Deflection Modeling and Curvature Manipulation of a Variable-Stiffness Flexible Needle
To address the need for improving the flexibility of flexible needles, a technique that achieves needle steering by altering the needle’s stiffness is proposed. Needle tip forces were simplified, and a deflection model was then developed based on the Timoshenko beam theory. By combining theory and s...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-03-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/15/7/3746 |
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| author | Guozhao Wei Zhixing Liu Hanwen Yu Zhenzhong Zhang Kun Li |
| author_facet | Guozhao Wei Zhixing Liu Hanwen Yu Zhenzhong Zhang Kun Li |
| author_sort | Guozhao Wei |
| collection | DOAJ |
| description | To address the need for improving the flexibility of flexible needles, a technique that achieves needle steering by altering the needle’s stiffness is proposed. Needle tip forces were simplified, and a deflection model was then developed based on the Timoshenko beam theory. By combining theory and simulation, the influences of the stylet diameter, extension length, and tip direction on needle bending were analyzed. The deflection of the flexible needle is proportional to the cube of the stylet extension length. The needle with a 0.4 mm stylet diameter and an 8 mm extension length produces 8.841 mm more deflection than conventional flexible needles. The extension length can effectively regulate the bending curvature of the flexible needle, thus improving the flexibility of the puncture to some extent. |
| format | Article |
| id | doaj-art-66726c20254b4c67805eae0f8a7af25d |
| institution | OA Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-66726c20254b4c67805eae0f8a7af25d2025-08-20T02:09:14ZengMDPI AGApplied Sciences2076-34172025-03-01157374610.3390/app15073746Deflection Modeling and Curvature Manipulation of a Variable-Stiffness Flexible NeedleGuozhao Wei0Zhixing Liu1Hanwen Yu2Zhenzhong Zhang3Kun Li4School of Mechanical and Electronic Engineering, Shandong Jianzhu University, Jinan 250101, ChinaSchool of Mechanical and Electronic Engineering, Shandong Jianzhu University, Jinan 250101, ChinaSchool of Mechanical and Electronic Engineering, Shandong Jianzhu University, Jinan 250101, ChinaSchool of Mechanical and Electronic Engineering, Shandong Jianzhu University, Jinan 250101, ChinaSchool of Mechanical and Electronic Engineering, Shandong Jianzhu University, Jinan 250101, ChinaTo address the need for improving the flexibility of flexible needles, a technique that achieves needle steering by altering the needle’s stiffness is proposed. Needle tip forces were simplified, and a deflection model was then developed based on the Timoshenko beam theory. By combining theory and simulation, the influences of the stylet diameter, extension length, and tip direction on needle bending were analyzed. The deflection of the flexible needle is proportional to the cube of the stylet extension length. The needle with a 0.4 mm stylet diameter and an 8 mm extension length produces 8.841 mm more deflection than conventional flexible needles. The extension length can effectively regulate the bending curvature of the flexible needle, thus improving the flexibility of the puncture to some extent.https://www.mdpi.com/2076-3417/15/7/3746minimally invasive surgeriesflexible needlevariable stiffnessneedle steeringdefection model |
| spellingShingle | Guozhao Wei Zhixing Liu Hanwen Yu Zhenzhong Zhang Kun Li Deflection Modeling and Curvature Manipulation of a Variable-Stiffness Flexible Needle Applied Sciences minimally invasive surgeries flexible needle variable stiffness needle steering defection model |
| title | Deflection Modeling and Curvature Manipulation of a Variable-Stiffness Flexible Needle |
| title_full | Deflection Modeling and Curvature Manipulation of a Variable-Stiffness Flexible Needle |
| title_fullStr | Deflection Modeling and Curvature Manipulation of a Variable-Stiffness Flexible Needle |
| title_full_unstemmed | Deflection Modeling and Curvature Manipulation of a Variable-Stiffness Flexible Needle |
| title_short | Deflection Modeling and Curvature Manipulation of a Variable-Stiffness Flexible Needle |
| title_sort | deflection modeling and curvature manipulation of a variable stiffness flexible needle |
| topic | minimally invasive surgeries flexible needle variable stiffness needle steering defection model |
| url | https://www.mdpi.com/2076-3417/15/7/3746 |
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