Artificial bone graft implant

• US 20030120348A1
• Filed: 01/29/2003
• Published: 06/26/2003
• Est. Priority Date: 06/07/1995
• Status: Abandoned Application

• Current Assignee: Julie A. Bearcroft, Laura C. Small, Robert Brosnahan
• Original Assignee: Julie A. Bearcroft, Laura C. Small, Robert Brosnahan
• Inventors: Small, Laura C., Brosnahan, Robert, Bearcroft, Julie A.
• Application Number:
  US10/353,533
• Publication Number:
  US 20030120348A1
• Time in Patent Office: Days
• US Class Current: 623/23.5
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2002/2825 Femur
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30011 differing in porosity
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/30112 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30158 trapezoidal
• CPC Class Codes: A61F 2002/30187 D-shaped or half-disc-shaped
• CPC Class Codes: A61F 2002/30733 Inserts placed into an endoprosthetic cavity, e.g. for modifying a material property
• CPC Class Codes: A61F 2002/30777 Oblong apertures
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30968 Sintering
• CPC Class Codes: A61F 2210/0004 bioabsorbable
• CPC Class Codes: A61F 2230/0004 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2230/0019 : rectangular
• CPC Class Codes: A61F 2230/0026 : trapezoidal
• CPC Class Codes: A61F 2230/0034 : D-shaped
• CPC Class Codes: A61F 2250/0023 : differing in porosity
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00293 : containing a phosphorus-containing compound, e.g. apatite
• CPC Class Codes: A61F 2310/00329 : Glasses, e.g. bioglass

Abstract

An artificial bone graft implant for use as a replacement for living bone material in surgical procedures requiring the use of bone graft material includes a body formed of a microporous material and configured to be implanted into a prepared site in a patient'"'"'s bone tissue. The body has a center portion, an outer portion and a pair of opposed outer surfaces defining the body. The body has a small average pore size in the center portion that gradually changes to larger average pore size in the outer portion. The pore size of the center portion of the implant allows for a load bearing capacity similar to natural bone and the pore size of the outer portion of the implant allows for the ingrowth of bone tissue.

Claims

1. A artificial bone graft implant for use as a replacement for living bone material in surgical procedures requiring the use of bone graft material, the implant comprising:

a body formed of a microporous material and configured to be implanted into a prepared site in a patient'"'"'s bone tissue, said body having a center portion, an outer portion and a pair of opposed outer surfaces defining said body;

said body having a small average pore size in the center portion that gradually changes to larger average pore size in the outer portion, wherein the pore size of the center portion of the implant allows for a load bearing capacity similar to natural bone and the pore size of the outer portion of the implant allows for the ingrowth of bone tissue.

2. The implant of claim 1, wherein the body is comprised of a biocompatible microporous material that bonds to bone.

3. The implant of claim 2, wherein the biocompatible microporous material is selected from the group consisting of polymers, ceramics and composite materials.

4. The implant of claim 3, wherein the composite material comprises calcium phosphate, bioactive glass, and bioresorbable polymers.

5. A bone implant for use as a replacement for living bone material comprising:

a body comprising a bioabsorbable material configured and shaped to be implanted into a prepared site in bone tissue, the body having a center portion, an outer portion and a pair of opposed outer surfaces defining the body;

the body having a relatively low average porosity in the center portion and gradually changing to a relatively high average porosity in the outer portion, wherein the pore size of the center portion provides for a load bearing capacity generally similar to material bone and the pore size of the outer portion permits ingrowth of bone tissue.

6. The implant as claimed in claim 5, wherein the body is monolithically formed of a bioabsorbable material.