Dual-Core Coronary Guidewire Technical Dossier
1. Dual-Core Structural Design
(1) Layered Architecture
| Component | Material & Function |
|--------------------------|---------------------------------------------------------------------------------------------------------------|
| Inner Core Wire | Superelastic Nitinol (SE508), Ø0.005"-0.008", provides shape recovery and kink resistance |
|Outer Support Core | High-yield stainless steel (316LVM), Ø0.010"-0.012", enhances pushability and torque transmission |
| Taper Transition | Laser gradient welding (Tensile strength ≥80gf at transition zone) |
(2) Composite Coating System
- Proximal Segment: PTFE coating (2-5μm) for reduced catheter friction
- Distal Segment: Hydrophilic-hydrophobic hybrid coating (e.g., PVP+silicone) for optimized trackability
2. Performance Advantages (vs. Single-Core Design)
| Parameter | Dual-Core | Single-Core |
|--------------------------------|----------------------------------------------------|-----------------------------------|
| Push Efficiency | +40% improvement (≥92% transmission) | 65-75% typical |
| Kink Resistance | >500 cycles (1.5mm bend radius) | 200-300 cycles |
| Tip Responsiveness | <5° torque delay (1:1.05 ratio) | 10-15° delay |
3. Clinical Applications
(1) Complex Lesions
- CTOs: Outer core provides penetration force (up to 3g tip load), inner core prevents perforation
- Calcified Tortuous Vessels: Dual-core synergy minimizes whipping effect
(2) Procedural Compatibility
- Retrograde PCI: Maintains push stability through collateral channels
- OCT/IVUS Guidance: Radiopaque markers (Ta+Au plating) compatible with intravascular imaging
4. Critical Manufacturing Requirements
- Concentricity Control: ≤0.001" deviation (laser real-time monitoring)
- Heat Treatment: Stage-aged (Nitinol: 400°C/1h; SS: 300°C/2h)
- Coating Curing: UV+vacuum annealing (adhesion ≥1.5N/mm)
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