Thrombus Capture Catheter Filter with Dip-Coated Parachute Canopy
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Solution Overview
Problem
Existing thrombus capture catheters face challenges in attaching a filter with sufficient strength to the cross wire assembly, leading to potential detachment and loss of filter strength, particularly when the filter is thin-walled and designed for minimally invasive procedures.
Innovation Solution
A method involving a wire assembly coated with biocompatible filter material, where the filtering section is formed by immersing a helically arranged wire assembly in a filter material solution, allowing for a thin-walled filter with enhanced strength, using shape-memory alloys and lubricating coatings for easy assembly and removal of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the filter wall is made thinner to reduce catheter diameter for minimally invasive procedures, then the ease of passage through blood vessels is improved, but the strength of the filter is reduced
Solution Approach 1:
The filter is constructed as a composite structure combining a metallic cross-wire assembly framework with a filter membrane material. The wire assembly provides structural strength and support, while the filter membrane provides the filtering function. This composite construction allows the filter to maintain sufficient strength even with a thin wall design, resolving the contradiction between thin wall requirement for easy passage and strength requirement for functional integrity.
2Volume of moving object
If the filter is made thinner to reduce catheter size, then the minimally invasive capability is improved, but the fixation strength to cross wire assembly is reduced
Solution Approach 1:
The filter membrane is attached to the cross-wire assembly in a contracted state before the filter is deployed into the blood vessel. This preliminary attachment in the compressed configuration allows for more effective bonding or adhesion between the membrane and the wire assembly. When the filter is later expanded in the blood vessel, the pre-established fixation maintains its strength despite the thin wall design, ensuring reliable attachment throughout the procedure.
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 enables the production of filters with predetermined sizes and shapes, providing sufficient strength while maintaining a thin wall, facilitating easier passage through blood vessels and reducing complications during catheterization.
Implementation Method 1
The filter may be produced by a dip coating method
Data Source
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AI summary
It is an object to provide a filter for thrombus capture catheters with a thin wall and a sufficient strength and a method of producing the same. A filter for thrombus capture catheters is produced by a method comprising the steps of: arranging a plurality of wires so as to run helically and cross each other, thereby forming a cross wire assembly 2 with a spindle-shaped configuration, which is expanded at a middle portion 2C and converged at distal portion 2A and proximal portion 2B; and forming a parachute canopy-shaped filtering section 3 on one side of said cross wire assembly corresponding to approximately half of the spindle-shaped configuration by the dip coating method using a filter material.