Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1994-12-14
1997-07-08
Milano, Michael J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
A61F 238
Patent
active
056456026
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention relates to a joint prostesis for permanent anchorage in the bone tissue of one of the articulatory parts of a joint in a human body, in particular the femur side of a knee joint, primarily intended to be fitted in one operation only, wherein said prosthesis comprises an attachment part, intended to be anchored in the human bone tissue by means of a fixture, and an articulation element adapted to fit the attachment part.
BACKGROUND OF THE INVENTION
The present invention is a development of a joint prosthesis of the kind disclosed in U.S. Pat. No. 5,037,439, to Albrektsson et al. This document thus inter alia discloses a femoral part of a knee joint prosthesis comprising an articulation element having an inner surface in the shape of an L. This L-shaped articulation element comprises two essentially planar parts oriented perpendicularly to each other intended to be connected to a L-shaped recess cut in the femur bone tissue. The prosthesis also comprises an elongate intermediate element with a first side intended to bear against the vertical part of the L-shaped recess in the bone by means of at least one fixture, and a second opposite side intended to bear against one of the planar parts of the articulation element. The intermediate element is in the shape of an attachment bar having flanges provided on said second side intended as a means for holding the articulation element. The back part of the articulation element is also provided with an elongated means for attachment, having a T-shaped cross section area, intended to be inserted in said attachment bar and be locked in a predetermined position by a locking device which consists of locking lugs in the flanges of the intermediate element.
This prior art discloses a femoral part of a knee joint prosthesis which can be fitted in one operation only, which is advantageous since two operations may entail a greater risk of infection and are troublesome for the patient.
The present invention is an improvement of the prosthesis described above. Due to its shape it has a large area for osseointegration resulting in a good osseointegration in the bone tissue and thus a stable and resistant anchoring in the femur. The parts of the prosthesis all have a relatively simple construction and are easy to fit during one operation. The fitting of the articulation element to the attachment part is also simple and stable.
Other similar prior art is disclosed for instance in EP 0 183 669.
BRIEF DESCRIPTION OF THE INVENTION
The joint prosthesis of the invention is characterized in that the attachment part comprises a first and a second essentially planar parts oriented generally at an angle relative to each other and joined by means of an intermediate part, said attachment part having an inner surface intended to bear on the bone tissue, and an outer surface intended to support the articulation element, said outer surface being provided with flanges at the two sides oriented mainly in parallel with the directon of the articulational movment of the joint, said flanges are each being provided with a groove being parallel with one of said planar parts which groove is intended to guide and hold corresponding beads or flanges on said articulation element when said articulation element is slid onto said attachment part, said attachment part also being provided with a locking device for locking said articulation element when said element entirely has been slid onto said attachment part, said articulation element having a surface being shaped complementary to said outer surface of the attachment part, said beads projecting from one respective side of said articulation element and having a shape complementary to the shape of said grooves in said flanges.
The joint prosthesis according to the invention preferably is used in the human knee joint, as a femoral prosthesis, but it can also be used in other similar joints.
BRIEF DESCRIPTION OF THE APPENDED DRAWINGS
FIG. 1 show one view of an attachment part,
FIG. 2 shows a section alon
REFERENCES:
patent: 4795468 (1989-01-01), Hodorek et al.
patent: 4838891 (1989-06-01), Branemark et al.
patent: 4944757 (1990-07-01), Martinez et al.
patent: 4950298 (1990-08-01), Gustilo et al.
patent: 5037439 (1991-08-01), Albrektsson et al.
patent: 5080674 (1992-01-01), Jacobs et al.
patent: 5108442 (1992-04-01), Smith
patent: 5271737 (1993-12-01), Baldwin et al.
Albrektsson Bjorn
Carlsson Lars Valter
Jacobsson Carl Magnus Gosta
Rostlund Tord Valter
Wennberg Stig Gosta
Astra Aktiebolag
Milano Michael J.
LandOfFree
Knee joint prosthesis does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Knee joint prosthesis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Knee joint prosthesis will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2406760