Chi-Sheng CHIEN,Tsung-Chih Yu,Chung-Hsing Yu,Shien-Nan Kuo
申请号：
US13678772
公开号：
US20130131733A1
申请日:
2012.11.16
申请国别(地区):
US
年份:
2013
代理人:
摘要：
A bone screw includes a front portion, a rear portion, and a shaft portion. The shaft portion is fixedly joined to the front portion and the rear portion, so as to form an integral bone screw. The Youngs modulus of the shaft portion is smaller than that of the front portion and that of the rear portion.
