Introducer Needle Notches for Flashback Visualization
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Solution Overview
Problem
The challenge in IV catheter placement is the difficulty in visualizing flashback due to saline priming, which slows down blood flow and makes it hard to confirm proper placement, especially in integrated systems without a flash chamber, leading to potential misplacement and increased time for air purging.
Innovation Solution
An introducer needle with a first and second notch, along with a flash chamber and gas permeable vent, facilitates pressure-driven blood flow for improved flashback visibility, even after priming, by creating separate pathways for blood and priming fluid, and allowing air to escape, ensuring rapid and clear visualization of transfixion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If saline priming is used to fill the catheter and needle lumen, then air pockets are reduced or eliminated, but flashback is slowed due to diffusion and becomes difficult to visualize
Solution Approach 1:
The needle wall is segmented with multiple notches that create separate pathways: one for priming fluid to reach the distal tip, and another for blood to flashback to a specific visualization point. This segmentation allows priming and flashback functions to occur simultaneously without interference.
Solution Approach 2:
The notches act as intermediary structures that facilitate the transition from priming fluid to blood flashback. They provide a designated exit point for blood to reach the interface between the needle and catheter, creating a clear visualization point separate from the priming fluid pathway.
2Device complexity
If integrated IV catheter systems without flash chamber are used, then device complexity is reduced, but flashback visibility and transfixation observation are compromised
Solution Approach 1:
Instead of requiring a separate flash chamber, the invention creates a localized flashback interface at the needle-catheter junction. The notches ensure blood reaches this specific location for visualization, providing adequate flashback without adding overall system complexity.
3Reliability
If clinician waits for blood to flow through the entire integrated IV catheter system to purge air, then air is removed from the system, but the process becomes time consuming
Solution Approach 1:
The catheter is pre-filled with priming fluid up to the notches before needle insertion. This preliminary action ensures that when blood flashback occurs, it can be immediately visualized at the needle-catheter interface without waiting for blood to travel through the entire catheter length, significantly reducing priming time.
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 enhances the quality and speed of flashback, improving the success rate of needle placement and reducing the time required for air purging, allowing for quicker and more reliable confirmation of IV catheter placement within the vasculature.
Implementation Method 1
the flash chamber may include a gas permeable vent
Implementation Method 2
blood may flow proximally through a needle lumen, exit the needle lumen through the notch
Data Source
AI summary
A catheter system may include a catheter adapter, a catheter extending distally from the catheter adapter, an introducer needle extending through the catheter, a flash chamber in fluid communication with a needle lumen of the introducer needle, and a seal element. The introducer needle may include a wall defining the needle lumen, a first notch formed through the wall, and a second notch formed through the wall. The seal element may be proximal to the first notch and the second notch and within the catheter between an outer surface of the introducer needle and an inner surface of the catheter. The seal element may prevent priming fluid from travelling distal to the seal element. The seal element in conjunction with the first notch, the second notch, and the flash chamber may facilitate pressure-driven blood flow into the catheter for detection of flashback and transfixing when priming occurs prior to insertion into vasculature.