GB2090745A - Device for treating trochanteric fracture - Google Patents

Device for treating trochanteric fracture Download PDF

Info

Publication number
GB2090745A
GB2090745A GB8200084A GB8200084A GB2090745A GB 2090745 A GB2090745 A GB 2090745A GB 8200084 A GB8200084 A GB 8200084A GB 8200084 A GB8200084 A GB 8200084A GB 2090745 A GB2090745 A GB 2090745A
Authority
GB
United Kingdom
Prior art keywords
plate
screw
lag screw
head
femur
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8200084A
Other versions
GB2090745B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HOWMEDICA UK Ltd
Original Assignee
HOWMEDICA UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HOWMEDICA UK Ltd filed Critical HOWMEDICA UK Ltd
Priority to GB8200084A priority Critical patent/GB2090745B/en
Publication of GB2090745A publication Critical patent/GB2090745A/en
Application granted granted Critical
Publication of GB2090745B publication Critical patent/GB2090745B/en
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/74—Devices for the head or neck or trochanter of the femur
    • A61B17/742—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck
    • A61B17/748—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck with means for adapting the angle between the longitudinal elements and the shaft axis of the femur
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/74—Devices for the head or neck or trochanter of the femur
    • A61B17/742—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck
    • A61B17/746—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck the longitudinal elements coupled to a plate opposite the femoral head

Abstract

A device for treatment of a trochanteric fracture of the upper femur comprises a plate, 1, for fixing to the upper part of the femur, a lag screw, 7, for connection to the head of the femur and means for rigidly securing the lag screw to the plate at different angles and for removing it from the plate the plate is fixed in position on the femur. <IMAGE>

