WO1996015736A1 - Endoprothese de l'articulation de la hanche anisotropiquement elastique - Google Patents

Endoprothese de l'articulation de la hanche anisotropiquement elastique Download PDF

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Publication number
WO1996015736A1
WO1996015736A1 PCT/DE1995/001630 DE9501630W WO9615736A1 WO 1996015736 A1 WO1996015736 A1 WO 1996015736A1 DE 9501630 W DE9501630 W DE 9501630W WO 9615736 A1 WO9615736 A1 WO 9615736A1
Authority
WO
WIPO (PCT)
Prior art keywords
hip joint
elastic
core
shaft
joint endoprosthesis
Prior art date
Application number
PCT/DE1995/001630
Other languages
German (de)
English (en)
Inventor
Gerd Hörmansdörfer
Wulf-Dieter Schellmann
Original Assignee
Hoermansdoerfer Gerd
Schellmann Wulf Dieter
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
Priority to DE4441695A priority Critical patent/DE4441695A1/de
Application filed by Hoermansdoerfer Gerd, Schellmann Wulf Dieter filed Critical Hoermansdoerfer Gerd
Publication of WO1996015736A1 publication Critical patent/WO1996015736A1/fr

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    • 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
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0018—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
    • 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
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0026—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in surface structures
    • 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
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0036—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in thickness
    • 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
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Definitions

