Results 251 to 260 of about 319,815 (308)

Heart assist devices: Modeling and diagnostics

2nd Middle East Conference on Biomedical Engineering, 2014
In this paper, adaptive stead-state models are presented for axial flow-pumps used as heart assist devices. These models predict flow rate and power consumption of the pump based on the pressure differential (head) and impeller speed. The developed models are identified using system identification techniques on data obtained from a mock circulatory ...
Taoufik Wassar, Matthew A. Franchek, Karolos M. Grigoriadis, Cedric Benkowski, Mehmet C. Kadipasaoglu, Steven M. Parnis   +5 more
openaire   +1 more source

Control of rotary heart assist devices

Proceedings of the 2000 American Control Conference. ACC (IEEE Cat. No.00CH36334), 2000
Rotary assist devices are state of the art blood pumps that are used in therapies to treat weak hearts, usually associated with myocardial diseases. We develop three indices to detect the occurrence of suction in these pumps: pulsatility index, diminishing returns index and harmonic index.
L.A. Baloa, null Dehou Liu, J.R. Boston, M.A. Simaan, J.F. Antaki   +4 more
openaire   +1 more source

The Design of a Piezoelectric Heart Assist Device

IEEE Transactions on Biomedical Engineering, 1975
A piezoelectric heart assist device was designed, and preliminary tests were performed in vitro and in vivo. The device has the advantages of simple construction, low power consumption (approximately one watt), electrical rather than pneumatic drive, and noiseless operation.
M J, Williams, W, Welkowitz, S, Fich, D A, Molony, D, Jaron, A, Kantrowitz   +5 more
openaire   +2 more sources

Intelligent control design for heart assist devices

Proceedings of the 1998 IEEE International Symposium on Intelligent Control (ISIC) held jointly with IEEE International Symposium on Computational Intelligence in Robotics and Automation (CIRA) Intelligent Systems and Semiotics (ISAS) (Cat. No.98CH36262), 2002
Heart assist devices are blood pumps used to augment the cardiac output of patients with left ventricular failure. A new generation of devices being evaluated for human use is based on turbo-hydrodynamic methods of pumping, which offer several advantages over the reciprocating, pulsatile methods used in current devices.
J.R. Boston, M.A. Simaan, J.F. Antaki, null Yih-Choung Yu, null Seongjin Choi   +4 more
openaire   +1 more source

Heart Assist Devices: State of the Art

Critical Care Nursing Clinics of North America, 1991
The various types of available mechanical assist devices are discussed in this article. Nursing care (both intraoperatively and postoperatively) and complications are also reviewed.
openaire   +2 more sources

Control issues in rotary heart assist devices

Proceedings of the 2000 American Control Conference. ACC (IEEE Cat. No.00CH36334), 2000
Heart assist devices are mechanical pumps used in patients with cardiovascular diseases who are awaiting heart transplantation. With increasing clinical success, these devices are being used for longer periods of time, and automatic control has become an important requirement.
J.R. Boston, M.A. Simaan, J.F. Antaki, null Yih-Choung Yu   +3 more
openaire   +1 more source

Control of an extracorporeal heart assist device

2012 IEEE International Conference on Control Applications, 2012
Heart assist devices provide mechanical circulatory support for patients with end-stage heart failure. Extracorporeal blood pumps are applied to adult and pediatric patients in the case of uni- and biventricular assistance. Modern driving units provide more mobility what is an immense benefit to the quality of life of the patients.
Alexander Sievert, Constantin Wiesener, Andreas Arndt, Wolfgang Drewelow, Olaf Simanski   +4 more
openaire   +1 more source

Modeling and Diagnostics of Heart Assist Devices

ASME 2009 Dynamic Systems and Control Conference, Volume 2, 2009
Presented are online adaptive models for ventricular assist devices (VADs). Such devices are used to assist failing hearts or in the case considered here to create a total artificial heart. Adaptive models are developed to estimate cardiac output (CO) and power consumption of the VAD.
Taoufik Wassar, Hassene Jammoussi, Rafik Borji, Matthew A. Franchek, Ralph Metcalfe, Cedric Benkowski, Robert Benkowski, O. Howard Frazier, William E. Cohn, Egemen Tuzun, Steven M. Parnis   +10 more
openaire   +1 more source

Clinical Application of the Ellipsoid Left Heart Assist Device

Artificial Organs, 1978
ABSTRACTThe ellipsoid left heart assist device (E‐LVAD) was implanted in eight patients suffering from intra‐operative heart failure. It was not possible to remove these patients from extracorporeal circulation following an intracardiac procedure; therefore, implantation of the E‐LVAD was performed during extracorporeal circulation.
E, Wolner, M, Deutsch, U, Losert, F, Stellwag, H, Thoma, F, Unger, K, Polzer, J, Navratil   +7 more
openaire   +2 more sources

Early Clinical Experiences with a Heart Assist Device

1975
A method of left heart (left atrium-aorta) support after open heart surgery is described. Thoracic reentry is not required when support is terminated. The system has been employed in 10 patients, 4 of whom are long-term survivors.
R S, Litwak, R M, Koffsky, G, Silvay, S B, Lukban, R A, Jurado, A, Fischer   +5 more
openaire   +2 more sources