WO2005030070A1 - Polyaxial bone screw with torqueless fastening - Google Patents
Polyaxial bone screw with torqueless fastening Download PDFInfo
- Publication number
- WO2005030070A1 WO2005030070A1 PCT/US2004/031422 US2004031422W WO2005030070A1 WO 2005030070 A1 WO2005030070 A1 WO 2005030070A1 US 2004031422 W US2004031422 W US 2004031422W WO 2005030070 A1 WO2005030070 A1 WO 2005030070A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- constructed
- bone
- linking
- linear
- linking member
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- 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, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- 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, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7041—Screws or hooks combined with longitudinal elements which do not contact vertebrae with single longitudinal rod offset laterally from single row of screws or hooks
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- 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, setting implements or the like
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/8869—Tensioning devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- 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, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
Definitions
- This invention is directed to spinal implant systems and, in particular, to
- a multi-component adjustable implant system capable of maintaining a desired
- Surgically implanted fixation systems are commonly used to correct a variety of back structure problems, including those which occur as a result of trauma or improper development during growth.
- These fixation systems typically include one or more stabilizing rods aligned in a desired orientation with respect to a patient's spine.
- anchoring screws are inserted into the patient's spinal bones, and a series of connectors is used to rigidly link the rods and anchors.
- known spinal implant systems often correct one set of problems only to create new ones.
- a conventional bone screw consists of a single shaft with a coarse thread at one end for threading into the bone and a machine thread at the other end for coupling to components.
- Another type of bone screw has a U-shaped
- U.S. Patent No. 5,133,717 sets forth a sacral screw with a saddle support. Disclosed is the use of an auxiliary angled screw to provide the
- U.S. Patent No. 5,129,900 sets forth an attachment screw and connector member that is adjustably fastened to an alignment rod. An oblong area provided within each connector member allows minute displacement of the alignment rod.
- U.S. Patent 4,887,595 discloses a screw that has a first externally threaded portion for engagement with the bone and a second externally threaded portion for engagement with a locking nut. The disclosure illustrates the use of a singular fixed shaft.
- U.S. Patent 4,946,458 discloses a screw which employs a spherical portion which is adapted to receive a locking pin so as to allow one portion of the screw to rotate around the spherical portion.
- U.S. Patent 5,002,542 discloses a screw clamp wherein two horizontally disposed sections are adapted to receive the head of a pedicle screw for use in
- U.S. Patent 4,887,596 discloses a pedicle screw for use in coupling an
- U.S. Patent 4,836,196 discloses a screw with an upper portion design for threadingly engaging a semi-spherical cup for use with a specially designed alignment rod.
- the alignment rod having spaced apart covertures for receipt of a spherical disc allowing a support rod to be placed at angular positions.
- U.S. Patent 5,800,435 sets forth a modular spinal plate assembly for use with polyaxial pedicle screw implant devices. The device includes compressible components that cooperatively lock the device along included
- U.S. Patent 5,591,166 discloses an orthopedic bone bolt and bone plate construction including a bone plate member and a collection of fasteners. At least one of the fasteners allows for multi-angle mounting configurations. The fasteners also include threaded portions configured to engage a patient's bone tissue.
- U.S. Patent 5,569,247 discloses a multi-angle fastener usable for connecting patient bone to other surgical implant components. The 247 device includes fastening bolts having spherical, multi-piece heads that allow for
- U.S. Patent 5,716,357 discloses a spinal treatment and long bone
- the apparatus includes link members adapted to engage patient vertebrae.
- the link members may be attached in a chain-like fashion to
- the apparatus also-includes at least
- Another type of spinal fixation system includes rigid screws that engage the posterior region of a patient's spine. The screws are adapted with rod- engaging free ends to engage a support rod that has been formed into a desired spine-curvature-correcting orientation. Clamping members are often used to
- fixation systems such as that disclosed in United States Patent No. 5,129,900, employ connectors that join the support rods and anchoring screws.
- the connectors eliminate unwanted relative motion between the rod and the screws, thereby maintaining the patient's spine in a corrected orientation.
- rigid screw fixation systems can alter the curvature of a patient's spine, they can also be difficult to install.
