A microwatt telemetry protocol for targeting deep implants

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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 limited angular sensitivity. This work proposes a low-power telemetry protocol that can reliably feedback the power sent to the implant with backscattered ultrasound. The protocol works by sending two consecutive interrogation signals and connecting a circuit on the receiver that modulates only one of the two signals. The modulated signal can be decoded with an external ultrasound probe. In this work, the circuit was built, verified, and compared with simulation results. It was shown that the telemetry protocol could accurately localize the receiving ultrasound element at sub-mm precision at a 10 cm depth.
Original languageEnglish
Title of host publication2021 IEEE International Ultrasonics Symposium (IUS)
Subtitle of host publicationProceedings
Place of PublicationPiscataway
Number of pages4
ISBN (Electronic)978-1-6654-0355-9
ISBN (Print)978-1-6654-4777-5
Publication statusPublished - 2021
Event2021 IEEE International Ultrasonics Symposium (IUS) - Virtual at Xi'an, China
Duration: 11 Sep 202116 Sep 2021


Conference2021 IEEE International Ultrasonics Symposium (IUS)
Abbreviated titleIUS 2021
CityVirtual at Xi'an

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • pre-charged CMUT
  • backscattering
  • ultrasound power transfer
  • implantable medical device


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