EP0404920A1 - Acetabulum reamer - Google Patents

Acetabulum reamer

Info

Publication number
EP0404920A1
EP0404920A1 EP90901798A EP90901798A EP0404920A1 EP 0404920 A1 EP0404920 A1 EP 0404920A1 EP 90901798 A EP90901798 A EP 90901798A EP 90901798 A EP90901798 A EP 90901798A EP 0404920 A1 EP0404920 A1 EP 0404920A1
Authority
EP
European Patent Office
Prior art keywords
milling
acetabulum
web
cutter according
cutter
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Withdrawn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
EP90901798A
Other languages
German (de)
French (fr)
Inventor
Klaus-Dieter Schelhas
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.)
Bristol Myers Squibb Co
Original Assignee
Bristol Myers Squibb Co
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 Bristol Myers Squibb Co filed Critical Bristol Myers Squibb Co
Publication of EP0404920A1 publication Critical patent/EP0404920A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/1662—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body
    • A61B17/1664—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body for the hip
    • A61B17/1666—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body for the hip for the acetabulum
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2217/00—General characteristics of surgical instruments
    • A61B2217/002—Auxiliary appliance
    • A61B2217/005—Auxiliary appliance with suction drainage system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2217/00—General characteristics of surgical instruments
    • A61B2217/002—Auxiliary appliance
    • A61B2217/007—Auxiliary appliance with irrigation system

Definitions

  • the invention relates to an acetabular cutter for milling out the pelvic bone acetabulum before inserting an artificial acetabular cup, with an essentially dome-shaped milling head at the end of a handle aligned with the axis of symmetry of the milling head.
  • an acetabular cutter is used, which usually has an essentially dome-shaped Raffel milling head.
  • Such grater cutters are known, for example, from European patent application 139 356 and German utility model G 87 09 738.
  • the Raffel cutter creates the milled receptacle through the Raffeln, ie the sharp-edged projections over its outer circumferential surface. These are distributed over the surface in a suitable, staggered manner. Such grater cutters are but difficult to center. In addition, the surface of the milling produced is not uniform, since the graters leave annular grooves.
  • the object of the invention is to provide an acetabular cutter of the type mentioned at the outset, which in a simple manner permits the production of receptacle cutouts with an evenly smooth surface and can be centered well.
  • the acetabular milling cutter according to the invention does not have spatulas, but rather a milling web with milling devices that extends in the manner of a screw over its outer surface. With each full revolution of the acetabulum cutter, the entire surface of the acetabulum to be machined is therefore evenly swept by the milling devices. The formation of grooves is excluded. The surface produced in this way is completely smooth and even. At the same time, the acetabular cutter according to the invention can be centered well.
  • a further advantage of the acetabulum cutter according to the invention is that the surface areas lying between the adjacent worm threads of the milling foot act as flutes, so that the chips are removed easily and without interference.
  • the acetabular cutter can be used with one or one or more milling ridges, a training with two milling ridges being currently preferred.
  • the effect can, however, be increased in an advantageous manner if the milling web is provided with a hard material grain coating on a circumferential surface and the side of the web that is adjacent to it and points in the direction of advance.
  • a diamond grain coating is particularly preferred for this.
  • a flushing fluid supply channel can be provided which runs through the stem of the acetabular cutter, for example in the form of an axial bore, and which opens into the outer surface of the cutter head.
  • the milling head in particular when working with flushing fluid, it is advantageous to design the milling head as a spherical shell, a recess or recess extending from the rear of the acetabular milling cutter in the direction of propulsion into the milling head along the stem.
  • This makes it possible to provide the spherical cap with openings through which flushing fluid guided to the outside of the milling head can flow, with chips being carried along. The chips do not have to travel the entire length of the flute, but are removed quickly and effectively from the machining area.
  • Another advantage of this configuration of the acetabular bur is the reduced weight.
  • FIG. 1 shows a schematic side view of a first embodiment of the acetabular cutter
  • FIG. 2 shows an enlarged, partially broken away section of the milling head according to FIGS. 1 and 3;
  • Fig. 3 shows a second preferred embodiment in a schematic side view
  • FIG. 4 shows a third, particularly preferred embodiment in a schematic side view.
  • the acetabular cutter 1 shown in FIG. 1 has an essentially hemispherical milling head 2 at the end of a handle 3 aligned with the axis of symmetry of the milling head 2.
  • the milling head 2 and handle 3 are turned from solid material.
  • a milling web 4 which protrudes outward from the outer surface of the milling head 2, extends helically over the outer surface of the milling head 2.
  • the milling web 4 begins near the pole 9 of the milling head 2 and ends on the side of the milling head 2 facing the handle 3. Between the worm threads of the milling web 4 there is a flute 8, which in this way also starts from the pole 9 tig runs over the outer surface of the milling head 2. -. -
  • the milling head 2 can be designed with multiple threads.
  • Milling devices are provided on the outside of the milling web 4, which cause the material to be removed when the acetabular milling cutter 1 is used. In the simplest case, these can be formed by a sharp, cutting outer edge of the milling web.
  • the embodiment of the milling device shown schematically enlarged in FIG. 2 is preferably used, in which the milling web 4 has a 0.1 mm to 2 mm wide circumferential surface 6 which is adjacent to the side of the milling web 1 in the advancing direction of the acetabular milling cutter 1 4 forms a milling edge 5.
  • a hard material grain coating 7 is applied to the peripheral surface 6 and to the side of the milling land 4 which is adjacent in the feed direction (which can also be regarded as the end region of the associated flute 8).
  • other hard materials for example boron nitride, tungsten carbide and the like.
  • synthetic diamond material of suitable grain size is particularly suitable for this.
  • the hard material grain, in particular diamond grain coating 7 is connected to the surface of the milling head 2 in a known manner.
  • the second embodiment of the invention shown schematically in FIG. 3 has a structure that is basically similar to that already described with reference to FIG. b -
  • the acetabular milling cutter 10 has an essentially hemispherical milling head 12 at the end of a handle 13 that is aligned with the axis of symmetry of the milling head 12.
  • a milling web 14 runs over the outer surface of the milling head 12 in the direction already described above with reference to FIG. 1 described manner and thus forms a flute 18.
  • the milling devices of the milling web 14 correspond to those already discussed with reference to FIGS. 1 and 2.
  • this second embodiment has a flushing fluid supply channel, with which flushing fluid can be supplied to the outer surface of the milling head 12 during operation of the acetabular cutter 10.
  • the feed channel is formed by a central axial bore 22 which extends from the free end into the handle 13 and ends just above the pole 19 of the milling head 12. From this end of the axial bore 22 two opposing tap holes 24 extend, which run obliquely to the axis of the handle 13 and close to the pole 19 within the flute 18 into the outer surface of the milling head 12.
  • the axial bore could run straight through to the outer surface and consequently open at the pole; So that the hole does not become clogged by a material core during operation, it is equipped * in the mouth area with a cutting edge that separates this material.
  • this feed channel 22, 24 would bring about an improved chip removal compared to the embodiment according to FIG. 1.
  • the rinsing fluid would flow away essentially along the flute 18. -? -
  • the milling head 12 is from the back, ie. H. provided with a recess 20 from the handle 13, so that the milling head 12 is formed by a spherical shell.
  • the recess 20 opens against the direction of advance of the acetabular cutter 10.
  • a number of openings 26 are provided within the flute 18, which connect the outer surface of the milling head 12 to the recess 20.
  • FIG. 4 shows a side view of a further embodiment of the acetabular cutter.
  • the milling head 12 is again arranged.
  • the milling web 14 is of helical design and has an outer edge which is delimited by a section of a spherical surface 30. The axis of rotation of the spherical section is aligned with the shaft axis 3a.
  • the outer edge 14a of the milling web 14 is sharpened in order to facilitate the milling process in the bone material.
  • a coating of hard material, preferably diamond grain 7, is provided on the milling web.
  • the handle 3 is designed as a hollow handle, which is closed at the pole 9 of the milling head 12 with a wall 3b, through which a flushing opening 38 for dispensing flushing liquid runs in order to - e-
  • openings 40 are also provided in the wall of the stem 3, which should serve to suck off the milled bone particles.
  • the milling web ends at the pole 9 of the milling head 12 with a transverse web 32 which runs transversely to the shaft axis 3a and has diamond grain 7 on its two side surfaces and on the underside in order to effectively mill out the pole of the acetabulum.

