DE4421153A1 - Prodn. of hip joint endoprosthesis insertable in bone cavity of patient - Google Patents

Prodn. of hip joint endoprosthesis insertable in bone cavity of patient

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Publication number
DE4421153A1
DE4421153A1 DE19944421153 DE4421153A DE4421153A1 DE 4421153 A1 DE4421153 A1 DE 4421153A1 DE 19944421153 DE19944421153 DE 19944421153 DE 4421153 A DE4421153 A DE 4421153A DE 4421153 A1 DE4421153 A1 DE 4421153A1
Authority
DE
Grant status
Application
Patent type
Prior art keywords
characterized
method according
prosthesis
bone
device
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.)
Ceased
Application number
DE19944421153
Other languages
German (de)
Inventor
Curt Dr Ing Kranz
Thorsten Dipl Ing Schmitz
Hans-Joachim Dr Ing Fischer
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.)
BIOMET MERCK DEUTSCHLAND GMBH, 14167 BERLIN, DE
Original Assignee
Artos Medizinische Produkte 12277 Berlin De GmbH
ARTOS MED PRODUKTE
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

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Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/42Recording and playback systems, i.e. in which the programme is recorded from a cycle of operations, e.g. the cycle of operations being manually controlled, after which this record is played back on the same machine
    • G05B19/4202Recording and playback systems, i.e. in which the programme is recorded from a cycle of operations, e.g. the cycle of operations being manually controlled, after which this record is played back on the same machine preparation of the programme medium using a drawing, a model
    • G05B19/4207Recording and playback systems, i.e. in which the programme is recorded from a cycle of operations, e.g. the cycle of operations being manually controlled, after which this record is played back on the same machine preparation of the programme medium using a drawing, a model in which a model is traced or scanned and corresponding data recorded
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/3094Designing or manufacturing processes
    • A61F2/30942Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3662Femoral shafts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3662Femoral shafts
    • A61F2/367Proximal or metaphyseal parts of shafts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3662Femoral shafts
    • A61F2/3672Intermediate parts of shafts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3662Femoral shafts
    • A61F2/3676Distal or diaphyseal parts of shafts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/3011Cross-sections or two-dimensional shapes
    • A61F2002/30112Rounded shapes, e.g. with rounded corners
    • A61F2002/30125Rounded shapes, e.g. with rounded corners elliptical or oval
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/3011Cross-sections or two-dimensional shapes
    • A61F2002/30112Rounded shapes, e.g. with rounded corners
    • A61F2002/30131Rounded shapes, e.g. with rounded corners horseshoe- or crescent- or C-shaped or U-shaped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves
    • A61F2002/3082Grooves
    • A61F2002/30827Plurality of grooves
    • A61F2002/30828Plurality of grooves parallel
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves
    • A61F2002/30878Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30879Ribs
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/3094Designing or manufacturing processes
    • A61F2/30942Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
    • A61F2002/30952Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using CAD-CAM techniques or NC-techniques
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004Rounded shapes, e.g. with rounded corners
    • A61F2230/0008Rounded shapes, e.g. with rounded corners elliptical or oval
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004Rounded shapes, e.g. with rounded corners
    • A61F2230/0013Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00Program-control systems
    • G05B2219/30Nc systems
    • G05B2219/45Nc applications
    • G05B2219/45145Milling
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00Program-control systems
    • G05B2219/30Nc systems
    • G05B2219/45Nc applications
    • G05B2219/45166Tomography
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00Program-control systems
    • G05B2219/30Nc systems
    • G05B2219/45Nc applications
    • G05B2219/45168Bone prosthesis

Abstract

The prodn. involves shaping a surface and machineing is carried out to produce the required outline or local recesses. The elasticity of the prosthesis shaft (2), in the insertable region of the bone, is essentially matched to the elasticity of the adjacent bone (13). The machining is carried out using a machine tool system (23) with a tool (14'). The spatial movement coordinates of which are obtained using computer tomography, multiplex holography and/or nuclear-spin resonance tomography.

Description

Die Erfindung betrifft ein Verfahren der im Oberbegriff des Anspruchs 1 angegebenen Art und bezieht sich auf die Herstellung einer individuell, mehrdimensional zu gestal tenden Schaftprothese, insbesondere Hüftgelenksprothese. The invention relates to a method of the type indicated in the preamble of claim 1 and relates to the production of an individual, multi-dimensional decor with dark to Tenden shaft prosthesis, in particular hip joint prosthesis.

