Ingestible capsule antenna for bio-telemetry

Izdebski, Phillip; Rajagopalan, Harish; Rahmat‐Samii, Y.

doi:10.1109/iwat.2009.4906937

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…Furthermore, these depths are higher than 5 cm, which appear to be the commonly employed gap in body-centric communications [14]. As it is not always possible to design and verify the functionality of the telemetry link in the presence of actual tissues, human body phantoms are widely used in medical research both for safety analysis and for the development of novel diagnosis and treatment techniques [18]. In contrast to the human subjects, the phantoms provide a stable, longlasting, controllable, and easy to produce and use propagation environment.…”

Section: Human Body Phantommentioning

confidence: 99%

“…Hence, to capture the dynamic behaviour of the implant and to account for the strong attenuation and multiple reflections of the electromagnetic waves in a biological environment the implanted coil is surrounded, and separated from the transmitter coil, by a human body simulant. The best practice to represent the average body properties, in numerical modelling, is to consider the electrical properties of the human body simulant as 2/3rd those of pure muscle [27,18]. The dielectric properties of the human muscle for a wide range of frequencies are given in table 2.…”

Section: Coupling In the Presence Of A Human Body Phantommentioning

confidence: 99%

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Secure wireless actuation of an implanted microvalve for drug delivery applications

Tikka

Faulkner

Al-Sarawi

2011

Smart Mater. Struct.

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The capability to wirelessly control fluid flow through a microvalve can emerge as an attractive technology enabling various biomedical applications such as remote drug delivery and in vitro diagnostics. Contactless powering of such a microvalve is best addressed by near-field inductive coupling due to its close proximity to the external interrogator. In this paper, we propose the use of the same technique for secure remote interrogation and powering of a human implantable, surface acoustic wave (SAW) correlation-based, passive microvalve. This is carried out by interrogating the microvalve with a Barker sequence-encoded BPSK signal. A numerical and experimental analysis of the biotelemetry link for the microvalve was undertaken in the vicinity of numerical and physical human body phantoms, respectively. To accurately account for the path losses and to address the design optimization, the receiver coil/antenna was solved simultaneously with the transmitter coil/antenna in the presence of a human body simulant using three-dimensional, high frequency electromagnetic FEM modelling. The received relative signal strength was numerically and experimentally derived for a miniature (6 mm × 6 mm × 0.5 mm), square spiral antenna/coil when interrogated by a handheld 8 cm × 5 cm × 0.2 cm square spiral antenna/coil in the near-field. Finally, the experimental results agreed well with the FEM analysis predictions and hence ascertained the applicability of the developed system for secure interrogation and remote powering of the newly proposed microvalve.

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Section: Human Body Phantommentioning

confidence: 99%

Section: Coupling In the Presence Of A Human Body Phantommentioning

confidence: 99%

Secure wireless actuation of an implanted microvalve for drug delivery applications

Tikka

Faulkner

Al-Sarawi

2011

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…The location of implanted antennas is usually under the skin or in fat and muscle tissues [7][8][9]. Applications include implants beneath the skull for the transmission of RF signals to antennas out of the body [10], intraocular for retinal prosthesis [11], ingestible capsules for monitoring human intestines [12], and induction loops for the powering sensors and implants inside the human body [13].…”

Section: Introductionmentioning

confidence: 99%