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Your search keyword '"Kitamura, Mitsuru"' showing total 17 results
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3. A Case Report of a Middle Ear Mass Originated From Cartilage-like Tissue Treated With Transcanal Endoscopic Ear Surgery.

Author

Suda, Satoshi, Kitamura, Mitsuru, Kawaida, Miho, Fujioka, Masato, and Ozawa, Hiroyuki

Subjects
*MIDDLE ear surgery, *EAR tumors, *CONDUCTIVE hearing loss, *COMPUTED tomography, *ENDOSCOPIC surgery, *AUDIOMETRY, *HEARING disorders, *EAR surgery, *ENDOSCOPY
Abstract

Middle ear tumors are relatively rare, and among them, the diagnoses of middle ear lesions originating from cartilage-like tissue are even rarer. Use of transcanal endoscopic ear surgery (TEES) has increased in recent years because of its advantages, such as clear visual field and minimally invasive procedure. Here, we report a middle ear mass originating from cartilage-like tissue treated with TEES. A 62-year-old woman presented with progressive right-sided hearing loss. A white mass was revealed through the tympanic membrane, and pure-tone audiometry detected a mean 50.0 dB conductive hearing loss. Computed tomography showed a mass in the tympanic cavity. TEES was performed for diagnosis and treatment. A white translucent tumor was observed intraoperatively, and it was completely resected. Histopathological examination confirmed the diagnosis of a mass originating from degenerated cartilage-like tissue. To the best of our knowledge, this is the first study of a middle ear mass originating from cartilage-like tissue treated with TEES. TEES with its clear visual field and precise techniques was beneficial in treating the middle ear lesions circumscribed in the tympanic cavity. [ABSTRACT FROM AUTHOR] more...

Published
2024
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13. Formal Synthesis of Teadenols via Palladium-Catalyzed 6-endo Cyclization of an Epoxyphenol

Author

Kitamura, Mitsuru, primary, Suetake, Hiroki, additional, Hoshino, Kosuke, additional, Higashijima, Yuta, additional, Kisanuki, Masato, additional, Yuasa, Ryohei, additional, Yamaguchi, Yukihiro, additional, Shimazu, Takahiro, additional, Koga, Naoya, additional, Hamada, Hiro, additional, Miyori, Nobuhiro, additional, Shimooka, Hirokazu, additional, and Okauchi, Tatsuo, additional more...

Published
2022
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16. Design optimization of functionally graded lattice infill total hip arthroplasty stem for stress shielding reduction.

Author

Nomura, Jumpei, Takezawa, Akihiro, Zhang, Heng, and Kitamura, Mitsuru

Abstract

Reducing stress shielding of stem-inserted femurs in total hip arthroplasty caused by the high stiffness of the stem is an emerging medical engineering issue. In this study, a numerical design optimization methodology lattice infill stem was developed to realize a stem, balancing the low stiffness and strength requirements. Two pairs of models and loading conditions were introduced for the stress shielding and strength criteria. The objective function was set as the weighted sum of the criteria. Its effective density distribution was optimized by handling the representative size of the lattice as a design variable, assuming that the so-called body-centered cubic lattice was the base shape of the lattice. In the optimization, the approximated model of the lattice was handled as a solid material with the effective physical properties of the lattice derived by the homogenization method. After optimization, the detailed lattice stem geometry was modeled based on the obtained optimal lattice distribution, and the actual performance was numerically evaluated. The developed stem increased the stress applied to the remaining femur by 32.4% compared with the conventional stem. [ABSTRACT FROM AUTHOR] more...

Published
2022
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