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Kato, Yoshihito,Tada, Yutaka,Urano, Kunihiko,Hattori, Masahiro,Nagatsu, Yuichiro,Koh, Song-Tae,Lee, Young-Sei 社団法人 化学工学会 2010 化學工學論文集 Vol.36 No.1
<P>Numerous studies on power consumption in mixing vessels have been reported, and several power correlations have been developed for non-baffled mixing vessels, for example, Nagata's correlations. However, baffled mixing vessels with different impeller geometries have different power numbers. In this paper, the effects of vessel bottom shape, number of blades, and impeller position on power number were measured for several impellers with geometries that had been assumed to have the same power in Nagata's concept. It was found that power numbers in baffled vessels varied greatly with impeller geometry, while Nagata's concept is valid for non-baffled vessels, regardless of impeller position.</P>
Dongkyung Seo,Yutaka Dannoura,Riku Ishii,Keisuke Tada,Katsumi Horiuchi 대한수부외과학회 2022 대한수부외과학회지 Vol.27 No.1
Distal bypass combined with a free flap is a frequent surgical option for ischemic ulcers of the lower extremities. Here, we describe a patient in whom there was a change in the direction of blood flow in a distal bypass graft. A 68-year-old male patient with an ischemic ulcer on his left heel was referred to our facility by a local dermatology clinic. Surgical revascularization was performed between the popliteal artery and the dorsalis pedis artery using an ipsilateral great saphenous vein as the graft vessel. The wound site did not heal postoperatively, so it was covered using a free latissimus dorsi muscle flap. At the same time, the thoracodorsal artery was anastomosed to the bypass graft in an end-to-side manner to serve as a nutrient vessel. Initially, blood flow into the thoracodorsal artery from the bypass graft was via the popliteal artery. However, after occlusion of the proximal anastomotic site of the bypass graft, blood flow into the thoracodorsal artery from the bypass graft was via the dorsalis pedis artery, which was the distal anastomotic site. The change in direction of blood flow might have been the result of an increase in blood flow in the collateral vessels in the ischemic lower leg, which eventually overwhelmed the blood flow in the bypass graft.
Free Flap Salvage in the Ischemic Foot: A Case Report
Dongkyung Seo,Yutaka Dannnoura,Riku Ishii,Keisuke Tada,Kunihiro Kawashima,Tetsunori Yoshida,Katsumi Horiuchi 대한성형외과학회 2022 Archives of Plastic Surgery Vol.49 No.5
We performed distal bypass and free flap transfer in a single-stage operation to repair an extensive soft tissue defect in an ischemic foot of an 84-year-old woman. The nutrient artery of the free flap was anastomosed to the bypass graft in an end-to-side manner. Subsequently, the bypass graft became occluded on several occasions. Although intravascular and surgical interventions were performed each time, the bypass graft eventually became completely occluded. However, despite late occlusion of the nutrient artery, the free flap has remained viable and the patient is ambulatory. The time required for a transplanted free flap to become completely viable without a nutrient artery is likely longer for an ischemic foot compared with a healthy foot. However, the exact period of time required is not known. A period of month was required in our patient. We report this case to help clarify the process by which a free flap becomes viable when applied to an ischemic foot.
Flow visualization and numerical analysis of a new mixing equipment with vibratory fins
Yoshihito Kato,이영세,Setsuro Hiraoka,Shogo Fukumoto,Yutaka Tada,Yuichiro Nagatsu,Ryushin Ohmasa,Sung Tae Koh 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
The mixing performance of a new type of mixing equipment which has several fin oscillators on a pair of shafts with a vibrating motor was investigated. This mixing equipment, which is mainly used for industrial plating processes, was usually operated at a vibrating frequency of about 40 Hz with the amplitude 1mm. The flow visualization in this equipment showed that the flow in the vessel at laminar flow region was vertically divided into two distinct symmetric regions. The numerical simulation of the flow and the mixing patterns agreed well with the visualization result at laminar flow region.