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

Info

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
Germany
Prior art keywords
bone
prosthesis
machining
elasticity
blank
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 Deutschland GmbH
Original Assignee
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
Application filed by ARTOS MED PRODUKTE filed Critical ARTOS MED PRODUKTE
Priority to DE19944421153 priority Critical patent/DE4421153A1/en
Publication of DE4421153A1 publication Critical patent/DE4421153A1/en
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/42—Recording 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
    • G05B19/4202—Recording 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
    • G05B19/4207—Recording 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
    • 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
    • A61F2/3094—Designing or manufacturing processes
    • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
    • 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/3672—Intermediate 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/3676—Distal or diaphyseal 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
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30125—Rounded shapes, e.g. with rounded corners elliptical or oval
    • 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
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30131—Rounded shapes, e.g. with rounded corners horseshoe- or crescent- or C-shaped or U-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
    • 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
    • A61F2002/3082—Grooves
    • A61F2002/30827—Plurality of grooves
    • A61F2002/30828—Plurality of grooves parallel
    • 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
    • A61F2002/30879—Ribs
    • 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
    • A61F2/3094—Designing or manufacturing processes
    • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
    • A61F2002/30952—Designing 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
    • 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
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0008—Rounded shapes, e.g. with rounded corners elliptical or oval
    • 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
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0013—Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/45—Nc applications
    • G05B2219/45145—Milling
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/45—Nc applications
    • G05B2219/45166—Tomography
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/45—Nc applications
    • G05B2219/45168—Bone 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 in the preamble of claim 1 specified type and refers to the Making an individual, multidimensional shape tend stem 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. 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. Die für den langfristig sicheren und festen Sitz einer Prothese be­ deutsame gleichmäßige Belastungsverteilung bleiben unbe­ rücksichtigt. 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.From DE-OS 32 13 434 and EP-A1 0 093 869 Ver drive to the manufacture of customized prostheses in addition to the implants manufactured in accordance with the method knows. The in the above publications described methods can be applied using the Computer tomography or holographic processes or the nuclear magnetic resonance technology with computer help largely automate and under industrially favorable face perform points, but they show considerable evidence part on that the implants manufactured according to the method an optimal one only taking anatomy into account Seat in or on an anchoring bone allow while preserving the bone structure. The one for the long-term secure and firm fit of a prosthesis significant, even load distribution remains unaffected considered. As a result, there are relative movements in the Grenzbe rich between implant and bone material, which early sooner or later - even with normal loading of the prosthesis - in a disadvantageous manner to loosening in the Lead prosthesis anchorage, 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 shortcomings of the prior art the invention has for its object a method of to develop the type mentioned at the beginning, with which improved prostheses can be produced, in which after successful implantation - even with strong mechanical ones Burden - there is a significantly lower risk that loosening occurs in the anchoring of the prosthesis.

Diese Aufgabe wird mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. This task is carried out with the characteristic features of the Claim 1 solved.  

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 finding that at the limit surfaces where the best from different materials bodies lying next to each other, then no relative movement conditions occur when the three-dimensional elasticity ver division in the individual bodies in the considered subject rich is essentially the same size.

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. Die Bearbeitung der Ober­ fläche, insbesondere der Mantelfläche des Schafts des Prothesenrohlings erfolgt durch, vorzugsweise spangebenden Materialabtrag.According to the preferred embodiment of the invention becomes a prosthesis blank, which in its outer form the medullary canal prepared for implantation appropriate bone has been adjusted, an additional lichen processing to ensure the elasticity of the Prosthesis shaft along its axis of spatial ver adjust the division of the elasticity values, which the Bone material surrounding the prosthesis shaft in the intended Has implantation area. Editing the waiter area, in particular the lateral surface of the shaft of the Prosthetic blanks are made by, preferably cutting Material removal.

