Development of a Transventricular Assist Device (TVAD) – Influence of the Volute Vanes

Andrade, Gustavo Caravita de; Andrade, Aron; Fonseca, Jeison; Silva, Bruno U da; Drigo, Evandro; Cardoso, José Roberto; Horikawa, Oswaldo

doi:10.1016/j.ifacol.2018.11.650

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…Results are not shown here, but the CFD analysis indicated that, the presence of vanes in the volute, assures that the majority of the flow is directed toward the rotor, providing better characteristics, in terms of pressure and flow rate, to the TVAD. Besides, without vanes, large amount of fluid recirculates inside the pump volume 17 . Slow, stagnant, or recirculating flow and low shear stresses promote thrombosis 18 .…”

Section: Methods and Resultsmentioning

confidence: 99%

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Impeller geometry definition of the transventricular assist device

et al. 2020

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According to the World Health Organization, cardiovascular diseases (CVDs) are the number one cause of death worldwide, except in Africa. 1 It is estimated that 17.5 million people died of CVDs in 2012, which is 31% of all global deaths. 2,3 In this scenario, the ventricular assist device (VAD) remains as the unique alternative to extend the patient life until the heart transplantation and is also a viable treatment for end-stage heart failure. 4 VADs can be pulsatile or nonpulsatile with centrifugal or axial flow. The axial blood pump can also be classified according to the surgical procedure to implant it: transcatheter (TC), open heart surgery (OHS), and minimally invasive surgery (MIS). In the TC, the axial flow pump assembly is inserted through the femoral artery and positioned, for example, in the ascending aorta, in order to accelerate blood and increase blood flow. In the open-heart surgery (OHS), the surgeon makes a large incision in the chest, opens the rib cage and operates the heart. Then, the blood pump is directly implanted on the ventricle or connected to the ventricle through a cannula. MIS is an alternative to the OHS. Here, a surgeon may perform the procedure by using laparoscopes through very small incisions. Table 1 shows some well-known models of axial VADs currently in use or in development, together with some parameters. Recently, HeartWare announced the development of the Longhorn, a new axial flow VAD that now is in the preclinical testing stage. The device requires minimal surgical access for transmyocardial implantation and no anastomosis

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Section: Methods and Resultsmentioning

confidence: 99%

“…Besides, without vanes, large amount of fluid recirculates inside the pump volume. 17 Slow, stagnant, or recirculating flow and low shear stresses promote thrombosis. 18 Additional work is necessary to indicate the optimum geometry of the vanes.…”

Section: Fluid Dynamics Analysismentioning

confidence: 99%

Impeller geometry definition of the transventricular assist device

et al. 2020

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“…However, the means to make best use of these measurements is lacking. The following recommendations might therefore be made from a control systems perspective, defining questions or needs the field can contribute to answering: devices [88,[165][166][167][168] or prosthetic heart valves [169,170] in an automated care framework.…”

Section: Recommendationsmentioning

confidence: 99%

Model-based management of cardiovascular failure: Where medicine and control systems converge

Desaive

Horikawa

Ortiz

et al. 2019

Annual Reviews in Control

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Cardiovascular disease is growing epidemically worldwide, multiplying the impact of increasingly aging populations on intensive care unit (ICU) demand. It is the leading cause of ICU admission, length of stay, mortality and, as a result, cost. Hence, there is a significant need to bring the gains in productivity enabled by automation and control systems technologies, which have arisen in so many sectors, to medicine and this field in particular. This review presents the background to the problem and the main issues arising in care from a control systems technology perspective. It then presents a vision of a more automated future with specific goals in the areas of dynamic systems modeling, system identification and control. These areas are reviewed, followed by specific recommendations for the field, where control systems expertise can be leveraged to best advantage.

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Design of a Hydrodynamic Performance Bench for Ventricular Assist Devices

Santos

Leão

Drigo

et al. 2022

TASJ

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This work presents the design of a hydrodynamic performance bench (HPB) of Ventricular Assist Devices (VADs) for evaluations of developed prototypes. VADs are used for the treatment of patients with Congestive Heart Failure (CHF), either as a bridge to recovery, for transplantation or as destination therapy. HPB is required for the performance evaluation of VADs that are under development in Brazil. The performance evaluation of a VAD considers the rotation speed [rpm], flow rate [L/min], pressure [mmHg] and power [W]. The project consists in choosing an actuator and transducers from HPB, and developing the mechanical components, supervisory control and modules. The HPB mechanical components were designed in SolidWorks® following rapid prototyping and built by additive manufacturing. The HPB supervisory program was developed in graphic language through the Labview® program and implemented in a development and application platform with data acquisition system. The manipulated variable of the supervisory system is the motor speed [rpm] acting via an Escon 50/4 EC-S power controller on the BLDC EC45 N339281 motor. The controlled variable is the “VAD flow” [L/min] provided by an HT-110 flow transducer. A particle image velocimetry (PIV) module was developed for flow analysis. All process data are stored in spreadsheets for later consultation. HPB could assist in a satisfactory way in the analysis of the developed VADs prototypes, demonstrating the technical success of the project.

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Development of a Transventricular Assist Device (TVAD) – Influence of the Volute Vanes

Cited by 3 publications

References 5 publications

Impeller geometry definition of the transventricular assist device

Impeller geometry definition of the transventricular assist device

Model-based management of cardiovascular failure: Where medicine and control systems converge

Design of a Hydrodynamic Performance Bench for Ventricular Assist Devices

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