Feasibility of a Shape-Memory-Alloy-Actuator System for Modular Acetabular Cups

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Christian Rotsch - , Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik, Universitätsklinikum Leipzig (Autor:in)
  • Karoline Kemter-Esser - , Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik (Autor:in)
  • Johanna Dohndorf - , Professur für Biomedizinische Technik, Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik (Autor:in)
  • Marcel Knothe - , IMA Materialforschung und Anwendungstechnik GmbH (Autor:in)
  • Welf-Guntram Drossel - , Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik, Technische Universität Chemnitz (Autor:in)
  • Christoph-Eckhardt Heyde - , Universitätsklinikum Leipzig (Autor:in)

Abstract

Hip implants have a modular structure which enables patient-specific adaptation but also revision of worn or damaged friction partners without compromising the implant-bone connection. To reduce complications during the extraction of ceramic inlays, this work presents a new approach of a shape-memory-alloy-actuator which enables the loosening of ceramic inlays from acetabular hip cups without ceramic chipping or damaging the metal cup. This technical in vitro study exam-ines two principles of heating currents and hot water for thermal activation of the shape-memory-alloy-actuator to generate a force between the metal cup and the ceramic inlay. Mechanical tests concerning push-in and push-out forces, deformation of the acetabular cup according to international test standards, and force generated by the actuator were generated to prove the feasibility of this new approach to ceramic inlay revision. The required disassembly force for a modular acetabular device achieved an average value of 602 N after static and 713 N after cyclic loading. The actuator can provide a push-out force up to 1951 N. In addition, it is shown that the necessary modifications to the implant modules for the implementation of the shape-memory-actuator-system do not result in any change in the mechanical properties compared to conventional systems.

Details

OriginalspracheEnglisch
Aufsatznummer75
FachzeitschriftBioengineering
Jahrgang11
Ausgabenummer1
PublikationsstatusVeröffentlicht - 12 Jan. 2024
Peer-Review-StatusJa

Externe IDs

ORCID /0009-0008-0416-6442/work/150881727
Scopus 85183099109
PubMed 38247952

Schlagworte

Schlagwörter

  • shape memory alloy, Nitinol, NiTi, SMA, implant, hip implant, acetabular cup, extraction, implant revision