Male Luer Tip Flow Diverter for Dead Space Flushing
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Solution Overview
Problem
Standard male luer tips in vascular access devices (VADs) create a circumferential 'dead space' that is difficult to flush, leading to residual blood accumulation and increased risk of microbial colonization and infection.
Innovation Solution
A luer connection device with a male luer tip featuring a flow diverter and/or flow expansion channel that directs fluid flow to the periphery of the connecting female luer space, enhancing mixing and turbulence to improve flushing efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard male luer tip geometry is used, then device simplicity is maintained, but circumferential dead space remains difficult to flush
Solution Approach 1:
The luer tip internal geometry is segmented into distinct functional zones: a central flow path and a circumferential dead space. The flow diverter creates separate flow paths that direct fluid through the dead space, while the flow expansion channel divides the flow into multiple streams to enhance mixing and flushing effectiveness.
Solution Approach 2:
The invention introduces dimensional features within the luer tip geometry, specifically the flow diverter extending radially outward and the flow expansion channel with varying cross-sectional area. These dimensional modifications create turbulence and enhance fluid mixing in the previously stagnant circumferential dead space.
2Reliability
If standard male luer tip is used, then manufacturing simplicity is maintained, but blood and residue accumulate in dead space
Solution Approach 1:
The flow diverter and flow expansion channel are designed into the luer tip structure during manufacturing, creating pre-conditioned flow paths that actively prevent blood and residue accumulation. The geometry is configured to ensure fluid continuously contacts and flushes the circumferential dead space, eliminating the need for post-manufacturing cleaning interventions.
Solution Approach 2:
The internal geometry parameters of the luer tip are modified to create specific flow characteristics. The flow expansion channel has a gradually varying cross-sectional area that transforms laminar flow into turbulent flow, while the flow diverter angles and positions are optimized to maximize fluid mixing and dead space flushing efficiency.
3Ease of operation
If pulsatile flushing technique is used, then some mixing improvement is achieved, but dead space flushing remains insufficient
Solution Approach 1:
The luer tip geometry is designed to be self-flushing through its inherent flow dynamics. The flow diverter and flow expansion channel create continuous turbulence and mixing that automatically flush the circumferential dead space without requiring external pulsatile manipulation. The device structure itself performs the flushing function that previously required complex operational techniques.
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 device effectively removes blood and residue from the dead space, reducing the risk of infection by increasing fluid mixing and turbulence, thereby improving the flush procedure.
Implementation Method 1
The effectiveness of the flushing procedure in intravenous therapy is related to the risk of microbial colonization and potential Catheter Related Bloodstream Infection (CRBSI). Standard male luer tip geometries result in a circumferential 'dead space' in the fluid path distal to the male luer tip that is inherently difficult to flush.
Implementation Method 2
a flow expansion channel disposed in the lumen tapering outward from the side wall of the housing and partially extending along a longitudinal axis from the tip opening toward the proximal end for increasing mixing and flow through a circumferential dead space in the fluid path distal to the male luer tip
Data Source
AI summary
A luer connection device is disclosed having a housing including a side wall having an inside surface defining a lumen with a central axis, a proximal end, and a distal end including a male luer tip having a central flow diverter extending outwardly from the central axis to direct a fluid to a circumferential dead space distal to the male luer tip. A luer connection device is also disclosed having a flow expansion channel disposed in the lumen tapering outward from the wall of the housing and partially extending along a longitudinal axis from the tip opening toward the proximal end for increasing mixing and flow through a circumferential dead space in the fluid path distal to the male luer tip.