DE10148022A1 - Surgical instrument to set a miller/artificial joint socket, at an acetabulum, has a swing holder at a dumb-bell structure which is locked in position for effective working in a restricted space - Google Patents

Surgical instrument to set a miller/artificial joint socket, at an acetabulum, has a swing holder at a dumb-bell structure which is locked in position for effective working in a restricted space

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Publication number
DE10148022A1
DE10148022A1 DE10148022A DE10148022A DE10148022A1 DE 10148022 A1 DE10148022 A1 DE 10148022A1 DE 10148022 A DE10148022 A DE 10148022A DE 10148022 A DE10148022 A DE 10148022A DE 10148022 A1 DE10148022 A1 DE 10148022A1
Authority
DE
Germany
Prior art keywords
acetabulum
receptacle
instrument
dumbbell
dumb
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Withdrawn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
DE10148022A
Other languages
German (de)
Inventor
Hans Grundei
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ORTHODYNAMICS GMBH, DE
Original Assignee
Eska Implants GmbH and Co KG
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 Eska Implants GmbH and Co KG filed Critical Eska Implants GmbH and Co KG
Priority to DE20122550U priority Critical patent/DE20122550U1/en
Priority to DE10148022A priority patent/DE10148022A1/en
Publication of DE10148022A1 publication Critical patent/DE10148022A1/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Withdrawn legal-status Critical Current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
    • 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
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4609—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of 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
    • A61B2017/0046—Surgical instruments, devices or methods, e.g. tourniquets with a releasable handle; with handle and operating part separable
    • A61B2017/00464—Surgical instruments, devices or methods, e.g. tourniquets with a releasable handle; with handle and operating part separable for use with different instruments
    • 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
    • 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
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • 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
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
    • A61F2002/30538—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting angular orientation
    • 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
    • A61F2002/4681—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor by applying mechanical shocks, e.g. by hammering
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0004—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
    • A61F2250/0006—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting angular orientation

Abstract

The surgical instrument, to set a miller or an artificial joint socket (3) in an acetabulum, has a dumb-bell structure (4) with a shaped handle (11). A swing holder (5) for the miller/socket is at the head end of the dumb-bell. A locking mechanism (6) fixes the holder, by a sliding sleeve (7), in a setting where the longitudinal axis (L) of the dumb-bell is aligned with the pole axis (P) of the miller/socket. The holder is mounted to the dumb-bell by a ball joint or hinge

Description

Die vorliegende Erfindung betrifft ein Instrument zum Setzen eines Fräsers zum Ausfräsen eines Acetabulums oder einer künstlichen Beckenpfanne in das Acetabulum. The present invention relates to an instrument for setting a milling cutter for milling an acetabulum or an artificial pelvic pan into the Acetabulum.

Ein Setzinstrument für eine Beckenpfanne ist beispielsweise bekannt aus der DE-A-196 28 193. Das darin beschriebene Setzinstrument besteht im wesentlichen aus einer Hantel, an deren vorderen Ende ein Kopf angebracht ist, der in spezieller Weise an die Innenkonturen der Beckenpfanne angepaßt ist. A setting instrument for a pelvic pan is known for example from the DE-A-196 28 193. The setting instrument described therein consists in essentially a dumbbell with a head attached to the front end is, which is adapted in a special way to the inner contours of the basin pan is.

