Syringe Tip Cap with Fluoropolymer Insert for Leak-Proof Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing syringe tip caps fail to provide a secure, leak-proof seal due to material incompatibility and dimensional irregularities, leading to potential contamination and leakage issues.
Innovation Solution
A syringe tip cap design featuring a rubber body with an elastic insert and a fluoropolymer-coated surface, ensuring a tight fit and seal resistant to the syringe contents, utilizing natural or synthetic rubber and fluoropolymer film combinations for enhanced adhesion and friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rubber body is used to provide elasticity and resilience for tight fitting, then the cap can compensate for dimensional irregularities, but the rubber material may release components that pollute the syringe contents
Solution Approach 1:
The cap is divided into two functional parts: an inner insert made of medical-grade fluoropolymer that contacts the syringe contents, and an outer body made of elastic rubber that provides fitting capability. This segmentation allows each material to perform its optimal function without the drawbacks of the other.
Solution Approach 2:
The fluoropolymer insert acts as an intermediary barrier between the rubber body and the syringe contents. It provides a chemically inert surface that prevents rubber components from contaminating the medication while still allowing the rubber body to provide elastic fitting.
2Object-affected harmful factors
If a fluoropolymer film is applied to the inner surface to prevent contamination, then material compatibility is improved, but the stiffer film may not fit completely to irregular tip surfaces, reducing adhesion and causing leaks
Solution Approach 1:
The sealing function is segmented between two materials: the fluoropolymer insert provides chemical inertness and prevents contamination, while the surrounding rubber body provides elasticity and conformability to irregular surfaces. This division of functional responsibilities resolves the contradiction between chemical safety and sealing reliability.
Solution Approach 2:
The cap uses a composite structure combining fluoropolymer and rubber materials, each contributing their superior properties. The fluoropolymer provides contamination resistance while the rubber provides adaptive sealing, creating a composite solution that overcomes the limitations of either material alone.
3Object-affected harmful factors
If the fluoropolymer film is made stiffer to resist syringe contents, then chemical resistance is improved, but the film loses flexibility and cannot accommodate dimensional irregularities of the tip
Solution Approach 1:
The cap structure segments the chemical resistance function from the conformability function. The fluoropolymer insert, which can be stiffer and more chemically resistant, is surrounded by the flexible rubber body that conforms to irregular surfaces. This segmentation allows both properties to coexist without compromise.
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 secure, leak-proof seal that withstands thermal sterilization and accommodates dimensional irregularities, ensuring the integrity of the syringe contents while maintaining material compatibility.
Implementation Method 1
an insert consisting of elastic material fitted into the bore
Implementation Method 2
utilizing natural or synthetic rubber and fluoropolymer film combinations for enhanced adhesion and friction
Data Source
Figure 1
Figure 2
AI summary
A syringe tip cap has to adhere firmly to the syringe tip to ensure tight sealing and must not deteriorate the content of the syringe. A tip cap from elastic material having a blind bore to accommodate the tip is provided with an insert, which is introduced into the bore and is at least on the exposed end face coated with a fluoropolymer film.