FR2633510A1 - Femoral prosthesis device with distal stress dampers - Google Patents

Femoral prosthesis device with distal stress dampers Download PDF

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Publication number
FR2633510A1
FR2633510A1 FR8809122A FR8809122A FR2633510A1 FR 2633510 A1 FR2633510 A1 FR 2633510A1 FR 8809122 A FR8809122 A FR 8809122A FR 8809122 A FR8809122 A FR 8809122A FR 2633510 A1 FR2633510 A1 FR 2633510A1
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France
Prior art keywords
prosthesis
femoral prosthesis
distal
dampers
rod
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Withdrawn
Application number
FR8809122A
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French (fr)
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Individual
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Individual
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Priority to FR8809122A priority Critical patent/FR2633510A1/en
Publication of FR2633510A1 publication Critical patent/FR2633510A1/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Withdrawn legal-status Critical Current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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • 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
    • A61F2/3662—Femoral shafts
    • A61F2/367—Proximal or metaphyseal parts of shafts
    • 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
    • A61F2/3662—Femoral shafts
    • A61F2/3676—Distal or diaphyseal parts of shafts
    • 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
    • A61F2002/30563—Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
    • 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
    • A61F2002/30594—Special structural features of bone or joint prostheses not otherwise provided for slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30884—Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity

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

The subject of the present invention is a femoral prosthesis device with distal stress dampers. The device according to the invention consists of the combination of a femoral prosthesis 1 with a medullary rod 5, comprising at least one longitudinal slot 8 in its distal part, and of the filling of this slot, or of these slots, with a silicone-based elastomer or the like. It is intended to be used in orthopaedic surgery, in particular in the field of hip prostheses.

Description

DISPOSITIF DE PROTHESE FEMORALE A AMORTISSEURS DE
CONTRAINTES DISTALES
La présente invention a pour objet un dispositif de prothèse fémorale à amortisseurs de contraintes distales.FEMALE PROSTHESIS DEVICE WITH SHOCK ABSORBERS
DISTAL CONSTRAINTS
The present invention relates to a femoral prosthesis device with distal stress absorbers.

Il est destiné à être utilisé en chirurgie orthopédique, en particulier dans le cadre des prothèses de la hanche.It is intended to be used in orthopedic surgery, in particular in connection with hip prostheses.

Dans les dispositifs connus de ce genre, il est fait appel à deux principes de base, la fixation de la prothèse sur le fémur par scellement au ciment chirurgical et la fixation sans scellement dite "sans ciment".In known devices of this kind, use is made of two basic principles, the fixing of the prosthesis on the femur by sealing with surgical cement and the fixing without sealing known as "without cement".

Dans tous les cas, l'expérience a prouvé que les contraintes avaient tendance à se concentrer à la pointe distale de la prothèse fémorale. De ce fait, et en ce qui concerne les fixations sans ciment, on recherche un ancrage maximum dans la partie haute métaphysaire du fémur et on diminue la taille de la portion distale de la tige fémorale, ce qui rend ce type de prothèse non satisfaisante lorsque l'on veut les utiliser avec ciment.In all cases, experience has shown that the stresses tend to concentrate at the distal tip of the femoral prosthesis. Therefore, and with regard to cementless fasteners, we seek maximum anchorage in the upper metaphyseal part of the femur and we reduce the size of the distal portion of the femoral stem, which makes this type of prosthesis unsatisfactory when we want to use them with cement.

Lorsque l'on augmente la taille de cette portion distale de la prothèse, on s'expose à une concentration des forces à ce niveau, due à une trop grande rigidité de cette zone, ce qui se traduit par des douleurs fémorales basses bien connues des chirurgiens ("stress shielding" en anglais), ainsi que par une déminéralisation osseuse à la pointe de la prothèse entraînant une fragilisation.When we increase the size of this distal portion of the prosthesis, we are exposed to a concentration of forces at this level, due to too great rigidity of this area, which results in low femoral pain well known to surgeons ("stress shielding" in English), as well as by bone demineralization at the tip of the prosthesis resulting in embrittlement.

