Ultrasonically powered piezoelectric generators for bio-implantable sensors: Plate versus diaphragm

Christensen, David; Roundy, Shad

doi:10.1177/1045389x15585897

Cited by 33 publications

(24 citation statements)

References 17 publications

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“…The pMUT seems to generate slightly more voltage and power at any depth compared to the COTS device. This is in agreement with the numerical results published in [21] in which a diaphragm structure at about 4 mm 2 size scale would generate slightly higher power numbers compared to a plate structure with the same size at depths higher than 20 mm when a same acoustic input is applied.…”

Section: Generated Power and Sensitivity Comparisonsupporting

confidence: 92%

Acoustic power transfer for biomedical implants using piezoelectric receivers: effects of misalignment and misorientation

Basaeri

Young

et al. 2019

J. Micromech. Microeng.

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Implantable medical devices (IMDs) can be powered wirelessly using acoustics with no need for a battery. In an acoustic power transfer system, which consists of a transmitter, medium, and a receiver, the power that the receiver generates is a function of its position (depth, orientation, and alignment relative to the transmitter). The power delivered to the implant should remain stable and reliable even with possible uncertainties in the location of the implant. In this paper, we compare two common designs for piezoelectric ultrasonic transducers that can be used for acoustically powering IMDs, and study their generated power sensitivity to any change in their location. Although commercial off-the-shelf (COTS) transducers are widely being used in the literature, they may not be the best candidate for powering small implants since they may not be able to provide sufficient power in the presence of location uncertainties. Piezoelectric micromachined ultrasonic transducers (pMUTs) are diaphragm structures and are also suitable for wirelessly powering implants. We present a pMUT receiver and study the sensitivity of the generated power of the pMUT to changes in its position. We then perform a comparative study between power generation capability of our pMUT and a COTS transducer with the same lateral dimensions as the pMUT. We observed that the generated power from a pMUT structure is less sensitive to misorientation and misalignment of the device. The average percentage improvement in the generated power from pMUT compared to COTS are 86%, 917%, and 111% for depth, alignment, and orientation, respectively.

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Section: Generated Power and Sensitivity Comparisonsupporting

confidence: 92%

Acoustic power transfer for biomedical implants using piezoelectric receivers: effects of misalignment and misorientation

Basaeri

Young

et al. 2019

J. Micromech. Microeng.

Self Cite

View full text Add to dashboard Cite

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“…This technology has received growing interest in the past years [ 56 , 57 , 58 , 59 ] due to its advantages compared with other technologies in efficiency, size and immunity to electromagnetic radiation from other devices [ 60 ]. The ultrasonic transducer is excited mechanically by an external ultrasound source using an ultrasonic transducer which can operate through capacitance mode or piezoelectric mode [ 122 , 123 ]. The implanted ultrasonic generator produces power from a received acoustic wave transmitted by an external unit.…”

Section: Methods To Power Imdsmentioning

confidence: 99%

Power Approaches for Implantable Medical Devices

Amar

Kouki

Cao

2015

Sensors

350

215

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Implantable medical devices have been implemented to provide treatment and to assess in vivo physiological information in humans as well as animal models for medical diagnosis and prognosis, therapeutic applications and biological science studies. The advances of micro/nanotechnology dovetailed with novel biomaterials have further enhanced biocompatibility, sensitivity, longevity and reliability in newly-emerged low-cost and compact devices. Close-loop systems with both sensing and treatment functions have also been developed to provide point-of-care and personalized medicine. Nevertheless, one of the remaining challenges is whether power can be supplied sufficiently and continuously for the operation of the entire system. This issue is becoming more and more critical to the increasing need of power for wireless communication in implanted devices towards the future healthcare infrastructure, namely mobile health (m-Health). In this review paper, methodologies to transfer and harvest energy in implantable medical devices are introduced and discussed to highlight the uses and significances of various potential power sources.

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“…Acoustic power transfer (APT), a non-EM WPT technique, is the leading competitor against NRIC and NRMRC in terms of PTE performance [191,192]. In the APT technique, energy is wirelessly propagated using ultrasound waves at carrier frequencies above 20 kHz without interfering with EM waves [193].…”

Section: Link Designmentioning

confidence: 99%

Wireless Power Transfer Techniques for Implantable Medical Devices: A Review

Khan

Pavuluri

Cummins

et al. 2020

Sensors

220

109

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Wireless power transfer (WPT) systems have become increasingly suitable solutions for the electrical powering of advanced multifunctional micro-electronic devices such as those found in current biomedical implants. The design and implementation of high power transfer efficiency WPT systems are, however, challenging. The size of the WPT system, the separation distance between the outside environment and location of the implanted medical device inside the body, the operating frequency and tissue safety due to power dissipation are key parameters to consider in the design of WPT systems. This article provides a systematic review of the wide range of WPT systems that have been investigated over the last two decades to improve overall system performance. The various strategies implemented to transfer wireless power in implantable medical devices (IMDs) were reviewed, which includes capacitive coupling, inductive coupling, magnetic resonance coupling and, more recently, acoustic and optical powering methods. The strengths and limitations of all these techniques are benchmarked against each other and particular emphasis is placed on comparing the implanted receiver size, the WPT distance, power transfer efficiency and tissue safety presented by the resulting systems. Necessary improvements and trends of each WPT techniques are also indicated per specific IMD.

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Ultrasonically powered piezoelectric generators for bio-implantable sensors: Plate versus diaphragm

Cited by 33 publications

References 17 publications

Acoustic power transfer for biomedical implants using piezoelectric receivers: effects of misalignment and misorientation

Acoustic power transfer for biomedical implants using piezoelectric receivers: effects of misalignment and misorientation

Power Approaches for Implantable Medical Devices

Wireless Power Transfer Techniques for Implantable Medical Devices: A Review

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