Syringe Piston Surface Structure Friction Reduction
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Solution Overview
Problem
Existing syringe components face challenges in reducing friction between the cylinder and piston or seal without causing pharmaceutically undesirable interactions, as materials like silicone and PTFE can react with certain active ingredients and compromise sealing tightness.
Innovation Solution
A surface structure with specific geometric features, such as linear indentations, elevations, and patterns on the syringe components, is introduced to reduce friction without adding additional materials, ensuring effective sealing and minimizing interactions with active ingredients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If an additional layer with friction-reducing properties (such as silicone layer or PTFE layer) is provided between the piston and cylinder, then friction is reduced, but pharmaceutically undesirable interactions occur between the layer material and the active ingredient
Solution Approach 1:
The invention extracts the harmful additional material layer from the system and replaces it with a geometric surface structure on the piston rod. The surface structure consists of longitudinal grooves and/or transverse grooves that reduce friction through geometry alone, eliminating the risk of pharmaceutical interactions while maintaining the friction-reducing function.
Solution Approach 2:
The surface structure acts as an intermediary between the piston rod and the cylinder wall. Instead of using a material layer as an intermediary, the invention uses a geometric surface structure with grooves that create a lubricating effect through the geometry itself, reducing friction without introducing any material that could interact with the active ingredient.
2Force
If PTFE layer is used to reduce friction, then friction is reduced, but the seal is compromised because PTFE is relatively hard
Solution Approach 1:
The invention replaces the material-based friction reduction system (PTFE layer) with a geometry-based system (surface structure with grooves). The grooves create a mechanical lubricating effect through their shape and arrangement, reducing friction without relying on material properties that compromise sealing.
Solution Approach 2:
The surface structure applies local quality variations through grooves at specific locations on the piston rod surface. The grooves are strategically positioned and dimensioned to provide friction reduction exactly where needed, while the rest of the piston rod surface maintains its sealing contact with the cylinder wall.
3Object-affected harmful factors
If a surface structure with grooves is formed on the piston rod, then friction is reduced without additional materials, but the manufacturing complexity increases
Solution Approach 1:
The invention merges the friction-reducing function with the existing piston rod manufacturing process. The surface structure with grooves is integrated into the piston rod as a single component, combining the structural function of the piston rod with the friction-reducing function in one manufacturing step, rather than adding a separate material layer.
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 surface structure effectively reduces friction between syringe components, preventing jerky movements and ensuring precise dosing while avoiding pharmaceutically undesirable effects, thus enhancing the administration and sampling processes.
Implementation Method 1
a surface structure formed by shaping a region (4) of the component (1, 2, 3), wherein the surface structure (5) is designed to reduce friction within the syringe due to its shape
Data Source
Figure 1A~1B
Figure 2~4
Figure 5~8
AI summary
A component (1, 2, 3) for a syringe (101, 102) is disclosed, which has a structure (5) formed that, due to its shape, reduces friction in the syringe (101, 102). The component can, in particular, be a cylinder (1), a piston (2), or a seal (3) for the syringe (101, 102). The structure (5) consists, for example, of elevations or depressions having a linear, point-like, elliptical, or polygonal plan. A syringe (101, 102) having at least one such component (1, 2, 3) is also disclosed. The use of a component (1, 2, 3) with a friction-reducing structure (5) eliminates the need for an additional friction-reducing coating made of, for example, silicone, which can lead to undesirable effects on the drug administered with the syringe.