Premium
New ablation procedure for a radiofrequency liver tissue coagulation system using an expandable needle
Author(s) -
Hirakawa Miharu,
Ikeda Kenji,
Kawamura Yusuke,
Kobayashi Masahiro,
Hosaka Tetsuya,
Yatsuji Hiromi,
Sezaki Hitomi,
Akuta Norio,
Suzuki Fumitaka,
Suzuki Yoshiyuki,
Saitoh Satoshi,
Arase Yasuji,
Kumada Hiromitsu
Publication year - 2008
Publication title -
liver international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.873
H-Index - 110
eISSN - 1478-3231
pISSN - 1478-3223
DOI - 10.1111/j.1478-3231.2007.01619.x
Subject(s) - radiofrequency ablation , ablation , medicine , coagulative necrosis , volume (thermodynamics) , surgery , biomedical engineering , nuclear medicine , physics , quantum mechanics
Objective: The stepwise hook extension technique for an expandable needle, which we reported previously, allowed roll‐off in short time with low power. The aim of this study was to investigate experimentally the efficacy of a modified extension procedure. Methods: Three pigs underwent 10 radiofrequency ablation (RFA) procedures using the 10‐hook electrode of LeVeen needle. The conventional technique was used in five RFA (group 1; the electrode was deployed in four steps to full extension), while the new technique was used in the other five RFA (group 2; the electrode was closed after the same three steps as group 1 and then fully extended). Results: The shape of the RFA‐induced zone was cone‐like or irregular in group 1 and oval‐like in group 2. The diameter vertical to the shaft was larger in group 2 (37, range 33–42 mm) than in group 1 (23, range 20–29 mm). The median ablation time was longer in group 2 (10 min 13 s) than in group 1 (3 min 56 s). Although the required energy was higher in group 2 than in group 1, that per volume was comparable between the groups (median 0.9 vs. 1.4 kJ/mm 3 ). Conclusions: Our new procedure requires a longer session but produces larger necrosis of a uniform ellipsoid volume, making it potentially suitable for tumours more than 3 cm in diameter.