DE202009004348U1 - Device for measuring the anchoring strength of endoprostheses in situ - Google Patents

Device for measuring the anchoring strength of endoprostheses in situ Download PDF

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DE202009004348U1
DE202009004348U1 DE200920004348 DE202009004348U DE202009004348U1 DE 202009004348 U1 DE202009004348 U1 DE 202009004348U1 DE 200920004348 DE200920004348 DE 200920004348 DE 202009004348 U DE202009004348 U DE 202009004348U DE 202009004348 U1 DE202009004348 U1 DE 202009004348U1
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loosening
endoprosthesis
membrane
situ
mass oscillator
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Bader Rainer Pd Drmed Dipl-Ing
Kluess Daniel Dr-Ing
Mittelmeier Wolfram Prof Drmed
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Bader Rainer Pd Drmed Dipl-Ing
Kluess Daniel Dr-Ing
Mittelmeier Wolfram Prof Drmed
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Publication of DE202009004348U1 publication Critical patent/DE202009004348U1/en
Priority to DE102010003279A priority patent/DE102010003279A1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/07—Endoradiosondes
    • A61B5/076—Permanent implantations
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
    • A61B5/4504—Bones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
    • 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
    • A61F2/4657—Measuring instruments used for implanting 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • 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
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006—Properties of materials and coating materials
    • A61F2002/30087—Properties of materials and coating materials piezoelectric
    • 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
    • A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
    • A61F2002/30668—Means for transferring electromagnetic energy to implants
    • A61F2002/3067—Means for transferring electromagnetic energy to implants for data transfer
    • 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
    • A61F2002/4631—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
    • 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
    • A61F2/4657—Measuring instruments used for implanting artificial joints
    • A61F2002/4671—Measuring instruments used for implanting artificial joints for measuring resonant frequency
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0001—Means for transferring electromagnetic energy to implants
    • A61F2250/0002—Means for transferring electromagnetic energy to implants for data transfer

Abstract

Lockerungssensor, platziert innerhalb einer Endoprothese, bestehend aus einer Feder und einem ferromagnetischen Massenschwinger, mit der Möglichkeit, dass der Massenschwinger eine anliegende Membran zum Schwingen anregen kann.Loosening sensor placed inside an endoprosthesis consisting of a spring and a ferromagnetic mass oscillator, with the possibility that the mass oscillator can excite an adjacent membrane to vibrate.

Figure 00000001
Figure 00000001

Description

Der Hauptgrund für einen Hüftendoprothesenwechsel ist mit einer Häufigkeit von ca. 75 die aseptische Lockerung. Die aseptische Lockerung von Hüftendoprothesen wird überwiegend anhand klinischer Symptomatik und Röntgenaufnahmen diagnostiziert, jedoch sind die Sensitivitäten und Spezifitäten suboptimal. Eine neue Form der Lockerungsdiagnostik ist von hoher klinischer Relevanz, um einerseits unnötige Operationen zu vermeiden und andererseits der Entstehung großer Knochendefekte bei verspäteter Revision vorzubeugen.Of the Main reason for a hip replacement is with a frequency of about 75 the aseptic loosening. The aseptic loosening of Hip prostheses becomes prevalent diagnosed on the basis of clinical symptoms and X-rays, however, the sensitivities are and specificities suboptimal. A new form of loosening diagnostics is high Clinical relevance, on the one hand to avoid unnecessary operations and on the other hand, the emergence of large bone defects in late revision submissions.

Ziel der Erfindung ist es, den Zustand der Verankerung von Endoprothesen mit Hilfe von Sensoren, welche innerhalb der Endoprothese angebracht sind, zu erfassen und die Information ex-vivo zu übertragen. Die Erfindung basiert auf zwei verschiedenen Sensortypen, die im Folgenden beschrieben werden.aim The invention is the state of anchoring of endoprostheses with the help of sensors, which are mounted inside the endoprosthesis are to capture and transmit the information ex-vivo. The invention is based on two different sensor types, which in the Described below.

Der akusto-mechanisch orientierte Ansatz zur In-situ-Lockerungsdiagnostik basiert auf Massenschwingern, welche innerhalb der Endoprothese angebracht sind. Bei den Massenschwingern handelt es sich um magnetische Ferritkörper, welche an einem Federstahl aufgehängt sind. Die magnetische Nord-Süd-Polung der Ferritkörper erlaubt eine Schwingungserregung mittels äußerem Wechselfeldimpuls sowie ein Auslesen der Schwingung mit Hilfe einer extrakorporalen Spule. Dabei wird der Vorteil genutzt, dass die gängigsten Implantatwerkstoffe in der Endoprothetik, Titan- und Kobalt-Chrom-Legierungen, keine ferromagnetischen Materialien sind.Of the acousto-mechanically oriented approach to in-situ loosening diagnostics based on mass oscillators, which are within the endoprosthesis are attached. The mass swingers are magnetic ferrite, which are hung on a spring steel. The magnetic north-south polarity the ferrite body allows vibration excitation by means of external alternating field pulse as well a reading of the oscillation with the help of an extracorporeal coil. The advantage is taken advantage of that the most common implant materials in endoprosthetics, titanium and cobalt-chromium alloys, none ferromagnetic materials are.

