# US 2013/0158608 A1 · Plate and cannulated transfixation screw system for human implant > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0158608 A1 - Document ID: US20130158608A1 - Status: Published application - Kind: A1 - Application number: 13/331,881 - Filed: 2011-12-20 - Published: 2013-06-20 - Earliest claimed: 2011-12-20 - Assignees: OsteoMed LLC - Inventors: RANDY VIOLA; Jennifer Bender; Brandon Beckendorf; Viorel Mocanu - Web page: https://patentgrep.com/patent/US20130158608A1 ## CPC - A61B 17/80: Cortical plates {, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates} - A61B 17/7291: {for small bones, e.g. in the foot, ankle, hand or wrist} - A61B 17/8061: {specially adapted for particular bones (A61B17/70 and A61B17/74 take precedence)} - A61B 17/863: {with thread interrupted or changing its form along shank, other than constant taper} - A61B 17/7225: {for bone compression} - A61B 17/864: {hollow, e.g. with socket or cannulated} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A system for securing first and second bones together across a joint includes a fixation plate comprising a body having a longitudinal axis and first and second ends. A locking screw hole is disposed proximate to the first end. One or more attachment screw holes are disposed in the body. The system includes a screw comprising an elongate hollow body having openings at first and second ends and having a tip at the first end and a head at the second end. ## Claims ### Claim 1 A fixation plate, comprising: a body having a longitudinal axis and first and second ends, the body configured to be placed upon a bone and positioned entirely on one side of a joint, the body having a locking screw hole disposed proximate to the first end, a central axis through the locking screw hole being oriented at an angle between 20 to 50 degrees relative to the longitudinal axis, the body having at least one attachment screw hole. ### Claim 2 (depends on 1) The fixation plate of claim 1, further comprising a locking attachment screw configured to be inserted through the attachment screw hole to lockably engage the attachment screw hole. ### Claim 3 (depends on 1) The fixation plate of claim 1, wherein an inner surface of the locking screw hole comprises an upper countersink and a threaded portion, the threaded portion having double helical threads. ### Claim 4 (depends on 3) The fixation plate of claim 3, wherein the threaded portion is configured to lockably engage a screw. ### Claim 5 (depends on 3) The fixation plate of claim 3, wherein the threaded portion is configured to deform when lockably engaging a screw. ### Claim 6 (depends on 1) The fixation plate of claim 1, wherein the body comprises upper and lower sides, and wherein the a portion of the lower side being contoured to be placed within a sectioned portion of a bone. ### Claim 7 A fixation plate for securing first and second bones together across a joint, comprising: a body having a longitudinal axis and first and second ends, the body configured to be placed upon the first bone and positioned on one side of the joint, a portion of the body proximate to the first end contoured to match the contour of the first bone when placed thereupon, the body having a locking screw hole disposed proximate to the first end, an inner surface of the locking screw hole having an upper countersink, a lower countersink and a threaded portion between the upper and lower countersinks, the threaded portion having double helical threads, a central axis through the locking screw hole being oriented at an angle between 20 to 50 degrees relative to the longitudinal axis, the body having at least one attachment screw hole. ### Claim 8 (depends on 7) The fixation plate of claim 7, wherein the second bone is positioned at an angle between 20 to 50 degrees relative to the longitudinal axis. ### Claim 9 A screw, comprising: an elongate hollow body having openings at first and second ends and having a tip at the first end and a head at the second end; a first thread originating from the tip and extending proximate to the tip, the first thread having a first pitch; a second thread disposed proximate to the head and having a second pitch, the second pitch being different than the first pitch; and a locking thread disposed on the head and having a third pitch. ### Claim 10 (depends on 9) The screw of claim 9, wherein the elongate hollow body includes a smooth shank portion between the first thread and the second thread. ### Claim 11 (depends on 9) The screw of claim 9, wherein the locking thread and the second thread are separated. ### Claim 12 (depends on 9) The screw of claim 9, wherein the locking thread and the second thread are connected. ### Claim 13 (depends on 9) The screw of claim 9, further comprising a recessed region proximate to the tip to form a cutting flute. ### Claim 14 (depends on 9) The screw of claim 9, further