Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS20020022842 A1
Publication typeApplication
Application numberUS 09/838,452
Publication dateFeb 21, 2002
Filing dateApr 18, 2001
Priority dateApr 18, 2000
Also published asUS6440137
Publication number09838452, 838452, US 2002/0022842 A1, US 2002/022842 A1, US 20020022842 A1, US 20020022842A1, US 2002022842 A1, US 2002022842A1, US-A1-20020022842, US-A1-2002022842, US2002/0022842A1, US2002/022842A1, US20020022842 A1, US20020022842A1, US2002022842 A1, US2002022842A1
InventorsAndres Horvath, Fredric Williams, Timothy Williams
Original AssigneeHorvath Andres A., Williams Fredric L., Williams Timothy Michael
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Medical fastener cap system
US 20020022842 A1
Abstract
A fastening apparatus provides a fastener body with a female threaded cap receiver having a transverse groove for insertion of a rod. A fastener cap provides a disk shaped cap head and, a male threaded portion within a spaced apart concentric cylindrical rim. The cap head provides a tool engaging fixture to allow the fastener cap to be engaged with the fastener body so as to clamp the rod between the fastener body and the fastener cap. The cylindrical rim engages the cap receiver so as to prevent splaying.
Images(3)
Previous page
Next page
Claims(7)
What is claimed is:
1. A fastening apparatus which comprises: a fastener body providing a female threaded cap receiving means and a transverse groove for receiving a rod, and engaged therewith, a fastener cap providing a disk shaped cap head and, depending therefrom and integral therewith, a male threaded portion within a spaced apart concentric cylindrical rim; the cap head providing a tool engaging means for turning the fastener cap onto the fastener body for clamping the rod; the cylindrical rim engaging the cap receiving means to prevent splaying thereof.
2. The apparatus of claim 1 wherein the fastener body further provides a hook shaped finger depending therefrom.
3. The apparatus of claim 1 wherein the fastener body further provides a male threaded shaft depending therefrom.
4. The apparatus of claim 3 wherein the male threaded shaft and the fastener body are cooperatively engaged for pivotal movement of the threaded shaft within the fastener body.
5. The apparatus of claim 4 further comprising a washer having plural opposing grooves therein, the fastener body providing inwardly protruding upsets engaging the opposing grooves so as to capture the washer within the fastener body.
6. The apparatus of claim 5 wherein the washer provides a spherical annular surface engaging a spherical surface at a proximal end of the threaded shaft whereby the spherical surface of the threaded shaft and the spherical annular surface of the washer are in rotational communion.
7. The apparatus of claim 6 wherein the spherical surface at the proximal end of the threaded shaft terminates at a circular raised peripheral lip.
Description
  • [0001]
    The present invention claims the priority date of a prior filed provisional patent application having serial No. 60/197701 and an official filing date of Apr. 18, 2000 and which discloses substantially the same invention as described herein.
  • BACKGROUND OF THE INVENTION
  • [0002]
    1. Field of the Invention
  • [0003]
    is invention relates generally to hardware fasteners and more particularly to plural fasteners all having a common fastener head and cap system.
  • [0004]
    2. Description of Related Art
  • [0005]
    The following art defines the present state of this field:
  • [0006]
    Harms et al., U.S. Pat. No. 5,207,678 describes a receiver member for a pedicle screw which provides for hingedly connecting a screw comprising a threaded shaft portion and a spherical-segment-shaped head on the one hand and a rod on the other hand. In order to improve the stocking costs for screws of different shaft lengths and shaft diameters, the receiver member has a receiver chamber therein, the receiver chamber has a bore at one end thereof for passing the threaded shaft portion followed by an inner hollow spherical-segment-shaped portion for supporting the head of the screw to be received, and an aperture on the side opposite to the bore for inserting the screw. Further, a compression member is provided which exerts, in assembled state, a force onto the head such that the head is pressed against the hollow spherical-segment-shaped portion. The new receiver member provides that only screws with different screw shafts must be stocked and in operation these screws can be then assembled with the uniform receiver members.
