Spinal fixation tool attachment structure
A tool set for implanting bone screws in a human spine, followed by the implantation of a rod into the bone screws includes end guide tools having flexible back wall flaps that receive opposite ends of the rod and intermediate guide tools that hold the rod in intermediate locations between the end guide tools. Both the end and intermediate guide tools include an attachment structure for operably connecting the guide tool to a bone screw. The attachment structure includes an undercut and/or recess so as to resist splaying and separation of the guide tool from an attached bone screw.
1. A medical implant configured to receive a rod within the medical implant, the medical implant comprising:
a head with a central bore having a longitudinal axis and including a rod-receiving channel at a top thereof for receiving the rod, the head comprising an exterior surface including a horizontal groove near the top thereof, the horizontal groove including an upper edge and a lower edge parallel to the upper edge, each of the upper edge and the lower edge extending horizontally from one of a front surface of the head and a back surface of the head, an entirety of the back surface is opposite and parallel to the front surface, wherein the horizontal groove further includes: a front edge directly connected to a first side edge of the front surface and a second side edge of the front surface; or a back edge directly connected to a first side edge of the back surface and a second side edge of the back surface, each of the second side edge of the front surface and the second side edge of the back surface adjacent to the rod-receiving channel, and wherein the front surface and the back surface are completely on the exterior surface; and
a closure receivable by the head for locking the rod within the rod-receiving channel, wherein, when the closure is received by the medical implant to lock the rod within the rod-receiving channel, the groove remains laterally open and the top of the head remains uncovered.
2. A bone attachment structure comprising:
a receiver defining a rod-receiving channel, the receiver comprising:
a top;
a front surface;
a back surface disposed opposite and parallel to the front surface;
a first side surface extending between the front surface and the back surface;
a second side surface disposed opposite the first side surface and extending between the front surface and the back surface;
a first laterally opening, horizontal, radiused groove located near the top of the receiver, the first groove extending from a front surface and laterally terminating on the first side surface, the first groove including a front edge on the front surface that is directly connected to a first side edge of the front surface and a second side edge of the front surface, the second side edge of the front surface adjacent to the rod-receiving channel; and
a second laterally opening, horizontal, radiused groove located near the top of the receiver, the second groove extending from the back surface and laterally terminating on the second side surface, the second groove including a back edge on the back surface that is directly connected to a first side edge of the back surface and a second side edge of the back surface, the second side edge of the back surface adjacent to the rod-receiving channel,
wherein each of the front surface, the back surface, the first side surface, and the second side surface are completely on an exterior surface of the receiver.
3. A medical implant comprising:
a head with a central bore having a longitudinal axis and including a rod receiving channel opening at a top thereof;
a circumferentially extending groove formed in the head near the top thereof, the groove adapted to receive a manipulation tool structure, wherein the groove horizontally extends from a front surface of the head to a back surface of the head, an entirety of the back surface opposite and parallel to the front surface, the groove including an upper edge and a lower edge parallel to the upper edge, the upper edge and the lower edge extending horizontally and circumferentially about the head, wherein the groove further includes: a front edge that is connected to a first side edge of the front surface and a second side edge of the front surface; or a back edge that is connected to a first side edge of the back surface and a second side edge of the back surface, each of the second side edge of the front surface and the second side edge of the back surface adjacent to the rod-receiving channel, wherein the front surface and the back surface are completely on an exterior surface; and
a medical implant closure;
wherein the head includes an inner surface adapted to engage the medical implant closure such that when the tool structure is received within the groove, the medical implant closure is insertable into the rod receiving channel and, when the medical implant closure is inserted into the rod receiving channel, the top of the head remains uncovered.
4. The medical implant of claim 3 , wherein the head includes a first arm and a second arm defining the rod receiving channel, wherein the circumferentially extending groove is formed in each of the first arm and the second arm to form a first circumferentially extending groove and a second circumferentially extending groove.
5. The medical implant of claim 4 , wherein the first and the second circumferentially extending grooves each have an open end formed at one longitudinally extending edge of the first arm and the second arm respectively, the open end adjacent to the rod receiving channel.
6. The medical implant of claim 4 , wherein the first arm and the second arm each have a facet adjacent the first and second circumferentially extending grooves respectively each facet engageable with a manipulation tool.
7. The medical implant of claim 3 , wherein each of the second side edge of the front surface and the second edge of the back surface is immediately adjacent to the rod-receiving channel.