{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,4,18]],"date-time":"2025-04-18T00:44:41Z","timestamp":1744937081571},"reference-count":15,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2007,11,12]],"date-time":"2007-11-12T00:00:00Z","timestamp":1194825600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Liver International"],"published-print":{"date-parts":[[2008,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:bold>Objective: <\/jats:bold> The stepwise hook extension technique for an expandable needle, which we reported previously, allowed roll\u2010off in short time with low power. The aim of this study was to investigate experimentally the efficacy of a modified extension procedure.<\/jats:p><jats:p><jats:bold>Methods: <\/jats:bold> Three pigs underwent 10 radiofrequency ablation (RFA) procedures using the 10\u2010hook 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).<\/jats:p><jats:p><jats:bold>Results: <\/jats:bold> The shape of the RFA\u2010induced zone was cone\u2010like or irregular in group 1 and oval\u2010like in group 2. The diameter vertical to the shaft was larger in group 2 (37, range 33\u201342\u2003mm) than in group 1 (23, range 20\u201329\u2003mm). The median ablation time was longer in group 2 (10\u2003min 13\u2003s) than in group 1 (3\u2003min 56\u2003s). 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\u2003kJ\/mm<jats:sup>3<\/jats:sup>).<\/jats:p><jats:p><jats:bold>Conclusions: <\/jats:bold> 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\u2003cm in diameter.<\/jats:p>","DOI":"10.1111\/j.1478-3231.2007.01619.x","type":"journal-article","created":{"date-parts":[[2010,8,27]],"date-time":"2010-08-27T13:15:33Z","timestamp":1282914933000},"page":"214-219","source":"Crossref","is-referenced-by-count":7,"title":["New ablation procedure for a radiofrequency liver tissue coagulation system using an expandable needle"],"prefix":"10.1111","volume":"28","author":[{"given":"Miharu","family":"Hirakawa","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenji","family":"Ikeda","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yusuke","family":"Kawamura","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masahiro","family":"Kobayashi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tetsuya","family":"Hosaka","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiromi","family":"Yatsuji","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hitomi","family":"Sezaki","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Norio","family":"Akuta","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fumitaka","family":"Suzuki","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshiyuki","family":"Suzuki","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Satoshi","family":"Saitoh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yasuji","family":"Arase","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiromitsu","family":"Kumada","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2007,11,12]]},"reference":[{"key":"e_1_2_5_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/hep.20933"},{"key":"e_1_2_5_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.hepres.2005.09.002"},{"key":"e_1_2_5_4_2","doi-asserted-by":"publisher","DOI":"10.1148\/radiology.202.1.8988212"},{"key":"e_1_2_5_5_2","first-page":"193","article-title":"Large hepatic ablation with bipolar saline\u2010enhanced radiofrequency","volume":"110","author":"Burdio F","year":"2003","journal-title":"an experimental study in vivo porcine liver with a novel approach"},{"key":"e_1_2_5_6_2","first-page":"841","article-title":"Combined use of percutaneous ethanol injection and radiofrequency ablation for the effective treatment of hepatocellular carcinoma","volume":"21","author":"Kurokohchi K","year":"2002","journal-title":"Intern J Oncol"},{"key":"e_1_2_5_7_2","first-page":"279","article-title":"Enlargement of thermal ablation zone by the combination of ethanol injection and radiofrequency ablation in excised bovine liver","volume":"24","author":"Watanabe S","year":"2004","journal-title":"Intern J Oncol"},{"key":"e_1_2_5_8_2","first-page":"1737","article-title":"Efficacy of combination therapies of percutaneous on laparoscopic ethanol\u2013lipiodol injection and radiofrequency ablation","volume":"25","author":"Kurokohchi K","year":"2004","journal-title":"Intern J Oncol"},{"key":"e_1_2_5_9_2","first-page":"164","article-title":"Radiofrequency ablation in a pig liver model","volume":"24","author":"Sugimori K","year":"2002","journal-title":"effect of transcatheter arterial embolization on coagulation diameter and histological characteristics"},{"key":"e_1_2_5_10_2","doi-asserted-by":"publisher","DOI":"10.1002\/1097-0142(20010401)91:7<1342::AID-CNCR1137>3.0.CO;2-0"},{"key":"e_1_2_5_11_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1478-3231.2006.01434.x"},{"key":"e_1_2_5_12_2","first-page":"789","article-title":"Effect of vascular occlusion on radiofrequency ablation of the liver","volume":"176","author":"Chinn SB","year":"2001","journal-title":"results in a porcine model"},{"key":"e_1_2_5_13_2","doi-asserted-by":"publisher","DOI":"10.1159\/000063808"},{"key":"e_1_2_5_14_2","doi-asserted-by":"publisher","DOI":"10.1186\/1476-5926-5-10"},{"key":"e_1_2_5_15_2","first-page":"542","article-title":"A multi\u2010step, incremental expansion method for radio frequency ablation","volume":"25","author":"Kotoh K","year":"2005","journal-title":"optimization of the procedure to prevent increases in intra-tumor pressure and to reduce the ablation time"},{"key":"e_1_2_5_16_2","doi-asserted-by":"publisher","DOI":"10.3748\/wjg.v11.i43.6828"}],"container-title":["Liver 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