Detection of Suction and Regurgitation of the Implantable Centrifugal Pump Based on the Motor Current Waveform Analysis and Its Application to Optimization of Pump Flow

1999 ◽  
Vol 23 (6) ◽  
pp. 532-537 ◽  
Author(s):  
Yuhki ◽  
Hatoh ◽  
Nogawa ◽  
Miura ◽  
Shimazaki ◽  
...  
Keyword(s):  
Centrifugal Pump ◽  
Waveform Analysis ◽  
Current Waveform ◽  
Motor Current ◽  
Pump Flow

A New Automatic Cardiac Output Control Algorithm for Moving Actuator Total Artificial Heart by Motor Current Waveform Analysis

1996 ◽  
Vol 19 (3) ◽  
pp. 189-196 ◽  
Author(s):  
W.W. Choi ◽  
H.C. Kim ◽  
B.G. Min
Keyword(s):  
Cardiac Output ◽  
Artificial Heart ◽  
Control Algorithm ◽  
Total Artificial Heart ◽  
Waveform Analysis ◽  
Right Atrial ◽  
Current Waveform ◽  
Output Control ◽  
Mock Circulatory System ◽  
Motor Current

A new automatic cardiac output control algorithm for an implantable electromechanical total artificial heart (TAH) was developed based on the analysis of motor current waveform without using any transducer. The basic control requirements of an artificial heart can be described in terms of three features: preload sensitivity, afterload insensivity, and balanced ventricular output. In previous studies, transducers were used to acquire information on the hemodynamic states for automatic cardiac output control. However, such a control system has reliability problems with the sensors. We proposed a novel sensorless automatic cardiac output control algorithm (ACOCA) providing adequate cardiac output to the time-varying physiological demand without causing right atrial collapse, which is one of the critical problems in an active filling device. In vitro tests were performed on a mock circulatory system to assess the performance of the developed algorithm and the results show that the new algorithm satisfied the basic control requirements of the cardiac output response.

scholarly journals PREDICTION OF LVAD FAILURE THROUGH MOTOR CURRENT WAVEFORM ANALYSIS

ASAIO Journal ◽  
1997 ◽  
Vol 43 (2) ◽  
pp. 57 ◽  
Author(s):  
A F Choudhri ◽  
P C Michelman ◽  
J E Tsillik ◽  
M C Oz ◽  
H R Levin
Keyword(s):  
Waveform Analysis ◽  
Current Waveform ◽  
Motor Current

AUTOMATIC CONTROL OF THE IMPLANTABLE CENTRIFUGAL PUMP THROUGH ANALYSIS OF THE MOTOR CURRENT WAVEFORM

ASAIO Journal ◽  
1997 ◽  
Vol 43 (2) ◽  
pp. 63
Author(s):  
T. Iijima ◽  
T. Inamoto ◽  
M. Nogawa ◽  
M. Miura ◽  
Y. Shimazaki ◽  
...  
Keyword(s):  
Automatic Control ◽  
Centrifugal Pump ◽  
Current Waveform ◽  
Motor Current

Automatic Control of the Implantable Centrifugal Blood Pump Based on Analysis of the Motor Current Waveform

2001 ◽  
pp. 431-435
Author(s):  
K Ouchi ◽  
E Hatoh ◽  
A Yuhki ◽  
M Nakamura ◽  
T Sakamoto ◽  
...  
Keyword(s):  
Automatic Control ◽  
Blood Pump ◽  
Current Waveform ◽  
Centrifugal Blood Pump ◽  
Motor Current

scholarly journals In Vivo Testing of a Magnetically Suspended Centrifugal Pump Designed for Long-Term Use

1997 ◽  
Vol 20 (10) ◽  
pp. 562-569 ◽  
Author(s):  
T. Yamada ◽  
K. Nishimura ◽  
T. Akamatsu ◽  
T. Tsukiya ◽  
C.H. Park ◽  
...  
Keyword(s):  
Centrifugal Pump ◽  
Rotational Speed ◽  
Thrombus Formation ◽  
Current Mode ◽  
Left Ventricular ◽  
Centrifugal Pumps ◽  
Motor Current ◽  
Magnetically Suspended Centrifugal Pump

The life of currently-available centrifugal pumps is limited to no more than three days. As a magnetically suspended centrifugal pump (MSCP) contains no shaft or seal, it could be expected to have a longer life expectancy. The MSCP was evaluated in a chronic animal model using eight adult sheep. Left ventricular assist with the MSCP was instituted between the left atrium and the descending aorta. The flow rates ranged from 2.5 to 6.0 L/min. The duration of the experiments ranged from 14 to 60 days. No mechanical failure occurred. The plasma free hemoglobin levels remained within an acceptable range (3-19 mg/dL). No reduction in the counts of red blood cells or platelets was observed. Thrombus formation within the MSCP was recognized in one pump. The main reason for termination was thromboembolism derived from the circuits. Three types of regulation methods (constant rotational speed, constant motor current, and controlled motor current) were also investigated. Regulation by a constant motor current mode altered the pressure-flow (P-Q) characteristics, and thereby, a steadier pump flow was obtained compared with regulation in the constant rotational speed mode. Moreover, the controlled motor current mode can change the P-Q relationship. These results demonstrate that the MSCP is a promising device for long-term use.

scholarly journals Module’s overheating assessment with the use of supply current waveform analysis

2018 ◽  
Vol 51 (6) ◽  
pp. 306-311
Author(s):  
Damian Grzechca ◽  
Paweł Rybka ◽  
Sebastian Temich
Keyword(s):  
Waveform Analysis ◽  
Current Waveform ◽  
Supply Current

A Mahalanobis Distance Measurement Method to Analyze Current Waveform for Determining the Motor’s Quality Types

2017 ◽  
Vol 870 ◽  
pp. 317-322
Author(s):  
Yun Chi Yeh ◽  
Tsung Fu Chien ◽  
Cheng Yuan Chang ◽  
Tsui Shiun Chu
Keyword(s):  
Mahalanobis Distance ◽  
Classification Accuracy ◽  
Measurement Method ◽  
Signal Amplitude ◽  
Distance Measurement ◽  
Digital Converter ◽  
Current Waveform ◽  
Analog To Digital ◽  
Motor Current ◽  
Good Detection

This study proposes a Mahalanobis Distance Measurement (MDM) method to analyze current waveform for determining the motor’s quality types. The MDM method consists of three major stages: (i) the preprocessing stage which is for enlarging motor current waveforms’ amplitude and eliminating noises, and includes signal amplitude amplifier, filter circuit (eliminating noises), and analog-to-digital converter (ADC) parts, (ii) the qualitative features stage which is for qualitative feature selection on motor current waveforms, and (iii) the classification stage which is for determining motor quality types using the MDM method. It can recognize defective motors and their defective types in less than 0.5 second. In the experiment, the total classification accuracy (TCA) was approximately 99.03% in average. The proposed method has the advantages of good detection results, no complex mathematic computations, hi-speed, and hi-reliability.

scholarly journals Research on the induction motor current signature for centrifugal pump at cavitation condition

2015 ◽  
Vol 7 (11) ◽  
pp. 168781401561713 ◽  
Author(s):  
Yin Luo ◽  
Xiong Zhixiang ◽  
Hui Sun ◽  
Shouqi Yuan ◽  
Jianping Yuan
Keyword(s):  
Induction Motor ◽  
Centrifugal Pump ◽  
Motor Current ◽  
Current Signature
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