Investigation into the Hybrid Production of a Superelastic Shape Memory Alloy with Additively Manufactured Structures for Medical Implants
Open Access
- 5 June 2021
- Vol. 14 (11), 3098
- https://doi.org/10.3390/ma14113098
Abstract
The demographic change in and the higher incidence of degenerative bone disease have resulted in an increase in the number of patients with osteoporotic bone tissue causing. amongst other issues, implant loosening. Revision surgery to treat and correct the loosenings should be avoided, because of the additional patient stress and high treatment costs. Shape memory alloys (SMA) can help to increase the anchorage stability of implants due to their superelastic behavior. The present study investigates the potential of hybridizing NiTi SMA sheets with additively manufactured Ti6Al4V anchoring structures using laser powder bed fusion (LPBF) technology to functionalize a pedicle screw. Different scanning strategies are evaluated, aiming for minimized warpage of the NiTi SMA sheet. For biomechanical tests, functional samples were manufactured. A good connection between the additively manufactured Ti6Al4V anchoring structures and NiTi SMA substrate could be observed though crack formation occurring at the transition area between the two materials. These cracks do not propagate during biomechanical testing, nor do they lead to flaking structures. In summary, the hybrid manufacturing of a NiTi SMA substrate with additively manufactured Ti6Al4V structures is suitable for medical implants.Keywords
Funding Information
- Bundesministerium für Bildung und Forschung (036ZZ1026D)
This publication has 18 references indexed in Scilit:
- Biological Cell Investigation of Structured Nitinol Surfaces for the Functionalization of ImplantsMaterials, 2020
- Experimental validation of adaptive pedicle screws-a novel implant concept using shape memory alloysMedical & Biological Engineering & Computing, 2020
- Risk Factors for Clinically Relevant Loosening of Percutaneous Pedicle ScrewsSpine Surgery and Related Research, 2019
- Concept of patient-specific shape memory implants for the treatment of orbital floor fracturesOral and Maxillofacial Surgery, 2017
- Biocompatibility and Inflammatory Potential of Titanium Alloys Cultivated with Human Osteoblasts, Fibroblasts and MacrophagesMaterials, 2017
- Development of Patient-specific Orbital Floor Implants Made of Shape Memory AlloysProcedia CIRP, 2016
- Effect of Annealing on Strain-Temperature Response under Constant Tensile Stress in Cold-Worked NiTi Thin WireSmart Materials Research, 2011
- Prevalence of osteoporosis in patients requiring spine surgery: incidence and significance of osteoporosis in spine diseaseOsteoporosis International, 2007
- Biomechanical study of pedicle screw fixation in severely osteoporotic bone*1The Spine Journal, 2004
- Optimisation of processing and properties of medical grade Nitinol wireMinimally Invasive Therapy & Allied Technologies, 2000