Description

SPECIFICATION Device for use in treatment of a trochanteric fracture of the upper femur This invention relates to a device for use in treatment of a trochanteric fracture of the upper femur.
It is known in the treatment of such fractures to use a plate which is adapted to be connected to the upper part of the femur and which carries a projecting lag screw. It is necessary for the lag screw to be accurately connected to the plate at a predetermined angle to ensure that when the lag screw is screwed into the head of the femur to locate it in place the lag screw carries the bearing weight. It is therefore necessary for the lag screw to be securely located on the plate.
A difficulty with known constructions is that the angle of the lag screw is preset and if, for some reason, the screw becomes loose in the head it is necessary to remove the plate and screw before the device can be remounted on the femur with the screw at a different angle or at a different position to again accurately locate the head. Thus, the operation entails the removal of the plate as well as the screw.
The present invention is intended to provide a device from which the lag screw can be removed and repositioned in the head of the femur without removal of the plate from the bone concerned.
According to the present invention a device for use in treatment of a trochanteric fracture of the upper femur comprises a plate component adapted for fixing to the upper part of the femur to be treated and a lag screw for connection to the head of the femur and means for rigidly securing said lag screw to the plate at different angles and for removing it from the plate when said plate is fixed in position on the femur with which it is to be used.
Preferably the securing means enable the lag screw to be secured to the plate along an axis at angles in two different planes.
Again, the lag screw can be arranged to be secured at different angles in two different planes thus enabling wide range of angles and movement to be achieved.
In a preferred construction the plate is provided with an aperture through which said lag screw can pass and said securing means include a removable location member which co-operates with a head on the lag screw to prevent movement of the screw through the aperture when the removable location member is placed in position.
The head of the lag screw can be arranged to be axially adjustable in relation to the location member when in position to enable the plate to be clamped between them and thus provide the rigid connection.
Thus, the location member can be provided by a location washer which can be located behind an abutment on the lag screw, said location washer also engaging the plate.
Preferably the abutment and the washer can have co-operating serrations as can the washer and the plate.
The head can be arranged to be removable from the lag screw and thus it can be screw threaded thereto.
With this arrangement the head can have a screw threaded shank which engages in a screw threaded bore in the screw and this bore can carry means to engage a suitable tool to allow the screw to be rotated.
In a preferred embodiment the portion of the plate which carries the lag screw is dished and projects angularly in relation to the part of the plate intended for attachment to the femur. The engaging locator washer can also be dished to co-operate with it as can a flanged portion of the head.
The invention can be performed in many ways but one embodiment and one method of using the device will now be described by way of example and with reference to the accompanying drawings in which: Figure 1 is an exploded view of the various parts of the device; Figure 2 is a side elevation of the plate for use with the device; Figue 3 is a front elevation of the plate shown in Figure 2; Figure 4 is a front elevation of the location washer; and Figure 5 is a side view of the washer shown in Figure 4.
As shown in the drawings the device for use in treatment of a trochanteric fracture of the upper femur comprises a plate 1 which is adapted for fixing to the upper part of the femur to be treated. The plate comprises a shank portion 2 which is slightly camberred to adapt it to the bone and which carries five screw holes 3 to enable it to be secured in position in known fashion. The plate can be manufactured in various lengths and have any number of desired screw holes to fit various patients.
The upper end 4 of the plate 1 projects angularly in relation to the shank 1. This part of the plate is dished and carries serrations indicated by reference numeral 5. An aperture in theform of an elongated slot 6 is provided in the dished portion of the plate and is wider than the largest dimensions of a lag screw 7. This lag screw has a tapered screw thread 8 at one end and is provided with a boss 9 at the other end. This boss 9 has a bore 10 which carries a screw thread 11 and has a hexagonal socket 12 to receive an allen key in a manner to be described. The end of the boss 9 acts as an abutment and is serrated as indicated by reference numeral 13.
Means for rigidly securing the lag screw to the plate comprise a removable location member in the form of a location washer 15 which is dished and which has serrations 16 which can co-operate with serrations 13 on the abutment end of the lag screw and parallel serrations 17 on its other side which can co-operate with serrations 5 on the plate 1.
A removable bolt head 21 comprises a head 18 of hexagonal shape to receive a spanner, a dished flange 19 rigidly secured thereto and a screw threaded shank 20.
When the device is to be used the plate 1 is rigidly secured to the femoral shaft by suitable screws passing through the holes 3. The lag screw is now passed through the slot 6 and located in the head of the femur in known manner and by rotating itwith an allen key located in the hexagonal socket 12. It will be appreciated that the screw can be passed through the slot 6 at various angles in different planes to achieve the best location position. The bolt head 21 is now screw threaded into the bore 10 but prior to insertion the washer 15 is located on the shank 20 of the head so that it nests with its serrations 17 against the serrations Son the plate.
Further tightening of the head now pulls the serrations 13 against the serrations 16 on the washer and the head is finally tightened, the engaging serrations assuring that the angle of the lag screw is fixed and the screw is rigidly secured to the plate.
In order to assist handling of the washer a small lug 21 with a hole 22 is provided. This projecting lug enables the washer to be held by an appropriate instrument when it is inserted or removed during use of the device.
The flange 19 of the bolt head 21 fits the curve of the dished outer surface of the part 4 of the plate and the shank 20 may have a nylock self-retaining device to prevent the head unfastening.
As the lag screw 7 and the plate are rigidly held together the loading on the bone is all carried through the lag screw and the plate which thus helps prevent displacement of the fracture.
Should the lag screw displace within the bone or penetrate the femoral head and thus impinge on the acetabulum during movement of the hip it is possible to reposition it without disturbing the plate which is firmly screwed to the upper part of the femur.
Thus, the lag screw 7 can be removed through the slot 6 once the head 17 has been loosened and the dish shaped washer 15 removed. Thus, a revision operation is a much less serious operation both from the patient's and the surgeon's point of view than it would be if the plate had to be completely unscrewed from the femur and the whole device repositioned as is normal with conventional nail plate fixation systems.
Once the lag screw has been removed it can be repositioned in the head to the femur and again fastened up in the manner described above. Thus, a whole range of positions in both plane can be achieved or altered without disturbing the plate.

