WO2000019925A1 - Intermedullary nail - Google Patents

Intermedullary nail Download PDF

Info

Publication number
WO2000019925A1
WO2000019925A1 PCT/DE1999/003254 DE9903254W WO0019925A1 WO 2000019925 A1 WO2000019925 A1 WO 2000019925A1 DE 9903254 W DE9903254 W DE 9903254W WO 0019925 A1 WO0019925 A1 WO 0019925A1
Authority
WO
WIPO (PCT)
Prior art keywords
cap
intramedullary nail
proximal end
nail
screwed
Prior art date
Application number
PCT/DE1999/003254
Other languages
German (de)
French (fr)
Inventor
Andreas Klockow
Original Assignee
Aap Implantate Ag
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 Aap Implantate Ag filed Critical Aap Implantate Ag
Publication of WO2000019925A1 publication Critical patent/WO2000019925A1/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/72Intramedullary pins, nails or other devices
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/72Intramedullary pins, nails or other devices
    • A61B17/7233Intramedullary pins, nails or other devices with special means of locking the nail to the bone
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/17Guides or aligning means for drills, mills, pins or wires
    • A61B17/1725Guides or aligning means for drills, mills, pins or wires for applying transverse screws or pins through intramedullary nails or pins
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/685Elements to be fitted on the end of screws or wires, e.g. protective caps
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/88Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/92Impactors or extractors, e.g. for removing intramedullary devices
    • A61B17/921Impactors or extractors, e.g. for removing intramedullary devices for intramedullary devices

Definitions

  • the invention relates to an intramedullary nail which can be connected at the proximal end to a holder arrangement for inserting or extracting the nail, an external and / or an internal thread being provided for fastening the holding arrangement to the proximal end of the intramedullary nail
  • the object of the invention is to provide an intramedullary nail in which welding of the cap to the end of the intramedullary nail is prevented.
  • Fig. 4 shows a modified version of the intramedullary nail
  • the intramedullary nail 1 has an external thread 2 at the end.
  • the cap 3 shown in FIG. 2 has an internal thread 6.
  • FIG. 4 shows an intramedullary nail 1 with an internal thread 13. 10 denotes a notch at the proximal end of the intramedullary nail, which interacts with a screw which serves to lock the intramedullary nail in the bone.
  • FIGS. 5 and 6 show a cap which has an undercut 8 on the outside of the base. This undercut makes it possible to use an instrument with which the cap is not only rotatable but can also be held.
  • the elastic molded element 15 is located on the outside of the cap and comes to rest on the upper edge of the intramedullary nail according to FIG. 4 when the cap is screwed in.
  • FIG. 6 shows a cap with an external threaded pin 16.
  • the elastic molded element lies on the edge of the recess of the intramedullary nail after being screwed in, so that a build-up of tension between the cap and intramedullary nail is avoided.

Abstract

The invention relates to an intermedullary nail that can be joined on a proximal end to a holder for the insertion or extraction of the nail, whereby an outer and/or inner thread is provided on the proximal end of the nail for securing the holder thereto. As known per se, a cap (3) with a matching thread can be screwed onto the proximal end. An elastic moulded element (15) is provided on the bottom (7) of the cap. The proximal end of the intermedullary nail (1) is brought into contact with said element when the cap (3) is screwed on.

