In minimally invasive surgery and endoscopy, the rise of soft robotics, using materials of similar softness as biological soft tissues, opens many new opportunities. Soft actuated catheters could become an alternative to current steerable catheters, by minimizing the risk of damage to surrounding tissues while enhancing the possibilities to navigate in confined space and to reach remote locations. Fluidic actuators present the advantage to be safe, since they do not require rigid parts nor voltage, to be lightweight, and to allow the reduction of the number of parts needed for a given movement. This work presents the design, development and characterization of a soft fluidic bending actuator for a steerable catheter.
A silicone prototype of 5 mm diameter has been designed. It has one degree of freedom in bending and achieves a radius of curvature below 10 mm. A numerical model has been developed and compared to the experimental results.
Despite an overestimation of the bending, the numerical model properly captures the behaviour of the actuator. This allowed to identify and validate the key design parameters of the actuator, namely the ratio between the pressure channel surface and the actuator cross-section surface. Based on the results, an optimized design has been developed and numerically implemented. The miniaturization and the potential to carry devices with non-negligible bending stiffness have also been discussed.
In this work, a proof of concept of a soft fluidic actuator for a steerable catheter has been designed, developed and characterized. It showed promising results concerning the feasibility of a miniaturized actuator with two degrees of freedom.
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Polygerinos P, Correll N, Morin SA, Mosadegh B, Onal CD, Petersen K, Cianchetti M, Tolley MT, Shepherd RF (2017) Soft robotics: review of fluid-driven intrinsically soft devices; manufacturing, sensing, control, and applications in human–robot interaction. Adv Eng Mater 19(12):1700016. https://doi.org/10.1002/adem.201700016
Gorissen B, Reynaerts D, Konishi S, Yoshida K, Kim JW, De Volder M (2017) Elastic inflatable actuators for soft robotic applications. Adv Mater 29(43):1604977. https://doi.org/10.1002/adma.201604977
Cianchetti M, Laschi C, Menciassi A, Dario P (2018) Biomedical applications of soft robotics. Nat Rev Mater 3(6):143–153. https://doi.org/10.1038/s41578-018-0022-y
Ali A, Plettenburg DH, Breedveld P (2016) Steerable catheters in cardiology: classifying steerability and assessing future challenges. IEEE Trans Biomed Eng 63(4):679–693. https://doi.org/10.1109/TBME.2016.2525785
Le HM, Do TN, Phee SJ (2016) A survey on actuators-driven surgical robots. Sens Actuators A Phys 247:323–354
Burgner-Kahrs J, Rucker DC, Choset H (2015) Continuum robots for medical applications: a survey. IEEE Trans Robot 31(6):1261–1280. https://doi.org/10.1109/TRO.2015.2489500
Blanc L, Delchambre A, Lambert P (2017) Flexible medical devices: review of controllable stiffness solutions. Actuators. https://doi.org/10.3390/act6030023
Hines L, Petersen K, Lum GZ, Sitti M (2017) Soft actuators for small-scale robotics. Adv Mater 29(13):1603483. https://doi.org/10.1002/adma.201603483
De Greef A, Lambert P, Delchambre A (2009) Towards flexible medical instruments: review of flexible fluidic actuators. Precis Eng 33(4):311–321
Suzumori K (1989) Flexible microactuator. Trans Jpn Soc Mech Eng Ser C 55(518):2547–2552
Wakimoto S, Suzumori K, Ogura K (2011) Miniature pneumatic curling rubber actuator generating bidirectional motion with one air-supply tube. Adv Robot 25(9–10):1311–1330. https://doi.org/10.1163/016918611X574731
Inoue Y, Ikuta K (2016) Hydraulic driven active catheters with optical bending sensor. In: 2016 IEEE 29th international conference on micro electro mechanical systems (MEMS), pp 383–386. https://doi.org/10.1109/MEMSYS.2016.7421641
