# US 2022/0031464 A1 · Modular humeral head

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- Number: US 2022/0031464 A1
- Document ID: US20220031464A1
- Status: Published application
- Kind: A1
- Application number: 17/278,495
- Filed: 2018-10-02
- Published: 2022-02-03
- Earliest claimed: 2018-10-02
- Assignees: Howmedica Osteonics Corp.
- Applicants: Howmedica Osteonics Corp.
- Inventors: Kevin P. KNOX; Austin Wyatt MUTCHLER; Michael C. NELSON; David R. STUMP
- Web page: https://patentgrep.com/patent/US20220031464A1

## CPC

- A61F 2/4014: {Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts}
- A61F 2/30749: {Fixation appliances for connecting prostheses to the body}
- A61F 2/4003: {Replacing only the epiphyseal or metaphyseal parts of the humerus, i.e. endoprosthesis not comprising an entire humeral shaft (replacing only the epiphyseal or metaphyseal parts of the femur A61F2/3601)}
- A61F 2002/30332: {Conically- or frustoconically-shaped protrusion and recess}
- A61F 2002/30339: {Double cones, i.e. connecting element having two conical connections, one at each of its opposite ends}
- A61F 2002/30357: {Stepped cylinders, i.e. having discrete diameter changes}
- A61F 2002/30369: {Limited lateral translation of the protrusion within a larger recess}
- A61F 2002/30385: {the rib and groove having non-parallel, e.g. conically-tapered, cooperating sides, e.g. having a trapezoidal front cross-section}
- A61F 2002/30405: {made by screwing complementary threads machined on the parts themselves}
- A61F 2002/30433: {using additional screws, bolts, dowels, rivets or washers e.g. connecting screws}
- A61F 2002/30476: {locked by an additional locking mechanism}
- A61F 2002/30537: {adjustable}
- A61F 2002/30538: {for adjusting angular orientation}
- 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 2002/30545: {for adjusting a diameter}
- A61F 2002/30579: {with mechanically expandable devices, e.g. fixation devices}
- A61F 2002/30604: {modular}
- A61F 2002/30617: {Visible markings for adjusting, locating or measuring}
- A61F 2002/4018: {Heads or epiphyseal parts of humerus}
- A61F 2002/4037: {Connections of heads to necks}
- A61F 2002/4044: {Connections of necks to shafts}
- 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

A humeral head assembly is provided that includes an articular body and a coupler. The articular body includes a coupling portion disposed on a side of the articular body opposite an articular surface. The coupling portion includes a continuous zone of eccentricity adjustment. The coupler portion optionally includes one or more than one discrete position site. The coupler includes a first portion and a second portion opposite the first portion. The first portion is configured to mate with the coupling portion and the second portion is configured to mate with another member of a joint prosthesis. A coupling portion with the continuous range of eccentricity adjustment can be provided on a bone anchor and the eccentricity of another component can be selected by motion of a coupler, such as a tray for reverse humeral assemblies, along the coupling portion of the anchor.

## Claims

### Claim 1

A humeral head system, comprising an articular body comprising a convex articular surface and a coupling portion, the coupling portion disposed on a side of the articular body opposite the convex articular surface;
a coupler comprising a first portion configured to mate with the coupling portion and a second portion opposite the first portion, the second portion configured to mate with another member of a joint prosthesis; and
wherein the coupler is configured to provide a fixed rotational position between the articular body and the coupler to provide a selected degree of offset of the articular surface to the other member of the joint prosthesis.

### Claim 2 (depends on 1)

The humeral head system of claim 1, wherein the coupler comprises an offset window disposed between the first portion and the second portion of the coupler.

### Claim 3 (depends on 2)

The humeral head system of claim 2, wherein the coupler comprises a plate extending transverse to the second portion, the offset window comprising a slot formed in the plate configured to uncover indicia indicative of an extent of eccentricity of the articular body to the other member of the joint prosthesis.

