1. Field of the Invention
The present invention discloses an artificial joint assembly, such as is particularly configured for employing as a retrofit knee joint, and which combines multiple artificial components incorporated into first and second reconditioned joint defining surfaces for providing increased wear life in tandem with evenly distributed wear pattern/profile as well as enhanced flexibility and mobility.
2. Background of the Relevant Art
The prior art is well documented with examples of artificial knee implant assemblies. These include such as the spherical knee joint prosthesis of Bosredon, U.S. Pat. No. 6,117,175, the total knee implant of Byrd et al., US 2010/0191342 and the artificial implant component and method for securing disclosed in Elias, U.S. Pat. No. 5,480,443.
The present invention discloses a multi-component joint assembly incorporated into reconditioned end surfaces established between an upper bone and an opposing lower bone. The assembly includes a first component anchored into the upper reconditioned bone end surface and exhibiting a first exposed support surface and second component anchored into the lower reconditioned bone end surface and exhibiting a second exposed support surface. A spherical shaped component is supported in at least one of eccentric rotational and linear/arcuate translatable fashion between the first and second anchored components.
Additional features include at least one of said components further exhibiting an arcuate and optionally inwardly flared track support surface. At least one of the components further exhibits a hemispherical recess for substantially seating the spherical shaped component. Other features of the joint assembly include each of the first, second and spherical shaped components further being constructed of at least one of a metal, plastic, polymer or composite material.
In other applications, a first pair of components are arranged at a first side of the assembly, with a second identical pair arranged at an opposite second side, such as is typical of a retrofit knee joint assembly. In this fashion, a subset pair of these components may further be employed in a ½ implant assembly associated with a selected side of the joint defining bones.
Other features include the spherical shaped component further exhibiting a multi-layer composition including a softer outer layer and at least one harder interior layer which can further include first and second inner layers establishing an eccentric rotational interface therebetween.
A plurality of surface projecting bearings are mounted within an innermost spherical shaped portion of the spherical component, these facilitating the eccentric rotational interface. A grid pattern of lubricating grooves defined in a surface of an innermost spherical shaped portion of said spherical component facilitating the eccentric rotational interface.
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 disclosed with succeeding reference to the several depicted embodiments, the present invention discloses an artificial joint assembly, such as is particularly configured for employing as a retrofit knee joint, and which combines multiple artificial components incorporated into first and second reconditioned joint defining surfaces for providing increased wear life in tandem with evenly distributed wear pattern/profile as well as enhanced flexibility and mobility.
The joint assemblies described herein are particularly configured for such as in situ reconditioned installation within a patient's knee assembly (between the lower end of the upper femur bone and corresponding upper end of the lower tibia bone), however it is further understood that certain applications could in theory include other joint applications, either human or other mammalian. For purposes of ease and clarify of illustration, the various embodiments depicted further do not include reference to additional necessary components of the knee joints, such as including the patella (knee cap) and associated muscles, tendons and ligaments, the inclusion of which are assumed and which collectively define a functioning knee joint.
Referring now to
Although not shown, such reconditioning can be employed with minimal interference to such necessary additional elements of the joint including each of the patella or knee cap, ligaments, muscles and tendons. Without limitation, it is further understood that the joint assemblies described in each of the illustrated variants can be integrated into either of human or synthetic bones (such as which can also contemplate both human and synthetic bones in a single joint application), with such joint assemblies also capable of surgically implanted in either total or partial (as depicted in
Referring to
Each of the components a12-22 are constructed of any arrangement of metal, polymer, plastic, composite or other suitable material, with it further being understood that the individual pairs of components can be arrayed with any pattern of alternating materials, such that the outer (upper and lower affixed) pairs of components 12 & 14 and 16 & 18 can be constructed of a first material, with the intermediate positioned spherical (bearing) supports 20 and 22 being of a second material. In this fashion, the desired wear properties and profiles are adjusted in part based upon the material selection of the individual components with concurrent objectives being both equalization of overall wear patterns established between the respective pairs of components and determining those situations in which metal on metal or plastic on plastic contact between the components is either desired or, more often, not.