Abstract

Une fraise (10) pour le fraisage notamment de l'acétabulum de l'os iliaque humain avant la pose d'une cavité cotyloïde artificielle comprend une tête de fraisage (12) sur une tige (13) et au moins une arête de fraisage, (14) hélicoïdale pourvue d'organes de fraisage qui s'étend autour de l'axe de la tige. Le bord extérieur de l'arête de fraisage est délimité par une section d'une surface sphérique dont l'axe de rotation est aligné avec l'axe de la tige.A reamer (10) for reaming in particular the acetabulum of the human iliac bone before placing an artificial acetabulum comprises a reamer head (12) on a shank (13) and at least one reamer edge, (14) helical provided with milling members which extends around the axis of the rod. The outer edge of the milling edge is bounded by a section of a spherical surface whose axis of rotation is aligned with the axis of the shank.

Description

- / - - / -
ACETABULUMFRÄSERACETABULUM CUTTER
B e s c h r e i b u n gDescription
Die Erfindung betrifft einen Acetabulumfräser zum Ausfräsen des Beckenknochen-Acetabulums vor dem Ein¬ setzen einer künstlichen Hüftgelenkspfanne, mit ei¬ nem im wesentlichen kalottenförmigen Fräskopf am En¬ de eines mit der Symmetrieachse des Fräskopfes fluchtenden Stiels.The invention relates to an acetabular cutter for milling out the pelvic bone acetabulum before inserting an artificial acetabular cup, with an essentially dome-shaped milling head at the end of a handle aligned with the axis of symmetry of the milling head.
Wenn beim Ersatz zerstörter Hüftgelenke im Acetabu¬ lum des Beckenknochens eine künstliche Hüftgelenks¬ pfanne verankert werden soll, muß dafür eine ent¬ sprechende Aufnahme geschaffen werden. Diese stellt der behandelnde Chirurg während der entsprechenden Operation her; dabei kommt es darauf an, daß die Ausfräsung möglichst genau passend und so beschaf¬ fen ist, daß die Hüftgelenkspfanne sich störungs¬ frei einsetzen und sicher befestigen läßt. Zur Schaffung der Aufnahme wird ein Acetabulumfräser verwendet, der üblicherweise einen im wesentlichen kalottenförmigen Raffelfräskopf aufweist. Solche Raffelfräser sind beispielsweise aus der europä¬ ischen Patentanmeldung 139 356 und dem deutschen Ge¬ brauchsmuster G 87 09 738 bekannt.If an artificial hip joint socket is to be anchored in the acetabulum of the pelvic bone when replacing destroyed hip joints, an appropriate receptacle must be created for this. The treating surgeon produces these during the corresponding operation; it is important that the milling is as precise as possible and is such that the acetabular cup can be inserted without problems and securely attached. To create the receptacle, an acetabular cutter is used, which usually has an essentially dome-shaped Raffel milling head. Such grater cutters are known, for example, from European patent application 139 356 and German utility model G 87 09 738.
Der Raffelfräser erzeugt die Aufnahme-Ausfräsung durch die Raffeln, d. h. die über seine Außenum- fangsfl che vortretenden scharfkantigen Vorsprünge. Diese sind in geeigneter, gestaffelter Weise über die Oberfläche verteilt. Solche Raffelfräser sind jedoch schlecht zu zentrieren. Außerdem ist die Oberfläche der erzeugten Ausfräsung nicht gleich¬ mäßig, da die Raffeln ringförmige Riefen hinterlas¬ sen.The Raffel cutter creates the milled receptacle through the Raffeln, ie the sharp-edged projections over its outer circumferential surface. These are distributed over the surface in a suitable, staggered manner. Such grater cutters are but difficult to center. In addition, the surface of the milling produced is not uniform, since the graters leave annular grooves.
Aufgabe der Erfindung ist es demgegenüber, einen Acetabulumfräser der eingangs genannten Art zu schaffen, der in einfacher Weise die Erzeugung von Aufnahme-Ausfräsungen mit ebenmäßig glatter Oberflä¬ che gestattet und sich gut zentrieren läßt.In contrast, the object of the invention is to provide an acetabular cutter of the type mentioned at the outset, which in a simple manner permits the production of receptacle cutouts with an evenly smooth surface and can be centered well.
Zur Lösung dieser Aufgabe dient die Merkmalskombi¬ nation des Anspruches 1.The combination of features of claim 1 serves to achieve this object.
Der erfindungsgemäße Acetabulumfräser hat keine Raf¬ feln, sondern vielmehr einen schneckenartig über seine Außenfläche verlaufenden Frässteg mit Fräs¬ einrichtungen. Bei jeder vollen Umdrehung des Acetabulumfräsers wird daher die gesamte zu bear¬ beitende Oberfläche des Acetabulums gleichmäßig von den Fräseinrichtungen überstrichen. Die Ausbildung von Riefen ist ausgeschlossen. Die so erzeugte Ober¬ fläche ist völlig glatt und ebenmäßig. Gleichzeitig läßt sich der erfindungsgemäße Acetabulumfräser gut zentrieren.The acetabular milling cutter according to the invention does not have spatulas, but rather a milling web with milling devices that extends in the manner of a screw over its outer surface. With each full revolution of the acetabulum cutter, the entire surface of the acetabulum to be machined is therefore evenly swept by the milling devices. The formation of grooves is excluded. The surface produced in this way is completely smooth and even. At the same time, the acetabular cutter according to the invention can be centered well.
