DE10329241A1 - Test system for conical seat for artificial hip joint uses pressure pad with conical spring which can snap from first to second position and has conical socket fitting over foil cap on cone on shaft - Google Patents

Test system for conical seat for artificial hip joint uses pressure pad with conical spring which can snap from first to second position and has conical socket fitting over foil cap on cone on shaft Download PDF

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Publication number
DE10329241A1
DE10329241A1 DE2003129241 DE10329241A DE10329241A1 DE 10329241 A1 DE10329241 A1 DE 10329241A1 DE 2003129241 DE2003129241 DE 2003129241 DE 10329241 A DE10329241 A DE 10329241A DE 10329241 A1 DE10329241 A1 DE 10329241A1
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DE
Germany
Prior art keywords
conical
cone
test
spring
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE2003129241
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German (de)
Inventor
Emmanuel Anapliotis
Curt Kranz
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Merete Medical GmbH
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Merete Medical GmbH
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 Merete Medical GmbH filed Critical Merete Medical GmbH
Priority to DE2003129241 priority Critical patent/DE10329241A1/en
Publication of DE10329241A1 publication Critical patent/DE10329241A1/en
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/468—Testing instruments for artificial joints
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/365—Connections of heads to necks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2002/4681—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor by applying mechanical shocks, e.g. by hammering
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys

Abstract

The foil cap (4) is made of a material which changes color when subjected to pressure. It may be printed with a raster grid for ease in determining position of color-changed pressure points. To perform the test, the cap is placed on the conical end (5) of the shaft of the prosthesis. The conical socket in the center of the spring is placed over the cap. A broad button on the opposite side to the spring is pushed down and the spring snaps from its first to its second position at a given loading.

Description

Die Erfindung betrifft ein Prüfinstrument zur Beurteilung des Konussitzes von Hüftendoprothesen.The The invention relates to a test instrument for assessing the conical seat of hip endoprostheses.

Die Notwendigkeit zu einer Prüfung des Konussitzes ergibt sich aus der Erkenntnis, dass bei einer Revisionsoperation, die mindestens nach einem Defekt des Keramiksteckkopfes der Hüftendoprothese durchzuführen ist, vom Operateur die Entscheidung getroffen werden muss, ob die Oberflächenbeschaffenheit des Metallkonus einen Zustand aufweist, der eine spätere Lockerung oder Instabilität der Konusverbindung ausschließt. Diese Bewertung ist für den Patienten von besonderer Bedeutung, da vom Zustand des Konussitzes die Eignung des implantierten Prothesenschaftes für eine weitere Fixierung eines Kugelgelenkes abhängig ist. Aus Gründen der Sicherheit wird in der chirurgischen Praxis im Zweifelsfalle ohne nähere Prüfung auch bei leichten defekten des Konussitzes der Prothesenschaft gewechselt. Dieser Wechsel des Prothesenschaftes stellt für den Patienten jedoch eine erhebliche Mehrbelastung dar, die auch den Erfolg der Revisionsoperation entscheidend beeinträchtigen kann.The Need for an exam of the cone seat results from the realization that during a revision operation, at least after a defect of the ceramic plug head of the hip endoprosthesis perform is, the surgeon must decide whether the surface finish the metal cone has a state of later relaxation or instability of Excludes cone connection. This review is for the patient of particular importance because of the state of the conical seat the suitability of the implanted prosthesis stem for another Fixation of a ball joint is dependent. Because of Safety is in the surgical practice in case of doubt without details exam even with slight defects of the conical seat of the prosthesis stem changed. However, this change of the prosthesis stem provides for the patient considerable additional burden, which is also the success of the revision surgery decisively impair can.

Technische Möglichkeiten zur Prüfung und Beurteilung von metallischen Oberflächen sind zwar allgemein bekannt, jedoch in der chirurgischen Praxis nicht praktikabel, da beispielsweise mikroskopische Betrachtungen zur Oberflächenbeschaffenheit zeitaufwändig sind und darüber hinaus lediglich partielle Bewertungen ermöglichen, nicht aber die gesamte Oberfläche der Konuspassung in eine Prüfung einbeziehen. Geringfügige Defekte, die ohne wesentlichen Einfluss auf die Stabilität der Konusverbindung bleiben, können mit den herkömmlichen Oberflächenprüfmethoden nicht schnell und zuverlässig abgegrenzt werden. Somit entstehen für den betroffenen Patienten körperliche Mehrbelastungen und für den klinischen Betrieb ein höherer Aufwand.Technical options for testing and judgment of metallic surfaces are well known, However, not practical in surgical practice, for example microscopic considerations of surface finish are time consuming and above In addition, only partial assessments allow, but not the entire surface Include the Konuspassung in an exam. slight Defects that do not significantly affect the stability of the cone joint can with the conventional ones surface testing methods not fast and reliable be demarcated. Thus arise for the affected patient physical Additional burdens and for the clinical operation a higher Effort.

