DE9110040U1 - Joint endoprosthesis - Google Patents
Joint endoprosthesisInfo
- Publication number
- DE9110040U1 DE9110040U1 DE9110040U DE9110040U DE9110040U1 DE 9110040 U1 DE9110040 U1 DE 9110040U1 DE 9110040 U DE9110040 U DE 9110040U DE 9110040 U DE9110040 U DE 9110040U DE 9110040 U1 DE9110040 U1 DE 9110040U1
- Authority
- DE
- Germany
- Prior art keywords
- recess
- rotation element
- shaft
- prosthesis according
- thickening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000008719 thickening Effects 0.000 claims description 16
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 210000000988 bone and bone Anatomy 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 241000309551 Arthraxon hispidus Species 0.000 claims description 2
- 230000000284 resting effect Effects 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 description 4
- 210000004394 hip joint Anatomy 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30721—Accessories
- A61F2/30739—Devices connected to the proximal part of an endoprosthetic femoral shaft for reinforcing or replacing the trochanters, e.g. the greater trochanter
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30721—Accessories
- A61F2/30734—Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
-
- 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
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3662—Femoral shafts
-
- 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
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3662—Femoral shafts
- A61F2/367—Proximal or metaphyseal parts of shafts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30159—Concave polygonal shapes
- A61F2002/30172—T-shaped
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
- A61F2002/30385—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove the rib and groove having non-parallel, e.g. conically-tapered, cooperating sides, e.g. having a trapezoidal front cross-section
-
- 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
- A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
- A61F2002/30884—Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
- A61F2002/365—Connections of heads to necks
-
- 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
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3662—Femoral shafts
- A61F2/3672—Intermediate parts of shafts
- A61F2002/3674—Connections of proximal parts to distal parts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0028—Shapes in the form of latin or greek characters
- A61F2230/0052—T-shaped
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Description
HOEGER, STELLRECHT & PARTNERHOEGER, STELLRECHT & PARTNER
PATENTANWÄLTE UHLANDSTRASSE 14 &ogr; D 7OOO STUTTGART 1PATENT ATTORNEYS UHLANDSTRASSE 14 &ogr; D 7OOO STUTTGART 1
A 50 094 u Anmelderin: AESCULAP AGA 50 094 u Applicant: AESCULAP AG
u-214 Möhringer Straßeu-214 Moehringer Strasse
13. August 1991 7200 Tuttlingen13 August 1991 7200 Tuttlingen
Die Erfindung betrifft eine Gelenkendoprothese mit einem in den Markraum eines Knochens einschiebbaren Schaft, einem daran angeordneten Gelenkkopf und mit einem radial vom Schaft abstehenden Drehsicherungselement.The invention relates to a joint endoprosthesis with a shaft that can be inserted into the medullary cavity of a bone, a joint head arranged thereon and with an anti-rotation element that protrudes radially from the shaft.
Gelenkprothesen dieser Art werden mit dem Schaft in den Markraum eines Knochens eingetrieben. Der Schaft hat normalerweise eine von der Kreisform abweichende Querschnittsfläche, so daß bereits dadurch eine gewisse Drehsicherung erreichbar ist. Um den Schaft im Markraum zusätzlich gegen eine Drehung um die Markraum-Längsachse zu sichern, ist es bekannt, an den Schaft flügelartige, radial abstehende Drehsicherungselemente anzuformen, beispielsweise einen vom Schaft nach hinten abstehenden Flügel. Beim Eintreiben des Schaftes in den Markraum kerbt sich dieser Drehsicherungsflügel in die Knochenwand ein und trägt damit zur Drehsicherung bei. Allerdings wird durch diesen Drehflügel auch das Einsetzen des Schaftes in den Markraum erschwert, insbesondere ist vor dem EinsetzenJoint prostheses of this type are driven into the medullary cavity of a bone with the shaft. The shaft normally has a cross-sectional area that deviates from a circular shape, so that a certain degree of anti-rotation can be achieved. In order to additionally secure the shaft in the medullary cavity against rotation around the longitudinal axis of the medullary cavity, it is known to form wing-like, radially protruding anti-rotation elements onto the shaft, for example a wing that protrudes backwards from the shaft. When the shaft is driven into the medullary cavity, this anti-rotation wing notches itself into the bone wall and thus contributes to the anti-rotation. However, this rotating wing also makes it more difficult to insert the shaft into the medullary cavity, in particular before inserting
AESCULAP AG ; A 50094 uAESCULAP AG ; A 50094 u
13. August 1991 u-21413 August 1991 u-214
häufig nicht genau abschätzbar, wieviel Raum zwischen dem eingesetzten Schaft einerseits und der Markrauminnenwand für das Drehsicherungselement andererseits verbleibt.It is often not possible to estimate exactly how much space remains between the inserted shaft on the one hand and the inner wall of the medullary cavity for the anti-rotation element on the other.
