Knock-out instrument for the shanks of hipjoint prostheses

Details Knock-out instrument for the shanks of hipjoint prostheses Knock-out instrument for the shanks of hipjoint prostheses

1992-05-07

1993-03-23

Hafer, Robert A.

Surgery

Instruments

Orthopedic instrumentation

606100, A61F 232

Patent

active

051960184

ABSTRACT:
The invention shows knock-out instruments for the shanks of hipjoint prostheses, the said instrument consisting of a shank (1) with a coupling-part for a sliding hammer (not shown) as well as of an extension-piece (3) which may be applied in the knock-out direction. The extension-piece (3) is connected rigidly to the shank and stands away from it like a foot at an angle .alpha. of between 20.degree. and 60.degree.. The extension-piece exhibits a recess (8) which may be slid from one side over the neck of a hipjoint prosthesis and encircles it over an angle of up to 180.degree., the width inside the recess measured across the 180.degree. being greater by a clearance than the smallest diameter of the neck of the prosthesis, measured in the same direction. The recess is further formed so that it engages the prosthesis in the area of the neck at three points arranged to lie in a plane substantially parallel to the axis of the shank so that, when the line of action of the sliding hammer is offset relative to the shank axis, a moment generated thereby is opposed by a moment generated between the extension piece and the neck at these three points.

REFERENCES:
patent: 3801989 (1974-04-01), McKee
patent: 3818514 (1974-06-01), Clark
patent: 3857389 (1974-12-01), Amstutz
patent: 3955568 (1976-05-01), Neufeld
patent: 4222382 (1980-09-01), Antonsson
patent: 4459985 (1984-07-01), McKay
patent: 4642121 (1987-02-01), Keller
patent: 4927425 (1990-05-01), Lozier
patent: 4995875 (1991-02-01), Coes

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