Bone screw

摘要

There are disclosed embodiments of screws for use in orthopedic surgery, particularly in pediatric patients. In some embodiments, inner and outer implantable members are provided, with the outer implantable member threadable on the inner implantable member to provide compression on two or more bone parts. In some embodiments, screw members are provided with a threaded shaft, and the thread continues into the head of the screw member to enable the thread to remain in pediatric bone.

主权项

1. An orthopedic implant for compressing bone parts toward each other, comprising:
a first non-expandable implantable member having a shaft and a head, said shaft having an external thread adapted for anchoring in a first bone part, said external thread extending continuously along a length of said shaft and into a lower part of said head and at least partially along said head toward an upper part of said head, said head having an unthreaded outer diameter larger than a diameter of said external thread, said head having a first radius measured from the longitudinal axis to a first external side of said head that is smaller than a second radius measured from the longitudinal axis to a second external side of said head diametrically opposed to the first side, said first implantable member having a central longitudinal cannula extending through said shaft and said head, said cannula having an internal thread; a second implantable member having an elongated distal portion and a proximal end, said distal portion having an external thread engaged with said internal thread of said cannula of said first implantable member, said distal portion having a distal end extending from the distal end of said first implantable member and adapted to anchor in a second bone part; wherein turning said first implantable member threads said first implantable member into said first bone part as well as threading said first implantable member along said second implantable member and moving said distal end of said second implantable member toward said first implantable member.