- You may also be looking for the TNG holodeck character Felix Leech.
The leech is a specific animal that attaches itself to another creature, usually absorbing some of its blood. This ability allowed leeches to be used in medicine, typically by primitive cultures.
Doctor Phlox was fond of leeches as a snack. In 2154, he snacked on some leeches while dictating a letter to Dr. Jeremy Lucas. He also fed one to a begging Porthos after warning him that it would clear out the dog's intestinal tract. (ENT: "Doctor's Orders")
In the final draft script of "Doctor's Orders", these leeches were not identified as such. They were instead described as "slimy, leech-like object"s and "leech-like thing"s.
The Emergency Medical Hologram of the USS Prometheus told The Doctor, after arriving in the Alpha Quadrant, that advances in medical equipment since the USS Voyager left meant that "scalpels and leeches" were not used anymore. (VOY: "Message in a Bottle")
In 2377, when The Doctor was forced to work aboard Hospital Ship 4-2, he complained "With technology this primitive you may as well be using leeches." (VOY: "Critical Care")
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