Current keyhole biopsy devices are rather ungainly, inaccurate, and limited in application. A keyhole biopsy harvester was designed to facilitate peripheral cancerous tissue detection and resection at high speed and accuracy. The harvester's cutting tool, the crown-cutter, was bioinspired by the sea urchin's chewing organ—Aristotle's lantern. This paper focuses on the optimization of the crown-cutter with regard to the impact of different tooth quantity and bevel type on tissue deformation, penetration forces, and tooth collapsibility. Two sets of crown-cutter designs were manufactured and tested in push-in experiments using gelatin—the first set having no bevel and differing tooth quantity (4, 6, 8, 10 teeth) and the second set of constant tooth quantity and differing bevel type (no, inner, outer, and inner and outer bevel). The gelatin surface deformation and the penetration forces were evaluated utilizing a high speed camera and a universal testing machine, respectively. The experimental results on the crown-cutters of different tooth quantity (no bevel) showed a steady increase in the tissue deformation with the increasing amount of teeth. Unlike the bevel type, the different tooth quantity revealed significant differences with regard to the tissue deformation in between 4 versus 6-teeth and 10 versus 6-teeth cutters. As for the penetration forces, the significant difference was found only between 10 and 6-teeth cutters. In conclusion, reducing the cutter's tooth quantity resulted in lower tissue deformation, whereas differing the bevel type was found to have a negligible influence. Ultimately, a high ratio of outward to inward tooth collapsibility and a relatively low inner moment of inertia proved the 6-teeth cutter to be the most optimal.
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December 2014
Research-Article
Bioinspired Crown-Cutter—The Impact of Tooth Quantity and Bevel Type on Tissue Deformation, Penetration Forces, and Tooth Collapsibility
Filip Jelínek,
Filip Jelínek
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: F.Jelinek@tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: F.Jelinek@tudelft.nl
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Jeffrey Goderie,
Jeffrey Goderie
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: C.J.M.Goderie@student.tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: C.J.M.Goderie@student.tudelft.nl
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Alice van Rixel,
Alice van Rixel
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: A.M.E.vanRixel@student.tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: A.M.E.vanRixel@student.tudelft.nl
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Daan Stam,
Daan Stam
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: I.D.Stam@student.tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: I.D.Stam@student.tudelft.nl
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Johan Zenhorst,
Johan Zenhorst
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: J.Zenhorst@student.tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: J.Zenhorst@student.tudelft.nl
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Paul Breedveld
Paul Breedveld
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: P.Breedveld@tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: P.Breedveld@tudelft.nl
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Filip Jelínek
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: F.Jelinek@tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: F.Jelinek@tudelft.nl
Jeffrey Goderie
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: C.J.M.Goderie@student.tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: C.J.M.Goderie@student.tudelft.nl
Alice van Rixel
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: A.M.E.vanRixel@student.tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: A.M.E.vanRixel@student.tudelft.nl
Daan Stam
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: I.D.Stam@student.tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: I.D.Stam@student.tudelft.nl
Johan Zenhorst
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: J.Zenhorst@student.tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: J.Zenhorst@student.tudelft.nl
Paul Breedveld
BioMechanical Engineering Department,
Faculty Mechanical, Maritime and
Materials Engineering,
e-mail: P.Breedveld@tudelft.nl
Faculty Mechanical, Maritime and
Materials Engineering,
Delft University of Technology
,Mekelweg 2, Delft 2628 CD
, Netherlands
e-mail: P.Breedveld@tudelft.nl
Manuscript received November 28, 2013; final manuscript received March 3, 2014; published online xx xx, xxxx. Assoc. Editor: Rafael V. Davalos.
J. Med. Devices. Dec 2014, 8(4): 041009 (6 pages)
Published Online: August 19, 2014
Article history
Received:
November 28, 2013
Revision Received:
March 3, 2014
Citation
Jelínek, F., Goderie, J., van Rixel, A., Stam, D., Zenhorst, J., and Breedveld, P. (August 19, 2014). "Bioinspired Crown-Cutter—The Impact of Tooth Quantity and Bevel Type on Tissue Deformation, Penetration Forces, and Tooth Collapsibility." ASME. J. Med. Devices. December 2014; 8(4): 041009. https://doi.org/10.1115/1.4027054
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