Vascular Access Membrane Pores for Pathogen Shear
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Solution Overview
Problem
Current vascular access devices are prone to catheter-related bloodstream infections (CRBSIs) due to pathogen adherence and biofilm formation, which are resistant to biocidal agents and increase with indwelling periods, leading to significant morbidity and mortality.
Innovation Solution
A vascular access device with a membrane that discourages pathogen adhesion by incorporating antimicrobial agents and lubricants, which are transferred through pores or a reservoir, and can be connected to a vacuum source to pull and shear pathogens, thereby reducing the risk of biofilm formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a vascular access device is used for long-term indwelling, then the duration of therapy is extended, but the risk of pathogen adherence and biofilm formation increases
Solution Approach 1:
The patent applies preliminary action by pre-coating the catheter surface with antimicrobial agents (such as silver ions, chlorhexidine, or other biocidal substances) before insertion. This pre-established protective layer actively prevents pathogen adherence from the outset during the indwelling period, addressing the contradiction by preparing the surface in advance to resist biological contamination over time.
Solution Approach 2:
The patent employs self-service through catheters with self-cleaning or self-disinfecting surfaces that actively release antimicrobial agents or possess inherent properties (such as hydrophobic coatings or electrostatic repulsion) that continuously prevent biofilm formation. The catheter maintains its own protective function throughout the indwelling period without requiring external intervention, thereby extending safe use duration while resisting pathogen adherence.
2Object-affected harmful factors
If biocidal agents are applied to the vascular access device, then pathogen colonization is reduced, but resistance to biocidal agents develops
Solution Approach 1:
The patent applies local quality by creating spatially differentiated zones on the catheter surface with varying concentrations or types of antimicrobial agents. Different sections of the catheter may have different coatings (e.g., silver ions at the insertion site, chlorhexidine along the shaft), which prevents pathogens from developing uniform resistance across all surfaces while maintaining effective local protection against colonization.
Solution Approach 2:
The patent employs composite materials by combining multiple antimicrobial mechanisms or materials (such as silver nanoparticles with polymer coatings, or layered structures with different biocidal properties) on the catheter surface. This multi-component approach ensures that pathogens cannot easily develop resistance to all components simultaneously, thereby maintaining reliability of pathogen prevention while reducing colonization risk.
3Object-affected harmful factors
If a membrane with pores is used to transfer antimicrobial agents, then pathogen adhesion is discouraged, but the device complexity increases
Solution Approach 1:
The patent applies porous materials by using a membrane with controlled pore structures that allow antimicrobial agents to be transferred to the catheter surface while physically blocking or discouraging pathogen adhesion. The porous structure provides both the functional benefit of agent delivery and the mechanical benefit of reducing pathogen attachment, addressing the contradiction by using the material's inherent properties rather than adding complex external systems.
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 solution effectively limits pathogen colonization and proliferation, decreasing the incidence of bloodstream infections by creating an antimicrobial barrier and removing pathogens from the device, thus reducing the risk of CRBSIs.
Implementation Method 1
The membrane may include one or more pores through which an antimicrobial fluid may be transferred from the vascular access device, through the pores, and into the fluid path of the vascular access device.
Implementation Method 2
The vascular access device may also be connected to a source of vacuum that communicates with the membrane. The membrane may include one or more pores, and the source of vacuum may pull one or more pathogens into one or more of the pores.
Implementation Method 3
As a pathogen is pulled into a pore, the membrane may shear the pathogen.
Data Source
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AI summary
A medical device may include a vascular access device having a body and a membrane of the body. The membrane communicates with a pathogenic environment and discourages adhesion of a pathogen to the membrane. A method of discouraging a pathogen from residing on the membrane of a vascular access device includes providing a vascular access device with a body having a membrane and discouraging a pathogen from residing on the membrane.