DE202005020738U1 - Screw for fixing an implant, comprises a threaded section with a tool holder, a second section, and a third distal section - Google Patents

Screw for fixing an implant, comprises a threaded section with a tool holder, a second section, and a third distal section Download PDF

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Publication number
DE202005020738U1
DE202005020738U1 DE202005020738U DE202005020738U DE202005020738U1 DE 202005020738 U1 DE202005020738 U1 DE 202005020738U1 DE 202005020738 U DE202005020738 U DE 202005020738U DE 202005020738 U DE202005020738 U DE 202005020738U DE 202005020738 U1 DE202005020738 U1 DE 202005020738U1
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DE
Germany
Prior art keywords
section
implant
pile
screw
bone
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.)
Expired - Lifetime
Application number
DE202005020738U
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German (de)
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.)
ORTHODYNAMICS GMBH, DE
Original Assignee
Eska Implants GmbH and Co KG
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Filing date
Publication date
Application filed by Eska Implants GmbH and Co KG filed Critical Eska Implants GmbH and Co KG
Priority to DE202005020738U priority Critical patent/DE202005020738U1/en
Publication of DE202005020738U1 publication Critical patent/DE202005020738U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30721—Accessories
    • A61F2/30749—Fixation appliances for connecting prostheses to the body
    • 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
    • A—HUMAN NECESSITIES
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    • 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
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • 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
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • A—HUMAN NECESSITIES
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    • 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
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    • 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
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    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
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    • 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
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875—Screwdrivers, spanners or wrenches
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
    • A61F2002/30322—The prosthesis having different structural features at different locations within the same prosthesis differing in surface structures
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • A61F2002/30408—Conical threadings
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    • A61F2/34—Acetabular cups
    • A61F2002/3429—Acetabular cups with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
    • A61F2002/3432—Acetabular cups with an integral peripheral collar or flange, e.g. oriented away from the shell centre line having apertures for receiving fixation screws
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A61F2002/348—Additional features
    • A61F2002/3482—Two hemispherical halves having completely different structures
    • 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
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4637—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for connecting or disconnecting two parts of a prosthesis
    • A61F2002/4638—Tools for performing screwing, e.g. nut or screwdrivers, or particular adaptations therefor
    • 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
    • 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

Abstract

A screw for fixing an implant (1,2) onto or in a bone, comprises at least three sections. The first section is a proximal conical threaded section (3) with a tool holder (4). The second section (5) allows the bone material to develop. The third distal section (6) has a pointed end. The second section has a hollow shaft and consists of an open mesh.

Description

Die vorliegende Erfindung betrifft eine Pfahlschraube zur Fixation eines Implantates an einem oder in einem Röhrenknochen zum dauerhaften Verbleib sowie ein Set zur Erstellung eines Gelenk- und/oder Stabilisierungsimplantates, welches zum dauerhaften Verbleib im Körper des Patienten vorgesehen ist.The The present invention relates to a post screw for fixing a Implants on one or in a long bone for permanent Whereabouts as well as a set for creating a joint and / or stabilization implant, which is intended for permanent retention in the body of the patient is.

Bislang fanden zur Fixation von Implantaten oder Implantatteilen vor allem herkömmliche Knochenschrauben Einsatz. In der Regel ist die Fixation der Implantatteile mittels der Knochenschrauben auch zufriedenstellend. Manchmal allerdings kommt es zu einer Lockerung des Sitzes der Knochenschrauben im Röhrenknochen, was für den Patienten die unangenehme Konsequenz hat, dass ein neuerlicher Eingriff stattfinden muss, um die Implantatteile wieder zu fixieren.So far especially for fixation of implants or implant parts conventional Bone screws insert. As a rule, the fixation is the implant parts by means of the bone screws also satisfactory. Sometimes, though there is a relaxation of the seat of the bone screws in the tubular bone, what kind of the patient has the unpleasant consequence that a renewed Intervention must take place to fix the implant parts again.

