DE19542116A1 - Device for fixing implant to bone - Google Patents

Device for fixing implant to bone

Info

Publication number
DE19542116A1
DE19542116A1 DE19542116A DE19542116A DE19542116A1 DE 19542116 A1 DE19542116 A1 DE 19542116A1 DE 19542116 A DE19542116 A DE 19542116A DE 19542116 A DE19542116 A DE 19542116A DE 19542116 A1 DE19542116 A1 DE 19542116A1
Authority
DE
Germany
Prior art keywords
screw
section
spherical cap
recess
implant
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.)
Withdrawn
Application number
DE19542116A
Other languages
German (de)
Inventor
Peter Brehm
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE19542116A priority Critical patent/DE19542116A1/en
Publication of DE19542116A1 publication Critical patent/DE19542116A1/en
Withdrawn legal-status Critical Current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
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8033—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
    • A61B17/8042—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers the additional component being a cover over the screw head
    • 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
    • A61F2/30744—End caps, e.g. for closing an endoprosthetic cavity
    • 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
    • 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
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • 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
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30143—Convex polygonal shapes hexagonal
    • 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
    • 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
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30378—Spherically-shaped protrusion and recess
    • 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
    • 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
    • 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
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30507—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/30774—Apertures or holes, e.g. of circular cross section internally-threaded
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/3079—Stepped or enlarged apertures, e.g. having discrete diameter changes
    • 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
    • A61F2002/3401—Acetabular cups with radial apertures, e.g. radial bores 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
    • 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
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017—Angular shapes
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Abstract

The device has three main parts. It has a main screw (6) which has rounded head (8) with a hexagonal socket in it. The screw passes through a separate lower part and the underside of the screw head seats in a hole in the lower part. The rounded underside of the screw head matches the shape of the hole in the lower part so that a good fit occurs. On the side wall of the hole is a cylindrical section which has an internal thread. A separate top section to the implant has a corresponding internal thread which fits into the thread in the hole section and a hexagonal socket head.

Description

Die Erfindung richtet sich auf eine Anordnung zur Befestigung eines Im­ plantats, insbesondere eines abschnittsweise plattenförmigen Implantats, an einem Knochen des menschlichen Körpers mittels einer Schraube, wobei das Implantat eine Schraubenbohrung aufweist.The invention is directed to an arrangement for fastening an im implant, in particular a section-like plate-shaped implant, on a bone of the human body by means of a screw, whereby the implant has a screw hole.

Derartige Anordnungen dienen beispielsweise dazu, im Bereich der Hals­ wirbelsäule Platten zum Verbinden von Wirbelkörpern anzuschrauben. Wei­ terhin kommt als derartiges Implantat beispielsweise eine Hüftpfanne bei Hüftgelenkprothesen in Betracht.Such arrangements are used, for example, in the area of the neck Screw on spine plates to connect vertebral bodies. Wei a hip socket is also included as such an implant Hip prostheses.

Dabei stellt sich das Problem, daß es häufig schwierig ist, für eine ein­ zudrehende Schraube eine Bohrung so anzubringen, daß diese Bohrung exakt senkrecht zu der Anlageebene des Schraubenkopfes verläuft. Dies resultiert daraus, daß die Bohrung intraoperativ nicht mit der gewün­ schten Genauigkeit eingebracht werden kann, oder daß aufgrund des phy­ siologischen Knochenverlaufes eine schrägverlaufende Bohrung vorteilhafter wäre.The problem arises that it is often difficult for one screw to make a hole so that this hole runs exactly perpendicular to the contact plane of the screw head. This results from the fact that the drilling intraoperatively not with the desired Most accuracy can be introduced, or that due to the phy Siological bone course an oblique hole more advantageous would.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, eine Befe­ stigung eines Implantats mittels einer Schraube derart zu realisieren, daß die Schraube erforderlichenfalls schräg zu der Anlagefläche des Schrau­ benkopfes verlaufen kann, wobei gleichwohl ein zuverlässiger Halt der Verschraubung gewährleistet sein soll. Proceeding from this, the invention is based on the object, a BEFE to realize an implant by means of a screw such that the screw, if necessary, obliquely to the contact surface of the screw benkopfes can run, while still a reliable hold of the Screw connection should be guaranteed.  

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Schraube einen zur Unterseite hin kugelkalottenförmigen Kopf aufweist, daß die Un­ terseite der Schraubenbohrung im Implantat einen kugelkalottenförmigen Seitenwand-Abschnitt aufweist, daß sich an dem kugelkalottenförmigen Ab­ schnitt der Seitenwände ein zylindrischer Abschnitt mit einem Innengewin­ de anschließt, und daß ein Schraubeinsatz ein korrespondierendes Außen­ gewinde und eine Sechskant-Schraubausnehmung aufweist, wobei an der Oberseite der Schraube eine korrespondierende Sechskant-Schraubausneh­ mung vorgesehen ist.This object is achieved in that the screw has a spherical cap-shaped head towards the bottom, that the Un a spherical cap-shaped in the implant Sidewall section has that on the spherical cap Ab cut the side walls into a cylindrical section with an internal thread de connects, and that a screw insert has a corresponding exterior thread and has a hexagonal screw recess, being on the A corresponding hexagon screw recess on top of the screw mung is provided.

