DE10337672A1 - Hollow bone screw used in surgical interventions to join two bones comprises a shaft, an external thread section on the periphery of the shaft, and a non-circular channel extending through the shaft - Google Patents

Hollow bone screw used in surgical interventions to join two bones comprises a shaft, an external thread section on the periphery of the shaft, and a non-circular channel extending through the shaft Download PDF

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Publication number
DE10337672A1
DE10337672A1 DE2003137672 DE10337672A DE10337672A1 DE 10337672 A1 DE10337672 A1 DE 10337672A1 DE 2003137672 DE2003137672 DE 2003137672 DE 10337672 A DE10337672 A DE 10337672A DE 10337672 A1 DE10337672 A1 DE 10337672A1
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DE
Germany
Prior art keywords
shaft
external thread
periphery
bone screw
thread section
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
DE2003137672
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German (de)
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DE10337672B4 (en
Inventor
Karl-Heinz Otto
Thomas Dr. Ebel
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.)
Tricumed Medizintechnik GmbH
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Tricumed Medizintechnik GmbH
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Publication date
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Priority to DE2003137672 priority Critical patent/DE10337672B4/en
Publication of DE10337672A1 publication Critical patent/DE10337672A1/en
Application granted granted Critical
Publication of DE10337672B4 publication Critical patent/DE10337672B4/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/02—Inorganic materials
    • A61L27/04—Metals or alloys
    • A61L27/06—Titanium or titanium alloys
    • 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
    • A61B17/8625—Shanks, i.e. parts contacting bone tissue
    • A61B17/8635—Tips of screws
    • 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
    • A61B17/8645—Headless screws, e.g. ligament interference screws
    • 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
    • A61B17/866—Material or manufacture

Abstract

Hollow bone screw comprises a shaft (10), at least one external thread section (12) on the periphery of the shaft, and a non-circular channel (14) extending through the shaft. Preferred Features: The channel has a hexagonal cross-section. The screw is made of a pulverized and sintered titanium alloy.

Description

Die Erfindung betrifft eine Knochenhohlschraube, also ein mit einem Außengewinde versehenes, im Rahmen eines chirurgischen Eingriffs am Menschen eingesetztes, zur Verbindung von zwei Knochen miteinander oder zur Befestigung eines Bauteils an einem Knochen in den Knochen einzuschraubendes Element.The The invention relates to a bone hollow screw, ie one with a external thread provided in the context of a surgical procedure on humans used to connect two bones with each other or to Attaching a component to a bone screwed into the bone Element.

Aus der DE 28 07 364 C2 ist eine Knochenhohlschraube mit den Merkmalen des Oberbegriffs des Anspruchs 1 bekannt. Diese ist mit einem zentralen Kanal versehen, der zur Aufnahme eines Führungsdrahts dienen, aber auch zur Applikation eines Medikaments dienen kann.From the DE 28 07 364 C2 a bone hollow screw with the features of the preamble of claim 1 is known. This is provided with a central channel, which serve to receive a guide wire, but can also serve for the application of a drug.

Dabei ist der sich zentral durch den Schaft erstreckende Kanal im Querschnitt rund ausgebildet.there is the channel extending centrally through the shaft in cross section trained around.

Bei derartigen Knochenhohlschrauben stellt sich das Problem, dass diese meist selbstschneidend ausgebildet, also mit einem erheblichen Kraftaufwand in den Knochen einzuschrauben sind, wobei bei der Betätigung nur am Schraubenkopf in dem Schaft der Schraube erhebliche Scherkräfte auftreten. Weiter stellt sich das Problem, dass bei einem Bruch der Schraube der distale Teil der Schraube nicht auf einfache Weise wieder aus dem Knochen entfernt werden kann.at Such hollow screws, the problem is that these usually designed self-tapping, so with a considerable effort to screw in bones, and at operation only significant shear forces occur at the screw head in the shank of the screw. Next, the problem arises that at a breakage of the screw The distal part of the screw can not be easily removed the bone can be removed.

Aus der EP 1 119 429 B1 ist es bekannt, in den menschlichen Körper zu implantierende, aus einer Titanlegierung bestehende Bauelemente durch ein Metallspritzgussverfahren herzustellen.From the EP 1 119 429 B1 It is known to produce in the human body to be implanted, consisting of a titanium alloy components by a metal injection molding process.

Der Erfindung liegt die Aufgabe zugrunde, eine Knochenhohlschraube zu schaffen, bei der bei dem Einschrauben das Auftreten erheblicher Scherkräfte vermieden werden kann und bei dem ein Ausschrauben des distalen Teiles der Schraube bei einem Bruch möglich ist.Of the Invention is based on the object, a bone hollow screw create, when screwing the occurrence of considerable shear can be avoided and in which a unscrewing of the distal Part of the screw in a break is possible.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruchs 1 gelöst, die Unteransprüche geben vorteilhafte Ausgestaltungen der Erfindung an.According to the invention this Problem solved by the features of claim 1, the dependent claims advantageous embodiments of the invention.

Die Erfindung wird im folgenden anhand einer Zeichnung erläutert. deren 1 eine Knochenschraube in einem Längsschnitt und deren Fig. die Knochenhohlschraube in einem Querschnitt wiedergibt.The invention will be explained below with reference to a drawing. their 1 a bone screw in a longitudinal section and their Fig. The bone hollow screw reproduces in a cross section.

