange, restricts rotation, provides secure attachment through grip straight portions, and allows sterilization gas flow through controlled spacing. This multi-functionality reduces the need for additional separate components.
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 design achieves higher sterility of the syringe by allowing wider surface contact with sterilization gas while maintaining operability and preventing unintentional detachment of the grip.
Implementation Method 1
a gap for allowing a sterilization gas to flow between the lower inner peripheral surface of the grip and the barrel
Data Source
AI summary
A syringe barrel grip is attached to a syringe barrel including a flange in which a pair of flange straight portions is formed. A flange housing portion of the grip includes a flange rotation restricting portion that restricts relative rotation between the grip and the flange that has entered the flange rotation restricting portion by rotating the barrel by a predetermined angle in a state where the flange is housed in a flange insertion portion, and there is a gap for allowing a sterilization gas to flow between a lower inner peripheral surface of the grip and the barrel in a state where the flange is housed in the flange rotation restricting portion.