Ein weiterer Vorteil des erfindungsgemäßen Acetabu¬ lumfräsers liegt darin, daß die zwischen den benach¬ barten Schneckengängen des Frässtegs liegenden Ober¬ flächenbereiche als Spannuten wirken, so daß die Späne leicht und störungsfrei abgeführt werden.A further advantage of the acetabulum cutter according to the invention is that the surface areas lying between the adjacent worm threads of the milling foot act as flutes, so that the chips are removed easily and without interference.
Der Acetabulumfräser -läßt sich wahlweise mit einem oder mehreren Frässtegen ausbilden, wobei gegenwär¬ tig eine Ausbildung mit zwei Frässtegen bevorzugt wird.The acetabular cutter can be used with one or one or more milling ridges, a training with two milling ridges being currently preferred.
Die Fräseinrichtungen, die der Frässteg aufweist, umfassen im einfachsten Fall nur eine scharfe Außen¬ kante, die das Acetabulummaterial bei der Drehung des Fräsers abtrennt. Die Wirkung läßt sich jedoch in vorteilhafter Weise erhöhen, wenn der Frässteg an einer Umfangsflache und der dieser benachbarten, in Vortriebsrichtung weisenden Seite des Stegs mit einer Hartmaterialkornbeschichtung versehen wird. Insbesondere bevorzugt wird hierfür eine Diamant- kornbeschichtung.In the simplest case, the milling devices which the milling web has comprise only a sharp outer edge which separates the acetabular material when the milling cutter rotates. The effect can, however, be increased in an advantageous manner if the milling web is provided with a hard material grain coating on a circumferential surface and the side of the web that is adjacent to it and points in the direction of advance. A diamond grain coating is particularly preferred for this.
Zur Verbesserung der Spanabführung läßt sich ein Spülfluid-Zuführkanal vorsehen, der durch den Stiel des Acetabulumfräsers verläuft, beispielsweise in Form einer Axialbohrung, und der in der Fräskopf- Außenfläche mündet.To improve chip evacuation, a flushing fluid supply channel can be provided which runs through the stem of the acetabular cutter, for example in the form of an axial bore, and which opens into the outer surface of the cutter head.
Insbesondere beim Arbeiten mit Spülfluid ist es vor¬ teilhaft, den Fräskopf als Kalottenschale auszubil¬ den, wobei sich von der Rückseite des Acetabulumfrä¬ sers her in Vortriebsrichtung eine Ausnehmung bzw. Ausdrehung entlang dem Stiel in den Fräskopf hinein erstreckt. Dies gibt die Möglichkeit, die Kalotten¬ schale mit Durchbrechungen zu versehen, durch die zur Außenseite des Fräskopfes geführtes Spülfluid abfließen kann, wobei es Späne mitführt. So müssen die Späne nicht über die gesamte Länge der Spannut wandern, sondern werden schnell und wirksam aus dem Bearbeitungsbereich entfernt. - -In particular when working with flushing fluid, it is advantageous to design the milling head as a spherical shell, a recess or recess extending from the rear of the acetabular milling cutter in the direction of propulsion into the milling head along the stem. This makes it possible to provide the spherical cap with openings through which flushing fluid guided to the outside of the milling head can flow, with chips being carried along. The chips do not have to travel the entire length of the flute, but are removed quickly and effectively from the machining area. - -
Ein weiterer Vorteil dieser Ausgestaltung des Aceta- bulumfräsers liegt im verringerten Gewicht.Another advantage of this configuration of the acetabular bur is the reduced weight.
Im folgenden werden bevorzugte Ausführungsformen der Erfindung anhand der beigefügten Zeichnungen näher erläutert. Darin zeigen:Preferred embodiments of the invention are explained in more detail below with reference to the accompanying drawings. In it show:
Fig. 1 eine schematische Seitenansicht einer ersten Ausführungsform des Acetabulum- fräsers;1 shows a schematic side view of a first embodiment of the acetabular cutter;
Fig. 2 einen vergrößerten, teilweise weggebro¬ chenen Ausschnitt des Fraskopfes gemäß Fig. 1 und 3;FIG. 2 shows an enlarged, partially broken away section of the milling head according to FIGS. 1 and 3;
Fig. 3 eine zweite bevorzugte Ausführungsform in schematischer Seitenansicht undFig. 3 shows a second preferred embodiment in a schematic side view
Fig. 4 eine dritte, besonders bevorzugte Aus¬ führungsform in schematischer Seiten¬ ansicht.4 shows a third, particularly preferred embodiment in a schematic side view.
Der in Fig. 1 gezeigte Acetabulumfräser 1 hat einen im wesentlichen halbkugelförmigen Fräskopf 2 am En¬ de eines mit der Symmetrieachse des Fräskopfes 2 fluchtenden Stieles 3. Fräskopf 2 und Stiel 3 sind aus Vollmaterial gedreht.The acetabular cutter 1 shown in FIG. 1 has an essentially hemispherical milling head 2 at the end of a handle 3 aligned with the axis of symmetry of the milling head 2. The milling head 2 and handle 3 are turned from solid material.