Insbesondere bei der Implantation spezieller Femurhüftgelenksteile eines künstlichen Hüftgelenkes kann es mit dem bekannten Setzinstrument zu Problemen kommen. Wird beispielsweise ein Femurhüftgelenksteil gemäß der DE-A-197 20 493 implantiert, so wird nicht der gesamte Schenkelhals des Femurs reseziert, wie dies bei herkömmlichen Hüftstielen der Fall gewesen ist, sondern lediglich die Gelenkkugel entfernt. Dies mit dem Ziel, möglichst viel natürliches Knochenmaterial im Körper des Patienten zu belassen, weswegen das Femurhüftgelenksteil gemäß der genannten Druckschrift auch im wesentlichen im Schenkelhals verankert wird. Aufgrund der Resektion lediglich der natürlichen Gelenkkugel ergeben sich bei der Einfädelung der künstlichen Beckenpfanne in das Acetabulum aufgrund der äußerst beengten räumlichen Verhältnisse Positionierungsschwierigkeiten. Während nach Resektion des gesamten Schenkelhalses zur Implantation eines herkömmlichen Hüftstieles genügend Raum geschaffen wurde, um das Setzinstrument gemäß dem Stand der Technik anzusetzen und um die von diesem gehaltene Beckenpfanne im Acetabulum zu positionieren, gelingt dies bei der Resektion nur der Gelenkkugel mit dem bekannten Setzinstrument nicht. Aufgrund der räumlichen Gegebenheiten läßt sich die künstliche Beckenpfanne nicht an das Acetabulum ansetzen und danach in dieses einschlagen. Especially when implanting special femoral hip parts artificial hip joint can with the known setting instrument Problems come up. For example, a femoral hip joint part according to the DE-A-197 20 493 implanted, so not the entire femoral neck Femurs resected, as was the case with conventional hip stems, but only removed the joint ball. The goal is as much as possible why to leave natural bone material in the patient’s body the femoral hip joint part according to the mentioned document also in is essentially anchored in the femoral neck. Because of the resection only The natural joint ball results from the threading of the artificial one Pelvic pan in the acetabulum due to the extremely cramped spatial Relationships positioning difficulties. While after resection of the entire neck of the femur for implantation of a conventional hip stem enough space has been created to accommodate the setting instrument according to the state the technology and to the pelvic pan held by this in Positioning the acetabulum is only possible with resection Articulated ball with the known setting instrument not. Due to the spatial conditions, the artificial pelvic pan cannot be matched to that Place the acetabulum and then hammer into it.

Vor diesem Hintergrund ist es nun die Aufgabe der vorliegenden Erfindung, hier Abhilfe zu schaffen, daß heißt, ein Instrument anzugeben, mit welchem es auch bei äußerst engen räumlichen Verhältnissen in situ möglich ist, eine von dem Instrument gehaltene Beckenpfanne im Acetabulum anzusetzen und dort einzusetzen. Gleichfalls soll es mit dem Instrument möglich sein, anstelle der künstlichen Beckenpfanne einen Fräser zum Ausfräsen des Acetabulums anzusetzen. Against this background, it is the object of the present invention To remedy this, that is, to specify an instrument with which it is possible in situ even in extremely confined spaces, one of to place the pelvic pan held by the instrument in the acetabulum and there use. It should also be possible with the instrument instead of the artificial pelvic pan a cutter for milling out the acetabulum to be set.

Gelöst wird diese Aufgabe durch ein Instrument mit den Merkmalen des Anspruches 1. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen. This task is solved by an instrument with the characteristics of Claim 1. Advantageous further developments result from the Dependent claims.

Das erfindungsgemäße Instrument weist eine Hantel mit einer an dessen Kopfende angeordneten, frei verschwenkbaren Aufnahme für den Fräser oder die Beckenpfanne sowie einen Mechanismus zur Arretierung der Aufnahme in einer Stellung, in der die Längsachse der Hantel mit der Polachse des Fräsers oder Beckenpfanne fluchtet, auf. The instrument according to the invention has a dumbbell with one on it Head end arranged, freely swiveling holder for the milling cutter or the pelvic pan as well as a mechanism for locking the inclusion in a position in which the longitudinal axis of the barbell coincides with the polar axis of the milling cutter or the pan is aligned.

Im Gegensatz zu bekannten Beckensetzinstrumenten verfügt das erfindungsgemäße Instrument also über eine frei verschwenkbare Aufnahme am Kopf der Hantel, die durch einen Mechanismus gezielt arretiert werden kann. In contrast to known pelvic setting instruments, this has Instrument according to the invention so on a freely pivotable receptacle on Head of the barbell, which can be locked in place by a mechanism.

