Flexible impulse transfer using a Newton's Cradle-inspired catheter

A feasibility study

Journal Article (2019)
Author(s)

Aimée Sakes (TU Delft - Medical Instruments & Bio-Inspired Technology)

Leander Grandia (Student TU Delft)

Remie Lether (Student TU Delft)

Lukas Steenstra (Student TU Delft)

Maurice C. Valentijn (Student TU Delft)

P Breedveld (TU Delft - Medical Instruments & Bio-Inspired Technology)

Jo W. Spronck (TU Delft - Mechatronic Systems Design)

Research Group
Medical Instruments & Bio-Inspired Technology
Copyright
© 2019 A. Sakes, Leander Grandia, Remie Lether, Lukas Steenstra, Maurice C. Valentijn, P. Breedveld, J.W. Spronck
DOI related publication
https://doi.org/10.1016/j.medengphy.2018.12.025
More Info
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Publication Year
2019
Language
English
Copyright
© 2019 A. Sakes, Leander Grandia, Remie Lether, Lukas Steenstra, Maurice C. Valentijn, P. Breedveld, J.W. Spronck
Research Group
Medical Instruments & Bio-Inspired Technology
Volume number
67
Pages (from-to)
88-95
Reuse Rights

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Abstract

A major challenge during minimally invasive surgery is transfer of high forces through small, flexible instruments, such as needles and catheters, because of their low buckling resistance. In this study, we determined the feasibility of using a Newton's Cradle-inspired catheter (patented) to transfer high-force impulses. Exerting a high-force impulse on the tissue increases the critical buckling load and can prevent buckling. The system comprised an input plunger onto which the impulse is given, a (flexible) shaft filled with Ø2 mm stainless steel balls, and an output plunger to transfer the impulse to the target tissue. In the proof-of-principle experiment, the effect on efficiency of clearance (0.1, 0.2, and 0.3 mm), length (100, 200, and 300 mm), shaft type (rigid vs. flexible), curve angle (0, 45, 90, 135, and 180°), and curve radius (20, 40, 60, and 100 mm) was determined. The catheter delivered forces of 6 N without buckling. The average impulse efficiency of the system was 35%, which can be further increased by optimizing the design. This technology is promising for high-force delivery in miniature medical devices during minimally invasive surgery.

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