US 9,788,971 B1Grant
Expandable fusion implant and related methods
Issue Date:2017-10-17
•5 Claims
•8 Drawing Sheets
Abstract
An expandable spinal fusion implant comprising first and second endplates coupled to an expansion member that sits within a housing. The expansion member is translated by a drive mechanism, whereby translation of the expansion member by the drive mechanism in a distal and proximal directions causes the distance between the endplates to increase and decrease, respectively.
Metadata
Assignee
- NuVasive, Inc.
Inventor
- Christopher Stein
Application Information
Application Number:US 14/285,590
Filing Date:2014-05-22
Priority Date:2013-05-22
Art Unit:3775
Classifications
IPC:
A61F2/44A61F2/30
Field of Search:
A61F 2/44A61F 2/4455A61F 2/446A61F 2/4465A61F 2/447A61F 2002/443
Patent Drawings (8 sheets)
Description
Cross Reference to Related Applications
[0001] This application claims the benefit of the filing date of U.S. Provisional Application No. 61/826,299, which was filed on May 22, 2013. The contents of U.S. Provisional Application No. 61/826,299 are incorporated by reference in their entirety as part of this application.
Background
[0002] This application relates to an expandable spinal fusion implant for use in spinal surgery.
Summary
[0003] To reduce risk of neural injury, the device will have the ability to be implanted to an intervertebral disc space in a collapsed state and expanded to a desired height. Expansion will be accomplished by translating an expansion mechanism mated to the inferior and superior endplates. In addition a large aperture at the proximal end of the device allows for post packing of bone graft material into the hollow interior of the device, which is in communication with a fusion aperture in each of the superior and inferior endplates. In order to have the large through aperture at the proximal end of the device, the drive mechanism is offset from the width centerline of the device.
[0004] The device includes a housing, expansion mechanism, support rails, superior endplate, inferior endplate, endplate retainer, endplate safety retainer, drive mechanism, and drive mechanism retainer.
[0005] The expansion mechanism rides on rails that are retained partially in both the housing and expansion mechanism. There is one rail on each of the two lateral sides of the device. The expansion mechanism has ramps that are on the superior and inferior sides at both the distal and proximal ends. The ramps on the superior side mate with the superior endplate and the ramps on the inferior side mate with the inferior endplate. The expansion member includes a hollow interior for receiving bone graft material and for allowing bone growth therethrough. The hollow interior of the expansion mechanism is in communication with fusion apertures in each of the superior and inferior endplates.
[0006] To achieve expansion and contraction the endplates must be fixed in the longitudinal direction during translation of the expansion mechanism. An endplate retainer housed within the distal end of the housing mates with both the superior and inferior endplates and prohibits translation of the endplates, but allows for expansion.
[0007] The expansion mechanism is translated by advancing the drive mechanism, which is retained within the proximal end of the housing and offset from the width centerline. This offset allows for the large through cannula and post packing of bone graft material. The drive mechanism is mated to the expansion mechanism with the drive mechanism retainer. Advancement of the drive mechanism toward the distal end of the device allows the endplates to expand, while the withdrawal of the drive mechanism toward the proximal end of the device results in contraction of the endplates.
[0008] An endplate safety retainer located in the expansion mechanism prohibits the removal of the superior and inferior endplates from the expansion mechanism. Superior and inferior in flat and lordotic configurations are contemplated for use with the device described herein.
Brief Description of the Drawings
[0009] FIG. 1 is a perspective view of an exemplary embodiment of an expandable spinal fusion implant in its collapsed state;
[0010] FIG. 2 is a perspective view of the expandable spinal fusion implant of FIG. 1 in its expanded state;
[0011] FIG. 3 is a top view of the expandable spinal fusion implant of FIG. 1 ;
[0012] FIG. 4 is a side view of the expandable spinal fusion implant of FIG. 1 in its collapsed state;
[0013] FIG. 5 is a leading end view of the expandable spinal fusion implant of FIG. 1 in its collapsed state;
[0014] FIG. 6 is a trailing end view of the expandable spinal fusion implant of FIG. 1 in its collapsed state;
[0015] FIG. 7 is an exploded view of the expandable spinal fusion implant;
[0016] FIG. 8 is a cross sectional view of the leading end of expandable spinal fusion implant in its expanded state;
[0017] FIG. 9 is a cross sectional view of the trailing end of the expandable spinal fusion implant in its collapsed state;
[0018] FIG. 10 is a cross sectional view of the expandable spinal fusion implant;
[0019] FIG. 11 is a cross sectional view of the expandable spinal fusion implant;
[0020] FIG. 12 is a perspective view of the expandable spinal fusion implant after insertion into the disc space; and
[0021] FIG. 13 is a perspective view of the expandable spinal fusion implant in its fully expanded state in the disc space.
