Polyaxial bone anchor assembly with one-piece closure, pressure insert and plastic elongate member
DCFirst Claim
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1. In a medical implant assembly having at least one polyaxial bone screw attached to a longitudinal connecting member, the bone screw having a receiver with a channel, the improvement wherein:
- a) at least a portion of the longitudinal connecting member is sized and shaped to be received in the receiver channel; and
further comprising;
b) a compression insert directly engaging both the longitudinal connecting member and a shank of the polyaxial bone screw, the insert having a base, a pair of opposed arms with outer receiver engaging portions, and the opposed arms defining a through channel with a lower connecting member seating surface;
whereinc) the compression insert is top-loadable in the receiver in a first orientation, wherein, when in the first orientation, the compression insert through channel is substantially perpendicular to the receiver channel, and then rotated to a second orientation, such that the compression insert through channel is substantially parallel to the receiver channel and cooperating receiver portions snap into the receiver engaging portions.
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Abstract
A medical implant assembly includes a polyaxial bone anchor having a shank, a receiver, a lower compression insert with planar surfaces for closely receiving an elongate connecting member with planar surfaces and a one-piece closure structure. The connecting member is made from a polymer. The closure structure engages both the connecting member and the insert with the engagement between the closure structure and the insert securely locking the polyaxial mechanism even if the connecting member exhibits creep.
1182 Citations
32 Claims
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1. In a medical implant assembly having at least one polyaxial bone screw attached to a longitudinal connecting member, the bone screw having a receiver with a channel, the improvement wherein:
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a) at least a portion of the longitudinal connecting member is sized and shaped to be received in the receiver channel; and
further comprising;b) a compression insert directly engaging both the longitudinal connecting member and a shank of the polyaxial bone screw, the insert having a base, a pair of opposed arms with outer receiver engaging portions, and the opposed arms defining a through channel with a lower connecting member seating surface;
whereinc) the compression insert is top-loadable in the receiver in a first orientation, wherein, when in the first orientation, the compression insert through channel is substantially perpendicular to the receiver channel, and then rotated to a second orientation, such that the compression insert through channel is substantially parallel to the receiver channel and cooperating receiver portions snap into the receiver engaging portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. In a medical implant assembly having at least one polyaxial bone screw attached to a longitudinal connecting member, the improvement wherein:
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a) the connecting member is at least partially deformable; and further comprising; b) a compression insert engaging directly on the longitudinal connecting member and also engaging directly on a bone screw shank of the polyaxial bone screw, the insert having one of a flat lower planar connecting member seating surface and a lower radiused connecting member seating surface;
whereinc) a receiver having structure cooperating with the compression insert, the structure directly engaging the insert and aligning a connecting member receiving channel of the insert with a through channel of the receiver; and
whereind) the structure directly engaging the insert is a first structure being at least one of a first pressure tab and a first groove, the insert having a second structure being at least one of a second groove cooperating with the first pressure tab and a second pressure tab cooperating with the first groove.
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23. In a polyaxial bone screw having a shank in pivotal relationship with a receiver having a channel for receiving a longitudinal connecting member and a closure top, the improvement comprising:
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a) an insert having a base, opposed upwardly extending arms with outwardly extending flanges, each arm having a substantially flat, planar surface for receiving and engaging substantially flat, planar surfaces of the longitudinal connecting member, and at least one outer recessed receiver engaging portion for cooperatively engaging an inwardly biased receiver portion, the insert base being in direct engagement with the bone screw shank and the flanges being in direct engagement with the closure top;
whereinb) the insert is top-loadable in the receiver in a first orientation, wherein the arm planar surfaces are substantially perpendicular to the receiver channel, and then rotatable to a second orientation so as to align the arm planar surfaces with the receiver channel. - View Dependent Claims (24, 25, 26, 27)
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28. In a polyaxial bone anchor assembly having a closure top, a bone screw shank and a receiving member that receives a pressure insert, and a longitudinal connecting member, the improvement wherein:
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a) the closure top is of single piece construction and the closure top directly engages both the longitudinal connecting member and a pair of upright arms of the pressure insert, the pressure insert directly engaging both the connecting member and the bone screw shank; b) the pressure insert is top-loaded in the receiving member in a first orientation, such that a through channel of the pressure insert is substantially perpendicular to a through channel of the receiving member, and then the pressure insert is rotated to a second orientation so as to position a flange of the upright arms within an inner recess of the receiving member and to thereby align the pressure insert through channel with the receiving member through channel; and
whereinc) a recessed relief surface of the insert receives material flow of a longitudinal connecting member received in the aligned insert and receiver through channels when the closure top engages the received longitudinal connecting member. - View Dependent Claims (29)
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30. In a polyaxial bone screw having a shank in pivotal relationship with a receiver having a channel for receiving a longitudinal connecting member and a closure top, the improvement comprising:
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a) an insert having a base, opposed upwardly extending arms with outwardly extending flanges, and a plurality of substantially flat, planar surfaces for receiving and engaging substantially flat, planar surfaces of the longitudinal connecting member, the insert base being in direct engagement with the bone screw shank and the insert flanges being in direct engagement with the closure top; and b) a groove formed in at least one of the insert flanges, the groove receiving a portion of the bone screw receiver, the bone screw receiver being a spring tab;
whereinc) the insert is top-loadable in the receiver in a first orientation, wherein the insert planar surfaces are substantially perpendicular to the receiver channel, and then rotatable to a second orientation so as to align the insert planar surfaces with the receiver channel.
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31. In a medical implant assembly having at least one polyaxial bone screw attached to a longitudinal connecting member, the bone screw having a receiver with a channel, the improvement wherein:
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a) at least a portion of the longitudinal connecting member is sized and shaped to be received in the receiver channel;
the assembly further comprising;b) a compression insert directly engaging both the longitudinal connecting member and a shank of the polyaxial bone screw, the insert having a base, a pair of opposed arms with receiver engaging portions, a lower connecting member seating surface, and a connecting member receiving channel;
whereinc) the insert is top-loadable in the receiver in a first orientation, wherein when in the first orientation in insert arms are substantially perpendicular to the receiver channel, and then rotated to a second orientation, such that the insert arms are substantially parallel to the receiver channel; d) the receiver has an integral alignment structure cooperating with the insert, the receiver alignment structure directly engaging the insert and aligning the insert connecting member receiving channel with the receiver channel, the receiver alignment structure being a first structure that is at least one of a first pressure tab and a first groove; and e) the insert has a second structure that is at least one of a second groove cooperating with the first pressure tab and a second pressure tab cooperating with the first groove.
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32. In a medical implant assembly having at least one polyaxial bone screw attached to a longitudinal connecting member, the bone screw having a receiver with a channel, the improvement wherein:
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a) at least a portion of the longitudinal connecting member is sized and shaped to be received in the receiver channel;
the assembly further comprising;b) a compression insert directly engaging both the longitudinal connecting member and a shank of the polyaxial bone screw, the compression insert having a base, a pair of opposed arms with receiver engaging portions, and a lower connecting member seating surface;
whereinc) the compression insert is top-loadable in the receiver in a first orientation, wherein when in the first orientation the compression insert arms are substantially perpendicular to the receiver channel, and then rotated to a second orientation, such that the compression insert arms are substantially parallel to the receiver channel; and a) the receiver includes integral spring tab structures sized and shaped to cooperate with the compression insert so as to block rotation of the compression insert from the second orientation to the first orientation.
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Specification