Description

MarknagelIntramedullary nail
Die Erfindung betrifft einen Marknagel der am proximalen Ende mit einer Haiteanordnung für das Einsetzen bzw. Extrahieren des Nagels verbindbar ist, wobei zur Befestigung der Halteanordnung am proximalen Ende des Marknagels ein Außen- und/oder ein Innengewinde vorgesehen sindThe invention relates to an intramedullary nail which can be connected at the proximal end to a holder arrangement for inserting or extracting the nail, an external and / or an internal thread being provided for fastening the holding arrangement to the proximal end of the intramedullary nail
Ein derartiger Marknagel ist beispielsweise aus der EP 565216 bekannt.Such an intramedullary nail is known, for example, from EP 565216.
Bei Marknägeln ist es darüber hinaus bekannt am proximalen Ende eine Kappe aufzusetzen. Diese liegt in der Gegend der Knochenöffnung, durch die der Marknagel eingebracht wurde und dient zum einen als Platzhalter für das Ausschlaginstrumentarium. Andererseits werden die senkrecht zur Marknagelachse liegenden Bohrungen vor dem Einwachsen von Gewebe geschützt, so daß das Ausschlaginstrumentarium ohne zusätzliche Arbeitsgänge eingeschraubt werden kann.With intramedullary nails, it is also known to put a cap on the proximal end. This is in the area of the bone opening through which the intramedullary nail was inserted and serves on the one hand as a placeholder for the rash instruments. On the other hand, the holes perpendicular to the intramedullary nail axis are protected against tissue ingrowth, so that the extraction instruments can be screwed in without additional operations.
Als Werkstoff für die Marknägel und Kappen werden verschiedene Titanlegierungen verwendet, die infoige eines Spannungsaufbaues zu Kaltverschweißungen neigen. Dies kann dazu führen, daß die Kappe unter Umständen nur mit einem erheblichen Aufwand wieder von dem proximalen Ende des Marknagels zu trennen ist.Various titanium alloys are used as the material for the intramedullary nails and caps, which tend to cold weld when the tension builds up. This can mean that the cap can only be separated from the proximal end of the intramedullary nail with considerable effort.
Aufgabe der Erfindung ist es, einen Marknagel bereitzustellen, bei dem ein Verschweißen der Kappe mit dem Ende des Marknagel verhindert wird.The object of the invention is to provide an intramedullary nail in which welding of the cap to the end of the intramedullary nail is prevented.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß - wie an sich bekannt - auf das proximale Ende eine mit einem korrespondierenden Gewinde versehene Kappe aufschraubbar ist und daß im Kappengrund der Kappe ein elastisches Formelement vorgesehen ist, an dem das proximale Ende des Marknagels nach dem Aufschrauben der Kappe anliegt. Weitere Ausgestaltungen ergeben sich aus den Unteransprüchen.This object is achieved in that - as is known per se - a cap provided with a corresponding thread can be screwed onto the proximal end and that an elastic molded element is provided in the cap base of the cap, on which the proximal end of the intramedullary nail after unscrewing the Cap fits. Further refinements result from the subclaims.
Die Erfindung soll nachfolgend unter Bezug auf die Zeichnungen erläutert werden.The invention will be explained below with reference to the drawings.
Dabei zeigt:It shows:
Fig. 1 eine vereinfachte Darstellung des Marknagels,1 is a simplified representation of the intramedullary nail,
Fig. 2 eine Ansicht der Kappe teilweise im Schnitt,2 is a view of the cap partially in section,
Fig. 3 das proximale Ende des Marknagels mit aufgeschraubter Kappe,3 shows the proximal end of the intramedullary nail with the cap screwed on,
Fig. 4 eine abgewandelte Ausführung des Marknagels undFig. 4 shows a modified version of the intramedullary nail and
Fig. 5 und 6 Ausbildungen der Kappe.5 and 6 designs of the cap.
Der Marknagel 1 hat gemäß Figur 1 am Ende ein Außengewinde 2. Die in Figur 2 dargestellt Kappe 3 weist ein Innengewinde 6 auf.According to FIG. 1, the intramedullary nail 1 has an external thread 2 at the end. The cap 3 shown in FIG. 2 has an internal thread 6.
Wie aus der Figur 2 bzw.. 3 ersichtlich, liegt das Ende des Marknagels 1 nach dem Aufschrauben der Kappe 3 an dem im Kappengrund 5 befindlichen elastischen Formelement 15 an, so daß eine direkte Berührung und damit ein Spannungsaufbau, der zu einem Verschweißen von Marknagelende und Kappe führen könnte, vermieden wird.As can be seen from FIGS. 2 and 3, the end of the intramedullary nail 1, after the cap 3 has been screwed on, rests against the elastic molded element 15 located in the cap base 5, so that there is direct contact and thus a build-up of tension, which leads to a welding of the intramedullary nail end and cap could be avoided.
Die Figur 4 zeigt einen Marknagel 1 mit einem Innengewinde 13. Mit 10 ist eine Kerbe am proximalen Ende des Marknagels bezeichnet, die mit einer Schraube zusammenwirkt, die zur Verriegelung des Marknagels im Knochen dient.FIG. 4 shows an intramedullary nail 1 with an internal thread 13. 10 denotes a notch at the proximal end of the intramedullary nail, which interacts with a screw which serves to lock the intramedullary nail in the bone.
Die Figuren 5 und 6 zeigen eine Kappe, die an der Bodenaußenseite eine Hinterschneidung 8 aufweist. Diese Hinterschneidung ermöglicht es, daß man ein Instrument verwenden kann, mit dem die Kappe nicht nur drehbar ist sondern auch festgehalten werden kann. Bei der Ausführung nach Figur 5 befindet sich das elastische Formelement 15 an der Außenseite der Kappe und kommt beim Einschrauben der Kappe zur Auflage auf dem oberen Rand des Marknagels gemäß Figur 4.FIGS. 5 and 6 show a cap which has an undercut 8 on the outside of the base. This undercut makes it possible to use an instrument with which the cap is not only rotatable but can also be held. In the embodiment according to FIG. 5, the elastic molded element 15 is located on the outside of the cap and comes to rest on the upper edge of the intramedullary nail according to FIG. 4 when the cap is screwed in.
Die Figur 6 zeigt eine Kappe mit einem Außengewindestift 16. Auch hierbei liegt das elastische Formelement nach dem Einschrauben auf dem Rand der Ausnehmung des Marknagels auf, so daß ein Spannungsaufbau zwischen Kappe und Marknagel vermieden wird. FIG. 6 shows a cap with an external threaded pin 16. Here, too, the elastic molded element lies on the edge of the recess of the intramedullary nail after being screwed in, so that a build-up of tension between the cap and intramedullary nail is avoided.

