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Laser bonded microjoints between titanium and polyimide for applications in medical implants

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Abstract

Bioencapsulation of medical implant devices, and neural implant devices in particular, requires development of reliable hermetic joints between packaging materials that are often dissimilar. Titanium-polyimide is one of the biocompatible material systems, which are of interest to our research groups at Wayne State University and Fraunhofer USA. We have found processing conditions for successful joining of titanium with polyimide using near-infrared diode lasers or fiber lasers along transmission bonding lines with widths ranging from 200 to 300 μm. Laser powers of 2.2 and 3.8 W were used to create these joints. Laser-joined samples were tested in a microtester under tensile loading to determine joint strengths. In addition, finite element analysis (FEA) was conducted to understand the stress distribution within the bond area under tensile loading. The FEA model provides a full-field stress distribution in and around the joint that cause eventual failure. Results from the investigation provide an initial approach to characterize laser-fabricated microjoints between dissimilar materials that can be potentially used in optimization of bio-encapsulation design.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Wayne State University, Detroit, Michigan, USA

    A. Mian, G. Newaz, L. Vendra & N. Rahman

  2. Center for Smart Sensors and Integrated Microsystems (SSIM), Wayne State University, Detroit, Michigan, USA

    G. Newaz, D. G. Georgiev & G. Auner

  3. Institute for Manufacturing Research, Wayne State University, Detroit, Michigan, USA

    G. Newaz

  4. Center for Laser Technology, Fraunhofer USA, Plymouth, Michigan, USA

    R. Witte & H. Herfurth

Authors
  1. A. Mian
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  2. G. Newaz
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  3. L. Vendra
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  4. N. Rahman
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  5. D. G. Georgiev
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  6. G. Auner
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  7. R. Witte
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  8. H. Herfurth
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Correspondence to G. Newaz.

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Mian, A., Newaz, G., Vendra, L. et al. Laser bonded microjoints between titanium and polyimide for applications in medical implants. J Mater Sci: Mater Med 16, 229–237 (2005). https://doi.org/10.1007/s10856-005-6684-1

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  • DOI: https://doi.org/10.1007/s10856-005-6684-1

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