Bone screw systems and methods of use

摘要

The distal bone screw segment of a bone screw system is driven into bone. In a first state, the assembly permits relative motion between its component parts in order to facilitate the placement and correct alignment of an interconnecting rod that is used to couple multiple bone screw systems and/or other orthopedic devices. In a second state, the assembly provides relative immobilization between the assembly components and the inter-connecting rod.

主权项

1. A bone fastener assembly, comprising:
an elongated interconnecting member; a bone fixation member comprising a first segment configured to be attached onto a skeletal bone and a second segment at least partially seated within an inner housing member; the inner housing member comprising a first seat configured to receive a segment of the elongated interconnecting member and a second seat configured to receive the second segment of the bone fixation member, the inner housing member being comprised of at least two movable members each forming at least a segment of the first seat and the second seat; and an outer housing member comprising a seat configured to receive at least a portion of the inner housing and a locking feature that is configured to transition the assembly from a first state to a second state; wherein in the first state, the bone fixation member is mobile relative to the elongated interconnecting member, and in the second state, the bone fixation member is immobilized relative to the elongated interconnecting member; wherein the locking feature is separated from direct abutment with the inner housing member; and wherein transition of the locking feature from the first to the second state produces an increase in a diameter of the first seat of the inner housing member and a reduction in a diameter of the second seat with immobilization of the bone fixation member therein.