- the anchoring screws must be secured in a region that is strong/rigid enough to support the characteristically-large loads typically
- installation requires bending a support rod into a path that will not only correct the shape a patient's spine but that will also engage each of the
- adjustable fixation systems are suitable for only a few situations. Additionally, many adjustable fixation systems are prone to post-surgery
- adjustable spinal fixation systems include locking mechanisms designed for long-term, post-surgery securement of the system components.
- U.S. Patent No. 6,050,997 have a bone screw with a spherical cavity in the proximal end.
- a toggle bolt with a spherical distal end is inserted into the cavity in the bone screw.
- a collet is forced into the spherical cavity superior to the spherical end of the toggle bolt.
- a support collar or attachment cap is placed over the toggle bolt and tightened down. This forces the retention collet to engage the spherical portion of the toggle bolt and the inside of the spherical cavity locking the toggle bolt in a selected angular disposition.
- This system requires extremely accurate machining of the threaded components to result in an optimum frictional fit.
- the system should allow component adjustment during installation, thereby enabling satisfactory correction of a wide variety of spinal deformities.
- the system should also include a component locking mechanism that is simple and reliable.
- the system should also include mounting hardware that secures with a
- the system should also include tools and components for the locking mechanism developing a compression fit between components without additional torque on the bone-screw interface.
- the present invention is fastening system for bone screws used in spinal fixation systems for reshaping the spine of a patient.
- the bone screw has threads on one end for anchoring in the spine.
- the other end has a spherical connector with a conical cavity therein.
- the cavity has the larger diameter base of the cone toward the threaded end of the screw and a narrower mouth.
- the mouth of the conical cavity accepts the spherical end of a toggle bolt such that the toggle bolt and the bone screw are connected by a ball joint.
- an associated split retention ring locking mechanism is inserted in the conical cavity between the spherical end of the toggle bolt and the mouth of the cavity.
- the resilient split retention ring can be compressed to reduce it's diameter for insertion through the mouth of the cavity and then expands to fill the conical cavity superior to the spherical end of
- the split retention ring provides infinite adjustment of the locking
- the system is modular,
- the stabilizing rods are shaped and aligned to impart a preferred curvature to a patient's spine.
- the anchoring assemblies are multi-piece units characterized by linking members that are joined in a ball-and-socket-type arrangement with a corresponding bone-engaging member. During use, the bone-engaging member is secured to a spinal bone and the linking member is secured to one of the stabilizing rods via a corresponding connector.
- the bone-engaging member may include coarse, external threads or have a hook-shaped end.
- Each anchoring assembly also includes a support collar that provides a secure interface between the bone-engaging member and associated connector.
- Each anchoring assembly also includes a securing ring and a locking insert that cooperate to prevent unwanted, post-installation motion within the anchoring
- the securing ring and locking insert also prevent unwanted relative motion between the anchoring assembly and associated connector.
- the connectors are rigid structures adapted to link an associated anchoring assembly with one of the stabilizing rods. In one embodiment, the
- connectors are two-piece constructions that allow the connector to engage a stabilizing rod in a sandwich-type arrangement, permitting connector
- the stabilizing rods are rigid members shaped to form a spine- curvature-correcting path. Attaching each anchoring assembly, via connectors,
- Stabilizing rods may be used singly, or in pairs, depending upon the type of correction required.
- the rods vary in size, but typically extend between at least
- the linear fastening system is capable of applying a tensile load to the linking member while supplying a clamping force for securing a connector. More specifically, the system utilizes a cooperating collet member and a compression ring member which are constructed and arranged to slip easily over a linking member while in a first release position.
- the collet member is constructed and arranged with an inner engaging surface and an outer tapered compression surface, the compression ring member being constructed and arranged with an inner tapered compression surface preferably conjugate in shape the outer surface of the collet member.
- the fastener system is secured by sliding the compression member in a linear overlapping fashion over the collet member, thereby utilizing the conical surfaces to compress the collet member
- the linear fastener system is capable of
- connection also allows full thread engagement and a locking connection without the need for plastic inserts
- the dual conical compression surfaces allow very precise tensile loads to be applied to the shank member.
- an objective of the present invention to provide a fastener system for polyaxial bone screws that is capable of securing multiple components into a single assembly without the need to apply rotational torque to the assembly.
