Bone anchor receiver with longitudinally extending tool attachment structures
A polyaxial bone screw assembly includes a threaded shank body having an integral shank head receivable in a one-piece receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. A compression insert (some with an independent tool lock, lock and release feature and/or friction fit feature) and a split retaining ring articulatable with respect to both the shank head and the receiver (prior to locking) cooperate with the receiver to provide for pop- or snap-on assembly of the shank with the receiver either prior to or after implantation of the shank into a vertebra.
1. A bone anchor receiver for securing an elongate rode to a bone anchor, the bone anchor receiver comprising:
a base, and
opposed spaced-a-part upright arms extending upward from the base to define an upward opening channel defined between the upright arms and having a first side opening and a second side opening, each upright arm including:
an outer arm surface facing outward and on an opposite side of the upright arm from the channel,
a top surface facing upward and extending between the respective outer arm surface and the channel; and
first and second upward extending V-shaped grooves extending upwardly to intersect the respective top surface, the first upward extending V-shaped groove being adjacent the first side opening and the second upward extending V-shaped groove being adjacent the second side opening,
wherein each upward extending V-shaped groove is further defined by two planar surfaces forming an acute angle therebetween.
2. The bone anchor receiver of claim 1 , wherein the V-shaped grooves are formed in the outer arm surface of each upright arm and spaced from the channel.
3. The bone anchor receiver of claim 1 , further comprising substantially planar outwardly-facing surfaces formed into the receiver arms adjacent the first side opening and the second side opening.
4. The bone anchor receiver of claim 3 , wherein the V-shaped grooves are spaced from the channel by the substantially planar outwardly-facing surfaces.
5. The bone anchor receiver of claim 3 , wherein the substantially planar outwardly-facing surfaces extend below the channel and into the base of the receiver.
6. A bone anchor receiver for securing an elongate rode to a bone anchor, the bone anchor receiver comprising:
a base, and
opposed spaced-a-part upright arms extending upward from the base to define an upward opening channel defined between the upright arms and having a front side opening and a rear side opening, each upright arm including:
an outer arm surface facing outward and on an opposite side of the upright arm from the channel;
a top surface facing upward and extending between the respective outer arm surface and the channel;
front and rear outwardly-facing planar surfaces formed into each receiver arm adjacent the front side opening and the rear side opening, respectively, and defining an outer perimeter of the channel; and
upward extending V-shaped grooves formed into each receiver arm at the front and rear planar surfaces and extending upwardly to intersect the respective top surface.
7. The bone anchor receiver of claim 6 , wherein the upward extending V-shaped grooves are spaced from the channel by the front and rear planar surfaces.
8. The bone anchor receiver of claim 6 , wherein each upward extending V-shaped groove is further defined by two planar surfaces forming an acute angle therebetween.
9. The bone anchor receiver of claim 6 , wherein the front and rear planar surfaces extend below the channel and into the base of the receiver.