Both the upper bone secured tracks 12 and 14 and lower bone secured troughs 16 and 18 are anchored in seating fashion within the inner recessed profiles 6 and 8 of the femur 2 and tibia 4 bones by use of a suitable medical cement (it further being understood that suitable bone adhesion can also be assisted or promoted by inner marrow in given circumstances). The upper tracks 12 and 14 each exhibit and arcuate, inwardly flared exposed surface (see at 24 and 26 in
The lower bone secured inserts exhibiting seating troughs 16 and 18 each further include a generally semi-spherical shaped body with bottom convex surfaces which seat within the mating three dimensional recess profiles 8 established within the joint end face defining profiles of the lower tibia 4. The lower troughs 16 and 18 in turn exhibit upwardly facing and substantially semi-spherical inner recess 38 and 40 surrounded by upper lip or rim annular supporting edges 42 and 44. Inner opposing edge profiles of the troughs 16 and 18 are further defined by upward raised projections exhibiting inner opposing edges 46 and 48 which seat against the raised bridge location 9 defined in a mid location of the tibia end face again in the manner depicted in the assembled view of
The spherical shaped supports 20 and 22 are dimensioned so that they substantially seat within the inner recesses 38 and 40 (see again
This arrangement further enables the upper interface between the tracks 12 and 14 and spherical bearings 20 and 22 to permit the bearings to translate along the arcuate paths 24 and 26 defined in the upper tracks 12 and 14, concurrent with its rotation at both the upper tracks and lower trough 16 and 18 interfaces, such as occurring during bending motion of the knee. As again previously indicated, additional configurations of muscles, ligaments, tendons and patella (knee cap) are provided and can include both natural (pre-existing) and/or synthetic materials, such as which are concurrently implanted or reconstructed in order to provide a dynamic and long-term implantable assembly.
Referring now to
An eccentric rotatable interface is established between the intermediate 54 and innermost 56 layers, and which further includes a plurality of ball bearings 58 encapsulated within the inner most layer 56 with arcuate edge portions thereof projecting from the spherical surface thereof (see further in
Proceeding to
A pair of intermediate positioned spherical inter-movable supports 86 and 88 are provided similar in nature to the corresponding supports 20 and 22 illustrated in
Proceeding on to
A lower reconditioned surface profile, see at 108, is configured within the joint defining end face of the tibia bone 4 and anchors a lower bone secured concave support 110 further exhibiting a lower extending mounting stem or post 112 received within a corresponding mating recess (not shown) associated with an innermost machined location of the lower profile 108. The lower concave support 110 further exhibits an outwardly facing and substantially hemi-spherical bowl shape 114.
A single and intermediate positioned spherical inter-movable support 116 and which, similar to the previous variants, is eccentrically rotatable at both upper and lower seating locations, combined with linearly/arcuately translatable such as in relation to the inner elongated surface 106 of the upper seating support 102, while exhibiting both eccentric rotation as well as a limited degree of lateral or fore to aft adjustability within the seating pocket defined by the hemi-spherical bowl shape 114 within the lower anchored support 110. It is further envisioned that the respective materials of the upper 102 and lower 110 supports can exhibit either the same or different properties which render them respectively harder or softer and this, combined with the material properties of the intermediate positioned spherical support 116 again assists in establishing varying dynamic operating properties.
As further depicted in
As shown in
Referring finally to
The ear shaped components 156 and 158 are pre-assembled about a widened and pseudo roller/egg shaped support exhibiting a cylindrically flattened central location 164 with opposite spherical end profiles 166 and 168 (see again as best shown in
Having described my invention, other and additional preferred embodiments will become apparent to those skilled in the art to which it pertains, and without deviating from the scope of the appended claims.
The present application claims the priority of U.S. Ser. No. 61/526,708 filed Aug. 24, 2011.
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Number | Date | Country | |
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