- An additional objective of the present invention is to provide a fastener system for polyaxial bone screws capable of linear engagement and disengagement. It is a further objective of the present invention to provide a fastener system for polyaxial bone screws capable of providing linear engagement to
- Figure 1 is a pictorial view of the spinal fixation system of the present invention
- Figure 2 is a perspective view of a toggle-type anchoring assembly used
- FIG. 3 is a perspective view of a saddle-type anchoring assembly used
- FIG. 4 is a perspective view of a toggle-type polyaxial bone-engaging
- Figure 5 is a perspective view of a toggle-type anchoring assembly having the support collar removed;
- Figure 6 is a perspective view of a saddle-type polyaxial bone-engaging screw;
- Figure 7 is a pictorial view of a bone-engaging member from an- anchoring assembly of the present invention;
- Figure 8 is a pictorial view of a linking member from an anchoring assembly of the present invention;
- Figure 9 is a pictorial view of a split retention ring of the present invention;
- Figure 10 is a section view illustrating one method of assembling the present invention;
- Figure 11 is a section view illustrating one method of assembling the
- Figure 12 is a pictorial view illustrating one embodiment of the collet utilized for linear engagement of the present invention
- Figure 13 is a pictorial view illustrating one embodiment of the collet utilized for linear engagement of the present invention
- Figure 14 is a pictorial view illustrating one embodiment of the collet
- Figure 15 is a pictorial view illustrating one embodiment of the
- Figure 16 is a pictorial view illustrating one embodiment of the compression ' ring utilized for linear engagement of the present invention
- Figure 17 is a pictorial view illustrating one embodiment of the compression ring utilized for linear engagement of the present invention.
- the spinal fixation system 10 of the present invention includes a collection of polyaxial bone-engaging anchoring assemblies 12 that are joined via connectors 14,14' to stabilizing rods 16, 16'. The specifics of the spinal fixation system 10 will now be discussed in more detail.
- polyaxial anchoring assemblies 12 illustrated as the toggle bolt type polyaxial bone-screw 11 (FIG 2) and the saddle type polyaxial bone-screw 13
- FIG. 3 Both types of polyaxial bone-screws are illustrated utilizing the linear engaging fastener 100 of the instant invention.
- Figures 4 through 6 show the
- each anchoring assembly 12 also includes a pedicle screw 20.
- each pedicle screw 20 also includes a spherical end 28 spaced apart from the threaded end 26 by a neck portion 30.
- the exterior 32 of the pedicle screw spherical end 28 is preferably contoured for easy grasping.
- the interior of the screw spherical end 28 forms a retention cavity 34, discussed below.
- Each toggle bolt 22, as shown in Figure 8, includes a spherical end 40 and an opposite machined end 42.
- the spherical end 40 may be spherical, conical, or tapered.
- the machined end 42 may be formed with a helical thread, a series of parallel flanges, circular ramps, knurled, or otherwise altered to provide a gripping surface for the linear engaging fastener 100. While the term, machined, is used the bolt may be cast or molded or formed in other ways well known in the art. As shown in Figure 5, the spherical end 40 of the toggle bolt
- the interior of the retention cavity is substantially conical but slightly larger dimensions than the spherical contours of the toggle bolt
- the split retention ring 24 includes a gap 44
- the split retention ring 24 is used as a bracing means to secure the spherical end 40 of the toggle bolt 22 within the pedicle screw retention cavity 34. More specifically, after the toggle bolt spherical end 40 is placed within the pedicle screw retention cavity 34, the split retention ring 24 is pushed through the entrance 36 of the retention cavity 34 by reducing the gap 44 facilitating travel past the engagement lip 38, thereby bringing the split retention ring main body 46 to rest against the engagement lip by spring action resilience of the split retention ring 24. With this arrangement, the split retention ring 24 allows pivotal movement of the toggle bolt 22 within the retention cavity 34, while preventing removal of the toggle bolt therefrom.
- the machined end 42 of the toggle bolt is inserted through a passthrough aperture 48 of the support collar 18. This is shown in Figure 4. Once the toggle bolt 22 has been passed through the support collar passthrough aperture 48, the support collar 18 comes to rest against the pedicle screw ball end 28. Although several shapes are possible, the interior of the support collar 18 preferably has a contour that matches the exterior 32 of the
- toggle bolt ball end 40 to rotate freely within the pedicle screw retention cavity 34.
