# US 5,702,483 A · Debris isolating prosthetic hip joint

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,702,483 A
- Document ID: US5702483A
- Status: Granted
- Kind: A
- Application number: 08/559,480
- Filed: 1995-11-15
- Granted: 1997-12-30
- Earliest claimed: 1994-10-06
- Inventors: Louis M. Kwong
- Web page: https://patentgrep.com/patent/US5702483A

## CPC

- A61F 2/32: for the hip
- A61F 2/30742: {Bellows or hose-like seals; Sealing membranes (A61B17/8808 takes precedence; sealing membranes for retaining bone substitute A61F2/2846)}
- A61F 2/30767: {Special external or bone-contacting surface, e.g. coating for improving bone ingrowth}
- A61F 2/30771: {applied in original prostheses, e.g. holes or grooves}
- A61F 2/30907: {Nets or sleeves applied to surface of prostheses or in cement}
- A61F 2/34: Acetabular cups
- A61F 2/36: Femoral heads {; Femoral endoprostheses}
- A61F 2/3662: {Femoral shafts}
- A61F 2/367: {Proximal or metaphyseal parts of shafts (trochanteric devices connected to said proximal parts A61F2/30739)}
- A61F 2002/0086: {for preferentially controlling or promoting the growth of specific types of cells or tissues}
- A61F 2002/30115: {circular-O-shaped}
- A61F 2002/30378: {Spherically-shaped protrusion and recess}
- A61F 2002/30682: {Means for preventing migration of particles released by the joint, e.g. wear debris or cement particles}
- A61F 2002/30733: {Inserts placed into an endoprosthetic cavity, e.g. for modifying a material property}
- A61F 2002/3082: {Grooves}
- A61F 2002/30822: {Circumferential grooves}
- A61F 2002/30838: {Microstructures}
- A61F 2002/30909: {Nets}
- A61F 2002/30929: {having at least two superposed coatings}
- A61F 2002/3093: {for promoting ingrowth of bone tissue}
- A61F 2002/30968: {Sintering}
- A61F 2002/3241: {having a ring, e.g. for locking the femoral head into the acetabular cup}
- A61F 2002/3611: {Heads or epiphyseal parts of femur}
- A61F 2002/3625: {Necks}
- A61F 2002/3631: {with an integral complete or partial peripheral collar or bearing shoulder at its base}
- A61F 2002/365: {Connections of heads to necks}
- A61F 2002/4631: {the prosthesis being specially adapted for being cemented}
- A61F 2220/0033: made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
- A61F 2230/0006: circular
- 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 2310/00592: Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
- A61F 2310/00796: Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
- 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 prosthetic hip assembly comprising an acetabular component having a bearing surface which forms a first articulating surface and a femoral component including a spherically shaped head defining a second articulating surface. The acetabular component includes a first surface treatment for promoting the attachment of fibrous tissue to the acetabular component. The femoral component includes a second surface treatment for promoting the attachment of fibrous tissue to the femoral component. The first and second surface treatments cause fibrous tissue to attach to the femoral component and the acetabular component to form a capsule between the components when the components are implanted in a patient. Any wear debris created by the first and second articulating surfaces rubbing against one another is confined within the capsule to substantially prevent the migration of the wear debris into interfaces between the components and their associated bones. The capsule further operates to substantially prevent metal and cement debris, remaining at the interfaces between the components and their associated bones, from migrating into the fibrous tissue enclosure and toward the articulating surfaces of the components.

