Eustachian Catheter Eustachian catheter consisting of a hollow metal tube, engraved with a scale along the shaft and marked with the number "3" on the wider end, which also features a ring holder. This item was originally found inside the Laryngoscope Set (MIMM/2024-4-7) but has been removed and catalogued separately, as it was not part of the original set. Donated by Joseph Martin. 1900-1949