Patent ID: 8591232

Claim:
A drill for sinus membrane lift, comprising: an elongated body extending longitudinally along a longitudinal center axis thereof; a head disposed at a distal end of the elongated body and having a distal contact surface for coming in face contact with a sinus membrane, the distal contact surface having a curved or generally convex surface contour disposed symmetrically about a central axis of the head, which axis is coaxial with the longitudinal center axis of the elongated body; and a bone-maintaining area connected to the distal contact surface and shaped in a groove extending in a longitudinal direction of the elongated body to store and discharge drilled bone fragments, wherein the groove of the bone-maintaining area includes a first inside wall and a second inside wall connected to the first inside wall, the first inside wall oriented in a drilling direction, and the second inside wall opposite the first inside wall, wherein the central axis of the head is passing through a front-end groove area of the bone-maintaining area, and the first inside wall has a drilling surface and is formed higher than the second inside wall so that the drilling surface is exposed in the drilling direction, wherein the groove of the bone-maintaining area extends from the head to a portion of the elongated body.