Segmented Guide Wire Core for Torque and Shaping
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Solution Overview
Problem
Guide wires used in percutaneous coronary interventions face challenges in achieving both excellent torque transmission performance and shaping properties, particularly when the distal portion is formed into a flat plate shape, which compromises rigidity and limits shapeability.
Innovation Solution
A guide wire design featuring a flexible first core wire with a plate-shaped portion and a separate flexible second core wire, where the second core wire is shorter and fixed to the first core wire, allowing for overlapping linear portions that enhance torque transmission and shaping capabilities, with specific dimensions and configurations to maintain coaxial alignment and facilitate shaping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distal portion of the core wire is formed into a flat plate shape to enhance shaping property, then the shaping capability is improved, but the rigidity of the distal portion is lowered and torque transmission performance deteriorates
Solution Approach 1:
The core wire is divided into multiple segments: a distal plate-shaped portion for shaping, a proximal linear portion for torque transmission, and an intermediate connection portion that transitions between these functions. This segmentation allows each portion to be optimized for its specific function without compromising the others.
Solution Approach 2:
Different portions of the core wire have different cross-sectional shapes and mechanical properties tailored to their specific functions. The distal portion has a plate shape for shaping capability, while the proximal portion has a linear shape for torque transmission, creating local quality variations along the wire length.
2Ease of operation
If the core wire is made more flexible to improve navigation through complex blood vessels, then flexibility is improved, but torque transmission performance from the operator's hand to the distal portion deteriorates
Solution Approach 1:
The core wire is segmented into a distal flexible plate-shaped portion for navigation and a proximal rigid linear portion for torque transmission. This segmentation allows the distal end to be flexible for navigating complex vasculature while the proximal end maintains rigidity for effective torque transmission from the operator's hand.
Solution Approach 2:
The core wire exhibits local quality variations where the distal portion has higher flexibility for navigation while the proximal portion has higher rigidity for torque transmission. This gradient in mechanical properties resolves the contradiction between flexibility and torque transmission.
Data Source
AI summary
A guide wire including a flexible first core wire which has a first plate-shaped portion having a plate shape and a first linear portion having a linear shape that is continuous to the first-plate shaped portion. The width of the first plate-shaped is larger than the width of the first linear portion. The guide wire includes a flexible second core wire which has a second plate-shaped portion having a plate shape and a second linear portion having a linear shape that is continuous to the second-plate shaped portion. The width of the second plate-shaped portion is larger than the width of the second linear portion. The second plate-shaped portion axially overlaps the first linear portion, and the second linear portion axially overlaps the first plate-shaped portion.