Sensor Guide Wire Core Wire Jacket Wall Integration
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Solution Overview
Problem
Existing sensor guide wires face challenges in providing sufficient space for sensor elements and accessories while maintaining flexibility and pushability, and are prone to bending damage due to limited outer diameter and core wire flexibility.
Innovation Solution
The sensor guide wire incorporates a core wire that forms part of the jacket wall, either through mating, recessing, or compressing, to increase internal space and reduce bending stress, with centring means ensuring proper placement and attachment of the sensor element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the outer diameter of the guide wire is enlarged to provide more space for sensor elements, then the space availability for sensor elements is improved, but the guide wire becomes difficult to introduce into small and tortuous vessels
Solution Approach 1:
The core wire is positioned inside the tubular jacket, and the electrical leads are positioned in the space between the inner lumen wall and the core wire. This nested arrangement allows the guide wire to maintain a compact outer diameter for easy introduction into vessels while providing sufficient internal space for sensor elements and electrical leads.
2Adaptability or versatility
If the core wire is made more flexible to improve sensor guide flexibility, then the flexibility is improved, but the pushability into vessels deteriorates
Solution Approach 1:
The guide wire is designed with different mechanical properties in different regions: the core wire provides flexibility in the distal region for vessel navigation, while the proximal region maintains pushability through its structural configuration. The tubular jacket also provides localized support to balance flexibility and pushability requirements.
3Adaptability or versatility
If the jacket outer diameter is limited to 0.35 mm to match vessel geometry, then the compatibility with vessels is improved, but the space for sensor elements and accessories deteriorates
Solution Approach 1:
The core wire is positioned inside the tubular jacket, and the electrical leads are positioned in the space between the inner lumen wall and the core wire. This nested arrangement allows the guide wire to maintain a compact outer diameter for easy introduction into vessels while providing sufficient internal space for sensor elements and electrical leads.
4Reliability
If the guide wire is designed to withstand mechanical stress in sharp vessel bends, then the reliability is improved, but the flexibility deteriorates
Solution Approach 1:
The guide wire employs a composite structure combining a core wire with a tubular jacket made of different materials having complementary properties. The core wire provides flexibility and stress resistance, while the jacket provides protection and structural integrity, allowing the guide wire to withstand mechanical stress in sharp vessel bends while maintaining flexibility.
Data Source
AI summary
Sensor guide wire for intravascular measurements of a physiological variable in a living body, comprising a core wire running along at least a part of the sensor guide wire and a sensor element arranged in a jacket in a sensor region of the sensor guide wire. The jacket is tubular and is provided with a jacket wall and a portion of the core wire that extends longitudinally along the sensor region forms part of the wall of the jacket, in order to provide more space in the jacket.