Monitoring of Diaphragm Position in Pulsatile Pnumatic Ventricular Assisted Device by Ultrasound Sensor : A New Method for Flow Measurement in VAD(<Special Issue>Bioengineering)
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概要
- 論文の詳細を見る
A new method using ultrasound sensors to detect the diaphragm position of a ventricular assist device (VAD) was proposed. Two small ultrasound sensors of 2.4mm diameter were attached to the outside surface of blood chamber of a pneumatic VAD. The receiving crystal received the ultrasound from the transmitting crystal reflected by the diaphragm. The diaphragm position was calculated by using geometric relation among two sensors and ultrasound propagation time. Validity of this method was evaluated in a mock circulation test under various driving conditions of VAD by comparing the ultrasound signals with driving pressure waveforms. The ultrasound signals could detect full-fill (FF) and full-eject (FE) status shortly before the spikes appeared on pressure waves, which are currently available to detect FE and FF but accompanies excessive extension of the diaphragm. This method would be helpful to avoid overloading of diaphragm. Linear correlation was observed between the output from VAD and blood volume calculated from the change of diaphragm position multiplied by the heart rate. This monitoring method of diaphragm of a VAD was proven to have advantages over the current method toward better control of a pneumatic VAD.
- 社団法人日本機械学会の論文
- 2004-12-15
著者
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Lee Hwansung
Department Of Artificial Organs Research Institute National Cardiovascular Center
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TAENAKA YOSHIYUKI
National Cardiovascular Center; Department of Artificial Organs
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Kitamura Soichiro
National Cardiovascular Center
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Taenaka Yoshiyuki
Department Of Artificial Organs Research Institute National Cardiovascular Center
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Taenaka Yoshiyuki
国立循環器病センター研究所 人工臓器部
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KAMIMURA Tadayuki
National Cardiovascular Center
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HOMMA Akihiko
National Cardiovascular Center
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TSUKIYA Tomonori
National Cardiovascular Center
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KAKUTA Yukihide
National Cardiovascular Center
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LEE Hwansung
National Cardiovascular Center
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TATSUMI Eisuke
National Cardiovascular Center
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KAMIMURA Tadayuki
Department of Artificial Organs, Research Institute, National Cardiovascular Center
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Homma Akihiko
Department Of Artificial Organs Research Institute National Cardiovascular Center
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Tsukiya Tomonori
The Advanced Medical Engineering Center National Cardiovascular Center Research Institute
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Tatsumi Eisuke
Department Of Artificial Organs Research Institute National Cardiovascular Center
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Taenaka Y
Department Of Artificial Organs Research Institute National Cardiovascular Center
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Taenaka Yoshiyuki
National Cardiovascular Center Research Institute
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Kashiwabara Susumu
National Cardiovascular Center
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Kakuta Yukihide
The Advanced Medical Engineering Center National Cardiovascular Center Research Institute
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Kamimura Tadayuki
Department Of Artificial Organs Research Institute National Cardiovascular Center:japan Association
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TAENAKA Yosiyuki
Department of Artificial Organs, Research Institute, National Cerebral and Cardiovascular Center
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Tsukiya Tomonori
Department of Artificial Organs, Research Institute, National Cerebral and Cardiovascular Center
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