Vor diesem Hintergrund ist es die Aufgabe der vorliegenden Erfindung, eine sogenannte Pfahlschraube der eingangs genannten Art anzugeben, die für eine dauerhafte Fixation eines Implantates an oder in einem Röhrenknochen sorgt. Darüber hinaus soll ein Set zur Erstellung eines Gelenk- und/oder Stabilisierungsimplantates angegeben werden, welches u. a. die erwähnte Pfahlschraube enthält.In front In this context, it is the object of the present invention to provide a so-called pile bolt of the type mentioned, the for one Permanent fixation of an implant on or in a long bone provides. About that In addition, a set to create a joint and / or stabilization implant are specified which u. a. contains the mentioned pile screw.

Die erfindungsgemäße Pfahlschraube weist die Merkmale gemäß dem Anspruch 1 auf. Vorteilhafte Weiterbildungen ergeben sich aus den auf Anspruch 1 rückbezogenen Unteransprüchen.The Pile screw according to the invention has the features according to the claim 1 on. Advantageous developments emerge from the claim 1 back Dependent claims.

Das erfindungsgemäße Set weist die Merkmale des Anspruchs 6 auf. Dieses Set wird gemäß den Unteransprüchen 7 und 8 vorteilhaft weitergebildet.The inventive set has the features of claim 6. This set is according to the subclaims 7 and 8 advantageously developed.

Die Pfahlschraube weist wenigstens drei Abschnitte auf, nämlich einen ersten proximalen konischen Gewindeabschnitt mit einer stirnseitigen Werkzeugaufnahme, einen zweiten Abschnitt, der ein Einwachsen von Knochenmaterial (Spongiosa) ermöglicht, sowie einen dritten distalen Abschnitt, der ein zugespitztes Ende nach Art eine Stiftschraube aufweist. Der Gewindeabschnitt erweitert sich vom Ansatz des zweiten Abschnittes hin zu seinem eigenen proximalen Ende konisch. Diese Ausbildung meint der Begriff „konischer Gewindeabschnitt".The Pile bolt has at least three sections, namely one first proximal conical threaded portion with a frontal Tool holder, a second section that is an ingrowth of Bone material (cancellous bone) allows and a third distal portion having a tapered end has a stud in the way. The threaded section extended from the beginning of the second section to its own proximal one End conical. This training means the term "conical Threaded portion ".

Die Art der Ausbildung der Pfahlschraube sorgt zum einen dafür, dass sie durch die Verschraubung in einem Implantatteil oder Implantat mit zunehmender Verschraubung eine Einheit mit dem Implantat bildet und von der Stabilität her sich so verhält, als sei sie integraler Bestandteil des Implantates von Anfang an. Das Implantat muss hierzu wenigstens eine Gewindedurchbohrung aufweisen, mit welcher der konische Gewindeabschnitt der Pfahlschraube verschraubbar ist. Dessen Konizität ermöglicht ein Einfädeln der Pfahlschraube in die Gewindedurchbohrung im Implantat. Der zweite Abschnitt sorgt für die stabile Langzeitfixation. Nach dem Eingriff organisiert sich Spongiosa in diesen zweiten Abschnitt ein. Auf diese Weise wird einer Lockerung des Sitzes der Pfahlschraube entgegengewirkt.The The type of training of the pile screw ensures on the one hand that through the screw connection in an implant part or implant with increasing screwing forms a unit with the implant and from the stability behave like this, as if it were an integral part of the implant from the beginning. For this purpose, the implant must have at least one threaded throughbore, with which the conical threaded portion of the pile bolt screwed is. Its conicity allows a threading the post screw into the threaded hole in the implant. The second Section ensures the stable long-term fixation. After the procedure is organized Cancellous bone in this second section. This way will a relaxation of the seat of the post screw counteracted.

