ORTHOPAEDIC IMPLANTS AND METHODS OF FORMING IMPLANT STRUCTURES

• US 20120191200A1
• Filed: 01/25/2012
• Published: 07/26/2012
• Est. Priority Date: 01/26/2011
• Status: Active Grant

• Current Assignee: John A. Choren
• Original Assignee: John A. Choren
• Inventors: CHOREN, JOHN A.
• Granted Patent: US 9,034,048 B2
• Time in Patent Office: Days
• US Class Current: 623/18.11
• CPC Class Codes: A61F 2/3094 Designing or manufacturing processes
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/3662 Femoral shafts
• CPC Class Codes: A61F 2002/30733 Inserts placed into an endoprosthetic cavity, e.g. for modifying a material property
• CPC Class Codes: A61F 2002/3092 having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/30968 Sintering
• CPC Class Codes: A61F 2002/3097 using laser
• CPC Class Codes: Y10T 29/49 Method of mechanical manufacture

Abstract

Additive processes and novel implant designs provide precise pore design and positioning for clinically useful microstructures exhibiting the appropriate rigidity for orthopaedic implants.

Claims

1. A method of forming an implant in a body, the method comprising forming an implant with a material containing embedded pores arranged selected from the group consisting of a simple cubic arrangement, a hexagonal prismatic arrangement, a face-centered cubic arrangement, a hexagonal close-packed arrangement and a body-centered cubic arrangement.

2. An implant formed by the method of claim 1.

3. A method according to claim 1, wherein said implant is rod shaped.

4. A method according to claim 1, wherein said implant is plate shaped.

5. A method according to claim 4, wherein said plate is flat.

6. A method according to claim 4, wherein said plate is curved.

7. A method according to claim 1, said pores having a pore radius between 100 μ

m to 2000 μ

m.

8. A method according to claim 1, said material comprising a metallic material.

9. A method according to claim 1, said method further comprising varying a bending stiffness or a flexural rigidity of said implant by varying at least one of a pore radius, a minimum center-to-center distance between adjacent pores, and an orientation of the specific arrangement of pores relative to an applied load.

10. A method according to claim 9, said implant optimized to achieve a beneficial clinical result.

11. A method according to claim 1, wherein said pores are spherical.

12. A method of altering a bending stiffness or a flexural rigidity of an orthopaedic implant, the method comprising providing an orthopaedic implant with interior porosity selected from the group consisting of simple cubic arrangement, hexagonal prismatic arrangement, face-centered cubic arrangement, hexagonal close-packed arrangement and body-centered cubic arrangement.

13. A method according to claim 12, whereby a peri-prosthetic bone resorption is reduced.