Flow Characteristics of the Hemopump: An Experimental In Vitro Study

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Presentation transcript:

Flow Characteristics of the Hemopump: An Experimental In Vitro Study Urban Lönn, MD, John Wulff, MD, Karl-Yngve Keck, MSEE, Bengt Wranne, MD, PhD, Per Ask, MSEE, PhD, Bengt Peterzén, MD, Henrik Casimir-Ahn, MD, PhD The Annals of Thoracic Surgery Volume 63, Issue 1, Pages 162-166 (January 1997) DOI: 10.1016/S0003-4975(96)00746-1

Fig. 1 Three different Hemopump catheters. Top: HP-21, middle: HP-31, bottom: HP-14. The Annals of Thoracic Surgery 1997 63, 162-166DOI: (10.1016/S0003-4975(96)00746-1)

Fig. 2 The Hemopump HP-21 femoral catheter in position within the heart, and its function. (Courtesy of Medtronic Inc, Hemodynamics Division, Grand Rapids, MI.) The Annals of Thoracic Surgery 1997 63, 162-166DOI: (10.1016/S0003-4975(96)00746-1)

Fig. 3 The Hemopump device with drive unit, with the HP-31 connected, and with the electromagnetic motor. A slow, continuous infusion of glucose is used for cooling and lubricating the pump. (Reprinted by permission of The Society of Thoracic Surgeons [Ann Thorac Surg 1995;59:S36–45].) The Annals of Thoracic Surgery 1997 63, 162-166DOI: (10.1016/S0003-4975(96)00746-1)

Fig. 4 Experimental model. Liquid is pumped by the Hemopump (HP) through a tube from container A up to container B. A seal between the HP cannulas and the tube prevents back-flow besides the HP. The height between the two containers can be adjusted to create different pressures toward the HP outlet. Stopping the pump will create back-flow through the HP cannulas from container B down to container A. The Annals of Thoracic Surgery 1997 63, 162-166DOI: (10.1016/S0003-4975(96)00746-1)

Fig. 5 Flow profiles of the different Hemopumps (HP) at the various speeds and pressure settings. (Inter. = intermediate; P = pressure.) The Annals of Thoracic Surgery 1997 63, 162-166DOI: (10.1016/S0003-4975(96)00746-1)

Fig. 6 Back-flow through the Hemopumps (HP) with the pump in the “off” mode at three different pressure levels. The Annals of Thoracic Surgery 1997 63, 162-166DOI: (10.1016/S0003-4975(96)00746-1)