implantable device
Beginner
A medical device put inside the body, like a pacemaker, and left there for years.
Novice
An electronic medical device placed inside the body by surgery and left there for years, such as a pacemaker or a nerve stimulator. It runs on a battery that can’t easily be replaced, a rechargeable battery, or power sent wirelessly through the skin.
Expert
A device whose electronics sit in a hermetic package exposed to body temperature and fluids for their whole life. Replacement means surgery, so battery life and reliability dominate the design.
Explained in Medical devices (Industries).