Flushable Catheter Septum Activator for Stagnant Flow Control
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Solution Overview
Problem
Current infusion therapies face complications due to regions of stagnant fluid flow in vascular access devices and extravascular systems, leading to trapped blood, air bubbles, and residual medications, which can cause infections, tissue damage, and unintended medication interactions.
Innovation Solution
A flushable peripheral IV catheter assembly with a septum and septum activator that allows controlled fluid flow, preventing stagnant flow regions by using a flexible septum with a slit or hole that can be opened for fluid passage, and air vents to relieve positive pressure, ensuring proper flashback and fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a septum is used to prevent blood flow during catheter placement, then blood exposure is prevented, but fluid flow stagnation occurs leading to trapped air bubbles and medications
Solution Approach 1:
The valve mechanism transitions from a static closed state to a dynamic open state through actuation. The septum is initially closed to prevent blood exposure, then can be opened on demand to restore fluid flow, allowing the system to adapt between protective and functional states as needed during different phases of catheter usage
Solution Approach 2:
The valve changes its flow resistance parameter from high (closed) to low (open) through actuation. This parameter change allows the system to control fluid flow dynamics, preventing stagnation when open while maintaining blood containment when closed, thus resolving the contradiction between protection and flow reliability
2Object-affected harmful factors
If manual occlusion of the vein is performed to prevent blood exposure, then blood exposure is reduced, but the procedure complexity increases
Solution Approach 1:
The valve mechanism provides automatic blood containment without requiring manual vein occlusion by the clinician. The septum self-seals to prevent blood exposure during catheter placement, then can be actuated to enable fluid flow, eliminating the need for manual intervention and reducing procedural complexity
Solution Approach 2:
The valve acts as an intermediary mechanism between the catheter and the external environment. It mediates blood containment during insertion while allowing controlled fluid flow during infusion, replacing the need for manual occlusion and simplifying the overall procedure
3Object-affected harmful factors
If positive pressure is applied in the IV line to prevent blood exposure, then blood exposure is prevented, but flashback is prevented
Solution Approach 1:
The valve dynamically switches between a closed state that contains blood and prevents exposure, and an open state that allows flashback confirmation. This dynamic control enables both blood protection and accurate placement verification at different stages without compromising either function
Solution Approach 2:
The valve is pre-configured in a closed state during catheter insertion to prevent blood exposure. After safe placement is confirmed, the valve is then actuated to an open state to allow flashback verification, ensuring blood protection is established before flashback is needed
4Object-affected harmful factors
If the catheter assembly is designed with a valve mechanism, then blood exposure is controlled, but device complexity increases
Solution Approach 1:
The valve mechanism is integrated into the catheter adapter assembly, merging the blood containment function with the existing catheter structure. This integration allows controlled blood exposure prevention without adding separate complex components, as the valve is incorporated into the adapter that is already part of the catheter system
Solution Approach 2:
The valve mechanism serves multiple functions: preventing blood exposure during insertion, allowing flashback confirmation, enabling fluid flow control, and preventing medication interaction. This multi-functionality justifies the added complexity by providing comprehensive control in a single integrated component
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 enables controlled, desirable flashback without blood exposure and reduces the risk of fluid stagnation, preventing complications such as infection and tissue damage by ensuring proper fluid flow and preventing air bubbles and residual medications from entering the vascular system.
Implementation Method 1
A septum is positioned within a lumen of the catheter assembly to prevent or limit flow of a fluid through the catheter adapter. The septum generally includes a pathway that is closed prior to being opened or activated by a probe or septum activator positioned within the lumen of the catheter adapter.
Implementation Method 2
At least one ventilation channel is interposed between the septum and the groove to permit air flow through the catheter adapter prior to the slit being opened. The air vents prevent buildup of positive pressure within the catheter adapter thereby permitting flashback of blood into the catheter and a forward chamber of the catheter adapter.
Implementation Method 3
The probing end of the septum activator is advanced through the pathway of the septum when a probe is inserted into the proximal opening of the catheter adapter. As the probe contacts the contact surface of the septum activator, the septum activator is advanced in a distal direction through the catheter adapter whereupon the probing end of the septum activator opens the pathway through the septum.
Data Source
Figure 1~3
Figure 4
Figure 5A
AI summary
A flushable catheter assembly (300) having features to enable selective activation of fluid flow through the catheter assembly is disclosed herein. A septum (356) is placed within the catheter adapter (314) of the catheter assembly and includes a pathway that is closed prior to being biased open via a septum activator (380) also positioned within the catheter adapter. A plurality of air vent channels (70) is interposed between the septum and the inner surface (60) of the catheter adapter to permit "flashback" of blood during insertion of the catheter into a patient. The septum activator is advanced through the pathway of the septum as a coupler is attached to a proximal opening of the catheter adapter.