Die Ausbildung des zugespitzten Endes des dritten Abschnittes ermöglicht eine Führung während des Eindrehens der Pfahlschraube in den Knochen. In den Knochen wird zuvor eine Bohrung eingebracht, um so einen Knochenkanal auszubilden.The Training the pointed end of the third section allows a guide during the Screwing the post screw into the bone. In the bones will previously introduced a bore, so as to form a bone canal.

Die erfindungsgemäße Pfahlschraube übt auch eine Führungsfunktion im Sinne eines Führungszapfens aus, die bei einigen bestimmten Implantaten vorteilhaft, wenn nicht sogar notwendig ist.The Pile screw according to the invention also exercises a leadership function in the sense of a guide pin which may be beneficial for some particular implants, if not even necessary.

Gemäß einer vorteilhaften Weiterbildung weist die Pfahlschraube einen vierten Abschnitt auf, der proximal am Gewindeabschnitt angeformt und als ein eine weitere Drehung der Pfahlschraube verhindernder Anschlag ausgebildet ist. Der Anschlag verhindert also eine weitere Drehung der Pfahlschraube, wenn diese durch den Anschlag die definierte Endlage im Implantat erreicht hat.According to one advantageous development, the pile screw has a fourth Section on, the proximal formed on the threaded portion and as a further rotation of the pile bolt preventing stop is trained. The stop thus prevents further rotation the pile bolt, if this defined by the stop Has reached the final position in the implant.

Gemäß einer weiteren bevorzugten Ausführungsform ist der zweite Abschnitt als hohler Schaft ausgebildet. Dieser hohle Schaft ist besonders bevorzugt aus einem offenen, maschenförmigen Netzwerk erstellt. Ein derartiger netzartiger hohler Schaft hat sich bereits seit langem in der Zahnendoprothetik bewährt ( DE 41 05 165 ).According to another preferred embodiment, the second portion is formed as a hollow shaft. This hollow shaft is particularly preferably created from an open, mesh-like network. Such a net-like hollow shaft has been proven for a long time in the Zahnendoprothetik ( DE 41 05 165 ).

Gemäß einer noch weiteren vorteilhaften Weiterbildung weist der dritte Abschnitt im Bereich seines zugespitzten Endes wenigstens eine periphere Schneide auf. Diese Schneide kann nach der Einbringung der Bohrung in den Knochen noch überschüssiges Knochenmaterial abscheren, so dass das Eindrehen der Pfahlschraube in den Knochen erleichtert wird.According to one Yet another advantageous development, the third section at least one peripheral cutting edge in the area of its pointed end on. This cutting edge can after the introduction of the hole in the Bone still excess bone material Shear so that screwing the post screw into the bone is relieved.

Das erfindungsgemäße Set zur Erstellung eines Gelenk- und/oder Stabilisierungsimplantates umfasst die vorbeschriebene Pfahlschraube sowie Implantatteile mit jeweils mindestens einer Gewindedurchbohrung, mit welcher die mindestens eine Pfahlschraube verschraubbar ist. Die Implantatteile können Teile eines Gelenkimplantates oder aber eines Stabilisierungsimplantates sein, wie beispielsweise einer Osteosyntheseplatte. Das Implantat ist zu einem dauerhaften Verbleib im Körper des Patienten vorgesehen.The set according to the invention Creation of a joint and / or stabilization implant includes the above-mentioned pile bolt and implant parts with each at least one threaded through hole, with which the at least a pile bolt is screwed. The implant parts can parts a joint implant or a stabilization implant be such as an osteosynthesis plate. The implant is intended for permanent retention in the patient's body.

Bevorzugt weist das Set genau so viele Pfahlschrauben auf wie die Implantate Gewindedurchbohrungen für die Pfahlschrauben aufweisen.Preferably, the set has as many pile bolts as the implants thread have bores for the pile bolts.

