DE19807603A1 - Inlet for knee joint endoprosthesis adjusts flexible to radius of femur - Google Patents

Inlet for knee joint endoprosthesis adjusts flexible to radius of femur

Info

Publication number
DE19807603A1
DE19807603A1 DE1998107603 DE19807603A DE19807603A1 DE 19807603 A1 DE19807603 A1 DE 19807603A1 DE 1998107603 DE1998107603 DE 1998107603 DE 19807603 A DE19807603 A DE 19807603A DE 19807603 A1 DE19807603 A1 DE 19807603A1
Authority
DE
Germany
Prior art keywords
radius
inlay
characterized
knee joint
femur
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Withdrawn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
DE1998107603
Other languages
German (de)
Inventor
Krehl
Original Assignee
Krehl
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 Krehl filed Critical Krehl
Priority to DE1998107603 priority Critical patent/DE19807603A1/en
Publication of DE19807603A1 publication Critical patent/DE19807603A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/38Joints for elbows or knees
    • A61F2/389Tibial components
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The 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
    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30581Special structural features of bone or joint prostheses not otherwise provided for having a pocket filled with fluid, e.g. liquid

Abstract

The inlay consists of a plane outer frame (1), which divides the device into two halves, and flexible concave inner support areas. The support areas are covered with a nap pattern (2) fixed to a flexible titanium netting. A layer (3), filled with a gel or a similar fluid (4) is positioned between the plane base (1) and the napped surface (2).

Description

Die Erfindung betrifft eine Vorrichtung entsprechend dem Oberbegriff des Anspruchs 1. The invention relates to a device according to the preamble of claim 1.

Der Bewegungsablauf eines natürlichen Kniegelenkes setzt sich aus Gleit- und Abrollbewegungen zusammen. The motion of a natural knee joint is made up of sliding and rolling movements. Ermöglicht wird dies unter anderem durch die spezielle Anatomie des unteren Endes des Oberschenkelknochens. This is made possible with the specific anatomy of the lower end of the femur. Hier nimmt der Radius von vorn nach hinten ab; Here, the radius of the front decreases to the rear; die Krümmungsmittelpunkte liegen auf einer Spirallinie. the centers of curvature lie on a spiral line.

Kniegelenksendoprothesen imitieren den natürlichen Bewegungsablauf. Knee joint replacements mimic the natural motion. Die Auflagefläche des Unterschenkelteils besteht meist aus einem leicht konkav geformten starren Polyäthylen-Inlay. The bearing surface of the lower leg part usually consists of a slightly concave-shaped rigid polyethylene inlay. Die Radius der Konkavität ist größer als die je nach Beugestellung variable Konvexität des Oberschenkelteils, um ein Abrollen zu erreichen. The radius of the concavity is greater than the variable depending on the flexion convexity of the femoral component in order to achieve a rolling.

Dadurch ergibt sich zwangsläufig eine nur kleine, punkt- bis linienförmige Auflagefläche. This necessarily only a small, point-to linear bearing surface. Es resultiert Abrieb und Kaltfluß des Polyäthylens. This results in wear and cold flow of the polyethylene. Einerseits stellen die Abriebprodukte einen permanenten Entzündungsherd im Kniegelenk dar. Andrerseits wird die Prothese dem Anspruch nach reibungsarmem Lauf nicht mehr gerecht. On one hand, the wear products represent a permanent inflammation in the knee joint. On the other hand, the prosthesis is the claim no longer meets friction running. Es wirken verstärkt Kräfte auf die Prothesen-Knochengrenze, die eine Lockerung begünstigen. There seem increasingly forces on the prosthesis-bone boundary that favor an easing.

Aufgabe der Erfindung ist es, die Auflagefläche des Oberschenkelteils auf dem Inlay zu vergrößern und die genannten Probleme zu minimieren. The object of the invention is to increase the bearing surface of the femoral part on the inlay and to minimize the above problems.

