Catheter Insertion Fluid Path Design for Clear Blood Flash Detection
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Solution Overview
Problem
Existing catheter insertion systems have elongate fluid pathways that increase blood volume requirements, obscure pulsatile flow differentiation, compromise vacuum force, and risk clotting before blood reaches the blood flash indicator, leading to potential vessel backwalling.
Innovation Solution
A catheter insertion system with a reduced fluid path design, featuring a syringe barrel that slides proximally to create a vacuum, a fixed plunger, and O-rings to seal the needle, reducing the distance between the needle tip and the blood flash indicator, and a flexible tube for fluid communication, allowing clear observation of blood flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If blood flash indicator is positioned at distal end of insertion device for ease of observation, then observation convenience is improved, but fluid path length increases causing increased blood volume requirements and clotting risk
Solution Approach 1:
The patent inverts the conventional arrangement by positioning the blood flash indicator at the proximal end of the insertion device rather than the distal end. This inversion reduces the fluid path length from the needle tip to the indicator, minimizing blood volume requirements and clotting risk while maintaining effective vascular access confirmation through the transparent syringe barrel.
2Device complexity
If elongate flow pathway is used in catheter insertion system, then device structure is simplified, but vacuum force is compromised and blood flow observation is obscured
Solution Approach 1:
The patent extracts the blood flash indicator from the distal end of the catheter and relocates it to the proximal end within the hub assembly. This extraction shortens the fluid pathway, preserving vacuum force effectiveness and enabling clear blood flow observation without requiring a complex elongated structure.
3Measurement precision
If blood flash indicator is located distally proximate insertion site, then vascular access confirmation is improved, but pulsatile flow differentiation is obscured
Solution Approach 1:
The patent inverts the indicator position from distal to proximal, placing the blood flash indicator at the hub assembly. This proximity to the needle tip preserves the characteristics of pulsatile flow and enables clear differentiation between arterial and venous flow patterns while still confirming vascular access through the transparent syringe barrel.
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 minimizes blood volume requirements, enhances pulsatile flow observation, maintains vacuum force, and reduces clotting risk, ensuring accurate vascular access and efficient catheter placement.
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
AI summary
A method of inserting a catheter into a vasculature of a patient can include disposing the catheter into a housing. The housing can include a blood flash indicator, having a syringe plunger fixed to the housing and a syringe barrel slidable relative to the syringe plunger. The method can further include positioning the housing adjacent the vasculature, inserting a needle into the housing and through a lumen of the catheter until a distal tip of the needle extends from a distal end of the catheter, and accessing the vasculature via the distal tip of the needle. The method can further include sliding the syringe barrel in a proximal direction relative to the syringe plunger to create a vacuum in a lumen of the needle to thereby draw blood through the lumen of the needle and into the syringe barrel.