Wireless Telemetry for Implantable Biomedical Microsystems

Asgarian, Farzad; Sodagar, Amir M.

doi:10.5772/12997

Cited by 25 publications

(19 citation statements)

References 42 publications

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“…Concerning the individual components of such an implant [75,76,77] like e.g. bio-signal amplifiers [78,79,80], analog-to-digital converter [81,82,83], data processors [42,84], wireless data transfer sub-system [85,86,87,88,89,90,91,92,61], or energy harvesting [93,94] a large number of publications exist.…”

Section: Discussionmentioning

confidence: 99%

“…Although there are approaches for wireless data exchange [31] (using various technologies, e.g. Ultra-Wide Band [32], Offset Quadrature Phase Shift Keying [33], Amplitude Shift Keying [34], Frequency Shift Key Modulation [35], RF backscattering [36] and RF ID Technology [37]) and energy transmission systems [38,39,40], especially for neuronal implants, these systems are not available on the market.…”

Section: Introductionmentioning

confidence: 99%

“…Although there are approaches for wireless data [Asgarian and Sodagar, 2011] (using various technologies, e.g. Ultra Wide Band [Chae et al, 2009], Offset Quadarture Phase Shift Keying [Liu et al, 2009], Amplitude Shift Keying [Navaii et al, 2012], Frequency Shift Key Modulation [Borton et al, 2013], RF Backscattering [Schwerdt et al, 2011] and RF ID Technology [Aubert, 2011]) and energy transmission systems [Olivo et al, 2011, Rapoport et al, 2012, Ho et al, 2014, especially for neuronal implants, these systems are not available on the market.…”

Section: Introductionmentioning

confidence: 99%

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Open Hardware: Towards a Fully-Wireless Sub-Cranial Neuro-Implant for Measuring Electrocorticography Signals

Rotermund

Pistor

Hoeffmann

et al. 2016

Preprint

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Implantable invasive neuronal interfaces to the brain are an important keystone for many interesting future medical applications. However, entering this field of research is difficult since such an implant requires components from many different fields of technology. Beside the required amplifiers, analog-digital-converters and data processing, the complete avoidance of wires is important because it reduces the risk of infection and prevents long-term bio-mechanical problems. Thus, means for wireless transmitting data and energy are also necessary.We present a module, containing the necessary components for wireless data transfer and inductive powering for such implantable neural systems, and its base station. They are completely built of commercial off-the-shelf (COTS) components and the design files are available as Open Hardware / Open Source. The data is transmitted via Microsemi ZL70102 transceivers and custom Tx/Rx antennas for bidirectional communication using frequencies in the MICS band, with a maximal data rate of 515 kbit/s. The energy is transmitted via a wireless inductive energy-link based on the Qi standard. On the implant site a handwound litz wire coil harvests energy from the magnetic field and delivers, over a short distance, more than enough inductive power to the fully implantable unit.Based on this wireless module we also present a fully wireless neuronal implant for simultaneously measuring electrocorticographic (ECoG) signals at 128 locations from the surface of the brain. The implant is based on a flexible printed circuit board and is aimed to be implanted under the skull. 1The application-specific integrated circuit (ASIC) was designed in-house and allows to adapt the data processing of the implant to changing user-defined parameters.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Open Hardware: Towards a Fully-Wireless Sub-Cranial Neuro-Implant for Measuring Electrocorticography Signals

Rotermund

Pistor

Hoeffmann

et al. 2016

Preprint

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“…Data transfer via radio-frequency transmissions (e.g. [82,102,106,107,108,109,110,111,112,113,114,115,116,117]). 2.)…”

Section: Rhdmentioning

confidence: 99%

Open Hardware for neuro-prosthesis research: A study about a closed-loop multi-channel system for electrical surface stimulations and measurements

Rotermund

Ernst

Pawelzik

2017

Preprint

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Recent progress in neuro-prosthetic technology gives rise to the hope that in the future blind people might regain some degree of visual perception. It was shown that electrically stimulating the brain can be used to produce simple visual impressions of light blobs (phosphenes). However, this perception is very far away from natural sight. For developing the next generation of visual prostheses, real-time closed-loop stimulators which measure the actual neuronal activities and on this basis determine the required stimulation pattern. This leads to the challenge to design a system that can produce arbitrary stimulation-patterns with up to ±70V and with up to 25mA while measuring neuronal signals with amplitudes in the order of mV. Furthermore, the interruption of the measurement by stimulation must be as short as possible and the system needs to scale to hundreds of electrodes. We discuss how such a system and especially its current pumps and input protection need to be designed and which problems arise. We condense our findings into an example design for which we provide all design files (boards, firmwares and software) as open-source. This is a first step in taking the existing open-source www.open-ephys.org recording system and converting it into a closed-loop experimental setup for neuro-prosthetic research.

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“…Therefore, on the implant side, the wireless interface is typically consisted of a rectifier and voltage regulator (power telemetry), data receiver (forward telemetry), and data transmitter (reverse (a) (b) telemetry). In depth discussions of wireless telemetry are presented in [70] by the authors. Hence, in this section we briefly review some of the important principles and methods in this field.…”

Section: Wireless Telemetrymentioning

confidence: 99%