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
knee joint
femur
inlet
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Withdrawn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
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE1998107603 priority Critical patent/DE19807603A1/en
Priority to DE29916589U priority patent/DE29916589U1/en
Priority to PCT/EP1999/000947 priority patent/WO1999042061A1/en
Publication of DE19807603A1 publication Critical patent/DE19807603A1/en
Withdrawn legal-status Critical Current

Links

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
    • A61F2/38—Joints for elbows or knees
    • A61F2/389—Tibial components
    • 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
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30581—Special structural features of bone or joint prostheses not otherwise provided for having a pocket filled with fluid, e.g. liquid

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

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 the claim 1.

Der Bewegungsablauf eines natürlichen Kniegelenkes setzt sich aus Gleit- und Abrollbewegungen zusammen. Ermöglicht wird dies unter anderem durch die spezielle Anatomie des unteren Endes des Oberschenkelknochens. Hier nimmt der Radius von vorn nach hinten ab; die Krümmungsmittelpunkte liegen auf einer Spirallinie.The movement sequence of a natural knee joint consists of sliding and Rolling movements together. This is made possible by the special anatomy of the lower end of the femur. Here the Radius from front to back; the centers of curvature lie on one Spiral line.

Kniegelenksendoprothesen imitieren den natürlichen Bewegungsablauf. Die Auflagefläche des Unterschenkelteils besteht meist aus einem leicht konkav geformten starren Polyäthylen-Inlay. Die Radius der Konkavität ist größer als die je nach Beugestellung variable Konvexität des Oberschenkelteils, um ein Abrollen zu erreichen.Knee joint endoprostheses imitate the natural sequence of movements. The The contact surface of the lower leg part usually consists of a slightly concave molded rigid polyethylene inlay. The radius of the concavity is larger than ever after bending, variable convexity of the thigh part in order to unroll to reach.

Dadurch ergibt sich zwangsläufig eine nur kleine, punkt- bis linienförmige Auflagefläche. Es resultiert Abrieb und Kaltfluß des Polyäthylens. Einerseits stellen die Abriebprodukte einen permanenten Entzündungsherd im Kniegelenk dar. Andrerseits wird die Prothese dem Anspruch nach reibungsarmem Lauf nicht mehr gerecht. Es wirken verstärkt Kräfte auf die Prothesen-Knochengrenze, die eine Lockerung begünstigen.This inevitably results in only a small, point to line shape Contact surface. The result is abrasion and cold flow of the polyethylene. On the one hand, the Abrasion products are a permanent source of inflammation in the knee joint. On the other hand, the prosthesis no longer meets the requirement for smooth running fair. Forces act on the prosthesis-bone boundary, the one Favor loosening.

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 the bearing surface of the thigh part on the inlay to enlarge and minimize the problems mentioned.

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 solved.

Dabei ist das Inlay keine starre Fläche, sondern besteht beispielsweise aus einzelnen, noppenartig aufgeteilten Flächen, die auf einem flexiblen Träger fixiert sind. Diese Konstruktion ruht auf einem niedrigen, mit Fluid, z. B. Gel gefüllten Kissen, jeweils getrennt für Innen- und Außenseite. Dieses Fluid verteilt die einwirkenden Kräfte gleichmäßig auf die Auflagefläche.The inlay is not a rigid surface, but consists, for example, of individual, knob-like surfaces that are fixed on a flexible support. This Construction rests on a low, fluid, e.g. B. Gel filled pillows, each separate for inside and outside. This fluid distributes the acting forces evenly on the contact surface.

Die flexible Auflage dieses Inlays paßt sich je nach Gelenkstellung dem veränderten Radius an. Die Auflagefläche wird vergrößert. Durch die gleichmäßige Verteilung werden punktförmige Spitzenkräfte vermieden. Abrieb und Kaltfluß werden deutlich verringert. Dadurch, daß das Volumen des Fluids sich nicht ändert, wird kein elastischer Puffer erzeugt, der eine Instabilität fördern könnte. The flexible support of this inlay adapts to the changed one depending on the joint position Radius. The contact area is enlarged. Through the even distribution punctiform peak forces are avoided. Abrasion and cold flow become clear decreased. Because the volume of the fluid does not change, none becomes creates elastic buffers that could promote instability.  

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

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

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

Das Inlay besteht aus einer Umfassung (1) der üblichen Form. Die für Innen- und Außenseite getrennten Auflageflächen sind flexibel. Sie bestehen z. B. aus Noppen 2, die auf einem beweglichen Träger 3, z. B. einem Titannetz fixiert sind. Gestützt wird die Auflagefläche jeweils durch ein Kissen, bestehend aus Fluid 4, z. B. Gel, und einer Ummantelung 5.The inlay consists of an enclosure ( 1 ) of the usual form. The separate surfaces for the inside and outside are flexible. They exist e.g. B. from knobs 2 , which on a movable support 3 , z. B. are fixed to a titanium mesh. The support surface is supported by a cushion consisting of fluid 4 , for. B. gel, and a coating 5 .

In einer nicht dargestellten Ausführung ist die Auflagefläche jeweils als geschlossene, flexible Fläche ausgebildet. In einer ebenfalls nicht dargestellten Ausführung wird die Auflagefläche durch Querrippen gebildet. In einer ebenfalls nicht dargestellten Ausführung sind Noppen bzw. Rippen und Träger einteilig, z. B. aus Polyäthylen geformt. In an embodiment not shown, the contact surface is in each case a closed, flexible area. In an embodiment, also not shown, the Support surface formed by cross ribs. In a likewise not shown Design knobs or ribs and carrier are in one piece, z. B. made of polyethylene shaped.  