Detailed Description
[0022] FIGS. 1-13 illustrate an expandable spinal fusion implant for use during spinal surgery for implantation to an intervertebral disc space. According to an exemplary embodiment, the device is dimensioned for posterior approach surgery, e.g. posterior lumber interbody fusion (PLIF) and transforaminal lumbar interbody fusion (TLIF) approaches. However, according to an alternative embodiment, the device may also be dimensioned for use in a lateral approach to the anterior column of the spine. To reduce the risk of neural injury, the expandable spinal fusion implant has the ability to be implanted in a collapsed state (see FIG. 1 ) and expand to a height determined by the user (see FIG. 2 ). Expansion is accomplished by translating a wedge shaped expansion mechanism that is mated to the inferior and superior endplates 14, 12. As the expansion mechanism 26 is advanced towards the distal or leading end 16 of the implant 10 the endplates expand in height. To reduce the height of the implant or return the endplates back to their start position the expansion mechanism is advanced towards the proximal end of the device. In addition a large cannula at the trailing or proximal end of the device allows for post packing of hone graft material, i.e. filling the interior of the device with bone graft after the device has been inserted into the intervertebral space and expanded to the desired height. The ability to post pack improves the chances of a successful surgical outcome by allowing for insertion of a sufficient amount of bone graft in adequate contact with the vertebral body endplates adjacent the disc space to promote bone growth.
[0023] As shown in FIGS. 1-13 , the expandable spinal fusion implant 10 has a top endplate 12 and a bottom endplate 14. The endplates 12, 14 have substantially identical features as will be further described. Each endplate has a hone contacting surface 46 and an interior surface 48. As shown in the exemplary embodiment, the bone contacting surfaces 46 may have anti-migration features 44. The interior surfaces 48 of the endplates 12, 14 have ramped portions 36 that correspond to the angles of the ramps 34, 35 on the expansion mechanism 26. The ramped portions 36 of the interior endplates also include a male dovetail feature 40 that mates with the female dovetail feature 38 on the ramps 34 of the expansion mechanism 26. Each endplate 12, 14 has a central fusion aperture 38 to allow for bone growth through the implant 10 and with the endplates of the adjacent vertebral bodies. In order for each endplate 12, 14 to expand it must remain stationary in the longitudinal axis as the expansion mechanism 26 translates both proximally and distally. Both endplates 12, 14 further include a distal extension 70 to aid in retaining the endplates within the housing 20. While the implant 10 according to an exemplary embodiment in FIGS. 1-13 is shown with flat endplates, endplates having built in lordosis, i.e. having a distal height extending from the bone contacting surface to the interior surface that is greater than the proximal height, are also contemplated.
[0024] The expandable spinal fusion implant 10 includes an expansion mechanism 26 located between the top and bottom endplates 12, 14. The expansion mechanism has two wedge portions 50, each of which as a superior ramp 34 and an inferior ramp 35 that correspond to and mate with the ramped portions 36, 37 of the superior and inferior endplates, respectively. Each endplate 12, 14 mates to the expansion mechanism 26 by an undercut or dovetail connection, at both the proximal end and the distal end, that allows movement between the wedge 50 and the endplate 12, 14. Each of the superior ramps 34 and inferior ramps 35 include a female dovetail feature 38 that mates with the male dovetail features 36 on the endplates 12, 14. An endplate safety retainer is housed within the expansion mechanism to prohibit removal of the endplates once assembled. The expansion mechanism 26 has a recess 56 at its proximal end dimensioned to receive the drive mechanism retainer 24 therein. The expansion mechanism 26 has a hollow interior defining a central fusion aperture 39 that aligns with the central fusion aperture 38 of the top and bottom endplates 12, 14 to allow for bone growth therethrough. The distal wedge 50 of the expansion mechanism 26 includes an endplate safety retainer 32 extending therethrough to prevent the dislocation of the endplates 12, 14 from the expansion mechanism 26.