Es ist Aufgabe der Erfindung, eine Gelenkendoprothese der genannten Art so auszugestalten, daß das Einsetzen des Schaftes in den Markraum erleichtert wird und daß außerdem der Schaft im Markraum optimal gegen eine Drehung um die Längsachse gesichert werden kann, wobei diese Drehsicherung durch ein Drehsicherungselement erfolgt, das optimal an die Geometrie des Markraumes und des eingesetzten Schaftes angepaßt werden kann.It is the object of the invention to design a joint endoprosthesis of the type mentioned in such a way that the insertion of the shaft into the medullary cavity is facilitated and that, in addition, the shaft can be optimally secured in the medullary cavity against rotation about the longitudinal axis, whereby this rotational security is provided by a rotational security element that can be optimally adapted to the geometry of the medullary cavity and the inserted shaft.
Diese Aufgabe wird bei einer Gelenkendoprothese der eingangs beschriebenen Art erfindungsgemäß dadurch gelöst, daß das Drehsicherungselement an seiner schaftseitigen Kante eine Verdickung aufweist, die in eine entsprechende, an der Oberseite offene Ausnehmung im Schaft eingeschoben ist, und daß die Ausnehmung einen Längsschlitz aufweist, der schmaler ist als der Durchmesser der Ausnehmung und durch den das Drehsicherungselement an den Rändern des Längsschlitzes anliegend hindurchragt.This object is achieved according to the invention in a joint endoprosthesis of the type described at the outset in that the anti-rotation element has a thickening on its shaft-side edge, which is inserted into a corresponding recess in the shaft that is open at the top, and that the recess has a longitudinal slot that is narrower than the diameter of the recess and through which the anti-rotation element projects, resting against the edges of the longitudinal slot.
Durch eine solche Ausgestaltung ist es möglich, zunächst einen Schaft ohne ein Drehsicherungselement in den Markraum einzusetzen. Erst nach dem vollständigen Einsetzen des Schaftes kann der Chirurg beurteilen, wieviel Platz für das Einsetzen eines Drehsicherungselementes verbleibt, so daß er ein Drehsicherungselement optimaler Abmessung verwenden kann. Dieses läßt sich einfach von oben her nachträglich in den Schaft einsetzen, wobei es genügt, das Drehsicherungselement mit seiner Verdickung in die Ausneh-Such a design makes it possible to initially insert a shaft without an anti-rotation element into the medullary cavity. Only after the shaft has been fully inserted can the surgeon assess how much space remains for inserting an anti-rotation element, so that he can use an anti-rotation element of optimal dimensions. This can simply be subsequently inserted into the shaft from above, whereby it is sufficient to insert the anti-rotation element with its thickening into the recess.
AESCULAP AG "" A 50094 uAESCULAP AG "" A 50094 u
13. August 1991 u-21413 August 1991 u-214
mung einzuschieben. Nach dem Einschieben ist das Drehsicherungselement im Schaft durch die schwalbenschwanzähnliche Halterung gegen eine Drehung um die Längsachse der Ausnehmung und gegen eine Verschiebung quer zur Längsachse der Ausnehmung gesichert.After insertion, the anti-rotation element in the shaft is secured against rotation around the longitudinal axis of the recess and against displacement transverse to the longitudinal axis of the recess by the dovetail-like holder.
