Anterior lumbar cage and inserter device
A plate and cage assembly for stabilization of vertebral bodies. The assembly includes at least one fixation member, a cage having a proximal wall, a superior surface and an inferior surface (the superior surface and the inferior surface for engaging adjacent vertebrae), and a plate coupled to the cage and having at least one hole traversing the plate at an angle for insertion of the at least one fixation member into one of the vertebral bodies. The proximal wall of the cage has a blind hole, and the plate has a threaded screw hole aligned with the blind hole in the proximal wall of the cage.
1 . An assembly for stabilization of adjacent vertebral bodies, comprising:
a cage having a proximal wall, a distal wall, opposing sidewalls, a superior surface and an inferior surface, the superior surface and the inferior surface for respectively engaging the adjacent vertebral bodies; and
a plate coupled to the cage at the proximal wall, the plate having at least one hole traversing the plate at an angle for insertion of at least one bone fastener into one of the adjacent vertebral bodies,
wherein:
the cage has an engagement hole in the proximal wall for engaging with a tip portion of an insertion device,
the plate has an alignment hole extending therethrough and aligned with the engagement hole in the proximal wall,
the cage comprises an engagement flange disposed on a proximal side of the cage adjacent the plate,
the plate comprises an engagement channel configured to be coupled to the engagement flange of the cage,
the engagement channel and the engagement flange are configured to secure the plate to the cage,
the cage comprises a body section extending away from a distal end of the cage, toward the plate, and underneath both the engagement flange of the cage and the engagement channel of the plate; and
the engagement hole in the proximal wall of the cage is disposed at least partially in the body section of the cage.
2 . The assembly of claim 1 , wherein the engagement hole in the proximal wall of the cage comprises a blind hole.
3 . The assembly of claim 1 , wherein the cage and the plate are secured together by sliding the engagement channel of the plate and the engagement flange of the cage together.
4 . The assembly of claim 3 , wherein
the sliding is stopped by the body section comprising a landing at an intermediate position between the superior surface and the inferior surface.
5 . The assembly of claim 1 , wherein respective centers of the engagement hole and the alignment hole lie on a common axis extending away from the proximal wall of the cage.
6 . The assembly of claim 1 , further comprising a retention member on the plate for preventing the at least one bone fastener from backing out from one of the adjacent vertebral bodies.
7 . The assembly of claim 1 , further comprising corrugations on at least one of the superior surface and the inferior surface of the cage.
8 . The assembly of claim 1 , wherein the least one bone fastener comprises a curved bone fastener.
9 . The assembly of claim 8 , wherein the curved bone fastener comprises corrugations disposed on exterior sidewalls of the curved bone fastener member, the exterior sidewalls separated from each other by a channel extending along a length of the curved bone fastener.
10 . The assembly of claim 8 , wherein the curved bone fastener comprises:
a proximal end, and
a distal end having a tapered bone piercing element.
11 . The assembly of claim 10 , wherein
the tapered bone piercing element comprises a first tapered section and a second tapered section,
the first tapered section extends from the corrugations to the second tapered section; and
the second tapered section extends from the first tapered section to a tip of the first tapered section.
12 . The assembly of claim 8 , wherein the curved bone fastener comprises:
a rim at the proximal end for stopping against the at least one hole of the plate when the curved bone fastener is driven into one of the adjacent vertebral bodies.
13 . The assembly of claim 8 , wherein the curved bone fastener has a threaded hole in the proximal end for removal of the curved bone fastener from a vertebra.
14 . A system for stabilization of vertebral bodies,
comprising:
a plate and cage assembly; and
an insertion tool for inserting the plate and cage assembly between two of the vertebral bodies,
wherein the insertion tool comprises:
a carriage for holding at least one bone fastener by at least one clip having two opposing resilient arms and two opposing clasps attached respectively to the two opposing resilient arms, wherein the carriage comprises a chamber housing including separate enclosed curved path sections, the at least one bone fastener is held in the chamber housing of the carriage prior to insertion, and the at least one bone fastener is driven along at least one of the separate enclosed curved path sections inside the chamber housing and inserted into at least one of the two vertebral bodies; and
push rods for pushing the at least one bone fastener through the carriage, through the plate and cage assembly, and into the at least one of the two vertebral bodies.
15 . A system for stabilization of vertebral bodies, comprising:
a plate and cage assembly; and
an insertion tool for inserting the plate and cage assembly between two of the vertebral bodies,
wherein the insertion tool comprises:
a carriage for holding at least one bone fastener by at least one clip having two opposing resilient arms and two opposing clasps attached respectively to the two opposing resilient arms, and
push rods for pushing the at least one bone fastener through the carriage, through the plate and cage assembly, and into the at least one of the two vertebral bodies, and
wherein the push rods comprise three rods arranged to push a) two superior bone fasteners of the at least one bone fastener and b) an inferior bone fastener of the at least one bone fastener into the two vertebral bodies simultaneously.
16 . The system of claim 15 , wherein the insertion tool comprises a slidable block for pushing the two superior bone fasteners and the inferior bone fastener.
17 . The system of claim 15 , wherein at least one of the two superior bone fasteners and the inferior bone fastener comprises a curved fastener held by the at least one clip.
18 . The system of claim 17 , wherein at least one of the three push rods comprises a straight push rod which pushes the curved fastener out of the carriage.
19 . The system of claim 18 , wherein, when pushing the curved fastener out of the carriage occurs, the straight push rod contacts firstly a top edge of a proximal end of the curved fastener and thereafter, as the curved fastener is advanced, the straight push rod progressively contacts lower edges of the proximal end of the curved fastener.
20 . A method for stabilization of vertebral bodies using the system of claim 15 , comprising:
inserting the plate and cage assembly into an intervertebral space between two adjacent vertebral bodies;
holding fastener members including the at least one bone fastener in the carriage of the insertion tool by way of the at least one clip comprising multiple clips holding the fastener members in place prior to insertion in between the two adjacent vertebral bodies; and
securing each of the fastener members into a respective one of the two adjacent vertebral bodies.