ゴウリュウブ ケッセキ Confluence Stone ノ 1チケンレイ

Confluence stone is a rare disease that is difficult to diagnose before surgery and thattend to accompany intraoperative biliary tract injury and postoperative stenosis, unexpectively.We have report a case of confluence stone.The patient was 67-year-old woman. During treatment for cholecystolithiasis at anotherhospital, she had upper abdominal pain three times without fever up and jaundice. Shewas reffered to our hospital for a detailed examination. Ultrasonography, CT and endoscopicretrograde cholangiopancreatography (ERCP) allowed a diagnosis of common bileduct stenosis caused by confluence stone. Laparotomy was then performed. No malignancywas shown despite of seveve cholecystitis. Thus cholecystectomy was carried out,then the biliary stenosis was repaired by patch graft method.It is known that confluence stone arise biliostasis with the progression of chroniccholecystitis. Therefore, in cases of severe chronic cholecystitis we should consider thepossibility of the confluence stone and take care of the biliary tract injury and postoperativestenosis

Improvement of a high current DC power supply system for testing the large scaled superconducting cables and magnets

A DC 75 kA power supply system was constructed to test the SC (superconducting) R&D (research and development) cables and magnets for the Large Helical Device (LHD). It consists of three 25 kA unit banks. A unit bank has two double-star-rectifier connections with the inter-phase reactors. A digital feedback control method is applied to the automatic current regulation (ACR) in each unit bank. For shortening the dead time of the feedback process, a new algorithm of a digital phase controller for the ACR is investigated. A Bode diagram of the feedback process is directly measured. It is confirmed that the dead time of the feedback process is reduced to one sixth, and that the feedback gain of PID (proportional, integral and differential) compensation is improved by a factor of two from the original metho