Durch diese Ausgestaltung ist es möglich, die Schraube durch die Schrau­ benbohrung zu stecken und sie mittels eines Sechskant-Schlüssels einzu­ drehen, wobei die Längsachse der Schraubenbohrung durchaus auch schräg zu der Anlageebene des Schraubenkopfes verlaufen kann. Am Ende des Einschraubvorganges gelangt das untere, d. h. in Einschraubrichtung vorne liegende Ende des Schraubenkopfes zur Anlage an den unteren, d. h. in Einschraubrichtung äußeren Innenwand-Abschnitt der Schraubenboh­ rung, wobei eine flächige Anlage auch bei schräg verlaufender Schrau­ benbohrung gewährleistet ist.This configuration makes it possible to screw through the screw insert the hole and insert it using a hexagon wrench turn, the longitudinal axis of the screw hole also quite can run obliquely to the contact plane of the screw head. At the end the bottom of the screwing process, d. H. in the screwing direction front end of the screw head for contact with the lower, d. H. in the direction of screwing the outer inner wall section of the screw hole tion, with a flat system even with an inclined screw benbohrung is guaranteed.

Mit dem gleichen Sechskant-Schrauber, mit welchem die Schraube einge­ dreht wurde, wird nun anschließend der Schraubeinsatz eingedreht, wobei der Schraubeinsatz gegen die Oberseite des Schraubkopfes und diesen wie­ derum gegen die kugelabschnittförmige Innenwand der Schraubenbohrung drückt.With the same hexagon screwdriver with which the screw is inserted has been turned, the screw insert is then screwed in the screw insert against the top of the screw head and this like against the spherical section-shaped inner wall of the screw hole presses.

In weiterer Ausgestaltung der Erfindung kann vorgesehen sein, daß der Innendurchmesser des zylinderförmigen Gewindeabschnitts deutlich größer ist als der Außendurchmesser des Schraubenkörpers. Hierdurch ist es mög­ lich, daß das erforderliche Spiel für eine schräg einzusetzende Schraube frei bleibt.In a further embodiment of the invention it can be provided that the Inner diameter of the cylindrical threaded section is significantly larger is than the outside diameter of the screw body. This makes it possible Lich that the required play for an oblique screw remains free.

Günstigerweise kann sich von der Oberseite des Schraubenkopfes ein Ku­ gelkalottenabschnitt nach oben wegerstrecken, wobei der Schraubeinsatz eine kugelkalottenförmige Ausnehmung etwa korrespondierender Form aufweisen kann. Hierdurch wird eine günstige Übertragung des Anpreß­ druckes gewährleistet.Conveniently, a Ku can from the top of the screw head Stretch the gel cap section upwards, with the screw insert a spherical cap-shaped recess of approximately corresponding shape  can have. As a result, a favorable transfer of the pressure pressure guaranteed.

Weiterhin kann vorgesehen sein, daß die Oberseite des Kugelkalottenab­ schnittes aufgerauht ausgebildet ist, um im angetrockneten Zustand einen hohen Reibschluß zu ermöglichen.Furthermore, it can be provided that the top of the spherical cap cut is roughened to a in the dried state to allow high friction.

Vorteilhafterweise ist der Krümmungsradius des Kugelkalottenabschnittes kleiner als der Krümmungsradius der kugelkalottenförmigen Ausnehmung des Schraubeinsatzes.The radius of curvature of the spherical cap section is advantageous smaller than the radius of curvature of the spherical cap-shaped recess of the screw insert.

Wenn darüber hinaus günstigerweise vorgesehen ist, daß sich an die ku­ gelkalottenförmige Ausnehmung ein Zylinderabschnitt anschließt, dessen Radius kleiner ist als der Radius des Kugelkalottenabschnittes, ist unab­ hängig von der Winkelstellung der Mittel-Längs-Achse in jedem Fall ge­ währleistet, daß die Unterkante des Zylinderabschnittes sich auf der Oberseite des Kugelkalottenabschnittes eingräbt und an dieser aufgerauh­ ten Oberfläche zuverlässig festgelegt ist.If it is also conveniently provided that the ku gel dome-shaped recess connects a cylinder section, the Radius is smaller than the radius of the spherical cap section, is independent depending on the angular position of the central longitudinal axis in any case ensures that the lower edge of the cylinder section is on the Digs the top of the spherical cap section and roughened it th surface is reliably determined.

