# US 10,307,245 B2 · Tendon retention device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,307,245 B2 - Document ID: US10307245B2 - Status: Granted - Kind: B2 - Application number: 15/687,450 - Filed: 2017-08-26 - Published: 2018-03-01 - Granted: 2019-06-04 - Earliest claimed: 2016-08-26 - Assignees: Paragon 28, Inc. - Applicants: Paragon 28, Inc. - Inventors: Douglas K. Blacklidge - Web page: https://patentgrep.com/patent/US10307245B2 ## CPC - A61F 2/0811: {Fixation devices for tendons or ligaments} - A61B 17/683: {comprising bone transfixation elements, e.g. bolt with a distal cooperating element such as a nut} - A61B 17/7291: {for small bones, e.g. in the foot, ankle, hand or wrist} - A61B 2017/564: {Methods for bone or joint treatment} - A61B 2017/681: {Alignment, compression, or distraction mechanisms} - A61F 2002/0823: {Modular anchors comprising a plurality of separate parts} - A61F 2002/0829: {without deformation of anchor parts, e.g. fixation screws on bone surface, extending barbs, cams, butterflies, spring-loaded pins} - A61F 2002/0841: {Longitudinal channel for insertion tool running through the whole tendon anchor, e.g. for accommodating bone drill, guidewire} - A61F 2002/0858: {Fixation of tendon or ligament between anchor and bone, e.g. interference screws, wedges} - A61F 2002/0864: {Fixation of tendon or ligament between anchor elements, e.g. by additional screws in the anchor, anchor crimped around tendon} - A61F 2002/0882: {Anchor in or on top of a bone tunnel, i.e. a hole running through the entire bone} - 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) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A device is provided for retaining a tendon, such as, but not limited to, a flexor digitorum tendon onto an associated bone such as, but not limited to, the plantar aspect of a proximal phalangeal base for correction of a toe contracture. The tendon retention device is defined by a tack and a sleeve. The tack is configured for press-fit or instrument aided reception into the tendon and associated bone to retain the tendon against the associated bone. The sleeve has an internally threaded bore for threaded reception onto a threaded shaft of the tack from the opposing side of the associated bone. The sleeve further has a head with an anti-loosening feature or anti-loosening features such as, but not limited to, tangs and/or cutouts, that engage the associated bone to aid in preventing the sleeve from working loose from the bone and/or unthreading from the tack. ## Claims ### Claim 1 A device for retaining a tendon onto an associated bone, the device comprising: a first component configured for insertion into and through a tendon and into an associated bone, the first component having a base defining a sloped upper side and a lower side, texturing on the sloped upper side of the base, a shank of a first diameter extending from the upper side of the base and having an upper end distal to the base, and an externally threaded shaft extending from the upper end of the shank and having a second diameter that is less than the first diameter of the shank; and a second component configured for insertion into and through the associated bone and onto the first component, the second component having a tubular body defining a first end and a second end, an internally threaded bore extending into the tubular body from the first end thereof and sized to threadedly engage the externally threaded shaft of the first component, and a head on the second end of the tubular body, the head having non-threaded bone engagement features that allow the second component to be threadedly received onto the first component but disallow disengagement of the second component from the first component. ### Claim 2 (depends on 1) The device of claim 1, wherein the non-threaded bone engagement features comprise: a plurality of tangs radially extending from a periphery of the head and defining a plurality of pockets between the tangs. ### Claim 3 (depends on 1) The device of claim 1, wherein the texturing on the sloped upper side of the base comprises a plurality of projections. ### Claim 4 (depends on 1) The device of claim 1, further comprising: a configured bore in an upper surface of the head of the second component. ### Claim 5 (depends on 1) The device of claim 1, further comprising: an angled transition disposed between the upper end of the shank and the externally threaded shaft. ### Claim 6 (depends on 1) The device of claim 1, wherein: the shank and externally threaded shaft of the first component are cylindrical; and the tubular body of the second component is cylindrical. ### Claim 7 (depends on 1) The device of claim 1, wherein an upper end of the externally threaded shaft of the first component is planar. ### Claim 8 (depends on 1) The device of claim 1, further comprising: an internally threaded hole on the lower side of the base. ### Claim 9 A device for securing soft-tissue to a bone comprising: a tack configured for insertion into and through a portion of soft tissue and into a portion of a bone, the tack having a round base defining a sloped upper side and a planar lower side, texturing on the sloped upper side of the rounded base, a shank of a first diameter extending from the upper side of the rounded base and having an upper end distal to the rounded base, and an externally threaded shaft extending from the upper end of the shank and having a second diameter that is less than the first diameter of the shank; and a sleeve configured for insertion into and through the portion of the bone and onto the tack, the sleeve having a tubular body defining a first end and a second end, an internally threaded bore extending into the tubular body from the first end thereof and sized to threadedly engage the externally threaded shaft of the tack, and a head on the second end of the tubular body, the head having non-threaded bone engagement features that allow the second component to be threadedly received onto the tack but disallow disengagement of the second component from the tack. ### Claim 10 (depends on 9) The device of claim 9, wherein the non-threaded bone engagement features comprise: a plurality of tangs radially extending from a periphery of the head and defining a plurality of pockets between the tangs. ### Claim 11 (depends on 9) The device of claim 9, wherein the texturing on the sloped upper side of the round base comprises a plurality of projections. ### Claim 12 (depends on 9) The device of claim 9, further comprising: a configured bore in an upper surface of the head of the sleeve. ### Claim 13 (depends on 9) The device of claim 9, further comprising: an angled transition disposed between the upper end of the shank and the externally threaded shaft. ### Claim 14 (depends on 9) The device of claim 9, wherein: the shank and externally threaded shaft of the tack are cylindrical; and the tubular body of the sleeve is cylindrical. ### Claim 15 (depends on 9) The device of claim 9, wherein an upper end of the externally threaded shaft of the first component is planar. ### Claim 16 (depends on 9) The device of claim 9, further comprising: an internally threaded hole on the lower side of the round base. ### Claim 17 A method for securing a flexor digitorum longus tendon to a plantar aspect of a proximal phalangeal bone for the correction of a toe contracture comprising the steps of: piercing the flexor digitorum longus tendon by a sharp instrument); drilling a bore in the proximal phalangeal bone; providing a retention device comprising: a tack configured for insertion into and through the flexor digitorum tendon and into a plantar aspect of the proximal phalangeal bone, the tack having a round base defining a sloped upper side and a planar lower side, texturing on the sloped upper side of the rounded base, a shank of a first diameter extending from the upper side of the rounded base and having an upper end distal to the rounded base, and an externally threaded shaft extending from the upper end of the shank and having a second diameter that is less than the first diameter of the shank; and a sleeve configured for insertion into and through the proximal phalangeal bone and onto the tack, the sleeve having a tubular body defining a first end and a second end, an internally threaded bore extending into the tubular body from the first end thereof and sized to threadedly engage the externally threaded shaft of the tack, and a head on the second end of the tubular body, the head having non-threaded bone engagement features that allow the second component to be threadedly received onto the tack but disallow disengagement of the second component from the tack; pushing the externally threaded shaft of the tack through the flexor digitorum tendon; tensioning the flexor digitorum tendon; threading the sleeve onto the threaded shaft of the tack until the flexor digitorum tendon is appropriately compressed.