Foot diseases represent an important societal problem and the large majority of people affected are women. The Hallux Valgus, commonly known as bunion, is the most frequent foot deformity and affects 20% of adult women. This pathology, together with others such as hammertoes, claw toes, metatarsalgia and ingrown nails take place at the forefoot and are mainly caused by the prolonged use of inadequate footwear, due to the mismatch between the morphometry of the foot and the footwear.
At the heart of the recovery process are the Shape Memory properties of the shoes’ 'upper', which is the ability to keep a form given by mechanical action and to return to its initial shape when heated.
InstantShoe. Credit: Biomechanics Institute of Valencia
The new designed textile is placed between shoe’s outer leather and inside lining during gluing process, and provides the shape memory effect to the composite structure. The key component to get this memory effect is a textile including wires made of shape memory material called Nitinol, an alloy of Nickel and Titanium, which are inserted in the textile structure with a particular patented pattern. Metallic filaments differ from textile yarns by their very high stiffness which makes them not compatible with a traditional knitting process. As a consequence, machinery adaptation was necessary before being able to run the loom with these wires.
InstantShoe is part of the DemoShopInstantShoe project, which received funding from the Seventh Framework Programme of the European Commission and is a direct follow on from the ShopInstantShoe project of 2012.
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