Nachfolgend wird die Erfindung anhand eines bevorzugten Ausführungsbei­ spieles in Verbindung mit der Zeichnung näher erläutert. Dabei zeigenIn the following the invention is illustrated by a preferred embodiment game explained in connection with the drawing. Show

Fig. 1 einen Schnitt durch den Schraubeinsatz, Fig. 1 shows a section through the screw insert,

Fig. 2 eine Ansicht der Oberseite der Schraube einschließlich des Schrau­ benkopfes, Fig. 2 is a view of the top of the screw including the Schrau benkopfes,

Fig. 3 einen Schnitt durch den Bereich der Schraubenbohrung des Implan­ tats und Fig. 3 shows a section through the area of the screw hole of the implant act

Fig. 4 einen Schnitt zur Veranschaulichung des Verschraubungszustandes. Fig. 4 shows a section to illustrate the screwing state.

Eine erfindungsgemäße, in der Zeichnung dargestellte Anordnung dient zur Befestigung eines Implantats 1, beispielsweise einer Hüftgelenkpfanne, an einem menschlichen Knochen. Das Implantat 1 weist eine Schraubenbohrung 2 auf, welche einen oberen, zylinderförmigen Abschnitt 3 mit einem In­ nengewinde 4 und einen sich in Schraubrichtung anschließenden, unteren, kugelkalottenförmigen Abschnitt 5 umfaßt.An arrangement according to the invention, shown in the drawing, is used to fasten an implant 1 , for example an acetabular cup, to a human bone. The implant 1 has a screw bore 2 , which comprises an upper, cylindrical section 3 with an internal thread 4 and a lower, spherical cap-shaped section 5 adjoining in the screwing direction.

Eine in Fig. 2 dargestellte Schraube 6 weist einen zylinderförmigen Schraubenkörper 7 mit einem (in der Zeichnung nicht dargestellten) Außengewinde auf. An der Oberseite des Schraubenkörpers 7 ist ein Schraubenkopf 8 vorgesehen, dessen Unterseite einen kugelkalottenförmigen Abschnitt 9 aufweist.A screw 6 shown in FIG. 2 has a cylindrical screw body 7 with an external thread (not shown in the drawing). At the top of the screw body 7 , a screw head 8 is provided, the underside of which has a spherical segment-shaped section 9 .

Oberhalb dessen ist eine zur Senkrechten 10 auf die Mittel-Längs-Achse geneigte Kragenfläche 11 vorgesehen. Die Kragenfläche 11 umgibt einen nach oben vorspringenden kugelkalottenförmigen Ansatz 12 mit einer Sechskant-Ausnehmung 13 zum Einsetzen eines Sechskantschraubers, dessen Oberfläche aufgerauht ausgebildet ist.Above that there is a collar surface 11 inclined to the vertical 10 on the central longitudinal axis. The collar surface 11 surrounds an upwardly projecting spherical cap-shaped projection 12 with a hexagonal recess 13 for inserting a hexagonal screwdriver, the surface of which is roughened.

Ein in Fig. 1 dargestellter Schraubeinsatz 14 umfaßt eine untere kugelka­ lottenförmige Ausnehmung 15, in die von der Oberseite 16 her eine Sechs­ kantausnehmung 17 für einen Sechskantschrauber mündet. Längs seiner Mantelfläche 18 weist der Schraubeinsatz ein Außengewinde 19 auf. An die kugelkalottenförmige Ausnehmung 15 schließt sich ein Zylinderabschnitt 22 an.A screw insert 14 shown in FIG. 1 comprises a lower ball-shaped recess 15 , into which a hexagon recess 17 opens from the top 16 for a hexagon screwdriver. The screw insert has an external thread 19 along its lateral surface 18 . A cylindrical section 22 adjoins the spherical cap-shaped recess 15 .

Anhand von Fig. 4 wird deutlich, wie der Schraubenschaft 7 mit einer Längsachse L schräg zu der Oberfläche 20 der Prothese eingeschraubt werden kann, bis der Kopf 8 mit seinem Kugelkalottenabschnitt 9 an dem Kugelkalottenabschnitt 5 der Schraubenbohrung 2 zur Anlage kommt. Dann wird der Schraubeinsatz 14 aufgeschraubt, der über die Innenwand der kugelkalottenförmigen Ausnehmung 15, vor allem aber über den unteren Rand des Zylinderabschnitts 22 auf die Oberseite des kugelkalottenförmi­ gen Ansatzes 12 des Schraubkopfes 8 drückt, so daß trotz der Schrägstel­ lung ein fester Halt erzielt wird.Referring to Fig. 4 it is clear how the screw shaft 7 oblique to a longitudinal axis L can be screwed to the surface 20 of the prosthesis until the head 8 comes with its Kugelkalottenabschnitt 9 at the Kugelkalottenabschnitt 5 of the screw hole 2 to the plant. Then the screw insert 14 is screwed on the inner wall of the spherical recess 15 , but above all on the lower edge of the cylinder section 22 on the top of the kugelkalottenförmi gene approach 12 of the screw head 8 , so that a firm hold is achieved despite the oblique setting .

