Biomedical subjects

Hidenori Ono

Publications and source records attributed to Hidenori Ono.

5 recordsLinked to original sources

PubMed2006

Three-dimensional laryngeal model for planning of laryngeal framework surgery.

CONCLUSION: The three-dimensional prototype model was useful for planning of laryngeal framework surgery. OBJECTIVE: To discuss the usefulness of a three-dimensional laryngeal model for laryngeal framework surgery. MATERIALS AND METHODS: A three-dimensional laryngeal model was created based on the postoperative helical computed tomography (CT) data of the larynx (case 1) which underwent lateral cricoarytenoid muscle (LCA) pull surgery. LCA pull surgery is a kind of arytenoid adduction for unilateral vocal cord paralysis. A three-dimensional model of case 1 larynx was prototyped using a selective laser sintering method. In case 1, the patient's voice did not improve after LCA pull surgery. The three-dimensional model revealed that the original surgical procedure was not appropriate to obtain optimal arytenoid adduction. According to the analysis of this three-dimensional model, we changed the surgical approach and performed this new refined LCA pull surgery on another patient with unilateral vocal cord paralysis (case 2). RESULTS: We were able to pull LCA precisely in case 2. Three-dimensional CT of case 2 after refined LCA pull surgery allowed the correct pulling of LCA and complete adduction of arytenoid. The postoperative voice improved remarkably.

Aged↗

PubMed2005

Application of a rapid-prototyped temporal bone model for surgical planning.

CONCLUSION: This 3D prototyped model constructed using a selective laser sintering method serves as a good material for surgical simulation of a malformed ear. OBJECTIVE: In order to perform surgery of the malformed ear, a thorough understanding of the anatomy of the ear is required, together with sufficient experience. The aim of this study was to investigate the validity of a prototyped temporal bone model for surgical simulation. MATERIAL AND METHODS: Simulated 3D models of two cases of congenital aural atresia were prototyped using a selective laser sintering method. Conventional surgical instruments were used to dissect the models. RESULTS: Abnormal structures of the middle ear, such as the ossicles, labyrinth and facial nerve, were identified by dissecting the model. Presurgical dissection informed the surgeon of the optimum orientation for surgery. The model was disinfected and could be handled by the surgeon in the operating room. Surgery could be carried out safely although in one case it was canceled because of the highly abnormal location of the middle ear cleft and facial nerve.

Adult↗

PubMed2004

Rapid prototyping of temporal bone for surgical training and medical education.

OBJECTIVE: The skills of ear surgery are best developed by dissecting a temporal bone. However, only a limited number of trainees can be afforded this opportunity because of the scarcity of available bones. The aim of this study was to investigate the validity of a prototype temporal bone model for surgical training and education. MATERIAL AND METHODS: A simulated 3D model of a human temporal bone was made using a selective laser sintering method. The powder layers were laser-fused based on detailed CT data and accumulated to create a 3D structure. Conventional surgical instruments were used to dissect the model under a microscope. RESULTS: The model was as hard as real bone and surface structures were accurately reproduced. The model could be shaved using a surgical drill, burr and suction irrigator in the same way as a real bone. The malleus and incus were reproduced. The semicircular canals and the oval and round window niches were identified. Cavity structures, such as the semicircular canal, vestibule, antrum and air cells, were filled with powder which had to be removed using a pick and suction irrigator during dissection. A magnified model was useful for educating medical students. CONCLUSION: This prototype 3D model made using selective laser sintering serves as a good educational tool for middle ear surgery.

Humans↗

PubMed2004

Rapidly prototyped temporal bone model for otological education.

The anatomy of the temporal bone is extremely complicated. If a three-dimensional model could be simulated, it would greatly contribute to the stereoscopic understanding of anatomy and surgery. A simulated three-dimensional model of a human temporal bone was prototyped using the selective laser sintering method. The model could be shaved using a surgical drill in the same way as in real surgery. A magnified model was particularly useful for the instruction of anatomy and surgery. When a translucent area was selected, a bony labyrinth could be created together with an internal auditory meatus and facial nerve, which also contributed to the easy understanding of the inner ear structure. The three-dimensional prototyped model using selective laser sintering serves as a good educational material for middle ear anatomy and surgery.

Humans↗

PubMed2004

[Rapid prototyping of the larynx for laryngeal frame work surgery].

A detailed understanding of the three-dimensional (3D) structure of the larynx is important for determining appropriate methods and approaches for laryngeal frame work surgery. In this study, a 3D laryngeal model was constructed based on postoperative helical CT data obtained after lateral cricoarytenoid muscle (LCA) pull surgery (Iwamura) for the treatment of unilateral vocal fold paralysis. The anatomical configurations of the arytenoid cartilages and the optimal approaches for laryngeal frame work surgery were then examined. A 3D model of the human larynx was prototyped using a selective laser sintering method. A compound powder of plastic nylon and an inorganic substance (glass beads) was used as the raw material. The cricoid cartilage and the arytenoid cartilages were prototyped, and the configurations of the arytenoid cartilages were evaluated. The results were similar to those of previous reports. The arytenoid cartilage of the unaffected side moved downward while adducting, and the vocal process moved inwards and downwards. On the other hand, the paralyzed arytenoid cartilage moved neither inward nor downward, and the vocal process was fixed at an outer and upper position. Next, the thyroid cartilage was added to the model to determine the optimal location of the window in the thyroid cartilage for the LCA pull surgery. The window after the first surgery was largened using a surgical drill. The 3D prototype model was useful for understanding the complex configurations of the laryngeal anatomy, and to determine the optimal approaches for laryngeal frame work surgery, etc.

Arytenoid Cartilage↗