Syringe Closure Cap With Deformable Sealing Plug
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Solution Overview
Problem
The handling of toxic and harmful medications in prefilled syringes poses health risks due to potential leaks during preparation and administration, necessitating a closure system that ensures high tightness and ease of use while being cost-effective.
Innovation Solution
A two-component closure cap system featuring a rigid carrier cap with an external thread and a softer, deformable sealing plug made of rubber or TPE, designed for snap-in assembly and enhanced by gripping elements for user-friendly handling, ensuring a high sealing effect and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closure system for prefilled syringes is designed to ensure high tightness and prevent medication leakage, then the sealing performance is improved, but the device complexity and handling difficulty increase
Solution Approach 1:
The closure cap is divided into two separate components: a rigid carrier cap (made of plastic or metal) and a soft sealing plug (made of elastomer). These components are assembled together to form a complete closure system, allowing each component to fulfill its specific function while maintaining overall simplicity
Solution Approach 2:
The closure system combines two different materials with complementary properties: a rigid material (plastic or metal) for the carrier cap to provide mechanical strength and stability, and a soft elastomeric material for the sealing plug to provide leakage prevention. This composite approach achieves high sealing performance without excessive complexity
2Reliability
If a two-component closure cap system is used to achieve high sealing effect, then the tightness is improved, but the ease of manufacture and assembly is reduced
Solution Approach 1:
The carrier cap is pre-assembled with the sealing plug before the final closure operation. The sealing plug is inserted into the carrier cap in advance, creating a pre-assembled unit that simplifies the final closure step and ensures proper alignment during assembly
Solution Approach 2:
The sealing plug is nested inside the carrier cap, with the softer elastomeric component placed within the rigid outer structure. This nested arrangement allows the two components to be manufactured separately and then easily assembled together through simple insertion
3Reliability
If a rigid carrier cap with soft sealing plug is used, then the sealing effect is improved, but the cost of materials and manufacturing increases
Solution Approach 1:
The invention specifies appropriate material hardness parameters: the carrier cap is made with a higher hardness (rigid plastic or metal) for structural integrity, while the sealing plug is made with lower hardness (elastomer) for sealing compliance. These parameter selections optimize sealing performance while controlling material costs
4Reliability
If the sealing plug is made of softer and more deformable material, then the sealing performance is improved, but the mechanical stability and structural strength are reduced
Solution Approach 1:
The closure system uses a composite structure where the rigid carrier cap provides mechanical strength and structural stability, while the soft elastomeric sealing plug provides sealing performance. Each material compensates for the other's weaknesses, achieving both strength and sealing without requiring the sealing plug alone to provide structural support
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 closure cap system achieves a high level of tightness, reliability, and user-friendliness, preventing unintentional medication release and ensuring the integrity of the container while being easy to handle and cost-effective.
Implementation Method 1
a sealing plug made of a material which is softer and more deformable than the carrier cap, preferably made of rubber or TPE
Implementation Method 2
the inner channel provided in the carrier cap for receiving the sealing plug is provided with a circumferential latching edge. Correspondingly, according to one aspect of the invention, the sealing plug has a peripheral latching edge adapted to it on the outside
Data Source
AI summary
A closure cap (2, 2′) for a syringe body (40, 40′) prefilled with a medicament or medical active substance is intended to reliably ensure a high degree of leak-tightness with simple handling. For this purpose, the closure cap (2, 2′) according to the invention comprises a rigid carrier cap (6, 6′) provided with an external thread (18) in a contact region (16), which has an inner channel (14) extending in a longitudinal direction, in which a sealing plug (8, 8′) made of a softer and more deformable material than the carrier cap (6, 6′), preferably made of rubber or TPE, is arranged.