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WO2023141428A1 - Système d'élément de fixation à verrouillage - Google Patents

Système d'élément de fixation à verrouillage Download PDF

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Publication number
WO2023141428A1
WO2023141428A1 PCT/US2023/060775 US2023060775W WO2023141428A1 WO 2023141428 A1 WO2023141428 A1 WO 2023141428A1 US 2023060775 W US2023060775 W US 2023060775W WO 2023141428 A1 WO2023141428 A1 WO 2023141428A1
Authority
WO
WIPO (PCT)
Prior art keywords
fastener
threaded
hole
helix
faces
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2023/060775
Other languages
English (en)
Inventor
Stanley E. KIM
Dimitri Protopsaltis
Mike Sherman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Florida
University of Florida Research Foundation Inc
Original Assignee
University of Florida
University of Florida Research Foundation Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Florida, University of Florida Research Foundation Inc filed Critical University of Florida
Publication of WO2023141428A1 publication Critical patent/WO2023141428A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/72—Intramedullary devices, e.g. pins or nails
    • A61B17/7233—Intramedullary devices, e.g. pins or nails with special means of locking the nail to the bone
    • A61B17/725—Intramedullary devices, e.g. pins or nails with special means of locking the nail to the bone with locking pins or screws of special form
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/72—Intramedullary devices, e.g. pins or nails
    • A61B17/7233—Intramedullary devices, e.g. pins or nails with special means of locking the nail to the bone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/846—Nails or pins, i.e. anchors without movable parts, holding by friction only, with or without structured surface
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8625—Shanks, i.e. parts contacting bone tissue
    • A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper

Definitions

  • a method, apparatus, and system for a locking fastener and more particularly, for a locking fastener system whereby a fastener can be inserted into a complementary hole to any depth along a length of the fastener and secured with a turn of less than half of a rotation of the fastener.
  • Locking fasteners are a subset of fasteners that provide an added degree of security when fastened such that they are less likely to loosen. Such locking fasteners are beneficial in environments where substantial movement may occur between fastened objects or where loosening of a fastener can be a safety concern. Locking screws and locking nuts are two examples of fasteners that can add a degree of security upon tightening to better resist loosening than non-locking fasteners.
  • orthopedic devices such as plates, nails, rods, or pins, which are often used in the medical field for fusing bones or bone segments across a joint to correct deformities, treat arthritis, or remedy other issues with procedures such as with a tibiotalocalcaneal arthrodesis.
  • orthopedic devices may also be used to treat fractures of long bones, such as in the humerus, radius, ulna, tibia, fibula, femur, metacarpal, and metatarsal, or other non-long bones, such as ribs, vertebra, the calanceus and other tarsal or carpal bones.
  • Such devices are typically designed to be applied across a joint or fracture site into the bone on either side of the joint or fracture, and generally are fastened to the bones on either side of a joint or to bone segments on either side of the fracture to stabilize the bone and promote proper fusion or healing.
  • Orthopedic devices can benefit from the use of locking fasteners as their use promotes a rigid and secure connection between the orthopedic device and the bone to which they are affixed, and since it is highly undesirable to have a fastener of an orthopedic device loosen and require re-tightening during a healing process or fusion.
  • Example embodiments of the present invention generally related to a locking fastener and more particularly, to a locking fastener system whereby a fastener can be inserted into a complementary hole to any depth along a length of the fastener and then be secured with a turn of less than half of a rotation of the fastener.
  • Embodiments described herein are particularly well- suited for use in orthopedic devices as detailed further below.
  • Embodiments provided herein include a system for a locking fastener including: a body defining a hole, the hole extending along a central axis defined through a center of the hole, where the hole includes a first threaded side with threads of the first threaded side being a portion of a first helix having an axis offset from the central axis of the hole, and a second threaded side where threads of the second threaded side are a portion of a second helix having an offset from the central axis of the hole; a fastener having a fastener shaft where the fastener shaft defines two opposing unthreaded faces and two opposing threaded faces, where the two opposing threaded faces are threaded with a helical pattern that continues from one of the threaded faces to the other of the threaded faces, where the fastener is configured to be inserted into the hole in an insertion orientation without rotation, and where the fastener is configured to become locked within the hole in response to
  • rotation of the fastener from the insertion orientation to the locked orientation is a rotation of between about 30 degrees and 150 degrees.
