| 摘要 |
An apparatus for treating a bone, which provides a path from the skin to a bone, is provided which comprises a cannula with an improved coupling structure, an expander, a needle, and a spacer. With the apparatus, operation time can be reduced. The cannula and the expander can be easily combined together or separated from each other. Further, the needle can be easily removed from the bone. In addition, an insertion space for a cavity-forming instrument, such as a balloon catheter, can be easily obtained inside the bone.
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