US20140058525A1 - Acetabular Cup Fixation - Google Patents
Acetabular Cup Fixation Download PDFInfo
- Publication number
- US20140058525A1 US20140058525A1 US14/053,244 US201314053244A US2014058525A1 US 20140058525 A1 US20140058525 A1 US 20140058525A1 US 201314053244 A US201314053244 A US 201314053244A US 2014058525 A1 US2014058525 A1 US 2014058525A1
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- head
- locking system
- fixation
- fastener
- opening
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- Abandoned
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- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
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- A61B17/8033—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
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- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
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Definitions
- Acetabular cups are used with various fixation fasteners that can secure the cups to the bone in orthopedic procedures.
- the present teachings provide various methods and devices for securing acetabular cups to bone with locking fixation fasteners.
- the present teachings provide various acetabular cup systems and methods of locking fixation fasteners to acetabular cups and preventing loosening and back out of the fixation fasteners during use.
- the acetabular cup system in another aspect, includes an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening including a first wall portion adjacent to the inner surface and a second wall portion adjacent to the outer surface, the first wall portion being internally threaded and the second wall portion being unthreaded and tapered.
- the acetabular cup system also includes a fixation fastener including a head and a shaft with a bone anchoring portion, the fastener insertable though the fixation opening, the head including a first head portion threadably engageable with the first wall portion and a second head portion tapered for taper lock connection with the second wall portion.
- the acetabular cup system includes an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening having an unthreaded surface, and a fixation fastener including a head and a shaft with a bone anchoring portion, the fastener insertable though the fixation opening, the head including a threaded portion with self-tapping threads threadably engageable with the fixation opening.
- the acetabular cup system includes an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening having a threaded portion, and a fixation fastener including an inner head attached to a bone-anchoring shaft and an outer head pivotably coupled to the inner head, the outer head including a threaded portion threadably engageable with the fixation opening, the inner head including a driver engagement recess.
- FIG. 1 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings
- FIG. 2 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings
- FIG. 3 is a sectional elevation view of an acetabular cup, a fixation fastener and a locking cap according to the present teachings;
- FIG. 5 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings
- FIG. 6 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings
- FIG. 7 is a sectional elevation view of an acetabular cup, a fixation fastener and an insert according to the present teachings
- FIG. 7A is a perspective view of the insert of FIG. 7 ;
- FIG. 8 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings
- FIG. 9 is a sectional elevation view of an acetabular cup, a fixation fastener and a locking cap according to the present teachings.
- FIG. 10 is a sectional elevation view of an acetabular cup, and a two-piece fixation fastener according to the present teachings
- FIG. 12 is a perspective view of a variable angle locking fixation fastener according to the present teachings.
- FIG. 12A is an exploded and partially sectional view of the fixation fastener of FIG. 12 ;
- FIG. 12B is a perspective view of the outer head of the fixation fastener of FIG. 12 ;
- FIG. 12C is a plan view of the outer head of FIG. 12B ;
- FIG. 12D is a side view detail of the fixation fastener of FIG. 12 , showing the inner head of the fixation fastener.
- acetabular cups can be used, including, but not limited to, porous metal acetabular cups, such as porous titanium cups, and the RegenerexTM cup, commercially available from Biomet, Inc., of Warsaw, Ind.
- porous metal acetabular cups such as porous titanium cups
- RegenerexTM cup commercially available from Biomet, Inc., of Warsaw, Ind.
- an exemplary acetabular cup 100 can include a wall 109 having a concave inner surface 101 and a convex outer surface 107 .
- the wall 109 can include one or more fixation holes or other through openings 102 for receiving corresponding fixation fasteners 200 .
- An exemplary fixation fastener 200 can generally include a head 202 and a shaft or shank 204 with a threaded portion 208 for anchoring into the acetabular bone.
- the head 202 of the fastener 200 can include a male threaded portion 206 and a male tapered portion 210 .