Operativ geht der Operateur nun wie folgt vor:
Zunächst wird die Gelenkkugel und gegebenenfalls Teile des Schenkelhalses des Femurknochens reseziert. Das Instrument, welches zuvor mit einem Fräser oder einer Beckenpfanne bestückt worden ist, wird mit der zu diesem Zeitpunkt noch frei verschwenkbaren Aufnahme in den schmalen Zwischenraum zwischen dem Acetabulum und dem resizierten Femurknochen geschoben, solange, bis der Fräser oder die Beckenpfanne in das Acetabulum eingreifen kann. Der Fräser bzw. die Beckenpfanne wird in das Acetabulum regelrecht eingefädelt. Sodann verschwenkt der Operateur die Hantel unter Verdrängung des nah anliegenden Femurs solange, bis die Polachse des Fräsers oder der Beckenpfanne mit der Längsachse der Hantel fluchtet. Bei der Verschwenkbewegung der Hantel verbleibt der Fräser bzw. die Beckenpfanne im Acetabulum, bleibt also ortsfest. Die Hantel weist meist eine Schlagfläche auf, auf die der Operateur dann mit einem Hammer oder Setzgerät schlagen kann, um die Beckenpfanne fest in das Acetabulum anzubringen. Im Falle der Bestückung der Aufnahme mit einem Fräser kann der Operateur durch Drehen der Hantel oder mittels eines ankoppelbaren motorischen Antriebs das Acetabulum für den Einsatz einer künstlichen Beckenpfanne durch Ausräumen von Knorpel und/oder Spongiosa vorbereiten. Für den Fall eines motorischen Antriebes des Fräsers dient die Hantel als Antriebswelle, welche drehbar in einem Handgriff gelagert ist und an ihrem Ende ein Anschluß beispielsweise für ein Jakobsfutter aufweist. The surgeon now operates as follows:
First, the joint ball and possibly parts of the femoral neck of the femur are resected. The instrument, which was previously fitted with a milling cutter or a pelvic socket, is pushed into the narrow space between the acetabulum and the resected femoral bone with the holder, which can still be freely pivoted at this point, until the milling cutter or pelvic socket engages in the acetabulum can. The milling cutter or pelvic socket is literally threaded into the acetabulum. The surgeon then swivels the dumbbell, displacing the nearby femur, until the polar axis of the milling cutter or the pelvic socket is aligned with the longitudinal axis of the dumbbell. During the swiveling movement of the barbell, the milling cutter or the pelvic pan remains in the acetabulum, i.e. remains stationary. The dumbbell usually has a striking surface, which the surgeon can then hit with a hammer or setting tool to firmly attach the pelvic socket into the acetabulum. If the holder is equipped with a milling cutter, the operator can prepare the acetabulum for the use of an artificial pelvic socket by removing cartilage and / or cancellous bone by rotating the barbell or using a motor drive that can be coupled. In the case of a motorized drive of the milling cutter, the dumbbell serves as a drive shaft which is rotatably mounted in a handle and has a connection at its end, for example for a Jacob's chuck.

Das erfindungsgemäße Instrument gestattet also das Einführen eines Fräsers oder einer Beckenpfanne in den schmalen Zwischenraum zwischen dem Becken und dem nahe beiliegenden resezierten Femur. The instrument according to the invention thus allows the insertion of a milling cutter or a basin pan in the narrow space between the basin and the nearby resected femur.

Besonders vorteilhaft kann die freie Verschwenkbarkeit der Aufnahme am Kopfende der Hantel dadurch erreicht werden, indem die Aufnahme mittels eines Kugelgelenkes an der Hantel angelenkt ist. Diese Ausführungsform bietet den größten Freiheitsgrad des Einsatzes des Instrumentes. The free pivotability of the receptacle can be particularly advantageous The head end of the barbell can be reached by using the a ball joint is articulated on the barbell. This embodiment offers the greatest degree of freedom in using the instrument.

