Results 211 to 220 of about 48,468 (266)

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.
Leonardo A. Baloa, Dehou Liu, J. Robert Boston, Marwan A. Simaan, James F. Antaki   +4 more
openaire   +1 more source

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. Robert Boston, Marwan A. Simaan, James F. Antaki, Yih-Choung Yu   +3 more
openaire   +1 more source

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

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

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

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

Implanted Heart Assist Device after Intracardiac Surgery

New England Journal of Medicine, 1974
IN recent years there has been a steady decline in mortality after open intracardiac operations. However, persistent low cardiac output remains one of the prime causes of death, particularly in patients with far advanced myocardial dysfunction at the time of operation.
R S, Litwak, R M, Koffsky, S B, Lukban, R A, Jurado, S K, Elster, F, Lajam, R W, Brancato   +6 more
openaire   +2 more sources

Multi-objective optimal control of a heart assist device

Proceedings of the 39th IEEE Conference on Decision and Control (Cat. No.00CH37187), 2002
Heart assist devices play an important role in the treatment of heart disease. One of the key issues with these devices is the control of pump speed to satisfy multiple clinical requirements such as providing adequate cardiac output at appropriate left atrial pressure and systolic arterial pressure.
Dehou Liu, J. Robert Boston, Marwan A. Simaan, James F. Antaki   +3 more
openaire   +1 more source

On-line pressure estimation for a left heart assist device

IEEE Transactions on Biomedical Engineering, 1990
Long term measurement of blood pressures is essential for control of circulatory systems with artificial hearts or circulatory assist devices. Efforts to obtain reliable continuous direct measurements of blood pressures, however, have not been successful.
Tadashi Kitamura, David R. Gross
openaire   +2 more sources

Platelet Activation Markers in Patients With Heart Assist Device

Artificial Organs, 2005
Abstract:  Clinical use of heart assist devices is often associated with thromboembolic complications. We hypothesized that platelets may be activated in patients receiving assist devices and examined expression of the platelet activation markers CD62, CD63, and thrombospondin using flow cytometry in eight patients with Novacor left ventricular assist ...
Oliver, Dewald, Christoph, Schmitz, Heinz, Diem, Peter, Goehring, Herbert Otto, Vetter, Wilhelm, Roell, Oliver, Goedje, Diethelm, Tschoepe, Bruno, Reichart   +8 more
openaire   +2 more sources