CA2676807A1 - Hip fracture device with barrel and end cap for load control - Google Patents

Hip fracture device with barrel and end cap for load control Download PDF

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Publication number
CA2676807A1
CA2676807A1 CA002676807A CA2676807A CA2676807A1 CA 2676807 A1 CA2676807 A1 CA 2676807A1 CA 002676807 A CA002676807 A CA 002676807A CA 2676807 A CA2676807 A CA 2676807A CA 2676807 A1 CA2676807 A1 CA 2676807A1
Authority
CA
Canada
Prior art keywords
screw
end cap
friction pin
barrel
plate
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
CA002676807A
Other languages
French (fr)
Other versions
CA2676807C (en
Inventor
Bernd Simon
Jakob Kemper
Carsten Hoffmann
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.)
Stryker Trauma GmbH
Original Assignee
Stryker Trauma Gmbh
Bernd Simon
Jakob Kemper
Carsten Hoffmann
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 Stryker Trauma Gmbh, Bernd Simon, Jakob Kemper, Carsten Hoffmann filed Critical Stryker Trauma Gmbh
Publication of CA2676807A1 publication Critical patent/CA2676807A1/en
Application granted granted Critical
Publication of CA2676807C publication Critical patent/CA2676807C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831—Material properties
    • A61B2017/00858—Material properties high friction, non-slip

Abstract

A hip fracture device providing distance limited dynamization, load controlled dynamization and combinations of both dynamization methods by varying components. The hip fracture device includes a plate having a head portion and a shaft portion. A barrel projects from the head portion of the plate and a screw is inserted in the barrel. A friction pin is slidably connected with the screw, and an end cap is fixed to the head portion of the plate. The friction pin is fixedly connected with the end cap. The screw slides over the friction pin and toward the end cap when a load is applied on the fracture device. The load required for further sliding of the screw over the friction pin increases incrementally as the screw slides towards the end cap.

Claims (19)

