Bioengineers, also called biomedical engineers, design tools, devices, and computer software used in health care and applied biological sciences. Using their knowledge in many disciplines, they conduct research and develop solutions to problems. They often have a joint background in engineering and medicine, and frequently work with physicians, therapists, and researchers to solve medical problems. In addition to working in research, bioengineers may also design specialized electrical circuits and software for medical equipment or program computer simulations for virtual experiments of new drug therapies. Some bioengineers design and construct artificial body parts such as joints and prosthetics.