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. 2023 Oct 11;41(12):3619–3627. doi: 10.1007/s00345-023-04648-w

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig.3 — A The NTFS-UAS combined with flexible ureteroscope and vacuum device during operation: ①—main body of NTFS-UAS; ②—straight tube acted as flexible ureteroscope pathway; ③—oblique tube acted as suctioning channel connected with vacuum device and collecting bottle; ④—bottle for collecting fragments. B The tip of NTFS-UAS reached target calyx and stone. C Fragments fell out as the endoscope retreated. D Stone fragments