	US 12,109,125 B2
	Intervertebral fusion cage implant and surgical procedure therefor
Declan Brazil, Lane Cove West (AU); Andrew Roginsky, Mullingar (IE); and David Edis, Mount Martha (AU)
Assigned to SIGNATURE ORTHOPAEDICS EUROPE LTD, Dublin (IE)
Appl. No. 17/594,857
Filed by SIGNATURE ORTHOPAEDICS EUROPE LTD, Dublin (IE)
PCT Filed Aug. 24, 2021, PCT No. PCT/AU2021/050939 § 371(c)(1), (2) Date Nov. 1, 2021, PCT Pub. No. WO2022/040731, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 2020903045 (AU), filed on Aug. 26, 2020.
Prior Publication US 2022/0304819 A1, Sep. 29, 2022
Int. Cl. A61F 2/44 (2006.01); A61F 2/30 (2006.01)

CPC A61F 2/447 (2013.01) [A61F 2002/30322 (2013.01); A61F 2002/30593 (2013.01); A61F 2002/30785 (2013.01); A61F 2002/30828 (2013.01); A61F 2002/30904 (2013.01)]

20 Claims

1. An intervertebral fusion cage implant, comprising:

the intervertebral fusion case implant being elongate; and

defining superior and inferior bearing surfaces,

the inferior bearing surface having vertebral body engaging interferences; and

the superior bearing surface having:

a smooth surface profile;

sagittal plane convexity, the sagittal plane convexity defining a sagittal plane axis rising anteriorly with respect to a horizontal sagittal plane axis; and

sagittal plane curvature asymmetry, wherein:

the superior bearing surface defines a central section having coronal plane convexity and

lateral sections adjacent the central section and wherein the implant is sized so that the central section bears against a central endplate of an adjacent vertebra in use and the lateral sections bear against opposite sides of an epiphyseal rim of the adjacent vertebra in use.