Acetabular Cup Fixation
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.
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This application claims the benefit of U.S. Provisional Application No. 61/030,027, filed on Feb. 20, 2008. The entire disclosure of the above application is incorporated herein by reference.
INTRODUCTIONAcetabular 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.
SUMMARYThe 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:
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.
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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
1. An acetabular cup 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 including a first wall portion adjacent to the inner surface and a second wall portion adjacent to the outer 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 first head portion engageable with the first wall portion and a second head portion engageable with the second wall portion.
2. The acetabular cup system of claim 1, wherein the first head portion is externally threaded and the first wall portion is internally threaded.
3. The acetabular cup system of claim 2, wherein the second head portion is unthreaded and tapered and the second wall portion is unthreaded and tapered forming a taper lock connection with the second head portion, and wherein the first head portion is contiguous to the second head portion.
4. The acetabular cup system of claim 3, wherein the first head portion is cylindrical and the first wall portion is cylindrical.
5. The acetabular cup system of claim 3, wherein the first head portion is tapered and the first wall portion is tapered.
6. The acetabular cup system of claim 1, wherein the second head portion is externally threaded and the second wall portion is internally threaded.
7. The acetabular cup system of claim 6, wherein the first head portion is unthreaded and the first wall portion is unthreaded.
8. The acetabular cup system of claim 7, wherein the first head portion is tapered and the first wall portion is tapered.
9. The acetabular cup system of claim 1, wherein the first head portion is substantially spherical and unthreaded and the second head portion is cylindrical and threaded with self-tapping threads.
10. The acetabular cup system of claim 9, wherein the fixation opening is unthreaded and the first wall portion is substantially spherical and the second wall portion is substantially cylindrical.
11. The acetabular cup system of claim 1, wherein the first head portion is substantially spherical.
12. The acetabular cup system of claim 11, wherein the first head portion is externally threaded.
13. The acetabular cup system of claim 12, wherein the first wall portion is substantially spherical and threaded.
14. An acetabular cup 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 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; 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 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.
15. The acetabular cup system of claim 14, wherein the first head portion is substantially cylindrical and the first wall portion is substantially cylindrical.
16. The acetabular cup system of claim 14, wherein the first head portion is tapered and the first wall portion is tapered.
17. An acetabular cup 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 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.
18. The acetabular cup system of claim 17, wherein the threaded portion of the fixation fastener is tapered.
19. The acetabular cup system of claim 17, wherein the fixation opening is tapered.
20. An acetabular cup 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 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.
Type: Application
Filed: Feb 13, 2009
Publication Date: Aug 20, 2009
Applicant: Biomet Manufacturing Corp. (Warsaw, IN)
Inventor: Jason D. Meridew (Warsaw, IN)
Application Number: 12/370,951
International Classification: A61F 2/32 (20060101); A61B 17/58 (20060101);