Über die Außenfläche des Fräskopfes 2 verläuft schneckenförmig ein Frässteg 4, der von der Außen¬ fläche des Fräskopfes 2 auswärts vortritt. Der Fräs¬ steg 4 beginnt nahe des Poles 9 des Fräskopfes 2 und endet an der dem Stiel 3 zugewandten Seite des Fräskopfes 2. Zwischen benachbarten Schneckengängen des Frässteges 4 liegt eine Spannut 8, die auf die¬ se Weise ebenfalls vom Pol 9 ausgehend schneckenar¬ tig über die Außenfläche des Fräskopfes 2 läuft. -. -A milling web 4, which protrudes outward from the outer surface of the milling head 2, extends helically over the outer surface of the milling head 2. The milling web 4 begins near the pole 9 of the milling head 2 and ends on the side of the milling head 2 facing the handle 3. Between the worm threads of the milling web 4 there is a flute 8, which in this way also starts from the pole 9 tig runs over the outer surface of the milling head 2. -. -
Statt eines Frässtegs könnten auch zwei oder mehr solcher Frässtege vorgesehen werden, d. h. der Fräs¬ kopf 2 kann mehrgängig ausgebildet werden.Instead of a routing path, two or more routing paths of this type could also be provided. H. the milling head 2 can be designed with multiple threads.
An der Außenseite des Frässteges 4 sind Fräseinrich¬ tungen vorgesehen, die bei der Benutzung des Aceta¬ bulumfräsers 1 den Materialabtrag bewirkt. Diese können im einfachsten Fall von einer scharfen schneidenden Außenkante des Frässteges gebildet wer¬ den.Milling devices are provided on the outside of the milling web 4, which cause the material to be removed when the acetabular milling cutter 1 is used. In the simplest case, these can be formed by a sharp, cutting outer edge of the milling web.
Vorzugsweise wird jedoch die in Fig. 2 vergrößert schematisch dargestellte Ausführung der Fräseinrich¬ tung verwendet, bei der der Frässteg 4 eine 0,1 mm bis 2 mm breite Umfangsfläche 6 hat, die mit der in Vortriebsrichtung des Acetabulumfräsers 1 benachbar¬ ten Seite des Frässteges 4 eine Fräskante 5 bildet. Auf der Umfangsfläche 6 und der in Vorschubrichtung benachbarten Seite des Frässteges 4 (die auch als Endbereich der zugeordneten Spannut 8 angesehen werden kann), ist eine Hartmaterialkornbeschichtung 7 aufgebracht. Neben anderen Hartmaterialien, bei¬ spielsweise Bornitrid, Wolframkarbid u. dgl., eig¬ net sich hierfür insbesondere synthetisches Diamant¬ material geeigneter Korngröße. Die Hartmaterial¬ korn-, insbesondere DiamantkornbeSchichtung 7 wird in bekannter Weise mit der Oberfläche des Fräs¬ kopfes 2 verbunden.However, the embodiment of the milling device shown schematically enlarged in FIG. 2 is preferably used, in which the milling web 4 has a 0.1 mm to 2 mm wide circumferential surface 6 which is adjacent to the side of the milling web 1 in the advancing direction of the acetabular milling cutter 1 4 forms a milling edge 5. A hard material grain coating 7 is applied to the peripheral surface 6 and to the side of the milling land 4 which is adjacent in the feed direction (which can also be regarded as the end region of the associated flute 8). In addition to other hard materials, for example boron nitride, tungsten carbide and the like. The like, synthetic diamond material of suitable grain size is particularly suitable for this. The hard material grain, in particular diamond grain coating 7 is connected to the surface of the milling head 2 in a known manner.
Die in Fig. 3 schematisch gezeigte zweite Ausfüh- rungsform der Erfindung hat einen im Grundsatz ähn¬ lichen Aufbau wie die bereits anhand Fig. 1 be- b -The second embodiment of the invention shown schematically in FIG. 3 has a structure that is basically similar to that already described with reference to FIG. b -
schriebene Ausführungsform. Auch hier hat der Aceta¬ bulumfräser 10 einen im wesentlichen halbkugelförmi¬ gen Fräskopf 12 am Ende eines mit der Symmetrieach¬ se des Fräskopfes 12 fluchtenden Stiels 13. Ein Frässteg 14 verläuft über die Außenfläche des Fräs¬ kopfes 12 in der oben bereits anhand Fig. 1 be¬ schriebenen Weise und bildet so eine Spannut 18. Die Fräseinrichtungen des FräsSteges 14 entsprechen den anhand Fig. 1 und 2 bereits behandelten.written embodiment. Here, too, the acetabular milling cutter 10 has an essentially hemispherical milling head 12 at the end of a handle 13 that is aligned with the axis of symmetry of the milling head 12. A milling web 14 runs over the outer surface of the milling head 12 in the direction already described above with reference to FIG. 1 described manner and thus forms a flute 18. The milling devices of the milling web 14 correspond to those already discussed with reference to FIGS. 1 and 2.
