US3806957A - Endoprosthesis of the proximal portion of the femur - Google Patents

Endoprosthesis of the proximal portion of the femur Download PDF

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Publication number
US3806957A
US3806957A US00344032A US34403273A US3806957A US 3806957 A US3806957 A US 3806957A US 00344032 A US00344032 A US 00344032A US 34403273 A US34403273 A US 34403273A US 3806957 A US3806957 A US 3806957A
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neck
shaft
endoprosthesis
femur
lock
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US00344032A
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Y Shersher
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0026—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in surface structures

Definitions

  • 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.
  • 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.
  • 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.
  • the mentioned endoprosthesis does not provide for varying the neck length depending on the individual anatomy of different patients.
  • 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.
  • 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.
  • 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
  • an orifice 10 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-un
  • the screw 11 is locked by two nuts 12.
  • 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.
  • 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.

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.

Description

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.

Claims (1)

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.
US00344032A 1972-05-04 1973-03-22 Endoprosthesis of the proximal portion of the femur Expired - Lifetime US3806957A (en)

Applications Claiming Priority (1)

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SU7201776052A SU440014A1 (en) 1972-05-04 1972-05-04 Endoprosthesis of proximal end of thighbone

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US3806957A true US3806957A (en) 1974-04-30

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DE (1) DE2320683A1 (en)
FR (1) FR2183230B1 (en)
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IT (1) IT987053B (en)
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SU (1) SU440014A1 (en)

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US3995323A (en) * 1974-10-31 1976-12-07 Yakov Isaevich Shersher Method of preparing bone endoprosthesis model and endoprosthesis of proximal femur prepared with the aid of said model
US4115875A (en) * 1976-04-26 1978-09-26 Andre Rambert Hip prosthesis
US4404691A (en) * 1980-03-11 1983-09-20 Howmedica International Inc. Modular prosthesis assembly
US4488319A (en) * 1981-10-26 1984-12-18 Clemson University Method of two-stage implantation of a joint prosthesis and prosthetic product
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US5080685A (en) * 1986-08-15 1992-01-14 Boehringer Mannheim Corporation Modular hip prosthesis
US5211666A (en) * 1991-04-22 1993-05-18 New York University Hip joint femoral component endoprosthesis with a lateral load-transferring support surface
US5800553A (en) * 1991-07-23 1998-09-01 Aktiebolaget Astra Hip joint prosthesis to be permanently anchored within a femur of a patient
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US5370698A (en) * 1992-04-16 1994-12-06 Clemson University Isoelastic implants with improved anchorage means
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US8110005B2 (en) 2000-04-10 2012-02-07 Biomet Manufacturing Corp. Modular prosthesis and use thereof for replacing a radial head
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US8535382B2 (en) 2000-04-10 2013-09-17 Biomet Manufacturing, Llc Modular radial head prostheses
US20110144759A1 (en) * 2000-04-10 2011-06-16 Biomet Manufacturing Corp. Modular prosthesis and use thereof for replacing a radial head
US20110125276A1 (en) * 2000-04-10 2011-05-26 Biomet Manufacturing Corp. Modular prosthesis and use thereof for replacing a radial head
US9579208B2 (en) 2000-04-10 2017-02-28 Biomet Manufacturing, Llc Modular radial head prosthesis
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US20100312349A1 (en) * 2000-04-10 2010-12-09 Biomet Manufacturing Corp. Modular prosthesis and use thereof for replacing a radial head
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US6440171B1 (en) 2001-02-27 2002-08-27 Hammill Manuf. Co. Double D key locking prosthesis
US8241367B2 (en) 2002-04-25 2012-08-14 Zimmer, Inc. Modular bone implant, tool, and method
US6875239B2 (en) 2002-04-25 2005-04-05 Medicinelodge, Inc. Modular prosthesis for replacing bone and method
US20030204268A1 (en) * 2002-04-25 2003-10-30 Medicinelodge, Inc. Binary attachment mechanism and method for a modular prosthesis
US6902583B2 (en) 2002-04-25 2005-06-07 Medicinelodge, Inc. Tripartite attachment mechanism and method for a modular prosthesis
US20030204266A1 (en) * 2002-04-25 2003-10-30 Medicinelodge, Inc. Modular prosthesis for replacing bone and method
US7857858B2 (en) 2002-04-25 2010-12-28 Zimmer Technology, Inc. Modular bone implant, tool, and method
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SE7306217L (en) 1973-11-05
FR2183230A1 (en) 1973-12-14
DE2320683A1 (en) 1973-11-15
IT987053B (en) 1975-02-20
FR2183230B1 (en) 1976-06-11
CH551784A (en) 1974-07-31
GB1418757A (en) 1975-12-24
SU440014A1 (en) 1978-08-05

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