Das Set kann auch ein Werkzeug aufweisen, welches in die Werkzeugaufnahme der Pfahlschraube einsetzbar ist zum Eindrehen der Pfahlschrauben in einen Röhrenknochen. Die Werkzeugaufnahme kann beispielsweise eine Innensechskantaufnahme sein.The Set can also have a tool which in the tool holder the pile bolt can be used to screw in the pile bolts in a long bones. The tool holder may for example be a hexagon socket.

Die Erfindung wird beispielhaft anhand eines Ausführungsbeispiels sowie zweier Anwendungsbeispiele näher erläutert. Hierbei zeigt:The Invention will be described by way of example with reference to an embodiment and two Application examples closer explained. Hereby shows:

1 die Ansicht einer Pfahlschraube, 1 the view of a post screw,

2 die Anwendung der Pfahlschraube zusammen mit einem Kondylenteil eines künstlichen Kniegelenkes, 2 the use of the post screw together with a condylar part of an artificial knee joint,

3 die perspektivische Ansicht eines Anwendungsbeispiels der Pfahlschraube zusammen mit einer künstlichen Beckenpfanne und 3 the perspective view of an application example of the pile bolt together with an artificial pelvic pan and

4 das Anwendungsbeispiel aus 3, teilweise geschnitten. 4 the application example 3 , partially cut.

Nachfolgend sind gleiche Teile mit denselben Bezugszeichen versehen.following the same parts are provided with the same reference numerals.

Einen ersten Überblick verschafft die 1, welche die Ansicht einer Pfahlschraube zeigt. Vorliegend weist die Pfahlschraube 10 vier Abschnitte auf. Proximal gelegen ist der vierte Abschnitt 7, der nach dem Eindrehen in eine Gewindedurchbohrung 9 in einem Implantat 1 oder 2 (2 und 3) eine weitere Drehung verhindert. Dem vierten Abschnitt 7 schließt sich der erste, proximal gelegene konische Gewindeabschnitt 3 an, der mit der Gewindedurchbohrung 9 im Implantat 1 oder 2 verschraubbar ist. Je weiter die Verschraubung fortgeschritten ist, desto stärker wird die Pfahlschraube 10 funktioneller Bestandteil des Gesamtimplantates.The first overview gives the 1 showing the view of a post screw. In the present case, the post screw 10 four sections up. Proximally located is the fourth section 7 after being threaded into a threaded bore 9 in an implant 1 or 2 ( 2 and 3 ) prevents further rotation. The fourth section 7 closes the first, proximally located conical threaded section 3 on, with the threaded hole 9 in the implant 1 or 2 is screwed. The further the screwing has progressed, the stronger the pile screw becomes 10 functional component of the overall implant.

Dem konischen Gewindeabschnitt 3 schließt sich ein zweiter Abschnitt 5 an, der ein Einwachsen von Spongiosa ermöglicht. Dieser Abschnitt 5 ist vorliegend als hohler Schaft ausgebildet und zwar aus einem offenen maschenförmigen Netzwerk. Distal schließlich schließt sich ein Abschnitt 6 an, der ein zugespitztes Ende nach Art einer Stiftschraube aufweist. Im Bereich des zugespitzten Endes weist der dritte Abschnitt 6 eine periphere Schneide 8 auf, mit der in einem Knochenkanal verbliebenes Knochenmaterial bei dem Eindrehen der Pfahlschraube 10 in die Gewindedurchbohrung 9 im Implantat 1 oder 2 entfernt werden kann.The conical threaded section 3 closes a second section 5 which allows ingrowth of cancellous bone. this section 5 is presently designed as a hollow shaft and that of an open mesh network. Distal finally closes a section 6 on, which has a pointed end in the manner of a stud. In the area of the pointed end points the third section 6 a peripheral cutting edge 8th on, with the bone material remaining in a bone canal when screwing in the post screw 10 in the threaded hole 9 in the implant 1 or 2 can be removed.