Aus Kostengründen kann es wünschenswert sein, daß die Aufnahme an der Hantel mittels eines freien Schaniergelenkes angelenkt ist, welches nur in zwei Richtungen schwenkbar ist. In diesen beiden Verschwenkrichtungen aber bietet diese Ausführungsform eine höhere Stabilität als die vorerwähnte Ausführungsform. For cost reasons, it may be desirable that the admission to the Dumbbell is articulated by means of a free hinge joint, which is only available in two Directions is pivotable. But in these two pivoting directions this embodiment has a higher stability than the aforementioned Embodiment.

Gemäß einer besonders bevorzugten Ausführungsform ist die Hantel mit einer auf ihr verschiebbaren Hülse oder mit einem auf ihr verschiebbaren Hohlrohr als Arretierungsmechanismus versehen. In der ersten Schaltstellung läßt die Hülse oder das Rohr die freie Verschwenkbarkeit der Aufnahme zu, während in einer zweiten Schaltstellung die Aufnahme arretiert wird. Die Überführung zwischen der ersten und der zweiten Schaltstellung der Hülse oder des Rohres kann beispielsweise durch Drehen erfolgen, wobei der Drehwinkel nach Art eines Bajonettverschlusses begrenzt sein kann. According to a particularly preferred embodiment, the dumbbell is with a on its slidable sleeve or with a hollow tube slidable on it provided as a locking mechanism. In the first switch position, the Sleeve or the tube the free pivotability of the recording, while the receptacle is locked in a second switching position. The flyover between the first and the second switching position of the sleeve or the tube can be done for example by turning, the angle of rotation according to Art a bayonet lock can be limited.

Vorzugsweise ist die Hülse oder das Rohr zur Arretierung der Aufnahme in der besagten zweiten Schaltstellung über einen an der Aufnahme des Fräsers und/oder der Beckenpfanne angeformten Ansatz hinüberführbar, so daß eine starre Verbindung zwischen der Hantel und der Aufnahme erzeugt wird. Preferably, the sleeve or the tube for locking the receptacle in said second switching position via one on the holder of the milling cutter and / or the basin integrally molded approach can be carried over, so that a rigid connection between the barbell and the receptacle is generated.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispieles näher erläutert. Hierbei zeigt: The invention is explained in more detail below using an exemplary embodiment explained. Here shows:

Fig. 1 das mit einer Beckenpfanne bestückte Instrument in einer ersten Schaltstellung und Fig. 1 the instrument equipped with a basin pan in a first switching position and

Fig. 2 das Instrument aus Fig. 1 in der zweiten Schaltstellung, Fig. 2 shows the instrument of FIG. 1 in the second switching position,

Fig. 3 das mit einem Fräser bestückte Instrument in der ersten Schaltstellung und Fig. 3 shows the instrument equipped with a milling cutter in the first switching position and

Fig. 4 das Instrument aus Fig. 3 in der zweiten Schaltstellung. Fig. 4 shows the instrument from Fig. 3 in the second switching position.

Das Instrument besteht aus einer Hantel 4 mit Handgriff 11, an deren Kopfende die Aufnahme 5 für vorliegend eine Beckenpfanne 3 angeordnet ist. The instrument consists of a dumbbell 4 with a handle 11 , at the head end of which the receptacle 5 for a basin pan 3 is arranged.

Die Aufnahme 5 ist vorliegend durch ein freies Scharniergelenk 12 an der Hantel 4 angelenkt, derart, daß sie um den Schwenkpunkt S in Richtung des angedeuteten Doppelpfeiles schwenkbar ist. Dies bedeutet, daß die Beckenpfanne 3 mit seiner Polachse P in Bezug auf die Längsachse L der Hantel 4 bzw. vice versa frei verschwenkbar ist. In the present case, the receptacle 5 is articulated on the dumbbell 4 by a free hinge joint 12 such that it can be pivoted about the pivot point S in the direction of the double arrow indicated. This means that the pelvic pan 3 can be freely pivoted with its polar axis P with respect to the longitudinal axis L of the barbell 4 or vice versa.