  • the invention relates to a special hip joint endoprosthesis for use in human medicine for the optional implantation with or without cement.
  • Such hip joint endoprostheses are known in various embodiments. They usually consist of a shaft for insertion into the upper medullary cavity of the thigh (femur), an adjoining neck and a spherical joint head, with the joint head being attachable in modern designs via a standardized cone. There are also known designs which have a collar between the shaft and neck in order to realize a support on the resection surface of the femur.
  • the known shafts of such hip joint endoprostheses are in their dimensions and shape the anatomical conditions of the upper medullary cavity of the femur more or less roughly approximated and usually consist of solid metal. It is customary to structure the surface of such shafts in order to achieve the most stable anchoring in the bony bearing.
  • finer structures have a favorable influence on the primary fixation, while finer structures, for example by sandblasting or in the form of a coating made of porous metal, promote a so-called injection of bone substance the Improve secondary fixation of the implant.
  • a hip joint shaft belonging to the second group mentioned is known, for example, from German patent application OS-DE 3737372 A1. It essentially consists of a helical spring-like element made of metal, which corresponds in its outer contour to the shape of known shafts. The shaft derives its elasticity from the geometry of the coil spring-like element, this elasticity due to the material, the material thickness, the pitch of the winding, etc. is adjustable.
  • such a shaft has quasi-isotropic elastic properties, which are expressed both in terms of elastic flexibility and elastic extensibility, or, depending on the winding distance, also elastic compressibility. In fact, such behavior is only partially congruent with that of the bony femur.
  • the hip joint shaft according to the above-mentioned patent application is moreover designed too elastic in the area of the main force introduction below the collar and at the start of the winding there is extremely prone to breakage due to the alternating bending load occurring during use. In the case of loosening, it should also be extremely difficult to remove such a resilient shaft from the medullary cavity.
  • hip joint endoprostheses there was therefore the task of creating an implant with a characteristic that was better adapted to the femur in terms of its elasticity.
  • the concept should also reliably rule out a risk of breakage of the artificial shaft and enable problem-free explanting in the event of loosening.
  • the basic idea according to the invention is now to equip such a hip joint endoprosthesis, deviating from previous designs, with an anisotropically elastic characteristic which approximates that of the femur and thereby takes into account the alternating relationships between the shaft and the femur with regard to the transmitted forces and bending moments.
  • the practical implementation of the invention concentrates on realizing the desired characteristic by means of a functional breakdown of the shaft. According to this, at least the lower area of the shaft consists of a slender core with an axial extension, which is firmly connected with a special elastic covering.
  • the slender core is designed to take on the function of an elastic element with pronounced anisotropy, which is characterized by a very high degree of rigidity in the axial and radial directions and at the same time good elastic flexibility.
  • the special elastic covering of the core is optimized in terms of its mechanical properties for greater axial elasticity with radial rigidity.
  • the overall anisotropically elastic characteristic of the hip joint endoprosthesis according to the invention results from the summation of the properties of both functional elements.
  • Fig.l shows a hip joint shaft according to the invention, in which the functional breakdown to achieve the desired anisotropic elasticity is realized by means of special processing.
  • FIG. 1 The example of a shaft according to the invention presented in drawing FIG. 1 is a monoblock design which can be produced from a metallic blank, for example from titanium alloy.
  • the upper end is provided with a collar 3. This merges into a cone-shaped neck 1 with a rounding.
  • the neck in turn opens into a cone 2, onto which the conventional ball heads can be attached.
  • the entire area of the implantable length has been cut open in order to better illustrate the structural design.
  • the shaft has a more or less central core 8, which increases in cross-section at the top and smoothly merges into the solid body 9, or tapers increasingly towards the bottom.
  • This geometry is matched to the mechanical load on the shaft and the load-bearing capacity of the material used and is designed so that the core is extraordinarily rigid on the one hand, but on the other hand is increasingly flexible towards the bottom by being there over a very long length / Diameter ratio.
  • a sheath 10, 11 with special elastic properties is superimposed on the core 8 of the shaft.
  • this has the function of a placeholder by realizing the desired outer shape of the shaft with its outer surface. It is intended to transmit forces between the core 8 and femur. On the other hand, it must not impair the elastic flexibility of the core too much and must therefore have a high degree of axial elasticity. In addition, it must be sufficiently strong and unbreakable.
  • these properties were achieved in that a helical groove was machined from the solid shaft with the desired outer contour. This begins at 4 below the collar 3 and continues to 5, or via 6 to its outlet 7. The beginning of the groove can be moved further up, for example to structure the body by means of the turning ice.
  • the depth of this groove, as well as its width and slope, has an impact on the rigidity of the overall system and the anisotropy of its elasticity. It is designed in such a way that a sufficiently large cross section of the core is retained and at the same time an adapted increase in this cross section results from the shaft end to the collar.
  • the dimensions selected in the drawing figure have more symbolic meaning because there is a certain constructive range for the actual definition.
  • the spiral groove with multiple threads, to change its slope smoothly, or to plunge eccentrically in order to achieve a certain elasticity characteristic of the shaft.
  • the hip joint endoprosthesis according to the invention is primarily intended for cementless implantation.
  • the bony bearing in the medullary canal is prepared in the usual way by means of suitable rasps and the shaft is driven in with slight pretension until the collar is put on.
  • Collarless variants can be introduced in a similar manner.
  • a piping or piping-like flexible hose made of a physiologically harmless material, e.g. made of PEEK (polyether ether ketone) or the like to prevent the bone cement from penetrating.
  • the inventive basic idea of an axially stiff, but over a defined extension of relatively flexurally elastic shaft, consisting of the corresponding functional construction elements core and casing can be put into practice in a variety of configurations and is not limited to the above-mentioned embodiment.
  • the desired anisotropically elastic characteristic is achieved by modifying the turning tion, for example adjustment of the pitch, number of gears, depth, width and penetration angle of the groove, or the fluid change in the various parameters can be set within a wide range and realized using known manufacturing processes at low costs.
  • the hip joint endoprosthesis made available with the invention promises a substantially improved adaptation to the elastic characteristics of the bone system involved and thus good prerequisites for long-term and symptom-free usability of such an implant.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (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

L'invention concerne une endoprothèse particulière de l'articulation de la hanche, destinée à remplacer artificiellement cette articulation chez un être humain. Les endoprothèses de l'articulation de la hanche de la technique antérieure sont soit rigides soit plus ou moins isotropiquement élastiques. Leur comportement élastique n'est pas adapté à celui du système osseux concerné, ce qui peut entraîner des transformations osseuses ou un relâchement de l'implant. L'endoprothèse de l'articulation de la hanche selon l'invention présente une propriété anisotropiquement élastique nettement plus proche du comportement du fémur. On obtient la propriété anisotropiquement élastique recherchée en divisant la tige de l'endoprothèse de l'articulation de la hanche, au moins dans sa partie inférieure, en deux zones fonctionnelles, à savoir une partie centrale (8) et une enveloppe (10, 11). La partie centrale (8) est relativement élastique en flexion tout en présentant une rigidité élevée dans le sens axial et radial, tandis que l'enveloppe (10, 11) entourant la partie centrale (8) est souple dans le sens axial tout en présentant une rigidité dans le sens radial. L'endoprothèse de l'articulation de la hanche selon l'invention devrait présenter une durée d'utilisation nettement plus longue et être moins pénible.
PCT/DE1995/001630 1994-11-23 1995-11-22 Endoprothese de l'articulation de la hanche anisotropiquement elastique WO1996015736A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4441695A DE4441695A1 (de) 1994-11-23 1994-11-23 Anisotrop elastische Hüftgelenk-Endoprothese