Diese Aufgabe wird durch ein Inlay mit den Merkmalen nach den Ansprüchen 1 bis 6 gelöst. This object is achieved by an inlay with the features according to claims 1 to. 6

Dabei ist das Inlay keine starre Fläche, sondern besteht beispielsweise aus einzelnen, noppenartig aufgeteilten Flächen, die auf einem flexiblen Träger fixiert sind. In this case, the inlay is not a rigid surface but consisting for example of individual knob-like split surfaces which are fixed on a flexible support. Diese Konstruktion ruht auf einem niedrigen, mit Fluid, z. This structure rests on a low, with fluid, z. B. Gel gefüllten Kissen, jeweils getrennt für Innen- und Außenseite. B. gel-filled cushion, in each case separately for the inside and outside. Dieses Fluid verteilt die einwirkenden Kräfte gleichmäßig auf die Auflagefläche. This fluid distributes the forces evenly on the supporting surface.

Die flexible Auflage dieses Inlays paßt sich je nach Gelenkstellung dem veränderten Radius an. The flexible support of this inlay conforms to the changed radius depending on the joint position. Die Auflagefläche wird vergrößert. The contact surface is enlarged. Durch die gleichmäßige Verteilung werden punktförmige Spitzenkräfte vermieden. The uniform distribution pointed tip forces are avoided. Abrieb und Kaltfluß werden deutlich verringert. Wear and cold flow are significantly reduced. Dadurch, daß das Volumen des Fluids sich nicht ändert, wird kein elastischer Puffer erzeugt, der eine Instabilität fördern könnte. Characterized in that the volume of fluid does not change, no elastic buffer is created which may promote instability.

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher beschrieben. Embodiments of the invention are illustrated in the drawings and will be described in more detail below. Es zeigen Show it

Fig. 1 die Draufsicht auf das Inlay und Fig. 1 is a plan view of the inlay and

Fig. 2 einen senkrechten Schnitt durch das Inlay. Fig. 2 is a vertical section through the inlay.

Das Inlay besteht aus einer Umfassung ( 1 ) der üblichen Form. The inlay consists of an enclosure (1) of the conventional form. Die für Innen- und Außenseite getrennten Auflageflächen sind flexibel. The separate interior and exterior bearing surfaces are flexible. Sie bestehen z. They are made for. B. aus Noppen 2 , die auf einem beweglichen Träger 3 , z. B. from studs 2, which on a movable support 3, z. B. einem Titannetz fixiert sind. B. fixed a titanium mesh. Gestützt wird die Auflagefläche jeweils durch ein Kissen, bestehend aus Fluid 4 , z. The support surface is supported in each case by a pillow consisting of fluid 4, z. B. Gel, und einer Ummantelung 5 . B. Gel, and a jacket. 5

In einer nicht dargestellten Ausführung ist die Auflagefläche jeweils als geschlossene, flexible Fläche ausgebildet. In a not illustrated embodiment, the bearing surface is formed in each case as a closed, flexible sheet. In einer ebenfalls nicht dargestellten Ausführung wird die Auflagefläche durch Querrippen gebildet. In a likewise not illustrated embodiment the support surface is formed by transverse ribs. In einer ebenfalls nicht dargestellten Ausführung sind Noppen bzw. Rippen und Träger einteilig, z. In a likewise not illustrated exemplary knobs or ribs and supports are in one piece, for example. B. aus Polyäthylen geformt. B. molded from polyethylene.

Bezugszeichenliste LIST OF REFERENCE NUMBERS

1 1

Umfassung encirclement

2 2

Noppen burl

3 3

beweglicher Träger Portable Vehicle

4 4

Fluid fluid

5 5

Ummantelung jacket

Claims (6)

