Implants and techniques for tissue fixation and fusion
Inventors
Assignees
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Publication Number
US-11654028-B2
Publication Date
2023-05-23
Expiration Date
Abstract
A tissue fixation implant that includes leading fixation and trailing fixation members, each fixation member having a proximal head and an elongate shank with a distal tip, and each fixation member adapted to at least partially contact the other fixation member at one or more points along their respective lengths. The tissue fixation implant includes a proximal inter-engagement feature for fixedly engaging each of the two fixation members relative to one another when engaged within tissue, including bone tissue, soft tissue, and combinations of these, and has an interior chamber suitable for receiving osteogenic material to enhance new bone growth and fusion of the fixation implant within bone.
Core Innovation
The invention relates to an orthopedic dual-fixation tissue implant for sacroiliac joint and/or spine fusion, including a leading fixation member and a trailing fixation member. The leading fixation member has a proximal head and an elongate shank with a center axis, where the head comprises a ring with an open aperture that is not concentric with the center axis. The leading elongate shank comprises a center hollow having a hemi-cylindrical shape extending along at least a portion of the shank length, and an expansion ramp feature is proximal to the distal tip.
The trailing fixation member includes a proximal head and an elongate shank having a shape selected from generally cylindrical, generally conical, and generally frustoconical. The implant is assembled by insertion of the trailing fixation member into the open aperture of the proximal head of the leading fixation member and into engagement with bone. The leading and trailing fixation members may be releasably locked into engagement by cooperation thereof.
When the distal tip of the trailing fixation member is contacted with the expansion ramp feature of the leading fixation member while inter-engaged, the contact operates to splay apart the distal tips of the fixation members. The implant further includes an interior chamber sized to receive osteogenic material for enhanced bone growth, and structural embodiments include bony ingrowth openings or slots to promote osseointegration and bone purchase.
Claims Coverage
The partial content provides one independent claim (clm-00001). The main inventive features are centered on a two-member tissue fixation implant with a non-concentric leading aperture, a hemi-cylindrical shank hollow, releasable locking by member cooperation, and an expansion-ramp-driven splaying interaction between distal tips, plus specified trailing member shank geometries.
Non-concentric ring aperture with hemi-cylindrical center hollow and expansion ramp
A leading fixation member having an elongate shank with a center axis and a head, wherein the head comprises a ring with an open aperture that is not concentric with the center axis of the shank, the elongate shank comprises a center hollow having a hemi-cylindrical shape, and an expansion ramp feature is proximal to the distal tip.
Trailing member shank geometry and assembly into leading aperture
A trailing fixation member having a body with a proximal head and an elongate shank whose shape is selected from generally cylindrical, generally conical, and generally frustoconical, wherein the tissue fixation implant is assembled by insertion of the trailing fixation member into the open aperture of a proximal head of the leading fixation member and into engagement with bone.
Releasable locking by cooperation of leading and trailing members
The leading and trailing fixation members may be releasably locked into engagement by cooperation thereof.
Expansion ramp contact that splay apart the distal tips
Contact between the distal tip of the trailing fixation member and the expansion ramp feature of the leading fixation member operates to splay apart the distal tips of the fixation members when they are inter-engaged.
Across the provided independent claim, the implant’s core structural and functional coverage is the combination of a leading ring head with a non-concentric open aperture coupled to a leading hemi-cylindrical center hollow and proximal expansion ramp, a trailing member with shank geometry selected from cylindrical, conical, or frustoconical, member cooperation allowing releasable locking, and expansion ramp contact that splay-apart the distal tips during inter-engagement.
Stated Advantages
Resists rotational motion.
Resists rotational migration.
Resists pullout.
Enhanced osseointegration and bone purchase.
Enhanced bone growth via an interior chamber sized to receive osteogenic material.
Documented Applications
Orthopedic dual-fixation tissue implant for sacroiliac joint and/or spine fusion.
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