ADJUSTABLE SPINAL IMPLANTS, ASSOCIATED INSTRUMENTS AND METHODS
The present disclosure provides adjustable spinal devices, instruments for implanting the spinal devices, methods for adjusting the height and/or lordosis angles of the spinal devices and methods for implanting such devices. An adjustable spinal fusion device includes an upper plate having an outer surface for placement against a first vertebral body and a lower plate having an outer surface for placement against a second vertebral body. The device further includes a first translation member configured to move longitudinally relative to the upper and lower plates to adjust a distance between the upper and lower plates and a second translation member configured to move longitudinally relative to the upper and lower plates to adjust an angle between the upper and lower plates.
1 . An adjustable spinal fusion device, comprising:
an upper endplate having an outer surface for placement against a first vertebral body;
a lower endplate having an outer surface for placement against a second vertebral body;
a first translation member configured to move longitudinally relative to the upper and lower endplates to adjust a distance between the upper and lower endplates; and
a second translation member configured to move longitudinally relative to the upper and lower plates to adjust an angle between the upper and lower endplates.
2 . The adjustable spinal fusion device of claim 1 , wherein longitudinal movement of the first translation member causes longitudinal movement of the second translation member to adjust the distance and angle between the upper and lower endplates.
3 . The adjustable spinal fusion device of claim 1 , wherein longitudinal movement of the second translation member relative to the first translation member adjusts the angle between the upper and lower endplates.
4 . The adjustable spinal fusion device of claim 1 , further comprising a first rotatable shaft coupled to the first translation member for moving the first translation member in the longitudinal direction and a second rotatable shaft coupled to the second translation member for moving the second translation member in the longitudinal direction.
5 . The adjustable spinal fusion device of claim 4 , wherein the first translation member includes a first movable wedge having at least one angled surface and wherein the upper and lower endplates each comprise a ramp for cooperating with the angled surface of the first movable wedge such that longitudinal movement of the first movable wedge adjusts a distance between at least a proximal portion of the upper and lower endplates.
6 . The adjustable spinal fusion device of claim 5 , wherein the upper and lower endplates each comprise first and second ramps extending towards each other in the proximal direction, wherein the first movable wedge comprises first and second upper angled surfaces for cooperating with the first and second ramps of the upper endplate and first and second upper angled surfaces for cooperating with the first and second ramps of the lower endplate.
7 . The adjustable spinal fusion device of claim 1 , wherein the first translation member comprises at least one projection extending laterally away from the first translation member and at least one of the upper and lower endplates comprises an angled slot for receiving the projection to stabilize the upper and lower endplates during longitudinal movement of the first translation member.
8 . The adjustable spinal fusion device of claim 5 , wherein the second translation member includes a second movable wedge with at least one angled surface and wherein the upper and lower endplates each comprise a ramp for cooperating with the angled surface of the second movable wedge of the second translation member such that longitudinal movement of the second movable wedge adjusts a distance between at least a distal portion of the upper and lower endplates.
9 . The adjustable spinal fusion device of claim 8 , wherein the upper and lower endplates each comprise first and second ramps extending towards each other in the proximal direction, wherein the second movable wedge comprises first and second upper angled surfaces for cooperating with the first and second ramps of the upper endplate and first and second upper angled surfaces for cooperating with the first and second ramps of the lower endplate.
10 . The adjustable spinal fusion device of claim 1 , wherein the second translation member comprises at least one guide arm that cooperates with at least one guide rail on the upper endplate to stabilize the upper and lower endplates during longitudinal movement of the second translation member.
11 . The adjustable spinal fusion device of claim 4 , further comprising a stabilization plate coupled to the first rotatable shaft such that the stabilization plate remains fixed in place relative to the upper and lower endplates as the first and second translation members are moved in the longitudinal direction.
12 . The adjustable spinal fusion device of claim 11 , wherein the stabilization plate includes a projection defining a central channel and the first translation member comprises at least one vertical projection extending into the central channel, wherein the central channel stabilizes lateral movement of the first translation member.
13 . The adjustable spinal fusion device of claim 11 , wherein the stabilization plate includes one or more knobs extending laterally from the stabilization plate and at least one of the upper and lower endplates comprises an internal slot for receiving the at least one or more knobs to stabilize the upper and lower endplates as the first translation member is moved longitudinally.
14 . A spinal fusion system, comprising:
an adjustable spinal fusion device comprising:
an upper plate component having an outer surface for placement against an endplate of a vertebral body;
a lower plate component having an outer surface for placement against an endplate of a vertebral body; and
a movable wedge configured to move longitudinally relative to the upper and lower plates to adjust a distance and an angle between the upper and lower plates; and
an instrument having a proximal handle, an elongate shaft and an actuator within the elongate shaft coupled to the proximal handle and the movable wedge for translating the movable wedge longitudinally relative to the upper and lower endplates.
15 . The system of claim 14 , wherein the movable wedge comprises a first movable wedge, the system further comprising a second movable wedge, wherein the actuator comprises a first rotatable shaft coupled to the proximal handle the first movable wedge and a second rotatable shaft coupled to the proximal handle the second movable wedge.
16 . The system of claim 14 , further comprising a stabilization plate coupled to the first rotatable shaft such that the stabilization plate remains fixed in place relative to the upper and lower endplates as the first and second movable wedges are moved in the longitudinal direction, wherein the instrument further comprising first and second gripping arms configured for coupling to the stabilization plate.
17 . An adjustable spinal fusion device, comprising:
an upper endplate having an outer surface for placement against a first vertebral body;
a lower endplate having an outer surface for placement against a second vertebral body, wherein the lower endplate is a separate component from the upper endplate;
a translation member configured to move longitudinally relative to the upper and lower endplates to adjust a distance between at least a portion the upper and lower endplates; and
wherein the translation member comprises one or more projections extending laterally from the translation member and wherein at least one of the endplates comprises one or more slots for receiving the projections to couple the upper endplate to the lower endplate.
18 . The spinal fusion device of claim 17 , wherein the translation member is a first translation member for adjusting the distance between the upper and lower endplates, the device further comprising a second translation member configured to move longitudinally relative to the upper and e lower plates to adjust an angle between the upper and lower endplates.
19 . The spinal fusion device of claim 18 , wherein the second translation member comprises one or more projections extending laterally from the second translation member and wherein at least one of the endplates comprises one or more slots for receiving the projections to couple the upper endplate to the lower endplate
20 . The spinal fusion device of claim 17 , further comprising a stabilization plate that is a separate component as the upper and lower endplates and the translation member, wherein the stabilization plate comprises one or more projections and at least one of the upper and lower endplates comprises one or more slots for receiving the one or more projections and coupling the stabilization member to the upper and lower endplates.
21 . The spinal fusion device of claim 20 , wherein the stabilization plate includes a projection defining a central channel and the first translation member comprises at least one vertical projection extending into the central channel to couple the first translation member to the stabilization plate.
22 . The spinal fusion device of claim 17 , wherein at least one of the upper and lower endplates comprises a surface with one or more exhaust openings for extracting metal powder from within the device.