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AJNR - American Journal of Neuroradiology

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Distal-Tip Shape-Consistency Testing of Steam-Shaped Microcatheters Suitable for Cerebral Aneurysm Coil Placement

Toshi Abe^a, Masaru Hirohata^b, Norimitsu Tanaka^a, Yusuke Uchiyama^a, Kiminori Fujimoto^a, Naoko Fujimura^b, Alexander M. Norbash^c and Naofumi Hayabuchi^a

^a Department of Radiology, Kurume University School of Medicine, Fukuoka, Japan
^b Department of Neurosurgery, Kurume University School of Medicine, Fukuoka, Japan
^c Department of Neuroradiology and Endovascular Neurosurgery, Brigham and Women’s Hospital, Boston, MA

View larger version (55K): [in a new window]   FIG 1. Excel 14 catheter, demonstrating 7-mm length and manually steam-shaped 90° angle curve. Although the initial measured tip angle measured 98° (I), the tip angle decreased to 75° following coaxial microcatheter insertion through a guiding catheter (CI). The tip angle was further reduced to 46° following guidewire manipulation (GW). The tip angle recovered to approximately 60° after the second (C2) and fifth GDC withdrawals and insertions (C5). The change rate of the catheter-tip angles, once exposed to straightening forces, is graphically depicted as a percentage straightening when compared with the initial baseline-shaped angle.

View larger version (17K): [in a new window]   FIG 2. Change rate without stress on 5- and 7-mm lengths of steam-shaped catheter tip. After insertion through a guiding catheter (CI), measurement was performed at 5, 15, and 30 minutes. Exc14 indicates Excel 14; Fas10, FasTracker 10; I, initial measurement; Prow14, Prowler 14; ProwPS, Prowler 14 Preshaped; and SL10, Excelsior SL 10.

View larger version (21K): [in a new window]   FIG 3. Change rate with stress on 3-, 5-, and 7-mm lengths of steam-shaped catheter tip. CI indicates coaxial microcatheter insertion through a guiding catheter; C2, after second GDC insertions and withdrawals; C5, after fifth GDC insertions and withdrawals; Exc14, Excel 14; Fas10, FasTracker 10; GW, microguidewire manipulation; I, initial measurement; Prow14, Prowler 14; ProwPS, Prowler 14 Preshaped; and SL10, Excelsior SL 10.