Michael R Weber

US Patent:

42850711, Aug 25, 1981

Filed:

Jul 2, 1979

Appl. No.:

6/054027

Inventors:

Carl L. Nelson - Little Rock AR
Darrel W. Haynes - Little Rock AR
Michael J. Weber - Little Rock AR

International Classification:

A61F 103

US Classification:

3 1912

Abstract:

A prosthetic cement spacer for controlling the thickness of cement applied between a prosthetic insert and a support member, such as an acetabulum, includes a generally cylindrical standoff body portion fabricated from acrylic bone cement and a pointed wire concentric with said standoff body and outwardly extending from one end a sufficient length to anchor into the acetabulum bone surface. The method of use of these prosthetic cement spacers involves preparation of the acetabulum so that there is sufficient clearance space for the prosthetic cement spacers and then to insert the pointed wires into the acetabulum bone surface in an equilateral triangular arrangement thereby providing three points of contact for the prosthetic insert, such as an acetabular cup. By selecting three prosthetic cement spacers all having substantially the same standoff body height, the clearance region between the acetabulum bone surface and the acetabular cup is controlled and provides a uniform cement thickness throughout thereby providing an improved bonding arrangement.

US Patent:

44175710, Nov 29, 1983

Filed:

Nov 10, 1980

Appl. No.:

6/205455

Inventors:

Carl L. Nelson - Little Rock AR
Darrel W. Haynes - Little Rock AR
Michael J. Weber - Little Rock AR

International Classification:

A61F 124

US Classification:

128 92B

Abstract:

A prosthetic cement spacer for controlling the thickness of cement applied between a prosthetic insert and a support member, such as an acetabulum, includes a generally cylindrical standoff body portion fabricated from acrylic bone cement and a pointed wire concentric with said standoff body and outwardly extending from one end a sufficient length to anchor into the acetabulum bone surface. The method of use of these prosthetic cement spacers involves preparation of the acetabulum so that there is sufficient clearance space for the prosthetic cement spacers and then to insert the pointed wires into the acetabulum bone surface in an equilateral triangular arrangement thereby providing three points of contact for the prosthetic insert, such as an acetabular cup. By selecting three prosthetic cement spacers all having substantially the same standoff body height, the clearance region between the acetabulum bone surface and the acetabular cup is controlled and provides a uniform cement thickness throughout thereby providing an improved bonding arrangement.