Multiaxial receivers with tether
Various multiaxial receivers for receiving at least one tether are disclosed. A multiaxial receiver may include a body having a U-shaped cavity configured to receive a longitudinal rod therein and a lower cavity configured to couple to a pedicle screw. The body may include a first aperture extending through a side surface of the body and defining a first passageway configured to permit a tether to pass therethrough in the horizontal direction. In some embodiments, the body may include a second aperture extending through the side surface of the body and defining a second passageway configured to permit the tether to pass therethrough in the horizontal direction. A set screw may be configured to be rotated from an open position in which the tether is permitted to pass through the first passageway and optionally through the second passageway to a closed position in which the tether is immobilized.
1. A multiaxial receiver, comprising:
a body having a U-shaped cavity configured to receive a longitudinal rod therein and a lower cavity configured to couple to a pedicle screw, the body extending in a vertical direction along a longitudinal axis and extending in a horizontal direction along a widthwise axis;
a side portion including a first aperture extending through a side surface thereof and defining a first passageway configured to permit a tether to pass therethrough in the horizontal direction; and
a threaded aperture extending through an upper surface of the side portion and into the first passageway;
a set screw disposed in the threaded aperture,
wherein the set screw is configured to be rotated from an open position in which the tether is permitted to pass through the first passageway to a closed position in which the tether is immobilized within the first passageway;
wherein a medial portion of the first passageway comprises a circular indentation having a size and shape corresponding to a size and shape of a flattened bottom surface of the set screw.
2. The multiaxial receiver of claim 1 , wherein the lower cavity is configured to mate to a head of the pedicle screw that permits the multiaxial receiver to be angled with respect to an extension direction of the pedicle screw.
3. The multiaxial receiver of claim 1 , wherein the flattened bottom surface is a high friction surface.
4. The multiaxial receiver of claim 1 , wherein the medial portion of the first passageway comprises a flattened bearing surface.
5. The multiaxial receiver of claim 1 , wherein the first aperture comprises a flared out portion configured to facilitate passing the tether therethrough.
6. The multiaxial receiver of claim 5 , wherein:
the medial portion of the first passageway comprises a flattened bearing surface; and
the flared out portion comprises at least one ramped surface sloping towards the flattened bearing surface.
7. The multiaxial receiver of claim 1 , wherein:
the medial portion of the first passageway comprises a flattened bearing surface;
a first side of the first aperture comprises a first flared out portion configured to facilitate passing the tether therethrough and a second side of the first aperture comprises a second flared out portion configured to facilitate passing the tether therethrough;
the first flared out portion comprises at least one first ramped surface sloping towards the flattened bearing surface; and
the second flared out portion comprises at least one second ramped surface sloping towards the flattened bearing surface.
8. The multiaxial receiver of claim 1 , wherein the side portion further includes a second aperture extending through the side surface thereof and defining a second passageway configured to permit a tether to pass therethrough in the horizontal direction.
9. A multiaxial receiver, comprising:
a body having a U-shaped cavity configured to receive a longitudinal rod therein and a lower cavity configured to couple to a pedicle screw, the body extending in a vertical direction along a longitudinal axis and extending in a horizontal direction along a widthwise axis;
a side portion of the body comprising
a first protrusion extending in the vertical direction and having a first through hole,
a second protrusion extending in the vertical direction, having a second through hole, and being spaced apart from the first protrusion, and
an open space between the first and second protrusions,
wherein the first through hole, second through hole and open space are collectively configured to permit a tether to pass through the side portion of the body in the horizontal direction; and
at least one ferrule disposed in at least one of the first through hole and the second through hole;
wherein the at least one ferrule is configured to be crimped from an open position in which the tether is permitted to pass through the side portion of the body to a closed position in which the at least one ferrule is collapsed and the tether is immobilized within the side portion of the body.
10. The multiaxial receiver of claim 9 , wherein the at least one ferrule comprises a first ferrule disposed in the first protrusion and a second ferrule disposed in the second protrusion.
11. The multiaxial receiver of claim 10 , wherein at least a portion of each of the first ferrule and the second ferrule extends into the open space between the first and second protrusions.
12. The multiaxial receiver of claim 11 , wherein the first ferrule and the second ferrule are configured to be crimped via the open space.
13. The multiaxial receiver of claim 9 , wherein:
a first end of the at least one ferrule extends from the first protrusion in a first direction away from the open space;
a second end of the at least one ferrule extends in an opposing second away from the open space; and
each of the first and second ends of the at least one ferrule is configured to be crimped.
14. A multiaxial receiver, comprising:
a body having a U-shaped cavity configured to receive a longitudinal rod therein and a lower cavity configured to couple to a pedicle screw, the body extending in a vertical direction along a longitudinal axis and extending in a horizontal direction along a widthwise axis;
a first aperture extending through a side surface of the body and defining a first passageway configured to permit a tether to pass therethrough in the horizontal direction;
a second aperture extending through the side surface of the body and defining a second passageway configured to permit the tether to pass therethrough in the horizontal direction;
a threaded aperture extending through an upper surface of the body and into the first passageway and the second passageway; and
a set screw disposed in the threaded aperture,
wherein the set screw is configured to be rotated from an open position in which the tether is permitted to pass through the first passageway and optionally through the second passageway to a closed position in which the tether is immobilized within the first passageway and/or the second passageway;
wherein the set screw includes a flattened bottom surface, and a medial portion of the first passageway and a medial portion of the second passageway share a common cavity having a flattened bearing surface;
wherein the flattened bearing surface comprises a circular indentation having a size and shape corresponding to a size and shape of the flattened bottom surface of the set screw.
15. The multiaxial receiver of claim 14 , wherein the lower cavity is configured to mate to a head of the pedicle screw that permits the multiaxial receiver to be angled with respect to an extension direction of the pedicle screw.
16. The multiaxial receiver of claim 14 , further comprising:
the at least one tether;
the pedicle screw; and
the longitudinal rod,
wherein the pedicle screw, the body, and the longitudinal rod are configured to be tightened before the set screw is configured to be rotated to the closed position in which the tether is immobilized within the first passageway and/or the second passageway.