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Self-sensing of temperature rises on light emitting diode based optrodes

Lookup NU author(s): Dr Fahimeh Dehkhoda, Dr Ahmed Abd El-Aal, Dr Nilhil Ponon, Professor Andrew Jackson, Professor Anthony O'Neill, Dr Patrick Degenaar

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

Objective . This work presents a method to determine the surface temperature of microphotonic medical implants like LEDs. Our inventive step is to use the photonic emitter (LED) employed in an implantable device as its own sensor and develop readout circuitry to accurately determine the surface temperature of the device. Approach . There are two primary classes of applications where microphotonics could be used in implantable devices; opto-electrophysiology and fluorescence sensing. In such scenarios, intense light needs to be delivered to the target. As blue wavelengths are scattered strongly in tissue, such delivery needs to be either via optic fibres, two-photon approaches or through local emitters. In the latter case, as light emitters generate heat, there is a potential for probe surfaces to exceed the 2 °C regulatory. However, currently, there are no convenient mechanisms to monitor this in situ . Main results . We present the electronic control circuit and calibration method to monitor the surface temperature change of implantable optrode. The efficacy is demonstrated in air, saline, and brain. Significance . This paper, therefore, presents a method to utilize the light emitting diode as its own temperature sensor.


Publication metadata

Author(s): Dehkhoda F, Soltan A, Ponon N, Jackson A, ONeill A, Degenaar P

Publication type: Article

Publication status: Published

Journal: Journal of Neural Engineering

Year: 2018

Volume: 15

Issue: 2

Pages: 026012

Print publication date: 25/01/2018

Online publication date: 05/01/2018

Acceptance date: 05/01/2018

ISSN (print): 1741-2560

ISSN (electronic): 1741-2552

Publisher: IOP

URL: https://doi.org/10.1088/1741-2552/aaa56d

DOI: 10.1088/1741-2552/aaa56d


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