Segmental orthopaedic device for spinal elongation and for treatment of scoliosis
An orthopaedic device to realign bone segments comprises first and second attachment members and a spacer member. The first attachment member is attached to a first rib bone or first transverse process of a vertebra. The second attachment member is attached to a second rib bone or second transverse process of a vertebra adjacent to the first rib bone or the first transverse process. The spacer member is positioned between the first and second attachment members. The spacer member provides distraction between the first and second rib bones or transverse processes to realign the rib bones. The spacer member is releasably connected to the first and second attachment members. The attachment members comprise a clamp and screw combination.
1. An attachment member for an orthopaedic device for realigning bone segments, the attachment member comprising:
a connector member;
a clamp to attach to a rib bone, a lamina, or a transverse process of a vertebra, the clamp including an upper arm, a lower arm, and a hinge;
a screw inserted into a first opening in the clamp, the screw including a screw head and a first longitudinal axis that extends along a length of the screw; and
a second opening that completely extends through at least one of the screw head and the connector member along a second longitudinal axis that extends in a direction generally perpendicular to the first longitudinal axis,
wherein the second opening is disposed on a same side of the first opening as the screw head, and the second opening is configured to receive one of a spacer member and a rod extending in the direction generally perpendicular to the first longitudinal axis,
wherein the connector member is integral with and thereby rotationally fixed relative to the screw head,
wherein the screw is configured to, upon tightening, advance through the first opening in the clamp, to fix into the rib bone, the lamina, or the transverse process to prevent rotational movement or sliding of the clamp along the rib bone, the lamina, or the transverse process, and
wherein the clamp includes a prominence, the prominence being positioned adjacent to the hinge such that as the screw is tightened to advance through the first opening in the clamp to fix into the rib bone, the lamina, or the transverse process, the screw head pushes against the prominence to force the upper and lower arms to pivot to a clamped position.
2. The attachment member of claim 1 , wherein the connector member is releasably connectable to the spacer member.
3. The attachment member of claim 2 , wherein the connector member includes the second opening to engage with the spacer member.
4. The attachment member of claim 2 , wherein the connector member includes the second opening and wherein the second opening includes a channel to allow the rod to slide through.
5. The attachment member of claim 4 , wherein the rod is rigid.
6. The attachment member of claim 4 , wherein the rod is flexible.
7. The attachment member of claim 4 , wherein the rod is expandable.
8. The attachment member of claim of claim 4 , wherein the rod spans multiple spinal levels.
9. The attachment member of claim 2 , wherein the connector member includes a protrusion configured to engage with the spacer member.
10. The attachment member of claim 1 , further comprising a biocompatible coating to enhance fixation of the attachment member to bone.
11. The attachment member of claim 10 , wherein the biocompatible coating comprises hydroxyapatite.
12. The attachment member of claim 1 , wherein the attachment member includes a biocompatible material to enhance fixation of the attachment member to bone.
13. The attachment member of claim 12 , wherein the biocompatible material comprises hydroxyapatite.
14. The attachment member of claim 1 , wherein the clamp is configured to attach to opposite sides of the rib bone.
15. The attachment member of claim 1 , wherein the screw and the screw head form a unitary piece.