IV Needle Hub Flash Chamber for Vein Placement Confirmation
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Solution Overview
Problem
Existing closed IV access devices struggle to provide secondary confirmation of proper catheter placement when the extension tube is pre-primed with saline, as blood flow into the extension tube is prevented, making it difficult for clinicians to confirm catheter tip positioning within a vein.
Innovation Solution
Incorporating a flash chamber into the needle hub that allows blood to flow into a visible chamber for secondary confirmation of catheter placement, even when the extension tube is pre-primed with saline, and optionally using a path-defining structure to enhance visibility of blood flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the extension tube is pre-primed with saline solution, then the device maintains a closed system and prevents air entry, but blood flow into the extension tube is blocked preventing secondary confirmation of catheter placement
Solution Approach 1:
The device divides the fluid path into separate segments: the extension tube for saline priming and the flash chamber for blood collection. The flash chamber is positioned adjacent to the needle hub and connected via a separate pathway, allowing blood to be directed to the flash chamber independently from the saline-filled extension tube. This segmentation enables both functions to operate simultaneously without interfering with each other.
Solution Approach 2:
The flash chamber acts as an intermediary structure between the needle hub and the extension tube system. It provides a dedicated space where blood can accumulate and become visible without mixing with or displacing the saline in the extension tube. The flash chamber includes a visible window or indicator that allows clinicians to observe blood presence as confirmation of proper catheter placement.
2Loss of information
If blood flow is required for confirmation, then catheter placement can be verified, but the system cannot maintain a pre-primed closed configuration
Solution Approach 1:
The flash chamber is integrated into the needle hub assembly, merging the confirmation function directly into the existing injection hub structure. This integration allows the flash chamber to be part of the closed system while providing separate blood collection capability. The merged design eliminates the need for separate confirmation devices and maintains the closed-system advantage.
Solution Approach 2:
The flash chamber utilizes a spatial dimension adjacent to the needle hub, creating a side-by-side configuration rather than a sequential flow path. This dimensional arrangement allows blood to be collected and visualized in a separate plane from the main saline flow path, enabling simultaneous operation of both the pre-primed extension tube and the blood-filled flash chamber without requiring complex flow management.
3Loss of information
If the extension tube is used for blood flow confirmation, then visual feedback is provided, but the confirmation is unreliable when saline is present
Solution Approach 1:
The flash chamber is designed with specific local characteristics: a transparent or translucent wall forming a visible window, and a positioning that places it in direct communication with the needle hub's blood flow path. These local quality features ensure that only blood (not saline) accumulates in the flash chamber and that the accumulation is clearly visible through the specialized window design, providing reliable visual confirmation distinct from the saline-filled extension tube.
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 visual confirmation of catheter placement within a vein, ensuring proper positioning without relying on blood flow into the extension tube, thereby improving the accuracy of catheter insertion.
Implementation Method 1
The vent plug can allow air to escape from extension tube 103 thereby allowing the patient's blood pressure to cause blood to flow into extension tube 103
Data Source
AI summary
An IV access device can include a needle hub that incorporates a flash chamber. The flash chamber can be used to provide visual confirmation of proper catheter placement within a vein. The flash chamber can include a path-defining structure to facilitate identifying whether blood is continually flowing into the flash chamber. The flash chamber may also be removable from the needle hub. In some cases, the needle hub may include a paddle grip that facilitates insertion of the catheter and separation of the needle hub from the catheter adapter.