Aus der DE-OS 32 13 434 und der EP-A1 0 093 869 sind Ver fahren zur Herstellung individuell angepaßter Prothesen nebst den verfahrensgemäß hergestellten Implantaten be kannt. From DE-OS 32 13 434 and EP-A1 0093869 United are going to manufacture individually adapted prosthesis together with the process produced according implants be known. Die in den vorstehend genannten Veröffentlichungen beschriebenen Verfahren lassen sich zwar bei Anwendung der Computer-Tomographie oder holographischer Verfahren bzw. der Kernspin-Resonanztechnik mit Computerhilfe weitgehend automatisieren und unter industriell günstigen Gesichts punkten durchführen, sie weisen aber den erheblichen Nach teil auf, daß die verfahrensgemäß hergestellten Implantate nur unter Berücksichtigung der Anatomie einen optimalen Sitz in oder auf einem als Verankerung dienenden Knochen bei Wahrung der Knochenstruktur ermöglichen. The methods described in the above publications can indeed when using the computer tomography or holographic methods and nuclear magnetic resonance technology to automate a large extent with the help of computers and perform points under industrially favorable face, but they have the considerable After part of that process in accordance with only taking into account the anatomy allow implants produced an optimal fit in or on a serving as an anchoring bone while preserving the bone structure. Die für den langfristig sicheren und festen Sitz einer Prothese be deutsame gleichmäßige Belastungsverteilung bleiben unbe rücksichtigt. The be for the long-term safe and secure attachment of a prosthesis interpreting same uniform load distribution remain non taken into account. Dadurch sind Relativbewegungen im Grenzbe reich zwischen Implantat und Knochenmaterial, welche frü her oder später - auch bei normaler Belastung der Prothese - in nachteiliger Weise zu Lockerungserscheinungen in der Prothesenverankerung führen, nicht vermeidbar. This is relative movements in Grenzbe area between the implant and the bone material which bre ago or later - even in normal loading of the prosthesis - lead disadvantageously to easing symptoms in the prosthesis anchoring, unavoidable.

Ausgehend von den Mängeln des Standes der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren der eingangs genannten Gattung zu entwickeln, mit welchem verbesserte Prothesen herstellbar sind, bei denen nach erfolgter Implantation - auch bei starker mechanischer Belastung - eine erheblich geringere Gefahr besteht, daß eine Lockerung in der Verankerung der Prothese eintritt. Based on the deficiencies of the prior art, the invention has for its object to develop a method of the type mentioned, are compatible with which improved prostheses produced in which after implantation - even under strong mechanical load - there is a considerably lower risk of entering an easing in the anchoring of the prosthesis.

Diese Aufgabe wird mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. This object is achieved with the characterizing features of claim 1.

Die Erfindung schließt die Erkenntnis ein, daß an Grenz flächen, an denen aus unterschiedlichen Werkstoffen beste hende Körper aneinanderliegen, dann keine Relativ-Bewe gungen auftreten, wenn die dreidimensionale Elastizitätsver teilung in den einzelnen Körpern in dem betrachteten Be reich im wesentlichen die gleiche Größe aufweist. The invention includes the recognition that surfaces at interfaces at which rest against each other from different materials best rising body, then no relative BEWE conditions occur when the three-dimensional Elastizitätsver distribution in the individual bodies in the considered Be rich essentially the same size comprising ,

Entsprechend der bevorzugten Ausführungsform der Erfindung wird ein Prothesenrohling, welcher in seiner äußeren Form dem für eine Implantation vorbereiteten Markraum des entsprechenden Knochens angepaßt worden ist, einer zusätz lichen Bearbeitung unterzogen, um die Elastizität des Prothesenschaftes längs seiner Achse der räumlichen Ver teilung der Elastizitätswerte anzupassen, welche das den Prothesenschaft umgebende Knochenmaterial im vorgesehenen Implantationsbereich aufweist. According to the preferred embodiment of the invention, a prosthesis blank, which in its outer shape to the prepared for implantation medullary canal of the corresponding bone has been adapted, subjected to zusätz current machining to partition the elasticity of the prosthesis shaft along its axis of the spatial Ver adjust the elasticity values, which comprises the prosthetic socket surrounding bone material in the intended implantation region. Die Bearbeitung der Ober fläche, insbesondere der Mantelfläche des Schafts des Prothesenrohlings erfolgt durch, vorzugsweise spangebenden Materialabtrag. The machining of the upper surface, especially the circumferential surface of the stem of the prosthesis blank is carried out by, preferably chip-removal of material.

