Neurosurgical Catheter with Damping Layer for Backflow Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The delivery of therapeutic agents to the central nervous system is hindered by the blood-brain barrier, and conventional methods fail to ensure effective distribution due to backflow and tissue disruption caused by catheter insertion, leading to unpredictable drug distribution and potential tissue damage.
Innovation Solution
A catheter assembly with concentric tubing layers, where a stiff outer layer made of materials like fused silica or stainless steel is surrounded by a more flexible inner layer, creating an annular gap that reduces vibration and backflow by providing a damping effect, thereby minimizing tissue disruption and enhancing drug delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stiff catheter is used to maintain structural integrity, then the catheter can resist deformation during insertion, but it causes tissue disruption and vibration leading to backflow
Solution Approach 1:
The catheter is divided into multiple segments with different material properties along its length. The proximal portion uses a stiffer material for structural integrity during insertion, while the distal portion uses a more compliant material to minimize tissue disruption and backflow at the infusion site.
Solution Approach 2:
Different portions of the catheter are made from materials with different mechanical properties tailored to their specific functions. The proximal portion requires higher stiffness for handling and insertion, while the distal portion requires lower stiffness and higher compliance for gentle tissue interaction and reduced backflow.
2Object-generated harmful factors
If a flexible catheter is used to minimize tissue disruption, then the catheter reduces vibration and backflow, but it lacks structural integrity for precise placement
Solution Approach 1:
The catheter is divided into multiple segments with different material properties along its length. The proximal portion uses a stiffer material for structural integrity during insertion, while the distal portion uses a more compliant material to minimize tissue disruption and backflow at the infusion site.
Solution Approach 2:
Different portions of the catheter are made from materials with different mechanical properties tailored to their specific functions. The proximal portion requires higher stiffness for handling and insertion, while the distal portion requires lower stiffness and higher compliance for gentle tissue interaction and reduced backflow.
3Productivity
If high infusion rates are used to deliver therapeutic agents, then the delivery speed increases, but backflow along the catheter shaft increases reducing effective delivery
Solution Approach 1:
The catheter uses materials with progressively lower stiffness and higher compliance from proximal to distal portions. This gradient allows the distal tip to remain compliant at high infusion rates, preventing tissue displacement and backflow, while the proximal portion maintains sufficient stiffness for stable positioning.
Solution Approach 2:
The catheter material properties change along its length, with the distal portion having lower elastic modulus and higher compliance to accommodate high infusion rates without causing backflow, while maintaining overall catheter stability.
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 assembly effectively reduces backflow and vibration, ensuring controlled and homogeneous distribution of therapeutic agents within the brain, improving the delivery efficiency and minimizing tissue damage, thus overcoming the limitations of conventional methods.
Implementation Method 1
a second length of tubing concentric with the first length of tubing... the second material being more flexible than the first material and having a hardness of less than 50 Rockwell E... creating an annular gap that reduces vibration and backflow by providing a damping effect
Data Source
AI summary
A catheter assembly for insertion into the brain. The assembly comprises a first length of tubing made of a first material. A second material surrounds the first length of tubing, the second material being more flexible than the first material and having a hardness of less than 50 Rockwell E. The second material provides damping to the first length of tubing.