  • [0007]
    Haider U.S. Pat. No. 5,782,833 describes a pedicle screw assembly for use with a rod for the immobilization of bone segments. The assembly is composed of a screw, a polyaxial housing, a washer, a set screw, and a cup-shaped cap. When the screw is placed inside the polyaxial housing, the head of the screw comes into contact with a middle section of the polyaxial housing and is secured into the bone so that the polyaxial housing is pivotable with three degrees of freedom. The housing includes a pair of upstanding posts with interior threads. A washer is inserted between the head of the screw and the rod. A cap, having a bottom, with a pair of posts accommodating openings and a lateral cross connector, is placed over the posts so that the cross connection engages the rod. A set screw is threaded into the housing posts to secure the rod within the housing.
  • [0008]
    Tatar, U.S. Pat. No. 5,910,142 describes a polyaxial pedicle screw device for use with rod implant apparatus, which utilizes a rod mounted ferrule, including a screw having a curvate head and a rod receiving body. The body has a rod receiving channel and an axial bore into which the head of the screw is inserted. The interior surface of the bore is inwardly curvate at the lower end thereof to form a socket for polyaxially retaining the curvate head of the screw. In an initial position the screw head remains polyaxially free with respect to the body. The rod mounted ferrule seats into a small curvate recess in the upper portion of the screw head such that the rod may enter the body at a variety of angles while maintaining a secure seating against the head of the screw. The insertion of a top set screw compresses down on the ferrule, locking the rod in position, and onto the screw head, locking it and the body in position, thus completely securing the assembly.
  • [0009]
    Katz, U.S. Pat. No. 5,989,254 describes a pedicle screw assembly consisting of a screw having a part spherical head providing a saddle shaped contact surface for a connecting rod, the head being held in a coupling member allowing limited angular movement between the screw and coupling member in one plane only and this plane is at right angles to the contact surface. Surfaces are provided in the connecting member for supporting a connecting rod, which is securable in the coupling member by a cap engaging in the coupling member to clamp the connecting rod against the supporting surfaces while still enabling the screw to move angularly with respect to the coupling member.
  • [0010]
    The prior art teaches the use of bone tissue engaged fasteners but does not teach a fastener with a cap having tubular rim for preventing a rod clamping portion of the fastener to be deformed by action of the rod. The present invention fulfills these needs and provides further related advantages as described in the following summary.
  • SUMMARY OF THE INVENTION
  • [0011]
    The present invention teaches certain benefits in construction and use which give rise to the objectives described below.
  • [0012]
    A fastening apparatus provides a fastener body with a female threaded cap receiver having a transverse groove for insertion of a rod. A fastener cap provides a disk shaped cap head and, a male threaded portion within a spaced apart concentric cylindrical rim. The cap head provides a tool engaging fixture to allow the fastener cap to be engaged with the fastener body so as to clamp the rod between the fastener body and the fastener cap. The cylindrical rim engages the cap receiver so as to prevent splaying.
  • [0013]
    A primary objective of the present invention is to provide an apparatus and method of use of such apparatus that provides advantages not taught by the prior art.
  • [0014]
    Another objective is to provide such an invention capable of angular shaft rotation and positioning.
  • [0015]
    A further objective is to provide such an invention capable of capturing a washer within the fastener body.
  • [0016]
    A still further objective is to provide such an invention capable of securing a fastener interconnecting shaft without splaying of the fastener body elements.
  • [0017]
    Other features and advantages of the present invention will become apparent from the following more detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0018]
    The accompanying drawings illustrate the present invention. In such drawings:
  • [0019]
    FIGS. 1-3 are perspective views of preferred embodiments of the invention;
  • [0020]
    [0020]FIG. 4 is an exploded view of the embodiment of FIG. 2 shown in section; and
  • [0021]
    [0021]FIG. 5 is a section view thereof shown as assembled.
  • DETAILED DESCRIPTION OF THE INVENTION
  • [0022]
    The above described drawing figures illustrate the invention in at least one of its preferred embodiments, which is further defined in detail in the following description.
  • [0023]
    The invention is a fastening apparatus designed for threaded insertion into bone tissue and is therefore made of a titanium alloy compatible with human physiology. It has a fastener body 10, shown in FIG. 1, providing a female threaded cap receiving means 20 and a transverse groove 30 for receiving a rod 40. The rod 40 is not a part of the present invention but is used to interconnect plural units of the fastening apparatus. A fastener cap 50 provides a disk shaped cap head 60 and, depending from it, and integral with it, a male threaded portion 70 within a spaced apart concentric cylindrical rim 80. The cap head 60 provides a tool engaging means 90, such as a hex depression commonly used to accept an Allen wrench for turning the fastener cap 50 onto the fastener body 10 for clamping the rod 40 in place. The cylindrical rim 80 engages the cap receiving means 20 to prevent splaying of the cap receiving means 20. This is an important aspect of the present invention and provides superior results as compared to the prior art described above.