- the tapered portion 210 of the head 202 can taper toward the shank 204 of the fastener 200 .
- the fixation opening 102 of the cup 100 can similarly have a female threaded portion 104 and a female tapered portion 106 .
- the tapered portion 210 of the head 202 of the fastener 200 and the tapered portion 106 in the opening 102 of the acetabular cup 100 can have appropriate taper angles to form a taper lock connection.
- the tapered portion 210 of the head 202 of the fastener 200 can mate and taper lock with the tapered portion 106 of the opening 102 , locking the fastener 200 to the cup 100 .
- the tapered portion of the head 202 is adjacent to the shank 204
- the tapered portion 106 of the cup 100 is adjacent the outer convex surface of the cup 100
- the positions of the tapered and threaded portions are reversed.
- the threaded portion 206 of the head 202 is adjacent the shank 204 and the threaded portion 104 of the opening 102 is adjacent the outer convex surface of the cup 100 .
- the threaded portion 206 of the head 202 and the threaded portion 104 of the opening 102 can be tapered, as shown in FIG. 2 , or straight, similarly to FIG. 1 .
- the head 202 of the fastener 200 can include a curved or rounded or spherical undersurface 220 and a rounded upper surface 222 that can be textured.
- the opening 102 in the acetabular cup 100 can have a similarly curved or rounded or spherical lower portion 120 configured to receive the undersurface 220 of the head 202 of fastener 200 adjustably, such that the fastener 200 can angulate or pivot in the direction of the curved arrows B relative to an axis A passing through the center of the opening 102 .
- the opening 102 of the acetabular cup 100 can include a threaded portion 104 above the spherical portion 120 .
- the threaded portion 104 of the opening 102 can engage the external threads 252 of a threaded washer or other locking cap or locking member 250 .
- the threaded washer 250 can include a textured undersurface 254 that can engage the textured upper surface 222 of the head 202 of the fastener 200 .
- the fastener 200 can be positioned within the opening 102 of the acetabular cup 100 , adjustably angled relative to the axis A of the opening 102 and threaded into the bone.
- the threaded washer 250 can be inserted into the opening 102 and rotated such that the undersurface 254 of the threaded washer 250 engages the upper surface 222 of the head 202 of the fastener 200 , thereby locking the fastener 200 in the acetabular cup 100 and the bone and preventing back out of the fastener 200 during use.
- the head 202 of the fastener 200 can include a curved or spherical portion 203 and a threaded portion 206 , which can be cylindrical.
- the threads of the threaded portion 206 can be self tapping.
- the opening 102 in the acetabular cup 100 can include a corresponding spherical portion 103 that can engage the spherical portion 203 of the head 202 of the fastener 200 .
- the opening 102 in the acetabular cup 100 can also include a cylindrical portion 105 .
- the self-tapping threaded portion 206 on the head 202 of the fastener 200 can tap threads into the wall of the cylindrical portion 105 of the opening 102 , until the head 202 of the fastener 200 is fully seated in the opening 102 and secured to the cup 100 .
- the acetabular cup 100 can be made of porous metal, such as porous titanium, RegenerexTM, or other biocompatible material that can be relatively easily tapped.
- the head 202 of the fastener 200 can include a tapered threaded portion 206 with self-tapping threads which can cut into the similarly tapered opening 102 of the acetabular cup 100 .
- the acetabular cup 100 can be made of porous metal for tapping by the self-tapping threaded portion 206 of the head 202 of the fastener 200 , as discussed above in connection with FIG. 4 .
- the acetabular cup 100 can be made of porous metal that can be peened or otherwise plastically deformed.
- the head 202 of the fastener 200 is inserted through the opening 102 and positioned on a pocket or seat 130 defined by the opening 102 .
- An area 132 of the acetabular cup 100 immediately surrounding the upper portion of the opening 102 adjacent to the head 202 of the fastener 200 can be peened or otherwise deformed with a tool such that the deformed area 132 can overlap a portion of the head 202 and trap the head 202 in the seat 130 preventing the fastener 200 from backing out of the opening 102 during use.
