John H Insall

US Patent:

6402786, Jun 11, 2002

Filed:

Jun 29, 2000

Appl. No.:

09/606608

Inventors:

John N. Insall - New York NY
Mark Heldreth - Mentone IN
Vince Webster - Warsaw IN
Steve Zawadski - Leesburg IN
Roy Yoshikazu Hori - Tokyo, JP
Kyoko Ohkuni - Shizuoka, JP
Audrey Beckman - Warsaw IN
William Rohr - Cincinnati OH

Assignee:

Zimmer, Inc. - Warsaw IN

International Classification:

A61F 238

US Classification:

623 2035

Abstract:

A femoral knee implant includes a fourth compartment of articulation. The superior posterior articulating surface is achieved by first increasing the thickness of the superior posterior condylar portion of the femoral component to widen the superior posterior edge of the posterior condyle. Second, the newly created surface at the superior posterior condyle is smoothly rounded to provide an articular surface with no sharp changes in the surface contours. In one embodiment, the fourth articular compartment of this invention is provided in a one piece femoral design. In another embodiment, it is provided as a modular addition to an existing prior art femoral component. In another embodiment, the fourth compartment is combined with a posterior stabilized (PS) TKR design that includes a tibial post and cooperating femoral cam characterized by low engagement of the cam on the spine.

US Patent:

55711979, Nov 5, 1996

Filed:

May 17, 1995

Appl. No.:

8/443412

Inventors:

John N. Insall - Scarsdale NY

International Classification:

A61F 238

US Classification:

623 20

Abstract:

A tibial knee component includes reference marks to which a surgeon can reference the location of the point of contact between the tibial component and a femoral knee component. In one embodiment of the invention, the femoral component also includes reference marks to aid the surgeon in determining the contact point and to aid in orienting the knee in specific predetermined degrees of flexion.

US Patent:

57255849, Mar 10, 1998

Filed:

Apr 26, 1996

Appl. No.:

8/638085

Inventors:

Peter Stanley Walker - Middlesex, GB2
John Nevil Insall - New York NY

International Classification:

A61F 238

US Classification:

623 20

Abstract:

A femoral prosthesis is disclosed comprising a bicondylar femoral component (41), a tibial component (72) and at least one meniscal component (42) interposed between the femoral and tibial components, the femoral component including a pair of condylar surfaces (46) separated by a patella bearing surface (44) which in use provides a normal anatomical patella lever arm, the condylar surfaces being shaped for substantial conformity with corresponding tibial bearing surfaces (47) of the meniscal component or components over the entire range of normal flexion.

US Patent:

59892617, Nov 23, 1999

Filed:

Jul 29, 1997

Appl. No.:

8/898360

Inventors:

Peter Stanley Walker - Middlesex, GB
John Nevil Insall - New York NY
Jonathan Blamey - Wiltshire, GB
Michael Wadcock - Wiltshire, GB
Mark Alan Heldreth - Mentone IN
Shawn Elliott McGinley - Forth Wayne IN
Steven A. Zawadzki - Leesburg IN

Assignee:

Zimmer, Ltd.

International Classification:

A61F 228

US Classification:

606102

Abstract:

The invention provides means for evaluating the fit of a knee replacement prosthesis on a resected tibial surface. A provisional instrument for this purpose includes a positioning tray having a peripheral profile corresponding to that of the tibial platform of the prosthesis, the tray having an upper surface and an under surface which is substantially flat and free from projections and the tray having a plurality of holes for receiving pins for temporarily attaching the positioning tray in a desired position on the resected tibial surface. Also disclosed is a jig for guiding, drilling and broaching operations, the jig having an aperture which is shaped to guide the broach. In addition, the invention includes a tibial broach which includes a hollow body having an upper end and a lower end and having an anvil at its upper end, an interior face and a posterior face which slopes downwardly towards a lower end, the posterior face having a series of teeth which are formed in the hollow body, such that bone cut by the teeth as the broach is driven into an intramedullary canal of a tibia passes into the hollow body.

