Catheter Insertion System Fluid Path Optimization
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Solution Overview
Problem
Existing catheter insertion systems have elongate fluid paths that increase blood volume requirements, obscure pulsatile flow differentiation, compromise vacuum effectiveness, and elevate clotting risks due to convoluted blood flow pathways before reaching the blood flash indicator.
Innovation Solution
A catheter insertion system with a reduced fluid path design, featuring a transparent syringe barrel slidably engaged with a fixed plunger, a needle interface with O-rings, and a blood flash channel to minimize blood flow distance, allowing for efficient vacuum creation and clear observation of blood flow characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional catheter insertion system with sequential tools is used, then the insertion process can be completed with standard components, but the blood flow path becomes elongate and convoluted, increasing blood volume requirements and clotting risks
Solution Approach 1:
The patent combines the needle hub and syringe into a single integrated assembly, eliminating separate components and their associated connectors. This merging reduces the number of interfaces and shortens the fluid path from the needle tip to the blood flash indicator, thereby reducing the blood volume required and clotting risks while maintaining manufacturability with standard components
2Ease of operation
If the blood flash indicator is positioned at the distal end for ease of observation, then visual confirmation is improved, but the blood flow travel distance is doubled
Solution Approach 1:
Instead of positioning the blood flash indicator at the distal end of the catheter, the patent inverts the conventional arrangement by placing it at the proximal end within the integrated needle hub assembly. This allows blood to flow directly from the needle tip into the indicator without traveling the full length of the catheter, halving the travel distance while maintaining ease of visual confirmation through the transparent syringe barrel
3Measurement precision
If a vacuum is used to draw blood flow, then blood flash detection is enhanced, but the convoluted flow path reduces vacuum effectiveness
Solution Approach 1:
The patent extracts the blood flash indicator from the distal end of the catheter and relocates it to the proximal needle hub assembly, where it is in direct communication with the needle lumen. This extraction eliminates the convoluted flow path through the catheter, allowing the vacuum force to act directly on the blood at the needle tip without energy loss, thereby enhancing both detection precision and vacuum effectiveness
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
Reduces blood flow distance by 20-30%, enhances pulsatile flow observation, maintains vacuum effectiveness, and minimizes clotting risks, thereby improving vascular access confirmation and insertion accuracy.
Implementation Method 1
The syringe barrel is configured to slide proximally relative to one of the plunger or the housing to create a vacuum and draw a blood flow through the needle lumen and into the syringe barrel
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
Elongate blood flash flow paths can be detrimental to the operation of catheter placement systems by delaying the indication time, reducing the efficacy of the vacuum, or increasing the chance of clotting. Embodiments disclosed herein are directed to catheter placement systems with reduced blood flash fluid paths, including blood flash indicators having a proximally slidable syringe barrel and plunger that is fixedly attached to the system housing. By reversing the operation of the blood flash indicator syringe, the clinician maintains the advantages of a visual and tactile feedback while shortening the blood flow path between the needle tip and syringe barrel. Also disclosed is a needle interface structure configured to further shorten the blood flash fluid path.