Die Daten zur Steuerung des Werkzeugs, welches die Ober fläche des Prothesenrohlings bearbeitet, werden aus den patientenspezifischen Daten über die dreidimensionale Ela stizitätsverteilung in dem Bereich des Knochens, welcher für die entsprechende Implantation vorbereitet worden ist, gewonnen. The data for controlling the tool, which surface, the upper edited of the prosthesis blank, are obtained from the patient-specific data on the three-dimensional Ela stizitätsverteilung in the region of the bone, which has been prepared for the corresponding implantation recovered. Dazu wird ein Computer-Tomogramm des vorgenann ten Knochenbereichs angefertigt, um ua die Knochenbe schaffenheit, die Dichteverteilung und die Wandungsstärke in axialer und radialer Erstreckung zu ermitteln. For this, a CT scan of the vorgenann th bone area is made to include the Knochenbe create beauty, to determine the density distribution and the wall thickness in the axial and radial extent. Diese Werte werden datentechnisch geeignet aufbereitet und einer ersten Rechner-Einheit zur Verfügung gestellt, welche mit einem ersten externen Speicher verbunden ist. These values ​​are technically suitable data processed and made of a first computer unit available, which is connected to a first external memory. Dieser Spei cher enthält als ergänzende Daten die mittleren, insbeson dere altersabhängigen Festigkeitswerte für die möglichen Modifikationen des Knochenmaterials sowie die Berechnungs algorithmen für weitere mechanische Kenngrößen. This mo ry contains, as supplementary data, the middle age dependent in particular resistance values ​​for the possible modifications of the bone material and the calculation algorithms for other mechanical characteristics. Aus dieser insgesamt vorliegenden Datenmenge wird in der ersten Rechner-Einheit die dreidimensionale Elastizitätsvertei lung rechnerisch ermittelt und in den Arbeitsspeicher ei ner zweiten Rechner-Einheit übertragen. Out of this total amount available data the three-dimensional Elastizitätsvertei is lung mathematically calculated and transferred to the main memory egg ner second computer unit in the first computer unit. Mit dieser Rechner-Einheit ist ein zweiter externer Speicher verbun den, in welchem ua die Daten der Raumgeometrie des an atomisch angepaßten Prothesenrohlings, mechanische Kenn werte, wie die Flächenträgheitsmomente einer Vielzahl von Querschnittprofilen und die Festigkeitswerte der für Hüftgelenk-Endoprothesen typischer Materialzusammensetzun gen. Die der zweiten Rechner-Einheit zur Verfügung stehen den Datenmengen werden zur Ermittlung der Kennwerte ver wendet, um eine Steuerung zu aktivieren, welche das Werk zeug zur spanenden Bearbeitung des Prothesenrohlings an treibt. With this computer unit, a second external memory is-jointed, in which, inter alia, values ​​of data on the spatial geometry of the matched to atomically prosthesis blank, mechanical characteristics, as the area moment of inertia of a plurality of cross-sectional profiles and the strength values ​​of typical for hip joint endoprostheses Materialzusammensetzun gene. The the second computer unit available to the data volumes are ver applies for determining the characteristics to enable a controller that drives the work of convincing for machining of the prosthesis blank to.

Die Bearbeitung der Oberfläche des Prothesenschafts des vorgefertigten Rohlings erfolgt derart, daß die räumliche Elastizitätsverteilung im Prothesenschaft und in dem ihn umgebenden Knochenmaterial im wesentlichen die gleiche Größe aufweist, so daß in vorteilhafter Weise im Grenzbe reich zwischen Schaft und Knochen bei mechanischer Bela stung der Prothese keine Relativbewegungen auftreten. The processing of the surface of the prosthesis shaft of the preformed blank is such that substantially the spatial elasticity distribution of the same size in the prosthetic socket and the surrounding bone material so that in an advantageous manner in Grenzbe rich between stem and bone under mechanical loading stung the prosthesis no relative movements occur. Da durch wird eine mit erheblichen Folgeproblemen verbundene Lockerung des Schaftes der implantierten Endoprothese un terbunden. Since by means connected to considerable consequential problems loosening of the stem of the implanted endoprosthesis is un terbunden.

Die Bearbeitung der Oberfläche des im wesentlichen blatt artig ausgebildeten Prothesenschafts erfolgt entsprechend einer vorteilhaften Weiterbildung der Erfindung durch eine numerisch gesteuerte Werkzeugmaschine (CNC-Maschine), wobei sowohl die mediale und laterale Schmalseite des Prothesenschaftes, als auch die nach anterior bzw. nach posterior gerichtete Schaftseite entsprechend den jeweils vorliegenden Bedingungen (Elastizität und Festigkeit des zur Implantation vorbereiteten Knochens) spangebend bearbeitet werden können. The machining of the surface of the substantially sheet-like prosthesis stem is done according to an advantageous development of the invention by a numerically controlled machine tool (CNC) machine, wherein both the medial and lateral narrow side of the prosthesis stem, as well as the directed anteriorly or posteriorly shaft side (elasticity and strength of the prepared bone for implantation) can be processed by machining in accordance with the respectively prevailing conditions. Als Werkzeug ist ein sich zu seiner Spitze hin verjüngender, vorzugsweise kegelförmig ausgebildeter Fräser günstig. As a tool is a down tapered to its tip, preferably conically formed router low. Mit ihm können ohne beson deren Aufwand nutenförmige, sich im wesentlichen parallel zur Schaftachse erstreckende Ausnehmungen oder Profi lierungen auf der Oberfläche des Prothesenschafts erzeugt werden, welche ein im wesentlichen keilförmiges Quer schnittsprofil aufweisen und sich in radialer Richtung verbreitern. With it can be produced on the surface of the prosthesis shaft without any special effort whose groove-shaped, is lierungen parallel to the shaft axis extending recesses or pro substantially having a substantially wedge-shaped cross-section and broadening in the radial direction.

