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

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

J Neural Eng. 2018 Jan 05;:

Authors: Dehkhoda F, Soltan A, Ponon N, Jackson A, O'Neill AG, Degenaar P

Abstract
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. 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 the potential for probe surfaces to exceed the 2^○C regulatory. However, currently there are no convenient mechanisms to monitor this in-situ. This paper, therefore, presents a method to utilize the light emitting diode as its own temperature sensor. We present the electronic control circuit, and calibration method to achieve this. Efficacy is demonstrated in air, saline, and brain.

PMID: 29303113 [PubMed - as supplied by publisher]

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