# US 5,702,485 A · Collared prosthetic device with centering fins

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

- Number: US 5,702,485 A
- Document ID: US5702485A
- Status: Granted
- Kind: A
- Application number: 08/601,339
- Filed: 1996-02-16
- Granted: 1997-12-30
- Earliest claimed: 1992-11-20
- Inventors: Dennis W. Burke; G. Kris Kumar; Steven C. Kitch
- Web page: https://patentgrep.com/patent/US5702485A

## CPC

- A61B 17/8802: {Equipment for handling bone cement or other fluid fillers}
- A61B 17/1604: {Chisels; Rongeurs; Punches; Stamps}
- A61B 17/1659: {Surgical rasps, files, planes, or scrapers}
- A61B 17/175: {for preparing the femur for hip prosthesis insertion}
- A61F 2/3609: {Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts (A61F2/3601 takes precedence)}
- A61F 2/30728: {Collars; Bone edge protectors (A61F2/30734 takes precedence; sealing collars for use during cementing A61B17/8808)}
- A61F 2/30734: {Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect}
- A61F 2/30771: {applied in original prostheses, e.g. holes or grooves}
- A61F 2/36: Femoral heads {; Femoral endoprostheses}
- A61F 2/367: {Proximal or metaphyseal parts of shafts (trochanteric devices connected to said proximal parts A61F2/30739)}
- A61F 2002/30131: {horseshoe- or crescent- or C-shaped or U-shaped}
- A61F 2002/30153: {rectangular}
- A61F 2002/30169: {Pi-shaped}
- A61F 2002/30179: {X-shaped}
- A61F 2002/30331: {made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit}
- A61F 2002/30332: {Conically- or frustoconically-shaped protrusion and recess}
- A61F 2002/30448: {using adhesives}
- A61F 2002/30451: {soldered or brazed or welded}
- A61F 2002/305: {Snap connection}
- A61F 2002/30616: {Sets comprising a plurality of prosthetic parts of different sizes or orientations}
- A61F 2002/30785: {parallel}
- A61F 2002/30808: {parallel}
- A61F 2002/30878: {with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts}
- A61F 2002/30879: {Ribs}
- A61F 2002/30884: {Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity}
- 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 2220/0025: 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 2220/0058: soldered or brazed or welded
- A61F 2230/0013: Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
- A61F 2230/0019: rectangular
- A61F 2230/0047: Pi-shaped
- A61F 2230/0058: X-shaped
- 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 2310/00353: Bone cement, e.g. polymethylmethacrylate or PMMA
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- 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 device for the human hip having elongated fins or other like protrusions which are provided on the lower surface of a collar and which extend into previously formed slots or grooves in the bone. Either a plurality of fins, or a single fin having a non-rectilinear shape is provided. In one embodiment, previously formed fins are secured to a lower surface of the collar after formation of the collar. In this embodiment, pegs disposed on the fins preferably reside in correspondingly formed holes in the collar, or reside within slots extending inwardly from outer surfaces of the collar. Alternatively, the fins may be welded or otherwise bonded to the lower surface of the collar.

## Claims

### Claim 1

A femoral component for use in a total hip replacement, said component being adapted to be inserted into a femoral cavity formed in a proximal end of the femur, said component comprising:
an elongated stem adapted to fit into the cavity formed in the proximal end of the femur, said stem having a proximal end and a medial surface;
a collar disposed on said proximal end of said stem and extending at least from the medial surface in a direction generally transverse of a direction of elongation of said stem, said collar having a lower surface adapted to rest in contact with a surface on the proximal end of the femur; and
a structure disposed on said lower surface of said collar, said structure being disposed only beyond said medial surface of said stem and comprising at least two fins disposed at an angle with respect to one another and extending away from said medial surface of said stem, said two fins being interconnected by a web, said fins being structured to extend into a recess formed in the proximal end of the femur.

### Claim 2 (depends on 1)

The femoral component as recited in claim 1, wherein said fins each include a peg and wherein said lower surface of said collar includes holes into which said pegs extend.

### Claim 3 (depends on 1)

The femoral component as recited in claim 1, wherein said lower surface of said collar includes elongated slots and wherein each fin includes a peg which is disposed within an associated slot.

### Claim 4 (depends on 3)

The femoral component as recited in claim 3, wherein said slots extend from outer edges of said collar inwardly and wherein each slot has an opening disposed on outer edges of said collar.

### Claim 5 (depends on 4)

The femoral component as recited in claim 4 wherein each peg has a cross-sectional dimension smaller than a width of an associated slot, and wherein said pegs each include at least one axially extending ridge disposed on an outer surface thereof.

### Claim 6 (depends on 3)

The femoral component as recited in claim 3 wherein said fins are formed of a resilient material which urges said pegs in said slots toward one another and away from outer edges of said collar.

### Claim 7 (depends on 1)

The femoral component as recited in claim 1 wherein said web includes a peg which extends into a correspondingly formed hole in said medial surface of said stem.

### Claim 8 (depends on 1)

The femoral component as recited in claim 1 wherein each of said pegs comprises a pair of spaced, resilient fingers disposed at a distal end thereof.