Claims (14)

1. A device for use in treatment of a trochanteric fracture of the upper femur comprising a plate component adapted for fixing to the upper part of the femur to be treated, a lag screw for connection to the head of the femur and means for rigidly securing said lag screw to the plate at different angles and for removing it from the plate when said plate is fixed in position on the femur with which it is to be used.
2. A device as claimed in claim 1 in which said securing means enables the lag screw to be secured to the plate along an axis at angles in two different planes.
3. A device as claimed in claim 2 in which said lag screw can be secured at different angles in two different planes.
4. A device as claimed in claims 1-3 in which said plate is provided with an aperture through which said lag screw can pass and said securing means includes a removable location member which cooperates with a head on said lag screw to prevent movement of the screw through the aperture when it is placed in position.
5. A device as claimed in claim 4 in which the head of said lag screw is axially adjustable in relation to said location member when in position to enable said plate to be clamped between them.
6. A device as claimed in claim 5 in which location member is in the form of a location washer which can be located behind an abutment on the lag screw, said location washer also engaging the plate.
7. A device as claimed in claim 5, 6 or 7 in which said abutment and said washer have co-operating serrations.
8. A device as claimed in claim 5, 6 or 7 in which said washer and said plate have co-operating serrations.
9. A device as claimed in claim 5,6,7 or 8 in which said head is removable from said lag screw.
10. A device as claimed in claim 9 in which said head is screw threaded to said lag screw.
11. A device as claimed in claim 10 in which said head has a screw threaded shank which engages in a screw threaded bore in the screw, said bore carrying means to engage a suitable tool to allow the screw to be rotated.
12. A device as claimed in any one of the preceding claims in which the portion of the plate which carries the lag screw is dished and projects angularly in relation to the part of the plate intended for attachment to the femur.
13. A device as claimed in claim 12 in which the location washer is also dished as is a flanged portion of said head.
14. A device for use in treatment of a trochanteric fracture of the upperfemure substantially as described herein with reference to and as shown in the accompanying drawings.
GB8200084A 1981-01-09 1982-01-04 Device for treating trochanteric fracture Expired GB2090745B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8200084A GB2090745B (en) 1981-01-09 1982-01-04 Device for treating trochanteric fracture

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8100610 1981-01-09
GB8200084A GB2090745B (en) 1981-01-09 1982-01-04 Device for treating trochanteric fracture

Publications (2)

Publication Number Publication Date
GB2090745A true GB2090745A (en) 1982-07-21
GB2090745B GB2090745B (en) 1984-05-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8200084A Expired GB2090745B (en) 1981-01-09 1982-01-04 Device for treating trochanteric fracture

Country Status (1)

Country Link
GB (1) GB2090745B (en)

