FREDERICK F BUECHEL, MD
Medical Practice at 1 St, South Orange, NJ

5941911, Aug 24, 1999

Oct 17, 1997

8/953397

Frederick F. Buechel - South Orange NJ

A61F 228

623 16

A prosthetic system is provided for secure mounting of a prosthetic component to a bone, and particularly to a bone that may be diseased, damaged or deteriorated. The prosthetic system includes a plurality of screws that are mounted to healthy bone stock. Each screw includes a threaded portion extending from one end and a non-threaded portion extending from the opposed end. The non-threaded portion includes a discontinuous surface configuration thereon. Ends of the screws are positioned to support the prosthetic component. The bone cement is then disposed between the prosthetic component and the bone and in surrounding relationship to portions of the screws that project from the bone. The cement surrounds and attaches to the protrusions on the screws so that the screws and the cement reinforce one another in response to loads imposed thereon during use of the prosthesis.

5133764, Jul 28, 1992

Jun 10, 1988

7/205315

Michael J. Pappas - Caldwell NJ
Frederick F. Buechel - South Orange NJ

A61F 234

623 23

A multi-component hip joint prosthesis is provided comprising an acetabular cup and a plastic bearing liner, each of which defines a segmented open shell with an inferior segment thereof removed to provide enhanced flexibility. The enhanced flexibility substantially facilitates the assembly and disassembly of the components. The liner and the cup are retained in their assembled condition by interengagement between a plurality of ridges and at least one groove on the respective components. The plurality of independent ridges enhances the flexibility of the ridges, thereby further mimimizing the assembly forces required. Interengageable keys and keyways on the respective components may be provided to prevent relative rotation therebetween. The cup may comprise a removable tab to facilitate the insertion of a tool between the cup and the liner for prying the liner from the cup if necessary.

7485147, Feb 3, 2009

Feb 3, 2005

11/049813

Michael J. Pappas - Jensen Beach FL, US
Frederick F. Buechel - South Orange NJ, US

A61F 2/42

623 2118, 623 2018, 623 1811, 623 1715

The tibial component of a prosthetic ankle joint including a tibial component, a talar component, and an intermediate sliding plastic bearing, with the tibial component including a depending peripheral wall that surrounds and is spaced from the plastic bearing and is intended to reduce rubbing of the plastic bearing against tissue which would produce wear particles that lead to the formation of bone cysts. The depending peripheral wall of the tibial component is intended to reduce such possible abrasions by at least partially shielding the plastic bearing from the surrounding tissue.

5702448, Dec 30, 1997

Jul 5, 1995

8/498112

Frederick F. Buechel - South Orange NJ
Michael J. Pappas - Caldwell NJ

A61F 228

623 16

A prosthesis is provided having at least a smooth non-articulating load bearing surface disposed adjacent a bone. The prosthesis includes a substrate formed from a metallic alloy. At least the regions of the substrate defining the load bearing surface are coated with a biologically inert abrasion resistant material harder than the substrate for preventing leaching of ions from the substrate into adjacent body tissue and for preventing wear. The coating may be titanium nitride or zirconium or other such material exhibiting biological inertness and acceptable hardness. The coating preferably defines a thickness of 8-10 microns.

4969905, Nov 13, 1990

May 15, 1989

7/351834

Michael J. Pappas - Caldwell NJ
Frederick F. Buechel - South Orange NJ

A61F 228

623 16

Surgical method for facilitating bone healing using prosthetic device such as bone plates, stem-type prostheses such as femoral or humeral prostheses, or intrameduallary rods utilizing casting techniques that provide columnar or monocrystalline grain structure, with the <001> crystal direction oriented substantially parallel to the neutral axis, thereby increasing flexibility of the prosthesis and increasing loading on the bone, whereby disuse-atrophy is reduced and bone healing is facilitated; similarly, the crystal direction may be oriented to increase the stiffness of the prosthesis to resist tension.

5171283, Dec 15, 1992

Oct 22, 1990

7/603269

Michael J. Pappas - Caldwell NJ
Frederick F. Buechel - South Orange NJ

Biomedical Engineering Trust - S. Orange NJ

A61F 238

623 20

A prosthetic joint includes a first bearing element which is attached to a first bone and has a substantially flat bearing surface. A second element having a bearing surface is attached to a second bone. A bearing is disposed between the first and second elements. The bearing has a central axis and is defined by a first surface and a second surface. The first surface is substantially flat and is at least partially in contact with the first flat surface of the first element. At least a portion of the second surface is in contact with the surface of the second element. The area of the planform of the first surface of the bearing is smaller than, and dissimilar in shape from, the area of the planform defined by the second surface of the bearing.

4624674, Nov 25, 1986

Oct 1, 1984

6/656507

Michael J. Pappas - Caldwell NJ
Frederick F. Buechel - South Orange NJ

A61F 104

623 22

An improved spherical kinematic joint which allows ease and convenience of assembly and disassembly, particularly assembly, by providing a plurality of substantially physically distinct bearing inserts in a sub-assembly such that the bearing inserts are effectively a unitary structure for the purpose of assembly and disassembly but which bearing segments expand easily with low manual force during assembly and disassembly of the various bearing insert embodiments from the head and/or cavity or spherical seat in another joint element or member, such as for example in the prosthetic joint embodiments, an acetabular cup. Further, such ease of assembly and disassembly can be accomplished while retaining great dislocation and separation resistance and can be accomplished in a manner which does not introduce significant axial play.

5702466, Dec 30, 1997

May 16, 1996

8/648627

Michael J. Pappas - Caldwell NJ
Frederick F. Buechel - South Orange NJ

Biomedical Engineering Trust I - South Orange NJ

A61F 238

623 20

A joint prosthesis having a femoral element, a tibial element and a bearing for articulation therebetween is disclosed to further include an intermediate element. The intermediate element permits rotation of the bearing with respect to the tibial element and longitudinal translation of the bearing with respect to the intermediate element. Transverse translation of the bearing with respect to the intermediate element is precluded. In an alternative embodiment, the longitudinal translation may be limited either in the anterior or posterior direction.

5462548, Oct 31, 1995

Jul 6, 1992

7/908963

Michael J. Pappas - Caldwell NJ
Frederick F. Buechel - South Orange NJ

A61B 1700

606 80

An acetabular reamer is provided with a shaft having opposed front and rear ends. A mounting cap is securely connected to the front end of the shaft and includes a skirt having an interior surface spaced radially outwardly from the shaft and an opposed non-cylindrical exterior surface. At least one aperture extends through the skirt. A locking spring is disposed adjacent the interior surface of the skirt and includes a locking detent extending through the aperture in the skirt. The spring can be deflected radially inwardly to bring the detent into alignment with the exterior surface of the skirt. A reamer head is mountable over the mounting cap such that the rear wall of the reamer head deflects the spring radially inwardly during mounting and unmounting. In the fully mounted condition of the reamer head, the locking detent of the spring engages an inwardly facing surface of the rear wall of the reamer head. The. degree. acetabular reamer further includes a sleeve slidably and rotatably disposed around the shaft.