# US 9,872,775 B2 · Apparatus for trialing a modular humeral head > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,872,775 B2 - Document ID: US9872775B2 - Status: Granted - Kind: B2 - Application number: 14/176,693 - Filed: 2014-02-10 - Published: 2014-06-05 - Granted: 2018-01-23 - Earliest claimed: 2005-03-09 - Assignees: Biomet Manufacturing, LLC - Applicants: Biomet Manufacturing, LLC - Inventors: Nathan A. Winslow - Web page: https://patentgrep.com/patent/US9872775B2 ## CPC - A61F 2/4014: {Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts} - A61F 2/4657: {Measuring instruments used for implanting artificial joints (for surgical instruments A61B90/06)} - A61F 2/4684: {Trial or dummy prostheses} - A61F 2/4059: {Humeral shafts} - A61F 2002/30369: {Limited lateral translation of the protrusion within a larger recess} - A61F 2002/30433: {using additional screws, bolts, dowels, rivets or washers e.g. connecting screws} - A61F 2002/30507: {using a threaded locking member, e.g. a locking screw or a set screw} - A61F 2002/3054: {about a connection axis or implantation axis for selecting any one of a plurality of radial orientations between two modular parts, e.g. Morse taper connections, at discrete positions, angular positions or continuous positions} - A61F 2002/30553: {for adjusting a position by translation along an axis} - A61F 2002/30604: {modular} - A61F 2002/30616: {Sets comprising a plurality of prosthetic parts of different sizes or orientations} - A61F 2002/30617: {Visible markings for adjusting, locating or measuring} - A61F 2002/4018: {Heads or epiphyseal parts of humerus} - A61F 2002/4033: {with an integral complete or partial peripheral collar at its base} - A61F 2002/4037: {Connections of heads to necks} - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## Abstract The present disclosure is directed to a modular shoulder prosthesis measuring device having an adjustable radial offset provided by relative rotation of an adapter interdisposed between the stem and the head. Specifically, the interface configuration between the stem and the adapter, as well as between the adapter and the head are designed such that relative positioning of these components provides a continuous adjustment in the radial offset. Indicia are provided to precisely determine the magnitude and direction of the adjustment being made. ## Claims ### Claim 1 An adjustable prosthesis comprising: a stem having a proximal face; a humeral head having an articulation surface and a bottom face opposite the articulation surface, the bottom face defining an elongated aperture having first and second ends defining a generally flat interface surface; and an adapter interposed between the proximal face and the bottom face, the adapter defining a cylindrical coupling tapered portion having a centerline which is generally perpendicular to the interface surface, the adapter having a generally planar bearing surface configured to engage the interface surface so as to allow continuous linear movement of the generally planar bearing surface with respect to the interface surface and of the humeral head with respect to the adapter from a first position to a second position in a direction perpendicular to the centerline and within the elongated aperture, the adapter and elongated aperture defining a variable sized cavity therebetween when the generally planar bearing surface is engaged with the interface surface. ### Claim 2 (depends on 1) The adjustable prosthesis of claim 1, wherein the adapter is rotationally positionable on the stem to provide a first adjustment and relatively linearly positionable to the head to provide a second adjustment so as to couple the head to the stem in a fixed orientation within a range of orientations defined by the first and second adjustments. ### Claim 3 (depends on 2) The adjustable prosthesis of claim 2, wherein the range of orientations is a 1-5 mm radial offset. ### Claim 4 (depends on 1) The adjustable prosthesis of claim 1, wherein the adapter is rotationally coupled to the stem such that relative angular positioning of the adapter on the stem will effect a first radial offset, and the adapter is linearly coupled to the head such that relative positioning of the adapter with respect to the head will effect a linear offset. ### Claim 5 (depends on 1) The adjustable prosthesis of claim 1, wherein the adapter and the humeral head each include indicia that indicate a relative position of the humeral head with respect to the adapter. ### Claim 6 (depends on 1) The adjustable prosthesis of claim 1, wherein the humeral head includes rotational indicia along the articulation surface for determining a relative rotation of the humeral head with respect to the stem. ### Claim 7 (depends on 1) The adjustable prosthesis of claim 1, wherein a through bore is defined through the articulation surface of the head and is in communication with the elongated aperture to receive a coupling member to couple the humeral head to the adapter. ### Claim 8 (depends on 7) The adjustable prosthesis of claim 7, wherein the through bore has a slot portion and a circular portion that facilitates transverse movement of the coupling member within the through bore. ### Claim 9 (depends on 1) The adjustable prosthesis of claim 1, wherein the stem further comprises a taper coupling feature. ### Claim 10 (depends on 9) The adjustable prosthesis of claim 9, wherein the cylindrical coupling tapered portion of the adapter is positionable within the taper coupling feature of the stem to couple the adapter to the stem.