Gerboni G, Ranzani T, Diodato A, Ciuti G, Cianchetti M, Menciassi A (2015) Modular soft mechatronic manipulator for minimally invasive surgery (mis): overall architecture and development of a fully integrated soft module. Meccanica 50(11):2865–2878. https://doi.org/10.1007/s11012-015-0267-0
Elsayed Y, Vincensi A, Lekakou C, Geng T, Saaj CM, Ranzani T, Cianchetti M, Menciassi A (2014) Finite element analysis and design optimization of a pneumatically actuating silicone module for robotic surgery applications. Soft Robot 1(4):255–262. https://doi.org/10.1089/soro.2014.0016
Gorissen B, De Volder M, Reynaerts D (2018) Chip-on-tip endoscope incorporating a soft robotic pneumatic bending microactuator. Biomed Microdevices 20(3):73. https://doi.org/10.1007/s10544-018-0317-1
Fraś J, Czarnowski J, Maciaś M, Główka J, Cianchetti M, Menciassi A (2015) New stiff-flop module construction idea for improved actuation and sensing. In: 2015 IEEE international conference on robotics and automation (ICRA), pp 2901–2906. https://doi.org/10.1109/ICRA.2015.7139595
Abidi H, Gerboni G, Brancadoro M, Fras J, Diodato A, Cianchetti M, Wurdemann H, Althoefer K, Menciassi A (2018) Highly dexterous 2-module soft robot for intra-organ navigation in minimally invasive surgery. Int J Med Robot Comput Assist Surg 14(1):e1875. https://doi.org/10.1002/rcs.1875
Sun Y, Song S, Liang X, Ren H (2016) A miniature soft robotic manipulator based on novel fabrication methods. IEEE Robot Autom Lett 1(2):617–623. https://doi.org/10.1109/LRA.2016.2521889
Arezzo A, Mintz Y, Allaix ME, Arolfo S, Bonino M, Gerboni G, Brancadoro M, Cianchetti M, Menciassi A, Wurdemann H, Noh Y, Althoefer K, Fras J, Glowka J, Nawrat Z, Cassidy G, Walker R, Morino M (2017) Total mesorectal excision using a soft and flexible robotic arm: a feasibility study in cadaver models. Surg Endosc 31(1):264–273. https://doi.org/10.1007/s00464-016-4967-x
Wang Z, Polygerinos P, Overvelde JTB, Galloway KC, Bertoldi K, Walsh CJ (2017) Interaction forces of soft fiber reinforced bending actuators. IEEE/ASME Trans Mechatron 22(2):717–727. https://doi.org/10.1109/TMECH.2016.2638468
Polygerinos P, Wang Z, Overvelde JTB, Galloway KC, Wood RJ, Bertoldi K, Walsh CJ (2015) Modeling of soft fiber-reinforced bending actuators. IEEE Trans Robot 31(3):778–789. https://doi.org/10.1109/TRO.2015.2428504
Yeoh OH (1993) Some forms of the strain energy function for rubber. Rubber Chem Technol 66(5):754–771. https://doi.org/10.5254/1.3538343
Kulkarni P (2015) Centrifugal forming and mechanical properties of silicone-based elastomers for soft robotic actuators. Ph.D. thesis, New Brunswick
Steck D, Qu J, Kordmahale SB, Tscharnuter D, Muliana A, Kameoka J (2019) Mechanical responses of ecoflex silicone rubber: compressible and incompressible behaviors. J Appl Polym Sci 136(5):47025. https://doi.org/10.1002/app.47025
Garriga-Casanovas A, Collison I, Rodriguez y Baena F (2018) Toward a common framework for the design of soft robotic manipulators with fluidic actuation. Soft Robot 5(5):622–649. https://doi.org/10.1089/soro.2017.0105 (pMID: 30161015)
Shiva A, Stilli A, Noh Y, Faragasso A, Falco ID, Gerboni G, Cianchetti M, Menciassi A, Althoefer K, Wurdemann HA (2016) Tendon-based stiffening for a pneumatically actuated soft manipulator. IEEE Robot Autom Lett 1(2):632–637. https://doi.org/10.1109/LRA.2016.2523120
This work was made possible by the support of Boston Scientific and the Michel Cremer Foundation. This work is also supported by the FNRS (Fonds National de la Recherche Scientifique) through the funding of a FRIA Grant.
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Decroly, G., Mertens, B., Lambert, P. et al. Design, characterization and optimization of a soft fluidic actuator for minimally invasive surgery. Int J CARS 15, 333–340 (2020). https://doi.org/10.1007/s11548-019-02081-2
- Soft robotics
- Fluidic actuator
- Steerable catheter
- Minimally invasive surgery
- Finite element modelling