Diese zweite Ausführungsform hat zur verbesserten Spanabführung einen Spülfluid-Zuführkanal, mit dem Spülfluid beim Betrieb des Acetabulumfräsers 10 zur Außenfläche des Fräskopfes 12 zugeführt werden kann. Den Zuführkanal bildet eine mittige Axialboh¬ rung 22, die sich vom freien Ende her in den Stiel 13 hinein erstreckt und dicht oberhalb des Poles 19 des Fräskopfes 12 endet. Von diesem Ende der Axial¬ bohrung 22 gehen zwei einander gegenüberliegende Stichbohrungen 24 aus, die schräg zur Achse des Stieles 13 verlaufen und nahe am Pol 19 innerhalb der Spannut 18 in die Außenfläche des Fräskopfes 12 münden. Alternativ könnte die Axialbohrung geradli¬ nig bis zur Außenfläche durchgehen und folglich am Pol münden; damit sich die Bohrung im Betrieb nicht durch einen Materialkern zusetzt, wird sie*im Mün- dungsbereich mit einer Schneide ausgestattet, die dieses Material abtrennt.For improved chip evacuation, this second embodiment has a flushing fluid supply channel, with which flushing fluid can be supplied to the outer surface of the milling head 12 during operation of the acetabular cutter 10. The feed channel is formed by a central axial bore 22 which extends from the free end into the handle 13 and ends just above the pole 19 of the milling head 12. From this end of the axial bore 22 two opposing tap holes 24 extend, which run obliquely to the axis of the handle 13 and close to the pole 19 within the flute 18 into the outer surface of the milling head 12. Alternatively, the axial bore could run straight through to the outer surface and consequently open at the pole; So that the hole does not become clogged by a material core during operation, it is equipped * in the mouth area with a cutting edge that separates this material.
Ohne weitere Maßnahmen würde schon dieser Zuführka¬ nal 22, 24 eine gegenüber der Ausführungsform gemäß Fig. 1 verbesserte Spanabführung bewirken. Dabei würde das Spülfluid im wesentlichen entlang der Spannut 18 abfließen. - ? -Without further measures, this feed channel 22, 24 would bring about an improved chip removal compared to the embodiment according to FIG. 1. The rinsing fluid would flow away essentially along the flute 18. -? -
Um eine demgegenüber noch verbesserte Spanabführung zu erhalten, ist bei der zweiten bevorzugten Ausfüh¬ rungsform der Fräskopf 12 von der Rückseite, d. h. vom Stiel 13 her mit einer Ausdrehung 20 versehen, so daß der Fräskopf 12 von einer Kalottenschale ge¬ bildet wird. Die Ausdrehung 20 öffnet sich entgegen der Vortriebsrichtung des Acetabulumfräsers 10. In¬ nerhalb der Spannut 18 sind mehrere Durchbrechungen 26 vorgesehen, die die Außenfläche des Fräskopfes 12 mit der Ausdrehung 20 verbinden. So kann das Spülfluid durch die Durchbrechungen 26 in die Aus¬ drehung 20 abfließen, was eine beschleunigte und vermehrte Spanabführung aus dem Arbeitsbereich be¬ wirkt.In order to obtain an even better chip evacuation, in the second preferred embodiment the milling head 12 is from the back, ie. H. provided with a recess 20 from the handle 13, so that the milling head 12 is formed by a spherical shell. The recess 20 opens against the direction of advance of the acetabular cutter 10. A number of openings 26 are provided within the flute 18, which connect the outer surface of the milling head 12 to the recess 20. Thus, the flushing fluid can flow through the openings 26 into the recess 20, which causes accelerated and increased chip evacuation from the work area.
Fig. 4 zeigt eine Seitenansicht einer weiteren Aus¬ führungsform des Acetabulumfräsers. Am Ende des Stieles 3 ist wiederum der Fräskopf 12 angeordnet. Der Frässteg 14 ist schneckenförmig ausgebildet und besitzt eine Außenkante, die von einem Abschnitt ei¬ ner Kugelfläche 30 begrenzt ist. Die Rotationsachse des Kugelabschnittes fluchtet mit der Stielachse 3a.FIG. 4 shows a side view of a further embodiment of the acetabular cutter. At the end of the handle 3, the milling head 12 is again arranged. The milling web 14 is of helical design and has an outer edge which is delimited by a section of a spherical surface 30. The axis of rotation of the spherical section is aligned with the shaft axis 3a.
Die Außenkante 14a des Frässteges 14 ist geschärft, um den Fräsvorgang im Knochenmaterial zu erleich¬ tern. Auf dem Frässteg ist eine Beschichtung aus Hartmaterial, bevorzugt Diamantkorn 7 vorgesehen.The outer edge 14a of the milling web 14 is sharpened in order to facilitate the milling process in the bone material. A coating of hard material, preferably diamond grain 7, is provided on the milling web.
Der Stiel 3 ist als Hohlstiel ausgebildet, der am Pol 9 des Fräskopfes 12 mit einer Wand 3b verschlos¬ sen ist, durch die eine Spülöffnung 38 zur Abgabe von Spülflüssigkeit hindurchläuft, um den Arbeitsbe- - e-The handle 3 is designed as a hollow handle, which is closed at the pole 9 of the milling head 12 with a wall 3b, through which a flushing opening 38 for dispensing flushing liquid runs in order to - e-
reich von abgefrästen Knochenpartikeln freizuhal¬ ten. Vorgesehen sind ferner zwischen den einzelnen Gängen des Frässteges 14 Durchbrechungen 40 in der Wand des Stieles 3, welche zum Absaugen der abge¬ frästen Knochenpartikel dienen sollen.rich from milled bone particles. Between the individual passages of the burr 14, openings 40 are also provided in the wall of the stem 3, which should serve to suck off the milled bone particles.
Der Frässteg läuft am Pol 9 des Fräskopfes 12 mit einem Quersteg 32 aus, welcher quer zur Stielachse 3a verläuft und an seinen beiden Seitenflächen so¬ wie an der Unterseite Diamantkorn 7 besitzt, um den Pol des Acetabulums wirksam auszufrasen. The milling web ends at the pole 9 of the milling head 12 with a transverse web 32 which runs transversely to the shaft axis 3a and has diamond grain 7 on its two side surfaces and on the underside in order to effectively mill out the pole of the acetabulum.

