Medical Rubber Plug with Segmented Piercing Space for Leak Control
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Solution Overview
Problem
Existing medical rubber plugs allow residual liquid to leak from medical containers when an injection needle is pulled out, leading to scattering of the liquid.
Innovation Solution
A medical rubber plug design featuring a capping portion and a leg portion with a non-adhered first and second portion in the piercing region, allowing for elastic deformation and creation of a buffer space to accommodate leaked liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a medical rubber plug is used for sealing a vial, then sealing performance and prevention of contamination are improved, but residual liquid leaks from the piercing gap when the injection needle is pulled out
Solution Approach 1:
The piercing portion is divided into a first portion (lower part near leg portion) and a second portion (upper part near capping portion), which are not adhered to each other. This segmentation creates a potential space between the two portions that can accommodate residual liquid, preventing it from leaking outward while maintaining the sealing function of the plug.
Solution Approach 2:
A film is introduced as an intermediary element between the first and second portions of the piercing portion. This film maintains the structural integrity of the plug while creating a buffer space that captures residual liquid, effectively mediating between the sealing requirement and the liquid leakage problem.
2Strength
If the first and second portions of the piercing portion are adhered together, then structural integrity is improved, but residual liquid cannot be contained and leaks outward
Solution Approach 1:
The piercing portion is segmented into two non-adhered portions, creating a deliberate separation that forms a containment space for residual liquid. This segmentation sacrifices some adhesion strength in the piercing region to gain liquid containment capability, which is the priority for preventing leakage.
Solution Approach 2:
Different regions of the piercing portion have different adhesion characteristics. The first and second portions are specifically designed with non-adhered interfaces at critical locations to create liquid containment spaces, while other regions maintain normal adhesion to preserve overall structural integrity.
3Ease of manufacture
If a single-layer rubber structure is used, then manufacturing simplicity is maintained, but liquid containment capability is insufficient
Solution Approach 1:
The medical rubber plug uses a composite structure combining rubber material with an intermediate film layer. This composite design adds liquid containment functionality while maintaining manufacturing feasibility through established lamination and molding techniques, balancing complexity increase with functional improvement.
Solution Approach 2:
The film is nested within the piercing portion structure, positioned between the first and second portions. This nested configuration integrates the liquid containment function into the existing plug structure without requiring a completely new design, thus limiting the increase in manufacturing complexity.
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
Prevents residual liquid leakage by creating a space to contain the liquid, reducing spillage and maintaining containment integrity.
Implementation Method 1
the first portion and the second portion are adjacent to each other in an up/down direction, and are not adhered to each other
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
An object of the present disclosure is to provide a medical rubber plug through which little residual liquid in a medical container leaks even when an injection needle is pulled out from the medical rubber plug. The medical rubber plug of the present disclosure is a medical plug including: a capping portion; and a leg portion extending downward from the capping portion, wherein the medical rubber plug includes a piercing portion in which a first portion located on the leg portion side and a second portion located on an upper surface side of the first portion are provided, and the first portion and the second portion are not adhered to each other.