Claims

Ansprüche Expectations
1. Marknagel der am proximalen Ende mit einer Halteanordnung für das Einsetzen bzw. Extrahieren des Nagels verbindbar ist, wobei zur Befestigung der Halteanordnung am proximalen Ende des Marknagels ein Außen- und/oder ein Innengewinde vorgesehen sind, ' dadurch gekennzeichnet, daß - wie an sich bekannt - auf das proximale Ende eine mit einem korrespondierenden Gewinde versehene Kappe (3) aufschraubbar ist und daß im Kappengrund (7) der Kappe (4) ein elastisches Formelement (15) vorgesehen ist, an dem das proximale Ende des Marknagels (1) nach dem Aufschrauben der Kappe (3) anliegt.1. intramedullary nail which can be connected at the proximal end to a holding arrangement for inserting or extracting the nail, an external and / or an internal thread being provided for fastening the holding arrangement to the proximal end of the intramedullary nail, ' characterized in that - as at known - a cap (3) provided with a corresponding thread can be screwed onto the proximal end and that an elastic molded element (15) is provided in the cap base (7) of the cap (4), on which the proximal end of the intramedullary nail (1) after screwing on the cap (3).
2. Marknagel nach Anspruch 1 , dadurch gekennzeichnet, daß der Marknagel am proximalen Ende ein Außengewinde (2) aufweist auf das die mit einem Innengewinde (6) versehene Kappe (4) aufschraubbar ist.2. intramedullary nail according to claim 1, characterized in that the intramedullary nail has an external thread (2) at the proximal end onto which the cap (4) provided with an internal thread (6) can be screwed on.
3. Marknagel nach Anspruch 1 , dadurch gekennzeichnet, daß der Marknagel ein Innengewinde (13) aufweist in das ein mit einem Außengewindestift 16 versehene Kappe (4) schraubbar ist.3. intramedullary nail according to claim 1, characterized in that the intramedullary nail has an internal thread (13) into which a cap (4) provided with an external threaded pin 16 can be screwed.
4. Marknagel nach Anspruch 1, dadurch gekennzeichnet, daß der Marknagel ein Innengewinde (13) aufweist in das eine mit einem Außengewinde 12 versehene Kappe (4) einschraubbar ist.4. intramedullary nail according to claim 1, characterized in that the intramedullary nail has an internal thread (13) into which a cap (4) provided with an external thread 12 can be screwed.
5. Marknagel nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß an dem äußeren Kappenboden eine Hinterschneidung (8) vorgesehen ist. 5. intramedullary nail according to one of the preceding claims, characterized in that an undercut (8) is provided on the outer cap bottom.
PCT/DE1999/003254 1998-10-02 1999-10-01 Intermedullary nail WO2000019925A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29818323.4 1998-10-02
DE29818323U DE29818323U1 (en) 1998-10-02 1998-10-02 Intramedullary nail

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Publication Number Publication Date
WO2000019925A1 true WO2000019925A1 (en) 2000-04-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003063721A1 (en) 2000-08-16 2003-08-07 Align Technology, Inc. Systems and methods for removing gingiva from teeth

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE529060T1 (en) * 2007-11-13 2011-11-15 Citieffe Srl REMOVABLE CLOSURE UNIT FOR AXIAL BONE CONSOLIDATION IMPLANTS
CN108523983A (en) * 2018-03-22 2018-09-14 中国人民解放军第七五医院 A kind of blocking nail merging auxiliary device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0250057A2 (en) * 1986-06-20 1987-12-23 DS-Chemie GmbH Moulding mass
WO1989007056A1 (en) * 1988-01-29 1989-08-10 Biomet, Inc. Variable wall thickness interlocking intramedullary nail and method for making same
FR2656212A1 (en) * 1989-12-27 1991-06-28 Hardy Jeanmarie CENTRO-MEDALLIONAL ENCLOSURE SYSTEM FOR IMMOBILIZING A FRACTURE OF A BONE.
EP0565216A2 (en) 1992-04-10 1993-10-13 AAP GmbH & Co. Betriebs KG Medullar nail
WO1998034555A1 (en) * 1997-02-11 1998-08-13 Orthomatrix, Inc. Modular intramedullary fixation system and insertion instrumentation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0250057A2 (en) * 1986-06-20 1987-12-23 DS-Chemie GmbH Moulding mass
WO1989007056A1 (en) * 1988-01-29 1989-08-10 Biomet, Inc. Variable wall thickness interlocking intramedullary nail and method for making same
FR2656212A1 (en) * 1989-12-27 1991-06-28 Hardy Jeanmarie CENTRO-MEDALLIONAL ENCLOSURE SYSTEM FOR IMMOBILIZING A FRACTURE OF A BONE.
EP0565216A2 (en) 1992-04-10 1993-10-13 AAP GmbH & Co. Betriebs KG Medullar nail
WO1998034555A1 (en) * 1997-02-11 1998-08-13 Orthomatrix, Inc. Modular intramedullary fixation system and insertion instrumentation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003063721A1 (en) 2000-08-16 2003-08-07 Align Technology, Inc. Systems and methods for removing gingiva from teeth

Also Published As

Publication number Publication date
DE29818323U1 (en) 1999-01-28

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