Aufgabe der Erfindung ist es, ein Prüfinstrument zur Beurteilung des Konussitzes zu schaffen, mit dem in einfacher Weise eine optische Darstellung und Bewertung des Umfanges des Verschleißes der tragenden Flächen als Sicherheitskriterium erfolgen kann.task The invention is a test instrument to create an assessment of the conical seat, with which in simple Way a visual representation and assessment of the extent of wear of the bearing surfaces as a safety criterion.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass zwischen die zu prüfenden Oberfläche, beispielsweise dem Metallkonus des Prothesenschaftes und der Konusaufnahme eines Prüfinstruments eine Prüffolie eingesetzt wird, die sich unter Druckeinwirkung verfärbt. Das Prüfinstrument besteht aus einem Durchschlag-Federelement und einer, dem Metallkonus des Prothesenschaftes entsprechenden konusförmigen Aufnahme für die Prüffolie. Die druckempfindliche Prüffolie ist graphisch aufgeteilt, Vorteilhafterweise mit einem Millimeterraster. Nach der Druckausübung auf die Druckfläche des Prüfinstruments kommt es zum Durchschlag des Federelements und damit zur Einwirkung einer definierten Kraft auf Konus und Folie, Dabei verfärbt sich die Folie an den tragenden Flächen. Nach Trennung der Verbindung Prüfinstrument-Folie-Metallkonus kann visuell die Größe der noch tragenden Kontaktfläche des Konus anhand der Verfärbung der Prüffolie vom Operateur bewertet werden.According to the invention this Task solved by that between the ones to be tested Surface, for example, the metal cone of the prosthesis stem and the cone holder a test instrument a test film is used, which discolors under pressure. The test instrument consists of a punch-spring element and one corresponding to the metal cone of the prosthetic socket conical Recording for the test film. The pressure-sensitive test film is divided graphically, advantageously with a millimeter grid. After the exercise of pressure on the printing surface of the test instrument it comes to the breakdown of the spring element and thus to the action a defined force on cone and foil, it discolors the foil on the supporting surfaces. After separation of the compound test instrument foil metal cone can visually the size of it yet bearing contact surface of the Cone based on the discoloration the test film be evaluated by the surgeon.

Im Folgenden wird eine mögliche Ausführungsform der Erfindung anhand der Zeichnungen näher erläutert.in the Following is a possible embodiment the invention explained in more detail with reference to the drawings.

Es zeigen:It demonstrate:

1 einen Schnitt durch eine Ausführungsform des Prüfinstruments in Ausgangsposition. 1 a section through an embodiment of the test instrument in the starting position.

2 einen Schnitt durch das Prüfinstrument nach erfolgtem Durchschlag mit Darstellung der hülsenförmigen Prüffolie und Metallkonus des Prothesenschaftes 2 a section through the test instrument after successful breakdown showing the sleeve-shaped test film and metal cone of the prosthesis stem

Das Prüfinstrument (1) ist in der Darstellung oben mit einer Druckfläche (6) ausgestattet auf die eine ausreichende Kraft, die zum Durchschlagen des Federelements (2) führt, ausgeübt wird. Die konusförmige Aufnahme (3) des Prüfinstrumentes nimmt die hülsenförmige Prüffolie (4) und den Metallkonus(5) des Prothesenschaftes auf.The test instrument ( 1 ) is in the representation above with a printing surface ( 6 ) equipped to the sufficient force, which serves for the penetration of the spring element ( 2 ) is exercised. The cone-shaped receptacle ( 3 ) of the test instrument takes the sleeve-shaped test film ( 4 ) and the metal cone ( 5 ) of the prosthesis socket.

