Em canon, eu não acho que a Maldição Expelindo Entrail seja mencionada novamente fora de HP e da Ordem da Fênix , capítulo 22. Tudo o que sabemos é que ela foi inventada por Urquhart Rackharrow em 1600. A palavra "Maldição" sugere que possa ser usada como arma, mas o fato de seu retrato estar pendurado no hospital mágico de St. Mungus sugere que ele tem alguma aplicação médica.
HP Lexicon oferece as seguintes observações:
The term "entrail-expelling" is not something most people would like to think about, much less study. Another word often used to describe the same thing is "disembowelment." You might recall that Snape made Neville "disembowel" a barrel full of horned toads as a detention once -- not a pleasant task (GF14). While disemboweling creatures might be useful in potions-making - getting armadillo bile also comes to mind (GF26) - there are not many good reasons for wanting to remove entrails from humans while they are still alive, except for torture. Also the fact that it is a "curse" makes it sound even more terrifying. Since Urquhart Rackharrow was apparently some type of healer to be honored with a portrait at St. Mungo's, let's hope there was a humane surgical reason for using such a "harrowing" spell. Or perhaps Rackharrow studied bodies after death as a coroner or forensic pathologist.