1. 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; and 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.
1. 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; and 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. 2. The improvement of claim 1 further comprising a closure having a first guide and advancement structure for mating engagement with a second guide and advancement structure located on the receiver arms, the closure having a frusto-conical lower surface and a domed bottom surface located adjacent to the lower surface, the domed bottom surface being in engagement with the longitudinal connecting member during an interim adjustment stage of assembly allowing slidable movement of the insert with respect to the receiver, at least one of the domed bottom surface and the frusto-conical surface being in fixed frictional engagement with the longitudinal connecting member when the closure is rotated downwardly in the receiver into a final assembled position wherein the longitudinal connecting member is in fixed frictional engagement with both the insert and the closure structure, the insert also being in fixed frictional engagement with the receiver.