Vorliegend ist an der Aufnahme 5 ein angeformter Ansatz 8 vorgesehen. In the present case, a molded-on extension 8 is provided on the receptacle 5 .

Auf der Hantel 4 ist eine verschiebbare Hülse 7 als Arretiermechanismus 6 führbar. In der ersten Schaltstellung (Fig. 1) wird die Hülse 7 mittels eines bajonettartigen Verschlusses aus Zapfen 9 und Führungsschlitz 10 in der ersten Schaltstellung arretiert. In diesem Zustand wird das Instrument mit der hier aufgesetzten Beckenpfanne 3 in den engen Raum zwischen Femur und Becken geführt, so daß die Beckenpfanne 3 in das Acetabulum eingesetzt werden kann. Sodann betätigt der Operateur das Instrument so, daß die Hantel 4 um den Schwenkpunkt S so unter Verdrängung des naheliegenden Femurs verschwenkt wird, daß die Polachse P der Beckenpfanne 3 und die Längsachse L der Hantel 4 fluchten. Sobald dies der Fall ist, betätigt der Operateur die Hülse 7 so, daß der Zapfen 9 bei Drehung der Hülse 7 außer Eingriff aus dem Führungsschlitz 10 kommt und sich die Hülse 7 durch eine Schubbewegung in Richtung des Pfeiles H mit ihrem Vorderende über den an der Aufnahme 5 angeformten Ansatz 8 schiebt. Diese Lage stellt dann die zweite Schaltstellung des Instrumentes dar, bei der nämlich die Aufnahme 5 mit der Beckenpfanne 3 sowie mit der Hantel 4 eine starre Einheit bilden. On the dumbbell 4 , a displaceable sleeve 7 can be guided as a locking mechanism 6 . In the first switching position ( FIG. 1), the sleeve 7 is locked in the first switching position by means of a bayonet-type closure consisting of a pin 9 and a guide slot 10 . In this state, the instrument with the pelvic cup 3 placed here is guided into the narrow space between the femur and the pelvis, so that the pelvic cup 3 can be inserted into the acetabulum. The surgeon then actuates the instrument so that the barbell 4 is pivoted about the pivot point S, displacing the nearby femur, so that the polar axis P of the pelvic socket 3 and the longitudinal axis L of the barbell 4 are aligned. Once this is the case, the operator operates the sleeve 7 so that the pin 9 comes and upon rotation of the sleeve 7 is disengaged from the guide slot 10, the sleeve 7 by a pushing movement in the direction of the arrow H with its front end over the at the Recording 5 molded approach 8 pushes. This position then represents the second switch position of the instrument, in which the receptacle 5 forms a rigid unit with the pelvic socket 3 and with the barbell 4 .

Der Operateur kann nun durch Schläge auf die Schlagfläche 13 am Handgriff 11 die Beckenpfanne 3 in das Acetabulum einschlagen. The surgeon can now strike the pelvic socket 3 into the acetabulum by striking the striking surface 13 on the handle 11 .

In den Fig. 3 und 4 ist ein ähnliche Ausführungsform des Instrumentes wie in den Fig. 1 und 2 dargestellt. Das Instrument gemäß den Fig. 3 und 4 aber ist in spezieller Weise adapiert an die speziellen Anforderungen die gelten, wenn mit dem Instrument ein Fräser 3' anstelle einer Beckenpfanne 3 eingesetzt werden soll, welcher elektromotorisch angetrieben das Acetabulum ausräumen soll. In FIGS. 3 and 4, a similar embodiment of the instrument as shown in Figs. 1 and 2 is shown. The instrument according to FIGS. 3 and 4 is, however, adapted in a special way to the special requirements that apply when the instrument is to be used with a milling cutter 3 'instead of a basin pan 3 , which is driven by an electric motor and is intended to clear out the acetabulum.