1. Inlay für Kniegelenksendoprothesen, dadurch gekennzeichnet , daß die Auflageflächen sich jeweils flexibel dem Radius des Oberschenkelteils anpassen. 1. inlay for knee endoprostheses, characterized in that the bearing surfaces in each case flexibly adapted to the radius of the femoral part.
2. Inlay nach Anspruch 1, dadurch gekennzeichnet, daß die einwirkenden Kräfte durch ein Fluid gleichmäßig auf die Oberfläche verteilt werden. 2. Inlay according to claim 1, characterized in that the forces are distributed through a fluid evenly over the surface.
3. Inlay nach Anspruch 1 und 2, dadurch gekennzeichnet, daß separate Fluid gefüllte Kissen ( 4 ) die flexiblen Oberflächen für Innen- und Außenseite tragen. 3. Inlay according to claim 1 and 2, characterized in that separate fluid-filled pads (4) carrying the flexible surfaces for indoor and outdoor side.
4. Inlay nach Anspruch 1-3, dadurch gekennzeichnet, daß die Auflagefläche aus Noppen ( 2 ) besteht, die auf einem beweglichen Träger ( 3 ) fixiert sind. 4. Inlay according to claims 1-3, characterized in that the bearing surface of knobs (2), which are fixed on a mobile support (3).
5. Inlay nach Anspruch 1-3, dadurch gekennzeichnet, daß die Auflagefläche durch Rippen gebildet werden, die auf einem beweglichen Träger ( 3 ) fixiert sind. 5. Inlay according to claims 1-3, characterized in that the bearing surface are formed by ribs on a mobile support (3) are fixed.
6. Inlay nach Anspruch 1-3, dadurch gekennzeichnet, daß die Auflagefläche als geschlossene, aber sich flexibel dem Radius des Oberschenkelteils anpassende Fläche ausgebildet ist. 6. Inlay according to claims 1-3, characterized in that the supporting surface is designed as a closed, but flexibly adjusting the radius of the femoral component surface.
DE1998107603 1998-02-17 1998-02-17 Inlet for knee joint endoprosthesis adjusts flexible to radius of femur Withdrawn DE19807603A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1998107603 DE19807603A1 (en) 1998-02-17 1998-02-17 Inlet for knee joint endoprosthesis adjusts flexible to radius of femur

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1998107603 DE19807603A1 (en) 1998-02-17 1998-02-17 Inlet for knee joint endoprosthesis adjusts flexible to radius of femur
PCT/EP1999/000947 WO1999042061A1 (en) 1998-02-17 1999-02-12 Method for guiding external air from the outside through a window in a forced ventilated space and window for the same
DE29916589U DE29916589U1 (en) 1998-02-17 1999-02-12 joint prosthesis

Publications (1)

Publication Number Publication Date
DE19807603A1 true DE19807603A1 (en) 1999-08-19

Family

ID=7858671

Family Applications (2)

Application Number Title Priority Date Filing Date
DE1998107603 Withdrawn DE19807603A1 (en) 1998-02-17 1998-02-17 Inlet for knee joint endoprosthesis adjusts flexible to radius of femur
DE29916589U Expired - Lifetime DE29916589U1 (en) 1998-02-17 1999-02-12 joint prosthesis

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE29916589U Expired - Lifetime DE29916589U1 (en) 1998-02-17 1999-02-12 joint prosthesis

Country Status (2)

Country Link
DE (2) DE19807603A1 (en)
WO (1) WO1999042061A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2803191A1 (en) * 2000-01-04 2001-07-06 Bernard Wirth Intra-articulatary surgical prosthesis has plastics cup screwed into place and formed of casing separated from multiple layer lining by fluid gap
FR2803190A1 (en) * 2000-01-04 2001-07-06 Bernard Wirth Prosthesis for joints comprises a deformable pocket divided in compartments with doubler and filled with a material

