# US 2018/0256342 A1 · Ceramic multi-hooded enarthrodial joint implant

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- Number: US 2018/0256342 A1
- Document ID: US20180256342A1
- Status: Published application
- Kind: A1
- Application number: 15/932,520
- Filed: 2018-03-10
- Published: 2018-09-13
- Earliest claimed: 2017-03-13
- Inventors: Floyd G. Goodman
- Web page: https://patentgrep.com/patent/US20180256342A1

## CPC

- A61F 2/32: for the hip
- A61F 2/34: Acetabular cups
- A61F 2/3601: {for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices (non-prosthetic internal fixation devices for the femoral head or neck A61B17/74)}
- A61F 2/4081: {Glenoid components, e.g. cups}
- A61F 2002/30448: {using adhesives}
- A61F 2002/30578: {having apertures, e.g. for receiving fixation screws}
- A61F 2002/3233: {having anti-luxation means for preventing complete dislocation of the femoral head from the acetabular cup}
- A61F 2002/3241: {having a ring, e.g. for locking the femoral head into the acetabular cup}
- A61F 2002/3448: {Multiple cups made of three or more concentric shells fitted or nested into one another}
- A61F 2002/349: {Shell having a wavy or undulated peripheral rim}
- A61F 2002/3493: {Spherical shell significantly greater than a hemisphere, e.g. extending over more than 200 degrees}
- A61F 2230/0076: ellipsoidal or ovoid
- A61F 2310/00017: Iron- or Fe-based alloys, e.g. stainless steel
- A61F 2310/00023: Titanium or titanium-based alloys, e.g. Ti-Ni alloys
- A61F 2310/00029: Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
- A61F 2310/00047: Aluminium or Al-based alloys
- A61F 2310/00053: Vanadium or V-based alloys
- A61F 2310/00059: Chromium or Cr-based alloys
- A61F 2310/00101: Molybdenum or Mo-based alloys
- A61F 2310/00179: Ceramics or ceramic-like structures
- A61F 2310/00197: containing magnesia or magnesium oxide
- A61F 2310/00203: containing alumina or aluminium oxide
- A61F 2310/00239: containing zirconia or zirconium oxide ZrO2
- A61F 2310/00317: containing silicon nitride
- 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

Multi-hooded enarthrodial joint implant has a ceramic articulating cup including a ceramic head-receiving cup having an articular surface upon which a head of a joint can articulate, and which, in general, has a margin generally about a hemisphere more or less and at least two hoods that are marginally extended continuations of superior one-half or so of cup containment of a sufficient magnitude to reduce an overall dimension of socket outlet to less than a hemisphere, which can embrace and contain the head. The head is made of ceramic and has a truncated generally circular cross section, a truncated surface with a feature for attachment of the stem, and an opposing articular surface for articulation against the articular surface of the ceramic head-receiving cup. As an ensemble, the cup is combined with the head, typically with a stem, for a total joint implant.

## Claims

### Claim 1

A ceramic multi-hooded articular cup for an enarthrodial joint implant, which comprises a head-receiving cup made of ceramic, which has an articular surface upon which a head of a joint can articulate, and which, in general, has a margin generally about a hemisphere more or less and at least two hoods that are marginally extended continuations of superior one-half or so of cup containment of a sufficient magnitude to reduce an overall dimension of socket outlet to less than a hemisphere, which can embrace and contain the head.

### Claim 2 (depends on 1)

The cup of claim 1, wherein there are only two hoods, which oppose one another, and the enarthrodial joint is a hip joint.

### Claim 3 (depends on 1)

The cup of claim 1, wherein the ceramic is MgO-TTZ.

### Claim 4 (depends on 2)

The cup of claim 2, wherein the ceramic is MgO-TTZ.

### Claim 5

A ceramic insert for an enarthrodial joint implant having a ceramic multi-hooded articular cup, which comprises a joint head made of ceramic, which has a head body configured generally in a shape of a truncated sphere; a generally spherical articulation surface on the head body; and a truncation to the head body forming a truncated surface in which resides a blind frustoconical hole for receipt of a trunnion of a stem, wherein:
the truncated surface is at a central truncation distance perpendicular to the truncated surface or an extrapolation thereof, which is greater than the radius of the head; and
the head can be inserted into and retained by the ceramic multi-headed articular cup, wherein the cup is a head-receiving cup made of ceramic, which has an articular surface upon which the articulation surface of the head can articulate, and which, in general, has a margin generally about a hemisphere more or less and at least two hoods that are marginally extended continuations of superior one-half or so of cup containment of a sufficient magnitude to reduce an overall dimension of socket outlet to less than a hemisphere, which can embrace and contain the head when it is inserted into the cup.