- the opening 102 of the cup 100 can be spherically shaped and rotatably receive a spherically shaped insert 300 .
- the insert 300 can include a through bore 302 having internal threads 304 .
- the insert 300 can include meridian slits 306 that allow expansion of the insert 300 .
- the head 202 of the fastener 200 can include a tapered portion 210 , which can be fully or partially threaded with threads 206 .
- the fastener 200 can be inserted through the bore 302 , and the head 202 of the fastener 200 can be threadably engaged with the threads 304 of the insert 300 , forcing the insert 300 to expand.
- the expansion of the insert 300 lockingly engages the insert 300 to the opening 102 of the acetabular cup 100 and prevents rotational movement between the insert 300 and the acetabular cup 100 .
- the insert 300 can move in a limited manner with respect to the acetabular cup 100 so as to permit optimal positioning of the fastener 200 with respect to the cup 100 before securing the fastener 200 to the cup 100 .
- the opening 102 in the acetabular cup 100 can include a fully threaded portion 104 engaging a corresponding threaded portion 206 of the head 202 of the fastener 200 .
- the opening 102 and the head 202 can be straight or tapered and can be fully threaded or have respective unthreaded portions 106 and 210 .
- the fixation fastener 200 can include a spherical head 202 with a hex or otherwise shaped recess 228 in its upper surface to allow the fastener 200 to be rotated by an appropriate driver.
- the opening 102 of the acetabular cup 100 can include an upper internally threaded portion 104 and a lower spherical portion defining a seat 120 .
- the fastener 200 can be inserted into the opening 102 of the acetabular cup 100 such that the head 202 of the fastener 200 is received in the seat 120 of the acetabular cup 100 .
- a locking nut 250 having external threads 252 and a recess 256 for a driver can be threadably engaged with the threaded portion 104 of the opening 102 , thereby locking the head 202 of the fastener 200 to the acetabular cup 100 .
- the fastener 200 can include a head 202 in the form of a spherical cavity.
- a locking washer 250 can be pivotably coupled to the head 202 of the fastener 202 with a pivot pin 260 forming a two-piece fixation construct.
- the pivot pin 260 allows the shank 204 of the fastener 200 to angulate relative to the washer 250 such that the shank 204 can be inserted at various angles relative to the axis A of the opening 102 , while maintaining the ability to prevent back out by threadably engaging the locking washer 250 to the internal threaded portion 104 of the opening 102 of the acetabular cup 100 .
- the fixation fastener 200 can include at least a spherical head portion or, alternatively, a spherical head 202 having an external threaded portion 206 .
- the threaded head 202 of the fastener can be received in a threaded spherical socket 104 defined in the opening 102 of the acetabular cup 100 .
- the threaded head 202 of the fastener can be rotated and inserted at an angle not aligned with the axis of the opening 102 , such that the threads of the head 202 of the fastener 200 and the threads of the opening 102 of the acetabular cup 100 can cross-thread and lock.
- the fastener 200 can include an inner head 202 fixedly connected to a shank 204 with a neck portion 211 , and an outer head 400 pivotably coupled with the inner head 202 .
- the inner head 202 can include a driver engaging recess 232 .
- the shank 204 can include a threaded portion 208 and an anchoring distal tip 209 .
- the inner head 202 can be pivotably received in an opening 406 of the outer head 400 .
- the outer head 400 can include outer threads 402 for threadably locking the fixation fastener 200 into a threaded opening of an acetabular cup or other implant.
- the outer head 400 can include a driver engagement feature 404 and an end lip 408 that can be swaged or otherwise deformed to capture the inner head 202 .
- the threaded outer head 400 can lock the fixation fastener 200 into a similarly threaded hole of an acetabular cup 100 , or a fixation plate or other implant, preventing back out of the fixation fastener 200 , while allowing angulation of the shank 204 for anchoring the fixation fastener 200 at a selected orientation.
