In-situ additive expandable implants
Embodiments of the present disclosure include in-situ formed or in-situ-manufactured expandable cages, expandable implants, and additive-manufacturing systems for printing spinal implants in-situ, and methods for printing the same. Some embodiments may include a robotic subsystem including scanning and imaging equipment configured to scan a patient's anatomy. Some embodiments may further include an armature having a dispensing component configured to dispense at least one printing material and a controller. The controller may be configured to control the scanning and imaging equipment to determine a target alignment of a patient's spine, and develop in-situ-forming instructions including an in-situ relocation plan. In some embodiments, the in-situ-forming instructions may be based on the target alignment of the patient's spine and an interbody access space which may only partially provide access to a disc space between adjacent vertebra of the patients spine. The controller may execute the in-situ-forming instructions to form an interbody cage.
1. A method for printing a spinal implant in-situ, comprising:
positioning, in a first positioning step, a dispensing component within or adjacent to an interbody access space that provides access to an intervertebral disc space defined by a first vertebra and a second vertebra of a patient;
printing, in a first printing step, a first cage within or adjacent to the interbody access space;
positioning, in a second positioning step, the first cage in a first position within the intervertebral disc space and adjacent the interbody access space;
printing, in a second printing step, a second cage within or adjacent to the interbody access space; and
positioning, in a third positioning step, the second cage in a second position within the intervertebral disc space and adjacent the interbody access space,
wherein the third positioning step causes the second cage to contact the first cage, urging the first cage farther into the intervertebral disc space and in a third position.
2. The method of claim 1 , further comprising:
providing an additive-manufacturing system including a robotic subsystem and a controller apparatus having a processor and a non-transitory computer-readable medium storing in-situ-forming instructions; and
executing in-situ-forming instructions, to control the robotic subsystem to perform the positioning and printing steps.
3. The method of claim 2 , wherein:
the additive-manufacturing system further comprises a provisioning component affecting flow of printing material to or through the dispensing component; and
the controller apparatus, in the printing step, controls the provisioning component based on dispensing-component movement data to control a rate at which the printing material is dispensed.
4. The method of claim 1 , wherein each printing step comprises depositing a first layer of a first type of printing material and depositing a second layer of a second type of printing material on the first layer, and a size of the first cage corresponds to a size of the interbody access space.
5. The method of claim 1 , wherein the first cage is wedge-shaped, and, in the third positioning step, the second cage urges the first cage against the first vertebra to adjust an angle of inclination between the first vertebra and the second vertebra.
6. The method of claim 1 , further comprising:
printing, in a third printing step, a third cage within or adjacent to the interbody access space; and
positioning, in a fourth positioning step, the third cage in a fourth position within the intervertebral disc space and adjacent the interbody access space,
wherein the fourth positioning step urges the first and second cages farther into the intervertebral disc space, and
wherein the intervertebral disc space is substantially filled by the first, second, and third cages.
7. The method of claim 1 , wherein the second cage is wedge-shaped, and, in the third positioning step, the second cage urges the first vertebra and second vertebra away from one another to adjust an angle of inclination between the first vertebra and the second vertebra.
8. The method of claim 7 , further comprising:
printing, in a third printing step, a third cage within or adjacent to the interbody access space; and
positioning, in a fourth positioning step, the third cage in a fourth position within the intervertebral disc space and adjacent the interbody access space,
wherein the fourth positioning step urges the first and second cages farther into the intervertebral disc space, and
wherein the intervertebral disc space is substantially filled by the first, second, and third cages.
9. The method of claim 8 , wherein the third cage is wedge-shaped, and, in the fourth positioning step, the third and second cages urge the first vertebra and second vertebra farther away from one another to further adjust the angle of inclination between the first vertebra and the second vertebra.
10. The method of claim 1 , further comprising:
removing the first cage from the intervertebral disc space;
printing, in a third printing step, a third cage within or adjacent to the interbody access space; and
positioning, in a fourth positioning step, the third cage in a fourth position within the intervertebral disc space and adjacent the interbody access space,
wherein the fourth positioning step urges the second cage farther into the intervertebral disc space, and
wherein the intervertebral disc space is substantially filled by the second and third cages.