Flashback Chamber Visual Enhancement via Contrasting Member
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Solution Overview
Problem
Existing vascular access devices, such as IV catheters, face challenges in visualizing blood flashback, especially in low light conditions or on patients with dark complexions, due to the difficulty in distinguishing blood against darker backgrounds, which can lead to delayed detection and improper catheter placement.
Innovation Solution
A vascular access device with a hub assembly featuring a transparent window section and a contrasting member on the hub assembly, providing a high-contrast background for enhanced visualization of blood in the flashback chamber, facilitating earlier detection and simplifying the structure, manufacture, and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent flashback chamber is used, then the structure remains simple and manufacturing is easy, but blood visualization becomes difficult in low light conditions or against dark backgrounds
Solution Approach 1:
The patent applies a contrasting member (white or light-colored) to the hub assembly background behind the flashback chamber. This color change principle creates high visual contrast between the blood (dark red) and the background (white/light), significantly improving flashback visibility in low light conditions and on patients with dark complexions without requiring complex structural modifications
Solution Approach 2:
The contrasting member acts as an intermediary element between the transparent chamber and the external environment. It mediates the visual perception by providing a standardized high-contrast background that enhances blood visibility without altering the chamber's transparency or requiring complex illumination systems
2Illumination intensity
If the flashback chamber background is made dark or opaque, then contrast might be improved, but light transmission and overall visibility are reduced
Solution Approach 1:
The patent applies the contrasting member only in the specific region where flashback visualization is needed (the background of the chamber), while maintaining the transparency of the chamber walls and other areas. This localized application of contrast enhancement preserves light transmission and overall visibility while improving blood detection accuracy in the critical viewing area
3Measurement precision
If a complex illumination system is added to enhance flashback visibility, then detection accuracy improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The contrasting member utilizes ambient light and the natural color properties of blood to create high-contrast visualization. The white/light background passively reflects available light and provides inherent contrast with dark red blood, eliminating the need for active illumination systems, LEDs, or complex optical components while maintaining high detection accuracy
Data Source
AI summary
Featured is a medical infusion device for vascular access with enhanced flashback visualization that includes a hub assembly having a flashback chamber. The hub assembly includes a proximal portion, a distal portion and a substantially transparent window section intermediate the proximal portion and distal portion. A needle is coupled to the flashback chamber so that fluid flows through the lumen of the needle into the flashback chamber after the needle is inserted into a blood vessel. A contrasting member is disposed on at least a portion of the hub assembly, so that when blood enters the flashback chamber, the contrasting member provides a high-contrast background when viewed through the window section.