Nachfolgend wird daher nur kurz auf die Unterschiede zu der Ausführungsform gemäß der Fig. 1 und 2 eingegangen. The differences to the embodiment according to FIGS. 1 and 2 are therefore only briefly discussed below.

Vorliegend ist die Aufnahme 5 des Instrumentes bestückt mit einem Fräser 3'. Auf der Hantel 4 sitzt lose und drehbar der Handgriff 11. Die Hantel 4 durchgreift hierbei den Handgriff 11, um dann wieder aus ihm herauszutreten. An diesem heraustretenden Ende ist ein Sechskant 14 angeformt, damit daran beispielsweise ein Jakobsfutter eines elektromotorischen Antriebes angebracht werden kann. In the present case, the receptacle 5 of the instrument is equipped with a milling cutter 3 '. The handle 11 sits loosely and rotatably on the dumbbell 4 . The dumbbell 4 passes through the handle 11 in order to then emerge from it again. A hexagon 14 is formed on this emerging end so that, for example, a Jacob's lining of an electromotive drive can be attached to it.

Nachdem das Instrument in exakt gleicher Weise wie anhand der Fig. 1 und 2 beschrieben in die zweite Schaltstellung gebracht worden ist, kann der Operateur nun einen Elektromotor am Sechskant 14 ankoppeln. Er hält den Handgriff 11 weiter in der Hand und der Elektromotor setzt die übrigen Teile des Instrumentes in Drehbewegung. After the instrument has been brought into the second switching position in exactly the same way as described with reference to FIGS. 1 and 2, the operator can now couple an electric motor to the hexagon 14 . He continues to hold the handle 11 in his hand and the electric motor sets the remaining parts of the instrument in rotation.

Das erfindungsgemäße Instrument gestattet die Applikation eines Fräsers oder einer Beckenpfanne in räumlich äußerst begrenzten Operationsfeldern wie im Falle des Totalersatzes eines Hüftgelenkes. The instrument according to the invention permits the application of a milling cutter or a pelvic pan in extremely limited operating areas such as in Case of total replacement of a hip joint.

Claims (5)

1. Instrument zum Setzen eines Fräsers (3') oder einer künstlichen Beckenpfanne (3) in ein Acetabulum mit
einer Hantel (4),
einer am Kopfende der Hantel (4) angeordneten, frei verschwenkbaren Aufnahme (5) für den Fräser (3) und/oder die Beckenpfanne, und
einem Mechanismus (6) zur Arretierung der Aufnahme (5) in einer Stellung, in der die Längsachse (L) der Hantel (4) mit der Polachse (P) des Fräsers (3) und/oder Beckenpfanne fluchtet. 1. Instrument for inserting a milling cutter ( 3 ') or an artificial pelvic pan ( 3 ) into an acetabulum
a dumbbell ( 4 ),
a freely pivotable receptacle ( 5 ) arranged at the head end of the dumbbell ( 4 ) for the milling cutter ( 3 ) and / or the basin pan, and
a mechanism ( 6 ) for locking the receptacle ( 5 ) in a position in which the longitudinal axis (L) of the barbell ( 4 ) is aligned with the polar axis (P) of the milling cutter ( 3 ) and / or pelvic socket. 2. Instrument nach Anspruch 1, bei dem die Aufnahme (5) mittels eines Kugelgelenkes an der Hantel (4) angelenkt ist. 2. Instrument according to claim 1, wherein the receptacle ( 5 ) is articulated by means of a ball joint on the dumbbell ( 4 ). 3. Instrument nach Anspruch 1, bei dem die Aufnahme (5) mittels eines freien Scharniergelenkes (12) an der Hantel (4) angelenkt ist. 3. Instrument according to claim 1, wherein the receptacle ( 5 ) is articulated on the dumbbell ( 4 ) by means of a free hinge joint ( 12 ). 4. Instrument nach einem der Ansprüche 1 bis 3, bei dem die Hantel (4) mit einer auf ihr verschiebbaren Hülse (7) als Arretierungsmechanismus versehen ist, die in einer ersten Schaltstellung die freie Verschwenkbarkeit der Aufnahme (5) zuläßt und in einer zweiten Schaltstellung die Aufnahme (5) arretiert. 4. Instrument according to one of claims 1 to 3, in which the dumbbell ( 4 ) is provided with a sleeve ( 7 ) which can be displaced thereon as a locking mechanism which, in a first switching position, permits the receptacle ( 5 ) to pivot freely and in a second Switch position locks the holder ( 5 ). 5. Instrument nach Anspruch 4, bei dem die Hülse (7) zur Arretierung der Aufnahme (5) in der zweiten Schaltstellung über einen an der Aufnahme (5) angeformten Ansatz (8) hinüber führbar ist. 5. Instrument according to claim 4, wherein the sleeve ( 7 ) for locking the receptacle ( 5 ) in the second switching position via a molded on the receptacle ( 5 ) approach ( 8 ) can be guided over.
DE10148022A 2001-09-24 2001-09-24 Surgical instrument to set a miller/artificial joint socket, at an acetabulum, has a swing holder at a dumb-bell structure which is locked in position for effective working in a restricted space Withdrawn DE10148022A1 (en)

