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Design, Fabrication and Analyses of an Ultrasonic Probe for Kidney Lithotripsy Device

Amini, Naseh | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50539 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Ahmadian, Mohammad Taghi; Firoozbakhsh, Keykhosrow
  7. Abstract:
  8. Kidney stone disease is one of the diseases that a large number of people experience each year.A Common method for the treatment of kidney stone is the use of acoustic waves, which have attracted the attention of doctors in recent decades. Because of the different structure of kidney stones, the waves transmitted to break these stones are usually performed at different frequencies. Most kidney stones are calcium that can be broken down by using acoustic wave frequencies in the range of 40-20 KHz. Most available lithotripters for the treatment of percutaneous nephrolithotomy (PCNL) are two types: Pneumatic and piezoelectric lithotripters. The lithotripter in this thesis is a piezoelectric type, which consists of a piezoelectric piece with backing mass and matching layer. A piezoelectric sensor on one way has connected to an ultrasonic concentrator (horn) and on the other way to heavy weighted back mass. This concentrator, which is actually used to amplify the longitudinal vibration amplitude, should be in such a way that it meets the peak frequency at the piezo resonant frequency and generates the largest displacement. In fact, kidney stone is broken down by connecting a probe to the end of the lithotripter machine and its contact with kidney stones and transmitting high-frequency vibrations. The purpose of this thesis is design, dimensional optimization, producing and testing of a piezoelectric lithotripter. For the simulation, the finite element software (ABAQUS) were used. By utilizing modal analysis, we can calculate the longitudinal mode of the transducer. In fact, due to the existing design for piezoelectric lithotripter and the required power, an optimization of the dimension was done on the design and the optimal parameters required were extracted. Finally, after the simulation and producing the optimal design, its performance will be evaluated against the kidney stone samples
  9. Keywords:
  10. Piezoelectric Sensor ; Transducers ; Kidney Stones ; Kidney Diseases ; Ultrasonic Waves ; Kidney Stone Lithotriper ; Longitudinal Vibrations

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