### Claim 6 (depends on 5)

The insert of claim 5, wherein the central truncation distance is about from about from 60% to 80% of the head diameter.

### Claim 7 (depends on 6)

The insert of claim 6, wherein the central truncation distance is about from 70% to 75% of the head diameter.

### Claim 8 (depends on 5)

The insert of claim 5, wherein the enarthrodial joint is a hip joint.

### Claim 9 (depends on 6)

The insert of claim 6, wherein the enarthrodial joint is a hip joint.

### Claim 10 (depends on 7)

The insert of claim 7, wherein the enarthrodial joint is a hip joint.

### Claim 11 (depends on 5)

The insert of claim 5, which further comprises the stem having the trunnion, wherein the stem includes an elongate member for insertion into bone; and the trunnion has a frustoconical male surface inserted into, registering with, and secured by the frustoconical blind hole of the head.

### Claim 12

An enarthrodial joint implant comprising a ceramic multi-hooded articular cup and an insert having a ceramic head with an articulation surface therefor, wherein:
the cup includes a head-receiving cup made of ceramic, which has an articular surface upon which the articulation surface of the head can articulate, and which, in general, has a margin generally about a hemisphere more or less and at least two hoods that are marginally extended continuations of superior one-half or so of cup containment of a sufficient magnitude to reduce an overall dimension of socket outlet to less than a hemisphere, which can embrace and contain the head when it is inserted into the cup;
the insert includes a joint head made of ceramic, which has a head body configured generally in a shape of a truncated sphere; a generally spherical articulation surface on the head body; and a truncation to the head body forming a truncated surface in which resides a blind hole for receipt of a trunnion of a stem, wherein:
the truncated surface is at a central truncation distance perpendicular to the truncated surface or an extrapolation thereof, which is greater than the radius of the head; and
the head can be inserted into and retained by the ceramic multi-headed articular cup when the head is inserted into the cup.

### Claim 13 (depends on 12)

The implant of claim 12, which further comprises the stem having the trunnion, wherein the stem includes an elongate member for insertion into bone; and the trunnion has a male surface inserted into, registering with, and secured by the blind hole of the head.

### Claim 14 (depends on 12)

The implant of claim 12, wherein the cup has two and only two hoods, which oppose one another; the blind hole of the insert is a frustoconical blind hole; the male surface of the trunnion is a frustoconical male surface; and the enarthrodial joint is a hip joint.

### Claim 15 (depends on 13)

The implant of claim 13, wherein the cup has two and only two hoods, which oppose one another; the blind hole of the insert is a frustoconical blind hole; the male surface of the trunnion is a frustoconical male surface; and the enarthrodial joint is a hip joint.

### Claim 16 (depends on 12)

The implant of claim 12, wherein the central truncation distance of the head is about from about from 60% to 85% of the head diameter.

### Claim 17 (depends on 13)

The implant of claim 13, wherein the central truncation distance of the head is about from about from 60% to 85% of the head diameter.

### Claim 18 (depends on 14)

The implant of claim 14, wherein the central truncation distance of the head is about from about from 60% to 85% of the head diameter.

### Claim 19 (depends on 15)

The implant of claim 15, wherein the central truncation distance of the head is about from about from 60% to 85% of the head diameter.

### Claim 20 (depends on 19)

The implant of claim 19, wherein at least one of the following features (A-G) is present:
(A) the frustoconical blind hole of the head has a Morse taper, and the frustoconical male surface of the trunnion has a Morse taper;
(B) the ceramic is MgO-TTZ;
(C) a securing member that secures the hoods and provides for resistance against any likelihood of cracking, fracture, or other failure of the ceramic;
(D) a circumferential outwardly facing groove around the cup into which a circumferential ring is positioned;
(E) an outer backing shell for the cup;
(F) a bone-interfacing coating;
(G) a non-magnetic cobalt-chromium-molybdenum alloy as a wrought powder metallurgy product employed to make the stem.