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PEDICLE SCREW EXTENSION FOR USE IN PERCUTANEOUS SPINAL FIXATION
专利权人:
发明人:
Scott McLean,Steven Seyer
申请号:
US15242838
公开号:
US20160354125A1
申请日:
2016.08.22
申请国别(地区):
US
年份:
2016
代理人:
摘要:
A bone screw extension assembly for use in placing a connecting rod percutaneously into tissue of a patient comprises a multi-axial bone screw and a screw extension releasably coupled to yoke of the bone screw. The screw extension includes coaxially disposed outer sleeve and inner sleeves that are rotatable relative to each other. A screw engaging member projects radially from the distal end of the inner sleeve and is configured to engage an extension coupling surface on the outer sleeve upon relative rotation of the inner and outer sleeves. A securement member including cooperative surfaces is defined adjacent the distal end of the inner and outer sleeves that is operable upon relative rotation of the inner sleeve and outer sleeve to radially secure the sleeves together to thereby maintain the engagement of the screw engaging member and the bone screw.
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