Claims

AcetabulumfräserA n s p r ü c h e Acetabular cutter claims
1. Acetabulumfräser zum Ausfräsen des Beckenkno- chen-Acetabulums vor dem Einsetzen einer künstli¬ chen Hüftgelenkspfanne, mit einem im wesentlichen kalottenförmigen Fräskopf am Ende eines mit der Symmetrieachse des Fräskopfes fluchtenden Stiels, dadurch gekennzeichnet, daß über die Außenfläche des Fräskopfes (2, 12) von der Nähe seines Poles (7) ausgehend schneckenartig wenigstens ein aus¬ wärts vortretender Frässteg (4, 14) verläuft, der mit Fräseinrichtungen (5, 7) versehen ist. 1. Acetabulum cutter for milling out the pelvic bone acetabulum before the insertion of an artificial acetabular cup, with an essentially dome-shaped milling head at the end of a handle aligned with the axis of symmetry of the milling head, characterized in that over the outer surface of the milling head (2, 12 ) starting from the vicinity of its pole (7), at least one milling web (4, 14) protruding outwards, which is provided with milling devices (5, 7).
2. Acetabulumfräser nach Anspruch 1, dadurch gekennzeichnet, daß zwischen zwei benachbar¬ ten Schneckengängen eine Spannut (8, 18) ausgebil¬ det ist.2. Acetabulum cutter according to claim 1, characterized in that a flute (8, 18) is formed between two adjacent worm threads.
3. Acetabulumfräser nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Fräseinrichtungen am Frässteg eine scharfe, freie Außenkante des Fräs¬ stegs umfassen.3. Acetabulum cutter according to claim 1 or 2, characterized in that the milling devices on the milling web comprise a sharp, free outer edge of the milling web.
4. Acetabulumfräser nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Fräseinric tungen am Frässteg (4, 14) eine, insbesondere zwischen 0,1 m und 2 mm breite, Umfangsfläche (6) des Frässtegs (4, 14) umfassen, die mit der in Vortriebsrichtung des Acetabulumfräsers (1, 10) benachbarten Seite des FräsStegs (4, 14) eine Fräskante' (5) bildet.4. Acetabulum cutter according to one of claims 1 to 3, characterized in that the milling devices on the milling web (4, 14) comprise a circumferential surface (6) of the milling web (4, 14), in particular between 0.1 m and 2 mm wide , which forms a milling edge '(5) with the side of the milling bar (4, 14) adjacent in the advancing direction of the acetabular cutter (1, 10).
5. Acetabulumfräser nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Fräseinrichtungen am Frässteg (4, 14) eine Hartmaterialkornbeschich- tung (7), insbesondere eine Diamantkornbeschichtung (7) umfassen.5. Acetabulum cutter according to one of claims 1 to 4, characterized in that the milling devices on the milling web (4, 14) comprise a hard material grain coating (7), in particular a diamond grain coating (7).
6. Acetabulumfräser nach Anspruch 5, dadurch gekennzeichnet, daß die Hartmaterialkornbe- schichtung (7) auf einer Umfangsfläche (6) und der dieser in Vortriebsrichtung des Acetabulumfräsers (1, 10) benachbarten Seite des Frässtegs (4, 14) vorgesehen ist. - / l -6. Acetabulum cutter according to claim 5, characterized in that the hard material grain coating (7) on a peripheral surface (6) and this in the advancing direction of the acetabular cutter (1, 10) adjacent side of the milling web (4, 14) is provided. - / l -
7. Acetabulumfräser nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß durch den Stiel (13) ein Spülfluid-Zuführkanal (22, 24) verläuft, der in der Fräskopf-Außenfläche mündet.7. Acetabulum cutter according to one of claims 1 to 6, characterized in that a flushing fluid supply channel (22, 24) runs through the stem (13) and opens into the milling head outer surface.
8. Acetabulumfräser nach Anspruch 7, dadurch gekennzeichnet, daß der Zuführkanal von einer geradlinig durchgehenden axialen Bohrung in Stiel und Fräskopf gebildet wird, in deren Mündung am Pol des Fräskopfes eine Schneide vorgesehen ist, die eine Verstopfung der Mündung verhindert.8. Acetabulum cutter according to claim 7, characterized in that the feed channel is formed by a straight through axial bore in the handle and milling head, in the mouth of which a cutting edge is provided at the pole of the milling head, which prevents clogging of the mouth.
9. Acetabulumfräser nach Anspruch 7, dadurch gekennzeichnet, daß der Zuführkanal von ei¬ ner axialen Bohrung (22) im Stiel (13) und wenig¬ stens einer in diese und in die Fräskopf-Außenflä¬ che mündenden Stichbohrung (24) gebildet wird, wo¬ bei die Stichbohrung (24) vom Pol (19) beabstan¬ det, vorzugsweise in einer Spannut (18), in die Außenfläche mündet.9. Acetabulum cutter according to claim 7, characterized in that the feed channel of ei¬ ner axial bore (22) in the handle (13) and at least one in this and in the milling head-Außenflä¬ surface opening stitch bore (24) is formed, where the tap hole (24) from the pole (19) detents, preferably in a flute (18), opens into the outer surface.