  • the rotation of the fastener from the insertion orientation to the locked orientation is, in some embodiments, between about 70 degrees and 110 degrees.
  • the first threaded side is opposite the second threaded side within the hole, where the hole defines a first unthreaded portion and a second unthreaded portion, where the first and second unthreaded portion separate the first threaded side from the second threaded side, and where the first unthreaded portion is opposite the second unthreaded portion.
  • the insertion orientation includes the two opposing unthreaded faces of the fastener shaft aligned with the first threaded side and the second threaded side of the hole.
  • the locked orientation of an example embodiment includes the two opposing threaded faces of the fastener aligned with the first threaded side and the second threaded side of the hole.
  • the first helix of the first threaded side has a first thread pitch
  • the second helix of the second threaded side has a second thread pitch equal to the first thread pitch.
  • the first helix and the second helix of an example embodiment are offset relative to one another in a direction along the central axis.
  • the first helix and the second helix are offset relative to one another in a direction along the central axis less than a distance between adjacent threads of the thread pitch.
  • the hole of an example embodiment is defined through an intramedullary nail
  • Other potential embodiments include locking bone plates used for facture fixation, spinal fusion or arthrodesis of other joints.
  • Embodiments provided herein include a method of securing a locking fastener including: receiving into a hole a fastener at an insertion orientation, where the hole includes a first threaded side, where the threads of the first threaded side are a portion of a first helix having an offset from a central axis of the hole, and a second threaded side where the threads of the second threaded side are a portion of a second helix having an offset from the central axis of the hole, where the fastener includes a fastener shaft defining two opposing threaded faces and two opposing unthreaded faces, where the two opposing threaded faces are threaded with a helical thread pattern that continues from one of the threaded faces to the other of the threaded faces, where the insertion orientation includes alignment between the two opposing unthreaded faces with the first unthreaded side and the second unthreaded side; passing the fastener into the hole to a desired location and rotating
  • rotating the fastener from the insertion orientation to the locked orientation includes a rotation of between about 30 degrees and 150 degrees.
  • Rotating the fastener from the insertion orientation to the locked orientation includes a rotation of between about 70 degrees and 110 degrees.
  • Rotating the fastener from the insertion orientation to the locked orientation includes: engaging thread of a first of the two opposing threaded faces with the first threaded side of the hole; and engaging threads of a second of the two opposing threaded faces with the second threaded side of the hole.
  • the first helix of the first threaded side has a thread pitch
  • the second helix of the second threaded side has a second thread pitch equal to the first thread pitch.
  • the first helix and the second helix are, in some embodiments, offset relative to one another in a direction along the central axis.
  • Embodiments provided herein include a locking intramedullary nail including: a body of the intramedullary nail defining a hole, the hole extending along a central axis defined through a center of the hole, where the hole includes a first threaded side, where threads of the first threaded side are a portion of a first helix having an offset from the central axis of the hole; and a second threaded side where threads of the second threaded side are a portion of a second helix having an axis offset from the central axis of the hole; and a fastener having a fastener shaft, where the fastener shaft defines two opposing unthreaded faces and two opposing threaded faces, where the two opposing threaded faces are threaded with a helical thread pattern that continues from one of the threaded faces to the other of the threaded faces, where the fastener is configured to be inserted through a bone into the hole in an insertion orientation without rotation
  • the first helix of the first threaded side has a first thread pitch
  • the second helix of the second threaded side has a second thread pitch equal to the first thread pitch.
  • the first helix and the second helix are offset relative to one another in a direction along the central axis.
  • the rotation of the fastener from the insertion orientation to the locked orientation is a rotation of between about 70 degrees and 110 degrees.