Priority Applications (2)

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DE20122550U DE20122550U1 (en) 2001-09-24 2001-09-24 Instrument for setting a cutter or an artificial pelvic cup in an acetabulum
DE10148022A DE10148022A1 (en) 2001-09-24 2001-09-24 Surgical instrument to set a miller/artificial joint socket, at an acetabulum, has a swing holder at a dumb-bell structure which is locked in position for effective working in a restricted space

Applications Claiming Priority (1)

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DE10148022A DE10148022A1 (en) 2001-09-24 2001-09-24 Surgical instrument to set a miller/artificial joint socket, at an acetabulum, has a swing holder at a dumb-bell structure which is locked in position for effective working in a restricted space

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EP4119068A1 (en) * 2021-07-16 2023-01-18 Orthosoft ULC Robotically assisted surgical reaming

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CN102958471A (en) * 2010-06-25 2013-03-06 陶瓷技术有限责任公司 Insertion instrument for inserting socket insets into hip sockets for hip endoprostheses
WO2011161166A1 (en) * 2010-06-25 2011-12-29 Ceramtec Gmbh Insertion instrument for inserting socket insets into hip sockets for hip endoprostheses
RU2574375C2 (en) * 2010-06-25 2016-02-10 Керамтек Гмбх Installation instrument for placing inserts into cotyloid cavity for hip replacement
US9289313B2 (en) 2010-06-25 2016-03-22 Ceramtec Gmbh Insertion instrument for inserting socket insets into hip sockets for hip endoprostheses
CN102958471B (en) * 2010-06-25 2017-04-26 陶瓷技术有限责任公司 Insertion instrument for inserting socket insets into hip sockets for hip endoprostheses
KR101824619B1 (en) * 2010-06-25 2018-03-14 세람테크 게엠베하 Insertion instrument for inserting socket insets into hip sockets for hip endoprostheses
WO2014042983A1 (en) * 2012-09-14 2014-03-20 Biomet Manufacturing, Llc Method and apparatus for implanting a prosthesis
US9241811B2 (en) 2012-09-14 2016-01-26 Biomet Manufacturing, Llc Method and apparatus for implanting a prosthesis
CN110811939A (en) * 2019-12-13 2020-02-21 刘瑞宇 Acetabular prosthesis positioning device for unilateral hip arthroplasty and positioning method thereof
EP4119068A1 (en) * 2021-07-16 2023-01-18 Orthosoft ULC Robotically assisted surgical reaming

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