INTERSPINOUS-INTERLAMINAR STABILIZATION SYSTEMS AND METHODS
Systems and methods are disclosed for maintaining spacing between a superior spinous process and a superior lamina, and an inferior spinous process and an inferior lamina of adjacent vertebrae of a spine. A system may include an implant having a proximal superior surface with a superior concavity shaped to receive the superior spinous process, a proximal inferior surface with an inferior concavity shaped to receive the inferior spinous process, a distal superior surface, distal to the proximal superior surface, that faces the superior lamina, and a distal inferior surface, distal to the proximal inferior surface, that faces the inferior lamina. The implant may further have a threaded member extending along a proximal-distal direction, that rotates to urge the implant to move from a retracted configuration to a deployed configuration by urging the distal superior surface and the distal inferior surface to move apart.
1 . A method for implanting an implant in a space between a superior spinous process and a superior lamina, and an inferior spinous process and an inferior lamina of adjacent vertebrae of a spine, the method comprising:
with the implant in a retracted configuration, inserting the implant into the space such that a proximal superior surface of the implant engages the superior spinous process and a proximal inferior surface of the implant engages the inferior spinous process; and
rotating a threaded member extending along a proximal-distal direction to urge the implant to move from the retracted configuration to a deployed configuration by urging a distal superior surface, distal to the proximal superior surface, and a distal inferior surface, distal to the proximal inferior surface, to move apart such that the distal superior surface engages the superior spinous process and/or the superior lamina and the distal inferior surface engages the inferior spinous process and/or the inferior lamina.
2 . The method of claim 1 , wherein:
the implant further comprises:
two superior wings extending superiorly from the proximal superior surface; and
two inferior wings extending inferiorly from the proximal superior surface;
the superior wings have superior tips;
the inferior wings have inferior tips;
the superior tips are displaced, along the proximal-distal direction, from the inferior tips; and
inserting the implant into the space comprises:
causing the superior spinous process to be received between the superior wings; and
causing the inferior spinous process to be received between the inferior wings.
3 . The method of claim 1 , wherein:
the implant comprises a wingless shape; and
inserting the implant into the space comprises inserting the implant through a cannula to pass the implant through soft tissues posterior to the space.
4 . The method of claim 1 , wherein:
the implant further comprises:
a superior member on which the proximal superior surface and the distal superior surface reside; and
an inferior member on which the proximal inferior surface and the distal inferior surface reside;
the implant defines a cavity between the superior member and the inferior member;
the superior member is shaped to define a superior living hinge;
the inferior member is shaped to define an inferior living hinge; and
urging the implant to move from the retracted configuration to the deployed configuration comprises:
rotating the distal superior surface superiorly, relative to the proximal superior surface via the superior living hinge; and
rotating the distal inferior surface inferiorly, relative to the proximal inferior surface, via the inferior living hinge.
5 . The method of claim 1 , wherein:
the implant further comprises:
a superior member on which the proximal superior surface and the distal superior surface reside; and
an inferior member on which the proximal inferior surface and the distal inferior surface reside;
the implant defines a cavity between the superior member and the inferior member;
the cavity comprises a proximal end and a distal end;
urging the implant to move from the retracted configuration to the deployed configuration comprises moving a threaded block, in response to rotation of the threaded member, from the proximal end to the distal end;
the cavity is shaped such that, in the retracted configuration, the proximal end is wider than the distal end along a superior-inferior direction transverse to the proximal-distal direction; and
moving the threaded block toward the distal end comprises widening the distal end to urge the distal superior surface and the distal inferior surface to move apart.
6 . The method of claim 1 , wherein:
the implant further comprises:
a superior member on which the proximal superior surface and the distal superior surface reside; and
an inferior member on which the proximal inferior surface and the distal inferior surface reside;
the superior member is formed as a single piece with the inferior member;
the implant further comprises two laterally-facing surfaces, each of which extends between the superior member and the inferior member and defines an aperture;
the apertures cooperate to define an inserter interface; and
the method further comprises:
prior to inserting the implant into the space, coupling the implant to an inserter via the inserter interface; and
after moving the implant from the retracted configuration to a deployed configuration, detaching the implant from the inserter.
7 . The method of claim 1 , wherein:
the distal superior surface and the distal inferior surface each comprises a ridge extending along a lateral direction transverse to the proximal-distal direction; and
moving the implant from the retracted configuration to a deployed configuration comprises causing the ridges to contact the superior spinous process and/or the superior lamina and the inferior spinous process and/or the inferior lamina.