Piercing Part Tapered Mandrel Low-Force Seal Penetration
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Solution Overview
Problem
Existing medical infusion systems pose a risk of injury and require high force to pierce liquid containers, which is undesirable for safe and efficient operation.
Innovation Solution
A piercing part with a mandrel tip featuring tapered, inclined jacket surface parts that widen towards the drip chamber, minimizing the risk of injury and allowing for low-force piercing, along with a ventilation channel to prevent air and liquid mixing, and a smooth cutting face for consistent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional piercing mandrel with a pointed tip is used, then the piercing action is effective, but the risk of injury increases and high force is required
Solution Approach 1:
The piercing mandrel is divided into functionally distinct surface parts: a first jacket surface part with a tapered contour for initial penetration, and a second jacket surface part with an inclined cutting face for controlled cutting. This segmentation allows each part to perform its specific function optimally, reducing the overall force required while maintaining safety.
Solution Approach 2:
Different regions of the mandrel tip are given different geometric properties: the first jacket surface part has a tapered contour for progressive penetration, while the second jacket surface part has a specific inclined cutting face angle (30-70 degrees) for controlled cutting action. This local differentiation of geometric quality enables low-force piercing with reduced injury risk.
2Ease of operation
If the mandrel tip is made sharp for easy piercing, then piercing force is reduced, but control over the piercing process is lost
Solution Approach 1:
The mandrel tip is segmented into two functional zones: the first jacket surface part that progressively penetrates the seal, and the second jacket surface part with the inclined cutting face that provides controlled cutting action. This segmentation ensures that the piercing process remains controllable while requiring minimal force.
Solution Approach 2:
The first jacket surface part performs a preliminary tapered penetration action before the second jacket surface part executes the final cutting action. This preliminary action prepares the path for controlled cutting, ensuring both ease of piercing and process control.
3Ease of operation
If the cutting face is continuous for smooth piercing, then piercing resistance is constant, but the structure becomes more complex
Solution Approach 1:
The cutting face is segmented into distinct functional zones: the first jacket surface part with tapered contour and the second jacket surface part with inclined cutting face. This segmentation maintains structural simplicity while achieving constant piercing resistance through the coordinated action of the two parts.
Solution Approach 2:
Each segment of the cutting face has optimized local geometry: the first part has a tapered contour for progressive penetration with constant resistance, while the second part has an inclined cutting face at 30-70 degrees for controlled cutting. This local quality differentiation achieves consistent piercing resistance without structural 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
The solution reduces the risk of injury and allows for easy, low-force piercing of liquid containers while minimizing air and liquid mixing, ensuring safe and efficient operation of the infusion system.
Implementation Method 1
the piercing mandrel, with relatively low force applied by an operator, is able to pierce a pierceable seal or a closure plug of a liquid container
Implementation Method 2
an opening of a ventilation channel is provided in the first jacket surface part, which opening is provided opposite the cutting face of the second jacket surface part
Data Source
AI summary
A piercing part for a medical infusion system includes a piercing mandrel through which at least one channel extends and which has a mandrel tip whose first jacket surface part is tapered, relative to a central longitudinal axis, towards a front end. An opposite second jacket surface part has an inclined cutting face interrupted towards the front end. The piercing part can be used for medical transfusion and infusion appliances.