Externally-coupled transcutaneus energy transmission system for a totally implantable artificial heart

Koshi, E.; Yazaki, Tomonori; Nomura, Taishin; Shu, Eimei; Utsimoniva, T.; Niwa, Shohei; Anai, H.; Masuzawa, Toru; Taenaka, Yoshiyuki; Takano, Hisateru

doi:10.1109/iembs.1993.978901

Cited by 2 publications

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“…The electronics unit is composed of internal and external controller subunits, transcutaneous energy transfer and optical telemetry subunits, and internal and external battery subunits. A report of the present development status and a detailed description of the electronics unit have been published elsewhere (5)(6)(7).…”

Section: Description Of Ehtah Systemmentioning

confidence: 99%

In Vivo Evaluation of the National Cardiovascular Center Electrohydraulic Total Artificial Heart

et al. 1999

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We have been developing an electrohydraulic total artificial heart system. The system comprises an intrathoracic pumping unit composed of diaphragm type ellipsoidal blood pumps and an energy converter in addition to an electronics unit. The in vivo performance of the pumping unit was evaluated in a series of animal implantations with 3 calves weighing 62-85 kg. An interatrial shunt 4.5 mm in diameter was made in the atrial septum to compensate left-right imbalance. Two calves died early postoperatively, one of external controller power failure and the other of interatrial shunt stenosis due to thrombus formation. One calf, however, survived over 10 days under stable circulatory conditions. No abnormality was found in the oxygen metabolic condition or in major organ functions. The generation and dissipation of heat from the device was acceptable. This animal died of device malfunction caused by energy converter bearing breakdown. The device demonstrated a good anatomic fit without compromising the great vessels and adjacent tissues. It is concluded that the pumping unit has a sufficient in vivo basic performance although appropriate countermeasures are to be implemented against the detected problems concerning mechanical durability and interatrial shunt patency.

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Section: Description Of Ehtah Systemmentioning

confidence: 99%

In Vivo Evaluation of the National Cardiovascular Center Electrohydraulic Total Artificial Heart

et al. 1999

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Transcutaneous Energy Transmission for Artificial Heart

Suyama¹,

Koyano²

2015

Journal of the Japan Society of Applied Electromagnetics and Me

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Transcutaneous energy transmission is a noninvasive method for supplying power to an implantable artificial heart. However, it is necessary to continue energy transmission using a transcutaneous transformer during bathing because an implantable battery is not yet commercially available. In this study, we evaluated the electromagnetic safety, transmission efficiency, and temperature rise of two types of transformers (air-core-flat type and externally coupled type) immersed in various conductive liquids, with the assumption of bathing and sweating. It was found that, as the liquid conductivity increased, the transmission efficiency decreased; and as the transmission frequency increased, the efficiency decreased significantly. When the transformers were immersed in 0.9% NaCl solution with the assumption of bathing and sweating, the transmission efficiency of each transformer was higher than 94.4% for a transmission frequency of 400 kHz, and the temperature rise was less than 0.3°C. These findings indicate that our transcutaneous transformers can transmit energy to artificial hearts even when immersed in 0.9% NaCl solution.

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Externally-coupled transcutaneus energy transmission system for a totally implantable artificial heart

Cited by 2 publications

References 0 publications

In Vivo Evaluation of the National Cardiovascular Center Electrohydraulic Total Artificial Heart

In Vivo Evaluation of the National Cardiovascular Center Electrohydraulic Total Artificial Heart

Transcutaneous Energy Transmission for Artificial Heart

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