Bei der Anpassung der elastischen Eigenschaften des Prot hesenschaftes hat es sich als besonders günstig erwiesen, im proximalen Schaftbereich auf der lateralen Schmalseite und im distalen Schaftbereich auf der medialen Schmalseite des Prothesenschaftes eine keilförmige Ausnehmung vorzuse hen, welche jeweils nach distal bzw. nach proximal auslau fen, wobei die Tiefe der Ausnehmungen kontinuierlich ab nimmt und die grundsätzliche Form des Prothesenschaftes beibehalten wird. In the adaptation of the elastic properties of the Prot hesenschaftes it has proved to be particularly advantageous in the proximal stem portion on the lateral narrow side and in the distal shaft portion on the medial narrow side of the prosthesis shaft vorzuse a wedge-shaped recess hen which fen respectively distally and proximally auslau wherein the depth of the recesses continuously decreases, and the general shape of the prosthesis stem is retained. Für besondere räumliche Elastizitätsver teilungen kann an Stelle der im proximalen Schaftbereich an der Lateralseite befindlichen Ausnehmung eine Mehrzahl keilförmiger, nach distal auslaufender Nuten vorgesehen werden. a plurality can be used for particular spatial distributions Elastizitätsver be wedge-shaped, provided to the distal end of expiring grooves in place of the recess located on the lateral side in the proximal shaft region.

Die nach anterior bzw. posterior gerichteten Breitseiten des blattartig ausgebildeten Prothesenschaftes werden ver fahrensgemäß mit einer Mehrzahl sich parallel zur Schaft achse und im wesentlichen parallel zueinander erstrecken der Nuten versehen. The facing anterior or posterior broad sides of the sheet-like prosthesis shaft are ver drive according to the axis with a plurality parallel to the shaft and substantially parallel to each of the grooves extend provided. Sie weisen ein keilförmiges Quer schnittsprofil auf und nehmen in Richtung zu den Schmal seiten des Prothesenschaftes in der maximalen Tiefe ab. They have a wedge-shaped cross-sectional profile and take toward the narrow part of the prosthesis shaft in the maximum depth.

Für die Verbesserung der Haftung bzw. des Einwachsens von Knochenmaterial in die Schaftoberfläche ist gemäß einer zusätzlichen Weiterbildung des erfindungsgemäßen Verfah rens günstig, die Schaftoberfläche nach der spangebenden Bearbeitung anzurauhen. For improving the adhesion and ingrowth of bone material in the shaft surface in accordance with an additional development of the invention is procedural proceedings favorable to roughen the shaft surface after chip machining. Besondere Vorteile sind in dieser Hinsicht bei madreporierten Oberflächen zu erwarten. Particular advantages are to be expected in this regard in madreporierten surfaces.

Vorteilhafte Weiterbildungen der Erfindung sind in den Un teransprüchen gekennzeichnet bzw. werden nachstehend zusammen mit der Beschreibung der bevorzugten Ausführung der Erfindung anhand der Figuren näher dargestellt. Advantageous developments of the invention are characterized in dependent claims the Un and will be described in more detail below together with the description of the preferred embodiments of the invention with reference to FIGS. Es zeigen: Show it:

Fig. 1 eine schematische Darstellung eines verfahrens gemäß zu bearbeitenden Prothesenrohlings in Ansicht von der Seite, Fig. 1 is a schematic representation of a prosthesis blank to be processed according to the method in view from the side,

Fig. 2 die schematische Darstellung der Ansicht eines Schnittes längs der Linie A . Fig. 2 is a schematic representation of a sectional view taken along the line A. . , . , A in Fig. 1 bei der bevor zugten Ausführungsform des erfindungsgemäß bearbeiteten Prothesenrohlings, A in Fig. 1 in the before ferred embodiment of the inventive machined prosthesis blank,

Fig. 3 die schematische Darstellung der Ansicht eines Schnittes längs der Linie A . Fig. 3 is a schematic representation of a sectional view taken along the line A. . , . , A in Fig. 1 bei einem in einer anderen vorteilhaften Ausführungsform des erfin dungsgemäß bearbeiteten Prothesenrohlings, A in Fig. 1, in one, in another advantageous embodiment of the dung OF INVENTION machined according prosthesis blank

Fig. 4 die schematische Darstellung der Ansicht eines Schnittes längs der Linie B . Fig. 4 is a schematic representation of a sectional view taken along the line B. . , . , B in Fig. 1 bei der bevor zugten Ausführungsform des erfindungsgemäß bearbeiteten Prothesenrohlings, B in Fig. 1 in the before ferred embodiment of the inventive machined prosthesis blank,

Fig. 5 die schematische Darstellung der Ansicht eines Schnittes längs der Linie C . Fig. 5 is a schematic representation of a sectional view taken along the line C. . , . , C in Fig. 1 bei der bevor zugten Ausführungsform des erfindungsgemäß bearbeiteten Prothesenrohlings sowie . C in Figure 1, in the prior ferred embodiment of the inventive machined prosthesis blank and

Fig. 6 die schematisierte Darstellung einer vorteilhaf ten Ausführungsform einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens. Fig. 6 shows the schematic representation of a vorteilhaf th embodiment of an apparatus for performing the method according to the invention.