Günstig ist es, wenn das Drehsicherungselement zusätzlich in der Ausnehmung gegen eine Längsverschiebung parallel zur Längsrichtung der Ausnehmung fixiert ist. Dies läßt sich im einfachsten Fall durch eine seitlich in die Ausnehmung ragende Klemmschraube erreichen, bei anderen Ausführungsformen kann in die Ausnehmung an der Oberseite ein Verschlußelement eingeschraubt werden.It is advantageous if the anti-rotation element is also fixed in the recess to prevent longitudinal displacement parallel to the longitudinal direction of the recess. In the simplest case, this can be achieved by a clamping screw extending laterally into the recess; in other embodiments, a locking element can be screwed into the recess on the top.
Während bei diesen Fixierungsmöglichkeiten zusätzlich Fixierelemente notwendig sind, um das Drehsicherungselement in axialer Richtung festzulegen, wird ein solches zusätzliches Fixierelement bei einer bevorzugten Ausführungsform überflüssig, bei welcher vorgesehen ist, daß die Ausnehmung sich in Einschubrichtung verengt, daß die Verdickung des Drehsicherungselementes sich in gleicher Weise in Einschubrichtung verengt und daß der Neigungswinkel der Randflächen der Ausnehmung und der Verdickung gegenüber der Einschubrichtung maximal 3° beträgt, so daß beim Einschieben der Verdickung in die Ausnehmung Selbsthemmung eintritt. Es genügt also, das Drehsicherungselement mit der Verdickung kräftig in die Ausnehmung einzudrücken. Durch die Selbsthemmung wird die Verdickung dann in der Ausnehmung in axialer Richtung festgelegt, ohne daß dazu zusätzliche Fixierelemente notwendig sind.While these fixing options require additional fixing elements to fix the anti-rotation element in the axial direction, such an additional fixing element is superfluous in a preferred embodiment in which it is provided that the recess narrows in the direction of insertion, that the thickening of the anti-rotation element narrows in the same way in the direction of insertion and that the angle of inclination of the edge surfaces of the recess and the thickening with respect to the direction of insertion is a maximum of 3°, so that self-locking occurs when the thickening is pushed into the recess. It is therefore sufficient to press the anti-rotation element with the thickening firmly into the recess. The self-locking then fixes the thickening in the recess in the axial direction without the need for additional fixing elements.
AESCULAP AG "'^A 50094 uAESCULAP AG "'^A 50094 u
13. August 1991 u-21413 August 1991 u-214
Insbesondere kann die Ausnehmung konisch geformt sein, wobei dann natürlich auch die Verdickung komplementär dazu ausgebildet ist.In particular, the recess can be conical in shape, whereby the thickening is then of course also designed to complement it.
Besonders vorteilhaft ist es, wenn das Drehsicherungselement die Form einer Platte hat, die flügelähnlich durch den Schlitz nach außen ragt.It is particularly advantageous if the anti-rotation element has the shape of a plate that protrudes outwards through the slot like a wing.
Bei einer anderen Ausführungsform kann aber auch vorgesehen sein, daß sich das Drehsicherungselement an der Außenseite des Schaftes nach dem Durchtritt durch den Längsschlitz wieder verbreitert, unter Umständen kann das Drehsicherungselement den gesamten freien Raum zwischen Markraum-Innenwand und Außenseite des Schaftes ausfüllen. Bei einer solchen Ausgestaltung ist der Schaft praktisch zweiteilig und längs der Außenfläche des Schaftes geteilt, also längs einer im wesentlichen senkrecht verlaufenden Trennungsfläche.In another embodiment, however, it can also be provided that the anti-rotation element on the outside of the shaft widens again after passing through the longitudinal slot; under certain circumstances, the anti-rotation element can fill the entire free space between the inner wall of the medullary cavity and the outside of the shaft. In such a design, the shaft is practically in two parts and divided along the outer surface of the shaft, i.e. along a substantially vertical dividing surface.
Günstig ist es, wenn sich das Drehsicherungselement entgegen der Einschubrichtung radial verbreitert. Dadurch wird das Einsetzen erleichtert, da das Drehsicherungselement dann an seiner unteren, zuerst in den Markraum eintauchenden Seite eine geringere radiale Erstreckung aufweist als an seiner oberen.It is advantageous if the anti-rotation element widens radially in the opposite direction to the direction of insertion. This makes insertion easier, as the anti-rotation element then has a smaller radial extension on its lower side, which first enters the medullary cavity, than on its upper side.
