Design of Reliable Remobilisation Finger Implants with Geometry Elements of a Triple Periodic Minimal Surface Structure via Additive Manufacturing of Silicon Nitride

Christof Koplin (), Eric Schwarzer-Fischer, Eveline Zschippang, Yannick Marian Löw, Martin Czekalla, Arthur Seibel, Anna Rörich, Joachim Georgii, Felix Güttler, Sinef Yarar-Schlickewei and Andreas Kailer
Additional contact information
Christof Koplin: Fraunhofer-Institut für Werkstoffmechanik (IWM), Wöhlerstraße 11, 79108 Freiburg im Breisgau, Germany
Eric Schwarzer-Fischer: Fraunhofer-Institut für Keramische Technologien und Systeme (IKTS), Winterbergstraße 28, 01277 Dresden, Germany
Eveline Zschippang: Fraunhofer-Institut für Keramische Technologien und Systeme (IKTS), Winterbergstraße 28, 01277 Dresden, Germany
Yannick Marian Löw: Fraunhofer-Einrichtung für Additive Produktionstechnologien (IAPT), Am Schleusengraben 14, 21029 Hamburg, Germany
Martin Czekalla: Fraunhofer-Einrichtung für Additive Produktionstechnologien (IAPT), Am Schleusengraben 14, 21029 Hamburg, Germany
Arthur Seibel: Fraunhofer-Einrichtung für Additive Produktionstechnologien (IAPT), Am Schleusengraben 14, 21029 Hamburg, Germany
Anna Rörich: Fraunhofer-Institut für Digitale Medizin (MEVIS), Max-Von-Laue-Straße 2, 28359 Bremen, Germany
Joachim Georgii: Fraunhofer-Institut für Digitale Medizin (MEVIS), Max-Von-Laue-Straße 2, 28359 Bremen, Germany
Felix Güttler: Institut für Diagnostische und Interventionelle Radiologie, University Hospital Jena, Friedrich-Schiller-University, Am Klinikum 1, 07747 Jena, Germany
Sinef Yarar-Schlickewei: Klinik und Poliklinik für Unfallchirurgie und Orthopädie, Universitätsklinikum Hamburg-Eppendorf, 20251 Hamburg, Germany
Andreas Kailer: Fraunhofer-Institut für Werkstoffmechanik (IWM), Wöhlerstraße 11, 79108 Freiburg im Breisgau, Germany

J, 2023, vol. 6, issue 1, 1-18

Abstract: When finger joints become immobile due to an accident during sports or a widespread disease such as rheumatoid arthritis, customised finger joint implants are to be created. In an automated process chain, implants will be produced from ceramic or metallic materials. Artificial intelligence-supported software is used to calculate three-dimensional models of the finger bones from two-dimensional X-ray images. Then, the individual implant design is derived from the finger model and 3D printed. The 3D printing process and the structures used are evaluated via model tests and the final implant design via a reliability calculation in a way to ensure that this is also possible via an AI process in the future. Using additive manufacturing with silicon nitride-based ceramics, model specimens and implants are produced via the lithography-based ceramic vat photopolymerisation process with full geometry or elements of triple periodic minimal surfaces structure. The model specimens are tested experimentally, and the loads are matched with a characteristic strength assuming a Weibull distribution of defects in the volume to generate and match failure probabilities. Calculated fracture forces of the silicon nitride-based ceramic structure was validated by comparison of simulation and tests, and the calculation can be used as a quality index for training of artificial intelligence in the future. The proposed method for individualized finger implant design and manufacturing may allow for correction of potential malpositions of the fingers in the future.

Keywords: remobilisation; additive manufacturing; reliability; AI-based; reconstruction; joint-implant; crack-growth; autogeneration (search for similar items in EconPapers)
JEL-codes: I1 I10 I12 I13 I14 I18 I19 (search for similar items in EconPapers)
Date: 2023
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