Jonas Navickas “Analysis of the effect of high frequency vibrations on human biological tissues”

Thesis Defense

Author, Institution: Jonas Navickas, Kaunas University of Technology,

Science area, field of science: Technological Sciences, Mechanical Engineering – 09T

Summary of doctoral thesis: Summary

Scientific Supervisor: Habil. Dr. Algimantas Bubulis (Kaunas University of Technology, Mechanical Engineering, 09T).

Dissertation Defence Board of Mechanical Engineering Science Field:
Dr. Rolanas Daukševičius (Kaunas University of Technology, Technological Sciences, Mechanical Engineering, 09T) – chairman
Prof. Dr. Rimvydas Gaidys (Kaunas University of Technology, Technological Sciences, Mechanical Engineering, 09T,
Prof. Dr. Evguenia Korobko (A.V. Luikov Heat and Mass Transfer Institute, Belarus, Technological Sciences, Mechanical Engineering, 09T),
Prof. Dr. Juozas Padgurskas (Aleksandras Stulginskis University, Technological Sciences, Mechanical Engineering, 09T)

The doctoral dissertation is available on the internet and at the libraries of Kaunas University of Technology (K. Donelaičio str. 20, Kaunas) and Aleksandras Stulginskis University (Studentų g. 11, Akademija, Kauno raj.).


Cardiovascular diseases are the leading cause of death among people. The aim of the research is to investigate the effect of the invasive ultrasonic vascular clearing systems on live human tissues and improve the active members that are currently used.

In order to achieve the aim, the following objectives were set: 1) To accomplish analysis of literature on the human cardiovascular system covering the currently known effects of ultrasound, and to collect data on waveguides currently being used for the purpose of vascular clearing; 2) To develop a multipurpose waveguide suitable for restoring the functioning of the blood vessels in an interventional way;  3) To develop a technique for the research of the cavitation process within fluids while mathematically modeling the waveguide operating within the tissue-confined fluid; 4) To investigate experimentally the new waveguide to find out the effects it has on human tissues, and to determine the operational characteristics of the system under consideration.

This work is carried out by using theoretical and experimental research methods. The theoretical studies were performed by using COMSOL MULTIPHYSICS computer software packages. All the studies were created and performed in Kaunas University of Technology.

An innovative waveguide of a unique shape has been designed for invasive clearing of blood vessels capable of generating the cavitation flow by means of inducing mechanical multidimensional vibrations of ultrasonic frequency.

August 30 d. 12:00

Dissertation Defence Hall at Kaunas University of Technology (K. Donelaičio g. 73, room 403, Kaunas)

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