- the toggle bolt may have
- FIGS. 10 and 11 illustrate the linear tensile force and associated clamping force applied by an engaged linear fastener 100 on the toggle bolt machined end 42 forces relative longitudinal travel through the passthrough aperture 84 and causes the toggle bolt spherical end 40 to be forced against the split retention ring 24 (FIGS 4-9) reducing the gap 44.
- each of the one-piece connectors 14 and two-piece connectors 14' may be attached to an anchoring assembly in a similar manner.
- right-facing offset connectors are attached by inserting a toggle bolt threaded end through the associated passthrough aperture; left-facing offset connectors are joined with an anchoring assembly by inserting a toggle bolt threaded end through an associated passthrough aperture; and left-facing straight connectors are attached to anchoring assemblies by inserting a toggle bolt threaded end through an associated passthrough aperture.
- the exterior connectors 120 of the inserted toggle bolt threaded end 42 are held in place by a compressed collet 116, as described previously.
- the toggle bolt 22' has an extension with a groove 123 beyond the threaded end 42' which serves as a bit to be connected to a linear compression tool 112,
- a collet 116 is placed about the threaded end 42'.
- the collet 116 has a cooperating internal surface 118 matching the configuration of the
- the outer surface of the collet is tapered with a larger base
- the groove 123 is connected to the tool 112 in a manner to apply linear force in a direction away from the screw 20'.
- the linear compression tool has an outer barrel 202 telescopically surrounding the extension 201.
- the tool 112 applies an equal and opposite linear force to the barrel and groove, simultaneously.
- the barrel 202 engages the tapered compression ring 117 to force the compression ring 117 over the collet 116 thereby completing a rigid compression fit.
- the toggle bolt 22 may be constructed having an integrally formed extension with a frangible area (not shown) adjacent the machined end 42' or alternatively a threaded stem may secured to the threaded internal cavity 122. Once the linear engagement is secured, the barrel of the tool 112 can be used to sever the extension or the
- the collet member 116 shown in Figures 12 through 14 is slid or loosely threaded over the external machined end 42 of a linking member 22 or a U-shaped saddle member 150 generally shown in Figures 4 through 6.
- the collet member is provided with at least one slot 128 extending completely through the collet and preferably includes a plurality of
- collet member 116 The external surface 120 of collet member 116 is tapered or
- the internal gripping surface 118 of collet member 116 is generally constructed and arranged to have a conjugate surface to the machined
- surface 118 of the collet member may be constructed and arranged to exert a tensile force on the toggle or saddle members when compressed.
- the collet member 116 may also include a flared base 82 suitable to distribute clamping force over a wide area or provide a load bearing surface for adjacent components.
- the compression ring 117 shown in Figures 15 through 17, has a tapered interior surface 122 which is complementary to the taper of collet member 116.
- the compression ring 117 may be constructed with a flange 124 about the upper surface.
- the flange 124 may have optional lugs 124 formed in a C-shape for engaging an extractor (not shown) used to remove or disconnect the coupling.
- the flange may also have optional wrench
- the spinal fixation system 10 is preferably formed from rigid, biocompatible materials.
