Metrological safeguarding of a drilling process in image-supported minimally invasive procedures using the otobase as an example

Key Info

Basic Information

01.06.2016 to 30.06.2018
Organizational Unit:
Chair of Production Metrology and Quality Management, Model-based Systems
German Research Foundation DFG

Research partner

  • University ENT Clinic of Heinrich Heine University Düsseldorf



Anna-Lena Knott

Research Assistant


+49 241 80 20600


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Cochlear implants are used as hearing aids. The aim of current research is to implant the electrode with a minimally invasive procedure via three drill channels in order to reduce the regeneration time of the patient. The drill channels are planned using the patient's image data. Due to uncertainties in the surgical process, the drilled hole deviates from the planned path. Any deviation influences the risk of injury to nerves and blood vessels. The risk of mechanical injuries due to the uncertainty of manual positioning and image data quality was successfully determined in the Mukno project. In addition to this risk, there is also the risk of thermal damage to nerves.

The project "Mambo" focuses on the thermal injury risk. The aim is the intraoperative display of the temperature in the drill ground via an assistance system. A drill with integrated temperature sensors was developed in order to measure the temperature of the minimally invasive surgical process. The drill transmits the temperature at the bottom of the drill in real time to an evaluation device. This provides a data basis on the basis of which decisions for the drilling process are made. By linking the drilling process parameters with the resulting drilling base temperature, a model is developed from which recommendations for action to control the drilling process are created. In this way, changes during the drilling process can be reacted to quickly in order to minimise the risk of damage to the patient due to increased temperature.

The drill and the model relationships between drilling parameters and the resulting drilling base temperature are not only used in medical technology. In production engineering, too, there are drilling processes, e.g. of CFRP, in which an increased temperature leads to damage to the material, such as delamination. The project results can therefore be used across industries.