Description: Category: Medical Name: Daniel Trask Jode Fourie Mohammed Zaahid Imran Institution: Nelson Mandela University Title: Prosthetic Hand and Socket Description: The AEDG Design team has been brought in to assist with upgrades to the Touch Hand project in preparation for a combined UKZN/NMU team's participation in the Cybathlon event which was to be held in Zurich, but due to the global COVID-19 pandemic it was migrated to an online basis which will be broadcasted from UKZN. The Cybathlon event requires the participating team and their amputee team member to carry out 24 predetermined tasks across 6 stations utilizing the Touch Hand to complete these tasks, against other competing teams from across the globe. The UKZN/NMU team represent South Africa in this exciting tournament. The device was specifically designed for our Pilot, Lungile Dick. Utilizing the Creaform MetraSCAN 3D scan equipment from eNtSA, the AEDG team scanned his arm and produced a custom-made Latticed Nylon Socket that would fit his arm like a glove. The hand is powered by EMG signals from his muscular contractions. IP Statement: This design is intended for possible commercial release involving private sector partners so all IP issues need to be protected as far as possible iro the design. Design Criteria: • Novelty – The prosthetic hand and socket are unique in their design; it has been lightweight as best as possible to ensure that the pilot does not feel uneasy and uncomfortable when wearing the prosthetic hand and socket. • Inventiveness – Most prosthetic hands built in the past have been bulky, our aim is to make the hand as light weight as possible. The socket and hand will be covered in silicon to improve the durability. • Functionality – The cover is screwed onto the top of the palm encasing all the wires and actuators. This makes for easy access if something were to be replaced or fixed. The hand has a quick release latch mechanism to allow the hand to be easily removed from the socket. The prosthetic hand is light weight allowing for easy mobility. • Cost effectiveness – The hand has been designed in such a way to ensure that any future improvements on design or functionality are possible with ease. This is because all the parts are easily removed and are interchangeable to an extent. For example, the quick release latch on the socket allows the socket to be kept when improvements and updates are down on the hand itself. • Aesthetic appeal - the shape of the hand is unique and has been modelled into a shape that closely represents a real hand. The unique lattice socket has been modelled to improve the appearance of the prosthetic hand. • Engineering principles – Bushings have been added to the pins in the fingers to ensure that the fingers run smoothly and do not stick while the pilot is using his/her hand. The connection between the actuator and the finger is a bell crank system to increase mechanical advantage when the hand is gripping something. • Perceived value – The prosthetic hand is a one-of-a-kind design; the socket is also unique being a lattice makes it aesthetically pleasing and it catches your attention increasing the value. • 3D printing knowledge – The whole prosthetic hand and the socket will be 3D printed. The whole design using DfAM practices to ensure that support material is reduced as best as possible. • Target market – The target market would be a user that is missing their hand and is looking for an aesthetically pleasing hand that is lightweight and durable. • Creativity – The prosthetic hand and socket are once again unique in their shape and design, there is no prosthetic hand that looks like this in the world. Many of the prosthetic hands today are generic in shape. • Environmental Impact – The whole hand and socket are 3D printed keeping material wastage down to a minimum. • Freedom of expression – The design pushes the boundaries of generic prosthetic hands and will be a had turner. • 3D printability – The whole prosthetic hand and socket will be 3D printed. It will be printed in such a way that all support material can be removed. Tolerancing has been taken into consideration to ensure that the everything fits like it was designed to. The components will also be printed in such a way to ensure minimal support material is needed.
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