Claims (5)

Prüfinstrument zur Beurteilung des Konussitzes von Hüftendoprothesen dadurch gekennzeichnet, dass es aus Durchschlagfederelement, Prüffolie und einer konusförmige Aufnahme für die Prüffolie und den zu prüfenden Metallkonus bestehtTest instrument for assessing the conical seat of hip endoprostheses, characterized in that it consists of a spring element, test sheet and a cone-shaped receptacle for the test film and the metal cone to be tested Prüfinstrument nach Anspruch 1 dadurch gekennzeichnet, das gegenüber der konusförmigen Aufnahme eine Druckfläche angeordnet ist, über die der zur Prüfung notwendige Kraftimpuls ausgeübt wird.test instrument according to claim 1, characterized in that against the cone-shaped recording a printing surface is arranged over the one to the test necessary force impulse is exercised. Prüfinstrument nach Anspruch 1 dadurch gekennzeichnet, dass die Prüffolie graphisch aufgeteilt ist.test instrument according to claim 1, characterized in that the test film graphically is divided. Prüfinstrument nach Anspruch 1 und 3 dadurch gekennzeichnet, dass die graphische Aufteilung vorzugsweise ein Millimeterraster ist.test instrument according to claim 1 and 3, characterized in that the graphic Division is preferably a millimeter grid. Prüfinstrument nach Anspruch 1 und 3 dadurch gekennzeichnet, dass die Prüffolie hülsenförmig ausgebildet ist.test instrument according to claim 1 and 3, characterized in that the test film is sleeve-shaped is.
DE2003129241 2003-06-24 2003-06-24 Test system for conical seat for artificial hip joint uses pressure pad with conical spring which can snap from first to second position and has conical socket fitting over foil cap on cone on shaft Withdrawn DE10329241A1 (en)

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DE2003129241 DE10329241A1 (en) 2003-06-24 2003-06-24 Test system for conical seat for artificial hip joint uses pressure pad with conical spring which can snap from first to second position and has conical socket fitting over foil cap on cone on shaft

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009118196A1 (en) * 2008-03-27 2009-10-01 Mathys Ag Bettlach Test device for testing geometric properties of a prosthesis part
WO2010069292A2 (en) 2008-12-18 2010-06-24 Merete Medical Gmbh Method and device for determining the compatibility between an adapter and an outer cone of a prosthesis shaft of a modular joint prosthesis
DE102008062730A1 (en) * 2008-12-18 2010-06-24 Merete Medical Gmbh Method for determining adaptability between adapter in joint ball and external cone of prosthesis shaft of modular joint prosthesis during revision operation of patient, involves determining whether adapter fits to cone of prosthesis
US9375317B2 (en) 2008-09-02 2016-06-28 Merete Medical Gmbh Knee arthrodesis implant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69206417T2 (en) * 1991-07-04 1996-04-18 Marposs Spa DEVICE FOR TESTING THE SURFACE PROPERTIES OF CONICAL OBJECTS.
WO1998001090A1 (en) * 1996-07-06 1998-01-15 Cerasiv Gmbh Innovatives Keramik-Engineering Method of testing ceramic cotyloid cavities for hip joint endoprostheses
DE29911169U1 (en) * 1999-06-26 1999-10-28 Friedrich Markus Long-term test equipment for simulating the stress on cemented and cementless femoral hip prostheses using a servopneumatic pulse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69206417T2 (en) * 1991-07-04 1996-04-18 Marposs Spa DEVICE FOR TESTING THE SURFACE PROPERTIES OF CONICAL OBJECTS.
WO1998001090A1 (en) * 1996-07-06 1998-01-15 Cerasiv Gmbh Innovatives Keramik-Engineering Method of testing ceramic cotyloid cavities for hip joint endoprostheses
DE29911169U1 (en) * 1999-06-26 1999-10-28 Friedrich Markus Long-term test equipment for simulating the stress on cemented and cementless femoral hip prostheses using a servopneumatic pulse

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009118196A1 (en) * 2008-03-27 2009-10-01 Mathys Ag Bettlach Test device for testing geometric properties of a prosthesis part
DE102008015994B4 (en) 2008-03-27 2021-12-23 Mathys Ag Bettlach Testing device for testing the geometric properties of a prosthesis part
US9375317B2 (en) 2008-09-02 2016-06-28 Merete Medical Gmbh Knee arthrodesis implant
WO2010069292A2 (en) 2008-12-18 2010-06-24 Merete Medical Gmbh Method and device for determining the compatibility between an adapter and an outer cone of a prosthesis shaft of a modular joint prosthesis
DE102008062730A1 (en) * 2008-12-18 2010-06-24 Merete Medical Gmbh Method for determining adaptability between adapter in joint ball and external cone of prosthesis shaft of modular joint prosthesis during revision operation of patient, involves determining whether adapter fits to cone of prosthesis
DE102009057117A1 (en) 2008-12-18 2010-08-12 Merete Medical Gmbh Method and device for determining the fit between an adapter and an outer cone of a prosthetic socket of a modular joint prosthesis
US8533968B2 (en) 2008-12-18 2013-09-17 Merete Medical Gmbh Method and device for determining the compatibility between an adapter and an outer cone of a prosthesis shaft of a modular joint prosthesis

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Effective date: 20120104