Medical technology applies engineering to biology and medicine-for example ,in the development of aids or replacements for defective or missing body parts.Bioengineering combines biological science with engineering.
One product of bioengineering is the artificial heart.This is made of metal and plastic.It is used to keep very sick patients alive who might die while waiting for a transplant of a natural heart. An artificial heart has an electric motor and a pumping system with hydraulic fluid and hydraulic valves. It has external and internal parts (that is,outside and inside the body). Inside the body is a rechargeable battery which powers the pumping system. This internal battery is recharged by an external battery using a simple eletrical coil,which induces a current. This current than recharges the internal battery. The whole system is controlled by a microprocessor (also called a controller) inside the body. Of course,biological safety is very important. So the plastics in the artificial heart are very durable. There is also a heart pacemaker under the skin ,which keeps the heart working at a regular pace.