论文信息 - An Active Guide Wire With Shape Memory Alloy Bending Actuator Fabricated By Room Temperature Process

An Active Guide Wire With Shape Memory Alloy Bending Actuator Fabricated By Room Temperature Process

Abstract An active guide wire of 0.5 mm outer diameter has been developed. The guide wire has a simple and flexible structure that consists of a NiTi shape memory alloy (SMA) bending actuator with meandering shape and a bias coil that is covered with thin polyurethane tube. It can bend to one-direction by heating with electric current and is restored by the bias coil. Large current was necessary to bend the guide wire in water, however, it could bend over 60°. The rise of the surface temperature of the guide wire was less than 5 °C in water. The SMA bending actuator has been photo-fabricated from a flatten SMA sheet which was spread flat after it was memorized in curve-shape. In order to fabricate the actuator below the transition temperature of the SMA, a room temperature photo-fabrication process has been also developed.

[1] Masayoshi Esashi,et al. Thin-walled Tube Supported by Coil Spring for Small Diameter Active Catheters , 2000 .

[2] Kazuhisa Yanagisawa,et al. Multi-Freedom Tube Type Manipulator with SMA Plate , 1996 .

[3] Yoichi Haga,et al. Batch fabricated flat meandering shape memory alloy actuator for active catheter , 2001 .

[4] Takayuki Shibata,et al. Electrochemical Photoetching of Rolled Shape Memory Alloy Sheets for Microactuators , 1998 .

[5] Masayoshi Esashi,et al. Bending, torsional and extending active catheter assembled using electroplating , 2000, Proceedings IEEE Thirteenth Annual International Conference on Micro Electro Mechanical Systems (Cat. No.00CH36308).