Marc Weissman

US Patent:

6977000, Dec 20, 2005

Filed:

Jun 30, 2003

Appl. No.:

10/610460

Inventors:

Thomas M. Vanasse - Thomaston CT, US
David Robert Tuttle - Memphis TN, US
Marc Gary Weissman - Warsaw IN, US

Assignee:

DePuy products, Inc. - Warsaw IN

International Classification:

A61F002/32

US Classification:

623 2242, 623 2245

Abstract:

A modular trial neck segment is utilized for trialing a hip prosthesis for a total hip arthroplasty. The modular trial neck segment is preferably, but not necessarily, utilized for trialing a hip prosthesis for a total hip arthroplasty. The trial neck segment includes a mount attachable to a stem or broach, and a neck that is translatable on the mount for providing various neck offsets with respect to the mount and/or broach. Neck offset is changed via movement of the neck in a single plane of motion. This facilitates the use of the subject invention in minimally invasive arthroplasty wherein working dimensions are small. The present design replicates the biomechanics of the neck region of the implant. The mount and slidable neck provide a plurality of neck offsets and/or neck lengths for trialing a final prosthesis in a single device.

US Patent:

58241000, Oct 20, 1998

Filed:

Oct 30, 1996

Appl. No.:

8/741435

Inventors:

Mark A. Kester - Upper Saddle River NJ
Marc G. Weissman - Derby CT

Assignee:

Osteonics Corp. - Allendale NJ

International Classification:

A61F 242

US Classification:

623 20

Abstract:

A knee prosthesis in which engagement between the femoral component and the tibial component of the knee prosthesis takes place at a contact area along articular surface areas including complementary medial-lateral surface profile contours having a single medial-lateral articular radius defining an arcuate profile, and anterior-posterior surface profile contours along the femoral component and the tibial component, the anterior-posterior surface profile contour of the femoral component having an essentially constant anterior-posterior articular radius throughout regions of the femoral component which contact the tibial component within a primary range of flexion, the center of the anterior-posterior articular radius being located along a line extending laterally between the medial and lateral attachment points of the collateral ligaments of the knee, such that the contact area along the articular surface areas is maintained at a maximum throughout at least the primary range of flexion for minimizing stresses in the tibial component and better balancing tension in the collateral ligaments during articulation of the knee prosthesis at least within the primary range of flexion, and further including an eminence projecting from the tibial component toward the femoral component, and a follower on the femoral component for engaging the eminence for controlled restraint of the femoral component during a limited portion of the primary range of flexion.

US Patent:

57698546, Jun 23, 1998

Filed:

Aug 23, 1996

Appl. No.:

8/703597

Inventors:

Adam C. Bastian - Westwood NJ
Marc G. Weissman - Derby CT
Michael E. Wolak - Leonia NJ

Assignee:

Osteonics Corp. - Allendale NJ

International Classification:

A61B 1758
A61B 1760

US Classification:

606 88

Abstract:

An instrument system and method are disclosed for preparing a distal femur for the implant of a femoral component of a knee prosthesis by the removal of natural bone in the intercondylar area of the distal femur to prepare a femoral notch, including a patella recess, subsequent to establishing distal, anterior and chamfer surfaces at the distal femur. The instrument system includes a femoral notch cutting guide for placement over the distal, anterior and chamfer surfaces of the prepared distal femur, and a femoral notch cutting punch. The femoral notch cutting punch is engaged with a first guideway in the femoral notch cutting guide to remove natural bone from the intercondylar area and establish the patella recess, and subsequently is engaged with a second guideway in the femoral notch cutting guide, transverse to the first guideway, to remove natural bone from the intercondylar area and complete the femoral notch.

US Patent:

58715401, Feb 16, 1999

Filed:

Jul 30, 1996

Appl. No.:

8/690306

Inventors:

Marc G. Weissman - Derby CT
Mark A. Kester - Upper Saddle River NJ

Assignee:

Osteonics Corp. - Allendale NJ

International Classification:

A61F 238

US Classification:

623 20

Abstract:

A patellar component of a prosthetic knee joint includes a domed portion having a peak offset from the center of the patellar component for effecting compensation for the displacement of the mechanical joint line upon implant of the prosthetic knee joint so as to enable affixation of the patellar component within the natural patella with sufficient bone coverage while attaining appropriate sliding engagement of the patellar component with a patellar groove in the femoral component of the prosthetic knee joint during articulation of the knee.