Vertebral body replacement
The present invention involves a system and methods for assembling and implanting a vertebral body implant. The vertebral body implant includes, but is not necessarily limited to, an expandable core body and endplates that can be attached at both ends. Endplates of various shapes, sizes and angles are attachable to the expandable core in a plurality of positions so that a suitable vertebral body implant can be implanted between vertebrae from an anterior, anterior-lateral, lateral, posterior or posterior-lateral approach.
1. An implant for providing support between a first vertebra and a second vertebra in a space remaining after the removal of at least part of one vertebra, comprising:
an expandable body extending along a longitudinal axis from a first end to a second end, the expandable body having a transverse axis extending perpendicular to the longitudinal axis, a body length spanning from the first end to the second end, a central aperture spanning from the first end to the second end, and a ring member rotatable about the longitudinal axis to adjust the body length, the first end including a first end attachment feature having an outer profile and a plurality of threaded holes situated radially about the longitudinal axis;
a first endplate having a first surface opposing a second surface, said first endplate coupled to the expandable body via a first attachment feature on the first surface, the first attachment feature including a first receptacle configured to receive the outer profile of the first end and a screw opening extending through the second surface into the first receptacle, the first receptacle configured to receive the first attachment feature outer profile in a plurality of different orientations such that the first endplate is coupleable to the first end in a plurality of rotational positions relative to the transverse axis, the plurality of rotational positions comprising a first rotational position and a second rotational position, wherein the second rotational position is rotated 30 to 150 degrees from the first rotational position, with the screw opening aligning with one of the plurality of threaded holes in each of the plurality of positions and receiving a set screw therethrough to lock the first endplate in the selected position; and
a second endplate having a third surface opposing a fourth surface, said second endplate coupled to the expandable body via a second attachment feature on the third surface that mates with a second end attachment feature, said second attachment feature configured to couple with the second end attachment feature in a plurality of different orientations such that the second end plate is coupleable to the second end in a plurality of positions relative to the transverse axis.
2. The implant of claim 1 , wherein said second surface of said first endplate and said fourth surface of said second endplate are convexly curved.
3. The implant of claim 1 , wherein said first surface of the first endplate and said second surface of the first endplate are parallel to each other.
4. The implant of claim 1 , wherein said first surface of said first endplate and said second surface of said first endplate form an angle relative to each other.
5. The implant of claim 3 , wherein said third surface of the second endplate and said fourth surface of the second endplate are parallel to each other.
6. The implant of claim 3 , wherein said third surface of the second endplate and said fourth surface of the second end plate form an angle relative to each other.
7. The implant of claim 4 , wherein said third surface of the second endplate and said fourth surface of the second end plate form an angle relative to each other.
8. The implant of claim 4 , wherein the angle ranges from −4° to 7°.
9. The implant of claim 1 , wherein said first endplate and said second endplate have a length dimension greater than a width dimension.
10. The implant of claim 1 , wherein said first endplate and said second endplate are circular.
11. The implant of claim 9 , wherein said first endplate and said second endplate are dimensioned to span from one lateral aspect of a vertebral body endplate to another lateral aspect of the vertebral body endplate.
12. The implant of claim 1 , wherein said expandable body further comprises an inner core and an outer core, wherein said ring member is coupled to the inner core and the outer core such that rotation of the ring member causes the inner core to translate relative to the outer core and increases the body length between said first end and said second end of the expandable body.
13. An implant for providing support between a first vertebra and a second vertebra in a space remaining after the removal of at least part of one vertebra, comprising:
an expandable body extending along a longitudinal axis from a first end to a second end, the expandable body having a transverse axis extending perpendicular to the longitudinal axis, a body length spanning from the first end to the second end, a central aperture spanning from the first end to the second end, and a ring member rotatable about the longitudinal axis to adjust the body length, the first end including a first end attachment feature having an outer profile and a plurality of threaded holes situated radially about the longitudinal axis;
a first endplate having a first surface opposing a second surface, said first endplate coupled to the expandable body via a first attachment feature on the first surface, the first attachment feature including a first receptacle configured to receive the outer profile of the first end and a screw opening extending through the second surface into the first receptacle, the first receptacle configured to receive the first attachment feature outer profile in a plurality of different orientations such that the first endplate is coupleable to the first end in a plurality of rotational positions relative to the transverse axis, the plurality of rotational positions comprising a first rotational position, a second rotational position, and a third rotational position, with the screw opening aligning with one of the plurality of threaded holes in each of the plurality of positions and receiving a set screw therethrough to lock the first endplate in the selected position; and
a second endplate having a third surface opposing a fourth surface, said second endplate coupled to the expandable body via a second attachment feature on the third surface that mates with a second end attachment feature, said second attachment feature configured to couple with the second end attachment feature in a plurality of different orientations such that the second end plate is coupleable to the second end in a plurality of positions relative to the transverse axis.
14. The implant of claim 13 , wherein the plurality of rotational positions comprises a fourth rotational position, a fifth rotational position, and a sixth rotational position.
15. The implant of claim 14 , wherein the plurality of rotational positions comprises a seventh rotational position, an eighth rotational position, and a ninth rotational position.
16. The implant of claim 15 , wherein the plurality of rotational positions comprises a tenth rotational position, a eleventh rotational position, and a twelfth rotational position.
17. An implant for providing support between a first vertebra and a second vertebra in a space remaining after the removal of at least part of one vertebra, comprising:
an expandable body extending along a longitudinal axis from a first end to a second end, the expandable body having a transverse axis extending perpendicular to the longitudinal axis, a body length spanning from the first end to the second end, a central aperture spanning from the first end to the second end, and a ring member rotatable about the longitudinal axis to adjust the body length, the first end including a first end attachment feature having an outer profile and a plurality of threaded holes situated radially about the longitudinal axis, the outer profile comprising a generally sinusoidal or flower-shaped perimeter;
a first endplate having a first surface opposing a second surface, said first endplate coupled to the expandable body via a first attachment feature on the first surface, the first attachment feature including a first receptacle configured to receive the outer profile of the first end attachment feature and a screw opening extending through the second surface into the first receptacle, the first receptacle comprising a generally sinusoidal or flower-shaped perimeter substantially matching the outer profile of the first end attachment feature, the first receptacle configured to receive the first attachment feature outer profile in a plurality of different orientations such that the first endplate is coupleable to the first end in a plurality of positions relative to the transverse axis, the screw opening aligning with one of the plurality of threaded holes in each of the plurality of positions and receiving a set screw therethrough to lock the first endplate in the selected position; and
a second endplate having a third surface opposing a fourth surface, said second endplate coupled to the expandable body via a second attachment feature on the third surface that mates with a second end attachment feature, said second attachment feature configured to couple with the second end attachment feature in a plurality of different orientations such that the second end plate is coupleable to the second end in a plurality of positions relative to the transverse axis.
18. The implant of claim 17 , wherein said first endplate and said second endplate have a length dimension greater than a width dimension.
19. The implant of claim 18 , wherein said first endplate and said second endplate are dimensioned to span from one lateral aspect of a vertebral body endplate to another lateral aspect of the vertebral body endplate.
20. The implant of claim 17 , wherein said first endplate and said second endplate are circular.