TY - JOUR
T1 - Bending mechanism using SMA wires for transurethral lithotripsy
AU - Tachioka, Toshiki
AU - Matsunaga, Tadao
AU - Tanahashi, Yoshikatsu
AU - Kobayashi, Takumi
AU - Haga, Yoichi
N1 - Publisher Copyright:
© 2018 The Institute of Electrical Engineers of Japan.
PY - 2018
Y1 - 2018
N2 - In the transurethral lithotripsy using flexible endoscope (f-TUL), a flexible ureteroscope is inserted into the bladder from the urethra and breaks calculus by laser transmitted through an optical fiber. Because laser irradiation position is fixed in the endoscopic field of view, it is difficult to perform precise alignment of laser to the target when the target has relatively complex structure. To solve the problem, a thin multidirectional active bending mechanism of the laser fiber using Shape Memory Alloy (SMA) wire has been developed. This device has 170 μm diameter channel for laser fiber and is controlled by 3 SMA wires. Maximum outer diameter is 1.1 mm and length of the bending part is 10 mm. The fabricated bending mechanism with laser fiber bends up to 10 degrees. Surface temperature was measured by using a thermocouple in water bath and was lower than 41°C.
AB - In the transurethral lithotripsy using flexible endoscope (f-TUL), a flexible ureteroscope is inserted into the bladder from the urethra and breaks calculus by laser transmitted through an optical fiber. Because laser irradiation position is fixed in the endoscopic field of view, it is difficult to perform precise alignment of laser to the target when the target has relatively complex structure. To solve the problem, a thin multidirectional active bending mechanism of the laser fiber using Shape Memory Alloy (SMA) wire has been developed. This device has 170 μm diameter channel for laser fiber and is controlled by 3 SMA wires. Maximum outer diameter is 1.1 mm and length of the bending part is 10 mm. The fabricated bending mechanism with laser fiber bends up to 10 degrees. Surface temperature was measured by using a thermocouple in water bath and was lower than 41°C.
KW - Bending mechanism
KW - Shape memory alloy
KW - Transurethral lithotripsy
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U2 - 10.1541/ieejsmas.138.41
DO - 10.1541/ieejsmas.138.41
M3 - Article
AN - SCOPUS:85041464518
VL - 138
SP - 41
EP - 47
JO - IEEJ Transactions on Sensors and Micromachines
JF - IEEJ Transactions on Sensors and Micromachines
SN - 1341-8939
IS - 2
ER -