• Tomislav Bruketa, Goran Augustin, Tomislav Staroveški, Miho Klaić, Danko Brezak, Hrvoje Capak, and Ivan Dobrić.
• Department of Surgery, University Hospital Centre Zagreb and School of Medicine University of Zagreb, Kišpatićeva 12, 10000 Zagreb, Croatia. Electronic address: tbruketa@gmail.com.
• Injury. 2021 Sep 1; 52 Suppl 5: S32-S37.

IntroductionInternally cooled bone drills with an open system, conduct coolant directly to the point of contact of cutting surface of the drill and the bone and lower the temperature at the drilling site. During bone drilling with internally cooled drills of open type, there is a possibility that coolant enters the intramedullary canal and has an adverse effect on intramedullary pressure. In this research, the intramedullary distribution of the coolant during and after drilling was analyzed.Materials And MethodsSpecially constructed open type internally cooled medical steel drills were used. Experimental studies were conducted on the porcine femoral bone diaphysis. Coolant (saline) was mixed with water-soluble contrast agent and x-ray images of the distribution of coolant during and after drilling were taken with different regimes of drilling (drill rotational speed from 1300 rpm to 5000 rpm, and coolant flow rate from 0,6 l/min to 1,35 l/min).ResultsAn x-ray images showed that coolant did not spread from the borehole and has not spread intramedullary with any combination of coolant flow and drill rotation regimes.ConclusionCoolant does not disperse into the intramedullary canal outside of the borehole in given flow ranges (0,6-1,35 l/min) and drill rotational speed regimes (1300-5000 rpm). Open type internally cooled can safely be used for bone drilling.Copyright © 2020. Published by Elsevier Ltd.

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