Schweizer S.,University of Basel |
Schuster T.,University of Basel |
Junginger M.,University of Potsdam |
Junginger M.,Max Planck Institute of Colloids and Interfaces |
And 4 more authors.
Macromolecular Materials and Engineering | Year: 2010
The report shows that simple LbL deposition of positively charged chitosan and negatively charged heparin can be used to efficiently modify the native surface of both NiTi and Ti without any previous treatments. Moreover, mineralization of the polymer multilayers with calcium phosphate leads to surfaces with low contact angles around 70 and 20° for NiTi and Ti, respectively. This suggests that a polymer multilayer/calcium phosphate hybrid coating could be useful for making NiTi or Ti implants that are at the same time antibacterial (via the chitosan), suppress blood clot formation (via the heparin), and favor fast endothelialization (via the improved surface hydrophilicity compared to the respective neat material). © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source
Rahim M.,Ruhr University Bochum |
Frenzel J.,Ruhr University Bochum |
Frotscher M.,Ruhr University Bochum |
Frotscher M.,Cortronik GmbH |
And 5 more authors.
Acta Materialia | Year: 2013
In the present work we show how different oxygen (O) and carbon (C) levels affect fatigue lives of pseudoelastic NiTi shape memory alloys. We compare three alloys, one with an ultrahigh purity and two which contain the maximum accepted levels of C and O. We use bending rotation fatigue (up to cycle numbers >108) and scanning electron microscopy (for investigating microstructural details of crack initiation and growth) to study fatigue behavior. High cycle fatigue (HCF) life is governed by the number of cycles required for crack initiation. In the low cycle fatigue (LCF) regime, the high-purity alloy outperforms the materials with higher number densities of carbides and oxides. In the HCF regime, on the other hand, the high-purity and C-containing alloys show higher fatigue lives than the alloy with oxide particles. There is high experimental scatter in the HCF regime where fatigue cracks preferentially nucleate at particle/void assemblies (PVAs) which form during processing. Cyclic crack growth follows the Paris law and does not depend on impurity levels. The results presented in the present work contribute to a better understanding of structural fatigue of pseudoelastic NiTi shape memory alloys. © 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Source
Admedes Schuessler GmbH | Date: 2013-01-22
The invention relates to a method for producing a body implant comprising the steps of: providing a wire; producing predetermined cuts of the cross section of the wire by means of an ultrashort pulse laser in order to produce a predetermined shape of the body implant. This method can be used to produce, for example, a body implant, an assembly consisting of a guide wire and a body implant, or a medical instrument having a guide wire.
Admedes Schuessler GmbH | Date: 2013-08-16
Euroflex, Germany, announces that its parent company, G. Rau Group, has acquired the remaining shares of Admedes Schuessler GmbH from the co-founder Dr. Andreas Schüssler, making the G. Rau Group the sole owner. Up to now, G. Rau has been the majority shareholder of Admedes, a component supplier for the medical industry. Admedes management will be taken over by Dr. Axel Pfrommer (CEO) and Frank Nauheimer (CFO). Thus the management will be run now by an experienced executive team. Both managers have the full confidence of the G.Rau shareholders. Dr. Andreas Schüssler will stay connected with Admedes as the Chairman of the Technology Advisory Board, and Admedes will stay independent as a subsidiary company within the G. Rau Group. But from now on, there will be a well positioned group of companies with a stable financial background standing by side by side.