Implants for altering wear patterns of articular surfaces

• US 9,700,420 B2
• Filed: 11/09/2015
• Issued: 07/11/2017
• Est. Priority Date: 03/05/2008
• Status: Expired due to Fees

• Current Assignee: Conformis Incorporated
• Original Assignee: Conformis Incorporated
• Inventors: Fitz, Wolfgang, Bojarski, Raymond A., Lang, Philipp
• Primary Examiner(s): Armand, Marc
• Assistant Examiner(s): Yi, Shannon
• Application Number:
  US14/935,965
• Publication Number:
  US 20160256284A1
• Time in Patent Office: 610 Days
• Field of Search: 382128, 623 1412
• CPC Class Codes: A61B 2034/108 Computer aided selection or customisation of medical implants or cutting guides
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61F 2/30756 Cartilage endoprostheses A61F2/3603 takes precedence
• CPC Class Codes: A61F 2/30942 for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
• CPC Class Codes: A61F 2/3603 implanted without ablation of the whole natural femoral head endoprosthetic cartilage A61F2/30756
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/3872 Meniscus for implantation between the natural bone surfaces
• CPC Class Codes: A61F 2/3877 Patellae or trochleae
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2/4081 Glenoid components, e.g. cups
• CPC Class Codes: A61F 2/488 Means for detecting or monitoring wear
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/30065 thermoplastic, i.e. softening or fusing when heated, and hardening and becoming rigid again when cooled
• CPC Class Codes: A61F 2002/30324 differing in thickness
• CPC Class Codes: A61F 2002/30757 made of a sheet covering the natural articular surface, e.g. cap
• CPC Class Codes: A61F 2002/30761 Support means for artificial cartilage, e.g. cartilage defect covering membranes
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30879 Ribs
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/30891 : Plurality of protrusions
• CPC Class Codes: A61F 2002/30894 : inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3093 : for promoting ingrowth of bone tissue
• CPC Class Codes: A61F 2002/30934 : Special articulating surfaces
• CPC Class Codes: A61F 2002/30939 : Means for modifying the geometry of articulating surfaces, e.g. for compensating excessive clearance caused by wear
• CPC Class Codes: A61F 2002/30943 : using mathematical models
• CPC Class Codes: A61F 2002/30948 : using computerized tomography, i.e. CT scans
• CPC Class Codes: A61F 2002/30952 : using CAD-CAM techniques or NC-techniques
• CPC Class Codes: A61F 2002/30953 : using a remote computer network, e.g. Internet
• CPC Class Codes: A61F 2002/30957 : using a positive or a negative model, e.g. moulds
• CPC Class Codes: A61F 2002/3096 : trimmed or cut to a customised size
• CPC Class Codes: A61F 2002/3895 : unicompartimental
• CPC Class Codes: A61F 2002/4633 : for selection of endoprosthetic joints or for pre-operative planning
• CPC Class Codes: A61F 2210/0004 : bioabsorbable
• CPC Class Codes: A61F 2210/0071 : thermoplastic
• CPC Class Codes: A61F 2310/00011 : Metals or alloys
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00047 : Aluminium or Al-based alloys
• CPC Class Codes: A61F 2310/00065 : Manganese or Mn-based alloys
• CPC Class Codes: A61F 2310/00071 : Nickel or Ni-based alloys
• CPC Class Codes: A61F 2310/00077 : Copper or Cu-based alloys
• CPC Class Codes: A61F 2310/00083 : Zinc or Zn-based alloys
• CPC Class Codes: A61F 2310/00107 : Palladium or Pd-based alloys
• CPC Class Codes: A61F 2310/00113 : Silver or Ag-based alloys
• CPC Class Codes: A61F 2310/00119 : Tin or Sn-based alloys
• CPC Class Codes: A61F 2310/00131 : Tantalum or Ta-based alloys
• CPC Class Codes: A61F 2310/00149 : Platinum or Pt-based alloys
• CPC Class Codes: A61F 2310/00155 : Gold or Au-based alloys
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00365 : Proteins; Polypeptides; Degradation products thereof
• CPC Class Codes: B33Y 70/00 : Materials specially adapted for additive manufacturing
• CPC Class Codes: B33Y 70/10 : Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
• CPC Class Codes: B33Y 80/00 : Products made by additive manufacturing

Abstract

Methods and devices for correcting wear pattern defects in joints. The methods and devices described herein allow for the restoration of correcting abnormal biomechanical loading conditions in a joint brought on by wear pattern defects, and also can, in embodiments, permit correction of proper kinematic movement.

Claims

1. An implant for correcting a wear pattern of an articular surface a joint of patient, comprising:

an implant body having a characteristic topography,

an interior surface, and

an outer surface,

wherein the characteristic topography is derived from a wear pattern of the articular surface and is configured to alter the wear pattern of the articular surface to a revised wear pattern, wherein the interior surface is configured to be placed at least in part on cartilage and/or subchondral bone of the joint.

2. The implant of claim 1, wherein the revised wear pattern is configured to improve kinematics of the joint.

3. The implant of claim 1, wherein the revised wear pattern is based, at least in part, on existing geometry of the joint of the patient.

4. The implant of claim 1, wherein the revised wear pattern is based, at least in part, on kinematics of the joint of the patient.

5. The implant of claim 1, wherein the revised wear pattern is based, at least in part, on wear patterns of a class of patients.

6. The implant of claim 1, wherein the revised wear pattern is based, at least in part, on kinematics of a class of patients.

7. An implant for correcting a wear pattern of an articular surface a knee joint of a patient, comprising:

an implant body having a characteristic topography,

an interior surface, and

an outer surface,

wherein the characteristic topography is derived from a wear pattern of the articular surface and is configured to alter the wear pattern of the articular surface to a revised wear pattern, wherein the interior surface is configured to be placed at least in part on cartilage and/or subchondral bone of the knee joint.

8. The implant of claim 7, wherein the revised wear pattern is configured to improve kinematics of the knee joint.

9. The implant of claim 7, wherein the revised wear pattern is based, at least in part, on existing geometry of the knee joint of the patient.

10. The implant of claim 7, wherein the revised wear pattern is based, at least in part, on kinematics of the knee joint of the patient.

11. The implant of claim 7, wherein the revised wear pattern is based, at least in part, on wear patterns of a class of patients.

12. The implant of claim 7, wherein the revised wear pattern is based, at least in part, on kinematics of a class of patients.