Philipp A. Federspil

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OBJECTIVE In some surgical specialties (eg, orthopedics), robots are already used in the operating room for bony milling work. Otological surgery and otoneurosurgery may also greatly benefit from the enhanced precision of robotics. STUDY DESIGN Experimental study on robotic milling of oak wood and human temporal bone specimen. METHODS A standard(More)
Introduction: Robotic surgery at the lateral skull base must be navigated due to the noble adjacent structures. The accuracy of CT based intraoperative navigation is limited by the resolution of the CT scan itself, but could be substantially improved by using ultrasound scanning. Material and Methods: 24 human skull bone specimen fixed in formaldehyde were(More)
The domain of the surgery robots is today in milling at bony structures. Since robots provide extreme precision and do not fatigue, they offer themselves their application in particular with lengthy and at the same time highly precise milling processes within the area of the lateral head base. For this reason a method was developed, which calculates a(More)
Sensitive structures of the lateral skull base demand for robotic procedures a higher precision than provided by standard navigation systems relying on CT scans. Keystone of our multisensor approach to improve accuracy is the use of ultrasound for local navigation. In this study we compare two different ultrasound techniques to measure human skull bone in(More)
– Surgical procedures with navigation or robot system support usually require pre-operative planning data. This data can be acquired with imaging techniques such as computed tomography (CT), the current gold standard due to its high precision. With such imaging data, access trajectories, implant positions, individual milling paths etc. can be computed. We(More)
Excellent precision, miss of retiring, reproducibility are main characteristics of robots in the operating theatre. Because of these facts their use for surgery in the lateral scull base is of great interest. In recent experiments we determined process parameters for robot assisted reaming of a cochlea implant bed and for a mastoidectomy. These results(More)
HYPOTHESIS A-mode ultrasound scanning with coded signals allows bone thickness measurements at the site of bone-anchored hearing aid surgery as compared to computed tomographic scanning and mechanical measurements. BACKGROUND Adequate bone thickness is a prerequisite for successful, long-lasting osseointegration of titanium fixtures for bone-anchored(More)
Due to shortcomings of conventional hearing aid technology, such as unsatisfactory sound quality due to limited frequency range and undesired distortion, occlusion of the outer ear canal, and acoustic feedback with high amplification, but also psychological aspects of stigmatization, a significant of patients in need of hearing aids are actually not wearing(More)
The knowledge of skull bone thickness would be helpful for a great variety of surgical interventions of the head. Ultrasound (US) can offer this information intraoperatively in real time. A-mode US measurements of skull bone thickness were performed with different pulse characteristics: 1) in water and 2) by directly coupling a 2.25-MHz US transducer(More)
Craniofacial prostheses, also known as epistheses, are artificial substitutes for facial defects. The breakthrough for rehabilitation of facial defects with implant-retained prostheses came with the development of the modern silicones and bone anchorage. Following the discovery of the osseointegration of titanium in the 1950s, dental implants have been made(More)