Für das Eindrehen der Pfahlschraube 10 in die Gewindedurchbohrung 9 wird ein Werkzeug (nicht dargestellt) mit einem Werkzeugansatz in die proximal stirnseitige Werkzeugaufnahme 4 in der Pfahlschraube 10 gesetzt.For screwing in the post screw 10 in the threaded hole 9 is a tool (not shown) with a tool approach in the proximal end-side tool holder 4 in the stake screw 10 set.

Die 2 veranschaulicht ein Anwendungsfall der Pfahlschraube 10 am Kondylenteil des Femurteils eines künstlichen Kniegelenks. Die Pfahlschraube 10 ist mit einer Gewindedurchbohrung in der Brücke zwischen den beiden Kondylen verschraubbar. Sie dient dabei als Befestigungselement und Führungszapfen, der vom Operateur optional eingebracht werden kann, sofern dies notwendig erscheint. Der Operateur bringt dann einen Knochenkanal in den Femurknochen ein und setzt das Femurteil zusammen mit der Pfahlschraube 10 über die präparierten Kondylen bzw. setzt die Pfahlschraube 10 in den zuvor eingebrachten Knochenkanal im Femurknochen.The 2 illustrates an application of the pile bolt 10 on the condyle part of the femoral part of an artificial knee joint. The stake screw 10 is screwed with a threaded through hole in the bridge between the two condyles. It serves as a fastener and guide pin, which can be optionally introduced by the surgeon, if deemed necessary. The surgeon then inserts a bone canal into the femur bone and places the femoral component together with the post screw 10 over the prepared condyles or sets the post screw 10 into the previously introduced bone canal in the femur bone.

3 zeigt eine perspektivische Ansicht eines weiteren Anwendungsbeispiels der Pfahlschrauben 10 im Zusammenhang mit einer künstlichen Beckenpfanne 2. In einer angeformten Lasche oder Flansch sind vorliegend zwei Gewindedurchbohrungen vorgesehen, mit denen jeweils eine Pfahlschraube 10 verschraubbar ist, um so für eine Langzeitstabilität des Implantates im präparierten Acetabulum zu sorgen. 3 shows a perspective view of another application example of the pile bolts 10 in connection with an artificial pelvic pan 2 , In an integrally formed tab or flange two threaded through holes are presently provided, with each of which a pile bolt 10 screwed so as to provide for a long-term stability of the implant in the prepared acetabulum.

4 zeigt das Implantat 2 aus 3, im Bereich der eingedrehten Pfahlschraube 10 im Schnitt. 4 shows the implant 2 out 3 , in the area of the screwed-in pile bolt 10 on average.

Die Pfahlschraube kann bevorzugt im Feingußverfahren mit verlorenem Positivmodell mit anschließender Bearbeitung wie Gewindeschneiden hergestellt werden.The Pile bolt can be preferred in investment casting with lost positive model with following Machining as tapping can be made.

Claims (8)