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4441695A DE4441695A1 (de) 1994-11-23 1994-11-23 Anisotrop elastische Hüftgelenk-Endoprothese
DEP4441695.4 1994-11-23

Publications (1)

Publication Number Publication Date
WO1996015736A1 true WO1996015736A1 (fr) 1996-05-30

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Application Number Title Priority Date Filing Date
PCT/DE1995/001630 WO1996015736A1 (fr) 1994-11-23 1995-11-22 Endoprothese de l'articulation de la hanche anisotropiquement elastique

Country Status (2)

Country Link
DE (1) DE4441695A1 (fr)
WO (1) WO1996015736A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29810818U1 (de) * 1998-06-17 1999-10-28 Trumpf Gmbh & Co Zementfrei implantierbare Endoprothese aus Metall
WO2001064139A3 (fr) * 2000-02-29 2002-02-07 Hammill Mfg Co Prothese articulaire dotee d'une flexibilite variable
US7033399B2 (en) 2003-08-22 2006-04-25 Ortho Innovations, Inc. Welded hip prosthesis

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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DE19619166C2 (de) * 1996-05-11 1999-06-02 Heraeus Kulzer Gmbh Halbzeug zur paßgenauen Herstellung einer zum implantierenden Prothese
PL219087B1 (pl) 2009-07-06 2015-03-31 Leszek Tadeusz Olbrzymek Ledo P P H U Elastyczna endoproteza stawu, zwłaszcza stawu biodrowego

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EP0019044A1 (fr) * 1979-05-19 1980-11-26 Sigri Elektrographit Gmbh Tige fémorale d'une endoprothèse de la hanche et procédé pour sa fabrication
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FR2610512A1 (fr) * 1987-02-06 1988-08-12 Cuilleron J Procede et moyens d'ancrage d'elements d'implants visses dans les tissus osseux et les elements d'implants obtenus
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US4808186A (en) * 1988-02-02 1989-02-28 Boehringer Mannheim Corporation Controlled stiffness femoral hip implant
EP0543099A2 (fr) * 1991-11-19 1993-05-26 Bristol-Myers Squibb Company Tige pour fixer un implant

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DE3800259A1 (de) * 1988-01-05 1989-07-13 Mecron Med Prod Gmbh Implantierbare prothese
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FR2331320A1 (fr) * 1975-11-14 1977-06-10 Gen Atomic Co Prothese a region poreuse realisee par ressort a boudin et procede de preparation y associe
EP0019044A1 (fr) * 1979-05-19 1980-11-26 Sigri Elektrographit Gmbh Tige fémorale d'une endoprothèse de la hanche et procédé pour sa fabrication
US4292695A (en) * 1980-06-25 1981-10-06 Lord Corporation Prosthesis stem
DE3737372A1 (de) * 1986-11-17 1988-07-28 Thull Roger Implantierbare hueftgelenksprothese
FR2610512A1 (fr) * 1987-02-06 1988-08-12 Cuilleron J Procede et moyens d'ancrage d'elements d'implants visses dans les tissus osseux et les elements d'implants obtenus
DE3716026A1 (de) * 1987-05-14 1988-12-01 S & G Implants Gmbh Verfahren zur herstellung einer gelenkendoprothese
US4808186A (en) * 1988-02-02 1989-02-28 Boehringer Mannheim Corporation Controlled stiffness femoral hip implant
EP0543099A2 (fr) * 1991-11-19 1993-05-26 Bristol-Myers Squibb Company Tige pour fixer un implant

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29810818U1 (de) * 1998-06-17 1999-10-28 Trumpf Gmbh & Co Zementfrei implantierbare Endoprothese aus Metall
WO2001064139A3 (fr) * 2000-02-29 2002-02-07 Hammill Mfg Co Prothese articulaire dotee d'une flexibilite variable
US7033399B2 (en) 2003-08-22 2006-04-25 Ortho Innovations, Inc. Welded hip prosthesis

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