Wiener Antrum RaspNewMed® Wiener Antrum Rasp is useful in turbinectomy procedures. Features overall length 7-1/2" (19.0 cm). The curved end of the rasp is used to enlarge bony openings such as the inferior meatus. The trocar tip at the end is 3.5mm and is also offered in a blunt style of 3.5mm. ..