This book constitutes the thoroughly refereed post-conferenceproceedings of the Third International Joint Conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2010, held in Valencia, Spain, in January 2010. The 30 revised full papers presented together with 1 invited lecturewere carefully reviewed and selected from a total of 410 submissions intwo rounds of reviewing and improvement. The papers cover a wide rangeof topics and are organized in four general topical sections onhealthinf, biodevices, biosignals, and bioinformatics.