1. A hip fracture device comprising:
a plate (11), the plate having a head portion and a shaft portion (3);
a barrel (41) projecting from the head portion of the plate;
a screw (33) inserted in the barrel;
a friction pin (61) slidably connected with the screw; and an end cap (51) fixed to the head portion of the plate, wherein the friction pin is fixedly connected with the end cap, and the screw slides over the friction pin and toward the end cap when a load is applied on the fracture device.
2. The device of claim 1, wherein the load required for further sliding of the screw over the friction pin increases incrementally as the screw slides towards the end cap.
3. The device of any of claims 1 and 2, wherein the friction pin comprises:
a tubular body (65); and a slit (67) formed in the tubular body.
4. The device of any of claims 1 to 3, wherein the end cap comprises:
a head (52); and a shaft (55) projecting from the head, the shaft having a blind bore (57) sized to form a press fit with the external surface of the friction pin.
5. The device of claim 4, further comprising:
first threads (53) formed on the head (52); and second threads (53) formed in a bore (17) in the head portion of the plate (11), the first and the second threads configured to mate, thereby fixing the end cap (51) to the plate (11).
6. The device of any of claims 4 and 5, wherein the maximum length of travel of the screw (33) toward the end cap (51) is inversely proportional to the length of the shaft (55) projecting from the head (52).
7. The device of any of claims 4 to 6, wherein the screw further comprises a flange (38) and the barrel (41) comprises a shoulder, and the flange rests against the shoulder when the screw is at the farthest distance possible from the end cap.
8. The device of any of claims 1 to 7, wherein rotating the screw (33) when the flange (38) is resting against the shoulder pulls a femoral head fragment towards a femur to close a gap between them.
9. The device of any of claims 1 to 8, further comprising;
a second and a third barrel (41) projecting from the head of the plate (11);
a second screw (33) inserted in the second barrel and a third screw (33) inserted in the third barrel;
a second friction pin (61) slidably connected with the second screw and a third friction pin (61) slidably connected with the third screw; and a second and a third end caps (51) fixed to the head portion of the plate (11), wherein the second friction pin is fixedly connected with the second end cap and the third friction pin is fixedly connected with the third end cap, and the second and the third screws slide over the second and the third friction pins respectively and toward the end cap when a load is applied on the fracture device.
10. The device of claim 9, wherein the load required for further sliding of the screw (33), the second screw (33) and the third screw (33) over the friction pin (61), the second friction pin (61) and the third friction pin (61) respectively increases incrementally as the screws slide towards the respective end caps (51).
11. The device of any of claims 9 and 10, wherein the friction pin (61) is of different diameter as compared to the second friction pin (61) and the third friction pin (61).
12. A method of applying a hip fracture device for repairing a fracture between the head and neck of a femur comprising:
affixing a plate having a head portion and a shaft portion, the plate having openings in the head portion and the shaft portion;
inserting a barrel in the opening in the head portion;
inserting a screw in the barrel;
inserting an end cap in the opening having the barrel inserted therein;
inserting a friction pin between the end cap and the screw, such that the screw can slide over the friction pin and towards the end cap, and the load required for further sliding of the screw over the friction pin increases incrementally as the screw slides towards the end cap.
13. The method of claim 12, wherein affixing comprises affixing on the femur.
14. The method of any of claims 12 and 13, further comprising:
changing the load required for axial movement of the screw towards the end cap by selecting a friction pin of different size.
15. The method of any of claims 12 to 14, further comprising:
inserting a second barrel in a second opening in the head portion;
inserting a screw in the second barrel;
inserting a second end cap in the second opening; and inserting a second friction pin between the end cap and the screw.
16. The method of claim 15, wherein the second friction pin is the same size as the friction pin.
17. The method of claim 15, wherein the second friction pin is a different size from the friction pin.
18. The method of claim 15, wherein the first and the second pin are same length.
19. A kit for repairing a fracture between the head and neck of a femur comprising:
at least one plate (11), the plate having a head portion and a shaft portion (3), and openings (13, 17) formed in the head portion and the shaft portion (3);
at least one barrel (41) configured for insertion in the opening in the head portion;
at least two screws (33) each having a central bore (37), each bore having a different diameter;
at least two friction pins (61), each pin having an external diameter that matches the diameter of one of the central bore (37) in one of the screw; and at least two end caps (51), each end cap having a first bore (57) that matches the diameter of one of the friction pins.
CA2676807A 2007-04-19 2008-04-11 Hip fracture device with barrel and end cap for load control Expired - Fee Related CA2676807C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US92539907P 2007-04-19 2007-04-19
US60/925,399 2007-04-19
PCT/EP2008/002892 WO2008128662A1 (en) 2007-04-19 2008-04-11 Hip fracture device with barrel and end cap for load control

Publications (2)

Publication Number Publication Date
CA2676807A1 true CA2676807A1 (en) 2008-10-30
CA2676807C CA2676807C (en) 2012-07-03

Family

ID=39679726

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2676807A Expired - Fee Related CA2676807C (en) 2007-04-19 2008-04-11 Hip fracture device with barrel and end cap for load control

Country Status (8)

Country Link
US (1) US8398636B2 (en)
EP (1) EP2134278B1 (en)
JP (1) JP5037677B2 (en)
CN (1) CN101631505B (en)
AU (1) AU2008241022B2 (en)
CA (1) CA2676807C (en)
ES (1) ES2393679T3 (en)
WO (1) WO2008128662A1 (en)

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AU2008241022B2 (en) 2011-03-10
WO2008128662A1 (en) 2008-10-30
CN101631505A (en) 2010-01-20
US20080269752A1 (en) 2008-10-30
US8398636B2 (en) 2013-03-19
EP2134278A1 (en) 2009-12-23
CA2676807C (en) 2012-07-03
AU2008241022A1 (en) 2008-10-30
CN101631505B (en) 2011-11-23
ES2393679T3 (en) 2012-12-27
JP2010523295A (en) 2010-07-15
EP2134278B1 (en) 2012-08-22
JP5037677B2 (en) 2012-10-03

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