Midfield Wireless Power Transfer for Deep-Tissue Biomedical Implants

Nguyen, Ngan; Ha‐Van, Nam; Seo, Chulhun

doi:10.1109/lawp.2020.3029848

Cited by 39 publications

(12 citation statements)

References 14 publications

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“…From their measurement results, the system can deliver 6.7 mW power for deep tissue implants over 5 cm, which shows great potential of powering the cardiovascular implants. Subsequently, Nguyen et al [184] reported a compact mid-field Tx configuration to power miniature implants, as presented in Figure 7E-a,b,c. A planar PIFA type antenna with a Z-shaped slot (on the ground layer) and three short pins was used for the Rx (with a size of 9 × 13 mm 2 ) to achieve the maximum gain value.…”

Section: Mid-field Wptmentioning

confidence: 99%

Battery‐Free and Wireless Technologies for Cardiovascular Implantable Medical Devices

Zhang

Das

Zhao

et al. 2022

Adv Materials Technologies

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Cardiovascular disease continues to be one of the dominant causes of global mortality. One effective treatment is to utilize cardiovascular implantable devices (cIMDs) with multi‐functional cell sensing and monitoring features that have the potential to manipulate cardiovascular hyperplasia disorders as well as provide therapy. However, batteries with a fixed capacity entail high‐risk surgeries for battery‐replacement, which causes health hazards and imposes significant costs to patients. This review accesses comprehensive power solutions for cIMDs, from conventional batteries to state‐of‐the‐art energy harvesters and wireless power transfer (WPT) schemes. In particular, WPT has great potential to eliminate the percutaneous wires and overcome frequent battery removal. Here, the fundamentals, power transfer efficiency, antenna design and miniaturization, and operating frequencies in various WPT schemes are presented. Moreover, the power loss attenuation and bio‐safety standard (specific absorption rate) for implants are also considered in WPT design envelope. In addition, wireless data transmission of implantable devices from external to internal milieu (and vice versa) along with different modulation and demodulation techniques are investigated. The last advanced power solutions for cIMDs in in‐vivo and in vitro research are illustrated throughout. Finally, specifications and future potential of WPT systems in cIMDs are highlighted.

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Section: Mid-field Wptmentioning

confidence: 99%

Battery‐Free and Wireless Technologies for Cardiovascular Implantable Medical Devices

Zhang

Das

Zhao

et al. 2022

Adv Materials Technologies

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“…As a result, driving IMDs with dc wires may cause infection aches and pain in the impaired organ [10]. To overcome these drawbacks, wireless power transfer (WPT) has been recently recommended for seamlessly and safely driving IMDs [11], [12].…”

Section: Biotelemetry and Wireless Powering Of Biomedicalmentioning

confidence: 99%

Biotelemetry and Wireless Powering of Biomedical Implants Using a Rectifier Integrated Self-Diplexing Implantable Antenna

Iqbal

Al‐Hasan

Mabrouk

et al. 2021

IEEE Trans. Microwave Theory Techn.

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This article proposes an efficient and complete wireless power transfer (WPT) system (WPTS) for multipurpose biomedical implants. The WPTS is composed of a self-diplexing implantable antenna, efficient rectifier, and WPT transmitter (WPT Tx). The proposed system is capable of simultaneously transmitting recorded data and recharging the batteries of the devices (so as to elongate the implant life). The WPT Tx occupies dimensions of 50 × 50 × 1.6 mm 3 and is optimized to effectively transfer power at 1470 MHz to a 55-mm deep implantable device. An efficient and compact (3.4 × 6.7 mm 2 ) rectifier is used at 1470 MHz to convert the harvested RF power into a useful direct current (dc) power. The proposed rectifier circuit exhibits a high conversion efficiency of 50% even at an input power of −14 dBm and maximum efficiency of 76.1% at 2 dBm. The proposed self-diplexing implantable antenna occupies small dimensions (9.4 mm 3 ) and operates at 915 and 1470 MHz by exciting ports 1 and 2, respectively. The biotelemetry operation is performed using a 915 MHz band (port 1), and the rectifier circuit is connected to port 2 (1470 MHz) to perform wireless powering. The simulated results are validated by examining the individual elements (WPT Tx, rectifier, and self-diplexing antenna) and overall WPTS in a saline solution and minced pork. The results prove that the proposed scheme is suitable for biotelemetry and wireless powering of biomedical implants.

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“…W IRELESS power transfer (WPT) has become rather ubiquitous because of its advantages in applications such as consumer electronic products, portable devices, robotics, electric vehicles, and biomedical implants [1]- [6]. In the modern trend of this research domain, omnidirectional WPT has been investigated with the goal to overcome the restrictions of conventional directional WPT systems [7]- [10].…”

Section: Introductionmentioning

confidence: 99%

Cylindrical Transmitting Coil for Two-Dimensional Omnidirectional Wireless Power Transfer

Liu

Jayathurathnage

et al. 2022

IEEE Trans. Ind. Electron.

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Megahertz-range wireless power transfer has become a promising approach for increasing spatial freedom of charging. This paper proposes a cylindrical-shaped coil, which can produce the homogeneous magnetic field in a plane. The coil consists of two helical windings, which are wound to guide the current in opposite directions. A single power source is used to excite the transmitter without any current amplitude or phase control circuits. Furthermore, since the parasitic capacitance of the coil is not negligible due to the complexity of the coil shape, we develop a general equivalent model with parasitic capacitance for the analysis of complex coils. The system efficiency of the proposed omnidirectional wireless power transfer device is validated by a practical experiment. The measured DC-to-DC efficiency of approximately 72.4% and the load power of 13 W are demonstrated for the proposed wireless charging system at 6.78 MHz operating frequency. Finally, we verify that the electromagnetic exposure satisfies the safety regulations.

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Midfield Wireless Power Transfer for Deep-Tissue Biomedical Implants

Cited by 39 publications

References 14 publications

Battery‐Free and Wireless Technologies for Cardiovascular Implantable Medical Devices

Battery‐Free and Wireless Technologies for Cardiovascular Implantable Medical Devices

Biotelemetry and Wireless Powering of Biomedical Implants Using a Rectifier Integrated Self-Diplexing Implantable Antenna

Cylindrical Transmitting Coil for Two-Dimensional Omnidirectional Wireless Power Transfer

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