US 7,452,381 B2Granted

Radial head replacement system

AssigneeMayo Foundation for Medical Education and Research

InventorScott P. Steinmann

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Abstract

A radial head replacement system includes a radial head replacement, an apparatus for guiding the resection of a radial head, and a kit including bone plug and bone plug insertion instrument. The radial head replacement has a separate adjustable head portion that may be secured on an implanted stem such that the implanted radial head replacement smoothly interfaces with the capitellum of the humerus. In another form, the radial head replacement uses crossed bone screws that serve to more securely anchor the stem of the radial head replacement in the intramedullary canal of the radius. The resection guide includes a movable cutting guide which ensures a precise resection of the radial head and thereby allows for better positioning of the implanted radial head replacement. The bone plug limits the travel of bone cement beyond the area of affixation of the stem portion of a radial head replacement to the radius.

Claims16

Dependent claims

A modular prosthesis for replacing an end portion of a bone, the prosthesis comprising:

a stem dimensioned to be received in the intramedullary canal of the bone;
a head having an outer wall defining an interior space dimensioned such that the head can be placed over an end portion of the stem, the outer wall having an opening, the outer wall being dimensioned such that the head can be translated in an axial direction in relation to an axis of the stem and the head can be translated in a transverse direction in relation to the axis of the stem when the end portion of the stem is placed in the interior space of the head, the outer wall of the head of the prosthesis including a concave surface dimensioned to interface with another bone when the head of the prosthesis is secured to the stem;
and
a screw dimensioned to be arranged in the opening,
wherein the screw is suitable for contacting the end portion of the stem when arranged in its associated opening to secure the head to the stem by constraining movement of the head in the axial direction and in the transverse direction, and
wherein the opening is in a lateral direction in relation to the axis of the stem, and
wherein an interior surface of the outer wall of the head adjacent the opening is spaced from the end portion of the stem when the head is secured to the stem, and
wherein the end portion of the stem includes an end surface and a side surface extending away from the end surface, the side surface having a curved periphery when viewed in a cross-section transverse to the axis of the stem, and
wherein the screw contacts the side surface of the end portion of the stem when the head is secured to the stem.

6 more elements

A modular prosthesis for replacing an end portion of a bone, the prosthesis comprising:

a stem dimensioned to be received in the intramedullary canal of the bone;
a head having an outer wall defining an interior space dimensioned such that the head can be placed over an end portion of the stem, the outer wall having an opening, the outer wall being dimensioned such that the head can be translated in a first transverse direction in relation to an axis of the stem and the head can be translated in a second transverse direction in relation to the axis of the stem at an angle to the first transverse direction when the end portion of the stem is placed in the interior space of the head, the outer wall of the head of the prosthesis including a concave surface dimensioned to interface with another bone when the head of the prosthesis is secured to the stem;
and
a screw dimensioned to be arranged in the opening,
wherein the screw is suitable for contacting the end portion of the stem when arranged in its associated opening to secure the head to the stem by constraining movement of the head in the first transverse direction and in the second transverse direction, and
wherein the opening is in a lateral direction in relation to the axis of the stem, and
wherein an interior surface of the outer wall of the head adjacent the opening is spaced from the end portion of the stem when the head is secured to the stem, and
wherein the end portion of the stem includes a top end surface and a side surface extending away from the end surface, the side surface having a curved periphery when viewed in a cross-section transverse to the axis of the stem, and
wherein the screw contacts the side surface of the end portion of the stem when the head is secured to the stem.

6 more elements

A modular prosthesis for replacing an end portion of a bone, the prosthesis comprising:

a stem dimensioned to be received in the intramedullary canal of the bone;
a head having an outer wall defining an interior space dimensioned such that the head can be placed over an end portion of the stem, the outer wall having an opening, the outer wall being dimensioned such that the head can be moved in an axial direction in relation to an axis of the stem and the head can be moved in a transverse direction in relation to the axis of the stem when the head is placed over the end portion of the stem;
and
a screw dimensioned to be arranged in the opening,
wherein the screw is suitable for contacting the end portion of the stem when arranged in its associated opening to secure the head to the stem by constraining movement of the head in the axial direction and in the transverse direction, and
wherein the opening is in a lateral direction in relation to the axis of the stem, and
wherein an interior surface of the outer wall of the head adjacent the opening is spaced from the end portion of the stem when the head is secured to the stem, and
wherein the end portion of the stem includes a top end surface and a side surface extending away from the end surface, the side surface having a curved periphery when viewed in a cross-section transverse to the axis of the stem, and
wherein the screw contacts the side surface of the end portion of the stem when the head is secured to the stem, and
wherein the prosthesis is adapted to replace a radial head, and
wherein the head of the prosthesis is elliptical, and
wherein the outer wall of the head of the prosthesis includes a concave surface dimensioned to interface with the capitellum of the humerus and a periphery surface dimensioned to interface with the radial notch of the ulna when the head of the prosthesis is secured to the stem.

9 more elements

A modular prosthesis for replacing an end portion of a bone, the prosthesis comprising:

a stem dimensioned to be received in the intramedullary canal of the bone;
a head having an outer wall defining an interior space dimensioned such that the head can be placed over an end portion of the stem, the outer wall having an opening, the outer wall being dimensioned such that the head can be moved in a first transverse direction in relation to an axis of the stem and the head can be moved in a second transverse direction in relation to the axis of the stem at an angle to the first transverse direction when the head is placed over the end portion of the stem;
and
a screw dimensioned to be arranged in the opening,
wherein the screw is suitable for contacting the end portion of the stem when arranged in its associated opening to secure the head to the stem by constraining movement of the head in the first transverse direction and in the second transverse direction, and
wherein the opening is in a lateral direction in relation to the axis of the stem, and
wherein an interior surface of the outer wall of the head adjacent the opening is spaced from the end portion of the stem when the head is secured to the stem, and
wherein the end portion of the stem includes an end surface and a side surface extending away from the end surface, the side surface having a curved periphery when viewed in a cross-section transverse to the axis of the stem , and
wherein the screw contacts the side surface of the end portion of the stem when the head is secured to the stem, and
wherein the prosthesis is adapted to replace a radial head, and
wherein the head of the prosthesis is elliptical, and
the outer wall of the head of the prosthesis includes a concave surface dimensioned to interface with the capitellum of the humerus and a periphery surface dimensioned to interface with the radial notch of the ulna when the head of the prosthesis is secured to the stem.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/767,642Filed 29 Jan 2004 · us provisional application
Priority: 30 Jan 2003
Published: US 2004/0186580 A123 Sep 2004
Granted: 18 Nov 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

A61F 2/3804
For elbows or knees: for elbows
A61B 17/15
Surgical saws: guides therefor
A61F 2/4614
For insertion or extraction of endoprosthetic joints or of accessories thereof: of plugs for sealing a cement-receiving space
A61F 2002/3827
For elbows: radial components