Live leeches were commonly used because
of their double ended suckers that were
applied to the skin to eliminate any number
of undesirable conditions such as infected
cuts and certain inflammations.
Leech therapy
according to
historians was used
in ancient Egypt 3.500
years ago and today,

Today, Medical
Leeches are available
in the USA. The FDA
classified them in
2004 as the first live
medical devices.

Source On line:
Live Science