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WO2000035346A2 (en) 1998-09-14 2000-06-22 Stanford University Assessing the condition of a joint and preventing damage
WO2002022013A1 (en) 2000-09-14 2002-03-21 The Board Of Trustees Of The Leland Stanford Junior University Assessing condition of a joint and cartilage loss
US8439926B2 (en) 2001-05-25 2013-05-14 Conformis, Inc. Patient selectable joint arthroplasty devices and surgical tools
US7534263B2 (en) 2001-05-25 2009-05-19 Conformis, Inc. Surgical tools facilitating increased accuracy, speed and simplicity in performing joint arthroplasty
US8556983B2 (en) 2001-05-25 2013-10-15 Conformis, Inc. Patient-adapted and improved orthopedic implants, designs and related tools
US7468075B2 (en) 2001-05-25 2008-12-23 Conformis, Inc. Methods and compositions for articular repair
US8623026B2 (en) 2006-02-06 2014-01-07 Conformis, Inc. Patient selectable joint arthroplasty devices and surgical tools incorporating anatomical relief
AT504264T (en) 2001-05-25 2011-04-15 Conformis Inc Methods and compositions for repair of the surface of joints
US8545569B2 (en) 2001-05-25 2013-10-01 Conformis, Inc. Patient selectable knee arthroplasty devices
US9603711B2 (en) 2001-05-25 2017-03-28 Conformis, Inc. Patient-adapted and improved articular implants, designs and related guide tools
US8083745B2 (en) 2001-05-25 2011-12-27 Conformis, Inc. Surgical tools for arthroplasty
US8882847B2 (en) 2001-05-25 2014-11-11 Conformis, Inc. Patient selectable knee joint arthroplasty devices
US8234097B2 (en) 2001-05-25 2012-07-31 Conformis, Inc. Automated systems for manufacturing patient-specific orthopedic implants and instrumentation
US8480754B2 (en) 2001-05-25 2013-07-09 Conformis, Inc. Patient-adapted and improved articular implants, designs and related guide tools
TWI231755B (en) 2002-10-07 2005-05-01 Conformis Inc An interpositional articular implant and the method for making the same
EP3075356A1 (en) 2002-11-07 2016-10-05 ConforMIS, Inc. Method for determining meniscal size and shape and for devising
CA2641241A1 (en) 2006-02-06 2007-08-16 Conformis, Inc. Patient selectable joint arthroplasty devices and surgical tools
DE102006051393B4 (en) * 2006-10-27 2008-08-28 Krehl, Frieder W., Dr. A joint endoprosthesis
WO2008101090A2 (en) 2007-02-14 2008-08-21 Conformis, Inc. Implant device and method for manufacture
US20080221680A1 (en) * 2007-03-09 2008-09-11 Zimmer Technology, Inc. Optimized articular geometry
WO2008157412A2 (en) 2007-06-13 2008-12-24 Conformis, Inc. Surgical cutting guide
WO2009111626A2 (en) 2008-03-05 2009-09-11 Conformis, Inc. Implants for altering wear patterns of articular surfaces
AU2009246474B2 (en) 2008-05-12 2015-04-16 Conformis, Inc. Devices and methods for treatment of facet and other joints
EP2163225A1 (en) * 2008-09-11 2010-03-17 Aequos Endoprothetik Gmbh Artificial joint with a polymer function body
US8808303B2 (en) 2009-02-24 2014-08-19 Microport Orthopedics Holdings Inc. Orthopedic surgical guide
US9017334B2 (en) 2009-02-24 2015-04-28 Microport Orthopedics Holdings Inc. Patient specific surgical guide locator and mount
US8808297B2 (en) 2009-02-24 2014-08-19 Microport Orthopedics Holdings Inc. Orthopedic surgical guide
CN102448394B (en) 2009-04-16 2015-07-22 康复米斯公司 Patient-specific joint arthroplasty devices for ligament repair
CA2782137A1 (en) 2009-12-11 2011-06-16 Conformis, Inc. Patient-specific and patient-engineered orthopedic implants
AU2012217654B2 (en) 2011-02-15 2016-09-22 Conformis, Inc. Patient-adapted and improved articular implants, procedures and tools to address, assess, correct, modify and/or accommodate anatomical variation and/or asymmetry
US9486226B2 (en) 2012-04-18 2016-11-08 Conformis, Inc. Tibial guides, tools, and techniques for resecting the tibial plateau
US9675471B2 (en) 2012-06-11 2017-06-13 Conformis, Inc. Devices, techniques and methods for assessing joint spacing, balancing soft tissues and obtaining desired kinematics for joint implant components

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2803191A1 (en) * 2000-01-04 2001-07-06 Bernard Wirth Intra-articulatary surgical prosthesis has plastics cup screwed into place and formed of casing separated from multiple layer lining by fluid gap
FR2803190A1 (en) * 2000-01-04 2001-07-06 Bernard Wirth Prosthesis for joints comprises a deformable pocket divided in compartments with doubler and filled with a material

Also Published As

Publication number Publication date
DE29916589U1 (en) 2000-01-13
WO1999042061A1 (en) 1999-08-26

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Legal Events

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OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8139 Disposal/non-payment of the annual fee