Catheter Distal End Knife-Edge Perforation Design
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Solution Overview
Problem
Existing catheter devices lack sufficient drilling ability against hard clot areas and stent-retaining ability, and have poor insertion-slidability into blood vessels, limiting their effectiveness in treating obstructed regions.
Innovation Solution
A catheter device with a flexible hollow tube body formed by cylindrically stranding austenitic stainless steel wires, featuring a convex-concave inner surface and a knife-edge circular front at the distal end, which provides enhanced drilling capability and smooth outer surface for improved insertion and rotation within blood vessels, along with a multi-layered structure for adjustable rigidity and torque transmissibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a hollow tube structure with metallic wires is used, then weight per unit length is reduced and flexibility is improved, but drilling ability against hard clot areas deteriorates
Solution Approach 1:
The catheter employs different structural configurations at different locations: the distal end features a solid configuration with reinforced structure for drilling hard clot areas, while the proximal portion maintains a hollow tube structure with metallic wires for reduced weight and improved flexibility. This local differentiation allows each section to optimize its properties for its specific function.
Solution Approach 2:
The catheter is divided into distinct functional segments: a distal end portion designed for perforation and drilling with solid construction, and a proximal portion designed for manipulation and navigation with hollow tube structure. This segmentation allows independent optimization of each segment's properties without compromising the other.
2Stability of the object's composition
If a hollow tube structure with metallic wires is used, then flexibility is improved, but stent-retaining ability deteriorates
Solution Approach 1:
The catheter structure transitions from a flexible hollow tube configuration in the proximal portion to a more rigid solid configuration at the distal end. This local quality variation allows the proximal section to maintain flexibility for navigation while the distal section provides sufficient strength for stent retention and deployment.
Solution Approach 2:
The catheter incorporates composite construction combining metallic wires within a tube structure, creating a material composition that balances flexibility and strength. The metallic wire reinforcement provides structural integrity for stent retention while the overall tube structure maintains necessary flexibility.
3Force
If a hollow tube structure with metallic wires is used, then torque transmissibility is improved, but insertion-slidability into blood vessel deteriorates
Solution Approach 1:
The catheter features a hollow tube structure with metallic wires in the proximal portion for high torque transmissibility, while the distal end employs a streamlined solid configuration that reduces friction and improves insertion-slidability into the blood vessel. This local differentiation resolves the contradiction between torque transmission and insertion ease.
Data Source
AI summary
A catheter device (K, K1, K2 and K3) has a flexible hollow tube body (1) formed by a plurality of austenitic stainless steel wires (2) cylindrically stranded to provide a hollow structure. An inner surface of the flexible hollow tube body (1) has a convex-concave structure represented by the stainless steel wires (2) to provide helical grooves (30). A leading distal end of the flexible hollow tube body (1) is formed into a knife-edge circle configuration to provide a knife-edge circle front (3), thus imparting a perforative capability to improve its quality and performance.