- first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
- Spatially relative terms such as “inner,” “outer,” “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
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- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
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- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
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Abstract
An acetabular cup system includes an acetabular cup having a wall with an inner surface and an outer surface. The acetabular cup includes a fixation opening through the wall, the fixation opening including a first wall portion adjacent to the inner surface and a second wall portion adjacent to the outer surface. The acetabular cup system also includes a fixation fastener including a head and a shaft with a bone-anchoring portion. The fastener can be inserted though the fixation opening. The head includes a first head portion engageable with the first wall portion and a second head portion engageable with the second wall portion.
Description
- This application is a division of U.S. patent application Ser. No. 13/299,663, filed on Nov. 18, 2011, which is a division of U.S. patent application Ser. No. 12/370,951, filed on Feb. 13, 2009, which claims the benefit of U.S. Provisional Application No. 61/030,027, filed on Feb. 20, 2008. The entire disclosures of the above applications are incorporated herein by reference.
- Acetabular cups are used with various fixation fasteners that can secure the cups to the bone in orthopedic procedures.
- The present teachings provide various methods and devices for securing acetabular cups to bone with locking fixation fasteners.
- The present teachings provide various acetabular cup systems and methods of locking fixation fasteners to acetabular cups and preventing loosening and back out of the fixation fasteners during use.
- The present teachings provide an acetabular cup system that includes an acetabular cup having a wall with an inner surface and an outer surface. The acetabular cup includes a fixation opening through the wall, the fixation opening including a first wall portion adjacent to the inner surface and a second wall portion adjacent to the outer surface. The acetabular cup system also includes a fixation fastener including a head and a shaft with a bone-anchoring portion. The fastener can be inserted though the fixation opening. The head includes a first head portion engageable with the first wall portion and a second head portion engageable with the second wall portion.
- In another aspect, the acetabular cup system includes an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening including a first wall portion adjacent to the inner surface and a second wall portion adjacent to the outer surface, the first wall portion being internally threaded and the second wall portion being unthreaded and tapered. The acetabular cup system also includes a fixation fastener including a head and a shaft with a bone anchoring portion, the fastener insertable though the fixation opening, the head including a first head portion threadably engageable with the first wall portion and a second head portion tapered for taper lock connection with the second wall portion.
- In another aspect, the acetabular cup system includes an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening having an unthreaded surface, and a fixation fastener including a head and a shaft with a bone anchoring portion, the fastener insertable though the fixation opening, the head including a threaded portion with self-tapping threads threadably engageable with the fixation opening.
- In a further aspect, the acetabular cup system includes an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening having a threaded portion, and a fixation fastener including an inner head attached to a bone-anchoring shaft and an outer head pivotably coupled to the inner head, the outer head including a threaded portion threadably engageable with the fixation opening, the inner head including a driver engagement recess.
- Further areas of applicability of the present teachings will become apparent from the description provided hereinafter. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present teachings.
- The present teachings will become more fully understood from the detailed description and the accompanying drawings, wherein:
-
FIG. 1 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings; -
FIG. 2 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings; -
FIG. 3 is a sectional elevation view of an acetabular cup, a fixation fastener and a locking cap according to the present teachings; -
FIG. 4 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings; -
FIG. 5 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings; -
FIG. 6 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings; -
FIG. 7 is a sectional elevation view of an acetabular cup, a fixation fastener and an insert according to the present teachings; -
FIG. 7A is a perspective view of the insert ofFIG. 7 ; -
FIG. 8 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings; -
FIG. 9 is a sectional elevation view of an acetabular cup, a fixation fastener and a locking cap according to the present teachings; -
FIG. 10 is a sectional elevation view of an acetabular cup, and a two-piece fixation fastener according to the present teachings; -
FIG. 11 is a sectional elevation view of an acetabular cup and a fixation fastener according to the present teachings; -
FIG. 12 is a perspective view of a variable angle locking fixation fastener according to the present teachings; -
FIG. 12A is an exploded and partially sectional view of the fixation fastener ofFIG. 12 ; -
FIG. 12B is a perspective view of the outer head of the fixation fastener ofFIG. 12 ; -
FIG. 12C is a plan view of the outer head ofFIG. 12B ; and -
FIG. 12D is a side view detail of the fixation fastener ofFIG. 12 , showing the inner head of the fixation fastener. - The following description is merely exemplary in nature and is in no way intended to limit the present teachings, applications, or uses. For example, although the present teachings illustrate various fasteners for use with acetabular cups, the present teachings can be used for fixation of fasteners to other prosthetic components.
