Flexible endoscopes are used for diagnostic and therapeutic interventions in the human body for their ability to be advanced through tortuous trajectories. However, this very same property causes difficulties as well. For example, during surgery, a rigid shaft would be more beneficial since it provides more stability and it allows for better surgical accuracy. In order to keep the flexibility and to obtain the rigidity when needed, a shaft-guide with controllable rigidity could be used. In this article, we introduce the plastolock shaft-guide concept, which uses thermoplastics that are reversibly switched from rigid to compliant by changing their temperatures from to . These materials are used to make a shaft that can be rendered flexible to follow the flexible endoscope and rigid to guide it. To find polymers that are suitable for the plastolock concept, an extensive database and internet search was performed. The results suggest that many suitable materials are available or can be custom synthesized to meet the requirements. The thermoplastic polymer Purasorb® PLC 7015 was obtained and a dynamic mechanical analysis showed that it is suitable for the plastolock concept. A simple production test indicated that this material is suitable for prototyping by molding. Overall, the results in this article show that the plastolock concept can offer simple, scalable solutions for medical situations that desire stiffness at one instance and flexibility at another.
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e-mail: a.j.loeve@tudelft.nl
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December 2010
Design Innovations
Polymer Rigidity Control for Endoscopic Shaft-Guide ‘Plastolock’ — A Feasibility Study
Arjo J. Loeve,
Arjo J. Loeve
Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering,
e-mail: a.j.loeve@tudelft.nl
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The Netherlands
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Johannes H. Bosma,
Johannes H. Bosma
Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering,
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The Netherlands
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Paul Breedveld,
Paul Breedveld
Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering,
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The Netherlands
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Dimitra Dodou,
Dimitra Dodou
Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering,
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The Netherlands
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Jenny Dankelman
Jenny Dankelman
Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering,
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The Netherlands
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Arjo J. Loeve
Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering,
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The Netherlandse-mail: a.j.loeve@tudelft.nl
Johannes H. Bosma
Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering,
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The Netherlands
Paul Breedveld
Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering,
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The Netherlands
Dimitra Dodou
Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering,
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The Netherlands
Jenny Dankelman
Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering,
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The NetherlandsJ. Med. Devices. Dec 2010, 4(4): 045001 (6 pages)
Published Online: October 12, 2010
Article history
Received:
May 3, 2010
Revised:
August 12, 2010
Online:
October 12, 2010
Published:
October 12, 2010
Citation
Loeve, A. J., Bosma, J. H., Breedveld, P., Dodou, D., and Dankelman, J. (October 12, 2010). "Polymer Rigidity Control for Endoscopic Shaft-Guide ‘Plastolock’ — A Feasibility Study." ASME. J. Med. Devices. December 2010; 4(4): 045001. https://doi.org/10.1115/1.4002494
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