Semi-permeable membrane ventricular catheter for CSF shunt clogging
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Solution Overview
Problem
Current ventricular catheters for CSF shunts are prone to obstruction due to tissue invasion and protein clogging, leading to complications such as mechanical failure, infections, and the need for risky revision surgeries.
Innovation Solution
A ventricular catheter with a semi-permeable membrane at its tip that prevents tissue and protein entry, allowing CSF flow while blocking macro-molecules and cells, and designed without openings along its wall to reduce clogging risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ventricular catheters with openings along the wall are used, then CSF flow is achieved, but tissue invasion and protein clogging occur leading to shunt obstruction
Solution Approach 1:
The patent applies a semi-permeable membrane (thin film) at the distal tip of the catheter that allows CSF molecules to pass through while blocking tissue cells and proteins. This membrane structure enables continuous CSF drainage while preventing the harmful factors of tissue invasion and protein clogging that occur with traditional open catheter designs.
Solution Approach 2:
The semi-permeable membrane functions as a porous structure with controlled pore sizes that selectively permit CSF passage while obstructing larger tissue cells and protein aggregates. This porous material design achieves the dual function of maintaining CSF flow and preventing clogging.
2Productivity
If the catheter tip is designed with openings for CSF drainage, then fluid flow is enabled, but the risk of clogging increases
Solution Approach 1:
The semi-permeable membrane at the catheter tip provides a continuous surface for CSF drainage without discrete openings that could clog. The membrane's continuous structure with distributed pores maintains drainage efficiency while inherently resisting clogging by tissue and protein.
3Reliability
If revision surgery is performed to clear clogged catheters, then shunt functionality is restored, but patient safety is compromised and complications increase
Solution Approach 1:
The semi-permeable membrane prevents tissue invasion and protein clogging from occurring in the first place by creating a physical barrier at the catheter tip. This preliminary preventive action eliminates the need for revision surgery to clear clogs, thereby avoiding surgical complications and infections.
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 catheter effectively reduces shunt obstruction by preventing tissue and protein invasion, thereby minimizing the need for surgical interventions and maintaining shunt functionality, enhancing patient safety and reducing complications.
Implementation Method 1
The distal tip of the ventricular catheter is formed with a semi-permeable membrane that allows passage of certain molecules (for example, H2O) or ions (electrolytes) but opposes to macro-molecules (proteins)
Implementation Method 2
allows passage of certain molecules (for example, H2O) or ions (electrolytes) but opposes to macro-molecules (proteins)
Data Source
AI summary
A novel ventricular catheter designed to reduce CSF shunt obstruction is disclosed comprising a tip using a membrane without any opening and capable of filtering the CSF. When the CSF flows through the membrane, neither tissue (choroid plexus, blood cells, tumor cells, suctioned ependymal tissue) nor proteins can break through the membrane, making this ventricular catheter capable of preventing obstruction from tissue invasion but also preventing clogging from protein precipitation, coagulation or flocculation along the downstream shunt system.