- The present teachings provide various aspects related to the fixation of acetabular cups to bone through the use of fixation fasteners and preventing loosening or back out of the fasteners during use. Any type of acetabular cups can be used, including, but not limited to, porous metal acetabular cups, such as porous titanium cups, and the Regenerex™ cup, commercially available from Biomet, Inc., of Warsaw, Ind. Methods for fabricating acetabular cups and other implant components from porous metal material are described in co-pending and commonly assigned patent application Ser. No. 11/357,929, filed Feb. 17, 2006, the disclosure of which is incorporated by reference herein.
- Referring to
FIGS. 1-10 , an exemplaryacetabular cup 100 can include awall 109 having a concaveinner surface 101 and a convexouter surface 107. Thewall 109 can include one or more fixation holes or other throughopenings 102 for receivingcorresponding fixation fasteners 200. Anexemplary fixation fastener 200 can generally include ahead 202 and a shaft orshank 204 with a threadedportion 208 for anchoring into the acetabular bone. - Referring to
FIGS. 1 and 2 , thehead 202 of thefastener 200 can include a male threadedportion 206 and a male taperedportion 210. Thetapered portion 210 of thehead 202 can taper toward theshank 204 of thefastener 200. The fixation opening 102 of thecup 100 can similarly have a female threadedportion 104 and a femaletapered portion 106. Thetapered portion 210 of thehead 202 of thefastener 200 and thetapered portion 106 in the opening 102 of theacetabular cup 100 can have appropriate taper angles to form a taper lock connection. Accordingly, as the threadedportion 206 of thehead 202 engages the threadedportion 104 of the opening 102 of thecup 100, thetapered portion 210 of thehead 202 of thefastener 200 can mate and taper lock with thetapered portion 106 of theopening 102, locking thefastener 200 to thecup 100. - In the exemplary illustration of
FIG. 1 , the tapered portion of thehead 202 is adjacent to theshank 204, and thetapered portion 106 of thecup 100 is adjacent the outer convex surface of thecup 100. In the exemplary illustration ofFIG. 2 , the positions of the tapered and threaded portions are reversed. Specifically, the threadedportion 206 of thehead 202 is adjacent theshank 204 and the threadedportion 104 of theopening 102 is adjacent the outer convex surface of thecup 100. Referring toFIG. 2 , the threadedportion 206 of thehead 202 and the threadedportion 104 of theopening 102 can be tapered, as shown inFIG. 2 , or straight, similarly toFIG. 1 . - Referring to
FIG. 3 , thehead 202 of thefastener 200 can include a curved or rounded orspherical undersurface 220 and a roundedupper surface 222 that can be textured. In addition, theopening 102 in theacetabular cup 100 can have a similarly curved or rounded or sphericallower portion 120 configured to receive theundersurface 220 of thehead 202 offastener 200 adjustably, such that thefastener 200 can angulate or pivot in the direction of the curved arrows B relative to an axis A passing through the center of theopening 102. Theopening 102 of theacetabular cup 100 can include a threadedportion 104 above thespherical portion 120. The threadedportion 104 of theopening 102 can engage theexternal threads 252 of a threaded washer or other locking cap or lockingmember 250. The threadedwasher 250 can include atextured undersurface 254 that can engage the texturedupper surface 222 of thehead 202 of thefastener 200. In operation, thefastener 200 can be positioned within theopening 102 of theacetabular cup 100, adjustably angled relative to the axis A of theopening 102 and threaded into the bone. Once thefastener 200 is anchored into the bone, the threadedwasher 250 can be inserted into theopening 102 and rotated such that theundersurface 254 of the threadedwasher 250 engages theupper surface 222 of thehead 202 of thefastener 200, thereby locking thefastener 200 in theacetabular cup 100 and the bone and preventing back out of thefastener 200 during use. - Referring to