Fig. 1 zeigt einen Prothesenrohling 1 in Ansicht von der Seite, welcher einen Prothesenhals 3 mit einer Längsachse 5 und einen sich nach distal verjüngenden, leicht geboge nen Prothesenschaft 2 mit einer Längsachse 4 aufweist. Fig. 1 shows a prosthesis blank 1 in side view, having a prosthesis neck 3 with a longitudinal axis 5 and a tapered distally slightly curv NEN prosthesis shaft 2 having a longitudinal axis 4. Dieser Prothesenrohling 1 ist durch mechanische Bear beitung in seinen äußeren Abmessungen, insbesondere die des Prothesenschaftes, an die anatomischen Gegebenheiten des für eine Implantation vorbereiteten Knochenabschnitts angepaßt. This prosthesis blank 1 is formed by mechanical processing Bear in its external dimensions, in particular the stem of the prosthesis, adapted to the anatomical conditions of the prepared for implantation bone portion. Die im wesentlichen glatten Oberflächen des distalen Bereichs 2.1 , des mittleren Abschnitts 2.2 und des proximalen Bereichs 2.3 des Prothesenschaftes 2 werden durch spangebende Weiterbearbeitung derart profiliert, daß die dreidimensionale Elastizitätsverteilung im Schaft des Prothesenrohlings in längs seiner Achse 4 der Elastizi tätsverteilung in dem zur Implantation vorbereiteten Knochenabschnitt entspricht. The substantially smooth surface of the distal portion 2.1 of the central section 2.2 and the proximal portion 2.3 of the prosthesis stem 2 are profiled by metal-removing further processing such that the three-dimensional elasticity distribution tätsverteilung in the shank of the prosthesis blank in along its axis 4 of the Elastizi prepared in the implantation bone section corresponds.

Die Schnittdarstellung gemäß Fig. 2 zeigt schematisiert das Querschnittsprofil im proximalen Bereich 2.3 des im wesentlichen blattartig ausgebildeten Schaftes der Prothese 1 . The sectional view of FIG. 2 schematically shows the cross-sectional profile in the proximal region 2.3 of the substantially sheet-like stem of the prosthesis 1. Die mediale Schmalseite 6 weist eine glatte Oberfläche auf, wogegen die laterale Schmalseite 9 des Schaftbereiches 2.3 mit einer Ausnehmung 7 versehen ist. The medial narrow side 6 has a smooth surface, whereas the lateral narrow side of the shaft portion is provided with a recess 7 2.3. 9 Die Ausnehmung 7 ist in herstellungsgünstiger Weise keilförmig ausgebildet. The recess 7 is wedge-shaped in making effective manner. Sie erstreckt sich in Richtung der Schaftachse und nimmt in der Tiefe von proximal nach distal kontinuierlich ab. It extends in the direction of the shaft axis and increases in depth from proximal to distal continuously.

In Anpassung an eine andere dreidimensionale Elastizitäts verteilung im Knochen wird gemäß Fig. 3 an der lateralen Schmalseite im proximalen Schaftbereich 2.3 der Prothese 1 eine Profilierung mit mehreren, im wesentlichen keilförmig ausgebildeten Ausnehmungen 10 eingearbeitet. In adaptation to a different three-dimensional elasticity distribution in the bone is incorporated in FIG. 3 on the lateral narrow side of the proximal shaft portion 2.3 of the prosthesis 1 has a profiling with a plurality of substantially wedge-shaped recesses 10. Die Ausneh mungen 10 nehmen in der Tiefe von proximal nach distal kontinuierlich ab und erstrecken sich - parallel neben einanderliegend - nahezu parallel zur Achse des Prothe senschaftes. The Ausneh rules 10 take in the depth from proximal to distal continuously and extend - in parallel next to one another - almost parallel to the axis of the prosthetic senschaftes. Je nach der erforderlichen dreidimensionalen Elastizitätsverteilung weist das anfängliche Tiefenmaß der einzelnen Ausnehmungen eine unterschiedliche Größe auf. Depending on the required three-dimensional elasticity distribution, the initial depth of the individual recesses differ in size.

Eine mögliche Gestaltung der nach anterior bzw. nach posterior weisenden Seiten der Schaftoberfläche in dem zwischen dem distalen Bereich 2.1 und dem proximalen Bereich 2.3 befindlichen Schaftabschnitt 2.2 ist in Fig. 4 als Ansicht eines Schnittes längs der Linie B . A possible design of the facing anterior or posterior sides of the stem surface in which is located between the distal region and the proximal region 2.1 2.3 2.2 shaft portion in FIG. 4 as a sectional view taken along the line B. . , . , B gemäß Fig. 1 schematisch dargestellt. B of FIG. 1 shown schematically. Sowohl die mediale als auch die laterale Schmalseite 6 , 9 des mittleren Schaftabschnittes 2.2 weisen eine glatte Oberfläche auf. Both the medial and lateral narrow side 6, 9 of the central shaft section 2.2 have a smooth surface. Die nach posterior und nach anterior weisende Schaft seite ist jeweils mit einer Profilierung aus mehreren, keilförmig ausgebildeten Ausnehmungen 11 , deren Tiefe von medial nach lateral zuerst zu- und dann wieder abnimmt. The facing posteriorly and anteriorly shaft side is in each case with a profile from a plurality of wedge-shaped recesses 11, the depth of the medial first increases and then decreases again laterally. Die Ausnehmungen 11 erstrecken sich - parallel - im we sentlichen in Richtung der Schaftachse und nehmen sowohl nach distal als auch nach proximal in ihrer Tiefe konti nuierlich ab. The recesses 11 extend - in parallel - in we sentlichen in the direction of the shaft axis and be both distally and proximally in depth continu ously from.

