Langford Euan, Griffiths Christian Andrew, Rees Andrew, Bird Josh
The Defence Science and Technology Laboratory (DSTL), Fareham PO17 6AD, UK.
College of Engineering, Swansea University, Swansea SA1 8EN, UK.
Micromachines (Basel). 2021 Mar 12;12(3):298. doi: 10.3390/mi12030298.
This paper studies the forces acting upon the Intraosseous Transcutaneous Amputation Prosthesis, ITAP, that has been designed for use in a quarter amputated femur. To design in a failure feature, utilising a safety notch, which would stop excessive stress, σ, permeating the bone causing damage to the user. To achieve this, the topology of the ITAP was studied using MATLAB and ANSYS models with a wide range of component volumes. The topology analysis identified critical materials and local maximum stresses when modelling the applied loads. This together with additive layer manufacture allows for bespoke prosthetics that can improve patient outcomes. Further research is needed to design a fully functional, failure feature that is operational when extreme loads are applied from any direction. Physical testing is needed for validation of this study. Further research is also recommended on the design so that the σ within the ITAP is less than the yield stress, σ, of bone when other loads are applied from running and other activities.
本文研究了用于股骨四分之一截肢的骨内经皮截肢假体（ITAP）上的作用力。为了设计一种失效特征，采用安全缺口，以阻止过大的应力σ渗透到骨骼中，对使用者造成损伤。为此，使用MATLAB和ANSYS模型，在广泛的部件体积范围内对ITAP的拓扑结构进行了研究。拓扑分析在对施加的载荷进行建模时确定了关键材料和局部最大应力。这与增材制造相结合，能够制造定制的假肢，从而改善患者的治疗效果。需要进一步研究设计一种全功能的失效特征，使其在从任何方向施加极端载荷时都能发挥作用。需要进行物理测试来验证本研究。还建议对该设计进行进一步研究，以便在跑步和其他活动施加其他载荷时，ITAP内的σ小于骨骼的屈服应力σ。