FIG. 4 , thehead 202 of thefastener 200 can include a curved orspherical portion 203 and a threadedportion 206, which can be cylindrical. The threads of the threadedportion 206 can be self tapping. Theopening 102 in theacetabular cup 100 can include a correspondingspherical portion 103 that can engage thespherical portion 203 of thehead 202 of thefastener 200. Theopening 102 in theacetabular cup 100 can also include acylindrical portion 105. During insertion, the self-tapping threadedportion 206 on thehead 202 of thefastener 200 can tap threads into the wall of thecylindrical portion 105 of theopening 102, until thehead 202 of thefastener 200 is fully seated in theopening 102 and secured to thecup 100. In this respect, theacetabular cup 100 can be made of porous metal, such as porous titanium, Regenerex™, or other biocompatible material that can be relatively easily tapped. - Referring to
FIG. 5 , thehead 202 of thefastener 200 can include a tapered threadedportion 206 with self-tapping threads which can cut into the similarly taperedopening 102 of theacetabular cup 100. Theacetabular cup 100 can be made of porous metal for tapping by the self-tapping threadedportion 206 of thehead 202 of thefastener 200, as discussed above in connection withFIG. 4 . - Referring to
FIG. 6 , theacetabular cup 100 can be made of porous metal that can be peened or otherwise plastically deformed. Thehead 202 of thefastener 200 is inserted through theopening 102 and positioned on a pocket orseat 130 defined by theopening 102. Anarea 132 of theacetabular cup 100 immediately surrounding the upper portion of theopening 102 adjacent to thehead 202 of thefastener 200 can be peened or otherwise deformed with a tool such that thedeformed area 132 can overlap a portion of thehead 202 and trap thehead 202 in theseat 130 preventing thefastener 200 from backing out of theopening 102 during use. - Referring to
FIGS. 7 and 7A , theopening 102 of thecup 100 can be spherically shaped and rotatably receive a spherically shapedinsert 300. Theinsert 300 can include a throughbore 302 havinginternal threads 304. Theinsert 300 can include meridian slits 306 that allow expansion of theinsert 300. Thehead 202 of thefastener 200 can include a taperedportion 210, which can be fully or partially threaded withthreads 206. Thefastener 200 can be inserted through thebore 302, and thehead 202 of thefastener 200 can be threadably engaged with thethreads 304 of theinsert 300, forcing theinsert 300 to expand. The expansion of theinsert 300 lockingly engages theinsert 300 to theopening 102 of theacetabular cup 100 and prevents rotational movement between theinsert 300 and theacetabular cup 100. Before thefastener 200 is inserted, theinsert 300 can move in a limited manner with respect to theacetabular cup 100 so as to permit optimal positioning of thefastener 200 with respect to thecup 100 before securing thefastener 200 to thecup 100. - Referring to
FIG. 8 , theopening 102 in theacetabular cup 100 can include a fully threadedportion 104 engaging a corresponding threadedportion 206 of thehead 202 of thefastener 200. Theopening 102 and thehead 202 can be straight or tapered and can be fully threaded or have respective unthreadedportions - Referring to
FIG. 9 , thefixation fastener 200 can include aspherical head 202 with a hex or otherwise shapedrecess 228 in its upper surface to allow thefastener 200 to be rotated by an appropriate driver. Theopening 102 of theacetabular cup 100 can include an upper internally threadedportion 104 and a lower spherical portion defining aseat 120. Thefastener 200 can be inserted into theopening 102 of theacetabular cup 100 such that thehead 202 of thefastener 200 is received in theseat 120 of theacetabular cup 100. A lockingnut 250 havingexternal threads 252 and arecess 256 for a driver can be threadably engaged with the threadedportion 104 of theopening 102, thereby locking thehead 202 of thefastener 200 to theacetabular cup 100. - Referring to