Eine besonders günstige Anordnung ergibt sich, wenn die Längsachse der Ausnehmung im wesentlichen mit der Längsachse des Schaftes zusammenfällt.A particularly favourable arrangement is obtained when the longitudinal axis of the recess essentially coincides with the longitudinal axis of the shaft.
Die nachfolgende Beschreibung einer bevorzugten Ausführungsform der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:The following description of a preferred embodiment of the invention serves to explain it in more detail in conjunction with the drawing. They show:
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Figur 1 : eine Seitenansicht einer Hüftgelenkendoprothese vor dem Einsetzen des Drehsicherungselementes in teilweise aufgebrochener Darstellung undFigure 1: a side view of a hip joint endoprosthesis before insertion of the anti-rotation element in a partially broken view and
Figur 2 : eine Rückansicht der Gelenkendoprothese der Figur 1 im oberen Teil der Prothese mit eingesetztem Drehsicherungselement.Figure 2: a rear view of the joint endoprosthesis of Figure 1 in the upper part of the prosthesis with the anti-rotation element inserted.
Die in der Zeichnung dargestellte Hüftgelenkendoprothese 1 umfaßt einen zweiteiligen Schaft 2 mit einem Oberteil 3 und einem Stiel 4. Oberteil 3 und Stiel 4 sind dabei durch eine selbsthemmende Konusverbindung 5 miteinander verbunden. Dazu trägt der Stiel 4 an seiner Oberseite einen nach oben vorspringenden konischen Zapfen 6, der in eine komplementäre Konusöffnung 7 eingreift. Die Konizität liegt in der Größenordnung einiger Grad, maximal bei 6°, so daß beide Teile beim Zusammenstecken selbsthemmend miteinander verbunden sind.The hip joint endoprosthesis 1 shown in the drawing comprises a two-part shaft 2 with an upper part 3 and a stem 4. The upper part 3 and stem 4 are connected to one another by a self-locking conical connection 5. The stem 4 has an upwardly projecting conical pin 6 on its upper side, which engages in a complementary conical opening 7. The conicity is in the order of a few degrees, a maximum of 6°, so that both parts are connected to one another in a self-locking manner when they are put together.
Das Oberteil 3 ist gekrümmt ausgebildet und endet in einem weiteren seitlich schräg nach oben gerichteten Konuszapfen 8, auf den eine Gelenkkugel 9 aufgesteckt ist. Diese ist an ihrer Unterseite ebenfalls mit eine Konusöffnung 10 versehen, und auch Konuszapfen 8 und Konusausnehmung 10 bilden eine selbsthemmende Konusverbindung.The upper part 3 is curved and ends in another conical pin 8 pointing upwards at the side, onto which a joint ball 9 is placed. This is also provided with a conical opening 10 on its underside, and the conical pin 8 and the conical recess 10 also form a self-locking conical connection.
Von der Oberseite her ist in Verlängerung der Längsachse des Stieles 4 und der Konusverbindung 5 eine sich nach unten erweiternde konische Ausnehmung 11 angeordnet, die über einen Längsschlitz 12, der im dargestellten Ausfüh-From the top side, in extension of the longitudinal axis of the stem 4 and the conical connection 5, a downwardly widening conical recess 11 is arranged, which has a longitudinal slot 12, which in the illustrated embodiment
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rungsbeispiel zu der der Gelenkkugel 9 abgewandten Seite der Prothese gerichtet ist, mit dem Außenraum verbunden ist. Die Breite des Längsschlitzes 12 ist geringer als der kleinste Durchmesser der konischen Ausnehmung 11.example, is directed towards the side of the prosthesis facing away from the joint ball 9, is connected to the outside space. The width of the longitudinal slot 12 is less than the smallest diameter of the conical recess 11.
