Posterior cross connector assembly

摘要

A spinal rod cross connector assembly for connection to adjacent spinal rods provides polyaxial positioning of polyaxial heads of the cross connector assembly relative to each spinal rod and which allows adjustment and fixation of the span of a cross connector or arm of the cross connector assembly between the two polyaxial heads through movement of the cross member relative to only one polyaxial head. Each polyaxial head has a clamp that provides attachment to the respective spinal rod and which allows the body of the polyaxial head to rotate relative thereto. Fixation of the orientation of a polyaxial head is achieved through placement and interaction of a set screw in the polyaxial head. The arm is preferably integral with and extends from a lateral side of one of the polyaxial heads. The second one of the polyaxial heads receives the arm and allows length adjustment relative thereto.

主权项

1. A spinal device for maintaining a spatial relationship between first and second spinal rods, the spinal device comprising:
a first polyaxial clamp assembly configured for attachment to a first spinal rod, the first polyaxial clamp assembly having:
a first housing with a first configured interior and a first bore extending from an upper surface of the first housing to a lower surface of the first housing and extending through the first configured interior, anda first clamp situated within the first configured interior and configured to clasp the first spinal rod when a first set screw is received in the first bore through the upper surface of the first housing and contacts the first clamp, and fix an orientation of the first housing relative to the first spinal rod, the first clamp comprising a one-piece clamp and has a convex upper surface that interfaces with a concave lower surface of the first set screw when the first set screw is received in the first bore of the first housing to provide clamping of the first clamp onto the first spinal rod; an arm extending from the first housing; and a second polyaxial clamp assembly configured for attachment to a second spinal rod, the second polyaxial clamp assembly having:
a second housing with a second configured interior, a second bore extending from an upper surface of the second housing to a lower surface of the second housing and extending through the second configured interior, and a third bore extending from a first lateral side of the second housing to a second lateral side of the second housing, the arm adjustably received in the third bore, anda second clamp situated within the second configured interior and configured to clasp the second spinal rod when a second set screw is received in the second bore through the upper surface of the second housing, contacts the arm which then contacts the second clamp, to fix both the arm relative to the second housing and an orientation of the second housing relative to the second spinal rod, wherein the second clamp comprises a one-piece clamp and has a convex upper surface that interfaces with a configured lower surface of the arm which, via an upper surface of the arm, interfaces with a lower surface of the second set screw when the second set screw is received in the second bore of the second housing to provide clamping of the second clamp onto the second spinal rod.