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Rashidi, A. (author), Saccher, M. (author), Karuthedath, Cyril Baby (author), Sebastian, Abhilash Thanniyil (author), Savoia, Alessandro Stuart (author), Lavigne, Frederik (author), Stubbe, Frederic (author), Dekker, R. (author), Giagka, Vasiliki (author)
Aluminum Nitride (AlN) Piezoelectric Micromachined Ultrasonic Transducers (PMUTs) are gaining interest for biomedical implant power due to biocompatibility and lowtemperature processing. However, due to the low piezoelectric coefficient of AlN PMUTs, storage capacitors are often used to accumulate ultrasonic power transferred over an extended...
conference paper 2023
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Saccher, M. (author), Schaijk, Rob van (author), Kawasaki, Shinnosuke (author), Klootwijk, Johan H. (author), Rashidi, A. (author), Giagka, Vasiliki (author), Savoia, Alessandro Stuart (author), Dekker, R. (author)
Capacitive Micromachined Ultrasound Transducers (CMUTs) have many advantages compared to other ultrasonic transducer technologies, especially for implantable devices. However, they require a high bias voltage for efficient operation. To eliminate the need for an external bias voltage, a charge storage layer can be embedded in the dielectric....
conference paper 2023
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Saccher, M. (author), Rashidi, A. (author), Savoia, Alessandro Stuart (author), Giagka, Vasiliki (author), Dekker, R. (author)
In the domain of ultrasonically powered biomedical implants, there is an increasing interest in cm-scale ultrasonic receivers (RX). However, when a single-element transducer is used as the RX transducer, an uneven phase distribution across the RX area can significantly reduce the harvestable power. In this paper, we investigate the impact of...
conference paper 2023
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Dekker, H.N.J. (author), Tuinstra, M (author), Baars, W.J. (author), Scarano, F. (author), Ragni, D. (author)
A semi-emperical model is developed, able to capture the aeropropulsive performance characteristics of Over-The-Wing propellers at incidence. The model is based on an hypothesis on the interactions of the propeller- and wing-induced flow fields. Effects of these interactions on the both the thrust and lift are written in a form in which the...
conference paper 2023
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Kawasaki, S. (author), Saccher, M. (author), de Wijs, Willem-Jan (author), van den Brand, Jeroen (author), Dekker, R. (author)
Capacitive micromachined ultrasonic transducers (CMUTs) with a built-in charge layer are known as a pre-charged CMUT. In our prior work, we have shown how to model and characterize the charges inside the pre-charged collapse-mode CMUT and conducted life-time test that showed that the charges trapped inside the dielectric were stable in the order...
conference paper 2023
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Dekker, Bo (author), Schouten, A.C. (author), Scharenborg, O.E. (author)
Silent speech interfaces could enable people who lost the ability to use their voice or gestures to communicate with the external world, e.g., through decoding the person’s brain signals when imagining speech. Only a few and small databases exist that allow for the development and training of brain computer interfaces (BCIs) that can decode...
conference paper 2023
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Dekker, H.N.J. (author), Tuinstra, Marthijn (author), Baars, W.J. (author), Scarano, F. (author), Ragni, D. (author)
conference paper 2023
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Kawasaki, S. (author), Yeh, Jia-Jun (author), Saccher, M. (author), Li, Jian (author), Dekker, R. (author)
The main limitation of acoustic particle separation for microfluidic application is its low sorting efficiency. This is due to the weak coupling of surface acoustic waves (SAWs) into the microchannel. In this work, we demonstrate bulk acoustic wave (BAW) particle sorting using capacitive micromachined ultrasonic transducers (CMUTs) for the first...
conference paper 2022
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de Haas, K. (author), Berkhout, B (author), Dekker, H.R.E. (author), Broere, W. (author)
Determining the scope of (structural) renovation of aging tunnels is a complicated task and modular renovation is becoming increasingly necessary. The COB Tunnel Programme aims at developing the knowledge necessary to renovate these tunnels in a modular fashion, to reduce hindrance as much as possible. Part of this program is the development of...
conference paper 2022
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Saccher, M. (author), Lolla, Sai Sandeep (author), Kawasaki, S. (author), Dekker, R. (author)
Ultrasound (US) has recently gained attention for powering and communication with implantable devices due to its short wavelength and low attenuation. However, beam mis-alignments cause a sharp decrease in the amount of transferred power and quality of communication. This work investigates a telemetry protocol that relies on the difference in...
