Bone screw with multiple thread profiles for far cortical locking and flexible engagement to a bone

摘要

Osteosynthesis constructs for treating bone fractures and bone screws for use in such systems are disclosed. The bone screws include a threaded front section configured for engagement with cortical bone, a threaded mid-section and an unthreaded neck section configured for limited movement within the near cortex of the bone. Osteosynthesis constructs of the type disclosed promote secondary healing by allowing for substantially parallel motion at the near and far cortex within the effective motion range for callus formation.

主权项

1. A bone screw comprising:
a head portion; and a shaft portion, the shaft portion including:
an unthreaded neck section;a threaded mid-section extending from a first end to a second end, the threaded mid-section having a first thread profile that extends from the first end to the second end and a first core diameter;a threaded front section distal to the threaded mid-section, the threaded front section having a second thread profile different from the first thread profile and a second core diameter greater than the first core diameter; andan expanded core section positioned distal to the unthreaded neck section, the expanded core section having a third core diameter that is greater than the first core diameter and the second core diameter.