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4944615A (en) * 1986-04-07 1990-07-31 Brother Kogyo Kabushiki Kaisha Permanent magnet print head assembly with a square magnet
US4973332A (en) * 1988-09-12 1990-11-27 Hospital For Joint Diseases Attachment for femur sliding screw plate
US5120171A (en) * 1990-11-27 1992-06-09 Stuart Surgical Bone screw with improved threads
US5226766A (en) * 1990-11-27 1993-07-13 Stuart Surgical Bone screw with improved threads
EP0551588A1 (en) * 1992-01-14 1993-07-21 Howmedica GmbH Intramedullary nail for treating fractures of the proximal femur
WO1993015697A1 (en) * 1992-02-18 1993-08-19 Danek Medical, Inc. Variable angle screw for spinal implant system
US5330536A (en) * 1987-09-18 1994-07-19 Howmedica Gmbh Femur portion of a hip
US5492442A (en) * 1990-11-27 1996-02-20 National Medical Specialty, Inc. Bone screw with improved threads
US5549607A (en) * 1993-02-19 1996-08-27 Alphatec Manufacturing, Inc, Apparatus for spinal fixation system
US5611800A (en) * 1994-02-15 1997-03-18 Alphatec Manufacturing, Inc. Spinal fixation system
US5634925A (en) * 1993-02-19 1997-06-03 Alphatec Manufacturing, Inc. Apparatus and method for spinal fixation system
US5693053A (en) * 1995-10-19 1997-12-02 Sdgi Holdings, Inc. Variable angle and transitional linking member
US6004322A (en) * 1994-10-25 1999-12-21 Sdgi Holdings, Inc. Modular pedicle screw system
GR1003504B (en) * 1999-04-26 2001-01-03 System for nailing fractures of the upper end of the femur with a comprehensive sliding nail ability to adjust the valgus and retrocollis angles
US6176861B1 (en) 1994-10-25 2001-01-23 Sdgi Holdings, Inc. Modular spinal system
US6224606B1 (en) * 1998-05-13 2001-05-01 K. K. Hollyx Bone jointer and a bone jointer fixing tool
WO2002089684A1 (en) * 2001-05-08 2002-11-14 Henrik Hansson 'implant'
WO2003024345A1 (en) * 2001-09-21 2003-03-27 Poon-Ung Chieng A device for protecting femoral neck
WO2005094707A2 (en) * 2004-03-26 2005-10-13 Smith & Nephew, Inc. Methods for treating fractures of the femur and femoral fracture devices
US7229445B2 (en) 2004-06-21 2007-06-12 Synthes (Usa) Bone plate with bladed portion
US7951176B2 (en) 2003-05-30 2011-05-31 Synthes Usa, Llc Bone plate
US8926611B2 (en) 2009-09-14 2015-01-06 Zimmer Gmbh Angular lag implant for intramedullary nails
US10335211B2 (en) 2004-01-26 2019-07-02 DePuy Synthes Products, Inc. Highly-versatile variable-angle bone plate system
US10342586B2 (en) 2003-08-26 2019-07-09 DePuy Synthes Products, Inc. Bone plate
US10624686B2 (en) 2016-09-08 2020-04-21 DePuy Synthes Products, Inc. Variable angel bone plate
US10772665B2 (en) 2018-03-29 2020-09-15 DePuy Synthes Products, Inc. Locking structures for affixing bone anchors to a bone plate, and related systems and methods
US10820930B2 (en) 2016-09-08 2020-11-03 DePuy Synthes Products, Inc. Variable angle bone plate
US10905476B2 (en) 2016-09-08 2021-02-02 DePuy Synthes Products, Inc. Variable angle bone plate
US10925651B2 (en) 2018-12-21 2021-02-23 DePuy Synthes Products, Inc. Implant having locking holes with collection cavity for shavings
US11013541B2 (en) 2018-04-30 2021-05-25 DePuy Synthes Products, Inc. Threaded locking structures for affixing bone anchors to a bone plate, and related systems and methods
US11026727B2 (en) 2018-03-20 2021-06-08 DePuy Synthes Products, Inc. Bone plate with form-fitting variable-angle locking hole
US11259851B2 (en) 2003-08-26 2022-03-01 DePuy Synthes Products, Inc. Bone plate
US11291484B2 (en) 2004-01-26 2022-04-05 DePuy Synthes Products, Inc. Highly-versatile variable-angle bone plate system