Die Schraube kann in an sich bekannter Weise aus Titan bestehen. Der Schraubeinsatz besteht günstigerweise aus TiAl6Nb7 oder TiAl5Fe2.5.The screw can consist of titanium in a manner known per se. Of the The screw insert advantageously consists of TiAl6Nb7 or TiAl5Fe2.5.

Claims (6)

1. Anordnung zur Befestigung eines Implantats an einem Knochen des menschlichen Körpers mittels einer Schrauben wobei das Implantat eine Schraubenbohrung aufweist, dadurch gekennzeichnet, daß die Schraube (6) einen zur Unterseite hin kugelkalottenförmigen Kopf (8) aufweist, daß die Unterseite der Schraubenbohrung (2) im Implantat (1) einen kugelkalot­ tenförmigen Seitenwand-Abschnitt (5) aufweist, daß sich an den kugelka­ lottenförmigen Abschnitt (5) der Seitenwände ein zylindrischer Abschnitt (3) mit einem Innengewinde (4) anschließt, und daß ein Schraubeinsatz (14) ein korrespondierendes Außengewinde (19) und eine Schraubausneh­ mung, insbesondere Sechskant-Schraubausnehmung (17) aufweist, wobei an der Oberseite der Schraube (6) ebenfalls eine Schraubausnehmung, insbe­ sondere Sechskant-Schraubausnehmung (13) vorgesehen ist.1. Arrangement for fastening an implant to a bone of the human body by means of a screw, the implant having a screw hole, characterized in that the screw ( 6 ) has a spherical cap-shaped head ( 8 ) towards the underside that the underside of the screw hole ( 2 ) in the implant ( 1 ) has a kugelkalot-shaped side wall section ( 5 ) that a cylindrical section ( 3 ) with an internal thread ( 4 ) adjoins the kugelka soldering section ( 5 ) of the side walls, and that a screw insert ( 14 ) has a corresponding external thread ( 19 ) and a screw recess, in particular a hexagon screw recess ( 17 ), with a screw recess, in particular a special hexagon screw recess ( 13 ), also being provided on the top of the screw ( 6 ). 2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß der Innen­ durchmesser des zylinderförmigen Gewindeabschnitts (3) deutlich größer ist als der Außendurchmesser des Schraubenkörpers (7).2. Arrangement according to claim 1, characterized in that the inner diameter of the cylindrical threaded portion ( 3 ) is significantly larger than the outer diameter of the screw body ( 7 ). 3. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß sich von der Oberseite des Schraubenkopfes (9) ein Kugelkalottenabschnitt (12) nach oben weg erstreckt, wobei der Schraubeinsatz (14) eine kugelkalottenför­ mige Ausnehmung (15) etwa korrespondierender Form aufweist.3. Arrangement according to claim 1, characterized in that from the top of the screw head ( 9 ) a spherical cap section ( 12 ) extends upwards, the screw insert ( 14 ) having a kugelkalottenför shaped recess ( 15 ) approximately corresponding shape. 4. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Obersei­ te des Kugelkalottenabschnitts (12) aufgerauht ist.4. Arrangement according to claim 1, characterized in that the upper part of the spherical cap portion ( 12 ) is roughened. 5. Anordnung nach Anspruch 3, dadurch gekennzeichnet, daß der Krüm­ mungsradius des Kugelkalottenabschnittes (12) kleiner ist als der Krüm­ mungsradius der kugelkalottenförmigen Ausnehmung (15) des Schraubein­ satzes (14).5. Arrangement according to claim 3, characterized in that the radius of curvature of the spherical cap portion ( 12 ) is smaller than the radius of curvature of the spherical cap-shaped recess ( 15 ) of the screw set ( 14 ). 6. Anordnung nach Anspruch 3, dadurch gekennzeichnet, daß sich an die kugelkalottenförmige Ausnehmung (15) ein Zylinderabschnitt (22) an­ schließt, dessen Radius kleiner ist als der Radius des Kugelkalottenab­ schnittes (12).6. Arrangement according to claim 3, characterized in that to the spherical cap-shaped recess ( 15 ) a cylinder section ( 22 ) closes, the radius of which is smaller than the radius of the Kugelkalottenab section ( 12 ).
DE19542116A 1995-11-11 1995-11-11 Device for fixing implant to bone Withdrawn DE19542116A1 (en)

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