Pfahlschraube zur Fixation eines Implantates (1, 2) an einem oder in einem Röhrenknochen, aufweisend wenigstens drei Abschnitte (3, 5, 6), nämlich – einen ersten proximalen konischen Gewindeabschnitt (3) mit einer stirnseitigen Werkzeugaufnahme (4), – einen zweiten Abschnitt (5), der ein Einwachsen von Knochenmaterial (Spongiosa) ermöglicht – einen dritten distalen Abschnitt (6), der ein zugespitztes Ende nach Art einer Stiftschraube aufweist.Post screw for fixation of an implant ( 1 . 2 ) on one or in a long bone, comprising at least three sections ( 3 . 5 . 6 ), namely - a first proximal conical threaded section ( 3 ) with a frontal tool holder ( 4 ), - a second section ( 5 ), which allows ingrowth of bone material (spongiosa) - a third distal section ( 6 ), which has a pointed end in the manner of a stud. Pfahlschraube nach Anspruch 1, mit – einem vierten Abschnitt (7), der proximal am konischen Gewindeabschnitt (3) angeformt und als ein eine weitere Drehung der Pfahlschraube (10) verhindernder Anschlag ausgebildet ist.A pile bolt according to claim 1, comprising - a fourth section ( 7 ) proximal to the conical threaded portion ( 3 ) and as a further rotation of the pile bolt ( 10 ) preventing stop is formed. Pfahlschraube nach Anspruch 1 oder 2, bei der der zweite Abschnitt (5) als hohler Schaft ausgebildet ist.Stake screw according to claim 1 or 2, wherein the second section ( 5 ) is designed as a hollow shaft. Pfahlschraube nach einem der Ansprüche 1 bis 3, bei der der zweite Abschnitt (5) aus einem offenen maschenförmigen Netzwerk besteht.Stake screw according to one of claims 1 to 3, in which the second section ( 5 ) consists of an open mesh network. Pfahlschraube nach einem der Ansprüche 1 bis 4, bei der der dritte Abschnitt (6) im Bereich seines zugespitzten Endes wenigstens eine periphere Schneide (8) aufweist.Stake screw according to one of claims 1 to 4, in which the third section ( 6 ) in the region of its pointed end at least one peripheral cutting edge ( 8th ) having. Set zur Erstellung eines Gelenk- und/oder Stabilisierungsimplantates, welches zum dauerhaften Verbleib im Körper des Patienten vorgesehen ist, umfassend – mindestens eine Pfahlschraube (10) nach einem der Ansprüche 1 bis 6, und – Implantatteile (1, 2) mit jeweils mindestens einer Gewindedurchbohrung (9), mit welcher die mindestens eine Pfahlschraube (10) verschraubbar ist.Set for creating a joint and / or stabilization implant, which is intended for permanent retention in the body of the patient, comprising - at least one post screw ( 10 ) according to one of claims 1 to 6, and - implant parts ( 1 . 2 ) each with at least one threaded through bore ( 9 ), with which the at least one pile bolt ( 10 ) is screwed. Set nach Anspruch 6 mit exakt derselben Anzahl von Pfahlschrauben (10), wie die Anzahl der in den Implantatteilen (1, 2) vorhandenen Gewindedurchbohrungen (9).Set according to claim 6 with exactly the same number of pile bolts ( 10 ), how the number of implant parts ( 1 . 2 ) existing threaded holes ( 9 ). Set nach Anspruch 6 oder 7 mit einem in die Werkzeugaufnahme (4) der Pfahlschrauben (10) einsetzbares Werkzeug zum Eindrehen der Pfahlschrauben (10) in einen Röhrenknochen.Set according to claim 6 or 7 with a in the tool holder ( 4 ) of the pile bolts ( 10 ) insertable tool for screwing the pile screws ( 10 ) in a tubular bone.
DE202005020738U 2005-04-18 2005-04-18 Screw for fixing an implant, comprises a threaded section with a tool holder, a second section, and a third distal section Expired - Lifetime DE202005020738U1 (en)

Priority Applications (1)

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DE202005020738U DE202005020738U1 (en) 2005-04-18 2005-04-18 Screw for fixing an implant, comprises a threaded section with a tool holder, a second section, and a third distal section

Applications Claiming Priority (2)

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DE102005018951 2005-04-18
DE202005020738U DE202005020738U1 (en) 2005-04-18 2005-04-18 Screw for fixing an implant, comprises a threaded section with a tool holder, a second section, and a third distal section

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2571456A2 (en) * 2010-05-18 2013-03-27 Smith & Nephew, Inc. Revision hip implants and prosthesis systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2571456A2 (en) * 2010-05-18 2013-03-27 Smith & Nephew, Inc. Revision hip implants and prosthesis systems
EP2571456A4 (en) * 2010-05-18 2013-11-13 Smith & Nephew Inc Revision hip implants and prosthesis systems
US9192478B2 (en) 2010-05-18 2015-11-24 Smith & Nephew, Inc. Revision hip implants and prosthesis systems

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Effective date: 20101215

R157 Lapse of ip right after 6 years

Effective date: 20111101