Browsing by Author "Kisioglu, Y"

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    Development of bone chip-vacuum system in orthopedic drilling process
    Gok, K; Erdem, M; Kisioglu, Y; Gok, A; Tumsek, M
    Overheating occurs during the bone drilling process using drill bits in orthopedic surgery. The temperatures frequently exceed 47 degrees C, usually accepted as critical value, since the bones and surrounding tissues burn and then cause the necrosis during the drilling process. To prevent this, orthopedic surgeons either spray coolants to the drilling zone or pause the drilling process until the bones and tissues cool down. Such heat damage in bones and soft tissues is undesirable event for surgeons. The bone chips, sometimes, are also complicating the bone fracture fixations. In this study, an investigation is described the effects of the processing parameters on bone chip formations, temperature levels and chip-vacuuming performances during drilling. The temperature levels are also measured using thermocouple devices. A bone chip collecting system is developed as a specific device to collect the chips or fragments using vacuuming technique. The collected bone chips are stored in a pot (reservoir) and delivered to a reparative site in case of necessary. Some design parameters for the developed vacuum system are identified considering the temperature rise during the drilling process. Analyzing the effects of these parameters on chip formation and developed vacuum system statistically and some results are presented. At the end of the study, the bone chip-vacuum device was developed and performed successfully to collect the whole fragments in the bone drilling experimental tests. The chip-collecting device was also useful to remove overheat from the drilling zone. The optimal level of the processing parameters was calculated as A1B3C1 for both vacuumed and non-vacuumed conditions. The fractured powder-type chips were formed as anticipated using the cortical structure of diaphyseal part of calf bone which is helpful for chip vacuuming device.
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    Computer Aided Finite Element Simulation of the Developed Driller System for Bone Drilling Process in Orthopedic Surgery
    Gok, K; Gok, A; Kisioglu, Y
    Heat reveals during the bone drilling operations in orthopedic surgery because of friction between bone and surgical drill bit. The heating causes extremely important damages in bone and soft tissues. The heating has a critical threshold and it is known as 47 degrees C. If bone temperature value exceeds 47 degrees C, osteonecrosis occurs in bones and soft tissues. Many factors such as surgical drill bit geometry and material, drilling parameters, coolant has important roles for the temperature rise. Many methods are used to decrease the temperature rise. The most effective method among them is to use the coolant internally. Numeric simulations of a new driller system to avoid the overheating during the orthopedic operating processes were performed in this study. The numerical simulation with/without coolant was also performed using the finite element based software. Computer aided simulation studies were used to measure the bone temperatures occurred during the bone drilling processes. The outcomes from the simulations were compared with the experimental results. A good temperature level agreement between the experimental results and FEA simulations was found during the bone drilling process.