### Claim 4 (depends on 3)

The humeral head system of claim 3, further comprising a humeral anchor comprising the other component of the joint prosthesis, the humeral anchor comprising indicia of eccentricity, the slot uncovering different indicia in different rotational positions of the coupler to the humeral anchor, wherein the rotational positions are changed by rotation about a longitudinal axis extending through the second portion of the coupler.

### Claim 5 (depends on 1)

The humeral head system of claim 1, wherein the coupler comprises a threaded channel extending from a first end surface of the coupler to a second end surface of the coupler, the channel providing access to a surface of one or both of the articular body and the other member of the joint prosthesis.

### Claim 6 (depends on 5)

The humeral head system of claim 5, wherein the threaded channel is formed through the first and second portions of the coupler.

### Claim 7 (depends on 1)

The humeral head system of claim 1, wherein the coupler comprises a prying ledge comprising an angled surface disposed between the first portion and the second portion, the prying ledge responsive to a radial load being applied thereto to direct a longitudinal force along the longitudinal axis of the first portion or the second portion of the coupler.

### Claim 8 (depends on 7)

The humeral head system of claim 7, wherein the prying ledge extends radially between a disc member of the coupler and a periphery of the coupler, the prying ledge being accessible from a periphery of the humeral head system when the humeral head system is fully assembled.

### Claim 9 (depends on 1)

The humeral head system of claim 1, wherein the articular body comprises a recess comprising the coupling portion.

### Claim 10 (depends on 9)

The humeral head system of claim 9, wherein the recess comprise a central axis that is offset from a central axis of the convex articular surface of the articular body.

### Claim 11 (depends on 9)

The humeral head system of claim 9, wherein the recess comprises a tapered profile.

### Claim 12 (depends on 9)

The humeral head system of claim 9, the first portion of the coupler comprises a projection configured to be mated with the recess.

### Claim 13 (depends on 12)

The humeral head system of claim 12, wherein the projection is an axial projection and further comprising a radial protrusion, the at least one discrete position site comprises a radial notch and the radial protrusion is configured to mate with the radial notch to define an amount of eccentricity adjustment.

### Claim 14 (depends on 13)

The humeral head system of claim 13, wherein the coupling portion of the articular body comprises the radial notch.

### Claim 15 (depends on 1)

The humeral head system of claim 1, wherein the coupler comprises a disc member having a first surface configured to mate with a recessed portion of the other member of a joint prosthesis and a second surface opposite the first surface configured to be disposed at or adjacent to an exposed surface of the other member.

### Claim 16 (depends on 1)

The humeral head system of claim 1, further comprising at least one discrete position site disposed between the coupler and the convex articular surface, the discrete position site providing a fixed rotational position between the articular body and the coupler.

### Claim 17 (depends on 16)

The humeral head system of claim 16, wherein the at least one discrete position site comprises a single radial notch for connection between the connector and the articular body.

### Claim 18 (depends on 1)

The humeral head system of claim 1, wherein the side of the articular body opposite the convex articular surface comprises indicia indicating orientation.

### Claim 19 (depends on 1)

The humeral head system of claim 1, wherein the coupler comprises an annular projection disposed away from a surface of the coupler configured to face the side of the articular body opposite the convex articular surface, the annular projection being configured to engage a radial notch of the coupling portion at a single rotational orientation.

### Claim 20 (depends on 1)

The humeral head system of claim 1, wherein the first portion of the coupler comprises a tapered protrusion that couples with the articular body by an interference fit.

### Claim 21 (depends on 1)

The humeral head system of claim 1, wherein the second portion is tapered.

### Claim 22 (depends on 1)

The humeral head system of claim 1, wherein the second portion comprises an expandable disc configured to engage an inner periphery of a recess of a bone anchor.

### Claim 23 (depends on 1)

A kit comprising:
the humeral head system of claim 1, wherein the coupler comprises a first coupler having a first offset between the first coupling portion and the second coupling portion; and
a second coupler comprising a second offset between or no offset between a first coupling portion of the second coupler and a second coupling portion of the second coupler, the second offset being different from the first offset.

### Claim at position 24

-41. (canceled)