Flash Chamber for Closed IV Access Confirmation
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Solution Overview
Problem
Closed IV access devices often rely on blood flow into an extension tube for secondary confirmation of catheter placement, but this method fails when the extension tube is pre-primed with saline, preventing blood from flowing into the tube and making it difficult for clinicians to confirm proper placement.
Innovation Solution
Incorporating a flash chamber within the needle hub that allows blood to flow into the chamber when the needle tip is within a vein, providing visual confirmation of catheter placement without requiring blood to flow into the extension tube, and optionally including a path-defining structure to enhance visibility of blood flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the extension tube is pre-primed with saline solution, then the extension tube is ready for immediate use, but blood cannot flow into the extension tube to provide secondary confirmation of catheter placement
Solution Approach 1:
The device divides the confirmation function into two separate locations: the flashback chamber in the needle hub and the extension tube. This segmentation allows the flashback chamber to provide confirmation independently when the extension tube is pre-primed with saline, resolving the contradiction between readiness and reliability
Solution Approach 2:
The flashback chamber acts as an intermediary structure that provides blood flow visualization when the extension tube cannot serve this function. It mediates between the needle insertion and the extension tube, offering alternative confirmation when the primary confirmation method is unavailable
2Measurement precision
If a flashback notch is included on the needle, then primary confirmation of needle placement is provided, but secondary confirmation of catheter placement cannot be achieved
Solution Approach 1:
The invention adds a new spatial dimension for confirmation by placing a flashback chamber in the needle hub, separate from the extension tube confirmation method. This creates an additional visualization pathway that provides catheter placement confirmation without relying on blood flow into the extension tube
3Reliability
If the extension tube is used for secondary confirmation, then catheter placement can be verified, but the device complexity increases with multiple confirmation pathways
Solution Approach 1:
The flashback chamber is integrated into the needle hub structure, merging the confirmation function with an existing component rather than adding a separate device. This reduces overall system complexity while maintaining the reliability of catheter placement verification
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
Enables reliable secondary confirmation of catheter placement even when the extension tube is pre-primed with saline, ensuring accurate needle placement and reducing the risk of catheter displacement during needle withdrawal.
Implementation Method 1
allowing blood to flow into the flash chamber when a distal tip of the needle is contained within a patient's vein
Implementation Method 2
The flash chamber can include a path-defining structure to facilitate identifying whether blood is continually flowing into the flash chamber
Data Source
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AI summary
An IV access device (200) comprising: a catheter adapter (201); a catheter (201a) extending distally from the catheter adapter (201); a needle (202a); and a needle hub (202) coupled to the catheter adapter (201), wherein a proximal end of the needle (202a) is secured within the needle hub (202) and the needle (202a) extends through the catheter (201a), wherein the needle hub (202) comprises a flash chamber (210), a path-defining structure (800, 900) disposed within the flash chamber (210), and a visualization channel (903). The flash chamber can be used to provide visual confirmation of proper catheter placement within a vein. The path-defining structure facilitates identifying whether blood is continually flowing into the flash chamber.