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Self-holding screw head
专利权人:
Stryker European Holdings I; LLC
发明人:
Nils Zander,Manfred Wieland
申请号:
US15399233
公开号:
US10426535B2
申请日:
2017.01.05
申请国别(地区):
US
年份:
2019
代理人:
摘要:
A screw insertion system has a screw having a threaded shaft and a head. The head has a conically tapered outer surface, the taper increasing in distance from a central longitudinal axis of the screw from a free end of the head towards a larger diameter adjacent the connection between the head and the threaded shaft. The conically tapered head outer surface has preferably two helically extending partially rounded threads. The head has a drive element for engaging a driver. A tubular screw holder has an outer surface and internal bore extending between a leading end and a trailing end for receiving the screw. The leading end having a conically tapered inner threaded portion for engaging the conically tapered outer thread of the screw head. The tubular screw holder outer surface having a diameter less than or equal to the maximum diameter of the conically tapered head.
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