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4944615A (en) * 1986-04-07 1990-07-31 Brother Kogyo Kabushiki Kaisha Permanent magnet print head assembly with a square magnet
US5330536A (en) * 1987-09-18 1994-07-19 Howmedica Gmbh Femur portion of a hip
US4973332A (en) * 1988-09-12 1990-11-27 Hospital For Joint Diseases Attachment for femur sliding screw plate
US5417533A (en) * 1990-07-13 1995-05-23 National Medical Specialty, Inc. Bone screw with improved threads
US5120171A (en) * 1990-11-27 1992-06-09 Stuart Surgical Bone screw with improved threads
US5226766A (en) * 1990-11-27 1993-07-13 Stuart Surgical Bone screw with improved threads
US5492442A (en) * 1990-11-27 1996-02-20 National Medical Specialty, Inc. Bone screw with improved threads
EP0551588A1 (en) * 1992-01-14 1993-07-21 Howmedica GmbH Intramedullary nail for treating fractures of the proximal femur
AU656061B2 (en) * 1992-02-18 1995-01-19 Warsaw Orthopedic, Inc. Variable angle screw for spinal implant system
US5261909A (en) * 1992-02-18 1993-11-16 Danek Medical, Inc. Variable angle screw for spinal implant system
WO1993015697A1 (en) * 1992-02-18 1993-08-19 Danek Medical, Inc. Variable angle screw for spinal implant system
US5549607A (en) * 1993-02-19 1996-08-27 Alphatec Manufacturing, Inc, Apparatus for spinal fixation system
US5634925A (en) * 1993-02-19 1997-06-03 Alphatec Manufacturing, Inc. Apparatus and method for spinal fixation system
US5611800A (en) * 1994-02-15 1997-03-18 Alphatec Manufacturing, Inc. Spinal fixation system
US6379357B1 (en) 1994-10-25 2002-04-30 Sdgi Holdings, Inc. Modular spinal system
US6004322A (en) * 1994-10-25 1999-12-21 Sdgi Holdings, Inc. Modular pedicle screw system
US6176861B1 (en) 1994-10-25 2001-01-23 Sdgi Holdings, Inc. Modular spinal system
US5693053A (en) * 1995-10-19 1997-12-02 Sdgi Holdings, Inc. Variable angle and transitional linking member
US6224606B1 (en) * 1998-05-13 2001-05-01 K. K. Hollyx Bone jointer and a bone jointer fixing tool
GR1003504B (en) * 1999-04-26 2001-01-03 System for nailing fractures of the upper end of the femur with a comprehensive sliding nail ability to adjust the valgus and retrocollis angles
WO2002089684A1 (en) * 2001-05-08 2002-11-14 Henrik Hansson 'implant'
WO2003024345A1 (en) * 2001-09-21 2003-03-27 Poon-Ung Chieng A device for protecting femoral neck
US7458990B2 (en) 2001-09-21 2008-12-02 Poon-Ung Chieng Device for protecting femoral neck
US11419647B2 (en) 2003-05-30 2022-08-23 DePuy Synthes Products, Inc. Bone plate
US7951176B2 (en) 2003-05-30 2011-05-31 Synthes Usa, Llc Bone plate
US10653466B2 (en) 2003-05-30 2020-05-19 DePuy Synthes Products, Inc. Bone plate
US9931148B2 (en) 2003-05-30 2018-04-03 DePuy Synthes Products, Inc. Bone plate
US10231768B2 (en) 2003-05-30 2019-03-19 DePuy Synthes Products, Inc. Methods for implanting bone plates
US10342586B2 (en) 2003-08-26 2019-07-09 DePuy Synthes Products, Inc. Bone plate
US11259851B2 (en) 2003-08-26 2022-03-01 DePuy Synthes Products, Inc. Bone plate
US11291484B2 (en) 2004-01-26 2022-04-05 DePuy Synthes Products, Inc. Highly-versatile variable-angle bone plate system
US10335211B2 (en) 2004-01-26 2019-07-02 DePuy Synthes Products, Inc. Highly-versatile variable-angle bone plate system
WO2005094707A2 (en) * 2004-03-26 2005-10-13 Smith & Nephew, Inc. Methods for treating fractures of the femur and femoral fracture devices
US7972336B2 (en) 2004-03-26 2011-07-05 Smith & Nephew, Inc. Methods for treating fractures of the femur and femoral fracture devices
WO2005094707A3 (en) * 2004-03-26 2006-04-20 Smith & Nephew Inc Methods for treating fractures of the femur and femoral fracture devices
US7229445B2 (en) 2004-06-21 2007-06-12 Synthes (Usa) Bone plate with bladed portion
US8926611B2 (en) 2009-09-14 2015-01-06 Zimmer Gmbh Angular lag implant for intramedullary nails
US10624686B2 (en) 2016-09-08 2020-04-21 DePuy Synthes Products, Inc. Variable angel bone plate
US10820930B2 (en) 2016-09-08 2020-11-03 DePuy Synthes Products, Inc. Variable angle bone plate
US10905476B2 (en) 2016-09-08 2021-02-02 DePuy Synthes Products, Inc. Variable angle bone plate
US11529176B2 (en) 2016-09-08 2022-12-20 DePuy Synthes Products, Inc. Variable angle bone plate
US11026727B2 (en) 2018-03-20 2021-06-08 DePuy Synthes Products, Inc. Bone plate with form-fitting variable-angle locking hole
US10772665B2 (en) 2018-03-29 2020-09-15 DePuy Synthes Products, Inc. Locking structures for affixing bone anchors to a bone plate, and related systems and methods
US11013541B2 (en) 2018-04-30 2021-05-25 DePuy Synthes Products, Inc. Threaded locking structures for affixing bone anchors to a bone plate, and related systems and methods
US10925651B2 (en) 2018-12-21 2021-02-23 DePuy Synthes Products, Inc. Implant having locking holes with collection cavity for shavings

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