10. Acetabulumfräser nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Fräskopf (2, 12) und ggf. der Stiel (3, 13) des Acetabulumfräsers (1, 10) aus Vollmaterial gearbeitet sind.10. Acetabular cutter according to one of claims 1 to 9, characterized in that the milling head (2, 12) and possibly the handle (3, 13) of the acetabular cutter (1, 10) are made of solid material.
11. Acetabulumfräser nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß der Fräskopf (12) als Kalottenschale ausgebildet und zwischen dieser und - 11 -11. Acetabulum cutter according to one of claims 1 to 10, characterized in that the milling head (12) is designed as a spherical shell and between this and - 11 -
dem Stiel (13) eine Ausnehmung bzw. Ausdrehung (20) vorgesehen ist, die sich entgegen der Vortriebsrich¬ tung öffnet.the handle (13) is provided with a recess or recess (20) which opens against the direction of advance.
12. Acetabulumfräser nach Anspruch 11, dadurch gekennzeichnet, daß in der Kalottenschale des Fräskopfes (12) , insbesondere in den zwischen benachbarten Frässtegen (14) liegenden Spannuten (18) , Durchbrechungen (26) vorgesehen sind, die die Außenfläche des Fräskopfes (12) mit der Ausnehmung bzw. Ausdrehung (20) verbinden.12. Acetabular cutter according to claim 11, characterized in that in the spherical shell of the milling head (12), in particular in the flutes (18) lying between adjacent milling webs (14), openings (26) are provided which cover the outer surface of the milling head (12). Connect to the recess or recess (20).
13. Acetabulumfräser zum Ausfräsen des Beckenkno- chen-Acetabulums vor dem Einsetzen einer künstli¬ chen Hüftgelenkspfanne, mit einem Fräskopf am Ende eines Stiels, dadurch gekennzeichnet, daß der Fräskopf (12) we¬ nigstens einen schneckenförmig um die Stielachse (3a) verlaufenden Frässteg (14) enthält, der mit Fräseinrichtungen (5, 7) versehen ist, und dessen Außenkante von einem Abschnitt einer Kugelfläche (30) begrenzt ist, dessen Rotationsachse mit der Stielachse (3a) fluchtet oder zusammenfällt.13. Acetabulum cutter for milling out the pelvic bone acetabulum before inserting an artificial acetabular cup, with a milling head at the end of a stem, characterized in that the milling head (12) has at least one worm-shaped milling web extending around the stem axis (3a) (14), which is provided with milling devices (5, 7), and whose outer edge is delimited by a section of a spherical surface (30) whose axis of rotation is aligned or coincides with the axis of the stem (3a).
14. Acetabulumfräser nach Anspruch 13, dadurch gekennzeichnet, daß die Außenkante (14a) des Frässtegs (14) geschärft ist.14. Acetabulum cutter according to claim 13, characterized in that the outer edge (14a) of the milling web (14) is sharpened.
15. Acetabulumfräser nach Anspruch 13 oder 14, dadurch gekennzeichnet, daß die Fräseinrichtungen am Frässteg (14) eine Beschichtung aus Hartmate¬ rial, insbesondere aus Diamantkorn (7) umfassen.15. Acetabulum cutter according to claim 13 or 14, characterized in that the milling devices comprise a coating of hard material, in particular diamond grain (7), on the milling web (14).
16. Acebulumfräser nach einem der Ansprüche 13 bis 15, dadurch gekennzeichnet, daß der Stiel (3) als Hohl¬ stiel ausgebildet ist, bis zum Pol des Fräskopfes (12) verläuft und am Pol (9) des Fräskopfes (12) eine Spülöffnung (38) zur Abgabe eines Spülfluids enthält.16. Acebulum cutter according to one of claims 13 to 15, characterized in that the handle (3) is designed as a hollow handle, extends to the pole of the milling head (12) and on the pole (9) of the milling head (12) has a rinsing opening ( 38) for dispensing a flushing fluid.
17. Acetabulumfräser nach Anspruch 16, dadurch gekennzeichnet, daß die Wand des Stiels (3) zwischen den Frässtegen (14) Durchbrechungen (40) zum Absaugen von Knochenpartikeln enthält.17. Acetabulum cutter according to claim 16, characterized in that the wall of the handle (3) between the milling webs (14) contains openings (40) for suctioning off bone particles.
18. Acetabulumfräser nach einem der Ansprüche 13 bis 17, dadurch gekennzeichnet, daß der Frässteg (14) am Pol (9) des Fräskopfes (12) in einem quer zur Stielachse (3a) verlaufenden Quersteg (32) ausläuft, 18. Acetabulum cutter according to one of claims 13 to 17, characterized in that the milling web (14) at the pole (9) of the milling head (12) runs out in a transverse web (32) extending transversely to the handle axis (3a),
EP90901798A 1989-01-13 1990-01-13 Acetabulum reamer Withdrawn EP0404920A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8900331U DE8900331U1 (en) 1989-01-13 1989-01-13
DE8900331U 1989-01-13

