Here is an old project which was rediscovered in an old drawer recently - the Medifib. Only two units were ever made and one was sold to a Sydney hospital. The Medifib is designed to give out a 15V square wave at 50Hz and 20mA maximum so that it may be connected to a heart during heart surgery and make it go into fibrillation. During heart surgery, drugs make the heart stop beating so the operation may be carried out, and when the operation is finished, other drugs are injected to let the heart start beating again. If there are any small leaks, the Medifib can then be used to make the heart quiver at 50Hz and allow the surgeon to do the final fixups.
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