# US 2014/0207245 A1 · Cup with cross-linked polymer layer

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- Number: US 2014/0207245 A1
- Document ID: US20140207245A1
- Status: Published application
- Kind: A1
- Application number: 14/169,745
- Filed: 2014-01-31
- Published: 2014-07-24
- Earliest claimed: 2009-12-21
- Inventors: Derek James Wallace McMinn
- Web page: https://patentgrep.com/patent/US20140207245A1

## CPC

- A61F 2/34: Acetabular cups
- A61F 2/30771: {applied in original prostheses, e.g. holes or grooves}
- A61F 2/4609: {of acetabular cups}
- A61L 27/14: Macromolecular materials
- A61L 27/50: Materials characterised by their function or physical properties {, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials}
- A61L 27/505: {Stabilizers}
- B29C 43/003: {characterised by the choice of material}
- B29C 43/146: {for making multilayered articles}
- B32B 1/00: Layered products having a non-planar shape
- B32B 3/00: Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/08: of synthetic resin
- C08J 3/00: Processes of treating or compounding macromolecular substances
- C08J 3/24: Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K)
- C08J 3/28: Treatment by wave energy or particle radiation
- C08K 5/1545: Six-membered rings
- A61F 2/3094: {Designing or manufacturing processes}
- A61F 2/38: for elbows or knees
- A61F 2002/30026: {differing in wear resistance}
- A61F 2002/30112: {Rounded shapes, e.g. with rounded corners}
- A61F 2002/30143: {hexagonal}
- A61F 2002/30205: {conical}
- A61F 2002/30207: {Double convex cones, i.e. element having two convex cones, one at each of its opposite ends}
- A61F 2002/30324: {differing in thickness}
- A61F 2002/30331: {made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit}
- A61F 2002/30352: {Protrusion and recess of D-shaped cross-section}
- A61F 2002/30378: {Spherically-shaped protrusion and recess}
- A61F 2002/30448: {using adhesives}
- A61F 2002/30462: {retained or tied with a rope, string, thread, wire or cable}
- A61F 2002/3052: {unrestrained in only one direction, e.g. moving unidirectionally}
- A61F 2002/30561: {breakable or frangible}
- A61F 2002/30685: {Means for reducing or preventing the generation of wear particulates}
- A61F 2002/30841: {Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes}
- A61F 2002/30878: {with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts}
- A61F 2002/30889: {Arcuate pegs}
- A61F 2002/30904: {serrated profile, i.e. saw-toothed}
- A61F 2002/30971: {Laminates, i.e. layered products}
- A61F 2002/344: {the inner shell having an inner hip femoral head-receiving cavity offset from its centre line}
- A61F 2002/4681: {by applying mechanical shocks, e.g. by hammering}
- A61F 2220/0025: Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F 2220/0033: made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
- A61F 2220/005: using adhesives
- A61F 2220/0075: sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
- A61F 2230/0004: Rounded shapes, e.g. with rounded corners
- A61F 2230/0017: Angular shapes
- B29C 2043/147: {by compressing after the laying of further material}
- B29C 2043/148: {using different moulds}
- B29K 2023/06: {PE, i.e. polyethylene}
- B29K 2105/0044: {Stabilisers, e.g. against oxydation, light or heat}
- B29L 2031/7532: {Artificial members, protheses}
- B32B 2535/00: Medical equipment, e.g. bandage, prostheses or catheter
- B33Y 80/00: Products made by additive manufacturing
- C08J 2300/00: Characterised by the use of unspecified polymers
- C08J 2323/06: Polyethene
- C08K 2201/012: Additives improving oxygen scavenging properties
- 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)
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING

## Abstract

This invention relates to a method of forming a polymer component and comprises blending polymer particles with antioxidant to form a mixture in which the antioxidant coats the polymer particles, irradiating the polymer particles to cross-link the polymer particles therein and forming the irradiated mixture into a consolidated component. The invention also relates to a method of forming an articular surface for a prosthesis and a prosthesis having a polymer articular bearing surface wherein at least one pre-determined portion of the bearing surface is provided with cross-linked polymer bonds.

## Claims

### Claim 1

An acetabular cup prosthesis comprising an outer surface and an inner surface, wherein the center of the inner surface is displaced with respect to the outer surface so as to allow for an increased cup thickness in a pre-determined wear zone and wherein a cut-out is provided at an inferior edge of the cup to compensate for the displacement of the inner surface.

### Claim 2 (depends on 1)

An acetabular cup prosthesis according to claim 1, wherein the cup is constituted by a single component.

### Claim 3 (depends on 2)

An acetabular cup prosthesis according to claim 2, wherein the component is formed from a material selected from metal, ceramic, polymer or a composite thereof.

### Claim 4 (depends on 1)

An acetabular cup prosthesis according to claim 1, wherein the cup is constituted by two or more components.

### Claim 5 (depends on 4)

An acetabular cup prosthesis according to claim 4, the cup comprising an outer shell and an inner liner, the outer surface being provided by the outer shell and the inner surface being provided by the inner liner.

### Claim 6 (depends on 5)

An acetabular cup according to claim 5, wherein the components are formed from a material selected from metal, ceramic, polymer, or a composite thereof.

### Claim 7 (depends on 5)

An acetabular cup according to claim 5, comprises a metal, ceramic, polymer or composite shell and at least one metal, ceramic, polymer or composite liner.

### Claim 8 (depends on 5)

An acetabular cup according to claim 5, wherein the outer surface comprises a porous coating.

### Claim 9 (depends on 1)

An acetabular cup according to claim 1, wherein the center of the inner surface (i.e. the center of articulation) is displaced outwardly of the outer surface and/or inferiorly thereof.

### Claim 10 (depends on 1)

An acetabular cup according to claim 1, wherein the inner surface is displaced outwardly by 3.5 mm.

### Claim 11 (depends on 1)

An acetabular cup according to claim 1, wherein the inner surface is displaced outwardly by 0.5-7 mm and inferiorly by 0.5-4 mm.

### Claim 12

An acetabular cup prosthesis comprising a metal outer shell and a polymer inner liner, wherein the center of the polymer inner liner is displaced with respect to the metal outer shell so as to allow for an increased cup thickness in a pre-determined wear zone and wherein a cut-out is provided at an inferior edge of the cup to compensate for the displacement of the inner liner.

### Claim 13 (depends on 12)

An acetabular cup prosthesis according to claim 12, wherein a center of articulation is displaced outwardly of the metal shell and/or inferiorly thereof.

### Claim 14 (depends on 12)

An acetabular cup prosthesis according to claim 12, wherein the inner liner is displaced such that a 1 mm thickness metal shell is provided with polymer liner having a 4 mm thickness in a pre-determined wear zone and a 1 mm thickness at the inferior edge.

### Claim 15 (depends on 12)

An acetabular cup prosthesis according to claim 12, wherein the metal shell is thicker in the region adjacent the pre-determined wear zone than at its inferior edge.

### Claim 16 (depends on 12)

An acetabular cup prosthesis according to claim 12, wherein the metal shell comprises an inwardly extending bulge the region of the pre-determined wear zone.

### Claim 17 (depends on 12)

An acetabular cup prosthesis according to claim 12, wherein the metal shell is thin around the entire periphery of the cup.

### Claim 18 (depends on 12)

An acetabular cup prosthesis according to claim 12, wherein the metal shell includes a beveled edge.

### Claim 19 (depends on 18)

An acetabular cup prosthesis according to claim 18, wherein the beveled edge is inclined inwardly.

### Claim 20 (depends on 12)

An acetabular cup prosthesis according to claim 12, wherein the polymer liner includes a rounded edge.