Design and Development of Advanced External Fixator for Treatment of Femoral Bone Fracture

Agegnehu, Talaksew Misganaw (2017) Design and Development of Advanced External Fixator for Treatment of Femoral Bone Fracture. Masters thesis, Addis Ababa University.

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The incidence of accidents causing major injuries globally is increasing every year. Previous studies indicated that more than 90% of the incidences happen in the developing world. In case when the scope of the accident is high, that often creates fractures particularly on strong and heavy bones (femoral and tibia in the lower extremities). In this regard different methods are available to treat fractured bones including tractions, internal and external fixators and their variants. Traction is one of the oldest treatment methods currently used in many clinics as a temporary treatment of long bone fractures through suspension of weights using ropes over pulleys and attached to the patient bed. Such a procedure does not allow patients movement and could result in many known complications: depression, bed sores, pneumonia and urinary infections to mention a few. The internal fixators like intramedullary nails are the gold standard implants for fixation of long bone fractures. However high cost, lack of adequate professionals and instruments in low resource settings, location of the accident, need for multiple surgeries and cultural and/or physiological patient/family related issues for operation significantly hinder patients from getting the service. External fixation management applies aligning/realigning fractures using pins, wires, clamps, and bars or rings. It has advantages of simplicity, ease of adjustability, and increased access for fracture related wound care and wound monitoring. However, the solid bars often used to make fractured fragments rigid has no flexibility, do not employ a force on the muscles tensioned by the fixators and have no micro movement setup. This creates immediate functionality problem after recovery and reduce fast healing process for the fractured bone because loading has considerable effect on tissue repair and remodeling. A thorough investigation of literatures on fixators (especially external fixators) carried out in the current study showed that applying continuous load/force on fractured limbs increases the functionality of the muscles during the bone healing process thereby reducing the rehabilitation time after recovery. In this regard, based on Solidwork, an advanced external fixator has been proposed in the current study that makes use of a spring load mechanism to exert a continuous load/force. Detailed 2D and 3D design and simulation of the mechanism has been presented. The proposed external fixator also comes with a traction functionality.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Biomedical Engineering
Subjects: R Medicine > RA Public aspects of medicine
R Medicine > RD Surgery
R Medicine > RZ Other systems of medicine
T Technology > T Technology (General)
T Technology > TP Chemical technology
Divisions: Africana
Depositing User: Andriamparany Edilbert RANOARIVONY
Date Deposited: 20 Jul 2018 13:07
Last Modified: 20 Jul 2018 13:07

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