Aaron A Hofmann
Physician in Salt Lake City, UT

7780738, Aug 24, 2010

Dec 21, 2004

11/020424

Ashok C. Khandkar - Salt Lake City UT, US
Aaron A. Hofmann - Salt Lake City UT, US
Ramaswamy Lakshminarayanan - Salt Lake City UT, US

Amedica Corporation - Salt Lake City UT

A61F 2/42

623 2215

A ceramic-metal composite articulation is provided with substantial elimination of wear debris, wherein a ceramic material is provided with superior mechanical properties tailored for articulating with ceramic articulations having high flexural strength (greater than about 700 MPa), high fracture toughness (greater than about 7 MPam) and a high Weibull modulus (greater than about 20), in comparison with presently available bio-ceramics such as alumina or zirconia. The mechanical property enhancement enables ceramic materials with greater reliability and significantly reduced in-vivo fracture risk to be obtained. Preliminary in-vitro wear performance, to several million cycles using established test protocols, of head/cup components in a prosthetic hip joint made from these ceramics also demonstrates the ultra low wear characteristics. These material properties substantially eliminate polyethylene (PE) wear debris mediated implant failures by offering an optimal combination of bio-mechanical safety and reliability with ultra low wear performance.

8105386, Jan 31, 2012

Feb 4, 2004

10/771887

Aaron A. Hofmann - Salt Lake City UT, US
James William Burrows - Austin TX, US

Zimmer, Inc. - Warsaw IN

A61F 2/38

623 2029

The present invention is directed to a rotating/non-rotating tibia base plate/insert system. In one illustrative embodiment, the device comprises a tibia base plate, an insert adapted to be positioned above the base plate, and at least one removable pin that, when installed, engages at least a portion of the insert and the base plate to thereby prevent relative rotation between the insert and the base plate. In one illustrative embodiment, the method comprises obtaining a prosthetic knee assembly comprised of a tibia base plate, a tibia insert and a removable pin, the assembly being adapted to be configured in a first state such that the tibia insert may rotate relative to the base plate or in a second state such that said tibia insert cannot rotate relative to said base plate, making at least one incision adjacent a patient's knee, installing the prosthetic knee assembly in the patient, wherein the removable pin is removed such that the assembly is in the first state wherein the tibia insert may rotate relative to the tibia base plate, and closing the incision.

5871543, Feb 16, 1999

Feb 20, 1997

8/803537

Aaron A. Hofmann - Salt Lake City UT

A61F 238

623 20

An improved tibial prosthesis is provided for a prosthetic knee wherein the tibial prosthesis includes a mobile bearing member designed to better accommodate a natural range of flex knee motion and force loads applied to the knee joint. The improved tibial prosthesis comprises a tibial component defining a support tray for receiving and supporting a bearing member which in turn defines upwardly presented medial and lateral condylar recesses for respective seated engagement with medial and lateral condyles of a femoral prosthesis. A short lock rim of part-circular shape projects upwardly from the periphery of the tibial support tray, at the medial end thereof, to engage and constrain the bearing member for rotation within the lock rim through a short arcuate path of motion relative to a center axis defined by the geometry of the lock rim, thereby permitting a small degree of anterior-posterior movement of the bearing member lateral end relative to the tibial tray. The range of permissible bearing member displacement can be limited by a stop post projecting upwardly from the tibial tray and received into an elongated guide slot formed in the bearing member.

6074424, Jun 13, 2000

Jan 23, 1998

9/012532

Charles H. Perrone - Park City UT
Aaron Hofmann - Salt Lake City UT
Charles W. Mumme - Austin TX

Sulzer Orthopedics Inc. - Austin TX

A61F 238

623 20

An implantable orthopedic knee joint prosthesis includes a femoral component having an internal box geometry defined by a bone-engaging surface configured as a primary prosthesis. The femoral component has a threaded bore therein communicating with the bone-engaging surface. An adapter has a mating surface complementary to the box geometry of the femoral component and an internal box geometry defined by a bone-engaging surface configured as a revision prosthesis. A hole through the adapter is aligned with the threaded bore of the femoral component and has a recessed shoulder. An adapter screw has a head and a threaded shank, the head sized to be received within the hole of the adapter in engagement with the shoulder, and the shank being sized to be threadedly received within the threaded bore of the femoral component. The adapter screw includes a threaded bore therein. A spacer has a mating surface complementary to the box geometry of the adapter and an internal box geometry defined by a bone-engaging surface configured as a revision prosthesis.

