Back to results
US 8,801,797 B2Granted
Joint socket for a hip endoprosthesis
AssigneeSmith & Nephew Orthopaedics AG
InventorMartin Imhof
Life of this patent
Estimating the term…
Abstract
A joint socket of a hip endoprosthesis includes a socket shell implantable in the pelvic bone and a socket insert for providing a bearing for the joint head. The socket shell has an accommodating space having a conical inner surface in which the spherical outer surface of the socket insert is inserted. As a result, the socket insert can be clamped in a self-locking manner in any desired position of rotation and tilt in the accommodating space of the socket shell.
Claims30
A joint socket for a hip endoprosthesis, comprising:
- a socket shell configured to be implanted in the pelvic bone of a patient, the socket shell having an inner surface that defines an accommodating space extending about an axis of rotation;
- and
- a socket insert configured to provide a bearing for a joint head of a prosthesis stem, a spherical outer surface of said socket insert configured to be disposed in the accommodating space of the socket shell and contact the inner surface of the socket shell along a line of contact that is concentric with the axis of rotation of the accommodating space of the socket shell, the line of contact being surrounded by and intersecting the spherical outer surface of the socket insert, the socket insert coupleable in a self-locking manner within said accommodating space along said line of contact,
- wherein the inner surface of the socket shell tapers toward a pole of the shell in a region on either side of said line of contact in such a manner that a radius of curvature of the taper of the inner surface of the socket shell in the region of said line of contact is greater than the spherical radius of the outer surface of said socket insert at said line of contact when the shell and insert are in contact with each other.
1 more element
A joint socket for a hip endoprosthesis, comprising:
- a socket shell configured for implantation in a pelvic bone, the socket shell having an inner surface that defines an accommodating space extending about an axis of rotation;
- and
- a socket insert comprising a bearing surface configured to receive a joint head of a prosthesis stem, the socket insert comprising a spherical outer surface configured for insertion in the accommodating space of the socket shell and configured to contact the inner surface of the socket shell along a line of contact that is concentric with the axis of rotation of the accommodating space, the socket insert coupleable in a self-locking manner within said accommodating space,
- wherein the inner surface of the socket shell tapers toward a pole of the shell in a region on either side of said line of contact in such a manner that a radius of curvature in the region is greater than the spherical radius of the outer surface of said socket insert.
1 more element
A joint socket for a hip endoprosthesis, comprising:
- a socket shell having an inner surface that defines an accommodating space extending about an axis of rotation, at least a portion of the accommodating space is in the form of a straight circular cone, the straight circular cone having a cone angle between about 4 degrees and 10 degrees;
- and
- a socket insert having an outer surface, the outer surface is spherically shaped at least in a region in which the outer surface of the socket insert comes into contact with the inner surface of the straight circular cone when in use.
A joint socket for a hip endoprosthesis, comprising:
- a socket shell having an inner surface comprising a tapered portion that extends about an axis of rotation and comprises a taper, the tapered portion at least partially defining an accommodating space configured to receive a socket insert;
- a socket insert having an outer surface, the outer surface comprising a spherically shaped region having a radius of curvature, the socket insert being configured to contact the socket shell on the tapered portion along a line of contact concentric with the axis of rotation of the tapered portion when the socket insert is inserted into the accommodating space of the socket shell;
- wherein a radius of curvature of the taper of the tapered portion surrounding the line of contact is greater than the radius of curvature of the spherically shaped region of the socket insert.
Dependencies are inferred from the claim text.