FIG. 10 , theopening 102 of theacetabular cup 100 is similar to theopening 102 shown inFIG. 9 . Thefastener 200 can include ahead 202 in the form of a spherical cavity. A lockingwasher 250 can be pivotably coupled to thehead 202 of thefastener 202 with apivot pin 260 forming a two-piece fixation construct. Thepivot pin 260 allows theshank 204 of thefastener 200 to angulate relative to thewasher 250 such that theshank 204 can be inserted at various angles relative to the axis A of theopening 102, while maintaining the ability to prevent back out by threadably engaging the lockingwasher 250 to the internal threadedportion 104 of theopening 102 of theacetabular cup 100. - Referring to
FIG. 11 , thefixation fastener 200 can include at least a spherical head portion or, alternatively, aspherical head 202 having an external threadedportion 206. The threadedhead 202 of the fastener can be received in a threadedspherical socket 104 defined in theopening 102 of theacetabular cup 100. Further, the threadedhead 202 of the fastener can be rotated and inserted at an angle not aligned with the axis of theopening 102, such that the threads of thehead 202 of thefastener 200 and the threads of theopening 102 of theacetabular cup 100 can cross-thread and lock. - Referring to
FIGS. 12-12D , various aspects of a variableangle locking fastener 200 are illustrated. Thefastener 200 can include aninner head 202 fixedly connected to ashank 204 with aneck portion 211, and anouter head 400 pivotably coupled with theinner head 202. Theinner head 202 can include adriver engaging recess 232. Theshank 204 can include a threadedportion 208 and an anchoringdistal tip 209. Theinner head 202 can be pivotably received in anopening 406 of theouter head 400. Theouter head 400 can includeouter threads 402 for threadably locking thefixation fastener 200 into a threaded opening of an acetabular cup or other implant. Theouter head 400 can include adriver engagement feature 404 and anend lip 408 that can be swaged or otherwise deformed to capture theinner head 202. The threadedouter head 400 can lock thefixation fastener 200 into a similarly threaded hole of anacetabular cup 100, or a fixation plate or other implant, preventing back out of thefixation fastener 200, while allowing angulation of theshank 204 for anchoring thefixation fastener 200 at a selected orientation. - The foregoing discussion discloses and describes merely exemplary arrangements of the present teachings. Furthermore, the mixing and matching of features, elements and/or functions between various embodiments is expressly contemplated herein, so that one of ordinary skill in the art would appreciate from this disclosure that features, elements and/or functions of one embodiment may be incorporated into another embodiment as appropriate, unless described otherwise above. Moreover, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. One skilled in the art will readily recognize from such discussion, and from the accompanying drawings that various changes, modifications and variations can be made therein without departing from the spirit and scope of the present teachings.
- The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a”, “an” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.
- Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
- Spatially relative terms, such as “inner,” “outer,” “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Claims (23)
1. A locking system, comprising:
an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening having a threaded portion; and
a fixation fastener including an inner head attached to a shaft with a bone-anchoring portion and an outer head coupled to the inner head, the outer head including a threaded portion threadably engageable with the fixation opening, the inner head including a driver engagement recess.
2. The locking system of claim 1 , wherein the fixation opening further includes an internally threaded portion and a curved portion defining a seat.
3. The locking system of claim 2 , wherein the outer head is threadably engageable with the internally threaded portion and the inner head is receivable within the seat.
