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Design, Manufacturing and Parametric Optimization of a Left Ventricular Assisted Device

Mohammadi, Javad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52750 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Zohoor, Hassan; Firoozbakhsh, Keikhosrow; Ahmadian, Mohammad Taghi
  7. Abstract:
  8. The heart is a vital part of the body whose primary function is to pump blood throughout the body. The world's leading cause of deaths is due to heart problems. Today, most countries invest heavily in solving these problems and preventing the resulting deaths. One solution for patients with advanced heart disease is to use ventricular assist devices. This device is Used in parallel to the patient's heart, completely or partially replaces the normal functioning of the heart and provides much of the blood needed by the body. The purpose of this study is to design, manufacture and parametrically optimize a ventricular assist pump and its driver system. Since blood is clotted in contact with mechanical components, the concept of magnetic levitation and non-contact stimulation was used in the design of the pump in which the impeller of the pump without connecting to the shaft, the bearing, Seals and other mechanical members are actuated and controlled. It should be noted that a prototype of this pump is made but in this project, pump defects such as Pump vane contact with the housing, low pump speed and ... are repaired and optimized parametrically. After the pump design was completed with the modified parameters in mind, the pump was manufactured using 3D printing method. The design of the driver system was also carried out taking into account the modified parameters and then manufactured by machining precision and then assembled. Tests were performed to evaluate the performance of the system. In the initial test using water as the fluid, the pump's characteristic curves were obtained, which included head, efficiency, power and net suction head in terms of flow rate. In the second test at the Tehran Heart Center Hospital, the test was performed by built-in system with human blood in according to the standard test of ventricular assist pumps and changes in blood components during the test was Checked out to determine the effect of modified parameters and successful results Obtained
  9. Keywords:
  10. Ventricular Assist Device ; Magnetic Levitation ; Magnetic Suspension System ; Centrifugal Heart Pump ; Three Dimentional Printing ; Noncontact Drive System

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