Jeffrey D. Vlahos;Jeffrey A. Hoffman;Jason P. Sandstrom
发明人:
Jason P. Sandstrom,Jeffrey A. Hoffman,Jeffrey D. Vlahos
申请号：
US12977968
公开号：
US08545505B2
申请日:
2010.12.23
申请国别(地区):
US
年份:
2013
代理人:
摘要：
Instruments are provided for shifting elongate members, such as spinal rods, with respect to coupling members of spinal fixation systems. The instruments include a low friction drive mechanism having one or more rolling elements that ride along a helical groove or track in order to transform rotational movement of a drive member into linear shifting of a reducer member that shifts the elongate member. A one-way locking mechanism may be provided to selectively prevent unwanted counter-rotation of the low friction drive mechanism. The one-way locking mechanism may include annular ratchet teeth arranged on the exterior of the drive member and a ratchet pawl located adjacent to the teeth and selectively engageable therewith.
