Miniature antenna for RF telemetry through ocular tissue

Chow, Eric Y.; Yang, Chia-Hsiang; Chlebowski, Arthur L.; Chappell, William J.; Irazoqui, Pedro P.

doi:10.1109/mwsym.2008.4633303

Cited by 6 publications

(7 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In an ex vivo study done in [2] using a similar LTCC board, the near-field result showed a 1.75-1.93-dB attenuation while at further distances the attenuation was about 5.89 dB. That data correlates well with the 1.3-2.45-dB attenuation we see at close distances and the 6.9-dB value at further distances.…”

Section: Data and Analysissupporting

confidence: 74%

“…LTCC was chosen for its ease of fabrication, durability, high dielectric, and multilayer capabilities. The ex vivo results of one of our initial LTCC antenna designs is reported in [2]. We modified and optimized the design further for this study, resulting in the design shown in Fig.…”

Section: Antenna Designmentioning

confidence: 99%

“…We used the EM theory and ex vivo experimental results from [2], showing the power reduction effects of biological tissue, to develop an implantable miniature device which integrates a custom-designed low-power application-specific IC (ASIC) and verifies successful transmission in an in vivo environment. Our design of the ASIC with radio-frequency (RF) transmission circuitry has been fabricated through MOSIS on the AMIS C5 0.6-m process.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Implantable Wireless Telemetry Boards for In Vivo Transocular Transmission

Chow

Yang

Chlebowski

et al. 2008

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

Abstract-We report live animal studies that verify and quantify successful transocular transmission of data from a miniature low-power implant. To minimize damage, implantation within layers of the eye requires an ultrasmall device on a scale of just a few millimeters on each side and less than 500 m in thickness. A high-frequency transmitter integrated circuit (IC) was designed, fabricated, and bonded onto a board containing an antenna, matching network components, and interconnects. The transmitter must achieve sufficient efficiency to draw minimal power from the limited onboard storage array while outputting a sufficiently large signal to overcome tissue-induced attenuation. Two different versions of the system were developed, one using a low-temperature co-fired ceramic material for the substrate and the other using silicon. Animal studies performed using live rabbits followed by empirical measurements verified the feasibility of a wireless telemetry scheme for a low-power miniature ocular implant.Index Terms-Biological system modeling, biomedical applications of EM radiation, biomedical telemetry, implantable biomedical devices.

show abstract

Section: Data and Analysissupporting

confidence: 74%

Section: Antenna Designmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Implantable Wireless Telemetry Boards for In Vivo Transocular Transmission

Chow

Yang

Chlebowski

et al. 2008

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…The overall efficiency of wireless powering depends on the rectification efficiency for a given frequency of powering, input power delivered, resonance and impedance mismatch losses, antenna geometry, and tissue losses. The effective power available at the rectifier input depends on multi path losses (~1-10dB for a range of 1-100cm, assuming a two-ray ground reflection model), skin attenuation based on implant depth (~5dB for 1-3mm below the skin, ~30dB for a depth of 3-5cms), antenna efficiency and matching losses (~5-10dB depending on frequency, antenna size and topology) [5]- [6].…”

Section: Headstage Design Considerationsmentioning

confidence: 99%

A generic miniature multi-feature programmable wireless powering headstage ASIC for implantable biomedical systems

Kubendran

Krishnan

Manola³

et al. 2011

2011 Annual International Conference of the IEEE Engineering in Medicine and Biology Society

View full text Add to dashboard Cite

Wireless powering holds immense promise to enable a variety of implantable biomedical measurement systems with different power supply and current budget requirements. Effective power management demands more functionality in the headstage design like power level detection for range estimation and power save modes for sleep-wake operation. This paper proposes a single chip ASIC solution that addresses these problems by incorporating digitally programmable features and thus has the potential to enable wireless powering for many implantable systems. The ASIC includes an RF rectifier which has a peak efficiency of 17.9% at 900 MHz and 11.0% at 2.4 GHz, a robust 1 V bandgap reference and LDO voltage regulator whose output can be programmed in the range of 1 V-1.5 V, and can drive upto 4 mA of load current. The input RF power level detector has a threshold of 1.6 V and the power management block can be programmed to give a 6%, 12.5% or 25% duty cycle power line to the transmitter resulting in upto 60% reduction in average power. The ASIC was fabricated using the TSMC 65 nm process, occupies 1mm(2) die area and the headstage consumes ~300 μA at 1.2V regulated supply.

show abstract

“…This takes advantage of the maturity of stent technology and delivery procedures, as well as producing a novel, enabling platform for using stents as radiating antennas. Previous work has measured the tissue loss faced by transcutaneous telemetry for various antennas, but the use of stent‐based antennas implanted deep within the chest has not been characterized 18–20 . The data transfer technology can be applied in the future to other implantable devices designed to monitor blood pressure.…”

Section: Introductionmentioning

confidence: 99%

Toward an Implantable Wireless Cardiac Monitoring Platform Integrated with an FDA‐Approved Cardiovascular Stent

Chow

Beier

Francino³

et al. 2009

J Interven Cardiology

Self Cite

View full text Add to dashboard Cite

Continuous monitoring of blood pressure from a minimally invasive device in the pulmonary artery can serve as a diagnostic and early warning system for cardiac health. The foremost challenge in such a device is the wireless transfer of data and power from within the blood vessel to an external device while maintaining unrestricted flow through the artery. We present a miniaturized system, which is attached to the outer surface of a regular or drug-eluting FDA-approved stent. When expanded, the stent maintains a patent vessel lumen while allowing contact between the electronic sensors and the blood supply. The stent-based antenna can be used for both wireless telemetry and power transfer for the implanted electronics. Using the stent platform as both a radiating antenna and a structural support allows us to take advantage of an FDA-approved device whose safety and surgical procedure are well established. The electronics package has been reduced to an area of less than 1 mm(2), with a thickness under 300 mum. A minimally invasive implantation procedure allows the delivery of the stent-based implant in nearly any major vessel of the body. This article describes an initial prototype with two stents configured as a single dipole, a 2.4-GHz transmitter microchip, and a battery, and validates transcutaneous transmission through ex vivo and in vivo porcine studies. The results demonstrate the feasibility of a stent-based wireless platform for continuous monitoring of blood pressure.

show abstract

Miniature antenna for RF telemetry through ocular tissue

Cited by 6 publications

References 1 publication

Implantable Wireless Telemetry Boards for In Vivo Transocular Transmission

Implantable Wireless Telemetry Boards for In Vivo Transocular Transmission

A generic miniature multi-feature programmable wireless powering headstage ASIC for implantable biomedical systems

Toward an Implantable Wireless Cardiac Monitoring Platform Integrated with an FDA‐Approved Cardiovascular Stent

Contact Info

Product

Resources

About