Christopher C Carson

US Patent:

6428577, Aug 6, 2002

Filed:

Sep 26, 2000

Appl. No.:

09/670186

Inventors:

David Lee Evans - Bartlett TN
Michael Ries - Nicasio CA
Greg Marik - Germantown TN
Robert Brosnahan - Germantown TN
Christopher Patrick Carson - Memphis TN
Albert J. Pothier - Memphis TN

Assignee:

Smith Nephew, Inc. - Memphis TN

International Classification:

A61F 238

US Classification:

623 2029, 623 2014

Abstract:

A mobile bearing knee prosthesis enables a surgeon to convert a mobile bearing insert having articular surfaces, supported by a tibial base plate or tray from a rotating and translating prosthesis to one that rotates only. This conversion is accomplished with a fastener or locking member that connects through an opening in the insert to the tibial base plate. This prosthesis can be used as part of a total knee surgery when the surgeon chooses to use a prosthesis that incorporates a movable articular surface. In one embodiment, a projecting portion extends proximally from the insert and cooperates with a cam on the femoral component. The projecting portion can be a post extending up from the proximal surface of the insert and the femoral component includes an intercondylar surface that may contact the post to constrain the relative motion between the femoral component and the insert. In another embodiment, the insert is a two part assembly that includes a larger member with a central opening and a smaller member that fits the opening.

US Patent:

6645251, Nov 11, 2003

Filed:

Jan 22, 2002

Appl. No.:

10/055248

Inventors:

Abraham Salehi - Bartlett TN
Mark Harbaugh - Germantown TN
Willard L. Sauer - Wernersville PA
Christopher Patrick Carson - Memphis TN

Assignee:

Smith Nephew, Inc. - Memphis TN

International Classification:

A61F 238

US Classification:

623 2028, 623 2029, 623 1811

Abstract:

Artificial implants having reduced area to provide reduced wear are provided. The reduced area is particularly located at areas where greatest wear is exhibited. In a particular embodiment of a mobile bearing knee implant, the area is reduced on the mobile bearing insert underside, where it contacts a tibial component. The reduced area may be any shape of indentations, for example, grooves, dimples, straight patterns, curved patterns, crossing patterns, holes, channels or slots. The indentations may be various sizes, and have been found to be particularly effective if covering about 10% to about 20% of the insert at depths between about 1-2 mm.

US Patent:

6827723, Dec 7, 2004

Filed:

Feb 27, 2002

Appl. No.:

10/084278

Inventors:

Christopher P. Carson - Memphis TN

Assignee:

Smith Nephew, Inc. - Memphis TN

International Classification:

A61B 1900

US Classification:

606130

Abstract:

Systems and processes for tracking anatomy, instrumentation, trial implants, implants, and references, and rendering images and data related to them in connection with surgical operations, for example unicompartmental knee arthroplasties (âUKAâ). These systems and processes are accomplished by using a computer to intraoperatively obtain images of body parts and to register, navigate, and track surgical instruments.

US Patent:

6923817, Aug 2, 2005

Filed:

Feb 27, 2002

Appl. No.:

10/084012

Inventors:

Christopher Patrick Carson - Collierville TN, US
Christopher M. Lyons - Hernando MS, US

Assignee:

Smith & Nephew, Inc. - Memphis TN

International Classification:

A61B019/00

US Classification:

606130, 128898

Abstract:

Systems and processes for tracking anatomy, instrumentation, trial implants, implants, and references, and rendering images and data related to them in connection with surgical operations, for example total knee arthroplasties (“TKA”). These systems and processes are accomplished by using a computer to intraoperatively obtain images of body parts and to register, navigate, and track surgical instruments.