  • Figure 1 illustrates a diagram of an intramedullary nail secured within a bone according to an example embodiment of the present disclosure
  • Figure 2 illustrates a perspective view of a hole for receiving a fastener of the locking fastener system according to an example embodiment of the present disclosure
  • Figure 3 illustrates a diagram of the profile of a hole for receiving a fastener of a locking fastener system according to an example embodiment of the present disclosure
  • Figure 4 illustrates a cross-section view of a hole for receiving a fastener of the locking fastener system according to an example embodiment of the present disclosure
  • Figure 5 illustrates a portion of a fastener of the locking fastener system according to an example embodiment of the present disclosure
  • Figure 6 illustrates engagement between a fastener and a hole of the locking fastener system according to an example embodiment of the present disclosure
  • Figure 7 illustrates a cross section view of a fastener in an insertion orientation within a hole of the locking fastener system according to an example embodiment of the present disclosure
  • Figure 8 illustrates a cross section view of a fastener in a locked orientation within a hole of the locking fastener system according to an example embodiment of the present disclosure
  • Figure 9 is a flowchart of a method for implementing a locking fastener system according to an example embodiment of the present disclosure.
  • Embodiments of the present disclosure generally relate to a locking fastener system.
  • Locking fasteners are used in a wide array of applications where one object is fastened to another.
  • Locking fasteners can be of varying configurations and varying degrees of “locking” whereby “locking” is a term used to describe a resistance to loosening.
  • a locking fastener generally includes a mechanism or structure through which the fastener becomes difficult to loosen such that vibration, repetitive loading cycles and movement between joined objects is less likely to loosen the fastener. While locking fasteners are used in a variety of applications, embodiments of the locking fastener system described herein are particularly useful in securing orthopedic devices to elements of the human body.
  • Embodiments of the locking fastener system described herein can be implemented in an orthopedic device assembly for fusing bones, bone segments, or bone portions in order to fuse joints, repair fractures, repair bone defects, or otherwise add rigidity to a bone or bone portions.
  • the specification and accompanying figures will refer to fracture fixation through stabilization of a broken bone.
  • any type of bone repair, stabilization or fusion of joints, fractures, osteotomies, and other bone defects or fusion sites, and combinations thereof, may be accomplished using embodiments of the system described herein.
  • example embodiments of the present invention are illustrated as joining two or more bone segments to heal across a fracture or otherwise strengthen a single or multiple bones, example embodiments may be used to join two or more different bones together for fusion, or otherwise strengthen a single or multiple bones.
  • the term “bone portion” is used herein to describe any portion of a bone up to and including an entire bone such that fusion of a first bone portion with a second bone portion may describe two separate bones or two portions of a single bone.
  • example embodiments of the present device describe the fracture fixation of two bone portions, example embodiments may further apply compression between more than two bone segments, such as, for example, applying compression across a fracture or between the tibia, talus, and calcaneus bones.
  • Compression applied and maintained by example embodiments of the present disclosure may be applied across any number of bones or bone segments wherein the compression is applied coaxially across the bones or bone segments.
  • Locking intramedullary nails are standard tools used in fracture fixation and bone fusion (also known as joint arthrodesis), particularly for the treatment of long bones (e.g., humerus, ulna, radius, tibia, fibula, and femur). These devices have been used in both human and veterinary patients with great success. Fracture fixation and fusion using intramedullary nails requires fastening of the nail to the bone of the patient such that the intramedullary nail and the bone portions are secured in a fixed relationship.
  • Figure 1 illustrates an example embodiment of an intramedullary nail 110 secured within a tibia 120 of a patient to secure and stabilize a fracture 125 for healing across the fracture.
  • the tibia 120 includes an upper tibia portion 122 and a lower tibia portion 124 separated by the fracture 125.
  • the intramedullary nail 110 is received within the intramedullary cavity of the tibia 120.
  • the upper tibia portion 122 is secured to the intramedullary nail 110 with one or more screws, such as screw 130, while the lower tibia portion 124 is secured to the intramedullary nail with one or more screws such as screw 135.
  • Embodiments described herein provide a fastening mechanism that addresses these issues by ensuring fast and secure locking reliably and repeatably. Embodiments enable a surgeon to drill through the nail with a single pass of a single drill bit, select a fastener of the appropriate length, pass the fastener through the nail, and lock the fastener in place with a simple turn of less than half of a rotation of the fastener.
