Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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Subject: search.filters.subject.Computer-assisted surgery

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  • Master Thesis
    Gravity Compensation of a 2r1t Mechanism With Remote Center of Motion for Minimally Invasive Transnasal Surgery Applications [master Thesis]
    (01. Izmir Institute of Technology, 2021) Aldanmaz, Ataol Behram; Artem, Hatice Seçil; Dede, Mehmet İsmet Can; Artem, Hatice Seçil; Dede, Mehmet İsmet Can
    In this work, gravity balancing of a 2URRR-URR parallel manipulator is issued. The manipulator is designed as an endoscope holder for minimally invasive transnasal pituitary gland surgery application. In the surgery, the endoscope is placed through the nostril of the patient where there is a natural path to the pituitary gland. In case of a motor failure, in order to protect the patient and to ease the control of the manipulator static balancing for this manipulator is worked out, the manipulator prototype is balanced and tested. The parallel manipulator has three legs. The payload mass has been distributed to side legs due to workspace limitations. By using counter-mass for two links in each leg, the center of mass of each leg has been reduced to the proximal link which simplified the balancing problem to balancing of a two degree-of-freedom inverted pendulum. By connecting a zero free length spring to the proximal link the total mass of the leg the manipulator has been kept in static balance in its desired workspace. Simulations show that with the applied design, torque effects on the motors have been reduced by 93.5%. Finally, the balancing solution is applied on the manipulator with active motors and the manipulator has been balanced, the torque values mostly has been decreased where the joint clearance, spring tension adjustments and mechanical constraints has affected the results. With the elimination of the joint clearance, mechanical constraints and rearranging the spring tension the required torque could be minimized.
  • Master Thesis
    Surgery Simulator Design for Minimally Invasive Pituitary Gland Surgery
    (01. Izmir Institute of Technology, 2021) Büyüköztekin, Tarık; Dede, Mehmet İsmet Can
    Today, interest in robotics applications in the medical field has increased as well as in every field of the industry due to the development in robotic technology and control. The use of robots in surgeries has become widespread. Researchers in Izmir Institute of Technology and Hacettepe University have produced a surgical assistance robot named NeuRoboScope for minimal invasive pituitary gland tumor surgeries. This robot handles and directs the endoscope during the surgery by receiving motion demands from the surgeon via a master system that is composed of a wearable ring and a foot pedal This thesis study aims to develop a simulator to train the surgeons for using the NeuRoboScope system. For this purpose, NeuRoboScope Surgery Simulator v2 (NSSv2) has been developed in which it is aimed to simulate operation conditions as well as the ideal conditions for NeuRoboScope education. To simulate the operation conditions, surgical instruments, endoscope and NeuRoboScope system controlling this endoscope are included in the simulator replicating the process of minimally invasive pituitary gland tumor surgery. NSSv2 system uses 2 haptic devices, a specially designed control ring that controls the active part of the NeuRoboScope system and has an inertial measurement unit and also wirelessly communicates with the system, a foot pedal activating the control of the ring, a model skull to determine the surgery region and a monitor that receives the visual feedback of the simulation to control the surgical instruments from the physical environment. In addition to training, it is aimed to customize the NeuRo boScope's teleoperation system with respect to user needs and operation styles. In line with this objective, the user calibration mode is generated. In this way, an efficient and customized control system is created for the use of the NeuRoboScope system. A training procedure is developed with several scenarios within the NSSv2 system. When users carry out this training, the completion time of the scenario, the number of pedal usage, and the amount of motion of the surgical tools are recorded by the system. Improvements in the capabilities of users can be observed and the efficiency of NSSv2 can be evaluated owing to these data.