# US 10,085,839 B2 · Patient-specific and patient-engineered orthopedic implants

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- Number: US 10,085,839 B2
- Document ID: US10085839B2
- Status: Granted
- Kind: B2
- Application number: 12/965,493
- Filed: 2010-12-10
- Published: 2011-06-16
- Granted: 2018-10-02
- Earliest claimed: 2009-12-11
- Assignees: ConforMIS, Inc.
- Applicants: Terrance Wong; John Slamin; Philipp Lang
- Inventors: Terrance Wong; John Slamin; Philipp Lang
- Web page: https://patentgrep.com/patent/US10085839B2

## CPC

- A61F 2/30942: {for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques}
- A61F 2/38: for elbows or knees
- A61F 2/4657: {Measuring instruments used for implanting artificial joints (for surgical instruments A61B90/06)}
- A61F 2/30756: {Cartilage endoprostheses (A61F2/3603 takes precedence)}
- A61F 2/30767: {Special external or bone-contacting surface, e.g. coating for improving bone ingrowth}
- A61F 2/3872: {Meniscus for implantation between the natural bone surfaces}
- A61F 2/3877: {Patellae or trochleae}
- A61F 2002/30011: {differing in porosity}
- A61F 2002/30062: {(bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive}
- A61F 2002/30092: {using shape memory or superelastic materials, e.g. nitinol}
- A61F 2002/30179: {X-shaped}
- A61F 2002/30604: {modular}
- A61F 2002/30616: {Sets comprising a plurality of prosthetic parts of different sizes or orientations}
- A61F 2002/30892: {parallel}
- A61F 2002/30894: {inclined obliquely with respect to each other}
- A61F 2002/30929: {having at least two superposed coatings}
- A61F 2002/30948: {using computerized tomography, i.e. CT scans}
- A61F 2002/3895: {unicompartimental}
- A61F 2210/0004: bioabsorbable
- A61F 2210/0014: using shape memory or superelastic materials, e.g. nitinol
- A61F 2230/0028: Shapes in the form of latin or greek characters
- A61F 2250/0023: differing in porosity
- 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 2310/00047: Aluminium or Al-based alloys
- A61F 2310/00065: Manganese or Mn-based alloys
- A61F 2310/00071: Nickel or Ni-based alloys
- A61F 2310/00077: Copper or Cu-based alloys
- A61F 2310/00083: Zinc or Zn-based alloys
- A61F 2310/00107: Palladium or Pd-based alloys
- A61F 2310/00113: Silver or Ag-based alloys
- A61F 2310/00119: Tin or Sn-based alloys
- A61F 2310/00131: Tantalum or Ta-based alloys
- A61F 2310/00149: Platinum or Pt-based alloys
- A61F 2310/00155: Gold or Au-based alloys
- A61F 2310/00395: Coating or prosthesis-covering structure made of metals or of alloys
- A61F 2310/00592: Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
- 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

Disclosed herein are methods and devices for repairing a knee joint, including customizable and/or highly selectable implants and/or implant components for each patient to provide optimal fit and function.

## Claims

### Claim 1

A patient-specific bicompartmental knee implant for implantation into a patient's knee joint, the implant comprising:
a body having a condylar portion and a trochlear portion,
wherein the condylar portion has a shape generally resembling a surface of a condyle of the patient's knee joint and the trochlear portion having a shape generally resembling the surface of a trochlea of the patient's knee joint, wherein the trochlear portion includes a patellofemoral (PF) region having a standard coronal curvature selected from a family of standard curvatures and a patient-specific sagittal curvature;
the condylar portion further having an articular surface, wherein at least a portion of the articular surface is configured to have a three-dimensional shape that includes articular shape information of a corresponding portion of the condyle of the patient's knee joint; and
the condylar portion further having a bone-facing surface opposite the articular surface, wherein at least a first portion of the bone-facing surface is planar and at least a second portion of the bone-facing surface substantially matches a corresponding portion of an articular surface of the patient's knee joint.

### Claim 2 (depends on 1)

The implant of claim 1 wherein the planar portion of the bone-facing surface is located on a posterior of the condylar portion.

### Claim 3 (depends on 1)

The implant of claim 1, wherein the condylar portion further comprises a third portion of the bone-facing surface, wherein the third portion is substantially planar.

### Claim 4 (depends on 3)

The implant of claim 3, wherein the first and third portions are disposed at anterior and posterior ends of the implant and the second portion is disposed between the first and third portions.

### Claim 5 (depends on 1)

The implant of claim 1, wherein the trochlear portion further comprises an articular surface wherein at least a portion of the articular surface is configured such that a curve of the at least a portion of the articular surface substantially matches a curve of a corresponding portion of an articular surface of the trochlea of the patient's knee joint.

### Claim 6 (depends on 1)

The implant of claim 1, wherein the trochlear portion further comprises a bone-facing surface opposite the articular surface, wherein at least a portion of the bone-facing surface is planar.

### Claim 7

A patient-specific bicompartmental knee implant for implantation into a patient's knee joint, the implant comprising:
a body having a condylar portion and a trochlear portion,
wherein the condylar portion has a shape generally resembling a surface of a condyle of the patient's knee joint and the trochlear portion having a shape generally resembling the surface of a trochlea of the patient's knee joint, wherein the trochlear portion includes a patellofemoral (PF) region having a standard coronal curvature selected from a family of standard curvatures and a patient-specific sagittal curvature;
the condylar portion further having an articular surface wherein at least a portion of the articular surface is configured to have a three-dimensional shape that includes articular shape information of a corresponding portion of the condyle of the patient's knee joint; and the trochlear portion having a bone-facing surface and an articular surface, wherein the bone-facing surface is generally opposite the articular surface and wherein at least a portion of the bone-facing surface is planar.

### Claim 8 (depends on 7)

The implant of claim 7, wherein the condylar portion further comprises a bone-facing surface opposite the articular surface, wherein at least a portion of the bone-facing surface is planar.

### Claim 9 (depends on 7)

The implant of claim 7, wherein the condylar portion further comprises a bone-facing surface opposite the articular surface, wherein at least a portion of the bone-facing surface substantially matches a corresponding portion of an articular surface of the patient's knee joint.

### Claim 10 (depends on 7)

The implant of claim 7, wherein the condylar portion further comprises a bone-facing surface opposite the articular surface, wherein at least a portion of the bone-facing surface is planar and at least a second portion of the bone-facing surface substantially matches a corresponding portion of an articular surface of the patient's knee joint.

### Claim 11 (depends on 10)

The implant of claim 10, wherein the planar portion of the bone-facing surface is located on a posterior of the condylar portion.

### Claim 12 (depends on 7)

The implant of claim 7, wherein the condylar portion further comprises a bone-facing surface opposite the articular surface, wherein at least a first portion of the bone-facing surface is substantially planar, at least a second portion of the bone-facing surface substantially matches a corresponding portion of an articular surface of the patient's knee joint, and at least a third portion of the bone-facing surface is substantially planar.

### Claim 13 (depends on 12)

The implant of claim 12, wherein the first and third portions are disposed at anterior and posterior ends of the implant and the second portion is disposed between the first and third portions.

### Claim 14 (depends on 7)

The implant of claim 7, wherein at least a portion of the articular surface of the trochlear portion is configured such that a curve of the at least a portion of the articular surface substantially matches a curve of a corresponding portion of an articular surface of a trochlea of the patient's knee joint.