Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Reexamination Certificate
1998-09-11
2001-03-27
Milano, Michael (Department: 3738)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
Reexamination Certificate
active
06206925
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. § 119 of French Patent Application No. FR 97 11603, filed on Sep. 12, 1997.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to improvements made to sphere-type shoulder prostheses of the kind which comprise a rod which is anchored into the humeral canal and a hemispherical cup which can interact with the shoulder socket.
The prosthesis according to the invention, which may or may not be associated with a prosthetic socket, allows for the surgical treatment of degenerative afflictions of gleno-humeral arthrosis, and also of other afflictions. Furthermore, the prosthesis according to the invention is also intended for cephalo-tuberosital fractures which are not accessible to conservative surgery, and also to any painful syndrome of the shoulder.
2. Description of Background and Relevant Information
French patent application No. 2 727 002 of which the present applicant is proprietor discloses a humeral prosthesis with a sphere comprising, in the metaphyseal region of the humeral rod, a cylindrical housing with a spherical end into which a sphere designed to receive a hemispherical cup is inserted, while binding means allow these to be immobilized in a determined position with respect to the axis of the rod.
Also, French patent application No. 2 685 633 of which the applicant is proprietor discloses a modular humeral prosthesis made up of three elements one of which is an anchoring rod provided with a metaphyseal region formed of an oblique bearing face. The second element is a distance piece in the form of a wedge, one of the end faces of which fits on the bearing face of the rod. The third element of the prosthesis is a hemispherical cup, the base of which is fixed with respect to the second end face of the distance piece. This attachment, which is offcentered with respect to the geometric axis of the cup, allows for angular adjustment of the latter with respect to the distance piece.
Such prostheses have certain drawbacks regarding the systems for immobilizing the spheres, which are inaccessible once the prostheses have been inserted into the humeral canal, because the binding screws are located inside the bone cavity.
Furthermore, it can be observed that, because a sphere is being used, there are an infinite number of relative positions between rod and sphere, and this makes reproducing on the implant the geometry measured using the test piece impossible.
SUMMARY OF THE INVENTION
The improvements which are the subject of the present invention aim to allow a humeral prosthesis to be produced which overcomes the above drawbacks.
The humeral prosthesis with a sphere, comprising a rod which can be anchored into the humeral canal, a hemispherical cup which can interact with the shoulder socket and a sphere providing the connection between the rod and the cup, and provides for indexing the sphere and/or the cup with respect to the rod in a finite number of combined angular positions &agr; and &bgr; of the cup with respect to the rod, which positions are obtained from measurements read off from a test piece or some other method in order, using binding mechanisms, to immobilize the sphere and/or the cup on the rod before it is fitted in the humeral canal, the angles &agr; and &bgr; respectively representing the angle of inclination in the frontal plane, and the anteversion or retroversion angle of inclination with respect to the frontal plane about the axis of the rod. [sic]
The humeral prosthesis comprises a combination of a fixed pointer with a reference mark and a recess opposite the axis of the hole which allows the angles &agr; and &bgr; to be reproduced.
The humeral prosthesis comprises a hole that receives the binding mechanisms which is located along an axis that does not run through the center of the sphere and/or the cup so as to prevent any relative movement between the sphere and/or the cup with respect to the rod.
The humeral prosthesis comprises a rod which in its metaphyseal region comprises a cavity capable of accommodating a sphere interacting with the cup, while binding mechanisms provided on the rod allow the sphere and the cup to be immobilized.
The humeral prosthesis comprises a rod which in its metaphyseal region is secured to a sphere which interacts with a housing formed in the cup, while binding mechanisms provided on the cup allow it to be immobilized on the sphere.
The humeral prosthesis comprises a rod which in its metaphyseal region comprises a housing in the middle of which there is drilled a hole with a tapering profile receiving a peg of the same profile extending from a flange placed in the housing, the flange being secured, on the opposite side from the peg, to a sphere which interacts with the housing provided in the cup.
The humeral prosthesis comprises an axis of the sphere which is laterally offset by a distance with respect to the axis of the flange, so as to allow the cup to be offcentered.
REFERENCES:
patent: 5358526 (1994-10-01), Tornier
patent: 5702457 (1997-12-01), Tornier
patent: 5741335 (1998-04-01), Gerber et al.
patent: 19509037 (1996-09-01), None
patent: 0549480 (1993-06-01), None
patent: 0639359 (1995-02-01), None
patent: 0679375 (1995-11-01), None
patent: 0712617 (1996-05-01), None
patent: 0715836 (1996-06-01), None
patent: 2685633 (1993-07-01), None
patent: 2727002 (1996-05-01), None
patent: WO 96/17553 (1996-06-01), None
patent: WO 97/25943 (1997-07-01), None
Greenblum & Bernstein P.L.C.
Milano Michael
Tornier SA
LandOfFree
Elbow prosthesis with indexed sphere does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Elbow prosthesis with indexed sphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elbow prosthesis with indexed sphere will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2484626