Multi-Component Syringe Stopper with Sealing Ribs
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Solution Overview
Problem
Medical syringe stoppers face challenges in achieving a high sealing effect while maintaining low sliding and friction properties, which are crucial for gentle movement and efficient medication delivery, especially with high-quality or potentially harmful active ingredients.
Innovation Solution
A multi-component stopper design featuring a central stopper body made of hard plastic surrounded by a softer plastic sealing jacket with cylindrical ribs, allowing for deformability and reduced friction through suitable deformation zones, enabling stable thread formation for axial displacement and low contact pressure on the syringe body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stopper with a sealing jacket made of softer material is used to improve sealing effect, then the sealing effect is improved, but the sliding friction and adhesive properties worsen
Solution Approach 1:
The stopper is designed with different material properties in different regions: the central stopper body is made of harder plastic for structural stability and thread formation, while the sealing jacket is made of softer plastic for sealing. The sealing jacket further features circumferential sealing ribs with deformation zones that have optimized local softness and deformability. This local differentiation of material properties allows the stopper to simultaneously achieve high sealing effect and low sliding friction.
Solution Approach 2:
The stopper employs a composite structure combining two different plastic materials with distinct properties. The central stopper body uses harder plastic for mechanical strength and thread engagement, while the sealing jacket uses softer plastic for sealing contact. This composite material approach enables the stopper to reconcile the conflicting requirements of sealing effectiveness and low friction movement.
2Reliability
If the sealing jacket is made softer to improve sealing, then sealing effect improves, but breakaway forces increase
Solution Approach 1:
The sealing jacket is designed with circumferential sealing ribs that incorporate deformation zones, allowing the structure to dynamically adapt during movement. The softer material in the deformation zones enables controlled elastic deformation that reduces static friction and breakaway forces, while maintaining sealing contact. This dynamic deformability allows the seal to conform to the syringe body wall during both stationary and moving states.
Solution Approach 2:
The patent optimizes the material parameters of the sealing jacket, specifically selecting softer plastic with appropriate deformability characteristics. The width of the sealing ribs is carefully controlled to balance sealing pressure and friction. These parameter optimizations enable the sealing jacket to achieve effective sealing while minimizing the forces required to initiate and maintain movement.
3Stability of the object's composition
If a hard central stopper body is used to form stable threads, then thread stability improves, but sealing contact pressure increases
Solution Approach 1:
The stopper is segmented into two functional components: a central stopper body for thread formation and actuation force transmission, and a separate sealing jacket for sealing contact. This segmentation allows the harder central body to provide stable thread engagement while the softer sealing jacket provides low-pressure sealing contact, eliminating the need for the entire stopper to be hard.
Solution Approach 2:
Different regions of the stopper are assigned different material hardness properties: the central stopper body is harder for structural stability and thread engagement, while the sealing jacket is softer for low-pressure sealing. This local quality differentiation resolves the contradiction between thread stability and contact pressure by assigning each function to the most suitable material region.
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
This design enhances sealing efficacy, reduces frictional resistance, and allows for gentle and efficient movement of the stopper within the syringe body, supporting applications like aspiration and medication reconstitution with reduced breakaway forces.
Implementation Method 1
the provision of a multi-component plug (110) with an inner, comparatively harder component (112) allows for a stable thread to be formed therein... the sealing jacket (114) has a substantially cylindrical outer jacket (130) which is provided with a plurality of circumferential sealing ribs (132)... suitable deformation zones can be provided by a suitable outer profile
Data Source
Figure 1~2
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Figure 7~11
AI summary
A multi-component stopper (110) for a medical syringe (1) comprises, for improved properties with regard to sealing and adhesion and frictional forces in the syringe body (2, 2', 2") according to the invention, a central stopper body (112) made of a first, comparatively hard plastic, and a sealing jacket (114) made of a second, softer plastic compared to the first plastic, which at least partially encloses the central stopper body (112), wherein the sealing jacket (114) has a substantially cylindrical outer shell (130) which is provided with a plurality of circumferential sealing ribs (132) spaced apart from each other when viewed in the direction of the cylinder axis.