Torque property of titanium alloy cerebral aneurysm clips in a magnetic resonance scanner
| Autor: | Naoyuki Nomura, Shingo Kawahira, Toru Yamamoto, Minghui Tang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
0206 medical engineering Alloy Biomedical Engineering Biophysics chemistry.chemical_element Bioengineering Biocompatible Materials 02 engineering and technology engineering.material Rod Biomaterials Materials Testing medicine Torque Elgiloy Anisotropy Titanium medicine.diagnostic_test technology industry and agriculture Titanium alloy Magnetic resonance imaging equipment and supplies 021001 nanoscience & nanotechnology Surgical Instruments 020601 biomedical engineering Magnetic Resonance Imaging chemistry engineering 0210 nano-technology Biomedical engineering |
| Zdroj: | Journal of materials science. Materials in medicine. 31(1) |
| ISSN: | 1573-4838 |
| Popis: | Titanium (Ti) alloys have been introduced in magnetic resonance (MR) safe implantable medical devices because the susceptibility of Ti is approximately 1/10 that of the Co-Cr-Ni alloy (Elgiloy), which was the previously preferred MR-safe material. The torque applied to metallic materials in an MR imaging (MRI) scanner is commonly believed to increase with the susceptibility of the material. However, a visual inspection showed that the torque applied to Ti alloy cerebral aneurysm clips is comparable with that in the case of those of Elgiloy. In this study, we measured the torque applied to the small test pieces of rods and aneurysm clips quantitatively in a 3-T MRI using an accurate self-developed torque measurement apparatus. The maximum torques of Ti alloy and Elgiloy rod test pieces were comparable as 1.1 and 1.2 µN·m, respectively. The values for Ti alloy aneurysm clips were distinctly higher than the values for those of Elgiloy. These contradictory results of a larger torque for smaller-susceptibility products could be explained by our new theory, which takes into account the crystal susceptibility anisotropy in addition to the conventional torque due to the shape anisotropy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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