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Return Vane Installed in Multistage Centrifugal Pump
Miyano, Masafumi,Kanemoto, Toshiaki,Kawashima, Daisuke,Wada, Akihiro,Hara, Takashi,Sakoda, Kazuyuki Korean Society for Fluid machinery 2008 International journal of fluid machinery and syste Vol.1 No.1
To optimize the stationary components in the multistage centrifugal pump, the effects of the return vane profile on the performances of the multistage centrifugal pump were investigated experimentally, taking account of the inlet flow conditions for the next stage impeller. The return vane, whose trailing edge is set at the outer wall position of the annular channel downstream of the vane and which discharges the swirl-less flow, gives better pump performances. By equipping such return vane with the swirl stop set from the trailing edge to the main shaft position, the unstable head characteristics can be also suppressed successfully at the lower discharge. Taking the pump performances and the flow conditions into account, the impeller blade was modified so as to get the shock-free condition where the incidence angle is zero at the inlet.
Hiroki Fukuya,Yoichiro Iboshi,Masafumi Wada,Yorinobu Sumida,Naohiko Harada,Makoto Nakamuta,Hiroyuki Fujii,Eikichi Ihara 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.6
We report a rare case of gastric cancer presenting with a gastrocolic fistula during ramucirumab and paclitaxel combination therapythat was successfully managed with colonic stenting. A 75-year-old man was admitted to our hospital with the chief complaint of mele-na. Esophagogastroduodenoscopy revealed a large ulcerated tumor in the lower stomach, judged by laparoscopy as unresectable (sT4b-N1M0). After four cycles of first-line chemotherapy with S-1 plus oxaliplatin, the patient showed disease progression, and second-linetherapy with ramucirumab and paclitaxel was started. At the end of the third cycle, the patient had gastric antral stenosis, which neces-sitated the placement of a gastroduodenal stent. When the patient complained of diarrhea 10 days later, esophagogastroduodenoscopyrevealed a fistula between the greater curvature of the stomach and the transverse colon. The fistula was covered by double colonicstenting, with a covered metal stent placed within an uncovered metal stent, after which leakage from the stomach to the colon stopped.
Onigiri Esophagography as a Screening Test for Esophageal Motility Disorders
( Shohei Hamada ),( Eikichi Ihara ),( Kazumasa Muta ),( Masafumi Wada ),( Yoshitaka Hata ),( Hiroko Ikeda ),( Yoshimasa Tanaka ),( Haruei Ogino ),( Takatoshi Chinen ),( Yoshihiro Ogawa ) 대한소화기기능성질환·운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.1
Background/Aims No screening test for esophageal motility disorder (EMD) has been established, the objective of this study is to examine the potential usefulness of our newly developed “Onigiri esophagography” combined with an obstruction level (OL) classification system in screening for EMD. Methods A total of 102 patients with suspected EMDs who underwent both high-resolution manometry (HRM) and Onigiri esophagography between April 2017 and January 2019 were examined. The EMD diagnosis was performed based on the Chicago classification version 3.0 by HRM. Onigiri esophagography was performed using a liquid medium (barium sulfate) followed by a solid medium, which consisted of an Onigiri (a Japanese rice ball) with barium powder. The extent of medium obstruction was assessed by the OL classification, which was defined in a stepwise fashion from OL0 (no obstruction) to OL4 (severe obstruction). Results The patients with OL0 (32.3%), OL1 (50.0%), OL2 (88.0%), OL3 (100.0%), and OL4 (100.0%) were diagnosed EMDs by HRM. The area under the curve, as determined by a receiver operating characteristic analysis, for the OL classification was 0.86. Using the cutoff value of OL1, the sensitivity and specificity were 87.3% and 61.3%, respectively, while using a cutoff value of OL2, the sensitivity and specificity were 73.2% and 90.3%, respectively. Conclusion In conclusion, Onigiri esophagography combined with the OL classification system can be used as a screening test for EMDs with a cutoff value of OL1. (J Neurogastroenterol Motil 2022;28:43-52)