Angrenzend an den ferromagnetischen Massenschwinger soll eine Membran die Schwingungen auf den benachbarten Knochen übertragen. Bei der Messung der Verankerungsfestigkeit wird zunächst mittels einer extrakorporalen Spule ein Wechselfeldimpuls aufgebracht, welcher den Massenschwinger in Schwingungen versetzt und auf die Membran treffen lässt. Je nach Verankerungszustand der Membran im Knochen wird dabei die Schwingung mehr oder weniger gedämpft. Diese Dämpfung kann ebenfalls mit der extrakorporalen Spule anhand der resultierenden Bewegung des ferromagnetischen Massenschwingers registriert werden. Um eine ungewollte Schwingung der Ferritkörper außerhalb der Messungen zu verhindern, soll mit dem Federstahl eine gewisse mechanische Vorspannung aufgebracht werden, wodurch die Ferritkörper an die Membran gedrückt werden.Adjacent At the ferromagnetic mass oscillator a membrane is supposed to absorb the vibrations transmitted to the neighboring bone. When measuring the anchoring strength is first using an extracorporeal coil applied an alternating field pulse, which the mass oscillator vibrated and on the membrane to meet. Depending on the anchoring state of the membrane in the bone is doing the Vibration more or less muted. This damping can also work with the extracorporeal coil based on the resulting Movement of the ferromagnetic mass oscillator are registered. In order to prevent an unwanted oscillation of the ferrite bodies outside the measurements, should be applied with the spring steel a certain mechanical bias, whereby the ferrite bodies pressed against the membrane become.

Der piezo-akustisch basierte Ansatz zur In-situ-Lockerungsdiagnostik beruht auf Piezoelementen, welche an einer dünnwandigen Membran an der Implantatoberfläche lokalisiert sind. Die Piezoelemente sind mit einer Spule und einer Kapazität in Reihe geschaltet. Mittels einer externen Spule wird eine Spannung im Implantat induziert und das Piezoelement zum Schwingen angeregt. Anschließend wird die gleiche Schaltung als Sender verwendet. Die durch das Ausschwingen des Piezoelements erzeugten Spannungen werden von der internen Spule in ein elektromagnetisches Feld umgewandelt, welches von extern registriert wird.Of the Piezo-acoustic based approach to in-situ loosening diagnostics Based on piezoelectric elements, which locates on a thin-walled membrane on the implant surface are. The piezo elements are in series with a coil and a capacitor connected. An external coil causes a voltage in the implant induced and excited the piezoelectric element to vibrate. Subsequently, will the same circuit used as a transmitter. The by the swinging voltages generated by the piezo element are from the internal coil converted into an electromagnetic field, which is externally is registered.

Die Grundlage beider Verfahren ist der Impedanzunterschied zwischen den periprothetisch angelagerten biologischen Materialien: Befindet sich an der Außenseite der Membran weiches Gewebe oder Flüssigkeit, ergibt sich ein großer Unterschied in der mechanischen Impedanz. Folglich werden die Schwingungen des jeweiligen Sensors größtenteils reflektiert und nicht weitergeleitet, wodurch eine geringe Dämpfung eintritt. Ist die Membran hingegen mit festem Knochengewebe verbunden, ergibt dieses einen geringen Unterschied in der mechanischen Impedanz. Die Schwingungen werden größtenteils weitergeleitet und klingen schnell ab. Eine starke Dämpfung signalisiert folglich festen Knochenkontakt. Dieser Effekt wird verstärkt, wenn der erregte Schwinger und die anliegende Membran gleiche Eigenfrequenzen aufweisen. Die gemessene Dämpfung der Schwingung des Sensors ist folglich der Indikator für die Verankerungsfestigkeit der Endoprothese.The Basis of both methods is the impedance difference between the periprosthetic deposited biological materials: Located on the outside the membrane soft tissue or fluid, there is a big difference in the mechanical impedance. Consequently, the vibrations of the largely reflected by the respective sensor and not forwarded, whereby a low attenuation occurs. Is the membrane however, connected with solid bone tissue, this gives one slight difference in mechanical impedance. The vibrations are mostly forwarded and sound quickly. A strong damping signals hence solid bone contact. This effect is amplified when the excited oscillator and the adjacent membrane same natural frequencies exhibit. The measured attenuation The vibration of the sensor is therefore the indicator of the anchoring strength the endoprosthesis.

Durch Anbringen mehrerer Sensoren innerhalb der Endoprothese sollen zuverlässige Informationen über die Verankerungsfestigkeit gewonnen werden. Die Sensoren lassen sich dabei einzeln steuern sofern deren Eigenfrequenz in ausreichendem Maße voneinander abweicht.By Attaching several sensors within the endoprosthesis are supposed to provide reliable information about the Anchoring strength can be recovered. The sensors can be individually controlling if their natural frequency is sufficient Dimensions of each other differs.