5053039, Oct 1, 1991

Apr 25, 1991

7/691394

Aaron A. Hofmann - Salt Lake City UT
Albert G. Burdulis - Salt Lake City UT

Intermedics Orthopedics - Austin TX

A61F 504

606 87

A method and apparatus for performing an upper tibia osteotomy comprising cutting a wedge from the bone using a first guide assembly to cut a first slot partially through a bone and a second guide assembly to cut a second intersecting slot to define a wedge shaped bone segment. An external compressor device draws the osteotomy closed by plastic deformation of the unsevered portion of the bone. The bone is secured by a plate and screws.

7776085, Aug 17, 2010

Sep 8, 2005

11/223376

John P. Bernero - Round Rock TX, US
Ashok C. Khandkar - Salt Lake City UT, US
Ramaswamy Lakshminarayanan - Salt Lake City UT, US
Aaron A. Hofmann - Salt Lake City UT, US

Amedica Corporation - Salt Lake City UT

A61F 2/24

623 232

An improved knee prosthesis includes a ceramic tibial component for articulation with natural or prosthetic (re-surfaced) femoral surfaces. The ceramic tibial component is provided in the form of a ceramic monoblock adapted for fixation relative to the patient's tibial bone, or alternately in the form of a ceramic bearing insert component carried by a tibial baseplate member which is adapted in turn for fixation relative to tibial bone. In either form, the ceramic tibial component includes at least one upwardly concave articulation surface for movable bearing engagement by a generally convex or condylar shaped femoral articulation surface. The ceramic tibial component provides improved wear characteristics with extended service life.

5480452, Jan 2, 1996

Oct 21, 1993

8/140772

Aaron A. Hofmann - Salt Lake City UT
James E. Williams - Austin TX

Intermedics Orthopedics, Inc. - Angleton TX

A61F 232, A61F 228

623 23

A prosthesis having a proximal portion of a stem formed as a wedge having opposed tapers such that prostheses can be thrust into a medullary canal and achieve fixation without unduly stressing the cortical bone remaining in the femur. Ribs secure the prosthesis against medial-lateral motion. Simultaneously, a degree of flexibility is provided in an anterior-posterior direction. A slotted distal portion of the stem is flared to enhance fixation distally.

8133284, Mar 13, 2012

Mar 26, 2010

12/661991

K. Scott Ely - Austin TX, US
Ashok C. Khandkar - Salt Lake City UT, US
Ramaswamy Lakshminarayanan - Salt Lake City UT, US
Aaron A. Hofmann - Salt Lake City UT, US

Amedica Corporation - Salt Lake City UT

A61F 2/32

623 2211, 623 2238, 623 223, 623 2221, 623 2215, 623 2216

An improved hip prosthesis includes an acetabular cup bearing component constructed from a relatively hard and high strength ceramic material for articulation with a ball-shaped femoral head component which may be constructed from a compatible ceramic or metal material. In one form, the acetabular cup further includes a ceramic porous bone ingrowth surface adhered thereto for secure ingrowth attachment to natural patient bone.

5116375, May 26, 1992

Aug 27, 1990

7/572450

Aaron A. Hofmann - Salt Lake City UT

A61F 238

623 20

An improved knee joint prosthesis is provided of the type having a femoral component for attachment to the lower end of a patient's femur and an interengagable tibial component for attachment to the upper end of the patient's tibia. The tibial and femoral components are each formed from a high strength biocompatible material, with the tibial component typically supporting a meniscal bearing member of a high density plastic or the like for engaging the femoral component to accommodate natural or near-natural knee flexion. The bearing member includes an upwardly projecting stabilizing post having a posterior cam surface for engagement by a removably mounted stabilization rod extending between medial and lateral condyles of the femoral component. When used, the stabilization rod contacts the stabilization post during moderate to severe flexion of the knee prosthesis to extend the range of stable flexion of the prosthesis.