Contrary to its name, emesis basins are not usually used for vomiting, as the depth, size, and sloping walls all contribute to spilling or splashing the vomit rather than catching it.
Despite its name, emesis basins are not usually employed for inducing vomiting. Instead, their design – with a certain depth, size, and sloping walls – tends to cause the vomit to spill over or splash out rather than being caught.