| 主权项 |
1. A device for enlarging a diameter of a hole in bone, comprising:
an elongated shaft, the elongated shaft including a proximal end, a distal end and at least two elongated partial-outer surface portions, the at least two elongated partial-outer surface portions combining to define an unexpanded peripheral outer wall, the unexpanded peripheral outer wall having an inner surface and a first diameter; an expandable stylet disposed within the elongated shaft, the expandable stylet having an outer surface, a proximal end, and a distal end, the distal end being configured to retractably extend out of at least the distal end of the elongated shaft to contact the bone; a rod provided in the proximal end of the elongated shaft, the rod being configured to engage the proximal end of the expandable stylet and translate through the expandable stylet, thereby expanding the expandable stylet to define an expanded stylet, the outer surface of the expanded stylet contacting the inner surface of the unexpanded peripheral outer wall, thereby expanding apart the at least two elongated partial-outer surface portions, the expanded-apart at least two elongated partial-outer surface portions defining an expanded peripheral outer wall of the elongated shaft, the expanded peripheral outer wall of the elongated shaft having a second diameter greater than the first diameter; and a cutting portion disposed on and at least partially around the peripheral outer wall of the elongated shaft between the proximal end and the distal end, the cutting portion configured to cut the bone as the expanded peripheral outer wall of the elongated shaft is inserted into the bone to enlarge the diameter of the hole in the bone, thereby defining at least one bone fragment; wherein the elongated shaft is substantially hollow and is configured to capture the at least one bone fragment. |
