Metaphyseal referencing technique and instrument
AssigneeHowmedica Osteonics Corp.
InventorsAlexander Paul Wolfe, David R. Stump
Life of this patent
Estimating the term…
Abstract
A system for sizing the resected surface to provide metaphyseal referencing and to properly guide a tool into a central portion of the canal in the diaphysis. The system can include a sizing feature to approximate the size of the metaphysis. The system can also include a base configured to contact the metaphysis and a guide feature configured to guide a tool along a central portion of the canal in the diaphysis.
Claims37
A humeral guide for providing proper alignment of a stem portion of an implant within a diaphysis of a humerus bone and a proximal portion of the implant in a metaphysis of the humerus bone, the humeral guide comprising:
- a base comprising:
- a first surface configured to be disposed within a cavity formed in the metaphysis such that the first surface contacts the metaphysis, and
- a second surface separated from the first surface by a depth stop, the depth stop extending radially outwardly from the first surface and including a contact surface configured to engage a recessed or resected surface of the humerus, wherein the first surface of the base is sized to fit within an outer periphery of the metaphysis;
- and
- a guide feature extending from the second surface and defining a lumen having a central axis, the lumen being configured to guide a tool into a diaphysis of the humerus bone along a central portion of a canal in the diaphysis, the guide feature positioned at a superior region of the base.
A method of preparing a humerus bone, the method comprising:
- resecting an end portion of the humerus bone to form a resected surface defining a resection plane;
- sizing a proximal portion of the humerus bone;
- positioning a central guide pin in the humerus bone;
- reaming a proximal portion of the humerus bone to form a cavity;
- selecting a humeral guide based on a size of the proximal portion of the humerus bone, the humeral guide comprising:
- a base including:
- a first surface configured to be disposed within the cavity such that the first surface contacts a metaphysis of the humerus bone,
- a second surface separate from the first surface by a depth stop, the depth extending radially outwardly from the first surface and including a contact surface configured to engage at least one of the resected surface of the humerus or a recessed surface of the humerus, and
- a guide feature extending from the second surface and defining a lumen having a central axis, the lumen configured to guide a tool into a diaphysis of the humerus bone along a central portion of a canal in the diaphysis, the guide feature positioned at a superior region of the base;
- positioning the selected humeral guide on the proximal portion of the humerus bone such that the first surface is disposed within the cavity and contacts the metaphysis of the humerus bone;
- guiding a tool through the lumen defined by the guide feature of the selected humeral guide and along the central portion of the canal in the diaphysis;
- and
- forming a pilot hole using the tool.
A system sizing and guiding a tool into a diaphysis of a humerus bone, the system comprising:
- a sizing feature for sizing a proximal portion of the humerus bone;
- a base comprising:
- a first surface configured to be disposed within a cavity formed in a metaphysis of the humerus bone such that the first surface contacts a proximal portion of the humerus bone, and
- a second surface separated from the first surface by a depth stop, the depth stop extending radially outwardly from the first surface and including a contact surface configured to engage a recessed or a resected surface of the humerus;
- and
- a guide feature extending from the second surface and defining a lumen having a central axis, the lumen configured to guide a tool into a diaphysis of the humerus bone along a central portion of a canal in the diaphysis.
Dependencies are inferred from the claim text.