- One such preferred material is titanium; however, other materials well known in the art may also be
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2004275818A AU2004275818A1 (en) | 2003-09-26 | 2004-09-24 | Polyaxial bone screw with torqueless fastening |
EP04784999A EP1663034A1 (en) | 2003-09-26 | 2004-09-24 | Polyaxial bone screw with torqueless fastening |
JP2006528232A JP2007506525A (en) | 2003-09-26 | 2004-09-24 | Multiaxial bone screw with torqueless fastening |
CA002540143A CA2540143A1 (en) | 2003-09-26 | 2004-09-24 | Polyaxial bone screw with torqueless fastening |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/673,680 US7335201B2 (en) | 2003-09-26 | 2003-09-26 | Polyaxial bone screw with torqueless fastening |
US10/673,680 | 2003-09-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005030070A1 true WO2005030070A1 (en) | 2005-04-07 |
Family
ID=34376663
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/031422 WO2005030070A1 (en) | 2003-09-26 | 2004-09-24 | Polyaxial bone screw with torqueless fastening |
Country Status (6)
Country | Link |
---|---|
US (1) | US7335201B2 (en) |
EP (1) | EP1663034A1 (en) |
JP (1) | JP2007506525A (en) |
AU (1) | AU2004275818A1 (en) |
CA (1) | CA2540143A1 (en) |
WO (1) | WO2005030070A1 (en) |
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US9681895B2 (en) | 2011-09-30 | 2017-06-20 | Biedermann Technologies Gmbh & Co. Kg | Bone anchoring device and tool cooperating with such a bone anchoring device |
US10492833B2 (en) | 2016-08-24 | 2019-12-03 | Biedermann Technologies Gmbh & Co. Kg | Polyaxial bone anchoring device and system of an instrument and a polyaxial bone anchoring device |
US10751090B2 (en) | 2016-08-04 | 2020-08-25 | Biedermann Technologies Gmbh & Co. Kg | Polyaxial bone anchoring device and system including an instrument and a polyaxial bone anchoring device |
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US11369418B2 (en) | 2017-10-25 | 2022-06-28 | Biedermann Technologies Gmbh & Co. Kg | Polyaxial bone anchoring device |
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- 2004-09-24 WO PCT/US2004/031422 patent/WO2005030070A1/en active Application Filing
- 2004-09-24 CA CA002540143A patent/CA2540143A1/en not_active Abandoned
- 2004-09-24 JP JP2006528232A patent/JP2007506525A/en active Pending
- 2004-09-24 EP EP04784999A patent/EP1663034A1/en not_active Withdrawn
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Cited By (11)
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JP2010515543A (en) * | 2007-01-10 | 2010-05-13 | ファセット ソリューションズ インコーポレイテッド | Taper lock fixing system |
US9681895B2 (en) | 2011-09-30 | 2017-06-20 | Biedermann Technologies Gmbh & Co. Kg | Bone anchoring device and tool cooperating with such a bone anchoring device |
US10136922B2 (en) | 2011-09-30 | 2018-11-27 | Biedermann Technologies Gmbh & Co. Kg | Bone anchoring device and tool cooperating with such a bone anchoring device |
US10751092B2 (en) | 2011-09-30 | 2020-08-25 | Biedermann Technologies Gmbh & Co. Kg | Bone anchoring device and tool cooperating with such a bone anchoring device |
US11484347B2 (en) | 2011-09-30 | 2022-11-01 | Biedermann Technologies Gmbh & Co. Kg | Bone anchoring device and tool cooperating with such a bone anchoring device |
US10751090B2 (en) | 2016-08-04 | 2020-08-25 | Biedermann Technologies Gmbh & Co. Kg | Polyaxial bone anchoring device and system including an instrument and a polyaxial bone anchoring device |
US11730521B2 (en) | 2016-08-04 | 2023-08-22 | Biedermann Technologies Gmbh & Co. Kg | Polyaxial bone anchoring device and system including an instrument and a polyaxial bone anchoring device |
US10492833B2 (en) | 2016-08-24 | 2019-12-03 | Biedermann Technologies Gmbh & Co. Kg | Polyaxial bone anchoring device and system of an instrument and a polyaxial bone anchoring device |
US11344334B2 (en) | 2016-08-24 | 2022-05-31 | Biedermann Technologies Gmbh & Co. Kg | Polyaxial bone anchoring device and system of an instrument and a polyaxial bone anchoring device |
US11369418B2 (en) | 2017-10-25 | 2022-06-28 | Biedermann Technologies Gmbh & Co. Kg | Polyaxial bone anchoring device |
US11090088B2 (en) | 2018-03-06 | 2021-08-17 | Biedermann Technologies Gmbh & Co. Kg | Polyaxial bone anchoring device and system including an instrument and a polyaxial bone anchoring device |
Also Published As
Publication number | Publication date |
---|---|
US20050070899A1 (en) | 2005-03-31 |
CA2540143A1 (en) | 2005-04-07 |
EP1663034A1 (en) | 2006-06-07 |
JP2007506525A (en) | 2007-03-22 |
AU2004275818A1 (en) | 2005-04-07 |
US7335201B2 (en) | 2008-02-26 |
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