Fig. 5 zeigt als Ansicht eines Schnittes längs der Linie C . Fig. 5 shows, as a sectional view taken along the line C. . , . , C gemäß Fig. 1 das Querschnittsprofil des distalen Schaftabschnitts 2.1 der Prothese 1 . . C of Figure 1, the cross-sectional profile of the distal shaft section 2.1 of the prosthesis 1. Zur Anpassung an die notwendige Elastizitätsverteilung ist bei glatter Oberflä che an der lateralen Schmalseite 9 an der medialen Schmal seite 6 eine keilförmige Ausnehmung 8 eingearbeitet. To adapt to the necessary elasticity distribution of a wedge-shaped recess 8 is incorporated with a smooth surface Oberflä on the lateral narrow side 9 on the medial narrow side. 6 Die Ausnehmung 8 läuft nach proximal aus, wobei ihre Tiefe kontinuierlich abnimmt. The recess 8 is running from proximal to, and their depth decreases continuously.

Die in Fig. 6 als Blockschaltbild schematisiert dar gestellte Vorrichtung zur Herstellung von einer in ihrer dreidimensionalen Elastizitätsverteilung an den zur Im plantation vorgesehenen Knochenbereich 13 angepaßte Hüftgelenk-Endoprothese 1 weist eine elektronische Ein richtung 12 , vorzugsweise Computer-Tomograph, zur dreidi mensionalen Erfassung der Struktur, Dichte und Verteilung der Knochensubstanz in einem für die Implantation einer Prothese vorgesehenen Bereich des Knochens 13 auf. Shown in Fig. 6 schematically as a block diagram is asked apparatus for producing a three-dimensional in its elasticity distribution to the designated for the plantation bone portion 13 adapted hip-joint endoprosthesis 1 has an electronic a device 12, preferably computer-tomograph, dimensional to dreidi detection of the structure , density and distribution of the bone substance in an intended for implantation of a prosthesis region of the bone 13. Sie en thält eine Strahlungsquelle 22 und eine entsprechende Empfangseinrichtung 21 und einen Wandler 20 , um die Meß daten verarbeitungsgerecht in eine erste Rechner-Einheit 17 für die Verarbeitung der durch die Einrichtung 12 er mittelten Daten und der aus einem ersten Speicher 19 ver fügbaren Daten über Festigkeitskennwerte der möglichen Knochensubstanzen zwecks Ermittlung der dreidimensionalen Elastizitätsverteilung im Knochens 13 innerhalb des Implantationsbereichs einspeisen zu können. It con tains a radiation source 22 and a corresponding receiving device 21 and a converter 20 to the measuring in a first computer unit 17 for processing by the means 12, he mediated data and the ver from a first memory 19 available data on data processing meet strength characteristics of the possible bone substances can be fed in the bone 13 within the implantation region in order to determine the three-dimensional elasticity distribution.

Die erfindungsgemäße Vorrichtung weist darüber hinaus eine zweite Rechner-Einheit 16 zur Ermittlung der Steuerungs- Kennwerte für eine CNC-Werkzeugmaschine 23 auf. The inventive device further has a second computer unit 16 to determine the control parameters for a CNC machine tool 23rd Hier wer den die von der ersten Rechner-Einheit 17 ermittelten Da tenmengen und die in einem zweiten Speicher 18 vorhandenen Datenmengen über die Raumgeometrie eines anatomisch ange paßten Prothesenrohlings, mechanische Kennwerte, wie die Flächenträgheitsmomente einer Vielzahl von Querschnitts profilen und die Festigkeitswerte der für Hüftgelenk- Endoprothesen typischer Materialzusammensetzungen verar beitet, um die spangebende Bearbeitung des anatomisch an gepaßten Prothesenrohlings 1 vornehmen zu können. Here who which the ascertained by the first computer unit 17, since tenmengen and existing in a second memory 18 amounts of data about the spatial geometry of an anatomically fitted prosthesis blank, mechanical characteristics, such as profiles, the geometrical moments of inertia of a plurality of cross-section and the strength values of for hip joint Implants typical material compositions beitet verar to use in cutting to make anatomically fitted to the prosthesis blank one. Die Steuerung 15 koordiniert die dreidimensionalen Schrittbe wegungen einer Fräs-Einrichtung 14 , deren Fräser 14 ′ kegel- oder keilförmig ausgebildet ist. The controller 15 coordinates the three-dimensional movements Schrittbe a milling device 14, the router 14 conical 'or is wedge-shaped. Dadurch ist ohne zusätzliche Vorkehrungen eine mehrstufige Bearbeitung der Schaftoberfläche der Prothese 1 möglich. This multi-stage processing of the stem surface of the prosthesis 1 is possible without additional precautions.

