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EP-4378407-B1 - SPINAL FACET CAGE IMPLANT

EP4378407B1EP 4378407 B1EP4378407 B1EP 4378407B1EP-4378407-B1

Inventors

  • MCCORMACK, BRUCE M.
  • LIOU, EDWARD
  • SCHUMMERS, DAVID MICHAEL
  • SMITH, JEFFREY D.

Dates

Publication Date
20260506
Application Date
20140917

Claims (12)

  1. An implant (100) for implantation in a spinal facet joint, the implant (100) comprising: a distal leading end (102) generally opposite a proximal trailing end (104); a first face (106) generally opposite a second face (108), the first and second faces (106, 108) extending between the distal leading end (102) and the proximal trailing end (104); a first side (110) generally opposite a second side (112); one or more openings (136) defined in the first face (106) generally opposing one or more openings (138) defined in the second face (108); one or more side openings (122) defined in the first side (110) generally opposing one or more openings (126) defined in the second side (112); and textured features (114) positioned on a surface of the first face and/or positioned on a surface of the second face (108), wherein the textured features (114) comprise one or more ridges having a saw toothed profile defined by a plurality of teeth having a leading distal face (148), a trailing proximal face (150), and a tip (146) formed at an intersection between the leading distal face (148) and the trailing proximal face (150) and wherein a height of the tips (146) increase along a length (140), such that teeth positioned near the proximal trailing end (104) have a greater height than teeth positioned near the distal leading end (102).
  2. The implant (100) of claim 1, wherein the trailing proximal face (150) has a slope that is different than a slope of the leading distal face (148).
  3. The implant (100) of claim 2, wherein the textured features (114) include a plurality of grit particles (600) extending generally perpendicularly from a respective surface of the first face (106) and the second face (108).
  4. The implant (100) of claim 3 wherein the plurality of grit particles (600) are randomly adhered to the surfaces of the first face (106) and the second face (108).
  5. The implant (100) of any preceding claim, wherein the openings (136, 138) and the side openings (122, 126) are rectangular in shape.
  6. The implant (100) of any preceding claim, wherein the implant is formed of a bone or bone substitute material or a biocompatible metal, ceramic, polymer, or some combination thereof.
  7. The implant (100) of any preceding claim, wherein a height of the proximal trailing end (104) may be greater than or equal to a height of the distal leading end (102).
  8. The implant (100) of any preceding claim, wherein the first and second faces (106, 108) and include the textured features (114) that provide friction between the spinal facet joint and the implant (100).
  9. The implant (100) of any preceding claim, wherein the implant is a cervical implant.
  10. The implant (100) of any preceding claim, wherein the proximal surface (118) includes at least one hole (210) defined therein.
  11. The implant (100) of any preceding claim, wherein the proximal surface (118) includes at least one internally threaded female receiving feature (5516).
  12. The implant (100) of any preceding claim further comprising slots extending along at least part of each lateral side surface from the proximal trailing end (104) of the implant (100).

Description

FIELD The present disclosure relates to an implant for implantation in a spinal facet joint. BACKGROUND Chronic back problems cause pain and disability for a large segment of the population. Adverse spinal conditions may be characteristic of age. In particular, spinal stenosis (including, but not limited to, central, canal, and lateral stenosis) and facet arthropathy may increase with age. Spinal stenosis results in a reduction of foraminal area (i.e. the available space for the passage of nerves and blood vessels), which may compress cervical nerve roots and cause radicular pain. Both neck extension and ipsilateral rotation, in contrast to neck flexion, may further reduce the foraminal area and contribute to pain, nerve root compression, and neural injury. Cervical disc herniations may be a factor in spinal stenosis and may predominantly present upper extremity radicular symptoms. In this case, treatment may take the form of closed traction. A number of closed traction devices are available that alleviate pain by pulling on the head to increase foraminal height. Cervical disc herniations may also be treated with anterior and posterior surgery. Many of these surgeries are performed through an anterior approach, which requires a spinal fusion. These surgeries may be expensive and beget additional surgeries due to changing the biomechanics of the neck. There is a three percent incidence of re - operation after cervical spine surgery. Moreover, these surgeries may be highly invasive leading to long recovery times. There is a need in the art for implants, delivery systems, and methods of implantation that facilitate the fusion of a spinal facet joint via a minimally invasive or percutaneous procedure from, for example, a posterior approach. It is with these observations in mind, among others, that various aspects of the present disclosure were conceived and developed. US2010/222884 describes an implantable orthopaedic device having a longitudinal axis comprising a first plate, a second plate, and a third plate, wherein the first plate has a first panel and a second panel, and wherein the first panel is extending from a second panel at about a perpendicular angle to the first panel; and wherein the second plate has a first panel and a second panel, and wherein the first panel is extending from a second panel at about a perpendicular angle to the first panel; and wherein the third plate is located between the first panel of the first plate and the first panel of the second plate. BRIEF SUMMARY Implementations described and claimed herein address the foregoing problems, among others, by providing a spinal facet cage implant for implantation in a spinal facet joint. The invention is set out in the appended claims. Other implementations are also described and recited herein. Further, while multiple implementations are disclosed, still other implementations of the presently disclosed technology will become apparent to those skilled in the art from the following detailed description, which shows and describes illustrative implementations of the presently disclosed technology. As will be realized, the presently disclosed technology is capable of modifications in various aspects, all without departing from the scope of the presently disclosed technology as claimed. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not limiting. These and other aspects and embodiments will be described in further detail below, in reference to the attached drawing figures. BRIEF DESCRIPTION OF DRAWINGS FIGS. 1 A-F are front isometric, rear isometric, side, top plan, distal leading end, and proximal trailing end views, respectively, of an example spinal facet cage implant.FIG. 1G is a transverse isometric elevation cross section of the implant of FIGS. 1A-D, as taken along section line G shown in FIG. 1 A.FIG. 1H is a longitudinal isometric elevation cross section of the implant of FIGS. 1A-D, as taken along section line H shown in FIG. 1 A.FIG. II is a transverse isometric plan cross section of the implant of FIGS. 1A-D, as taken along section line I shown in FIG. 1 A.FIG. 1J is a transverse isometric elevation cross section of the implant of FIGS. 1A-D, as taken along section line J shown in FIG. 1 A.FIGS. 2A-F are front isometric, rear isometric, side, top plan, distal leading end, and proximal trailing end views, respectively, of another example spinal facet cage implant.FIGS. 3A-D show front isometric, top plan, proximal trailing end, and side views, respectively, of an example spinal facet cage implant including textured faces having small pyramids.FIGS. 4A-D show isometric, top plan, proximal trailing end, and side views, respectively, of an example spinal facet cage implant including textured faces having large pyramids.FIGS. 5A-D are isometric, top plan, proximal trailing end, and side views, respectively, of an example spinal facet cage implant including textured faces having dimp