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. Dazu wird ein Computer-Tomogramm des vorgenann­ ten Knochenbereichs angefertigt, um u. a. die Knochenbe­ schaffenheit, die Dichteverteilung und die Wandungsstärke in axialer und radialer Erstreckung zu ermitteln. Diese Werte werden datentechnisch geeignet aufbereitet und einer ersten Rechner-Einheit zur Verfügung gestellt, welche mit einem ersten externen Speicher verbunden ist. 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. 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. Mit dieser Rechner-Einheit ist ein zweiter externer Speicher verbun­ den, in welchem u. a. 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.The data for the control of the tool, which the Ober surface of the prosthesis blank are machined from the patient-specific data about the three-dimensional Ela distribution of strength in the area of the bone which has been prepared for the corresponding implantation, won. A computer tomogram of the above is used for this th bone area made to u. a. the bone bone quality, the density distribution and the wall thickness to be determined in axial and radial extension. These Values are prepared in a technically suitable manner and one first computer unit provided, which with  a first external memory is connected. That spit cher contains the middle data, in particular, as additional data their age-dependent strength values for the possible Modifications of the bone material as well as the calculation algorithms for further mechanical parameters. From this total amount of data available is in the first Computer unit the three-dimensional elasticity distribution tion calculated and in the working memory ner second computer unit transmitted. With this Computer unit is connected to a second external memory the one in which u. a. the data of the room geometry of the atomically adapted prosthesis blank, mechanical characteristics values like the area moments of inertia of a variety of Cross section profiles and the strength values of the for Hip joint endoprostheses of typical material composition gen. Which are available to the second computer unit the data volumes are used to determine the characteristic values turns to activate a controller that works witness to the machining of the prosthesis blank drives.

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. Da­ durch wird eine mit erheblichen Folgeproblemen verbundene Lockerung des Schaftes der implantierten Endoprothese un­ terbunden. Machining the surface of the prosthetic socket prefabricated blank is made in such a way that the spatial Distribution of elasticity in and in the prosthesis socket surrounding bone material is essentially the same Size has, so that advantageously in the Grenzbe rich between shaft and bone in mechanical bela Prosthesis no relative movements occur. There through is associated with considerable consequential problems Loosening of the shaft of the implanted endoprosthesis connected.  

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. Als Werkzeug ist ein sich zu seiner Spitze hin verjüngender, vorzugsweise kegelförmig ausgebildeter Fräser günstig. 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.Machining the surface of the essentially sheet well-formed prosthetic socket is made accordingly an advantageous development of the invention by numerically controlled machine tool (CNC machine), with both the medial and lateral narrow side of the Prosthesis shaft, as well as the anterior or the posterior directed shaft side according to the respective existing conditions (elasticity and strength of the prepared for implantation of bone) can be edited. As a tool one is too its tip tapering, preferably conical trained router cheap. With him you can without special their effort is groove-shaped, essentially parallel Recesses extending to the shaft axis or professional generated on the surface of the prosthesis socket which is a substantially wedge-shaped cross Have sectional profile and in the radial direction widen.

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. 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. When adjusting the elastic properties of the prot it has proven to be particularly favorable in the proximal shaft area on the lateral narrow side and in the distal shaft area on the medial narrow side Vorzeuse the prosthesis socket a wedge-shaped recess hen, which expire distally or proximally fen, the depth of the recesses continuously decreasing takes and the basic form of the prosthetic socket is maintained. For special spatial elasticity ver Divisions can take the place of those in the proximal shaft area a plurality on the lateral side recess wedge-shaped, distal grooves provided become.  

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. Sie weisen ein keilförmiges Quer­ schnittsprofil auf und nehmen in Richtung zu den Schmal­ seiten des Prothesenschaftes in der maximalen Tiefe ab.The broad sides facing anterior or posterior of the leaf-like prosthesis stem are ver according to driving with a plurality parallel to the shaft extend axis and substantially parallel to each other of the grooves. They have a wedge-shaped cross section profile and take towards the narrow sides of the prosthetic socket 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. Besondere Vorteile sind in dieser Hinsicht bei madreporierten Oberflächen zu erwarten.To improve the liability or ingrowth of Bone material in the shaft surface is according to one additional development of the method according to the invention rens cheap, the shaft surface after the cutting Roughing up processing. There are special advantages in this With regard to madreporated surfaces to be expected.

