Siu Ki Ho

Siu Ki Ho

Electronic and Electrical Engineering BEng

Auditory Evoked Responses System

Auditory Evoked Responses System for Estimating the Level of Consciousness

This project involves development of a device for estimating the level of consciousness in a cost effective and efficient manner. The system features the assessment of auditory evoked responses from human brainstem. In conventional technology, devices designed for depth of anaesthesia diagnosis in surgery are normally highly priced and have an impression of being a bulky machine with a large screen for responses observation. A low cost and portable device is therefore desired for the next trend. The target user is a participant with no hearing loss due to the use of auditory evoked response. The system consists of both hardware and software development. In the hardware design, the collection of responses is achieved by attaching sensor electrodes to a patient's scalp, which then performs analogue data processing. The software design has associated the use of a microcontroller Arduino for digital data processing. The results are presented on an LCD module to distinguish the level of consciousness. The undertaken testing scenarios are classified as Usual Case, Thinking Case and Relaxing Case.