## Claims

### Claim 1

In a prosthetic hip assembly of the type including an acetabular component comprising a generally hemispherical exterior surface and a generally hemispherical interior surface, said interior surface defining a first articulating surface, and a continuous annular rim surface extending radially from said interior surface to said exterior surface, and a femoral component comprising an elongated stem, a neck extending from said stem, and a spherically shaped head coupled to a free end of said neck, said head defining a second articulating surface, the improvement therewith comprising:
first surface treatment means forming a portion of said continuous annular rim surface for promoting the attachment of a fibrous tissue to said acetabular component, said first surface treatment means extending entirely along said continuous annular rim surface; and
second surface treatment means for promoting the attachment of the fibrous tissue to said femoral component, said surface treatment means forming a continuous annular portion of a surface of said femoral component which is located adjacent to said neck, wherein said surface having said second surface treatment means faces substantially toward said spherically shaped head and said first surface treatment means being in opposing relationship with said second surface treatment means when said components are implanted into selected bones of a patient, wherein the fibrous tissue attaching to said first and second means forms a sealed capsule between said components, whereby said sealed capsule substantially prevents wear debris, created within said capsule by said first and second articulating surfaces rubbing against one another, from migrating out of said sealed capsule into interfaces between said components and said selected bones and substantially prevents metal and cement debris, remaining at the interfaces between said components and said selected bones after said implantation from migrating into said sealed capsule and toward said first and second articulating surfaces.

### Claim 2 (depends on 1)

The prosthetic hip assembly according to claim 1, wherein at least one of said first and second surface treatment means comprises a bio-active coating.

### Claim 3 (depends on 1)

The prosthetic hip assembly according to claim 1, wherein at least one of said first and second means comprises a porous structure.

### Claim 4 (depends on 3)

The prosthetic hip assembly according to claim 3, wherein said porous structure comprises at least one layer of beads made from a bio-compatible material.

### Claim 5 (depends on 3)

The prosthetic hip assembly according to claim 3, wherein said porous structure comprises a plurality of pores formed in at least one of said surfaces of said femoral component and said annular rim surface of said acetabular component.

### Claim 6 (depends on 3)

The prosthetic hip assembly according to claim 3, wherein said porous structure includes pores which range in diameter from between 25 and 500 microns.

### Claim 7

A prosthetic acetabular cup comprising:
an acetabular component having a generally hemispherical exterior surface, a generally hemispherical interior surface, and a continuous annular rim surface extending radially from said interior surface to said exterior surface; and
surface treatment means forming a portion of said continuous annular rim surface for promoting the attachment of fibrous tissue thereto, said surface treatment means extending entirely along said continuous annular rim surface.

### Claim 8 (depends on 7)

The prosthetic acetabular cup according to claim 7, wherein said surface treatment means comprises a porous structure.

### Claim 9 (depends on 8)

The prosthetic acetabular cup according to claim 8, wherein said porous surface comprises at least one layer of beads disposed on said annular rim surface.

### Claim 10 (depends on 8)

The prosthetic acetabular cup according to claim 8, wherein said porous surface comprises a plurality of pores formed in said annular rim surface.

### Claim 11 (depends on 8)

The prosthetic acetabular cup according to claim 8, wherein said porous structure includes pores which range in diameter from between 25 and 500 microns.

### Claim 12 (depends on 7)

The prosthetic acetabular cup according to claim 7, wherein said surface treatment means comprises a bio-active coating.

### Claim 13

A femoral prosthetic device comprising:
an elongated stem;
a neck extending from said stem;
a spherically shaped head coupled to a free end of said neck; and
surface treatment means for promoting the ingrowth of fibrous tissue, said surface treatment means forming a continuous annular portion of a surface which is located adjacent to said neck, wherein said surface and said surface treatment means faces substantially toward said spherically shaped head.

### Claim 14 (depends on 13)

The femoral prosthetic device according to claim 13, wherein said surface treatment means comprises a porous structure.

### Claim 15 (depends on 14)

The femoral prosthetic device according to claim 14, wherein said porous structure is at least one layer of bio-compatible beads disposed on said surface located adjacent to said neck.

### Claim 16 (depends on 14)

The femoral prosthetic device according to claim 14, wherein said porous structure comprises a plurality of pores formed in said surface located adjacent to said neck.

### Claim 17 (depends on 14)

The femoral prosthetic device according to claim 14, wherein said porous structure includes a plurality of pores which range in diameter from between 25 and 500 microns.

### Claim 18 (depends on 14)

The femoral prosthetic device according to claim 14, wherein said surface treatment means comprises a bio-active coating.