Titanium-Nickel Shape Memory Alloy Spring Actuator for Forward-Looking Active Catheter | Zendy

Takahiro Namazu | Zendy; Mamoru Komatsubara | Zendy; Hiroyuki Nagasawa | Zendy; Takahiro Miki | Zendy; Takafumi Tsurui | Zendy; Shozo Inoue | Zendy

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Titanium-Nickel Shape Memory Alloy Spring Actuator for Forward-Looking Active Catheter

Author(s) -

Takahiro Namazu,

Mamoru Komatsubara,

Hiroyuki Nagasawa,

Takahiro Miki,

Takafumi Tsurui,

Shozo Inoue

Publication year - 2011

Publication title -

journal of metallurgy

Language(s) - English

Resource type - Journals

eISSN - 1687-9473

pISSN - 1687-9465

DOI - 10.1155/2011/685429

Subject(s) - sma* , materials science , shape memory alloy , actuator , catheter , abrasive , nickel titanium , transducer , polishing , composite material , spring (device) , titanium , etching (microfabrication) , hydraulic cylinder , biomedical engineering , metallurgy , mechanical engineering , acoustics , surgery , electrical engineering , computer science , engineering , medicine , physics , algorithm , layer (electronics)

The fabrication and characterization of forward-looking active catheter actuated by titanium-nickel (Ti-Ni) shape memory alloy (SMA) springs are described. The catheter has been designed for wide-range observation of an affected area inside a blood vessel when the blood vessel is occluded. The developed active catheter consists of eight Ti-Ni SMA spring actuators for actuation of catheter tip, an ultrasonic transducer for forward-looking, a guide wire, a polyurethane tube for coating, and spiral wirings for realization of various flexure motions of catheter tip using Ti-Ni SMA actuators. The size of the catheter is 3.5 mm in diameter and 60 mm in length of the sum of transducer and actuator sections. Ti-Ni SMA springs were fabricated from a Ti-50.9at.%Ni sheet by electrochemical etching with a mixed solution of ethanol and lithium chloride. The catheter was assembled by hand under a stereomicroscope. The tip of the produced catheter was able to move in parallel toward at least eight directions by controlling an applied current to Ti-Ni SMA springs. We have confirmed that the active catheter was able to observe an object settled in the front

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