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Development of an Active Micro Catheter using a Polymer Actuator
Takeshi Yokota,Kosaku Maeda,Kunitomo Kikuchi,Shigeki Tsuchitani 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Basic technologies to realize an active micro catheter using polypyrrole (PPy) as an actuator are being developed. The catheter is composed of a resin tube, a thin metal film for polymerization of PPy, and a PPy deposited on the electrode. From a finite element analysis, it was proved that a silicone tube with a diameter of 0.5mm and athickness of 0.05mm is the best for our specification. Copper film for electropolymerizing PPy, was deposited by RF sputtering on the silicone tube. The copper film was patterned by a laser machining. PPy was polymerized on the copper film, which was deposited on the half side of the silicone tube. When a voltage of 1.5V was applied to the PPy vs. a titanium electrode in a NaCl solution, the tube bent with a radius of curvature of 12cm.
Hideyuki Tamai,Naoki Shingaki,Yoshiyuki Mori,Kosaku Moribata,Akira Kawashima,Yoshimasa Maeda,Toru Niwa,Hisanobu Deguchi,Izumi Inoue,Takao Maekita,Mikitaka Iguchi,Jun Kato,Masao Ichinose 거트앤리버 소화기연관학회협의회 2016 Gut and Liver Vol.10 No.4
Background/Aims: This study aimed to predict sustained viral response (SVR) to low-dose pegylated interferon (PEGIFN) plus ribavirin of elderly and/or cirrhotic patients with genotype 2 hepatitis C virus (HCV) using viral response within 2 weeks. Methods: Low-dose PEG-IFN-α-2b plus ribavirin was administered to 50 elderly and/or cirrhotic patients with genotype 2 HCV for 24 weeks. The dynamics of HCV RNA and HCV core antigen levels within 2 weeks were measured. Results: The patients’ median age was 66 years. There were 21 male and 29 female patients. The median baseline HCV RNA level was 5.7 log IU/mL. Rapid viral response was achieved in 17 patients (34%), SVR in 28 (56%), and two (4%) discontinued treatment. Univariate analysis of factors contributing to SVR showed significant differences for sex, baseline virus level, and response within 4 weeks. When 40 fmol/L was set as the cutoff value for the core antigen level at 1 week, the sensitivity, specificity, positive predictive value, negative predictive value, and accuracy for predicting SVR were 93%, 75%, 84%, 88%, and 85%, respectively. Conclusions: Low-dose PEG-IFN plus ribavirin was a safe and costeffective treatment for elderly and/or cirrhotic patients with genotype 2 HCV, and the viral response within 2 weeks was a useful predictor of SVR.
( Tamiko Saito ),( Masafumi Naito ),( Yuki Matsumura ),( Hisaaki Kita ),( Tomoyo Kanno ),( Yuki Nakada ),( Mina Hamano ),( Miho Chiba ),( Kosaku Maeda ),( Tomoki Michida ),( Toshifumi Ito ) The Editorial Office of Gut and Liver 2014 Gut and Liver Vol.8 No.5
A 75-year-old Japanese man with chronic hepatitis C was found to have a large liver tumor and multiple nodules in the bilateral lungs. We diagnosed the tumor as hepatocellular carcinoma (HCC) with multiple lung metastases based on imaging studies and high titers of HCC tumor markers. Remarkably, without any anticancer treatment or medication, including herbal preparations, the liver tumor decreased in size, and the tumor makers diminished. Moreover, after 1 year, the multiple nodules in the bilateral lungs had disappeared. Fifteen months after the first medical examination, transcatheter arterial chemoembolization (TACE) was performed for the residual HCC. Because local relapse was observed on follow-up computed tomography, a second TACE was performed 13 months after the first one. At 4 years after the second TACE (7 years after the initial medical examination), there was no recurrence of primary or metastatic lesions. Spontaneous regression of HCC is very rare, and its mechanism remains unclear. Understanding the underlying mechanism of this rare phenomenon may offer some hope of finding new therapies, even in advanced metastatic cases. (Gut Liver 2014;8:569-574)