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. Es zeigen:Advantageous developments of the invention are in the Un claims are identified below along with the description of the preferred embodiment the invention with reference to the figures. It demonstrate:

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

Fig. 2 die schematische Darstellung der Ansicht eines Schnittes längs der Linie A . . . A in Fig. 1 bei der bevor­ zugten Ausführungsform des erfindungsgemäß bearbeiteten Prothesenrohlings, Fig. 2 is a schematic representation of the view of a section along the line A. . . A in Fig. 1 in the preferred embodiment of the prosthesis blank machined according to the invention,

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

Fig. 4 die schematische Darstellung der Ansicht eines Schnittes längs der Linie B . . . B in Fig. 1 bei der bevor­ zugten Ausführungsform des erfindungsgemäß bearbeiteten Prothesenrohlings, Fig. 4 is a schematic representation of the view of a section along the line B. . . B in Fig. 1 in the preferred embodiment of the prosthesis blank machined according to the invention,

Fig. 5 die schematische Darstellung der Ansicht eines Schnittes längs der Linie C . . . C in Fig. 1 bei der bevor­ zugten Ausführungsform des erfindungsgemäß bearbeiteten Prothesenrohlings sowie Fig. 5 is a schematic representation of the view of a section along the line C. . . C in Fig. 1 in the preferred embodiment of the prosthesis blank machined according to the invention and

Fig. 6 die schematisierte Darstellung einer vorteilhaf­ ten Ausführungsform einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens. Fig. 6 shows the schematic representation of an advantageous 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. 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. 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. Fig. 1 shows a prosthesis blank 1 in a view from the side, which has a prosthesis neck 3 with a longitudinal axis 5 and a distally tapering, slightly curved prosthesis shaft 2 with a longitudinal axis 4 . This prosthesis blank 1 is mechanically processed in its outer dimensions, in particular that of the prosthesis socket, to the anatomical conditions of the bone section prepared for implantation. The substantially smooth surfaces of the distal region 2.1 , the middle section 2.2 and the proximal region 2.3 of the prosthesis socket 2 are profiled by further machining in such a way that the three-dimensional distribution of elasticity in the shaft of the prosthesis blank is distributed along its axis 4 of the elasticity in the preparation for implantation Bone segment corresponds.

Die Schnittdarstellung gemäß Fig. 2 zeigt schematisiert das Querschnittsprofil im proximalen Bereich 2.3 des im wesentlichen blattartig ausgebildeten Schaftes der Prothese 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. Die Ausnehmung 7 ist in herstellungsgünstiger Weise keilförmig ausgebildet. Sie erstreckt sich in Richtung der Schaftachse und nimmt in der Tiefe von proximal nach distal kontinuierlich ab.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. The medial narrow side 6 has a smooth surface, whereas the lateral narrow side 9 of the shaft area 2.3 is provided with a recess 7 . The recess 7 is wedge-shaped in a manner favorable to manufacture. It extends in the direction of the shaft axis and decreases continuously in depth from proximal to distal.

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. 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. Je nach der erforderlichen dreidimensionalen Elastizitätsverteilung weist das anfängliche Tiefenmaß der einzelnen Ausnehmungen eine unterschiedliche Größe auf.In adaptation to another three-dimensional distribution of elasticity in the bone, a profiling with a plurality of substantially wedge-shaped recesses 10 is incorporated on the lateral narrow side in the proximal shaft region 2.3 of the prosthesis 1 according to FIG. 3. The Ausneh mungen 10 decrease in depth from proximal to distal and extend - parallel next to each other - almost parallel to the axis of the prosthesis. Depending on the required three-dimensional distribution of elasticity, the initial depth dimension of the individual recesses has a different 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 . . . B gemäß Fig. 1 schematisch dargestellt. Sowohl die mediale als auch die laterale Schmalseite 6, 9 des mittleren Schaftabschnittes 2.2 weisen eine glatte Oberfläche auf. 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. 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.A possible configuration of the anterior or posterior-facing sides of the shaft surface in the shaft section 2.2 located between the distal region 2.1 and the proximal region 2.3 is shown in FIG. 4 as a view of a section along the line B. . . B shown schematically in FIG. 1. Both the medial and the lateral narrow side 6 , 9 of the middle shaft section 2.2 have a smooth surface. The posterior and anterior shaft side is each with a profile of several, wedge-shaped recesses 11 , the depth of which increases from medial to lateral and then decreases again. The recesses 11 extend - parallel - essentially in the direction of the shaft axis and continuously decrease in depth both distally and proximally.