US Patent:

57558019, May 26, 1998

Filed:

Jul 18, 1994

Appl. No.:

8/276850

Inventors:

Peter Stanley Walker - Moor Park, Middlesex HA6 2HP, GB2
John Nevil Insall - New York NY

International Classification:

A61F 238

US Classification:

623 20

Abstract:

A condylar replacement knee prosthesis has a tibial platform adapted for attachment to a resected tibia, a femoral component adapted for attachment to a resected femur and a plastics meniscal component interposed between the femoral and tibial components. The upper surface of the meniscal component is shaped to correspond with bearing surfaces of the femoral component. The meniscal component is guided for sliding movement in an anterior-posterior direction on the tibial component and for limited rotational movement, the rotational movement being centred about an axis which is displaced medially from the anterior-posterior centre line of the tibial component.

US Patent:

42132096, Jul 22, 1980

Filed:

May 22, 1978

Appl. No.:

5/908130

Inventors:

John N. Insall - New York NY
Peter S. Walker - Ridgewood NJ

Assignee:

New York Society for the Relief of the Ruptured and Crippled - New York NY

International Classification:

A61F 124

US Classification:

3 1911

Abstract:

A knee joint prosthesis comprises a femoral component having laterally spaced-apart condylar portions shaped to match generally the shapes of the condylar surfaces of the femur and a tibial component having a plate-like platform portion which includes laterally spaced-apart concavities in the external surface, each of which receives and supports one of the condylar portions of the femoral component in all positions of the leg. The femoral component has a box-like intercondylar portion interconnecting the condylar portions and defining an intercondylar recess which receives a post that extends upwardly from the tibial component. At and near full extension of the leg, any tendency for posterial dislocation of the femur results in engagement between the anterior surfaces of the post and recess to prevent posterial dislocation of the femoral component relative to the tibial component. At leg flexions approaching full flexure, the posterior surface of the recess engages the posterior surface of the post in the event of a tendency toward anterial dislocation of the femur, thereby preventing anterial dislocation. Large antero-posterior movements and dislocation are prevented in all leg positions by engagement between surfaces of the post and recess.

US Patent:

61237299, Sep 26, 2000

Filed:

Mar 10, 1998

Appl. No.:

9/037417

Inventors:

John N. Insall - New York NY
Mark Heldreth - Mentone IN
Vince Webster - Warsaw IN
Steve Zawadski - Leesburg IN
Roy Yoshikazu Hori - Tokyo, JP
Kyoko Ohkuni - Shizuoka, JP
Audrey Beckman - Warsaw IN
William Rohr - Cincinnati OH

Assignee:

Bristol-Myers Squibb Company - New York NY

International Classification:

A61F 238

US Classification:

623 2031

Abstract:

A femoral knee implant includes a fourth compartment of articulation. The superior posterior articulating surface is achieved by first increasing the thickness of the superior posterior condylar portion of the femoral component to widen the superior posterior edge of the posterior condyle. Second, the newly created surface at the superior posterior condyle is smoothly rounded to provide an articular surface with no sharp changes in the surface contours. In one embodiment, the fourth articular compartment of this invention is provided in a one piece femoral design. In another embodiment, it is provided as a modular addition to an existing prior art femoral component. In another embodiment, the fourth compartment is combined with a posterior stabilized (PS) TKR design that includes a tibial post and cooperating femoral cam characterized by low engagement of the cam on the spine.

US Patent:

51084015, Apr 28, 1992

Filed:

Apr 12, 1991

Appl. No.:

7/685452

Inventors:

John N. Insall - New York NY
Steven B. Haas - New York NY
James M. Carr - Cos Cob CT

Assignee:

New York Society for the Relief of the Ruptured and Crippled,
Maintaining the Hospital for Special Surgery - New York NY

International Classification:

A61F 238

US Classification:

606 79

Abstract:

A patella cutting clamp comprises a pair of jaw members joined together in scissors-like relation for pivotal movement relative to each other about a pivot axis intermediate their ends. Each jaw member has a handle portion extending in one direction from the pivot axis and a jaw portion extending in the other direction. The jaw portions have edges facing each other that are shaped for engagement with opposite borders of a patella. Teeth along the patella-gripping edges grip and hold the patella firmly. Saw guide slots in the jaw portions lying in a common plane guide the saw when the saw cut is made. A patella elevator member is attached to the jaw members for movement along the pivot axis and has a platform portion adapted to engage the anterior aspect of the patella. A mechanism is provided for establishing and maintaining a predetermined position of the elevator member relative to the jaw members and thereby positioning the patella at a predetermined position relative to the saw guide slots. Another mechanism holds the jaw members in an adjusted position relative to each other with the jaw portions engaging and holding the patella.