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Interconnection technologies for laser-patterned electrode arrays.

Martin Schuettler1, Christian Henle, Juan S Ordonez

  • 1Laboratory for Biomedical Microtechnology, Department of Microsystems Engineering, University of Freiburg, Germany. schuettler@imtek.de

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|January 24, 2009
PubMed
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Soldering offers the strongest mechanical connections for laser-patterned nerve electrodes. If soldering is not feasible, parallel gap welding and microflex bonding are recommended alternatives for reliable electrode interconnection.

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Electrical Engineering

Background:

  • Developing reliable interconnections for neural electrodes is crucial for advanced neuroprosthetics and research.
  • Laser-patterned electrodes from silicone rubber and platinum foil require robust methods for electrical and mechanical connection.
  • Screen-printed alumina substrates are commonly used in neural interface designs.

Purpose of the Study:

  • To evaluate standard interconnection technologies for laser-patterned nerve electrodes.
  • To determine the mechanical strength and reliability of different connection methods.
  • To provide recommendations for optimal electrode-substrate connectivity.

Main Methods:

  • Investigated laser welding, gap welding, microflex ball bonding, and soldering techniques.

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  • Established and optimized processes for each interconnection method.
  • Assessed the mechanical strength of the resulting interconnects.

    • Main Results:

    • Soldering demonstrated the highest mechanical strength for connecting nerve electrodes.
    • Parallel gap welding and microflex bonding yielded acceptable results, suitable when soldering is restricted.
    • Laser welding resulted in weaker interconnects with moderate reproducibility.

    Conclusions:

    • Soldering is the preferred method for robust interconnection of laser-patterned nerve electrodes.
    • Parallel gap welding and microflex bonding serve as viable alternatives under specific constraints.
    • Careful selection of interconnection technology is vital for the performance and longevity of neural interfaces.