Effect of Stationary Guiding Vanes on Improvement of the Washout Behind the Rotor in Centrifugal Blood Pumps

Schima, Heinrich; Huber, Leopold; Melvin, David; Trubel, W.; Prodinger, A; Losert, Udo; Thoma, H.; Wolner, Ernst

doi:10.1097/00002480-199207000-00024

Cited by 31 publications

(18 citation statements)

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“…Blood damage in centrifugal pumps is primarily caused by shear stress, time, and turbulent flow (22)(23)(24)(25). Circuit clotting has also been sited as a cause for elevated freeHb (4).…”

Section: Discussionmentioning

confidence: 99%

Hemolytic characteristics of three commercially available centrifugal blood pumps

Lawson

Ing²,

Cheifetz³

et al. 2005

Pediatric Critical Care Medicine

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“…Blood damage in centrifugal pumps is primarily caused by shear stress, time, and turbulent flow (22)(23)(24)(25). Circuit clotting has also been sited as a cause for elevated freeHb (4).…”

Section: Discussionmentioning

confidence: 99%

Hemolytic characteristics of three commercially available centrifugal blood pumps

Lawson

Ing²,

Cheifetz³

et al. 2005

Pediatric Critical Care Medicine

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“…This axle was connected to the motor sealed by rubber. To reduce thrombus formation at the seal, secondary vanes were established at the back-plane of the housing to increase washout in this area (18).…”

Section: Methodsmentioning

confidence: 99%

The Vienna Implantable Centrifugal Blood Pump

Schima¹,

Trubel²,

Wieselthalerxy³

et al. 1994

Artificial Organs

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Because of the inherent disadvantages of membrane pumps, rotary pumps have been increasingly investigated in recent years. As a result of improving biocompatibility, extended assistance with implantable devices is of special interest. Questions arise concerning shear stress, blood traumatization, design of seals, and specific control conditions. In their development of an implantable impeller pump, the Vienna group studied the minimization of hemolysis and thrombus formation by means of numerical simulation, visualization, and in vitro blood evaluation. The latter was revealed to be the most powerful tool for pump evaluation. With optimization of geometry, a hemolysis of in vitro: IH = 0.008; MIH = 0.58; and in vivo: 2.1 to 3 mg% plasma-free hemoglobin could be obtained. For proper control and physiological adaptation, a controller based on a nonlinear and a fuzzy strategy was developed. Furthermore, a method for evaluation of the contractility of the assisted heart during nonpulsatile support was tested by computer simulation. This paper summarizes the evaluation methods used and provide an overview of the results of pump and controller design.

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“…Typical methods are the tracer injection method and the surface trace method. The streak line method (Schima et al 1992) and the suspension method (Araki et al 1993) are examples of the tracer injection method, and the oil dot method (Burgreen et al 2001) and the oil film method (Tsukiya et al 2002) are examples of the surface trace method. Qualitative flow visualization is sometimes conducted on the inner flow because overall goodness can be judged for the geometry design of blood pumps.…”

Section: Fluid Dynamics Analysis Of Blood Pumpmentioning

confidence: 99%

Vascular Engineering of Circulatory Assist Devices

Nishida

2016

Vascular Engineering

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Heart failure is a condition in which the heart cannot pump sufficiently because its contractile force has deteriorated. Patients with heart failure can sometimes undergo heart transplantation, but in number these patients comprise less than 10 % of patients actually requiring heart transplantation. Thus, mechanical circulatory assistance plays an important role in substituting for heart transplantation wherein the pump function of the heart is assisted by an artificial blood pump called a ventricular assist device. On the other hand, cardiopulmonary bypass is a form of extracorporeal circulation that temporarily takes over the function of the heart and lungs to maintain the circulation of blood and the oxygen content of the body during surgery for heart failure and aneurysms of the thoracic aorta. This chapter describes the vascular engineering of circulatory assist devices. Particular emphasis is placed on recent progress in ventricular assist devices and cardiopulmonary bypass pumps. These important medical devices assist with human circulation at either the chronic or the acute phase. Because these devices are derived from an industrial pump, a great many studies have been conducted not only from the medical perspective but also from industrial and engineering perspectives. In this chapter, current ventricular assist devices and cardiopulmonary bypass pumps, their specifications, their classifications, and methods for their design and evaluating are presented, including flow analysis inside the pump to optimize the geometry.

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Effect of Stationary Guiding Vanes on Improvement of the Washout Behind the Rotor in Centrifugal Blood Pumps

Cited by 31 publications

References 0 publications

Hemolytic characteristics of three commercially available centrifugal blood pumps

Hemolytic characteristics of three commercially available centrifugal blood pumps

The Vienna Implantable Centrifugal Blood Pump

Vascular Engineering of Circulatory Assist Devices

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