Abstract
Purpose
Flexible ureteroscopy (FURS) plays an important role in the diagnosis and treatment of urological diseases. However, manipulating a flexible ureteroscope to the target quickly and safely may be challenging because of the tortuous lumen or poor visibility. Thus, information on the shape of the anterior part of a flexible ureteroscope in addition to the real-time pose is needed to perform accurate maneuvering in the lumen with minimal impingement on the inner renal wall and resulting tissue damage in FURS.
Methods
An adaptive mixed-order Bézier curve fitting algorithm and electromagnetic tracking (EMT) technique were developed for shape estimation utilizing the length of the anterior part, kinematic constraints and the pose information provided by two electromagnetic (EM) sensors mounted at the tip and base of the anterior part. A series of experiments were performed to qualitatively and quantitatively verify the validity of our method. Moreover, algorithm threshold conditions with reference significance under various shape cases were studied.
Results
The performance of our method was evaluated based on 19 representative planar bending shapes that often appear in FURS and eight non-planar shapes, yielding an average error (AE) of 1.0 mm. Moreover, the experiments proved the feasibility of applying our method in cases in which large bending angles (near 270 degrees) occur.
Conclusion
Based on data from two EM sensors mounted at the tip and base of the anterior part of a flexible ureteroscope, the proposed algorithm adaptively selects a cubic or quartic Bézier curve to fit the shape of the anterior part. Experimental results prove the feasibility of our shape estimation method over a broad bending range. The proposed method demonstrates significant potential for use in ureteroscopic navigation systems and robot-assisted surgery.













Similar content being viewed by others
References
Yoshida K, Kawa G, Taniguchi H, Inoue T, Mishima T, Yanishi M, Sugi M, Kinoshita H, Matsuda T (2014) Novel ureteroscopic navigation system with a magnetic tracking device: a preliminary ex vivo evaluation. J Endourol 28(9):1053–1057
Li Z-G, Zhao Y, Fan T, Hao L, Han C-H, Zang G-H (2016) Clinical effects of FURL and PCNL with holmium laser for the treatment of kidney stones. Exp Ther Med 12(6):3653–3657
Kuroda S, Ito H, Sakamaki K, Tabei T, Kawahara T, Fujikawa A, Makiyama K, Yao M, Uemura H, Matsuzaki J (2018) A new prediction model for operative time of flexible ureteroscopy with lithotripsy for the treatment of renal stones. PLoS One 13(2):e0192597
Shi C, Luo X, Qi P, Li T, Song S, Najdovski Z, Fukuda T, Ren H (2016) Shape sensing techniques for continuum robots in minimally invasive surgery: a survey. IEEE Trans Biomed Eng 64(8):1665–1678
Presti DL, Massaroni C, Leitão CSJ, Domingues MDF, Sypabekova M, Barrera D, Floris I, Massari L, Oddo CM, Sales S (2020) Fiber Bragg gratings for medical applications and future challenges: a review. IEEE Access 8:156863–156888
Khan F, Denasi A, Barrera D, Madrigal J, Sales S, Misra S (2019) Multi-core optical fibers with Bragg gratings as shape sensor for flexible medical instruments. IEEE Sens J 19(14):5878–5884
Lu Y, Lu B, Li B, Guo H, Liu Y-h (2021) Robust three-dimensional shape sensing for flexible endoscopic surgery using multi-core FBG sensors. IEEE Robot Automation Lett 6(3):4835–4842
Kim JS, Guo J, Chatrasingh M, Kim S, Iordachita I (2017) Shape determination during needle insertion with curvature measurements. In: 2017 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), IEEE, pp. 201–208
Ha XT, Ourak M, Al-Ahmad O, Wu D, Borghesan G, Menciassi A, Vander Poorten E (2021) Robust catheter tracking by fusing electromagnetic tracking, fiber bragg grating and sparse fluoroscopic images. IEEE Sens J 21(20):23422–23434. https://doi.org/10.1109/jsen.2021.3107036
Hoeckelmann M, Rudas IJ, Fiorini P, Kirchner F, Haidegger T (2015) Current capabilities and development potential in surgical robotics. Int J Adv Rob Syst 12(5):61
Franz AM, Haidegger T, Birkfellner W, Cleary K, Peters TM, Maier-Hein L (2014) Electromagnetic tracking in medicine—a review of technology, validation, and applications. IEEE Trans Med Imag 33(8):1702–1725