### Claim 9

A femoral component for use in a total hip replacement, said component being adapted to be inserted into a femoral cavity formed in a proximal end of the femur, said component comprising:
a stem structured to fit into the cavity formed in the proximal end of the femur, said stem having a proximal end and a medial surface;
a collar disposed on said proximal end of said stem and extending at least from said medial surface of said stem, said collar having a lower surface adapted to rest in contact with a surface on the proximal end of the femur; and
a structure disposed on said lower surface of said collar, said structure comprising:
a first fin having a proximal end and a distal end;
a second fin having a proximal end and a distal end, said first and said second fins forming an angle with respect to one another, said distal end of said first fin and said distal end of said second fin extending away from said medial surface of said stem;
a web interconnecting said proximal end of said first fin with said proximal end of said second fin, said web being disposed in abutting relation with said medial surface of said stem; and
a peg disposed adjacent said distal end of each of said first and said second fins, each of said pegs being disposed in a friction fit with an opening formed on said lower surface of said collar.

### Claim 10 (depends on 9)

The femoral component as recited in claim 9, wherein each said opening is an elongated slot extending from an edge of said collar inwardly toward the other slot, wherein said structure is formed of a resilient material and wherein said pegs ride in said slot and are biased inwardly away from an associated edge of said collar.

### Claim 11 (depends on 10)

The femoral component as recited in claim 10, wherein each peg has a cross-sectional dimension smaller than a width of an associated slot.

### Claim 12 (depends on 9)

The femoral component as recited in claim 9, wherein each peg has a cross-sectional dimension smaller than a width of an associated opening and wherein said pegs each include opposed, axially extending ridges on an outer surface thereof.

### Claim 13 (depends on 9)

The femoral component as recited in claim 9, wherein each peg is larger in a cross-sectional dimension than a cross-sectional dimension of an associated opening into which it is inserted, and wherein each peg includes spaced, flexible fingers disposed on a distal end thereof.

### Claim 14 (depends on 9)

The femoral component as recited in claim 9, wherein said web includes a peg which extends into a correspondingly formed hole in said medial surface of said stem.

### Claim 15

A femoral component for use in a total hip replacement, said component being adapted to be inserted into a femoral cavity formed in a proximal end of the femur, said component comprising:
an elongated stem adapted to fit into the cavity formed in the proximal end of the femur, said stem having a proximal end and a medial surface;
a collar disposed on said proximal end of said stem and extending at least from the medial surface in a direction generally transverse of a direction of elongation of said stem, said collar having a lower surface adapted to rest in contact with a surface on the proximal end of the femur, said lower surface of said collar having elongated slots disposed thereon; and
a structure disposed on said lower surface of said collar, said structure being disposed only beyond said medial surface of said stem and comprising at least two fins disposed at an angle with respect to one another and interconnected by a web, said fins being structured to extend into a recess formed in the proximal end of the femur, each of said fins including a peg which is disposed within an associated slot disposed on said lower surface of said collar, said fins being formed of a resilient material which urges said pegs in said slots toward one another and away from outer edges of said collar.

### Claim 16

A femoral component for use in a total hip replacement, said component being adapted to be inserted into a femoral cavity formed in a proximal end of the femur, said component comprising:
a stem structured to fit into the cavity formed in the proximal end of the femur, said stem having a proximal end and a medial surface;
a collar disposed on said proximal end of said stem and extending at least from said medial surface of said stem, said collar having a lower surface adapted to rest in contact with a surface on the proximal end of the femur; and
a structure disposed on said lower surface of said collar, said structure being formed of a resilient material and comprising:
a first fin having a proximal end and a distal end;
a second fin having a proximal end and a distal end, said first and said second fins forming an angle with respect to one another;
a web interconnecting said proximal end of said first fin with said proximal end of said second fin, said web being disposed in abutting relation with said medial surface of said stem; and
a peg disposed adjacent said distal end of each of said first and said second fins, each of said pegs being disposed in a friction fit with an elongated slot formed on said lower surface of said collar and extending from an associated edge of said collar inwardly toward the other one of said slots, each of said pegs riding in one of said slots and being biased inwardly away from its associated edge of said collar.

### Claim 17 (depends on 16)

The femoral component as recited in claim 16, wherein each peg has a cross-sectional dimension smaller than a width of an associated slot.

### Claim 18

A prosthetic component for use in a joint replacement, said prosthetic component being adapted to be inserted into a cavity formed in a proximal end of a bone, said component comprising:
an elongated stem adapted to fit into the cavity formed in the proximal end of the bone, said stem having a proximal end and a medial surface;
a collar disposed on said proximal end of said stem and extending at least from the medial surface in a direction generally transverse of a direction of elongation of said stem, said collar having a lower surface adapted to rest in contact with a surface on the proximal end of the bone; and
a structure disposed on said lower surface of said collar, said structure being disposed only beyond said medial surface of said stem and comprising at least two fins disposed at an angle with respect to one another and extending away from said medial surface of said stem, said fins being interconnected by a web, said fins being structured to extend into a recess formed in the proximal end of the bone.

### Claim 19

A prosthetic component for use in a joint replacement, said component being adapted to be inserted into a cavity formed in a proximal end of a bone, said component comprising:
a stem structured to fit into the cavity formed in the proximal end of the bone, said stem having a proximal end and a medial surface;
a collar disposed on said proximal end of said stem and extending at least from said medial surface of said stem, said collar having a lower surface adapted to rest in contact with a surface on the proximal end of the bone; and
a structure disposed on said lower surface of said collar, said structure comprising:
a first fin having a proximal end and a distal end;
a second fin having a proximal end and a distal end, said first and said second fins forming an angle with respect to one another, said distal end of said first fin and said distal end of said second fin extending away from said medial surface of said stem;
a web interconnecting said proximal end of said first fin with said proximal end of said second fin, said web being disposed in abutting relation with said medial surface of said stem; and
a peg disposed adjacent said distal end of each of said first and said second fins, each of said pegs being disposed in a friction fit with an opening formed on said lower surface of said collar.