Prosthetic device and method of implantation

Patent 5002580 Issued on March 26, 1991. Estimated Expiration Date:

October 7, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Re31865

2719522

3067740

3793650

3820167

3874003

3894297

3906550

3924275

Hip joint prosthesis
Patent #: 3938198
Issued on: 02/17/1976
Inventor: Kahn , et al.

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Inventors

Application

No. 255206 filed on 10/07/1988

US Classes:

623/23.23Having intramedullary

Examiners

Primary: Isabella, David J.

Attorney, Agent or Firm

Pennie & Edmonds

Foreign Patent References

0187903 EP. 07/21/1986
2247721 DE 04/21/1974
2628929 DE 01/21/1977
2475892 FR. 08/21/1981
2549718 FR 02/21/1985
2575383 FR 07/21/1986
2600527 FR 12/21/1987
471394 IT 03/21/2013
1409053 GB 10/21/1975
2162065 GB 01/21/1986
WO88/01854 WO 03/21/1988
WO89/08436 WO. 09/21/1989

International Class

A61F 002/32

Abstract

The bone prosthesis of the present invention comprises a first body member or stem for placement into a bone cavity, such as an intramedullary canal. The body member is configured and dimensioned so as to provide a nonuniform interference press-fit. The apparatus further comprises a second body member or broach for placement into the broach configured and dimensioned so as to prepare and removal from a bone cavity, the bone cavity so as to provide a nonuniform interference press-fit with the stem. THe apparatus further comprises a distal sleeve configured and dimensioned so as to be attached to the stem so as to centralize the stem in the bone cavity. The distal sleeve preferably is provided with an interior conical slope and an exterior conical slope on a portion thereof to aid in insertion into the canal. The stem further comprises at least one groove and preferably a plurality of grooves along its corners. These grooves are nonparallel to the longitudinal axis of the stem and do not extend over any one entire side of the stem. The stem can be provided with an area of cancellous texture which comprises substantially randomly patterned array of multiple curved-line surface unevenness, such as indentations or protrusions. The present invention also is directed to a method comprising utilization of the broach, the stem and the distal sleeve so as to provide a nonuniform press-fit between the bone prosthesis and the bone cavity while centralizing the stem in the bone cavity.

Other References

Osteonics Technical Bulletin, Issue: Thigh Pain, 1988
Whiteside, et al., The Effects of Collar on Total Hip Femoral Component Subsidence, 231 Clinical Orthopedics and Related Research 120 (Jun. 1988)
Whiteside Total Hip System, Dow Corning Wright, Nov. 198