Bone fastener and methods of use

A spinal implant system comprising:

• at least one bone fastener comprising:
• a receiver defining a first longitudinal axis and including spaced apart arms that include an inner surface of the receiver, at least a portion of the inner surface being threaded and engageable with a setscrew, the receiver further including a distal collar having an inner surface that defines a first lateral opening and a second lateral opening spaced apart from the first lateral opening, the inner surface of the collar including a first circumferential rim and a second circumferential rim spaced apart from the first circumferential rim,
• a saddle extending between a first end and a second end, the saddle including a through opening and defining a first surface configured for slidable engagement with the inner surface of the receiver along an arcuate path, the saddle further defining a second concave surface that defines an implant cavity with the receiver, the implant cavity defining a second axis transverse to the first longitudinal axis and being configured for disposal of an implant,
• a cap configured for fixed engagement with the distal collar, the cap including an inner surface that defines an inner cavity configured for disposal of the collar, the cap further including a first inwardly oriented tab that includes a first planar surface and a second inwardly oriented tab that includes a second planar surface, and
• a tissue penetrating shaft extending between a first end and a second end defining a third longitudinal axis, the first end of the shaft including a head being engageable with the tabs in a configuration to retain the shaft with the receiver and defining a tool socket configured for alignment with the through opening, the head including a first planar surface being oriented in a first direction to engage the first planar surface of the first tab, a second planar surface being oriented in a second direction to engage the second planar surface of the second tab and an arcuate surface disposed therebetween, the planar surfaces being engageable in a configuration to prevent rotation of the shaft relative to the receiver and the cap about the third longitudinal axis, the arcuate surface being engageable and moveable relative to the receiver;
• and
• a vertebral rod,
• wherein the bone fastener is movable between a first configuration such that the receiver is selectively rotatable relative to the shaft in a transverse plane of a body and the saddle is selectively rotatable relative to the receiver in a sagittal plane of the body between a first movable limit defined by engagement of the first end of the saddle with the arcuate surface and a second movable limit defined by engagement of the second end of the saddle with the arcuate surface, and a second configuration such that the setscrew applies a force to the rod disposed in the implant cavity and the rod engages the concave surface of the saddle to fix the bone fastener in an orientation.

A method for treating a spine disorder, the method comprising the steps of:

• providing a bone fastener comprising:
• a proximal portion including an inner surface and an outer surface having an extension that includes an inner surface defining at least one projection,
• a pivoting member being moveable relative to the inner surface of the proximal portion, the pivoting member including a first surface that defines an implant cavity with the inner surface of the proximal portion and a second surface,
• a component engageable with the proximal portion and including an inner surface that defines an inner cavity configured for disposal of the extension, the component further including at least one planar surface, and
• a distal portion defining a longitudinal axis and having a first end and a second end configured to penetrate tissue, the first end including at least one planar surface configured to engage the at least one planar surface of the component;
• attaching the distal portion with vertebrae;
• providing a vertebral rod disposed in an orientation;
• and
• selectively rotating the proximal portion relative to the distal portion in a first plane of a body, and selectively rotating the pivoting member relative to the proximal portion in a second plane of the body, to the orientation to dispose the rod in the implant cavity.