Cannula View Window Structure for Dual Flashback Visibility
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Solution Overview
Problem
Existing catheter devices face challenges in balancing the speed of flashback response, risk of blood leakage, and proximal visibility during deep vein access, particularly in obese patients or when using distally oriented fenestrations.
Innovation Solution
A catheter insertion device with a cannula featuring a fenestration and a flat relief portion that provides dual flashback responses, allowing separate visual confirmation of cannula and catheter entry into the blood vessel, with a transparent seal member to convert the fenestration into a viewing window and minimize blood leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the cannula fenestration is positioned distally close to the distal opening to minimize flashback response time, then the flashback response speed is improved, but the visibility of the flashback response becomes difficult when the catheter is inserted deep under the skin
Solution Approach 1:
The patent divides the flashback detection function into two separate components: a distal fenestration for rapid blood detection and a proximal viewing window for easy visualization. This segmentation allows each component to be optimized for its specific function - the distal fenestration minimizes response time while the proximal viewing window ensures visibility, resolving the contradiction between speed and detectability.
2Reliability
If the cannula fenestration is positioned distally close to the distal opening to reduce blood leakage risk, then the reliability is improved, but the visibility of blood flow becomes difficult in deep vein access
Solution Approach 1:
The patent separates the blood detection function (distal fenestration) from the visualization function (proximal viewing window). The distal fenestration is positioned to minimize leakage risk while the proximal viewing window provides enhanced visibility of blood flow, allowing both reliability and detectability to be optimized simultaneously.
3Difficulty of detecting and measuring
If a transparent seal member is added over the fenestration to create a viewing capsule, then the visibility of flashback response is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the viewing window assembly: the transparent seal member simultaneously provides blood leakage prevention, creates a viewing capsule for enhanced visibility, and maintains structural integrity. This merging of functions achieves improved visibility without adding excessive complexity, as a single component performs multiple critical roles.
Data Source
AI summary
In various embodiments, an improved catheter insertion device is described that provides an improved flashback response and use for deep vein access. In various embodiments, the improved flashback response comprises two separate and distinct flash events, the first indicating insertion of a cannula in a blood vessel, and a second indicating insertion of a catheter in the blood vessel. The two flash responses are made possible by a combination of features provided on the cannula, such as including a view window in the cannula and a flat relief portion on the outer surface of the cannula at the distal opening.