  • [0024]
    Preferably, the fastener body 10 further provides a hook shaped finger 100 or a male threaded shaft 110 depending therefrom, as shown in FIGS. 3 and 2 respectively. These features provide a way for the fastener body 10 and cap 50 to be mounted to, or within, bone structures of the body.
  • [0025]
    The male threaded shaft 110 and the fastener body 10 may be cooperatively engaged for pivotal movement of the threaded shaft 110 within the fastener body 10. This is clearly shown in FIG. 5. A washer 120 is used to advantage in this fastener system. The washer 120 has a generally U-shaped conformation with plural opposing grooves 122 formed on an outside wall 124 of the washer 120. The fastener body 10 provides inwardly protruding upsets 12 positioned for engaging the opposing grooves 122 so as to capture the washer 120 within the fastener body 10. The manner in which this is accomplished is as follows. The washer 120 is inserted into the fastener body 10, as is clearly shown in FIG. 2, and aligned with the transverse groove 30. Next, a center punch or similar tool (not shown) is inserted into each one of a pair of opposing blind holes 11 in the fastener body 10 as shown. These holes 11 terminate within 0.002 inches of the interior of the fastener body 10. The center punch is used to deform the material at the bottom of the holes 11 to form the upsets 12, forcing this material to protrude into the interior of the fastener body 10 and thus into the opposing grooves 122.
  • [0026]
    The washer 120 further provides a spherical annular surface 126 adapted by size and shape for engaging a spherical surface 112 at a proximal end 114 of the threaded shaft 110 whereby the spherical surface 112 of the threaded shaft 110 and the spherical annular surface 126 of the washer 120 are able to move in rotational communion with surfaces 112 and 126 in contact. The spherical surface 112 at the proximal end 114 of the threaded shaft 110 terminates at a circular raised peripheral lip 116. This construction enables the rotation of the threaded shaft 110 over a total angular excursion of at least 40 degrees and yet remain in structurally sound interconnection with the washer 120. Preferably, a hex shaped recess 118 is formed in the proximal end 114 of threaded shaft 110 for enabling the shaft 110 to be driven by an Allen wrench.
  • [0027]
    While the invention has been described with reference to at least one preferred embodiment, it is to be clearly understood by those skilled in the art that the invention is not limited thereto. Rather, the scope of the invention is to be interpreted only in conjunction with the appended claims.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7445627Jan 30, 2006Nov 4, 2008Alpinespine, LlcPolyaxial pedicle screw assembly
US7854751Mar 28, 2007Dec 21, 2010Dupuy Spine, Inc.Percutaneous access devices and bone anchor assemblies
US7918857Apr 5, 2011Depuy Spine, Inc.Minimally invasive bone anchor extensions
US7918858Apr 5, 2011Depuy Spine, Inc.Minimally invasive bone anchor extensions
US8197517May 8, 2008Jun 12, 2012Theken Spine, LlcFrictional polyaxial screw assembly
US8414588Apr 9, 2013Depuy Spine, Inc.Methods and devices for minimally invasive spinal connection element delivery
US8518082Nov 12, 2010Aug 27, 2013Depuy Spine, SarlPercutaneous access devices and bone anchor assemblies
US8617210Nov 12, 2010Dec 31, 2013Depuy Spine, SarlPercutaneous access devices and bone anchor assemblies
US8828007Feb 15, 2011Sep 9, 2014DePuy Synthes Products, LLCMinimally invasive bone anchor extensions
US8845649May 13, 2009Sep 30, 2014Roger P. JacksonSpinal fixation tool set and method for rod reduction and fastener insertion
US8852239Feb 17, 2014Oct 7, 2014Roger P JacksonSagittal angle screw with integral shank and receiver
