Elastic Locking Body for Safety Syringe Sealing and Retraction
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Solution Overview
Problem
Existing safety syringes have complex structures, high production costs, and deficiencies in reusability, airtightness, and selective activation of safety mechanisms, leading to potential cross-infection and reuse issues.
Innovation Solution
A safety syringe with a simple structure using five components, allowing for standard needle exchange and multiple injections, with a user-selectable safety mechanism activation and needle retraction into the cylinder for shielding, utilizing an annular hollow barrel, plunger, and locking body with elastic properties for sealing and mechanical assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a retractable safety syringe uses a complex structure with multiple parts to achieve safety functions, then the safety protection capability is improved, but the device complexity and production cost increase
Solution Approach 1:
The locking body integrates multiple functions: it locks the needle connector to the barrel, seals the injection hole, and can be driven to retract the needle. This consolidation of functions into a single component reduces part count while maintaining safety capabilities
Solution Approach 2:
The locking body serves multiple purposes: mechanical locking, sealing, and needle retraction actuation. This multi-functionality eliminates the need for separate components for each safety function, simplifying the overall structure
2Reliability
If a safety syringe uses a non-elastic sealing component to ensure airtightness, then the sealing reliability is improved, but the ease of manufacture and assembly deteriorate
Solution Approach 1:
The locking body is made of elastic material that can be deformed during assembly and then returns to its original shape to create a reliable seal. This flexibility enables both easy assembly and dependable airtightness
3Object-affected harmful factors
If a safety syringe is designed for single use only to prevent cross-infection, then the cross-infection risk is reduced, but the loss of time and productivity increase due to disposal requirements
Solution Approach 1:
The syringe transitions from a locked, sealed state during injection to an unlocked, open state after use. The plunger can be pulled out after injection, and the needle connector can be removed and reused, enabling multiple injections while maintaining safety during each use
4Ease of operation
If a safety syringe automatically activates the safety mechanism when the plunger is pushed to the bottom, then the safety activation is simplified, but the adaptability and user control are reduced
Solution Approach 1:
The locking body is pre-positioned to seal the injection hole, but the needle connector remains removable. Users can choose to remove and reuse the needle connector after injection, providing selective activation of the safety mechanism based on specific needs
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 solution provides a cost-effective, reliable, and user-friendly safety syringe that meets international standards for selective activation and needle shielding, reducing the risk of cross-infection and reuse, while enabling multiple injections without leakage.
Implementation Method 1
the locking body is made of a polymer material with elasticity
Implementation Method 2
the sealing ring and the inner sealing ring of the needle connector are matched to constitute a sealing structure B
Data Source
AI summary
The safety syringe includes a barrel having a clamping slot, a large sealing ring and a zero line; a plunger having a pull pawl and an annular convex clamping disc, an avoiding seams; a rubber plug; a needle connector having annular clamping pawls, an inner sealing ring and a pullback ring; and a locking body made of a polymer material with elasticity and having a sealing disc, a sealing ring, a clamping ring and a checking ring. The sealing disc, large sealing ring, sealing ring and inner sealing ring are engaged to constitute a sealing structure. When the clamping ring meshed with the pull pawl is dragged to retract inwards, the sealing ring and pullback ring are engaged to pull the needle connector to retract, and the checking ring is plugged into the inner cavity of the clamping pawls to fix the clamping pawls in the clamping slot.