Control of Centrifugal Blood Pump Based on the Motor Current

Iijima, Tatsuhiko; Inamoto, Taro; Nogawa, M.; Takatani, Setsuo

doi:10.1111/j.1525-1594.1997.tb03717.x

Cited by 32 publications

(29 citation statements)

References 12 publications

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“…In controlling the pump rpm, as demonstrated in the previous study (9,10), bypass flow and motor current waveforms of the tripod pump showed a strong correlation under all conditions. Thus, a similar analysis as proposed previously can be applied to control the pump rpm to prevent the suction effect in the ventricle as well as to optimize the bypass flow level.…”

Section: Discussionsupporting

confidence: 67%

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Development of a Compact, Sealless, Tripod Supported, Magnetically Driven Centrifugal Blood Pump

2000

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In this study, a tripod supported sealless centrifugal blood pump was designed and fabricated for implantable application using a specially designed DC brushless motor. The tripod structure consists of 3 ceramic balls mounted at the bottom surface of the impeller moving in a polyethylene groove incorporated at the bottom pump casing. The follower magnet inside the impeller is coupled to the driver magnet of the motor outside the bottom pump casing, thus allowing the impeller to slide-rotate in the polyethylene groove as the motor turns. The pump driver has a weight of 230 g and a diameter of 60 mm. The acrylic pump housing has a weight of 220 g with the priming volume of 25 ml. At the pump rpm of 1,000 to 2,200, the generated head pressure ranged from 30 to 150 mm Hg with the maximum system efficiency being 12%. When the prototype pump was used in the pulsatile mock loop to assist the ventricle from its apex to the aorta, a strong correlation was obtained between the motor current and bypass flow waveforms. The waveform deformation index (WDI), defined as the ratio of the fundamental to the higher order harmonics of the motor current power spectral density, was computed to possibly detect the suction occurring inside the ventricle due to the prototype centrifugal pump. When the WDI was kept under the value of 0.20 by adjusting the motor rpm, it was successful in suppressing the suction due to the centrifugal pump in the ventricle. The prototype sealless, centrifugal pump together with the control method based on the motor current waveform analysis may offer an intermediate support of the failing left or right ventricle bridging to heart transplantation.

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Section: Discussionsupporting

confidence: 67%

“…Based on the theoretical study conducted earlier, it was revealed that the significant waveform deformation does exist when the WDI value was above 0.2 (9,10). Thus, the threshold level of 0.2 was used to determine the presence of waveform deformation based on the FFT analysis.…”

Section: Methodsmentioning

confidence: 99%

Development of a Compact, Sealless, Tripod Supported, Magnetically Driven Centrifugal Blood Pump

2000

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“…Recent attempts have been able to physiologically mimic the atrium, ventricle, and vascular components, through the controlled use of pneumatic or hydraulic drives for flow, along with air tight integrated chambers to produce vascular resistance and compliance [19]. Although mock circulation loops provide a suitable test platform to evaluate cardiac assist devices [20,21] and their controllers performance [22,23], it has difficulty to produce complex nonlinear CV functions and implies high cost and compound mechanisms [24]. By focusing our attention on DMVA, it has not been shown how the mechanical interaction of these systems directly affects the complete mock circulatory system.…”

Section: Mock Modelsmentioning

confidence: 99%

Introducing a hardware-in-the-loop simulation of the cardiovascular system

Alazmani

Keeling

Walker

et al. 2012

2012 4th IEEE RAS &Amp; EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob)

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Advances in direct mechanical ventricular actuation devices have been limited by the inability to test the whole device interaction in-vitro. In this study, we introduce a novel technique to produce a realistic, multimodality cardiovascular simulator to mimic the activity of a beating heart. To achieve the mechanical representation of the heart, each ventricle was defined by a real-time modifiable semicircular pattern of post-buckled spring steel strips with adjustable boundary attachments. The mechanical properties of these strips such as stiffness, length, width and boundary conditions approximated the local and global biomechanical properties of the native heart. This physical heart model interfaced with a mathematical model of the cardiovascular system based on hardware-in-the-loop simulation. In-vitro experiments were carried out in an attempt to investigate into the effect that the DMVA system has on PV loop, cardiac output, and overall hemodynamics under different physiological conditions. By employing this in-vitro setting, assist devices can be physically applied to the circulatory models and assessed before animal or clinical trials are conducted. This will significantly aid device behavioural understanding, development time and cost during device's prototyping.

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“…Many of the publications related to VAD control do not describe controllers in the classical sense, but rather present algorithms with which suction can be detected (5,(7)(8)(9)(10)(11)(12)(13)(14)(15). Many of the publications related to VAD control do not describe controllers in the classical sense, but rather present algorithms with which suction can be detected (5,(7)(8)(9)(10)(11)(12)(13)(14)(15).…”

mentioning

confidence: 99%

A Physiological Controller for Turbodynamic Ventricular Assist Devices Based on a Measurement of the Left Ventricular Volume

et al. 2013

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The current article presents a novel physiological control algorithm for ventricular assist devices (VADs), which is inspired by the preload recruitable stroke work. This controller adapts the hydraulic power output of the VAD to the end-diastolic volume of the left ventricle. We tested this controller on a hybrid mock circulation where the left ventricular volume (LVV) is known, i.e., the problem of measuring the LVV is not addressed in the current article. Experiments were conducted to compare the response of the controller with the physiological and with the pathological circulation, with and without VAD support. A sensitivity analysis was performed to analyze the influence of the controller parameters and the influence of the quality of the LVV signal on the performance of the control algorithm. The results show that the controller induces a response similar to the physiological circulation and effectively prevents over- and underpumping, i.e., ventricular suction and backflow from the aorta to the left ventricle, respectively. The same results are obtained in the case of a disturbed LVV signal. The results presented in the current article motivate the development of a robust, long-term stable sensor to measure the LVV.

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Control of Centrifugal Blood Pump Based on the Motor Current

Cited by 32 publications

References 12 publications

Development of a Compact, Sealless, Tripod Supported, Magnetically Driven Centrifugal Blood Pump

Development of a Compact, Sealless, Tripod Supported, Magnetically Driven Centrifugal Blood Pump

Introducing a hardware-in-the-loop simulation of the cardiovascular system

A Physiological Controller for Turbodynamic Ventricular Assist Devices Based on a Measurement of the Left Ventricular Volume

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