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Design and Manufacturing of Left Ventricular Assist Device for Patients Undergoing Cardiac Surgery

Ahmadidoust, Ehsan | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50169 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Ahmadian, Mohammad Taghi; Firouzbakhsh, Keikhosrow
  7. Abstract:
  8. The heart is a powerful muscle whose primary function is to pump blood into the body. many cardiac patients reach a stage that can no longer be kept function of their heart to a satisfactory level by using medication thus doctors undergo surgery. The common problem occurs to most patients undergoing cardiac surgery is that after the surgery, the patient's heart during a short period of time is unable to supply blood with the flow rate and pressure required for all organs, especially the end organs of the body. In this conditions, ventricular assist device help the patients. These devices are used parallel with patient’s heart and supply the large portion of blood that patient’s body needs. In this study, a ventricular assist device and its driving system were designed and manufactured. Due to the fact that the blood is clotting and thrombus in contact with mechanical components such as shafts and bearings, the concept of magnetic suspension and non-contact driving is used in the design of this system. In these types of systems, all of the mechanical components which was said that are the main cause of blood damage are eliminated. After design, the pump which consists of three parts, the impeller, the upper casing and the lower casing, are manufactured by using of 3D printing technology, selective laser sintering(SLS), and drive system manufactured by turning and milling machines. This system is tested after assembly and calibration. In the first test by use of water as fluid, characteristic curve that consists of pressure head, performance, power and net positive head suction versus flow is obtained. In the second test this system was tested in Tehran heart center hospital with human blood accordance to standard of rotating ventricular device and changes in the blood-forming particles during the test was analyzed that successful results are obtained
  9. Keywords:
  10. Blood Pumps ; Heart Pump ; Ventricular Assist Device ; Circulatory Mechanical Blood ; Centrifugal Heart Pump ; Magnetic Suspension System

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