Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Leg
Reexamination Certificate
2000-07-27
2001-11-27
Snow, Bruce (Department: 3738)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Leg
C623S022110, C623S043000
Reexamination Certificate
active
06322594
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a hip joint for an artificial leg. The upper side of the hip joint has connection means for attachment to a prosthesis basket, and the underside of the hip joint is designed for releasable attachment to the artificial leg. An extension limit stop defines the starting position of the hip joint in extension.
Such an embodiment can be found in EP 0,093,867 B1. In this previously disclosed hip joint, a first joint part screwed to a connection means is connected via a pivot joint to a second joint part provided for connection to the artificial leg. The pivoting movement of the second joint part is limited by stops for the standing and sitting positions of the artificial leg. The hip joint is designed with one axis and accordingly has only one degree of freedom, and the second joint part and the artificial leg connected to it can swivel in only one plane. By contrast, the very much more complicated movement of a natural hip joint takes place in three planes.
Another design comparable to the hip joint described above is disclosed in EP 0,285,328 B1.
SUMMARY OF THE INVENTION
The main object of the invention is to develop a hip joint of the above-mentioned structural type that is adapted more to the natural pattern of hip and leg movement and thus permits as comfortable a gait as possible.
In accomplishing the foregoing and other objects, there has been provided according to the present invention a hip joint for connecting an artificial leg to a prosthesis mounting part, the hip joint comprising:
an upper transverse link having on its upper side a connector for attachment to a prosthesis mounting part:
a lower transverse link having on its underside a connector for releasable attachment to an artificial leg;
a front link articulated at its upper section, via a first joint, to a front section of the upper transverse link and articulated at its lower section, via a third joint connection, to a front section of the lower transverse link, wherein the first and third joint connections together have at least five degrees of freedom;
a rear link articulated at its upper section, via a second joint connection, to a rear section of the upper transverse link and at its lower section, via a fourth joint connection, to a rear section of the lower transverse link,
wherein the second joint connection comprises a hinge pin having its pivot axis approximately perpendicular to the sagittal plane and has one degree of freedom, and
wherein the fourth joint connection has a pivot axis with mediolateral and anteroposterior inclination with respect to the sagittal plane and has one degree of freedom, whereby a swiveling about the pivot axis of the second joint connection causes outward/inward swiveling and abduction/adduction of the lower transverse link; and
an extension limit stop defining the starting position of the hip joint in extension.
Further objects, features and advantages of the invention will become apparent from the detailed description of preferred embodiments that follows, when considered in conjunction with the accompanying figures of drawing.
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patent: 4904270 (1990-02-01), Cooper
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patent: 5800567 (1998-09-01), Cooper et al.
patent: 5948021 (1999-09-01), Radcliffe
patent: 6187052 (2001-02-01), Molino et al.
patent: 311 462 (1919-03-01), None
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Naeder et al., Otto Bock Prothesen-Kompendium, Prothesen fuer die untere Extremitaet, Schiele & Schoen, 1987, pp. 28-31, 66-71, 88-91.
Boiten Herman
Wagner Helmut
Foley & Lardner
Otto Bock Orthopaedische Industrie Besitz-und Verwaltungs-Komman
Snow Bruce
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