[0025] As best shown in FIG. 7 , the expandable spinal fusion implant 10 also includes a housing 20 dimensioned to house the expansion mechanism 26. The expansion mechanism 26 is supported in the housing 20 by two support rails 60. The housing 20 is defined by opposing lateral walls 21, a distal wall 23 and a proximal wall 25. The housing 20 has a longitudinal length that exceeds the longitudinal length of the endplates 12, 14. The distal wall 23 of the housing is tapered to aid in insertion of the implant 10. The distal wall 23 also includes recesses 58 for receiving the distal extensions 50 of the endplates 12, 14 to retain the endplates with in the housing 20. As seen in FIG. 6 , the proximal wall 25 of the housing 20 includes a cannula 52 for receiving bone graft material into the central fusion aperture 39 of the expansion mechanism 26 as well as a threaded drive mechanism aperture 54 for receiving the drive mechanism 22 therethrough.
[0026] According to the exemplary embodiment, the drive mechanism 22 has a head 62 at its proximal end for engaging an actuator tool (not shown) and a threaded shaft 64 extending from the head 62 and terminating at the distal end with a drive mechanism retainer 24 configured to anchor the drive mechanism 22 to the expansion mechanism 26. The purpose of the drive mechanism 22 is to translate the expansion mechanism 26 both proximally and distally. The threaded shaft 64 of the drive mechanism 22 engages with the threaded aperture 54 of the housing 20 at the proximal end 25 and also mates with the recess 56 at the proximal end of the expansion mechanism 26 and is retained with the expansion mechanism 26 by a drive mechanism retainer 24. As best seen in FIG. 6 , the drive mechanism 22 is located at a position within the implant 10 that is offset from the central longitudinal axis of the implant 10 to allow for post packing of bone graft through the cannula 52 and into the central fusion aperture 39.
[0027] According to the exemplary embodiment, the expandable spinal fusion implant 10 is implanted into a patient by first accessing the desired intervertebral disc space via lateral approach to the anterior spinal column or a posterior (e.g. PLIF or TLIF) approach. The implant 10 is inserted in its collapsed state into the intervertebral disc space and maneuvered into a desired position. Once the desired position is reached, a tool is engaged with the drive mechanism 22 to turn the drive mechanism 22 and thereby urge the expansion mechanism 26 in the distal direction and consequently increase the distance between the top and bottom endplates 12, 14. The drive mechanism 22 can then be turned in the opposite direction to urge the expansion mechanism 26 in the proximal direction in order to decrease the distance between the endplates 12, 14 if necessary. Once the implant 10 has been set at the desired height, bone graft can be introduced through the cannula 52 in the proximal end 25 of the housing 20 to the interior of the implant 10, into the central fusion apertures 38, 39 of the expansion mechanism 26 and endplates 12, 14.
Claims
What is claimed is:
1. An expandable fusion implant, comprising:
a first endplate and a second endplate each having a bone contacting surface and an interior surface with a central fusion aperture extending there between, the interior surface of each of the first endplate and the second endplate including a first ramped surface and a second ramped surface, the first endplate and the second endplate each having a proximal end and a distal end, the proximal end of the first endplate separated from the distal end of the first endplate by a longitudinal length of the first endplate, said proximal end of the second endplate separated from the distal end of the second endplate by a longitudinal length of the second endplate;
an expansion mechanism having a first wedge and a second wedge, each of the first wedge and the second wedge having a first ramp that engages the first ramped surface and the second ramped surface of the first endplate, respectively, and a second ramp that engages the first ramped surface and the second ramped surface of the second endplate respectively;
a housing defined by opposing lateral walls, a distal wall and a proximal wall, the housing having a longitudinal length that is greater than the longitudinal length of each of the first endplate and the second endplate; and
a drive mechanism having a head, a shaft extending from the head and terminating in a distal end, the shaft dimensioned to be received through an aperture in the proximal wall of the housing and the distal end configured to be received within a recess in the expansion mechanism;
wherein the drive mechanism extends along a portion of a single longitudinal axis of the implant and is offset from and parallel to a central longitudinal axis of the implant;
and wherein the housing has a cannula that is in communication with a central aperture in the expansion mechanism and wherein the central aperture in the expansion mechanism is in communication with the central fusion apertures of the first and second endplates.
2. The implant of claim 1, wherein the distal wall is tapered.
3. The implant of claim 1, wherein the drive mechanism is supported by the housing on only one end of the housing.
4. The implant of claim 1, further comprising an endplate safety retainer to prevent dislocation of the first and second endplates.
5. The implant of claim 3, wherein the drive mechanism is supported by the housing in a proximal end of the housing.
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