Spinal hook
First Claim
1. A spinal hook for interengaging a rod in the human spine comprising a body which has a rod-receiving bore therethrough, a connecting portion and a shoe, the connecting portion extending along a plane approximately normal to the axis of the bore and joined with the body in a first joint and the shoe extending in a plane from the connecting portion terminating in a trip on one end and joined to the connecting portion in a second joint on the opposite end from the tip, the surface of the body facing the shoe having a rounded outside surface to avoid laminar impingement from hook body corners and to allow the body to fit closer to a vertebra to which the hook is attached and the top surface of the body being flat to allow secure articulation with a hook holding clamp.
4 Assignments
0 Petitions
Accused Products
Abstract
This invention provides a spinal hook comprising a body having a rod receiving bore therethrough, a connecting portion and a shoe portion, the connecting portion extending along a plane approximately normal to the axis of the base and the shoe portion extending in a plane from the connecting portion and terminating in a tip on one end and joined to the connecting portion on the other end. Preferably, the side of the body facing the shoe portion has a convex curved outer surface to allow a closer fit to a vertebra to which the hook is attached. In preferred embodiments of the invention, the tip of the shoe is disposed closer to the body than the remainder of the shoe by either forming an acute angle between the shoe and the connecting portion or bending the tip of the shoe. The shoe may be tapered in both width and thickness and the connecting portion may be tapered in width from the body to the shoe to provide better fit between the hook and the vertebrae. The body is provided with one non-round slot or a plurality of holes on at least one side thereof to facilitate gripping and insertion of the hook. A holder adapted for use in connection with the present hook is also provided.
85 Citations
24 Claims
- 1. A spinal hook for interengaging a rod in the human spine comprising a body which has a rod-receiving bore therethrough, a connecting portion and a shoe, the connecting portion extending along a plane approximately normal to the axis of the bore and joined with the body in a first joint and the shoe extending in a plane from the connecting portion terminating in a trip on one end and joined to the connecting portion in a second joint on the opposite end from the tip, the surface of the body facing the shoe having a rounded outside surface to avoid laminar impingement from hook body corners and to allow the body to fit closer to a vertebra to which the hook is attached and the top surface of the body being flat to allow secure articulation with a hook holding clamp.
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13. A spinal hook for interengaging a rod in the human spine comprising a body which has a rod receiving bore therethrough, a connecting portion and a shoe, the connecting portion extending along a plane approximately normal to the axis of the bore and joined with the body in a first joint, and the shoe portion extending in a plane from the connecting portion terminating in a tip on one end and joined to the connecting portion by a second joint on the opposite end from the trip, the second joint having a radius of curvature of less than 1/3 of the length of the connecting portion as measured from the point where the surface of the body facing the shoe portion meets the connecting portion to the exterior surface of the shoe portion.
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14. A spinal hook for interengaging a rod in the human spine comprising a body which has a rod receiving bore therethrough, a connecting portion and a shoe, the connecting portion extending along a plane approximately normal to the axis of the bore and joined with the body in a first joint, and the shoe portion extending in a plane from the connecting portion terminating in a tip portion on one end and joined to the connecting portion by a second joint on the opposite end from the tip, the body having provided on at least one side thereof at least one non-round slot or a plurality of gripping holes designed to mate with corresponding locating pins on a gripping tool and the holes or slot having a configuration which prevents relative movement between the tool and the hook when the tool and the hook when the tool is gripping the hook.
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15. A spinal hook for interengaging a rod in the human spine comprising a body which has a rod receiving bore therethrough, a connecting portion and a shoe, the connecting portion extending along a plane approximately normal to the axis of the bore and joined with the body in a first joint, and the shoe portion extending in a plane from the connecting portion terminating in a tip portion on one end and joined to the connecting portion by a second joint on the opposite end from the tip, the shoe portion having a width in its plane which tapers to a reduced dimension from the second joint to the tip portion.
- 17. A spinal hook for interengaging a rod in the human spine comprising a body which has a rod receiving bore therethrough, a connecting portion and a shoe, the connecting portion extending along a plane approximately normal to the axis of the bore and joined with the body in a first joint, and the shoe portion extending in a plane from the connecting portion terminating in a tip portion of one end and joined to the connecting portion by a second joint on the opposite end from the tip, the shoe portion forming an acute angle with the connecting portion so that the tip of the shoe is closer to the center axis of the rod receiving bore than the second joint so that the tip contacts the undersurface of the thoracic vertebral facet or lamina when the hook is affixed to a patient, the shoe portion being non-rotatable relative to the body.
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24. A spinal hook for interengaging a rod in the human spine comprising a body which has a rod-receiving bore therethrough, a connecting portion and a shoe, the connecting portion extending along a plane approximately normal to the axis of the bore and joined with the body in a first joint and the shoe extending in a plane from the connecting portion terminating in a tip on one end and joined to the connecting portion in a second joint on the opposite end from the tip, the second joint having a radius of curvature of less than 1/3 of the length of the connecting portion as measured from the point where the surface of the body facing the shoe portion meets the connecting portion to the exterior surface of the shoe portion, the connecting portion having a greater thickness at the first joint than at the second joint so as to define an inclined surface along the length of the connecting portion to facilitate intimate contact between the shoe and the undersurface of the lamina upon loading the hook.
Specification