  • Embodiments provided herein include an intramedullary nail that is of a rigid material such as stainless steel, titanium, or titanium alloy with fasteners of a similar or the same material. Holes are prefabricated in a rod section of the nail.
  • the nail can have one or more different sizes and shapes of cross section; however, a cylindrical cross section or tapered cylindrical cross section is most common.
  • the fastener of example embodiments is received within a prefabricated hole of the nail having a unique female thread pattern and rotated less than a half turn ( ⁇ 180°) to rigidly lock in the hole at any position along the shaft of the fastener.
  • the fastener of embodiments described herein binds into the hole with a cam-like effect. The camlocking is enhanced by the presence of a novel offset double-helix pattern of threads on either of the outside of the fastener or the inside of the prefabricated hole of the nail, as detailed further below.
  • FIG. 1 illustrates an example embodiment of threads cut or otherwise formed into the bore of a hole 140 of an intramedullary nail 110.
  • the hole 140 itself has an oblong profile when viewed through the axis of the hole.
  • a first helix 150 illustrates the helical diameter along which the bottom threads 155 are cut or otherwise formed.
  • a second helix 160 illustrates the helical diameter along which the top threads 165 are cut or otherwise formed.
  • the sidewalls 170 of the hole 140 are unthreaded and may be substantially smooth.
  • the central axis for each of the first helix 150 and the second helix 160 are offset from a central axis of the hole 140.
  • the offset of the first helix 150 and the second helix 160 relative to the central axis of the hole are substantially equal and opposite.
  • Figure 3 illustrates a schematic diagram depicting the hole 140 viewed along the axis along which it extends through the nail.
  • the first helix 150 has a diameter greater than that of a major diameter 175 of the hole 140.
  • the second helix 160 has a diameter greater than that of the major (circumscribed) diameter 175 of the hole 140.
  • the first helix 150 and the second helix 160 have the same or substantially the same diameter in the example embodiment.
  • the hole 140 has a somewhat oblong (or obround) shape with top threads 165, bottom threads 155, and opposing smooth sidewalls 170 defining the perimeter or inner diameter of the hole 140.
  • Figure 4 illustrates a cross-section of a threaded hole of example embodiments taken through a plane through both threaded sides of the hole.
  • the hole includes top threads 165, bottom threads 155, and a smooth sidewall 170.
  • Figure 5 illustrates a portion of the complementary fastener 210 for the hole described above with respect to Figures 2-4, where the illustrated portion of the fastener includes a fastener head 215 and a fastener shaft 220.
  • the fastener shaft 220 includes a first threaded portion 255 and a second threaded portion 265 with a flat face 270 (unthreaded) disposed therebetween.
  • Figure 6 illustrates a diagram of the engagement between the threaded shaft of the fastener and the threads of the hole.
  • Figure 6 illustrates the first helix 150 of the bottom threads 155, the second helix 160 of the top threads 165, and the hole 140.
  • the fastener shaft 220 shown in the insertion orientation at 220A with first the first threaded portion 255 and the second threaded portion 265 adjacent to the smooth sidewalls 170. This insertion orientation allows the fastener shaft 220 to pass through the hole 140 in the nail freely.
  • the fastener shaft 220 can be rotated to the locked orientation at 220B using a screwdriver or screw inserter of appropriate design.
  • This locked orientation can be achieved through a range of rotation angles of the fastener; however, the rotation angle between the insertion orientation 220A and locked orientation 220B is about 90° of rotation. An angle of more than 90° or less than 90° can still achieve a locked orientation; however, maximum thread engagement between the threads of the fastener shaft 220 and the threads of the hole 140 may be reached at 90° according to the illustrated embodiment.
  • the range of locking orientation may be, for example, from 30° to 150° depending upon the specific thread profiles cut into the hole 140 and in the fastener shaft 220.
  • the threads of the hole 140 can therefore engage the threads of the fastener shaft 220 at any point along the threaded length of the fastener shaft.