In die konische Ausnehmung 11 ist ein platten- oder flügeiförmiges Drehsicherungselement 13 einschiebbar. Dieses trägt an seiner dem Schaft 2 zugewandten Längskante eine sich konisch nach unten verengende Verdickung 14, die zu der konischen Ausnehmung 11 komplementär geformt ist. An diese Verdickung 14 schließt sich das plattenförmige Drehsicherungselement 13 an, dessen Dicke der Breite des Längsschlitzes 12 entspricht.A plate-shaped or wing-shaped anti-rotation element 13 can be inserted into the conical recess 11. This has a thickening 14 on its longitudinal edge facing the shaft 2 that tapers conically downwards and is shaped to complement the conical recess 11. This thickening 14 is followed by the plate-shaped anti-rotation element 13, the thickness of which corresponds to the width of the longitudinal slot 12.
Der Konzitätswinkel der konischen Ausnehmung 11 und der komplementären Verdickung 14 liegt in der Größenordnung von einigen Grad, beispielsweise bei maximal 3°, so daß beim Einschieben der Verdickung 14 in die konische Ausnehmung 11 Selbsthemmung eintritt. Das eingeschobene Drehsicherungselement 13 ist durch die Selbsthemmung in axialer Richtung in der konischen Ausnehmung 11 festgelegt, durch die seitliche Anlage des Flächenteils des Drehsicherungselementes 13 an den Seitenwänden des Längsschlitzes 12 wird das Drehsicherungselement 13 auch gegen jede Drehung um die Längsachse und gegen jede Verschiebung senkrecht zur Längsachse gesichert.The concentricity angle of the conical recess 11 and the complementary thickening 14 is in the order of a few degrees, for example a maximum of 3°, so that when the thickening 14 is pushed into the conical recess 11, self-locking occurs. The inserted anti-rotation element 13 is fixed in the conical recess 11 by the self-locking in the axial direction, and the lateral contact of the surface part of the anti-rotation element 13 on the side walls of the longitudinal slot 12 also secures the anti-rotation element 13 against any rotation around the longitudinal axis and against any displacement perpendicular to the longitudinal axis.
Die vom Schaft 2 abgewandte Kante 15 des Drehsicherungselementes 13 verläuft zur Unterseite schräg, das heißt die radiale Erstreckung des Drehsicherungselementes 13 ist an der Unterseite geringer als an der Oberseite. Dadurch wird das Einführen des Drehsicherungselementes in den bereits eingesetzten Schaft erleichtert.The edge 15 of the anti-rotation element 13 facing away from the shaft 2 runs obliquely towards the underside, i.e. the radial extension of the anti-rotation element 13 is smaller on the underside than on the top. This makes it easier to insert the anti-rotation element into the shaft that has already been inserted.
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Beim Einsetzen der beschriebenen Prothese wird diese zunächst außerhalb des Körpers so vormontiert, daß Stiel und Oberteil miteinander verbunden werden. Dieses kombinierte Teil wird dann in den Markraum eingesetzt, anschließend wird ein passendes Drehsicherungselement 13 in die konische Ausnehmung 11 bis zur Selbsthemmung eingeschoben.When inserting the described prosthesis, it is first pre-assembled outside the body so that the stem and upper part are connected to one another. This combined part is then inserted into the medullary cavity, after which a suitable anti-rotation element 13 is inserted into the conical recess 11 until it locks itself.
Nach Überprüfung der richtigen Position der Hüftgelenkendoprothese wird die Gelenkkugel 9 selbsthemmend auf den Konuszapfen 8 aufgesteckt.After checking the correct position of the hip joint endoprosthesis, the joint ball 9 is placed in a self-locking manner on the conical pin 8.
Es wird deutlich, daß zur Montage der gesamten Prothese keinerlei Werkzeuge notwendig sind, alle Verbindungen werden durch selbsthemmendes Zusammenstecken erzielt.It is clear that no tools are required to assemble the entire prosthesis; all connections are made by self-locking snapping together.
Es ist besonders vorteilhaft, daß der Chirurg intraoperativ entscheiden kann, welches Drehsicherungselement 13 im speziellen Fall besonders geeignet ist, es ist daher möglich, aus einer unter Umständen größeren Vielfalt von Drehsicherungselementen das am besten geeignete auszuwählen. It is particularly advantageous that the surgeon can decide intraoperatively which anti-rotation element 13 is particularly suitable in the specific case; it is therefore possible to select the most suitable from a possibly larger variety of anti-rotation elements.