US Patent:

6953479, Oct 11, 2005

Filed:

Jul 16, 2001

Appl. No.:

09/906468

Inventors:

Christopher Patrick Carson - Collierville TN, US
Dwight T. Todd - Columbia IN, US
Michael David Ries - Tiburon CA, US

Assignee:

Smith & Nephew, Inc. - Memphis TN

International Classification:

A61F002/38

US Classification:

623 2015, 623 2032, 623 2035

Abstract:

A stem extension for surgical implants such as tibial or femoral knee implants. The stem extension is interposed between the stem and its load bearing component (i. e. , tibial tray or condylar component) and angularly orients the attached stem relative to the load bearing component to facilitate positioning of the stem in the bone canal and alignment of the load bearing component with the mechanical axis of the leg. The extension includes a female taper that engages the load bearing component. The extension also includes a male taper having a longitudinal axis oriented at an angle relative to the longitudinal axis of the female taper. Engagement of the male taper with the stem thereby orients the stem at an angle relative to the longitudinal axis of the load bearing component. Because the bone canal into which the stem is inserted is oftentimes angled relative to the mechanical axis of the leg, such orientation of the stem adjusts for the contour and/or angulation of the canal and facilitates positioning of the stem in the canal in a manner that promotes the desired alignment between the load bearing component and the mechanical axis of the leg, thereby allowing the implant to more closely replicate the geometry of the knee and leg. In addition to being oriented angularly, the female and male taper of the extension may also be offset parallel to facilitate insertion of the stem into canals that are not only angled relative to, but also offset from, the mechanical axis of the leg.

US Patent:

7547307, Jun 16, 2009

Filed:

Aug 27, 2002

Appl. No.:

10/229372

Inventors:

Christopher Patrick Carson - Collierville TN, US
Crista Smothers - Cordova TN, US
Christopher M. Lyons - Hernando MS, US

Assignee:

Smith & Nephew, Inc. - Memphis TN

International Classification:

A61F 2/38

US Classification:

606 88, 606 87, 606 89

Abstract:

Instrumentation, systems, and processes for tracking anatomy, instrumentation, trial implants, implants, and references, and rendering images and data related to them in connection with surgical operations, for example total knee arthroplasties (“TKA”). These instrumentation, systems, and processes are accomplished by using a computer to intraoperatively obtain images of body parts and to register, navigate, and track surgical instruments. Disclosed in this document are also alignment modules and other structures and processes which allow for coarse and fine alignment of instrumentation and other devices relative to bone for use in connection with the tracking systems of the present invention.

US Patent:

7662156, Feb 16, 2010

Filed:

Jun 22, 2004

Appl. No.:

10/873041

Inventors:

Christopher P. Carson - Collierville TN, US

Assignee:

Smith & Nephew, Inc. - Memphis TN

International Classification:

A61F 2/76

US Classification:

606102, 606 88, 623914

Abstract:

According to one embodiment, a method for determining a joint line position includes: providing a femoral trial component, the femoral trial component comprising an anterior flange and at least one mark on the anterior flange of the femoral trial component to indicate a desired patellofemoral contact point in extension; referencing the mark on the femoral trial component during a surgical procedure to assist in determining a proper superior-inferior joint line position between a tibial prosthetic component and a femoral prosthetic component; installing the femoral prosthetic component based at least in part on the determination of the proper superior-inferior joint line position between the tibial component and the femoral component; installing the tibial prosthetic component based at least in part on the determination of the proper superior-inferior joint line position; and completing the surgical procedure with the femoral component and tibial component in proper position is described.

US Patent:

8109942, Feb 7, 2012

Filed:

Apr 21, 2005

Appl. No.:

11/111325

Inventors:

Christopher Patrick Carson - Collierville TN, US

Assignee:

Smith & Nephew, Inc. - Memphis TN

International Classification:

A61B 19/00

US Classification:

606130

Abstract:

A method for performing shoulder arthroplasty or hemiarthroplasty is provided. The method includes generating navigational reference information relating to position and orientation of a body part forming at least a portion of the shoulder joint. The reference information may be stored in a computer. Navigational references are attached to the body part and an object. Information is received regarding the position and orientation of the object with respect to the body part and the object is navigated according to this information. The body part may be modified using the object and the modification may be displayed on a monitor associated with the computer. The navigational references may be used to track a shoulder arthroplasty trial component. Information is received regarding the position and orientation of the trial component with respect to the body part. This information is used to navigate the trial component to the body part.