Midfield Wireless Power Transfer for Bioelectronics

Ma, Adrian; Poon, Ada S. Y.

doi:10.1109/mcas.2015.2418999

Cited by 54 publications

(20 citation statements)

References 32 publications

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“…Previously, frequencies at the MHz range were considered optimal for implantable devices to minimize device dielectric loss in tissue [41]. Mid-field powering method developed in [41][42][43] shows that frequencies in the low GHz range is optimal for powering up mm-scale devices embedded in body. Since our RFID is much smaller, it is worth examining what the optimal operating frequency should be.…”

Section: A Frequency Dependencymentioning

confidence: 99%

Micrometer-Scale Magnetic-Resonance-Coupled Radio-Frequency Identification and Transceivers for Wireless Sensors in Cells

Aggarwal

Yang

et al. 2017

Phys. Rev. Applied

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We report the design, analysis and characterization of a three-inductor radio-frequency identification (RFID) and transceiver (TRX) system for potential applications in individual cell tracking and monitoring. The RFID diameter is 22 µm and can be naturally internalized by living cells. Using magnetic resonant coupling, the system shows resonance shifts when the RFID is present and also when the RFID loading capacitance changes. It operates at 60 GHz with a high signal magnitude up to −50 dB and a sensitivity of 0.25. This miniaturized RFID with a high signal magnitude is a promising step toward continuous, real-time monitoring of activities at cellular levels.

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Section: A Frequency Dependencymentioning

confidence: 99%

Micrometer-Scale Magnetic-Resonance-Coupled Radio-Frequency Identification and Transceivers for Wireless Sensors in Cells

Aggarwal

Yang

et al. 2017

Phys. Rev. Applied

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“…On the other hand, essentially all implantable devices require a common component: a power supply, which is usually a battery. Recent advances in wireless power transfer (WPT) provide an alternative method to power implantable electronic devices [1][2][3]. The WPT technology not only eliminates the needs of repeated surgical replacements of a depleted battery within the human body, but also reduces the size of the implant, simplifies the implantation procedure, and enables the device to be placed in restricted anatomic locations prohibitive to large implants.…”

Section: Introductionmentioning

confidence: 99%

Wireless Power Transfer for Miniature Implantable Biomedical Devices

Xu¹,

Wang²,

Mao³

et al. 2020

Recent Wireless Power Transfer Technologies

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Miniature implantable electronic devices play increasing roles in modern medicine. In order to implement these devices successfully, the wireless power transfer (WPT) technology is often utilized because it provides an alternative to the battery as the energy source; reduces the size of implant substantially; allows the implant to be placed in a restricted space within the body; reduces both medical cost and chances of complications; and eliminates repeated surgeries for battery replacements. In this work, we present our recent studies on WPT for miniature implants. First, a new implantable coil with a double helix winding is developed which adapts to tubularly shaped organs within the human body, such as blood vessels and nerves. This coil can be made in the planar form and then wrapped around the tubular organ, greatly simplifying the surgical procedure for device implantation. Second, in order to support a variety of experiments (e.g., drug evaluation) using a rodent animal model, we present a special WPT transceiver system with a relatively large power transmitter and a miniature implantable power receiver. We present a multi-coil design that allows steady power transfer from the floor of an animal cage to the bodies of a group of free-moving laboratory rodents.

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“…Implantable devices with wireless connectivity has led to many advances in the field of biomedical applications, as they allow long term powering of devices within the human body [1][2][3][4][5][6]. The principal power required by the medical implants such as cochlear implants, retinal prostheses, pacemakers, and neural recordings are different [7][8][9] and therefore powering these devices without damaging the tissues remain an arduous challenge.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Specific Absorption Rate in Three-Layered Tissue Model at 13.56 MHz and 40.68 MHz for Inductively Powered Biomedical Implants

Mohanarangam¹,

Palagani²,

Choi³

2019

Applied Sciences

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This paper presents an optimized 3-coil inductive wireless power transfer (WPT) system at 13.56 MHz and 40.68 MHz to show and compare the specific absorption rate (SAR) effects on human tissue. This work also substantiates the effects of perfect alignment, lateral and/or angular misalignments on the power transfer efficiency (PTE) of the proposed WPT system. Additionally, the impacts of different tissue composition, input power and coil shape on the SAR are analyzed. The distance between the external and implantable coils is 10 mm. The results have been verified through simulations and measurements. The simulated results show that the SAR of the system at 40.68 MHz had crossed the limit designated by the Federal Communications Commission and hence, it is unsafe and causes tissue damage. Measurement results of the system in air medium show that the optimized printed circuit board coils at 13.56 MHz achieved a PTE of 41.7% whereas PTE waned to 18.2% and 15.4% at 10 mm of lateral misalignment and 60° of angular misalignment respectively. The PTE of a combination of 10 mm lateral misalignment and 60° angular misalignment is 21%. To analyze in a real-environment, a boneless pork sample with 10 mm of thickness is placed as a medium between the external and implantable coils. At perfect alignment, the PTE through pork sample is 30.8%. A RF power generator operating at 13.56 MHz provides 1 W input power to the external coil and the power delivered to load through the air and tissue mediums are 347 mW and 266 mW respectively.

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Midfield Wireless Power Transfer for Bioelectronics

Cited by 54 publications

References 32 publications

Micrometer-Scale Magnetic-Resonance-Coupled Radio-Frequency Identification and Transceivers for Wireless Sensors in Cells

Micrometer-Scale Magnetic-Resonance-Coupled Radio-Frequency Identification and Transceivers for Wireless Sensors in Cells

Wireless Power Transfer for Miniature Implantable Biomedical Devices

Evaluation of Specific Absorption Rate in Three-Layered Tissue Model at 13.56 MHz and 40.68 MHz for Inductively Powered Biomedical Implants

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