Bone stabilizing implants and methods of placement across si joints
Inventors
STUART, Mary E. • SCHNEIDER, Bret W. • FOLLINI, Francois • BARTLETT, Craig S. • Desai, Bharat M. • Gardner, Michael J. • MORO, GianLuigi • VAN HELDEN, Sven H. • NISHKIAN, Kyle L. • POLLY, David W. • VANICHKACHORN, Jed S. • KRANENBURG, Andy J. • RAJPAL, Sharad S. • RAINOV, Nikolai G.
Assignees
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Publication Number
US-12201330-B2
Publication Date
2025-01-21
Expiration Date
Abstract
Threaded sacro-iliac joint stabilization (e.g., fusion, fixation) implants and methods of implantation and manufacture. Some implants include a threaded distal region, an optionally threaded central region, and an optionally threaded proximal region. The distal, central, and proximal regions have lengths such that when the implant is laterally implanted across a SI joint, the distal region can be positioned in a sacrum, the central region can be positioned across an SI-joint, and the proximal region can be positioned in an ilium.
Core Innovation
A threaded bone implant is provided with an elongate body extending from a proximal end to a distal end. The elongate body includes an inner shank, one or more threads extending radially from the inner shank along at least a portion of a length of the elongate body, and a porous network of interconnected struts extending radially from the inner shank and disposed axially between the one or more threads. The inner shank, the one or more threads, and the porous network of interconnected struts are formed together with an additive manufacturing process such that they are integral.
The elongate body includes a plurality of fenestrations therethrough in communication with an inner lumen. The plurality of fenestrations interrupt the one or more threads and the porous network of interconnected struts, and a helical flute can be present such that a group of fenestrations is aligned with the helical flute and one or more porous strut free ends are disposed in the helical flute, where the helical flute interrupts the one or more threads.
A central region and a distal region of the elongate body are defined for a distribution of porous-network characteristics. The porous network has greater surface area in the central region than in the distal region, and the central region includes a midpoint of the length of the elongate body. For an implant to be implanted across a sacro-iliac (SI) joint, growth means in the central region adapt the central region to better facilitate ingrowth and/or ongrowth than the distal region.
Claims Coverage
The claim set includes three independent claims. The inventive features focus on an additive-manufactured, integral threaded bone implant having an inner shank, radially extending threads, and a porous network of interconnected struts, with fenestrations, region-specific porous-network surface area, and central-region growth means.
Additive-manufactured integral threaded implant with porous network and fenestrations interrupting threads
An elongate body with an inner shank, one or more threads extending radially from the inner shank along at least a portion of the length, and a porous network of interconnected struts extending radially from the inner shank and disposed axially between the one or more threads, where the inner shank, the one or more threads, and the porous network are formed together with an additive manufacturing process such that they are integral, and where the elongate body has a plurality of fenestrations in communication with an inner lumen that interrupt the one or more threads and the porous network.
Region-differentiated porous-network surface area with central-region midpoint
An elongate body with an inner shank, one or more threads extending radially from the inner shank along at least a portion of the length, and a porous network of interconnected struts extending radially from the inner shank and disposed axially between the one or more threads, where the inner shank, the one or more threads, and the porous network are formed together with an additive manufacturing process such that they are integral, and where the porous network has a greater surface area in a central region than in a distal region, the central region includes a midpoint of the length.
Central-region growth means to facilitate ingrowth/ongrowth across an SI joint
An elongate body with an inner shank, one or more threads extending radially from the inner shank along at least a portion of the length, and a porous network of interconnected struts extending radially from the inner shank and disposed axially between the one or more threads, where the inner shank, the one or more threads, and the porous network are formed together with an additive manufacturing process such that they are integral, and having a growth means in a central region that adapt the central region to better facilitate ingrowth and/or ongrowth than a distal region when the elongate body is implanted across an SI joint.
Across the independent claims, the central inventive theme is an additive-manufactured, integral threaded implant with an inner shank and a porous network of interconnected struts. The claims further differentiate the implant by fenestrations that interrupt threads and porous structure, by greater porous-network surface area in a central region including a midpoint, and by central-region growth means to better facilitate ingrowth and/or ongrowth across an SI joint.
Stated Advantages
Facilitates ingrowth and/or ongrowth by adapting a central region better than a distal region when implanted across an SI joint.
Documented Applications
A threaded bone implant configured to be implanted across a sacro-iliac (SI) joint.
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