# US 10,849,759 B2 · Ceramic multi-hooded enarthrodial joint implant

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- Number: US 10,849,759 B2
- Document ID: US10849759B2
- Status: Granted
- Kind: B2
- Application number: 15/932,520
- Filed: 2018-03-10
- Published: 2018-09-13
- Granted: 2020-12-01
- Earliest claimed: 2017-03-13
- Applicants: Floyd G. Goodman
- Inventors: Floyd G. Goodman
- Web page: https://patentgrep.com/patent/US10849759B2

## 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

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 is adapted and configured to be fixed when implanted into a patient such that the cup is fixed with respect to the patient directly or with respect to a backing shell in which the cup resides when the backing shell is present and fixed directly to the patient, which has an articular surface upon which the articulation surface of the head can articulate, and which has a margin generally about a hemisphere and two and only two generally opposing hoods that are marginally extended continuations of superior about one-half 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 the head 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 extending from a peak of the spherical articulation surface to a center of the truncated surface, wherein the central truncation distance is perpendicular to the truncated surface; and
the head can be inserted into and retained by the ceramic multi-headed articular cup when the head is inserted into the cup; and
there is no securing member present for resistance against any likelihood of cracking, fracture, or other failure of the ceramic by application of outwardy displacing force on the hoods.

### Claim 2 (depends on 1)

The implant of claim 1, 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 3 (depends on 2)

The implant of claim 2, wherein as the at least two generally opposing hoods the cup has two and only two hoods, which oppose one another; the blind hole of the head of the insert is a frustoconical blind hole; the male surface of the trunnion is a frustoconical male surface configured to correspond with the frustoconical blind hole of the head of the insert and provide for a self-locking taper; and the enarthrodial joint is a hip joint.

### Claim 4 (depends on 3)

The implant of claim 3, wherein the central truncation distance of the head is about from about from 60% to 85% of the head diameter.

### Claim 5 (depends on 4)

The implant of claim 4, 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 corresponding Morse taper;
(B) the ceramic is MgO-TTZ;
(C) a circumferential outwardly facing groove around the cup, but not the hoods, into which a circumferential ring is positioned;
(D) an outer backing shell for the cup;
(E) a bone-interfacing coating;
(F) a non-magnetic cobalt-chromium-molybdenum alloy as a wrought powder metallurgy product employed to make the stem; and
(G) the margin and hoods are angled about from five to twenty degrees with respect to a line or plane perpendicular to a central axis of the cup.

### Claim 6 (depends on 4)

The implant of claim 4, wherein the ceramic is MgO-TTZ.

### Claim 7 (depends on 2)

The implant of claim 2, wherein the central truncation distance of the head is about from about from 60% to 85% of the head diameter.

### Claim 8 (depends on 1)

The implant of claim 1, wherein the blind hole of the head of the insert is a frustoconical blind hole; the male surface of the trunnion is a frustoconical male surface configured to correspond with the frustoconical blind hole of the head of the insert and provide for a self-locking taper; and the enarthrodial joint is a hip joint.

### Claim 9 (depends on 8)

The implant of claim 8, wherein the central truncation distance of the head is about from about from 60% to 85% of the head diameter.

### Claim 10 (depends on 1)

The implant of claim 1, wherein the central truncation distance of the head is about from about from 60% to 85% of the head diameter.

### Claim 11

A ceramic joint head for an enarthrodial joint implant having a ceramic double-hooded articular cup, which comprises a head body made of ceramic and 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 extending from a peak of the spherical articulation surface to a center of the truncated surface, wherein the central truncation distance is perpendicular to the truncated surface;
the joint head is configured for insertion into and retention by the ceramic double-hooded articular cup, which is adapted and configured to be fixed when implanted into a patient such that the cup is fixed with respect to the patient directly or with respect to a backing shell in which the cup resides when the backing shell is present and fixed directly to the patient, which has an articular surface upon which the articulation surface of the joint head can articulate, and which has a margin generally about a hemisphere and two and only two generally opposing hoods that are marginally extended continuations of superior about one-half 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 joint head when the joint head is inserted into the cup;
the enarthrodial joint is a hip joint; and
there is no securing member present for resistance against any likelihood of cracking, fracture, or other failure of the ceramic by application of outwardy displacing force on the hoods.

### Claim 12 (depends on 11)

The insert of claim 11, wherein the ceramic is MgO-TTZ; and
the central truncation distance is about from about from 65% to 80% of the head diameter.

### Claim 13 (depends on 12)

The insert of claim 12, wherein the central truncation distance is about from 70% to 75% of the head diameter.

### Claim 14

A ceramic double-hooded articular cup for an enarthrodial joint implant, which comprises a head-receiving cup made of ceramic, which is adapted and configured to be fixed when implanted into a patient such that the cup is fixed with respect to the patient directly or with respect to a backing shell in which the cup resides when the backing shell is present and fixed directly to the patient, which has an articular surface upon which a head of a joint can articulate, and which has a margin generally about a hemisphere and two and only two generally opposing hoods that are marginally extended continuations of superior about one-half 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 the head is inserted into the cup, wherein:
the enarthrodial joint is a hip joint; and
there is no securing member present for resistance against any likelihood of cracking, fracture, or other failure of the ceramic by application of outwardly displacing force on the hoods.

### Claim 15 (depends on 14)

The cup of claim 14, wherein the ceramic is MgO-TTZ.