MULTI-COMPONENT SHOULDER IMPLANT ASSEMBLY WITH DUAL ARTICULATING SURFACES
An implant assembly for re-establishing a glenohumeral joint between scapula and humerus bones. A substantially spherical shaped element is adapted to being mounted a reconditioned glenoid cavity defined in the scapula and exhibits a second convex exterior surface projecting from the bone surface. A receiver component has a base with a first convex bone contacting surface adapted to being mounted to a reconditioned humeral head associated with the humerus, the receiver component exhibiting a second convex exterior surface projecting away from the bone surface and exposing a concave profile exhibiting only a rim edge therebetween at an outer exposed seating end of said second convex surface for supporting the components in inter-articulating fashion.
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This Application is a Division of application Ser. No. 13/592,738 filed on Aug. 23, 2012. Application Ser. No. 13/592,738 claims the benefit of U.S. Provisional Application 61/526,388 filed on Aug. 23, 2011. Application 13/592,738 claims the benefit of U.S. Provisional Application 61/526,404 filed on Aug. 23, 2011, the contents of which are incorporated herein in their entirety.
FIELD OF THE INVENTIONThe present invention is directed to a shoulder implant assembly and, more specifically, to a multi-component implant assembly incorporating a ball and a receiver mounted to first and second shoulder joint defining bones. An optional third substantially spherical shaped and intermediate defining component establishes dual and spaced apart universal and articulating surfaces with the fixedly mounted ball and receiver providing evenly distributed wear profiles for increased useful life of the implant, as well as relieving associated ligament tension.
BACKGROUND OF THE INVENTIONThe prior art discloses various types of artificial implants, such as replacing damaged natural joint constructions including those for the shoulder. Examples of these include each of the modular humeral head resurfacing system of Winslow et al., U.S. 2006/0009852 and U.S. 2005/0107882, each of which incorporates a two piece humeral component for use in joint arthroplasty which is adapted to be implanted into a joint and engaged by a likewise implanted socket component.
SUMMARY OF THE INVENTIONThe present invention discloses an implant assembly for re-establishing a glenohumeral joint between a scapular and humerus. The implant includes a ball adapted to being mounted to a reconditioned glenoid cavity defined in the scapula. A receiver is adapted to being mounted to a reconditioned humeral head associated with the humerus.
The substantially spherical shaped element is interposed between the ball and receiver and establishes first and second articulating surfaces. A concave recess is defined in an exposed face of the ball for seating in articulating fashion a portion of the spherical element.
A concave recess is defined in the spherical shaped element for seating in articulating fashion an exposed portion of the scapula mounted ball. Each of the ball, spherical element and receiver is constructed of an alternating material including at least one of a polymer, polymer composite, metal, metal composite or polymer/metal admixture.
Reference will now be made to the attached drawings, when read in combination with the following detailed description, wherein like reference numerals refer to like parts throughout the several views, and in which:
As will be described in additional detail with reference to the succeeding variants, the present invention discloses a multi-component shoulder implant assembly for providing an in-situ and reconditioned installation option which is an improvement over other conventional joint implant installations.
Prior to describing in detail the configuration of the multi-component shoulder implant depicted in
An abbreviated and incomplete description of the scapula further includes, at strategic locations a coracoid process 4 and spine connected acromion 5, in the proximity of which is configured the glenoid cavity 6. The humerus 3 terminates, in relevant part, at an upper end located humeral head 7 (
The three joints of the shoulder further include each of the glenohumeral, acromioclavicular and sternoclavicular joints. The glenohumeral joint, see as identified at 9 in
As is best depicted in the prior art view of
With reference now to the embodiments of the invention set forth in
The above stated, and referring initially to each of
A further receiver component includes a convex bone contacting surface (see at 18), a stem mounting portion 20 projecting from a lower end location of the bone contacting surface 18. The receiver component exhibits a substantially spherical shape with a main convex surface (see at 21 and which likewise defines an annular or perimeter boundary with the convex bone contacting surface 18).
A reduced dimension concave profile 22 is configured at an outer exposed seating end of the main convex surface 21 of the receiver component, the concave profile 22 exhibiting only a rim edge therebetween at an outer exposed seating end of the main convex surface 21 and is sized for seating directly the convex profile of the pseudo spherical ball element 16 (see again
The ball element 16 and receiver component 18 are each constructed of any suitable material including any type of plastic, metal or admixed composite. While not limited to any specific variant, the material selection for these components can alternate between any suitable material (e.g. heavy duty, wear resistant and sanitary polymeric, polymeric composite, surgical steel/aluminum, other metal or metal composite, as well as plastic/metal admixture.
The exploded view of
Referring again to the existing arrangement of ligaments, tendons and muscles depicted in the Prior Art views of
Having now described our invention, other and additional preferred embodiments will become evident to those skilled in the art to which it pertains, and without deviating from the scope of the appended claims.
Claims
1. An implant assembly for re-establishing a glenohumeral joint between a scapula and humerus, comprising:
- a pseudo-spherical element having a base with a first convex bone contacting surface, said base terminating in a stem portion extending therefrom such that the base is adapted to mount to a reconditioned glenoid cavity defined in the scapula, said element exhibiting a second convex exterior surface projecting from the bone surface;
- a receiver component having a base with a first convex bone contacting surface adapted to being mounted to a reconditioned humeral head associated with the humerus, said receiver component exhibiting a second convex exterior surface projecting away from the bone surface and exposing a concave profile exhibiting only a rim edge therebetween at an outer exposed seating end of said second convex surface, said second convex exterior surface of said pseudo-spherical shaped element articulating relative to said concave profile, a first axis extending through a central location of said concave profile defining a non collinear angle relative to a second axis extending through a centerline of said stem portion of said receiver component.
2. The implant assembly as described in claim 1, each of said pseudo-spherical shaped element and receiver component being constructed of at least one of a polymer, polymer composite, metal, metal composite or polymer/metal admixture.
3. The implant assembly as described in claim 1, said first and second axes defining as substantially right angle.
Type: Application
Filed: Apr 22, 2014
Publication Date: Aug 14, 2014
Applicant: Linares Medical Devices, LLC (Auburn Hills, MI)
Inventors: Miguel A. Linares (Bloomfield Hills, MI), Miguel A. Linares, JR. (Bloomfield Hills, MI)
Application Number: 14/258,492
International Classification: A61F 2/40 (20060101);