Some authors indicate that there is biomedical engineering since the remedies applied to particular problems of the individual as a prosthesis of the big toe that was discovered in an Egyptian tomb with an antiquity of more than 3000 years citation needed . Other authors refer to anatomical drawings of Leonardo Da Vinci and approaches to lever arms or the work of Luigi Galvani and Lord Kelvin on the electrical conduction in the living citation needed . However, the development of electric and electronic instrumentation was an explosion of results and can be considered as one of the closest sources of biomedical engineering. This is mainly between the years 1890 and 1930. Examples include designs for recording electrophysiological signals, beginning with records of AD Waller in human hearts (1887), refinement of the technique by W.Einthoven to develop a string galvanometer (1901) and applying this to record EEG signals in humans by Berger (1924). The electronic instrumentation from vacuum tubes were used by E. Lovett Garceau to amplify these electrical signals and the first commercial system three-channel EEG was built by Alfred Grass in 1935. Another example is the development of imaging instrumentation. Since the discovery of X-rays by R ntgen in 1895 to its first application in biomedicine spent a week. cinergy health Since 1896, Siemens and General Electric already selling these systems. Currently, new developments in imaging have taken much longer to achieve its clinical application. The principle of magnetic resonance was discovered in 1946, but it was not until 30 years later, that may have developed a system for use in humans.

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