Fenestration burr
A cochlear fenestration burr includes a shaft oriented along a longitudinal axis of rotation of the burr, a cylindrical depth stop member oriented along the axis, the depth stop member having a thickness dimension, a diameter dimension and a contact surface, an extension member extended outward from the contact surface and coaxial with the axis, a cutting member having a cutting surface supported by the extension member, and a cutting tip at the end of the cutting member in the center of the cutting surface and coaxial with the axis. A maximum cutting depth is defined by a distance along the axis between an end of the cutting tip and the contact surface. A cutting grit is disposed on the cutting tip and cutting surface.
1. A cochlear fenestration burr, comprising:
a shaft oriented along a longitudinal axis of rotation of the burr;
a cylindrical depth stop member oriented along the axis, the depth stop member having a thickness dimension, a diameter dimension and a contact surface;
an extension member extended outward from the contact surface and coaxial with the axis;
a cutting member having a cutting surface supported by the extension member;
a cutting tip at the end of the cutting member in the center of the cutting surface and coaxial with the axis, a maximum diameter of the extension member being less than a maximum diameter of the cutting member;
a cutting depth defined by a distance along the axis between an end of the cutting tip and the contact surface; and
a cutting grit disposed on the cutting tip and cutting surface wherein the cutting depth is less than or equal to about 2.5 mm.
2. The device of claim 1 , wherein the diameter dimension of the cylindrical depth stop member is less than or equal to about 4.0 mm.
3. The device of claim 2 wherein the cutting grit includes particles of diamond.
4. The device of claim 2 , wherein the cutting member comprises titanium.
5. A method for preparing a fenestration in a cochlea of a patient with a fenestration burr, the burr including a shaft disposed along a longitudinal axis of rotation, a depth stop member having a contact surface, height dimension and diameter dimension, and an extension member supporting a cutting member having a cutting surface with a pointed tip, a maximum diameter of the extension member being less than a maximum diameter of the cutting member, the method comprising:
locating the fenestration burr at a desired location of the fenestration;
rotating the burr to cut into the cochlea;
using the tip to lock the burr in position and avoid lateral movement of the burr during the rotating; and
limiting the depth of the cut made by the burr with the contact surface.
6. The method of claim 5 , wherein the cutting surface includes diamond particles.
7. The method of claim 5 , wherein the limiting limits the depth to a distance along the axis between an end of the tip and the contact surface.
8. The method of claim 5 , further comprising:
using the diameter of the depth stop member to align the burr during the rotating.