Fig. 5 zeigt als Ansicht eines Schnittes längs der Linie C . . . C gemäß Fig. 1 das Querschnittsprofil des distalen Schaftabschnitts 2.1 der Prothese 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. Die Ausnehmung 8 läuft nach proximal aus, wobei ihre Tiefe kontinuierlich abnimmt. Fig. 5 shows a view of a section along the line C. . . C of FIG. 1, the cross-sectional profile of the distal shaft section 2.1 of the prosthesis 1. To adapt to the necessary distribution of elasticity, a wedge-shaped recess 8 is incorporated in the smooth narrow surface on the lateral narrow side 9 on the medial narrow side 6 . The recess 8 runs out proximally, its depth decreasing 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. 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.The device schematically shown in FIG. 6 as a block diagram for producing a hip joint endoprosthesis 1 adapted in its three-dimensional distribution of elasticity to the bone region 13 provided for implantation has an electronic device 12 , preferably a computer tomograph, for three-dimensional detection of the structure , Density and distribution of the bone substance in a region of the bone 13 provided for the implantation of a prosthesis. It contains a radiation source 22 and a corresponding receiving device 21 and a converter 20 in order to process the measurement data in a first computer unit 17 for processing the data determined by the device 12 and the data available from a first memory 19 To be able to feed in strength values of the possible bone substances for the purpose of determining the three-dimensional distribution of elasticity in the bone 13 within the implantation area.

Die erfindungsgemäße Vorrichtung weist darüber hinaus eine zweite Rechner-Einheit 16 zur Ermittlung der Steuerungs- Kennwerte für eine CNC-Werkzeugmaschine 23 auf. 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. Die Steuerung 15 koordiniert die dreidimensionalen Schrittbe­ wegungen einer Fräs-Einrichtung 14, deren Fräser 14′ kegel- oder keilförmig ausgebildet ist. Dadurch ist ohne zusätzliche Vorkehrungen eine mehrstufige Bearbeitung der Schaftoberfläche der Prothese 1 möglich.The device according to the invention also has a second computer unit 16 for determining the control characteristic values for a CNC machine tool 23 . Here, the data quantities determined by the first computer unit 17 and the data quantities available in a second memory 18 about the spatial geometry of an anatomically adapted prosthesis blank, mechanical parameters such as the moments of inertia of a large number of cross-sectional profiles and the strength values of the hip joint Endoprostheses of typical material compositions are processed so that the machining of the anatomically adapted prosthesis blank 1 can be carried out. The controller 15 coordinates the three-dimensional STEPBE movements of a milling device 14 , the milling cutter 14 'is conical or wedge-shaped. As a result, multi-stage machining of the shaft 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.Thanks to the versatile design options of the Prot by means of machining the late ralen, the medial, the anterior or posterior facing side surface of the prosthetic socket is the three  dimensional distribution of elasticity along the shaft the prosthesis in an advantageous manner to the corresponding local elasticity values in the material of the wall of the Implantation of selected bone area as far as possible adaptable, which ensures that the Implan is firmly seated for many years tats in the bone because of the almost complete suppression of relative movements in the border area between Im implant and bone with normal loading of the prosthesis guaranteed.

Die Erfindung beschränkt sich in ihrer Ausführung nicht auf das vorstehend angegebene bevorzugte Ausführungsbei­ spiel. Vielmehr ist eine Anzahl von Varianten denkbar, welche von der dargestellten Lösung auch bei grundsätzlich anders gearteten Ausführungen Gebrauch macht.The invention is not restricted in its implementation to the preferred embodiment given above game. Rather, a number of variants are conceivable which of the solution shown also in principle makes use of different types.

