Cutting Tool Protects for Soft Tissues in Bone-Milling Machining
Naohiko Sugita*, Taiga Nakano*, Takayuki Osa*, Yoshikazu Nakajima*, Kazuo Fujiwara**, Nobuhiro Abe**, Toshifumi Ozaki**, Masahiko Suzuki***, and Mamoru Mitsuishi*
*Department of Engineering Synthesis, School of Engineering, The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
**Graduate School of Medicine, Density and Pharmaceutical Sciences, Okayama University
2-5-1 Shikata-cho, Okayama-city, Okayama 700-8558, Japan
***Graduate School of Medicine, Chiba University
1-8-1 Inohana, Chuo-ku, Chiba 260-8677, Japan
Minimally invasive orthopedic surgery using a milling machine presents challenges. The milling machine we developed has a redundant axis to minimize cutting-tool contact with surrounding soft tissue. Important components are modeled based on physical requirements, and model-based geometric optimization improves performance. Here we discuss the protective mechanism, hardware, and software we developed to cover the nonworking cutting-edge portion and to protect against soft-tissue damage. We evaluated the effectiveness of this approach using cadaveric bone.
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