Die Knochenhohlschraube besteht aus einem Schaft 10, wenigstens einem um den Schaft 10 umlaufenden Außengewindeabschnitt 12 und einem sich zentral durch den Schaft 10 erstreckenden Kanal 14. Der Kanal 14 ist im Querschnitt sechskantig, was das Ein- und Auschrau ben der Schraube mit einem zu dem Innenquerschnitt des Kanals komplementär ausgebildeten Werkzeug (einem Inbusschlüssel) erlaubt, was eine Krafteinleitung über die gesamte Länge des Schafts 10 und damit ein Vermeiden übergroßer Scherkräfte erlaubt.The bone hollow screw consists of a shaft 10 , at least one around the shaft 10 circumferential external thread section 12 and one centrally through the shaft 10 extending channel 14 , The channel 14 is hexagonal in cross-section, which allows the screwing in and out of the screw with a complementary to the inner cross section of the channel formed tool (an Allen wrench), resulting in an introduction of force over the entire length of the shaft 10 and thus avoiding excessive shear forces.

Bei Bruch des Schafts 10 der Schraube (etwa bei einer durch einen Unfall bewirkten Verschiebung der durch die Schraube miteinander verbundenen Knochen) bildet der unrund, vorzugsweise sechskantig ausgebildete Kanal 14 auch des distalen Teils der Schraube eine Angriffsfläche für ein Werkzeug und erlaubt so eine Herausschrauben aus dem Knochen.At breakage of the shaft 10 the screw (approximately in a caused by an accident displacement of the interconnected by the screw bone) forms the non-circular, preferably hexagonal channel formed 14 Also, the distal part of the screw an attack surface for a tool, allowing a unscrewing from the bone.

Die erfindungsgemäße Knochenhohlschraube besteht vorzugsweise aus einer durch Pulverisieren, Spritzgießen und Sintern geformten Titanlegierung, einem Verfahren, wie es beispielsweise in der EP 1 119 429 B1 beschrieben ist. Dieses Verfahren erlaubt die Formung auch komplexer Bauteile aus einem bio-verträglichen Werkstoff mit hoher Festigkeit, die insbesondere auch die unrunde Ausbildung des Kanals im Inneren des Schafts relativ problemlos ermöglicht.The hollow bone screw according to the invention preferably consists of a titanium alloy formed by pulverization, injection molding and sintering, a process as described, for example, in US Pat EP 1 119 429 B1 is described. This method allows the formation of even complex components made of a bio-compatible material with high strength, which allows in particular the non-circular formation of the channel inside the shaft relatively easily.

Claims (4)

l. Knochenhohlschraube mit einem Schaft (10), wenigstens einem um den Schaft (10) umlaufenden Außengewindeabschnitt (12) und einem sich zentral durch den Schaft (12) erstreckenden Kanal (14), dadurch gekennzeichnet, dass der Kanal (14) im Querschnitt unrund ist.l. Bone hollow screw with a shank ( 10 ), at least one around the shaft ( 10 ) circumferential male threaded portion ( 12 ) and one centrally through the shaft ( 12 ) extending channel ( 14 ), characterized in that the channel ( 14 ) is non-circular in cross-section. Knochenhohlschraube nach Anspruch 1, dadurch gekennzeichnet, dass der Kanal (14) im Querschnitt sechskantig ist.Bone hollow screw according to claim 1, characterized in that the channel ( 14 ) is hexagonal in cross section. Knochenhohlschraube nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sie aus einem pulverisierten und sodann gesinterten Material besteht.Bone hollow screw according to claim 1 or 2, characterized characterized in that they are made of a powdered and then sintered Material exists. Knochenhohlschraube nach Anspruch 3, dadurch gekennzeichnet, dass das Material eine Titanlegierung ist.Bone hollow screw according to claim 3, characterized that the material is a titanium alloy.
DE2003137672 2003-08-16 2003-08-16 Bone hollow screw Expired - Fee Related DE10337672B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2003137672 DE10337672B4 (en) 2003-08-16 2003-08-16 Bone hollow screw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2003137672 DE10337672B4 (en) 2003-08-16 2003-08-16 Bone hollow screw

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DE10337672A1 true DE10337672A1 (en) 2005-03-17
DE10337672B4 DE10337672B4 (en) 2006-05-04

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DE2003137672 Expired - Fee Related DE10337672B4 (en) 2003-08-16 2003-08-16 Bone hollow screw

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2807364C2 (en) * 1977-02-24 1988-01-07 Interfix Ltd., Hongkong, Hk
EP0407434B1 (en) * 1988-04-02 1993-09-22 Aesculap Ag Bone screw
US6283973B1 (en) * 1998-12-30 2001-09-04 Depuy Orthopaedics, Inc. Strength fixation device
EP1119429B1 (en) * 1998-07-29 2003-07-02 Gkss-Forschungszentrum Geesthacht Gmbh Method for producing components by metallic powder injection moulding

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2807364C2 (en) * 1977-02-24 1988-01-07 Interfix Ltd., Hongkong, Hk
EP0407434B1 (en) * 1988-04-02 1993-09-22 Aesculap Ag Bone screw
EP1119429B1 (en) * 1998-07-29 2003-07-02 Gkss-Forschungszentrum Geesthacht Gmbh Method for producing components by metallic powder injection moulding
US6283973B1 (en) * 1998-12-30 2001-09-04 Depuy Orthopaedics, Inc. Strength fixation device

Also Published As

Publication number Publication date
DE10337672B4 (en) 2006-05-04

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Effective date: 20110301