Sheath Assembly Multi-Layer Structure Axial Support Bending Compliance
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Solution Overview
Problem
The existing interventional instrument delivery systems face challenges in navigating the tortuous vascular system due to mechanical performance requirements such as axial support and bending compliance, which affect safety and control during operation.
Innovation Solution
A sheath assembly with a multi-layer structure, including an inner lining tube, a metal tube, and an outer wrapping membrane, featuring elastic expansion pieces and connectors for improved axial support and bending compliance, allowing for precise control and orientation of the distal end during delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-layer sheath structure is used, then the device complexity is reduced, but the axial support performance and bending compliance are insufficient
Solution Approach 1:
The sheath employs a multi-layer composite structure consisting of an inner lining tube, a metal tube with expansion pieces, and an outer wrapping membrane. This composite construction provides enhanced axial support performance while maintaining bending compliance, resolving the contradiction between strength and structural complexity.
Solution Approach 2:
The metal tube is segmented into a main tube and a head tube with elastic expansion pieces arranged circumferentially. This segmentation allows different sections to perform specialized functions: the main tube provides axial support while the head tube with expansion pieces enables bending compliance and directional control.
2Ease of manufacture
If the sheath structure is simplified, then the manufacturing process is easier, but the control precision during bending adjustment is reduced
Solution Approach 1:
The sheath incorporates elastic expansion pieces that can dynamically adjust the bending characteristics of the head tube. These expansion pieces allow the sheath to transition between different stiffness states, enabling precise control during bending adjustment while maintaining a relatively simple manufacturing process.
3Reliability
If a multi-layer sheath structure is implemented, then the mechanical performance is improved, but the device complexity increases
Solution Approach 1:
The multi-layer sheath structure applies different material properties and structural characteristics to different sections and layers. The inner lining tube provides smooth passage, the metal tube with expansion pieces provides axial support and bending control, and the outer wrapping membrane provides protection. This local optimization of quality enhances overall mechanical performance while keeping each component relatively simple.
Data Source
AI summary
The present invention discloses a core assembly, a sheath assembly, a sheath, a sheath processing method and an interventional instrument delivery system and method. A core assembly for delivering an interventional instrument according to the present invention comprises a core tube, a locking member fixed at a distal end of the core tube for connecting the interventional instrument, and a bendable adjustable tube mounted around an outer periphery of the core tube, wherein the distal ends of the bendable adjustable tube and the core tube are fixedly connected to each other, and the proximal ends can slide relative to each other.