Fon Yih Tsuang,Chia Hsien Chen,Chang Jung Chiang,Yi Jie Kuo
申请号：
US14532410
公开号：
US09877751B2
申请日:
2014.11.04
申请国别(地区):
US
年份:
2018
代理人:
摘要：
A bone screw of minimally invasive fixation device for lumbar comprises a positioning casing and a screw body. The positioning casing includes a rod securing base and an alignment portion, both of which are integrally formed； an annular notch is formed between them. The alignment portion has at least two pairs of rod alignment openings in a bulb-shaped or keyhole-shaped form with an upper portion larger than a lower portion. Two longitudinal notches extend from near the top across the alignment openings to the rod securing base. The screw body includes a spherical head and a screw rod； the outer diameter of the spherical head is larger than that of the screw rod. The screw body is rotatably connected to the bottom portion of the positioning casing； the spherical head of the screw body is arranged in the spherical pit of the rod securing base.
