Plunger-Activated Luer Cap Sealing for IV Catheter Reflux Prevention
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Solution Overview
Problem
Intravenous catheters are susceptible to clotting and infection due to blood stagnation and the introduction of microorganisms during repeated access, and existing flush systems fail to prevent reflux effectively.
Innovation Solution
A plunger-activated capping system with a luer cap and plug that seals the fluid outlet of a syringe, preventing reflux by frictionally retaining the luer cap within the syringe body and using an elastomeric luer cap plug to secure the seal, allowing for easy connection and disconnection without introducing bacteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reusable valve structure is used for catheter access, then the catheter can be accessed multiple times for flushing, but repeated access increases the potential for introducing bacteria and microorganisms leading to infection
Solution Approach 1:
The system employs a disposable syringe with a pre-attached luer cap that is discarded after a single use. The luer cap remains on the catheter after the syringe is removed, providing a permanent seal without requiring reusable valve structures. This eliminates the need for repeated access through reusable components, thereby preventing bacterial introduction while maintaining productivity.
2Ease of operation
If conventional valve structures are used, then flushing can be performed, but these valve structures fail to eliminate reflux of fluid or blood into the distal end of the catheter
Solution Approach 1:
The luer cap is pre-attached to the syringe body before use and remains on the catheter after the syringe is removed. This preliminary positioning ensures that the catheter is sealed immediately after flushing, preventing reflux before it can occur. The cap is designed to stay securely on the catheter without requiring additional actions from the user.
3Ease of operation
If a luer cap is frictionally retained in the syringe body, then the cap can be easily connected and disconnected, but the cap must be securely retained to prevent leakage during flushing
Solution Approach 1:
The luer cap features localized friction retention ribs that provide sufficient holding force during the flushing operation. These ribs are strategically positioned to create friction engagement with the syringe body hub, ensuring the cap remains securely retained during use while allowing for deliberate removal when needed. The friction fit provides the necessary reliability without compromising ease of operation.
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 system effectively prevents reflux and infection by ensuring a secure seal when the syringe is detached from the catheter, reducing the risk of clotting and bacterial introduction, thus providing a safe and efficient method for flushing and sealing IV catheters.
Implementation Method 1
The luer cap plug is configured to seal the fluid outlet of the luer cap when the plunger assembly is moved to the advanced position
Implementation Method 2
The luer cap plug can be formed from an elastomeric material and is retained on the finger by friction
Implementation Method 3
An outer surface of the luer cap can include a first plurality of spaced longitudinally extending ribs and an inner surface of the hub portion of the syringe body can include a second plurality of spaced longitudinally extending ribs which define channels dimensioned to slidably receive the first plurality of spaced longitudinally extending ribs to frictionally retain the luer cap within the hub portion of the syringe body
Data Source
AI summary
A plunger activated capping system is disclosed which includes a syringe body defining a fluid reservoir, a plunger assembly including a plunger rod and a sealing member supported on the plunger rod, and a luer cap releasably secured to a distal end of the syringe body. The luer cap includes a luer-type connector member and a fluid outlet. A luer cap plug is releasably supported on a distal end of the plunger rod at a location distally of the sealing member. The luer cap plug is movable into engagement with the luer cap to seal the fluid outlet of the luer cap upon advancement of the plunger assembly from a retracted position to an advanced position. The plunger assembly is configured to effect disengagement of the luer cap from the distal end of the syringe body when the plunger assembly is moved to the advanced position.