conference paper 2022
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Kawasaki, S. (author), Subramaniam, Indulakshmi (author), Saccher, M. (author), Dekker, R. (author)
Implantable medical devices are becoming smaller and more deeply implanted in the human body for various applications (i.e., neurostimulation, drug delivery, bone fracture monitoring). Therefore, an efficient ultrasound power transfer link is needed to charge these devices. However, this is challenging because each ultrasound transducer has...
conference paper 2021
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Saccher, M. (author), Kawasaki, S. (author), Dekker, R. (author)
Recently, focused ultrasound has been proposed to power deeply implanted medical devices. Almost exclusively, lead zirconate titanate (PZT) transducers are used to convert acoustic energy into electrical energy. Unfortunately, these lead containing devices cannot be hermetically encapsulated since that would block the ultrasound. We propose the...
conference paper 2021
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Mastrangeli, Massimo (author), Aydogmus, H. (author), Dostanic, M. (author), Motreuil-Ragot, P.A. (author), Revyn, N. (author), de Wagenaar, B. (author), Dekker, R. (author), Sarro, Pasqualina M (author)
Stemming from the convergence of tissue engineering and microfluidics, organ-on-chip (OoC) technology can reproduce in vivo-like dynamic microphysiological environments for tissues in vitro. The possibility afforded by OoC devices of realistic recapitulation of tissue and organ (patho)physiology may hold the key to bridge the current...
conference paper 2021
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Kawasaki, S. (author), Westhoek, Y. (author), Subramaniam, I. (author), Saccher, M. (author), Dekker, R. (author)
Using ultrasound to power deeply implanted biomedical devices is a promising technique due to its low attenuation in body tissue and its short wavelength that allows precise focusing of the energy. Ultrasound energy harvesting conventionally has been done using lead zirconate titanate (PZT) ultrasound transducers, which uses the piezoelectric...
conference paper 2021
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Kawasaki, S. (author), Dijkema, E. (author), Saccher, M. (author), Giagka, Vasiliki (author), Schleipen, J.J.H.B. (author), Dekker, R. (author)
In the bioelectronic medicine field, vagus nerve stimulation (VNS) is a promising technique that is expected to treat numerous inflammatory conditions, in addition to the currently FDA approved treatment for epilepsy, depression and obesity [1]. However, current VNS techniques are still limited in the spatial resolution that they can achieve,...
conference paper 2021
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Dekker, Florine W. (author), Erkin, Z. (author)
Privacy-preserving data aggregation protocols have been researched widely, but usually cannot guarantee correctness of the aggregate if users are malicious. These protocols can be extended with zero-knowledge proofs and commitments to work in the malicious model, but this incurs a significant computational cost on the end users, making adoption...
conference paper 2021
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Bakhshaee Babaroud, N. (author), Dekker, R. (author), Serdijn, W.A. (author), Giagka, Vasiliki (author)
Parylene-C has been used as a substrate and encapsulation material for many implantable medical devices. However, to ensure the flexibility required in some applications, minimize tissue reaction, and protect parylene from degradation in vivo an additional outmost layer of polydimethylsiloxane (PDMS) is desired. In such a scenario, the...
conference paper 2020
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Li, J. (author), Naaborg, Jeroen (author), Louwerse, Marcus (author), Henneken, Vincent (author), Eugeni, Carlo (author), Dekker, R. (author)
Our work presents embedded high-density oxide-nitride-oxide (ONO) trench capacitors for power supply decoupling in the next generation of smart catheters. These millimeter-scale smart catheters are using a novel integration platform, Flex-to-Rigid (F2R). In the F2R platform, various functional modules are fabricated or assembled on thin silicon...
conference paper 2020
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Bakhshaee Babaroud, N. (author), Dekker, R. (author), Serdijn, W.A. (author), Giagka, Vasiliki (author)
Parylene-C has been used as a substrate and encapsulation material for many implantable medical devices. However, to ensure the flexibility required in some applications, minimize tissue reaction, and protect parylene from degradation in vivo an additional outmost layer of polydimethylsiloxane (PDMS) is desired. In such a scenario, the adhesion...
conference paper 2020
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Nanbakhsh, K. (author), Kluba, M.M. (author), Pahl, Barbara (author), Bourgeois, Florian (author), Dekker, R. (author), Serdijn, W.A. (author), Giagka, Vasiliki (author)
Platinum is widely used as the electrode material for implantable devices. Owing to its high biostability and corrosion resistivity, platinum could also be used as the main metallization for tracks in active implants. Towards this goal, in this work we investigate the stability of parylene-coated Pt tracks using passive and active tests. The...
conference paper 2019
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