  • embodiments described herein employ an offset double helix pattern in the threads of at least one of the fastener and/or the hole.
  • the hole having an offset helix pattern between the top threads 165 and the bottom threads 155
  • rotating the fastener from the insertion orientation to the locked orientation binds the threads of the fastener into the threads of the hole with a camlike effect.
  • the offset double helix pattern results in a binding force that serves to lock the fastener within the hole.
  • the term “lock” is used herein to refer to a strong torsional force resisting rotational motion to oppose or “unlock” the fastener from within the hole.
  • lock references an engagement between the threads of the fastener and the threads of the hole in such a way as they cannot be easily loosened without specific and deliberate torque force applied to the fastener head to “unlock” or rotate the fastener from the “locked” orientation (shown as 220B in Figure 6) to the insertion orientation (shown as 220A in Figure 6).
  • Figure 7 illustrates a cross section of the fastener shaft 220 inserted into the hole 140 through the nail 110 the fastener shaft 220 in the insertion orientation.
  • the fastener shaft 220 can be moved fore and aft within the hole 140 of the nail 110 without rotation as in the insertion orientation the fastener shaft glides through the hole.
  • the fastener is rotated, rotating the fastener shaft 220 to the locked orientation shown in Figure 8.
  • the first threaded portion 255 of the fastener shaft 220 engages the bottom threads 155 of the hole while the second threaded portion 265 engages the top threads 165.
  • the helical threads of the top threads 165 and the bottom threads 155 are based on a portion of a respective helix that is offset from a central axis of the hole 140.
  • the thread pitch of the top threads 165 and bottom threads 155 is equal in the illustrated embodiment; however, to achieve the locking/binding forces described herein, the top threads 165 and bottom threads 155 are offset relative to one another in a direction along the central axis of the hole.
  • the offset is less than one thread of the thread pitch, as the offset of exactly one thread would result in equal threading and fail to provide the locking/binding forces described herein.
  • the thread pitch of the top threads 165 and bottom threads 155 are equal in the illustrated embodiment, the threads can be of different pitches. Further, the threads can be multistart or multi-lead thread pitches on both the double helix and the fastener shaft.
  • the double helix can be cut into the inside of the hole 140 as depicted with the two helical patterns shown in Figure 3, where the fastener shaft 220 has a single continuous thread pattern running over its entire length.
  • the circular profile of the fastener shaft cross section is truncated on either side to create two opposing flat surfaces that run the length of the fastener shaft, as shown in Figure 5 and 6.
  • the fastener geometry can be essentially that of a conventional fastener.
  • the hole 140 in the nail 110 has two offset threaded surfaces cut into the opposing side walls making the hole appear substantially obround in profile. This enables the fastener to slide into the hole to the desired position before being rotated approximately 90° to be locked into position.
  • the arrangement of the offset double helix threads can be on the fastener as opposed to the hole in the nail, and the helical threads on opposing sides of the fastener in such an embodiment would be similarly offset by less than a full thread of the thread pitch.
  • the resultant effect is the same, with the threads of the fastener binding in the threads of the hole.
  • the fastener can glide into the hole when the wider axis of the fastener is aligned with the wider axis of the hole.
  • the locking fastener provides a “locking” feature by resisting loosening. Resistance to loosening is particularly important in instances where the materials joined by a fastener experience movement or relative movement. In the case of an orthopedic device, fasteners are subject to thousands of cycles depending upon the specific position within a patient that the fastener is installed. Conventional (non-locking) fasteners will tend to loosen or “back out” when subjected to a high rate of loading cycles. Embodiments of the fastening system described herein resist this loosening.
  • embodiments of the fastener system described herein are able to remain locked, having a relatively high extraction torque level, even after fatigue testing of movement of the fastened objects. Further, the fastened objects remain securely fastened, with no appreciable “slack” between the fastened objects after fatigue testing.
  • Fatigue testing has been performed on embodiments of the fastener system described herein both using axial fatigue testing, where axial loading is controlled from 10 N (Newtons) to 120 N through 50,000 cycles at one cycle per second. The fastener unlocking or removal torque was measured thereafter. The fastener system retained an extraction torque of about 72% of insertion torque.