Durch die vielseitigen Gestaltungsmöglichkeiten des Prot hesenschaftes mittels spanabgebender Bearbeitung der late ralen, der medialen, der nach anterior bzw. nach posterior weisenden Seitenfläche des Prothesenschaftes ist die drei dimensionale Elastizitätsverteilung längs des Schaftes der Prothese in vorteilhafter Weise an die entsprechenden lokalen Elastizitätswerte im Material der Wandung des zur Implantation ausgewählten Knochenbereiches weitestgehend anpaßbar, wodurch ein langjähriger fester Sitz des Implan tats im Knochen wegen der nahezu vollständigen Unterdrückung von Relativbewegungen im Grenzbereich zwischen Im plantat und Knochen bei normaler Belastung der Prothese gewährleistet. By the versatile design possibilities of Prot hesenschaftes means spanabgebender processing of late eral, the medial, the anteriorly and posteriorly facing side surface of the prosthesis shaft is the three-dimensional elasticity distribution along the shaft of the prosthesis in an advantageous manner to the respective local elasticity values ​​in the material of the wall the largely adapted for implantation selected bone area, creating a long-term fixed seat of Implan Plantat tats in the bone because of the almost complete suppression of relative movements in the border area between the bone and guarantees for normal load of the prosthesis.

Die Erfindung beschränkt sich in ihrer Ausführung nicht auf das vorstehend angegebene bevorzugte Ausführungsbei spiel. The invention is not limited in its embodiment to the above-described preferred Ausführungsbei game. Vielmehr ist eine Anzahl von Varianten denkbar, welche von der dargestellten Lösung auch bei grundsätzlich anders gearteten Ausführungen Gebrauch macht. Rather, a number of variants which make use of the described solution even for basically different configurations.

Claims (14)