1: Übersicht einer Endoprothese (I) im Knochenlager (II). In der teilweisen Schnittdarstellung ist der Lockerungssensor (III) nach Anspruch 1 im Inneren des Endoprothesenstiels abgebildet 1 : Overview of an endoprosthesis ( I ) in the bone store ( II ). In the partial sectional view is the loosening sensor ( III ) according to claim 1 imaged inside the Endoprothesenstiels

2: Schnittdarstellung einer Endoprothese (I) im umgebenden Knochenlager (II) mit Implantat-Knochen-Grenzschicht (III). Lockerungssensor nach Anspruch 1, bestehend aus Feder (IV) und ferromagnetischem Massenschwinger (V), angrenzend an eine Membran (VI) 2 : Sectional view of an endoprosthesis ( I ) in the surrounding bone stock ( II ) with implant-bone boundary layer ( III ). Loosening sensor according to claim 1, consisting of spring ( IV ) and ferromagnetic mass oscillator ( V ), adjacent to a membrane ( VI )

3: Schnittdarstellung einer Endoprothese (I) im umgebenden Knochenlager (II) mit Implantat-Knochen-Grenzschicht (III). Lockerungssensor nach Anspruch 2, bestehend aus Piezoelement (IV), in Reihe geschaltet mit einer Induktivität (C1) und einer Spule (L1), angrenzend an eine Membran (V) 3 : Sectional view of an endoprosthesis ( I ) in the surrounding bone stock ( II ) with implant-bone boundary layer ( III ). Loosening sensor according to claim 2, consisting of piezo element ( IV ) connected in series with an inductance (C 1 ) and a coil (L 1 ), adjacent to a membrane ( V )

Claims (4)

Lockerungssensor, platziert innerhalb einer Endoprothese, bestehend aus einer Feder und einem ferromagnetischen Massenschwinger, mit der Möglichkeit, dass der Massenschwinger eine anliegende Membran zum Schwingen anregen kann.Loosening sensor placed inside an endoprosthesis consisting of a spring and egg A ferromagnetic mass oscillator, with the possibility that the mass oscillator can excite an adjacent membrane to vibrate. Piezoelement als Lockerungssensor, platziert innerhalb einer Endoprothese, welches eine anliegende Membran zum Schwingen anregen kann und mit einer Spule und einer Kapazität in Reihe geschaltet ist.Piezo element as a relaxation sensor, placed inside an endoprosthesis, which an adjacent membrane to swing can stimulate and in series with a coil and a capacity is switched. Mehrere Lockerungssensoren nach Anspruch 1 und Anspruch 2, platziert an verschiedenen Stellen innerhalb der Endoprothese. Die verschiedenen Stellen entsprechen dabei den charakteristischen Orten, an welchen der jeweilige Endoprothesen-Typ die ersten auf klinischen Erfahrungen basierenden Lockerungserscheinungen zeigt.Several loosening sensors according to claim 1 and claim 2, placed at various locations within the endoprosthesis. The different places correspond to the characteristic Locations on which the respective endoprosthesis type on the first clinical experience based loosening phenomena. Platzierung mehrerer Lockerungssensoren nach Anspruch 1 und Anspruch 2 in Form von Anspruch 3, wobei die Lockerungssensoren über verschiedene Eigenfrequenzen verfügen und somit einzeln angesteuert werden können.Placement of several loosening sensors according to claim 1 and claim 2 in the form of claim 3, wherein the loosening sensors have different Own frequencies and thus can be controlled individually.
DE200920004348 2009-03-27 2009-03-27 Device for measuring the anchoring strength of endoprostheses in situ Expired - Lifetime DE202009004348U1 (en)

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DE102010003279A DE102010003279A1 (en) 2009-03-27 2010-03-25 Device and method for the in situ measurement of the anchoring strength of endoprostheses

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018106945B3 (en) 2018-03-23 2019-03-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. endoprosthesis

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012218673A1 (en) 2012-10-12 2014-04-17 Universität Rostock Device and method for measuring the anchoring state of implants
DE102012218671A1 (en) 2012-10-12 2014-04-17 Universität Rostock Device for sensor integration for endoprostheses
DE102014109683B4 (en) 2014-07-10 2016-09-15 Universität Rostock Device for detecting a relaxation and / or wear of an endoprosthesis
DE102015120516A1 (en) * 2015-11-26 2017-06-01 Universität Rostock Device for stimulating a vibration for bones
DE102021127698A1 (en) 2021-10-25 2023-04-27 Universität Rostock, Körperschaft des öffentlichen Rechts Insertion device for joining and implanting prosthetic implants
DE102021127697A1 (en) 2021-10-25 2023-04-27 Universität Rostock, Körperschaft des öffentlichen Rechts Interchangeable adapter for coupling to an insertion device for joining and implanting prosthetic implants

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Publication number Priority date Publication date Assignee Title
JPH02246923A (en) 1988-12-21 1990-10-02 Alexander D Rosenstein Hip joint transplantation diagnosis
GB9107700D0 (en) 1991-04-11 1991-05-29 Imperial College Testing implants

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018106945B3 (en) 2018-03-23 2019-03-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. endoprosthesis
WO2019179578A1 (en) 2018-03-23 2019-09-26 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. Prosthesis system

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