  • fatigue testing has been performed on embodiments of the fastener system described herein using torsional screw fatigue testing. The torsional testing involved sigmoidal torsional loading and unloading under load control to +/- 0.75 N*m through 50,000 cycles at one cycle per second. The fastening system retained an extraction torque of about 66% of insertion torque.
  • embodiments of the fastening system described herein are particularly well- suited for securing objects that are subject to frequent loading cycles while still retaining the fastening system’s ability to secure objects together with no appreciable slackening.
  • a use case of orthopedic devices particularly benefits from the fastening system described herein, such as for fastening an intramedullary nail.
  • FIG. 9 illustrates a flowchart depicting a method according to example embodiments of the present disclosure. It will be understood that each block of the flowchart and combination of blocks in the flowchart may be implemented in various forms. Accordingly, blocks of the flowchart support combinations of means for performing the specified functions and combinations of operations for performing the specified functions.
  • a fastener is received into a hole at an insertion orientation.
  • the hole of an example embodiment includes a first threaded side with the threads of the first threaded side being a portion of a first helix having an axis offset from a central axis of the hole, and a second threaded side where the threads of the second threaded side are a portion of a second helix having an axis offset from the central axis of the hole.
  • the fastener of an example embodiment includes a fastener shaft defining two opposing unthreaded faces and two opposing threaded faces, where the two opposing threaded faces are threaded with a helical thread pattern that continues from one of the threaded faces to the other of the threaded faces.
  • the insertion orientation includes alignment between the two opposing unthreaded faces with the first threaded side and the second threaded side.
  • the fastener in the insertion orientation, is enabled to pass through the hole without rotation of the fastener as shown at 420.
  • the fastener is rotated from the insertion orientation to a locked orientation, as shown at 430.
  • the locked orientation of an example embodiment includes alignment between the two opposing threaded faces with the first threaded side and the second threaded side.

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Abstract

La présente invention concerne un procédé, un appareil et un système d'élément de fixation à verrouillage, et plus particulièrement un système d'élément de fixation à verrouillage dans lequel un élément de fixation peut être inséré dans un trou complémentaire à n'importe quelle profondeur sur toute la longueur de l'élément de fixation et fixé avec un tour inférieur à la moitié de la rotation de l'élément de fixation. Un système selon l'invention comprend un corps définissant un trou, le trou se prolongeant le long d'un axe central défini à travers un centre du trou ; un élément de fixation comportant une tige d'élément de fixation, la tige d'élément de fixation définissant deux faces non filetées opposées et deux faces filetées opposées, l'élément de fixation étant configuré pour être inséré dans le trou dans une orientation d'insertion sans rotation, et l'élément de fixation étant configuré pour se verrouiller dans le trou en réponse à la rotation de l'élément de fixation de l'orientation d'insertion à une orientation verrouillée.
PCT/US2023/060775 2022-01-19 2023-01-17 Système d'élément de fixation à verrouillage Ceased WO2023141428A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263266922P 2022-01-19 2022-01-19
US63/266,922 2022-01-19

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WO2023141428A1 true WO2023141428A1 (fr) 2023-07-27

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060064096A1 (en) * 2004-09-15 2006-03-23 Stryker Trauma Gmbh Intermedullary locking nail
US20080021477A1 (en) * 2006-03-07 2008-01-24 Strnad Lee A Orthopedic plate having threaded holes for locking screws or pegs and non-threaded holes for a variable axis locking mechanism
US20190336189A1 (en) * 2017-07-28 2019-11-07 Fusion Orthopedics, Llc Orthopedic implant assemblies and devices

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060064096A1 (en) * 2004-09-15 2006-03-23 Stryker Trauma Gmbh Intermedullary locking nail
US20080021477A1 (en) * 2006-03-07 2008-01-24 Strnad Lee A Orthopedic plate having threaded holes for locking screws or pegs and non-threaded holes for a variable axis locking mechanism
US20190336189A1 (en) * 2017-07-28 2019-11-07 Fusion Orthopedics, Llc Orthopedic implant assemblies and devices

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