# US 9,872,712 B2 · Implant system and method for stabilization of a sacro-iliac joint > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,872,712 B2 - Document ID: US9872712B2 - Status: Granted - Kind: B2 - Application number: 14/695,627 - Filed: 2015-04-24 - Published: 2015-08-13 - Granted: 2018-01-23 - Earliest claimed: 2011-01-21 - Assignees: Warsaw Orthopedic, Inc. - Applicants: Warsaw Orthopedic, Inc. - Inventors: Hai H. Trieu - Web page: https://patentgrep.com/patent/US9872712B2 ## CPC - A61B 17/7055: {connected to sacrum, pelvis or skull} - A61B 17/683: {comprising bone transfixation elements, e.g. bolt with a distal cooperating element such as a nut} - A61B 17/863: {with thread interrupted or changing its form along shank, other than constant taper} - A61B 17/864: {hollow, e.g. with socket or cannulated} - A61B 17/8665: {Nuts} - A61B 17/8685: {comprising multiple separate parts} - A61B 17/8695: {Washers (surrounding screw head in plate hole A61B17/8047, between bone plate and bone A61B17/8028)} - A61F 2002/30995: {for sacro-iliac joints} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## Abstract A sacro-iliac implant includes a body extending from a first portion having an outer surface configured for fixation with a sacrum to a second portion having an outer surface being spaced apart and non-continuous with the outer surface of the first portion. A sleeve is disposed about the body and configured for implantation within at least an ilium. The sleeve extends from a first portion to a second portion having an inner surface and a flange disposed to engage an outer non-articular surface of the ilium. The inner surface of the second portion of the sleeve is engageable with the outer surface of the second portion of the body to cause axial translation of the body relative to the sleeve such that naturally separated articular surfaces of the sacrum and ilium are drawn into fixation to immobilize the SI joint. Methods of use are disclosed. ## Claims ### Claim 1 A sacro-iliac implant comprising: a body comprising a proximal end, a distal end and an intermediate portion positioned between the proximal end and the distal end, the proximal end comprising an outer surface defining a first thread form, the intermediate portion comprising an even outer surface and the distal end comprising an outer surface defining a second thread form; a sleeve comprising an inner surface defining an inner cavity configured for disposal of the body, the inner surface comprising a proximal portion that defines a third thread form configured to mate with first thread form to translate the body axially relative to the sleeve, the proximal portion having a diameter that is greater than that of the intermediate portion, the inner surface further comprising a distal portion that is even that supports the outer surface of the intermediate portion for slidable engagement with the outer surface of the intermediate portion; and a locking nut having a threaded inner surface configured to mate with the first thread form to lock the implant in a fixed configuration such that the body is prevented from translating axially relative to the sleeve. ### Claim 2 (depends on 1) A sacro-iliac implant as recited in claim 1, wherein the first thread form has a pitch that is different than that of the second thread form. ### Claim 3 (depends on 1) A sacro-iliac implant as recited in claim 1, wherein the first thread form has a pitch that is less than that of the second thread form. ### Claim 4 (depends on 1) A sacro-iliac implant as recited in claim 1, wherein the distal end comprises a sharpened tip. ### Claim 5 (depends on 1) A sacro-iliac implant as recited in claim 1, wherein the body is hollow. ### Claim 6 (depends on 1) A sacro-iliac implant as recited in claim 1, wherein the body is solid. ### Claim 7 (depends on 1) A sacro-iliac implant as recited in claim 1, wherein the body is porous. ### Claim 8 (depends on 1) A sacro-iliac implant as recited in claim 1, wherein: the body extends along a longitudinal axis between the proximal end and the distal end; and a proximal end of the sleeve comprises a flange that extends perpendicular to the longitudinal axis. ### Claim 9 (depends on 8) A sacro-iliac implant as recited in claim 8, wherein a top surface of the flange that extends perpendicular to the longitudinal axis defines a proximal end surface of the sleeve. ### Claim 10 (depends on 8) A sacro-iliac implant as recited in claim 8, wherein an inner surface of the flange defines a portion of a third thread form. ### Claim 11 (depends on 8) A sacro-iliac implant as recited in claim 8, wherein: the flange has a cross-sectional configuration selected from a group consisting of triangular, square and rectangular; and the sleeve comprises an outer surface having a cross-sectional configuration selected from a