Luo X, Wan Y, He X (2015) Robust electromagnetically guided endoscopic procedure using enhanced particle swarm optimization for multimodal information fusion. Med Phys 42(4):1808–1817
Shi C, Tercero C, Wu X, Ikeda S, Komori K, Yamamoto K, Arai F, Fukuda T (2016) Real-time in vitro intravascular reconstruction and navigation for endovascular aortic stent grafting. Int J Med Robot Comput Assist Surg 12(4):648–657
Lima E, Rodrigues PL, Mota P, Carvalho N, Dias E, Correia-Pinto J, Autorino R, Vilaca JL (2017) Ureteroscopy-assisted percutaneous kidney access made easy: first clinical experience with a novel navigation system using electromagnetic guidance (IDEAL Stage 1). Eur Urol 72(4):610–616
Song S, Li Z, Yu H, Ren H (2015) Electromagnetic positioning for tip tracking and shape sensing of flexible robots. IEEE Sens J 15(8):4565–4575
Ryu SC, Dupont PE (2014) FBG-based shape sensing tubes for continuum robots. In: 2014 IEEE International Conference on Robotics and Automation (ICRA), IEEE, pp. 3531–3537s
Kim B, Ha J, Park FC, Dupont PE (2014) Optimizing curvature sensor placement for fast, accurate shape sensing of continuum robots. In: 2014 IEEE international conference on robotics and automation (ICRA), IEEE, pp. 5374–5379
Jäckle S, Eixmann T, Schulz-Hildebrandt H, Hüttmann G, Pätz T (2019) Fiber optical shape sensing of flexible instruments for endovascular navigation. Int J Comput Assist Radiol Surg 14(12):2137–2145
Song S, Li Z, Yu H, Ren H (2015) Shape reconstruction for wire-driven flexible robots based on Bézier curve and electromagnetic positioning. Mechatronics 29:28–35
Song S, Li Z, Meng MQ-H, Yu H, Ren H (2015) Real-time shape estimation for wire-driven flexible robots with multiple bending sections based on quadratic Bézier curves. IEEE Sens J 15(11):6326–6334
Sadjadi H, Hashtrudi-Zaad K, Fichtinger G (2013) Fusion of electromagnetic trackers to improve needle deflection estimation: simulation study. IEEE Trans Biomed Eng 60(10):2706–2715
Sadjadi H, Hashtrudi-Zaad K, Fichtinger G (2014) Needle deflection estimation: prostate brachytherapy phantom experiments. Int J Comput Assist Radiol Surg 9(6):921–929
Condino S, Ferrari V, Freschi C, Alberti A, Berchiolli R, Mosca F, Ferrari M (2012) Electromagnetic navigation platform for endovascular surgery: How to develop sensorized catheters and guidewires. Int J Med Robot Comput Assist Surg 8(3):300–310
Condino S, Calabrò E, Alberti A, Parrini S, Cioni R, Berchiolli RN, Gesi M, Ferrari V, Ferrari M (2014) Simultaneous tracking of catheters and guidewires: comparison to standard fluoroscopic guidance for arterial cannulation. Eur J Vasc Endovasc Surg 47(1):53–60
Gomes P (2012) Medical robotics: Minimally invasive surgery. Elsevier
Gao A, Liu N, Shen M, EMK Abdelaziz M, Temelkuran B, Yang G-Z (2020) Laser-profiled continuum robot with integrated tension sensing for simultaneous shape and tip force estimation. Soft Robot 7(4): 421–443
Glodny B, Unterholzner V, Taferner B, Hofmann KJ, Rehder P, Strasak A, Petersen J (2009) Normal kidney size and its influencing factors-a 64-slice MDCT study of 1040 asymptomatic patients. BMC Urol 9(1):1–13
Haidegger T (2019) Autonomy for surgical robots: Concepts and paradigms. IEEE Trans Med Robot Bionics 1(2):65–76
Acknowledgements
This research was supported by the National Major Scientific Research Instrument Development Project (Grant No. 81827804), and the Robotics Institute of Zhejiang University (Grant Nos. K11806), and the Key Research and Development Plan of Zhejiang Province (Grant Nos. 2022C03086 and 2017C03036).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
The authors declare that they have no conflict of interest.
Ethical approval
This article does not contain any studies with human participants or animals performed by any of the authors.
Informed consent
The data used in this paper are a public dataset and it is anonymous, not used for commercial purposes, but for research purposes only.
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Zhang, C., Hu, C., He, Z. et al. Shape estimation of the anterior part of a flexible ureteroscope for intraoperative navigation. Int J CARS 17, 1787–1799 (2022). https://doi.org/10.1007/s11548-022-02670-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11548-022-02670-8