comprising a recessed region proximate to the head to form a cutting flute. ### Claim 15 A screw for securing first and second bones together across a joint, comprising: an elongate hollow body having openings at first and second ends and having a tip at the first end and a head at the second end; a first thread originating proximate the tip and extending proximally from the tip, the first thread having a first pitch; a second thread disposed proximate the head, extending distally from the head and having a second pitch, the second pitch being different than the first pitch; and a locking thread disposed on the head and having a third pitch, wherein the screw is configured to extend from the first bone across the joint into the second bone to secure the second bone at an angle between 20 and 50 degrees relative to the first bone. ### Claim 16 (depends on 15) The screw of claim 15, wherein the elongate hollow body includes a smooth shank portion between the first thread and the second thread. ### Claim 17 (depends on 15) The screw of claim 15, wherein the locking thread and the second thread are separated. ### Claim 18 (depends on 15) The screw of claim 15, wherein the locking thread and the second thread are connected. ### Claim 19 (depends on 15) The screw of claim 15, further comprising a recessed region proximate to the tip to form a cutting flute. ### Claim 20 (depends on 15) The screw of claim 15, further comprising a recessed region proximate to the head to form a cutting flute. ### Claim 21 A system for securing first and second bones together across a joint, comprising: a fixation plate having a body, said body having a longitudinal axis and first and second ends, the body configured to be placed upon a bone and reside on one side of a joint, the body having a locking screw hole disposed proximate to the first end, a central axis through the locking screw hole oriented at a first angle between 20 to 50 degrees relative to the longitudinal axis, the body having at least one attachment screw hole; and a screw having an elongate hollow body, said body having openings at first and second ends and having a tip at the first end and a head at the second end, the body configured to extend through the first bone across the joint and into the second bone, the head configured to abut the locking screw hole, said screw further including: a first thread originating proximate the tip and extending proximally to the tip, the first thread having a first pitch; a second thread disposed proximate to the head, extending distally from the head and having a second pitch, the second pitch being different than the first pitch; and a locking thread disposed on the head and having a third pitch, the locking thread configured to engage the locking screw hole. ### Claim 22 (depends on 21) The system of claim 21, wherein the elongate hollow body includes a smooth shank portion between the first thread and the second thread. ### Claim 23 (depends on 21) The system of claim 21, wherein the fixation plate being contoured proximate to the first end to match the contour of a sectioned portion of the first bone. ### Claim 24 (depends on 21) The system of claim 21, wherein said screw includes a recessed region proximate to the tip to form a cutting flute. ### Claim 25 (depends on 21) The system of claim 21, wherein said screw includes a recessed region proximate to the head to form a cutting flute. ### Claim 26 (depends on 21) The system of claim 21, wherein the central axis defines the trajectory of the screw. ### Claim 27 (depends on 21) The system of claim 21, wherein the second bone is positioned at an angle between 20 and 50 degrees relative to the longitudinal axis. ### Claim 28 (depends on 21) The system of claim 21, wherein the attachment screw hole is threaded to lockably engage a locking attachment screw. ### Claim 29 (depends on 21) The system of claim 21, wherein an inner surface of the locking screw hole has an upper counter sink and a threaded portion, the threaded portion having a pair of threads arranged in a double helical configuration. ### Claim 30 (depends on 21) The system of claim 21, wherein the first thread has a larger pitch than the second thread. ### Claim 31 (depends on 21) The system of claim 21, wherein the locking thread and the second thread are separated. ### Claim 32 (depends on 21) The system of claim 21, wherein the locking thread and the second thread are connected. ### Claim 33 (depends on 29) The system of claim 29, wherein the screw hole permits the threadable engagement with the screw at an offset angle from about 0 degrees to about 18 degrees off from the first angle. ### Claim 34 A system for securing first and second bones together across a joint, comprising: a fixation plate configured to be placed upon the first bone and reside on one side of the joint, the fixation plate comprising: a body having a longitudinal axis