Drill sleeve

摘要

A drill sleeve includes a lower end that engages a bone being drilled with a drill bit of a drill during an orthopedic procedure, an upper end that is movable with respect to the lower end, and a fluid damper between the upper and lower ends for resisting movement of the upper end with respect to the lower end and which may reduce a distance at which a drill bit can plunge through a back side of the bone by increasing resistance to drill movement at occurrence of plunge through the back of the bone. The drill sleeve may include measurement scale and a lock that prevents relative motion of the upper and lower ends after the bone has been drilled for evaluating a position of a depth indicator with respect to the measurement scale that corresponds to a depth of the bore in the bone.

主权项

1. A drill sleeve for use in forming a bore in a bone with a drill bit that is rotated by a drill that can move in a drilling direction toward the bone during an orthopedic procedure, the drill sleeve comprising:
a base having a first surface for engaging a surface of a bone to be drilled, the base defining a passage that can receive the drill bit to engage the bone; a slider having a second surface abutting the drill with movement of the drill in the drilling direction, the slider mounted for movement with respect to the base so that movement of the drill in the drilling direction moves the slider toward the base; and a fluid damper arranged with respect to the base and slider for resisting movement of the slider, wherein the fluid damper is configured to increase the resistance to the movement of the slider with respect to the base in response to an increase in velocity of the drill in the drilling direction.