group consisting of triangular, square and rectangular. ### Claim 12 (depends on 1) A sacro-iliac implant as recited in claim 1, wherein: a proximal end of the sleeve comprises a flange that extends perpendicular to longitudinal axis defined by the body; and the implant comprises a locking nut having a threaded inner surface configured to mate with the first thread form such that the locking nut engages the flange to lock the implant in a fixation configuration such that the body is prevented from translating axially relative to the sleeve. ### Claim 13 (depends on 1) A sacro-iliac implant as recited in claim 1, wherein the proximal end has a maximum diameter that is greater than that of the intermediate portion. ### Claim 14 (depends on 1) A sacro-iliac implant as recited in claim 1, wherein the distal end has a maximum diameter that is greater than that of the intermediate portion. ### Claim 15 (depends on 1) A sacro-iliac implant as recited in claim 1, wherein the first thread form has a minor diameter that is less than that of the second thread form. ### Claim 16 A sacro-iliac implant comprising: a body extending along a longitudinal axis between a proximal end and an opposite distal end, the body comprising an intermediate portion having an even outer surface positioned between the proximal end and the distal end, the proximal end comprising an outer surface defining a first thread form and the distal end comprising an outer surface defining a second thread form, the proximal end having a maximum diameter that is greater than that of the intermediate portion; a sleeve comprising an inner surface defining an inner cavity configured for disposal of the body, the inner surface comprising a proximal portion that defines a third thread form configured to mate with first thread form to translate the body axially relative to the sleeve, the proximal portion having a diameter that is greater than that of the intermediate portion, the inner surface further comprising a distal portion that is even that supports the outer surface of the intermediate portion for slidable engagement with the outer surface of the intermediate portion, the sleeve comprising a proximal end that includes a flange that extends perpendicular to the longitudinal axis; and a locking nut having a threaded inner surface configured to mate with the first thread form such that the locking nut engages the flange to lock the implant in a fixation configuration such that the body is prevented from translating axially relative to the sleeve. ### Claim 17 (depends on 16) A sacro-iliac implant as recited in claim 16, wherein the body is hollow. ### Claim 18 (depends on 16) A sacro-iliac implant as recited in claim 16, wherein: the first thread form has a pitch that is less than that of the second thread form; the distal end has a maximum diameter that is greater than that of the intermediate portion; and the first thread form has a minor diameter that is less than that of the second thread form. ### Claim 19 A sacro-iliac implant comprising: a hollow body extending along a longitudinal axis between a proximal end and an opposite distal end comprising a sharpened tip, the body comprising an intermediate portion having an even outer surface positioned between the proximal end and the distal end, the proximal end comprising an outer surface defining a first thread form and the distal end comprising an outer surface defining a second thread form, the first thread form having a pitch that is less than that of the second thread form, the first thread form having a minor diameter that is less than that of the second thread form, the distal end having a maximum diameter that is greater than that of the intermediate portion, the proximal end having a maximum diameter that is greater than that of the intermediate portion; a sleeve comprising an inner surface defining an inner cavity configured for disposal of the body, the inner surface comprising a proximal portion that defines a third thread form configured to mate with first thread form to translate the body axially relative to the sleeve, the proximal portion having a diameter that is greater than that of the intermediate portion, the inner surface further comprising a distal portion that is even that supports the outer surface of the intermediate portion for slidable engagement with the outer surface of the intermediate portion, the sleeve comprising a proximal end that includes a flange that extends perpendicular to the longitudinal axis, an inner surface of the flange defining a portion of a third thread form; and a locking nut having a threaded inner surface configured to mate with the first thread form such that the locking nut engages the flange to lock the implant in a fixation configuration such that the body is prevented from translating axially relative to the sleeve.