| 摘要 |
PURPOSE: A bone expansion frame is provided to uniformly offer propagation pressure to the inside a bone by being expanded by itself with strong expansion force. CONSTITUTION: A spiral flat spring(2) is formed by winding a string of thin and long metal material as spiral shape. The spiral flat spring is inserted into a bone. The spiral flat spring is expanded in the bone by itself and restores elevation of a compressed bone. An end part of the spiral flat spring is streamlined shape. A pedestal groove(6) for winding the spiral flat spring is formed in a center part of the spiral flat spring. A shape memory characteristic is given to the spiral flat spring.
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