  1. 1. Verfahren zur Herstellung einer in einen Knochen hohlraum einfügbaren, gebogenen und sich bezüglich Durch messer und Materialquerschnitt nach distal verjüngenden Hüftgelenk-Endoprothese aus einem Prothesen-Rohling unter individueller Anpassung an die Form des zur Implantation vorbereiteten Markraums des Knochens mittels spangebender Bearbeitung, dadurch gekennzeichnet, daß zusätzlich in ebenfalls spangebender Bearbeitung eine profil- oder lokale Ausnehmungen erzeugende Oberflächen bearbeitung derart vorgenommen wird, daß die Elastizität des Prothesenschaftes ( 2 ) im in den Knochen einzufügenden Bereich im wesentlichen an die Elastizität des benachbar ten Knochens ( 13 ) angepaßt ist. 1. A process for the preparation of a insertable into a bone cavity, bent and with respect to diameter and material cross-section distally hip-joint endoprosthesis tapered from a prosthesis blank with individual adaptation to the shape of the prepared for implantation medullary canal of the bone by chip machining, characterized in that that, in addition, also in chip machining a profile or local recesses forming surfaces is processing performed such that the elasticity of the prosthesis shaft (2) is inserted into the bone portion is substantially on the elasticity of the benachbar th bone (13) is adapted.
  2. 2. Verfahren nach Anspruch 1, dadurch ge kennzeichnet, daß die Bearbeitung durch eine Vorrichtung ( 23 ) mit einem Werkzeugs ( 14 ′) erfolgt, dessen räumliche Bewegungskoordinaten mittels 2. The method according to claim 1, characterized in that the processing by a device (23) with a tool (14 ') takes place, the spatial movement coordinates by means of
    • - Computer-Tomographie - Computed Tomography
    • - Multiplex-Holographie und/oder - multiplex holography and / or
    • - Kernspin-Resonanz-Tomographie - magnetic resonance imaging
  3. gewonnenen dreidimensionalen Elastizitäts-Verteilung im Knochen ( 13 ) im Implantationsbereich abgeleitet werden. obtained three-dimensional elasticity distribution in the bone (13) are derived in the implantation region.
  4. 3. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der erforderliche Elastizitätsverlauf längs der Achse ( 4 ) des Prothesenschaftes ( 2 ) durch das Einbringen von Profi lierungen ( 10 , 11 ) und/oder Ausnehmungen ( 7 , 8 ) erzeugt wird. 3. The method according to any one of the preceding claims, characterized in that the required elasticity curve along the axis (4) of the prosthesis shaft (2) by the introduction of professional lierungen (10, 11) and / or recesses (7, 8) is generated.
  5. 4. Verfahren nach Anspruch 3, dadurch ge kennzeichnet, daß der Prothesenschaft ( 2 ) am proximalen Ende ( 2.3 ) an der lateralen Schmalseite ( 9 ) und am distalen Ende ( 2.1 ) an der medialen Schmalseite ( 6 ) mit einer im wesentlichen V-förmig ausgebildeten Ausnehmung ( 7 bzw. 8 ) versehen wird. 4. The method according to claim 3, characterized in that the prosthesis shaft (2) at the proximal end (2.3) on the lateral narrow side (9) and the distal end (2.1) on the medial narrow side (6) with a substantially V- -shaped recess (7 or 8) is provided.
  6. 5. Verfahren nach Anspruch 4, dadurch ge kennzeichnet, daß die Tiefe der proximal angeordneten Ausnehmung ( 7 ) nach distal und die Tiefe der distal angeordneten Ausnehmung ( 8 ) nach proximal abnimmt. 5. The method according to claim 4, characterized in that the depth of proximally arranged recess (7) in the distal direction and the depth of the distally disposed opening (8) decreases in the proximal direction.
  7. 6. Verfahren nach Anspruch 5, dadurch ge kennzeichnet, daß die Tiefe der Ausnehmung sich im wesentlichen kontinuierlich vermindert. 6. The method according to claim 5, characterized in that the depth of the recess continuously reduced substantially.
  8. 7. Verfahren nach einem der Ansprüche 3 bis 6, da durch gekennzeichnet, daß die mecha nische Bearbeitung des Prothesenrohling ( 1 ) in mehreren Schritten nacheinander durchgeführt wird. 7. A method according to any one of claims 3 to 6, as characterized by that the mechanical processing of the American prosthesis blank (1) is carried out in several steps sequentially.
  9. 8. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Prothesenschaft ( 2 ) nach der spangebenden Bearbeitung einer zusätzlichen Oberflächenbehandlung unterzogen wird. 8. The method according to any one of the preceding claims, characterized in that the prosthesis shaft (2) is subjected to the cutting machining an additional surface treatment.
  10. 9. Verfahren nach Anspruch 8, dadurch ge kennzeichnet, daß die Schaftoberfläche madre poriert wird. 9. The method according to claim 8, characterized in that the stem surface Madre is porated.
  11. 10. Vorrichtung zur Durchführung des Verfahrens nach ei nem der vorangehenden Ansprüche, 10. A device for performing the method according ei nem of the preceding claims,
    gekennzeichnet durch marked by
    • - eine elektronische Einrichtung ( 12 ), vorzugsweise Computer-Tomograph, zur dreidimensionalen Erfassung der Struktur, Dichte und Verteilung der Knochen substanz in einem für die Implantation einer Prothese vorgesehenen Bereich eines Knochens ( 13 ), - an electronic device (12), preferably computer-tomograph, for three-dimensional measurement of the structure, density and distribution of the bone substance in an intended for implantation of a prosthesis region of a bone (13),
    • - eine erste Einheit ( 17 ) für eine Verarbeitung der durch die Einrichtung ( 12 ) ermittelten Daten und der aus einem ersten Speicher ( 19 ) verfügbaren Daten über Festigkeitskennwerte der möglichen Knochensubstanzen zwecks Ermittlung der dreidimensionalen Elastizitäts verteilung im Knochens ( 13 ) innerhalb des Implan tationsbereichs, - a first unit (17) available for processing by the device (12) data determined and from a first memory (19) data on strength characteristics of the possible bone substances for the purpose of determining the three-dimensional elasticity distribution in the bone (13) within the Implan tationsbereichs .
    • - eine zweite Einheit ( 16 ) zur Ermittlung der Steuerungs-Kennwerte für das Werkzeug ( 14 ′) einer Vorrichtung ( 23 ) zur spanenden Bearbeitung eines ana tomisch angepaßten Prothesenrohlings ( 1 ), welche die von der ersten Rechner-Einheit ( 17 ) ermittelten Datenmengen und die in einem zweiten Speicher ( 18 ) vorhandenen Datenmengen über die Raumgeometrie des anatomisch angepaßten Prothesenrohlings, mechanische Kennwerte, wie die Flächenträgheitsmomente einer Vielzahl von Querschnittprofilen und die Festig keitswerte der für Hüftgelenk-Endoprothesen typischer Materialzusammensetzungen verarbeitet und - a second unit (16) for determining the control parameters for the tool (14 ') of a device (23) for machining a ana Tomisch matched prosthesis blank (1) which of the first computer unit (17) determined amounts of data the processed and in a second memory (18) existing amounts of data about the spatial geometry of the anatomically adapted prosthesis blank, mechanical characteristics, as the area moment of inertia of a plurality of cross-sectional profiles and the Festig speed values for hip joint endoprostheses typical material compositions and
    • - eine Anordnung ( 23 ) mit einem Werkzeug ( 14 ) nebst dazugehöriger Steuerung ( 15 ) zur mechanischen Bear beitung des Prothesenrohlings ( 1 ). - an arrangement (23) with a tool (14) together with the related control unit (15) for mechanical processing Bear of the prosthesis blank (1).
  12. 11. Vorrichtung nach Anspruch 10, dadurch ge kennzeichnet, daß als Bearbeitungs- Einrichtung ( 23 ) eine CNC-Werkzeugmaschine vorgesehen ist. 11. The device according to claim 10, characterized in that there is provided as a processing device (23) is a CNC machine tool.
  13. 12. Vorrichtung nach Anspruch 11, dadurch ge kennzeichnet, daß die CNC-Maschine ( 23 ) eine Fräs-Einrichtung ( 14 ) aufweist. 12. The apparatus according to claim 11, characterized in that the CNC machine (23) comprises a milling device (14).
  14. 13. Vorrichtung nach Anspruch 12, dadurch ge kennzeichnet, daß der Fräser ( 14 ′) kegel- oder keilförmig ausgebildet ist. 13. The apparatus according to claim 12, characterized in that the mill (14 ') is conical or wedge-shaped.
DE19944421153 1994-06-10 1994-06-10 Prodn. of hip joint endoprosthesis insertable in bone cavity of patient Ceased DE4421153A1 (en)

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