4. The locking system of claim 1 , further comprising a locking washer pivotably coupled to the inner head.
5. The locking system of claim 4 , further comprising a pivot pin coupling the locking washer with the inner head.
6. The locking system of claim 1 , wherein the outer head is pivotably coupled to the inner head.
7. The locking system of claim 1 , wherein the inner head is a spherical cavity.
8. The locking system of claim 1 , wherein the shaft with the bone-anchoring portion is configured to angulate relative to the outer head such that an axis of the shaft can be selectable to various angles relative to an axis of the opening.
9. The locking system of claim 1 , further comprising a locking washer threadably engaged with the threaded portion of the fixation opening and pivotably coupled to the inner head.
10. The locking system of claim 1 , wherein the acetabular cup comprises porous metal.
11. A locking system comprising:
a prosthetic member having a wall with an inner surface and an outer surface, the prosthetic member including a fixation opening, the fixation opening have a threaded surface and an unthreaded surface; and
a fixation fastener including a first head and a second head, the first head attached to a bone-anchoring shaft and the second head pivotably coupled to the first head.
12. The locking system of claim 11 , wherein the first head includes a spherical portion and the second head includes a threaded portion.
13. The locking system of claim 12 , wherein the unthreaded surface includes a spherical portion mateable with the spherical portion of the first head.
13. The locking system of claim 11 , wherein the first head includes a spherical cavity.
14. The locking system of claim 13 , further comprising a locking washer and a pivot pin located within the spherical cavity and engaging the first head with the second head.
15. The locking system of claim 11 , wherein the bone-anchoring portion is configured to angulate relative to the second head such that a longitudinal axis through the bone-anchoring shaft can be at various angles relative to a longitudinal axis through the second head.
16. The locking system of claim 11 , wherein the first head includes a driver engaging recess.
17. The locking system of claim 16 , wherein the second head includes a driver engagement.
18. The locking system of claim 11 , wherein the bone-engaging shaft includes an unthreaded portion and a threaded portion and an anchoring distal tip.
19. The locking system of claim 11 , wherein the second head includes a recess for a driver.
20. A method of locking a system, comprising:
providing member having a wall with an inner surface spaced a distance from an outer surface;
providing a fixation opening through the wall with a threaded surface and an unthreaded surface;
passing a fixation fastener through the provided fixation opening, the fixation fastener provided with a first head and a second head, the first head attached to a bone-anchoring shaft and the second head pivotably coupled to the first head.
21. The method of claim 20 , further comprising:
selecting an orientation of the bone-engaging shaft relative to the second head.
22. The method of claim 21 , further comprising:
locking fixation fastener to the provided member at least by threading the second head into the threaded surface of the fixation opening.
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US14/053,244 US20140058525A1 (en) | 2008-02-20 | 2013-10-14 | Acetabular Cup Fixation |
US14/489,601 US9351839B2 (en) | 2008-02-20 | 2014-09-18 | Acetabular cup fixation |
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US12/370,951 US20090210067A1 (en) | 2008-02-20 | 2009-02-13 | Acetabular Cup Fixation |
US13/299,663 US8556985B2 (en) | 2008-02-20 | 2011-11-18 | Acetabular cup fixation |
US14/053,244 US20140058525A1 (en) | 2008-02-20 | 2013-10-14 | Acetabular Cup Fixation |
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US14/489,601 Active US9351839B2 (en) | 2008-02-20 | 2014-09-18 | Acetabular cup fixation |
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US9351839B2 (en) | 2008-02-20 | 2016-05-31 | Biomet Manufacturing, Llc | Acetabular cup fixation |
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Also Published As
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US20120065736A1 (en) | 2012-03-15 |
US20150005892A1 (en) | 2015-01-01 |
US20090210067A1 (en) | 2009-08-20 |
US9351839B2 (en) | 2016-05-31 |
US8556985B2 (en) | 2013-10-15 |
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