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Engineer Khaled Nedal Mahmod Sobh delivered a keynote speech at the International Conference on "Digital Economy and Public Governance"

Time:2022-12-06 16:45:28 From: Writer: Hits:

Engineer Khaled Nedal Mahmod Sobh at the University of Malaya delivered a keynote speech titled Development of a New Low Cost Wearable Cuff System for Prosthetic Interface. He pointed out that the assessment approaches utilized for people with muscular difficulties are critical to resolving the problem and filling the gap left by the muscle deficiency. Examining the residual limb muscles makes it possible to understand amputees' demands in their rehabilitation process. The amputees' time-varying muscle activity reduces the efficiency of using powered prosthetics with sensors in fixed positions inside the socket, making it difficult for them to continue using the prosthesis in this situation. A variation in the level of muscle activation may occur depending on the amputees' daily motion activity or routine because every motion activity has its dynamic that is dependent on muscle activity.

He introduced a new reliable cuff system that uses a simple, non-invasive sensors -a based sensor that can measure muscle contraction by investigating the best positional parameter of EMG for transtibial prosthetic users (TTAmp) to be effective in multiple movement activities and compare with the normal human muscles activities. DELSYS Trigno wireless EMG instrument was used to achieve this aim. By comparing ten non-amputee subjects and two transtibial amputee subjects, and the surface EMG signals were recorded from two anterior and posterior below knee muscles; tibialis anterior (TA) and gastrocnemius lateral head (LG), and two anterior and posterior above knee muscles; rectus femoris (RF) and biceps femoris (BF) during five activities; muscles strengthening, flexion and extension, gait cycle (normal walking), descending the stairs and ascending the stairs. The result is that some muscles are active and useful in the performance of certain activities, but they are not effective in other activities, so it is difficult to rely entirely on the static positioning of the sensor within the socket due to the possibility of that sensor to be in contact with inactive muscle so there will be a gap in the control leads to decrease the functional efficiency of the powered prostheses. There is, therefore, a need to put the sensor out of the socket to reduce this gap in prosthetic limbs control by amputees and to ensure that each sensor is connected to an active muscle of which through the signal from that active muscle can increase the control efficiency and make the muscles activation assessment process easier for both the Practitioner and amputee people.