Sagittal angle screw with integral shank and receiver
OwnerRoger P. Jackson, James L. Surberinventors
Life of this patent
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Abstract
A spinal bone screw has a receiver with upstanding arms forming a channel for receiving a longitudinal connecting member, such as a rod, the receiver being integral with a threaded shank. The receiver further includes inner surfaces in sliding engagement with an insert, the insert having a seating surface for the rod. The insert and rod being pivotable with respect to the bone screw in a single plane.
Claims29
In a spinal implant with a bone screw having a shank for implanting into bone, the bone screw capturing a longitudinal connecting member at an adjustable angle with respect to the shank, the improvement comprising:
- a) a receiver having a pair of spaced upstanding arms forming a channel for receiving the longitudinal connecting member, the receiver being integral with the shank, the receiver forming a cavity communicating with the channel, the cavity partially defined by a curved seating surface having a first radius, the receiver further having an arcuate pivot track formed in an inner surface of one of the upstanding arms, the pivot track being spaced from the seating surface, the pivot track having a second radius, the second radius originating at a pivot axis disposed perpendicular to and intersecting with a central axis of rotation of the shank;
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- b) an insert having a bottom curved surface sized and shaped for slidable engagement with the receiver seating surface, a projection in slidable engagement with the pivot track and a top surface sized and shaped for closely receiving the longitudinal connecting member.
A spinal bone screw pivotable with respect to a longitudinal connecting member in a single plane, the bone screw comprising:
- a) a shank having a thread;
- b) a receiver having a pair of spaced upstanding arms forming a channel for receiving the longitudinal connecting member, the receiver being integral with the shank, the receiver forming a cavity communicating with the channel, the receiver arms having opposed inner surfaces with opposed arcuate grooves, the grooves each defined in part by a radius originating at a pivot axis disposed perpendicular to and intersecting with a central axis of rotation of the shank;
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- c) a discrete insert located within the receiver cavity, the insert having a pair of opposed outwardly extending projections, each projection located within one of the arcuate grooves, the insert projections being slidable in the arcuate grooves, the insert having a seating surface in fixed, frictional engagement with the longitudinal connecting member.
A spinal bone screw pivotable in a single plane with respect to a longitudinal connecting member in the form of a rod, the bone screw comprising:
- a) a shank having a thread;
- b) a receiver having a pair of spaced upstanding arms forming a channel sized and shaped for receiving the rod, the receiver being integral with the shank, the receiver forming a cavity communicating with the channel, the cavity partially defined by a bottom partially cylindrical surface having a first radius, the receiver arms having opposed inner planar surfaces, each planar surface having an arcuate aperture communicating with an elongate groove, each groove being parallel to a central axis of rotation of the shank, each arcuate aperture being evenly spaced from the receiver bottom surface;
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- c) a discrete insert located within the receiver cavity, the insert having a bottom surface in sliding engagement with the receiver bottom surface, the insert further having a pair of outwardly extending projections, each projection located within one of the receiver arcuate apertures, the insert projections being captured in the receiver apertures, the insert having an upper seating surface sized and shaped for receiving and frictionally engaging the rod.
A spinal bone screw pivotable with respect to a longitudinal connecting member in a single plane, the bone screw comprising:
- a) a shank having a thread;
- b) a receiver having a pair of spaced upstanding arms forming a channel for receiving the longitudinal connecting member, the receiver being integral with the shank, the receiver forming a cavity communicating with the channel, the cavity partially defined by a bottom surface having a first radius, the radius originating at a pivot axis disposed perpendicular to and intersecting with a central axis of rotation of the shank;
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- c) a discrete insert captured within the receiver cavity, the insert having a bottom surface with a second radius in slidable engagement with the receiver bottom surface, the second radius being substantially equal to the first radius, the insert having a top surface sized and shaped for frictional engagement with the longitudinal connecting member,
Dependencies are inferred from the claim text.