Guide Wire Distal Tip Geometry for CTO Penetration and Vessel Safety
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Solution Overview
Problem
Existing guide wires face a challenge in achieving an appropriate balance between high penetration performance for hard lesions like CTO and minimizing the risk of damaging blood vessels, with no existing configurations effectively addressing this need.
Innovation Solution
A guide wire design featuring a distal end side joint part with a truncated cone-shaped outer diameter decreasing portion and a spherical segment-shaped most distal end portion, where the ratios of their dimensions satisfy specific equations (0.33<r1/r2<0.63 and 2.5<r3/r2<3.8), ensuring a balanced penetration capability without vessel damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide wire is designed with high penetration performance (e.g., tapered distal end joint part), then it can reliably penetrate hard lesions, but it increases the risk of accidentally damaging blood vessels
Solution Approach 1:
The distal end side joint part is designed with a specific geometric configuration consisting of a truncated cone-shaped outer diameter decreasing portion and a spherical segment-shaped most distal end portion. This localized structural design creates an optimal balance between penetration capability and vessel safety by concentrating the functional properties at the distal end while maintaining a different structure in the proximal portions
Solution Approach 2:
The patent specifies precise parameter ranges for the distal end side joint part: the outer diameter decreasing portion has a height r3 and the most distal end portion has a height r1 and bottom surface outer diameter r2, satisfying 0.33 < r1/r2 < 0.63 and 2.5 < r3/r2 < 3.8. These parameter optimizations ensure the guide wire achieves appropriate penetration performance without excessive vessel damage risk
Data Source
AI summary
A guide wire includes a core shaft, a coil body that covers the core shaft, and a distal end side joint part that joins the distal end of the coil body and the distal end of the core shaft. The distal end side joint part has a substantially truncated cone-shaped outer diameter decreasing portion whose outer diameter decreases toward the distal end direction, and a substantially spherical segment-shaped most distal end portion at the distal end of the outer diameter decreasing portion and whose outer diameter decreases towards the distal end direction. Height r1 of the most distal end portion, outer diameter r2 of the bottom surface of the most distal end portion, and height r3 of the outer diameter decreasing portion satisfy the following equations (1) and (2).0.33<r1/r2<0.63 (1)2.5<r3/r2<3.8 (2)