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The Hemopump was designed to allow for temporary support of a failing heart. It is a continuous flow pump, and does not need to be synced to the rhythm of the heart. It assists in temporary heart stimulation with conditions such as cardiogenic shock following acute myocardial infarction, heart failure from cardiopulmonary bypass, and more. The pump can continually monitor the left ventricle, which allows for perpetual observation of the hearts condition. This allows for any necessary changes to be made when needed. The pump operates at speeds between two hundred and ninety and four hundred and seventy revolutions per minute.〔E.E. Kunst; J.A. van Alste; T. Arts; H.B.K. Boom. ( November, 1994). Integrated Unit for Programmable Control of the 21F Hemopump and registration of Physiological Signs. ''Medical & Biological Engineering & Computing''.〕 The Hemopump Cardiac Assist System is an older design intra-arterial, axial-flow pump circulatory assist device concept that offers temporary left ventricular support to patients in refractory cardiogenic shock without requiring major surgery for insertion.〔Robert T. Baldwin, MD; Branislav Radovanevic, MD; J. Michael Duncan, MD; Richard K. Wampler, MD; O.H. Frazier, MD (1992). Management of Patients Supported on the Hemopump® Cardiac Assist System. ''Texas Heart Institute Journal'' 1992;19:81-6.〕 The Hemopump draws blood with the impeller from the left ventricle and then exchanges it through the aorta. It can run at a constant speed, or two variable speeds during the cardiac cycle. Volume of the stroke, the rotating speed, or the pressure can all be tuned. These different setting are used for different conditions of the heart. It is optimal to run at two different speeds through a cardiac cycle as opposed to a constant speed. Running the pump at maximum capacity can be dangerous as it has led to complete collapse of the left ventricle in animal trials.〔He, P. P., Bai, J. J., & Xia, D. D. (2005). Optimum control of the Hemopump as a left-ventricular assist device. ''Medical & Biological Engineering & Computing'', 43(1), 136-141.〕 When in use there was low risk involved with the use of the Hemopump. There were not been many complications in patients that had used the pump. Any complications resulting in morbidity were seen to be rare. The Hemopump was deemed safe for use in community hospitals and it was expected that the number of patients supported by this device would increase. More advanced technologies however did outdate this device making it obsolete.〔 ==Commercial== The Hemopump was not successful commercially, however it was a precursor to many technologies that were developed off of the same concepts that were much more successful commercially. Attempts to make a low speed effective pump or LVAD are constantly being researched.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hemopump」の詳細全文を読む スポンサード リンク
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