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Publication numberUS3806957 A
Publication typeGrant
Publication dateApr 30, 1974
Filing dateMar 22, 1973
Priority dateMay 4, 1972
Also published asDE2320683A1
Publication numberUS 3806957 A, US 3806957A, US-A-3806957, US3806957 A, US3806957A
InventorsY Shersher
Original AssigneeY Shersher
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Endoprosthesis of the proximal portion of the femur
US 3806957 A
Abstract
An endoprosthesis of the proximal portion of the femur, wherein a head and a neck are connected with a shaft by means of a threaded joint. For this purpose the proximal end of the shaft has a broadening part, wherein a seat for a threaded split shank fitted on the neck base is provided about the length of the neck axis. The split shank is fixed by a lock for the trochanter major. Accordingly, the latter lock is elongated and broadens toward the end disposed inside the shaft.
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Description  (OCR text may contain errors)

United States Patent Shersher 5] Apr. 30, 1974 [54] ENDOPROSTHESIS OF THE PROXIMAL 3,102,536 9/1963 Rose et al. 128/92 CA PORnON OF THE FEMUR FOREIGN PATENTS OR APPLICATIONS [76] lnvemo" Isaevlch shershe" 1 2,015,324 11/1971 Germany 3/1 g y y pr z 3, W 124,585 0/1959 U.S.S.R 128/92 c Saratov, U.S.'S.R. [22] Filed; Mar. 22, 1973 Primary Examiner-Richard A. Gaudet Assistant ExaminerRonald I. Frinks [21] Appl 344032 Attorney, Agent, or Firm-Holman. & Stern [30] Foreign Application Priority Data [57] ABSTRACT M 4, 1972 U.S.S.R 1776052 ay An endoprosthesis of the proxImal port1on of the fe- 52 us. c1. 3/1 128/92 CA wherein a head and a neck are connected with a 51 Int. Cl. A61f 1/24 Shaft by means of a threaded For this PurP"Se Field of Search'm 3H. /9 C 9 CA 2 R the proximal end Of the shaft has a broadening part, /92 9 wherein a seat for a threaded split shank fitted on the I neck base is provided about the length of the neck 56] References Cited axis. The split shank is fixed by a lock for the trochanter major. Accordingly, the latter lock is elongated 2 8] 58 iz fi PATENTS 28/ 2 CA and broadens toward the end disposed inside the shaft.

,7 ,7 eva ier 9 3064.645 11/1962 Ficat et al. 128/92 CA 1 Claim, 2 Drawing Figures ENDOPROSTIIESIS OF THE PROXIMAL PORTION OF THE FEMUR The present invention relates to artificial joints employed in intra-articular prosthetic replacement, and more particularly to an endoprosthesis of the proximal portion of the femur. Such an endoprosthesis may be employed both independently and as part of an artificial hip-joint to restore mobility in the hip-joint lost due to Bekhterevs disease, arthritis deformans, arthritis infectiosa and aceptic necrosis of the femoral neck, as well as femoral neck fractures in the aged.

Known in the art is to employ an endoprosthesis of the proximal portion of the femur, comprising a head passing into a neck and also containing a shaft with a lock for the trochanter major.

In the known endoprosthesis the head and neck are permanently connected with the shaft. Hence, if the head is worn out or the neck is fractured, the whole endoprosthesis including the shaft must be removed.

Besides, the mentioned endoprosthesis does not provide for varying the neck length depending on the individual anatomy of different patients.

It is an object of the present invention to provide an endoprosthesis of the proximal portion of the femur, wherein the head and neck would be connected with the shaft by means of a detachable joint.

This object is accomplished by providing in an endoprosthesis of the proximal portion of the femur, comprising a head passing into a neck and a shaft wherein there is fixed a lock for the trochanter major, in which, in accordance with the present invention, the head and neck are connected with the shaft by means of a threaded joint, for which purpose the proximal end of the shaft has a broadened part, wherein a seat is provided about the axis of the neck to receive a threaded split shank fixed on the base of the neck, and the lock of the trochanter major is elongated and broadens toward the end thereof disposed inside the shaft, said lock simultaneously serving as a lock for the split shank of the neck.