and first and second ends, the body having a locking screw hole disposed proximate to the first end, an inner surface of the locking screw hole having an upper countersink, a lower countersink and a threaded portion between the upper and lower countersinks, the threaded portion having double helical threads, a central axis through the locking screw hole being oriented at an angle between 20 to 50 degrees relative to the longitudinal axis, the body having at least one attachment screw hole; and a screw comprising: an elongate hollow body having openings at first and second ends and having a tip at the first end and a head at the second end, the body configured to extend through the first bone across the joint and into the second bone, the head configured to abut the locking screw hole; a first thread originating proximate the tip and extending proximally from the tip, the first thread having a first pitch; a second thread disposed proximate to the head and having a second pitch, the second pitch being different than the first pitch; and a locking thread disposed on the head and having a third pitch, the locking thread configured to engage the double helical threads on the locking screw hole when the screw is inserted through the locking screw hole, wherein the second bone is positioned at an angle between 20 and 50 degrees relative to the longitudinal axis. ### Claim 35 (depends on 34) The system of claim 34, wherein the first thread has a larger pitch than the second thread. ### Claim 36 (depends on 34) The system of claim 34, wherein the locking thread and the second thread are separated. ### Claim 37 (depends on 34) The system of claim 34, wherein the locking thread and the second thread are connected. ### Claim 38 (depends on 34) The system of claim 34, wherein the double helical threads are configured to deform when lockably engaging the screw. ### Claim 39 (depends on 34) The system of claim 34, further comprising a recessed region proximate to the tip of the screw to form a cutting flute. ### Claim 40 (depends on 34) The system of claim 34, further comprising a recessed region proximate to the head of the screw to form a cutting flute. ### Claim 41 A fixation plate, comprising: a body connected to a head, the body having an axis and a rear end, the head having a locking screw hole oriented at an angle between 20 to 50 degrees relative to the axis, the body having a plurality of attachment screw holes arranged in at least two rows. ### Claim 42 (depends on 41) The fixation plate of claim 41, wherein a first row of attachment screw holes are arranged on a first side of the axis, and a second row of attachment screw holes are arranged on a second side of the axis. ### Claim 43 (depends on 41) The fixation plate of claim 41, wherein the attachment screw holes are configured to lockably engage respective locking attachment screws. ### Claim 44 (depends on 41) The fixation plate of claim 41, further comprising at least one bridge connecting a pair of the attachment screw holes across the axis. ### Claim 45 (depends on 41) The fixation plate of claim 41, wherein an inner surface of the locking screw hole comprises an upper countersink and a threaded portion, the threaded portion having double helical threads. ### Claim 46 (depends on 41) The fixation plate of claim 41, wherein the threaded portion is configured to lockably engage a screw. ### Claim 47 (depends on 41) The fixation plate of claim 41, wherein the threaded portion is configured to deform when lockably engaging a screw. ### Claim 48 (depends on 41) The fixation plate of claim 41, wherein the plate is configured to be placed on a bone and reside on one side of a joint. ### Claim 49 A fixation plate, comprising: a body connected to a head, the body having an axis and a rear end, the head having a locking screw hole oriented at an angle between 20 to 50 degrees relative to the axis, the body having a plurality of attachment screw holes arranged in two rows; at least one bridge connecting a pair of the attachment screw holes across the axis, wherein the fixation plate is configured to be placed on a bone and reside on one side of a joint. ### Claim 50 (depends on 49) The fixation plate of claim 49, wherein a first row of attachment screw holes are arranged on a first side of the axis, and a second row of attachment screw holes are arranged on a second side of the axis. ### Claim 51 (depends on 49) The fixation plate of claim 49, wherein the attachment screw holes are configured to lockably engage respective locking attachment screws. ### Claim 52 (depends on 49) The fixation plate of claim 49, wherein an inner surface of the locking screw hole comprises an upper countersink and a threaded portion, the threaded portion having double helical threads. ### Claim 53 (depends on 49) The fixation plate of claim 49, wherein the threaded portion is configured to lockably engage a screw.