Abstract
The right-angle knife ( A , Fig. 1, 4 mm. long) cuts on the pull. It is on the curved shank B (2 mm. in diameter and 40 mm. long), which slips in the barrel C (3.5 mm. in diameter). The hook D (8 mm. long) is adjustable right and left. To cut the vertical plate of the ethmoid (septal side) from its roof, the knife is passed under the middle turbinate to the posterior nares, the shank between the middle turbinate and septum, and then the shank is pushed high up in the nose, which places the knife between the posterior tip of the middle turbinate and anterior sphenoidal wall. If only part of the ethmoid cells and middle turbinate is to be removed, the hook (which should not be locked when introduced in a close nose , as it is easily anchored with a probe) is anchored at the junction of
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