The disclosed endoprosthesis of the proximal portion of the femur is advantageous in the sense that the head can be replaced, if need be, without taking the shaft from the medullary canal, and also that the neck may be elongated or shortened depending on the specific anatomy of different patients.

An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, wherein:

FIG. 1 is a general view (with cut-away segments) of an endoprosthesis of the proximal portion of the femur, in accordance with the invention;

FIG. 2 is a view of asplit shank in FIG. 1 taken along the arrow A.

I The endoprosthesis of the proximal portion of the femur shown in FIG. 1 comprises a head 1 passing into a neck 2 and a shaft 3 provided with fenestras 4 wherethrough burgeoning bony tissue can advance. The proximal end of the shaft 3 has a broadened part 5, wherein a seat 7 is drilled out along an axis 6 to receive a threaded split shank 8 fixed on the base of the neck Besides, in the broadened part 5 of the shaft 3 along an intertrochanteric axis 9 there is drilled out an orifice 10 wherein there is disposed a lock for the trochanter major, the latter lock being formed as a screw 1 l, with one end thereof disposed inside the boradened part 5 being elongated and broadened. The screw 11 and the shank 8 are so disposed relative to each other that the screw 11 passing through theslit of the shank 8 serves as a lock for the shank 8, preventing the neck 2 from self-unscrewing during the service of the prosthesis.

The screw 11 is locked by two nuts 12. Besides, the broadened part 5 has an opening 13 provided for the convenience of the operating surgeon.

FIG. 2 is a view of the split shank 8 taken along the arrow A showing the shape of the slit in the shank 8.

The proposed endoprosthesis of the proximal portion of the femur is assembled in the following manner.

The neck 2 is screwed into the seat 7 (FIG. 1). The screw 11 is led into the orifice l0, narrow end first in such a way that it should pass through the slit in the shank 8. After that the screw 11 is locked with two nuts 12, in which process the screw 11 is tightened and the shank 8 is securely locked against self-unscrewing.

What is claimed is:

1. An endoprosthesis of the proximal portion of the femur, comprising a head, said head extending into a neck having a base thereon, a shaft designed for being inserted into the femoral medullary canal, said shaft having a proximal end defining a broadened part, a seat formed in said broadened part along the axis of said neck, a threaded split shank fixed on the base of said neck, a threaded joint connecting said neck with said shaft by screwing said split shank into said seat, a lock for the trochanter major having one end disposed in said broadened part of said shaft, said end of said lock for the trochanter major being elongated and broadened for the purpose of locking said split shank.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2781758 *Jan 24, 1955Feb 19, 1957Chevalier Michel JacquesArtificial femoral head
US3064645 *Jan 15, 1962Nov 20, 1962Raymond P FicatDamped prosthesis forming a substitute for the coxo-femoral articulation
US3102536 *Dec 7, 1960Sep 3, 1963Robert M RoseHip prosthesis
DE2015324A1 *Mar 31, 1970Nov 4, 1971 Title not available
SU124585A1 * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3995323 *Oct 20, 1975Dec 7, 1976Yakov Isaevich ShersherMethod of preparing bone endoprosthesis model and endoprosthesis of proximal femur prepared with the aid of said model
US4115875 *Apr 19, 1977Sep 26, 1978Andre RambertHip prosthesis
US4404691 *Feb 25, 1981Sep 20, 1983Howmedica International Inc.Modular prosthesis assembly
US4488319 *Oct 26, 1981Dec 18, 1984Clemson UniversityMethod of two-stage implantation of a joint prosthesis and prosthetic product
US4578081 *May 24, 1982Mar 25, 1986Howmedica International, Inc.Bone prosthesis
US5080685 *May 25, 1990Jan 14, 1992Boehringer Mannheim CorporationModular hip prosthesis
US5181928 *Dec 13, 1989Jan 26, 1993Boehringer Mannheim CorporationModular hip prosthesis
US5211666 *Apr 22, 1991May 18, 1993New York UniversityHip joint femoral component endoprosthesis with a lateral load-transferring support surface
US5286260 *May 29, 1992Feb 15, 1994Depuy Inc.Modular hip prosthesis
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US5342366 *Feb 19, 1992Aug 30, 1994Biomet, Inc.Surgical instruments for hip revision
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