Patent ID: 8292890

Claim:
A bone dilator, comprising: a head portion, a neck portion, a connecting tube, a handle and a rotary hilt, wherein the head portion and the neck portion are integrated as a whole via hinged joint therebetween; the head portion, the neck portion, the connecting tube and the handle are hollow bodies, through which a pull rod penetrates; the rotary hilt is connected to a tension bolt, which is connected to one end of the pull rod; another end of the pull rod is provided with bar stays at both sides thereof, and the two ends of the bar stays are movably connected to the pull rod and the head portion, respectively, via pins; a distal end of the connecting tube is movably connected to a proximal end of the neck portion, and a proximal end of the connecting tube is fixedly connected to a distal end of the handle; a distal end of a hilt support is disposed at a proximal end side of the handle, and the rotary hilt is movably connected to a proximal end side of the hilt support, wherein when the rotary hilt is rotated clockwise and the pull rod is pulled backwards, an upper part of the head portion and a lower part of the head portion keep at a predetermined angle other than parallel during expanding, and wherein when the rotary hilt is rotated counterclockwise and the pull rod is pushed forwards, the upper and lower parts of the head portion fold; and wherein the bar stays include a proximal pair of bar stays and a distal pair of bar stays, each of the bar stays having a first end and a second end, the first ends being movably connected to the pull rod, the second ends of the distal pair of bar stays movably connected to the inside of the head portion, and the second ends of the proximal pair of bar stays being movably connected to both the distal end of the neck portion and the proximal end of the head portion via connecting pins.