| abstract |
A set of fenestration burrs, for fenestrating otic capsule bone ( 34 ), includes an initial burr ( 150 ) and a sequence of fenestration polishing burrs ( 180 ). A polishing burr ( 152, 1521 ), of each of the burrs ( 150, 180 ), carries at least one spiraling flute ( 166, 166 ′). Fenestrations ( 36 ) piercing the bone ( 34 ) formed using the burrs ( 150, 180 ) exhibit uniform diameters while excluding bone dust from the inner ear. An implantable casing ( 72 ) includes a hollow collar ( 76 ) from which projects a hollow sleeve ( 74 ) receivable into the fenestration ( 36 ). The casing ( 72 ) is secured there by at least one prong ( 92, 102 ) jutting from the sleeve ( 74 ). A therapeutic appliance ( 134 ) is insertable into the casing ( 72 ). A flange ( 116 ) extending from one end of the sleeve ( 74 ) carries at least one L-shaped slot ( 122 ) open at one end and extending circumferentially around the flange ( 116 ). |