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Solomon C. Nwaneri, PhD, Department of Biomedical Engineering, University of Lagos.  E-mail: snwaneri@unilag.edu.ng Medical devices are invaluable to medical practice. The numerous innovations in the development of medical devices has led to significant improvement in healthcare services including diagnosis and treatment. Simple and complicated medical procedures are now performed across different hospitals globally leading to a decline in mortality and morbidity rates. These procedures cannot be done without the use of medical devices. Although, many medical devices are mostly used for disease diagnosis, others are used for therapeutic purposes as well to treat patients. The defibrillator is a typical therapeutic medical device which can be used to revive a person who suffers from a heart attack. While some medical devices are extremely cheap and affordable for example, an oral thermometer costs as low as $1. Some other medical devices are very expensive and unaffordable. For example