Claims (14)

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 method for producing an insertable into a bone cavity, curved and with respect to diameter and material cross section tapering distally to the hip joint endoprosthesis from a prosthesis blank with individual adaptation to the shape of the marrow space of the bone prepared for implantation by means of metal-cutting machining, characterized is that, in addition, also in chip machining machining a profile or local recesses forming surfaces made such that the elasticity of the prosthesis shaft (2) is adapted in the inserted into the bone portion is substantially on the elasticity of the benachbar th bone (13). 2. Verfahren nach Anspruch 1, dadurch ge­ kennzeichnet, daß die Bearbeitung durch eine Vorrichtung (23) mit einem Werkzeugs (14′) erfolgt, dessen räumliche Bewegungskoordinaten mittels
  • - Computer-Tomographie
  • - Multiplex-Holographie und/oder
  • - Kernspin-Resonanz-Tomographie
2. The method according to claim 1, characterized in that the processing is carried out by a device ( 23 ) with a tool ( 14 '), the spatial movement coordinates by means
  • - Computed Tomography
  • - Multiplex holography and / or
  • - Magnetic resonance imaging
gewonnenen dreidimensionalen Elastizitäts-Verteilung im Knochen (13) im Implantationsbereich abgeleitet werden.obtained three-dimensional elasticity distribution in the bone ( 13 ) in the implantation area. 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 course of elasticity along the axis ( 4 ) of the prosthesis socket ( 2 ) by the introduction of profi lations ( 10 , 11 ) and / or recesses ( 7 , 8 ) is generated. 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 socket ( 2 ) at the proximal end ( 2.3 ) on the lateral narrow side ( 9 ) and at the distal end ( 2.1 ) on the medial narrow side ( 6 ) with a substantially V- shaped recess ( 7 or 8 ) is provided. 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 the proximally arranged recess ( 7 ) decreases distally and the depth of the distally arranged recess ( 8 ) decreases proximally. 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 ge indicates the depth of the recess essentially decreases continuously.   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. The method according to any one of claims 3 to 6, characterized in that the mechanical processing of the prosthesis blank ( 1 ) is carried out in several steps in succession. 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 socket ( 2 ) is subjected to an additional surface treatment after machining. 9. Verfahren nach Anspruch 8, dadurch ge­ kennzeichnet, daß die Schaftoberfläche madre­ poriert wird.9. The method according to claim 8, characterized ge indicates that the shaft surface madre is pored. 10. Vorrichtung zur Durchführung des Verfahrens nach ei­ nem der vorangehenden Ansprüche,
gekennzeichnet durch
  • - 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),
  • - 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,
  • - 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
  • - eine Anordnung (23) mit einem Werkzeug (14) nebst dazugehöriger Steuerung (15) zur mechanischen Bear­ beitung des Prothesenrohlings (1).
10. Device for carrying out the method according to one of the preceding claims,
marked by
  • - an electronic device ( 12 ), preferably a computer tomograph, for three-dimensionally recording the structure, density and distribution of the bone substance in an area of a bone ( 13 ) provided for the implantation of a prosthesis,
  • - A first unit ( 17 ) for processing the data determined by the device ( 12 ) and the data available from a first memory ( 19 ) about strength values of the possible bone substances for the purpose of determining the three-dimensional elasticity distribution in the bone ( 13 ) within the implantation area ,
  • - A second unit ( 16 ) for determining the control parameters for the tool ( 14 ') of a device ( 23 ) for machining an anatomically adapted prosthesis blank ( 1 ), which the amount of data determined by the first computer unit ( 17 ) and the data quantities available in a second memory ( 18 ) about the spatial geometry of the anatomically adapted prosthesis blank, mechanical parameters such as the moments of inertia of a plurality of cross-sectional profiles and the strength values of the material compositions typical for hip joint endoprostheses are processed and
  • - An arrangement ( 23 ) with a tool ( 14 ) and associated control ( 15 ) for mechanical processing of the prosthesis blank ( 1 ).
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 a CNC machine tool is provided as the machining device ( 23 ). 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 ) has a milling device ( 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 milling cutter ( 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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