ir. A.I. Velea

PhD student
Bioelectronics (BE), Department of Microelectronics

Expertise: Microfabrication of flexible implantable devices, Ultrasound and electrical stimulation for active neural implants

Themes: Health and Wellbeing

Biography

Andrada Velea was born in Timisoara, Romania in 1994. She received her BSc degree in Electronics and Telecommunications, in 2017, from the Polytechnic University of Timisoara and then moved to Delft, The Netherlands to pursue her MSc studies. She joined the Bioelectronics group at the beginning of 2019 when she started working for her thesis project on graphene-based implantable devices. Later, in December 2019 she obtained her MSc degree (cum laude) in Biomedical Engineering. Still part of the Bioelectronics group, she is currently working towards obtaining her PhD degree while focusing on the investigation and development of active neural implants using ultrasound and electricity as a means of stimulation.

Publications

  1. UV and IR laser-patterning for high-density thin-film neural interfaces,” in Proc.
    Andrada Velea; Joshua Wilson; Anna Pak; Manuel Seckel; Sven Schmidt; Stefan Kosmider; Nasim Bakhshaee; Wouter Serdijn; Vasiliki Giagka;
    In IEEE European Microelectronics and Packaging Conference (EMPC) 2021,
    Online, September 2021.
    document

  2. Soft, flexible and transparent graphene-based active spinal cord implants for optogenetic studies
    A. Velea; S. Vollebregt; Vasiliki Giagka;
    13th International Symposium on Flexible Organic Electronics (ISFOE20),
    2020. Scientific Poster.
    document

  3. Wafer-scale Graphene-based Soft Implant with Optogenetic Compatibility
    A.I. Velea; S. Vollebregt; G.K. Wardhana; V. Giagka;
    In Proc. IEEE Microelectromech. Syst. (MEMS) 2020,
    Vancouver, Canada, IEEE, Jan. 2020.
    document

  4. Wafer-scale Graphene-based Soft Implant with Optogenetic Compatibility
    Andrade Velea; Sten Vollebregt; Gandhika Wardhana; Vasso Giagka;
    In IEEE Int. Conf. on Micro Electro Mechanical Systems (MEMS 2020),
    2020.

  5. Soft, flexible and transparent graphene-based active spinal cord implants for optogenetic studies
    A. Velea; S. Vollebregt; V. Giagka;
    In proc. 13th International Symposium on Flexible Organic Electronics (ISFOE20) 2020,
    Thessaloniki, Greece, July 2020.
    document

  6. Flexible, graphene-based active implant for spinal cord stimulation in rodents
    A.I. Velea; S. Vollebregt; V. Giagka;
    In Book of Abstracts, SAFE 2019,
    Delft, the Netherlands, July 4-5 2019.
    document

  7. Towards a Microfabricated Flexible Graphene-Based Active Implant for Tissue Monitoring During Optogenetic Spinal Cord Stimulation
    A.I. Velea; S. Vollebregt; V. Giagka;
    In Book of Abstracts, IEEE Nanotech. Mater. Dev. Conf. (NMDC) 2019,
    Stockholm, Sweden, IEEE, Oct. 2019.
    Abstract: ... Our aim is to develop a smart neural interface with transparent electrodes to allow for electrical monitoring of the site of interest during optogenetic stimulation of the spinal cord. In this work, we present the microfabrication process for the wafer-level development of such a compact, active, transparent and flexible implant. The transparent, passive array of electrodes and tracks have been developed using graphene, on top of which chips have been bonded using flip-chip bonding techniques. To provide high flexibility, soft encapsulation, using polydimethylsiloxane (PDMS) has been used. Preliminary measurements after the bonding process have shown resistance values in the range of kΩ for the combined tracks and ball-bonds.

    document

  8. Towards a Microfabricated Flexible Graphene-Based Active Implant for Tissue Monitoring During Optogenetic Spinal Cord Stimulation
    A.I. Velea; S. Vollebregt; T. Hosman; A. Pak; V. Giagka;
    In Proceedings IEEE Nanotechnology Materials and Devices Conference (NMDC) 2019,
    Stockholm, Sweden, Oct. 2019.
    Abstract: ... This work aims to develop a smart neural interface with transparent electrodes to allow for electrical monitoring of the site of interest during optogenetic stimulation of the spinal cord. In this paper, a microfabrication process for the wafer-level development of such a compact, active, transparent and flexible implant is presented. Graphene has been employed to form the transparent array of electrodes and tracks, on top of which chips have been bonded using flip-chip bonding techniques. To provide high flexibility, soft encapsulation, using polydimethylsiloxane (PDMS) has been used. Making use of the "Flex-to-Rigid" (F2R) technique, cm-size graphene-on-PDMS structures have been suspended and characterized using Raman spectroscopy to qualitatively evaluate the graphene layer, together with 2-point measurements to ensure the conductivity of the structure. In parallel, flip-chip bonding processes of chips on graphene structures were employed and the 2-point electrical measurement results have shown resistance values in the range of kΩ for the combined tracks and ball-bonds.

    document

  9. Flexible, graphene-based acive implant for spinal cord stimulation in rodents
    Andrada Velea; Sten Vollebregt; Vasiliki Giagka;
    In SAFE/ProRISC,
    2019.

  10. Towards a Microfabricated Flexible Graphene-Based Active Implant for Tissue Monitoring During Optogenetic Spinal Cord Stimulation
    Andrada Iulia Velea; Sten Vollebregt; Tim Hosman; Anna Pak; Vasiliki Giagka;
    In Proc. IEEE NMDC,
    2019.

BibTeX support

Last updated: 26 Feb 2020

Andrada Velea