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EP0404920A1 true EP0404920A1 (en) 1991-01-02

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EP (1) EP0404920A1 (en)
JP (1) JPH03503252A (en)
CA (1) CA2025237A1 (en)
DE (1) DE8900331U1 (en)
WO (1) WO1990007908A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1253862A4 (en) * 1999-02-01 2003-09-17 Garland U Edwards Surgical reamer cutter
US8518043B2 (en) 2007-02-09 2013-08-27 Christopher G. Sidebotham Modular spherical hollow reamer assembly for medical applications
US8403931B2 (en) 2007-02-09 2013-03-26 Christopher G. Sidebotham Modular tapered hollow reamer for medical applications
US8540716B2 (en) 2007-02-09 2013-09-24 Christopher G. Sidebotham Disposable reamer shaft or modular spherical or tapered hollow reamer assembly for medical applications
US8523866B2 (en) 2007-02-09 2013-09-03 Christopher G. Sidebotham Modular tapered hollow reamer for medical applications
US8556897B2 (en) 2007-02-09 2013-10-15 Christopher G. Sidebotham Modular spherical hollow reamer assembly for medical applications
US8357163B2 (en) 2007-02-09 2013-01-22 Sidebotham Christopher G Low cost modular tapered and spherical hollow reamers for medical applications
US8535316B2 (en) 2007-02-09 2013-09-17 Randall J. Lewis Hollow reamer for medical applications
US8449545B2 (en) 2007-02-09 2013-05-28 Christopher G. Sidebotham Low cost modular tapered hollow reamer for medical applications
EP3111865B1 (en) 2015-07-02 2020-06-17 Greatbatch Ltd. Reamer for cutting tissue
CN105496499A (en) * 2015-12-14 2016-04-20 黄少安 Medical acetabulum file
JP7350725B2 (en) * 2017-10-04 2023-09-26 デピュイ・アイルランド・アンリミテッド・カンパニー rotary surgical instrument assembly
KR102157480B1 (en) * 2018-07-10 2020-09-21 주식회사 코렌텍 Tibia Extramedullary(EM) Alignment Telescopic Assembly

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DE3404123A1 (en) * 1983-12-09 1985-06-20 Gerhard 7451 Rangendingen Schmidberger Device for drilling a hole in bone cement
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DE8900331U1 (en) 1989-02-23
CA2025237A1 (en) 1990-07-14
JPH03503252A (en) 1991-07-25
WO1990007908A1 (en) 1990-07-26

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