Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Reexamination Certificate
1998-06-09
2002-05-07
Isabella, David J. (Department: 3738)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
Reexamination Certificate
active
06383226
ABSTRACT:
TECHNICAL FIELD
The field of this invention is orthopaedics.
BACKGROUND OF THE INVENTION
Since its development in the 1960s, total hip arthroplasty has become an important procedure in the field of orthopaedics, and has been characterized as the “greatest single advance in modem orthopaedic surgery.” See Finerman, infra. Currently, approximately 125,000 hip replacements are performed in the United States alone each year, where the total cost of such procedures in the United States has been estimated to exceed $3 billion.
As such a variety of devices have been developed for use in hip replacement procedures. Like the natural hip, a hip replacement device consists of a ball and socket joint. Hip replacement involves the implantation (with or without cement) of a metal component having a ball on the upper (proximal) end into the proximal femur and the implantation of a plastic socket component into the pelvis (acetabulum). Loosening leads to pain and bone destruction resulting in the need for surgical revision. Loosening has been attributed to unnatural and inappropriate stresses that exist at the implant collar/bone interface and that exist within the bone (e.g., within the medial femoral cortex).
In an attempt to improve force and stress transfer between implant and bone, many hip replacement designs utilize a collar on the femoral component. Flat collars, as shown in
FIGS. 1A and 1B
, are one common design. A conical collar, as shown in
FIGS. 2A and 2B
, has provided improved results and is also currently employed. Other configurations that have been or are currently marketed include the tapered configuration shown in
FIGS. 3A and 3B
.
While a variety of different configurations have been developed since total hip arthroplasty was first developed, there continues to be interest in the development of new prostheses that can provide for better short- and/or long-term outcomes.
Relevant Literature
Total hip arthroplasty (as well as devices for use therein) is reviewed in Finerman et al.,
Total Hip Arthroplasty Outcomes,
(Churchill Livingston, Inc., 1998).
U.S. Pat. Nos. of interest describing different hip devices include: 5,725,594; 5,702,485; 5,387,244; 5,376,124; 5,336,265; 5,330,536; 5,314,489; 5,314,479; 5,197,990; 5,167,666; 5,133,772; 5,116,377; 4,938,771; RE 32,488; 4,661,112; 4,642,124; 4,546,501; 4,514,865; 4,488,320; 4,406,023; and 4,359,785.
SUMMARY OF THE INVENTION
Novel prostheses and methods for their use, particularly in hip replacement, are provided. The subject prostheses are elongate devices having a proximal and distal end, where the devices have the following elements going from the proximal to distal end: (a) a ball component; (b) a neck component; (c) a curvilinear collar component; and (d) a stem component. Also provided are methods of implanting hip prostheses in a manner sufficient to provide for a pressure profile at the collar interface in which the pressure increases from the endosteal to the periosteal surface of the bone.
REFERENCES:
patent: 3512184 (1970-05-01), Grove
patent: 3782373 (1974-01-01), Smythe
patent: 3916451 (1975-11-01), Buechel et al.
patent: 4012796 (1977-03-01), Weisman et al.
patent: 4488320 (1984-12-01), Wilson
patent: RE32488 (1987-09-01), Gustilo et al.
patent: 4908036 (1990-03-01), Link et al.
patent: 4944762 (1990-07-01), Link et al.
patent: 5116377 (1992-05-01), Skripitz et al.
patent: 5163964 (1992-11-01), Lazzeri et al.
patent: 5197990 (1993-03-01), Lawes et al.
patent: 5314479 (1994-05-01), Rockwood, Jr. et al.
patent: 5314489 (1994-05-01), Hoffman et al.
patent: 5376124 (1994-12-01), Gustke et al.
patent: 5387244 (1995-02-01), Breard
patent: 5725594 (1998-03-01), McTighe et al.
patent: 426096 (1997-06-01), None
patent: 1047640 (1953-12-01), None
patent: 2472374 (1981-07-01), None
patent: 2616060 (1988-12-01), None
patent: 2651674 (1991-03-01), None
Schurman, David S., et al., “C-2 Conical Collar™ Hip System, Unique Axisymmetrical Design Recreates Physiologic Loading Of The Femur,”Kirschner Orthopaedic Division, 70 West Aylesbury Road, Timonium, Maryland 21093.
Beaupre Gary S.
Carter Dennis R.
Mandell Jay A.
Schurman David J.
Bozicevic, Field & Francis
Field Bret E.
Isabella David J.
The Board of Trustees of the Leland Stanford Junior University
LandOfFree
Prostheses having curvilinear collars does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Prostheses having curvilinear collars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Prostheses having curvilinear collars will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2838222