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A study into the fracture control of 3D printed intraosseous transcutaneous amputation prostheses, known as ITAPs

Joshua Bird Euan Langford Christian Griffiths

*Corresponding author: Christian Griffiths c.a.griffiths@swansea.ac.uk

Bioengineering2020,1,29doi:10.3934/bioeng.2020003

Amputated femurs traditionally have multiple health concerns, including the risk of infection. One way to mitigate this risk could be to use an intraosseous transcutaneous amputation prosthesis (ITAP), which is a way of attaching a prosthesis directly to the bone of the user. This paper attempts to customize an ITAP used in a transfemoral amputation so that it fails in a controlled manner, should failure be unavoidable. ABS specimens were 3D Printed and tested to understand how current designs fail. From these tests, an alternative design was developed. Simulations were conducted to insure the optimized design would withstand expected forces from walking. Titanium samples were then produced using additive manufacture and were subjected to tensile testing. These specimens incorporated a notch in the centre of the specimen to act as a stress concentrator. The design presented in this paper identified that the location of failure should move towards the prosthesis, and away from the femur. It was also shown that, titanium was found to have a greater breaking force than the femur; and is therefore not viable for use at this current stage.

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