Smart 4D-printed implants and instruments
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Author (Corporation)
Publication date
09.2020
Typ of student thesis
Course of study
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
Current Directions in Biomedical Engineering
Special issue
DOI of the original publication
Link
Series
Series number
Volume
6
Issue / Number
3
Pages / Duration
209-212
Patent number
Publisher / Publishing institution
De Gruyter
Place of publication / Event location
Edition
Version
Programming language
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Practice partner / Client
Abstract
Selective laser melting (SLM) was used to manufacture smart programmed structures with customized properties made of biocompatible NiTi shape-memory alloy. A series of helixes was produced with systematically varied SLM process parameters Laser Exposure Time and Laser Power in order to specifically change the thermo-mechanical material properties of the 3D-structures. This innovation opens up the possibility to adjust the NiTi phase transformation temperature during the manufacturing process. This controllable property determines which of the two crystallographic phases martensite or austenite is present at a certain operating temperature and allows the mechanical properties to be adjusted: martensitic devices are soft and pseudo-plastic due to the shape-memory effect, whereas austenitic structures are pseudo-elastic. In a further step, the SLM process parameters were locally varied within 4D-printed twin-helixes. As a result, the phases, respectively the mechanical properties of a single component were adjusted at different locations. The ratio of elastic to plastic deformation and the spring constant of the helix can be locally controlled. This allows, for example, the spatio-temporal programming of 3D-printed surgical instruments or implants that are stimuli-responsive.
Keywords
4D printing, smart tools, Selective Laser Melting, NiTi, transformation temperature
Subject (DDC)
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ISBN
ISSN
2364-5504
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
No peer review
Open access category
License
Citation
de Wild, M., & Schuler, F. (2020). Smart 4D-printed implants and instruments. Current Directions in Biomedical Engineering, 6(3), 209–212. https://doi.org/10.1515/cdbme-2020-3053