US8870928Apr 29, 2013Oct 28, 2014Roger P. JacksonHelical guide and advancement flange with radially loaded lip
US8894657Nov 28, 2011Nov 25, 2014Roger P. JacksonTool system for dynamic spinal implants
US8911478Nov 21, 2013Dec 16, 2014Roger P. JacksonSplay control closure for open bone anchor
US8926670Mar 15, 2013Jan 6, 2015Roger P. JacksonPolyaxial bone screw assembly
US8926672Nov 21, 2013Jan 6, 2015Roger P. JacksonSplay control closure for open bone anchor
US8936623Mar 15, 2013Jan 20, 2015Roger P. JacksonPolyaxial bone screw assembly
US8998959Oct 19, 2011Apr 7, 2015Roger P JacksonPolyaxial bone anchors with pop-on shank, fully constrained friction fit retainer and lock and release insert
US8998960May 17, 2013Apr 7, 2015Roger P. JacksonPolyaxial bone screw with helically wound capture connection
US9050139Mar 15, 2013Jun 9, 2015Roger P. JacksonOrthopedic implant rod reduction tool set and method
US9050148Nov 10, 2005Jun 9, 2015Roger P. JacksonSpinal fixation tool attachment structure
US9055978Oct 2, 2012Jun 16, 2015Roger P. JacksonOrthopedic implant rod reduction tool set and method
US9084634Jul 11, 2011Jul 21, 2015Theken Spine, LlcUniplanar screw
US9144444May 12, 2011Sep 29, 2015Roger P JacksonPolyaxial bone anchor with helical capture connection, insert and dual locking assembly
US9168069Oct 26, 2012Oct 27, 2015Roger P. JacksonPolyaxial bone anchor with pop-on shank and winged insert with lower skirt for engaging a friction fit retainer
US9211150Sep 23, 2010Dec 15, 2015Roger P. JacksonSpinal fixation tool set and method
US9216039Nov 19, 2010Dec 22, 2015Roger P. JacksonDynamic spinal stabilization assemblies, tool set and method
US9308027Sep 13, 2013Apr 12, 2016Roger P JacksonPolyaxial bone screw with shank articulation pressure insert and method
US9393047Sep 7, 2012Jul 19, 2016Roger P. JacksonPolyaxial bone anchor with pop-on shank and friction fit retainer with low profile edge lock
US20040186473 *Mar 21, 2003Sep 23, 2004Cournoyer John R.Spinal fixation devices of improved strength and rigidity
US20050080414 *Oct 14, 2003Apr 14, 2005Keyer Thomas R.Spinal fixation hooks and method of spinal fixation
US20050131408 *Dec 16, 2003Jun 16, 2005Sicvol Christopher W.Percutaneous access devices and bone anchor assemblies
US20050228380 *Apr 9, 2004Oct 13, 2005Depuy Spine Inc.Instruments and methods for minimally invasive spine surgery
US20060173456 *Jan 30, 2006Aug 3, 2006Hawkes David TPolyaxial pedicle screw assembly
US20070179502 *Mar 19, 2007Aug 2, 2007Aesculap, Inc.Implant device including threaded locking mechanism
US20090143828 *Oct 2, 2008Jun 4, 2009Shawn StadMethods and Devices For Minimally Invasive Spinal Connection Element Delivery
US20090228055 *May 13, 2009Sep 10, 2009Jackson Roger PSpinal fixation tool set and method for rod reduction and fastener insertion
US20100198271 *Aug 5, 2010Vincent LeoneScrew Sheath for Minimally Invasive Spinal Surgery and Method Relating Thereto
US20110060344 *Nov 12, 2010Mar 10, 2011Christopher SicvolPercutaneous Access Devices And Bone Anchor Assemblies
US20140012319 *Sep 13, 2013Jan 9, 2014Roger P. JacksonPolyaxial bone screw with shank articulation pressure insert and method
US20140018864 *Sep 10, 2013Jan 16, 2014Roger P. JacksonPolyaxial bone screw with shank articulation pressure insert and method
Classifications
U.S. Classification606/302
International ClassificationA61B17/70
Cooperative ClassificationA61B17/7037, A61B17/7032
European ClassificationA61B17/70B5B, A61B17/70B2
Legal Events
DateCodeEventDescription
Mar 15, 2006REMIMaintenance fee reminder mailed
Aug 20, 2006SULPSurcharge for late payment
Aug 20, 2006FPAYFee payment
Year of fee payment: 4
Apr 5, 2010REMIMaintenance fee reminder mailed
Aug 27, 2010LAPSLapse for failure to pay maintenance fees
Oct 19, 2010FPExpired due to failure to pay maintenance fee
Effective date: 20100827