Claims (8)
dadurch gekennzeichnet, daß das Drehsicherungselement1. Joint endoprosthesis with a shaft that can be inserted into the medullary cavity of a bone, a joint head arranged thereon and with an anti-rotation element protruding radially from the shaft,
characterized in that the anti-rotation element
(13) sich in gleicher Weise in Einschubrichtung verengt und daß der Neigungswinkel der Randflächen der
Ausnehmung (11) und der Verdickung (14) gegenüber der Einschubrichtung maximal 3° beträgt, so daß beim Einschieben der Verdickung (14) in die Ausnehmung (11)
Selbsthemmung eintritt.3. Prosthesis according to claim 2, characterized in that the recess (11) narrows in the insertion direction, that the thickening (14) of the anti-rotation element
(13) narrows in the same way in the direction of insertion and that the angle of inclination of the edge surfaces of the
Recess (11) and the thickening (14) relative to the insertion direction is a maximum of 3°, so that when inserting the thickening (14) into the recess (11)
Self-inhibition occurs.
(13) die Form einer Platte hat.5. Prosthesis according to one of the preceding claims, characterized in that the anti-rotation element
(13) has the shape of a plate.
Schaftes (2) zusammenfällt.8. Prosthesis according to one of the preceding claims, characterized in that the longitudinal axis of the recess (11) is substantially aligned with the longitudinal axis of the
shaft (2) coincides.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4126837A DE4126837C1 (en) | 1991-08-14 | 1991-08-14 | Hip joint prosthesis with tibia stem - has anti-rotation element with thickened part at stem facing edge |
DE9110040U DE9110040U1 (en) | 1991-08-14 | 1991-08-14 | Joint endoprosthesis |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4126837A DE4126837C1 (en) | 1991-08-14 | 1991-08-14 | Hip joint prosthesis with tibia stem - has anti-rotation element with thickened part at stem facing edge |
DE9110040U DE9110040U1 (en) | 1991-08-14 | 1991-08-14 | Joint endoprosthesis |
Publications (1)
Publication Number | Publication Date |
---|---|
DE9110040U1 true DE9110040U1 (en) | 1991-10-17 |
Family
ID=25906341
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4126837A Expired - Fee Related DE4126837C1 (en) | 1991-08-14 | 1991-08-14 | Hip joint prosthesis with tibia stem - has anti-rotation element with thickened part at stem facing edge |
DE9110040U Expired - Lifetime DE9110040U1 (en) | 1991-08-14 | 1991-08-14 | Joint endoprosthesis |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4126837A Expired - Fee Related DE4126837C1 (en) | 1991-08-14 | 1991-08-14 | Hip joint prosthesis with tibia stem - has anti-rotation element with thickened part at stem facing edge |
Country Status (1)
Country | Link |
---|---|
DE (2) | DE4126837C1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2807347B2 (en) * | 1993-02-09 | 1998-10-08 | ハウメディカ・インコーポレーテッド | Modular hip prosthesis |
FR2703583B1 (en) * | 1993-04-07 | 1995-06-09 | Medinov Sa | FEMALE IMPLANT FOR HIP PROSTHESIS. |
FR2739276B1 (en) * | 1995-09-29 | 1998-01-16 | Hy Xavier | TOTAL HIP PROSTHESIS |
FR2775586B1 (en) * | 1998-03-03 | 2000-06-30 | Tornier Sa | MODULAR ACETABULAR OR COTYLOID IMPLANT |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH459462A (en) * | 1965-05-26 | 1968-07-15 | Christiansen Tor | Hip joint prosthesis |
DE2627569C2 (en) * | 1976-06-19 | 1982-03-11 | Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim | Thigh part of a hip joint prosthesis |
FR2438469A1 (en) * | 1978-10-11 | 1980-05-09 | Tornier Sa Ets | HIP PROSTHESIS WITH ELASTIC FEMALE ROD |
DE3216539C3 (en) * | 1982-05-03 | 1997-09-25 | Link Waldemar Gmbh Co | Thigh part of a hip joint endoprosthesis |
-
1991
- 1991-08-14 DE DE4126837A patent/DE4126837C1/en not_active Expired - Fee Related
- 1991-08-14 DE DE9110040U patent/DE9110040U1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE4126837C1 (en) | 1992-11-05 |
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