BezugszeichenlisteReference list

11

Umfassung
Embracing

22nd

Noppen
Pimples

33rd

beweglicher Träger
movable carrier

44th

Fluid
Fluid

55

Ummantelung
Sheathing

Claims (6)

1. Inlay für Kniegelenksendoprothesen, dadurch gekennzeichnet, daß die Auflageflächen sich jeweils flexibel dem Radius des Oberschenkelteils anpassen.1. Inlay for knee joint endoprostheses, characterized in that the contact surfaces each adapt flexibly to the radius of the thigh 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 acting forces evenly distributed on the surface by a fluid become. 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 pillows ( 4 ) carry the flexible surfaces for the inside and outside. 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 consists of knobs ( 2 ) which are fixed on a movable carrier ( 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 is formed by ribs which are fixed on a movable support ( 3 ). 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 bearing surface as closed, but flexibly adapting to the radius of the thigh part Surface is formed.
DE1998107603 1998-02-17 1998-02-17 Inlet for knee joint endoprosthesis adjusts flexible to radius of femur Withdrawn DE19807603A1 (en)

Priority Applications (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
DE29916589U DE29916589U1 (en) 1998-02-17 1999-02-12 Joint prosthesis
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

Applications Claiming Priority (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

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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US8480754B2 (en) 2001-05-25 2013-07-09 Conformis, Inc. Patient-adapted and improved articular implants, designs and related guide tools
US9603711B2 (en) 2001-05-25 2017-03-28 Conformis, Inc. Patient-adapted and improved articular implants, designs and related guide tools
US10085839B2 (en) 2004-01-05 2018-10-02 Conformis, Inc. Patient-specific and patient-engineered orthopedic implants
US8545569B2 (en) 2001-05-25 2013-10-01 Conformis, Inc. Patient selectable knee arthroplasty devices
US20030055502A1 (en) 2001-05-25 2003-03-20 Philipp Lang Methods and compositions for articular resurfacing
US7534263B2 (en) 2001-05-25 2009-05-19 Conformis, Inc. Surgical tools facilitating increased accuracy, speed and simplicity in performing joint arthroplasty
US7468075B2 (en) 2001-05-25 2008-12-23 Conformis, Inc. Methods and compositions for articular repair
US8882847B2 (en) 2001-05-25 2014-11-11 Conformis, Inc. Patient selectable knee joint arthroplasty devices
US8556983B2 (en) 2001-05-25 2013-10-15 Conformis, Inc. Patient-adapted and improved orthopedic implants, designs and related tools
US8083745B2 (en) 2001-05-25 2011-12-27 Conformis, Inc. Surgical tools for arthroplasty
US7239908B1 (en) 1998-09-14 2007-07-03 The Board Of Trustees Of The Leland Stanford Junior University Assessing the condition of a joint and devising treatment
JP2002532126A (en) 1998-09-14 2002-10-02 スタンフォード ユニバーシティ Joint condition evaluation and damage prevention device
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
US8951260B2 (en) 2001-05-25 2015-02-10 Conformis, Inc. Surgical cutting guide
CA2501041A1 (en) 2002-10-07 2004-04-22 Conformis, Inc. Minimally invasive joint implant with 3-dimensional geometry matching the articular surfaces
US7796791B2 (en) 2002-11-07 2010-09-14 Conformis, Inc. Methods for determining meniscal size and shape and for devising treatment
US8623026B2 (en) 2006-02-06 2014-01-07 Conformis, Inc. Patient selectable joint arthroplasty devices and surgical tools incorporating anatomical relief
EP2671522A3 (en) 2006-02-06 2013-12-25 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
EP2591756A1 (en) 2007-02-14 2013-05-15 Conformis, Inc. Implant device and method for manufacture
US20080221680A1 (en) * 2007-03-09 2008-09-11 Zimmer Technology, Inc. Optimized articular geometry
US8682052B2 (en) 2008-03-05 2014-03-25 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
EP2405865B1 (en) 2009-02-24 2019-04-17 ConforMIS, Inc. Automated systems for manufacturing patient-specific orthopedic implants and instrumentation
US9017334B2 (en) 2009-02-24 2015-04-28 Microport Orthopedics Holdings Inc. Patient specific surgical guide locator and mount
US8808303B2 (en) 2009-02-24 2014-08-19 Microport Orthopedics Holdings Inc. Orthopedic surgical guide
US8808297B2 (en) 2009-02-24 2014-08-19 Microport Orthopedics Holdings Inc. Orthopedic surgical guide
BRPI1014917A2 (en) 2009-04-16 2016-04-19 Conformis Inc "Patient specific joint arthroplasty devices for ligament repair"
EP2754419B1 (en) 2011-02-15 2024-02-07 ConforMIS, Inc. Patient-adapted and improved orthopedic implants
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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US5201881A (en) * 1991-08-13 1993-04-13 Smith & Nephew Richards Inc. Joint prosthesis with improved shock absorption
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EP0497079A1 (en) * 1991-01-18 1992-08-05 SULZER Medizinaltechnik AG Knee joint prosthesis

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

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