Pour tenter d'éviter ces phénomènes, qui peuvent se rencontrer avec des prothèses scellées et non scellées, un artifice technique consiste à faire une fente longitudinale dans la queue de la prothèse, de manière à diminuer sa rigidité; L'inconvénient de cette fente est qu'elle se remplit de ciment si l'on scelle la prothèse ou d'éléments osseux dans le cas contraire. Cette zone perd alors son élasticité du fait du remplissage de la fente.To try to avoid these phenomena, which can be encountered with sealed and unsealed prostheses, a technical device consists in making a longitudinal slit in the tail of the prosthesis, so as to reduce its rigidity; The disadvantage of this slit is that it fills with cement if the prosthesis is sealed or with bone elements otherwise. This area then loses its elasticity due to the filling of the slot.

La présente invention se propose de remédier à ces inconvénients par la réalisation d'un amortisseur de contraintes au niveau de la queue prothétique pour obtenir ainsi une bonne adaptation os/prothèse, en utilisant le principe de la tige médullaire fendue, tout en conservant ses propriétés élastiques dans le temps en empêchant l'envahissement de la fente par des éléments osseux ou par le ciment de fixation. The present invention proposes to remedy these drawbacks by producing a stress absorber at the level of the prosthetic tail, thereby obtaining good bone / prosthesis adaptation, using the principle of the split medullary rod, while retaining its properties. elastic over time by preventing invasion of the slit by bone elements or by the fixing cement.

Le dispositif suivant l'invention est constitué par la combinaison d'une prothèse fémorale à tige médullaire comportant au moins une fente longitudinale dans sa partie distale, et du remplissage de cette fente, ou de ces fentes, avec un élastomère à base de silicone ou similaire.The device according to the invention consists of the combination of a femoral prosthesis with a medullary rod comprising at least one longitudinal slot in its distal part, and of the filling of this slot, or of these slots, with a silicone-based elastomer or similar.

Sur les dessins annexés, donnés à titre d'exemple non limitatif, d'une des formes de l'invention
La figure 1 montre une vue avant du dispositif équipé de la tête fémorale.In the accompanying drawings, given by way of nonlimiting example, of one of the forms of the invention
Figure 1 shows a front view of the device equipped with the femoral head.

La figure 2 montre une vue latérale sans tête fémorale
La figure 3 montre une vue de dessus, avec tête fémorale.Figure 2 shows a side view without a femoral head
Figure 3 shows a top view, with femoral head.

Le dispositif, figure 1 à 3, est constitué d'un corps de prothèse 1 constitué d'un col 2 terminé par une partie tronconique 3, sur laquelle se monte à la rotule L, et d'une tige médullaire autobloquante 5 comportant un aileron trochantérien anti-rotatoire 6. La pointe 7 de la tige 5 est pourvue d'une fente longitudinale 8 remplie d'un élastomère à base de silicone 9 de manière à éviter la pénétration de débris de ciment ou d'os qui empêcheraient cette fente de jouer un rôle d'amortisseur élastique des contraintes.The device, Figure 1 to 3, consists of a prosthesis body 1 consisting of a neck 2 terminated by a frustoconical part 3, on which is mounted to the ball joint L, and a self-locking medullary rod 5 comprising a fin anti-rotational trochanteric 6. The tip 7 of the rod 5 is provided with a longitudinal slot 8 filled with a silicone-based elastomer 9 so as to avoid the penetration of cement or bone debris which would prevent this slot from play a role of elastic shock absorber.

Le dispositif, objet de l'invention, peut être utilisé dans tous les cas où une prothèse de hanche peut être fixée sur le fémur par une tige médullaire. Il peut convenir aussi bien dans les cas de fixation par scellement que dans les cas de fixation sans ciment. Le principe peut être appliqué à toutes les prothèses existantes, dans la mesure où elles sont pourvues d'une fente longitudinale. The device, object of the invention, can be used in all cases where a hip prosthesis can be fixed on the femur by a medullary rod. It can be used both in case of fixing by sealing and in case of fixing without cement. The principle can be applied to all existing prostheses, as long as they have a longitudinal slot.

Le positionnement des divers éléments constitutifs donnent à ce dispositif un maximum d'effets utiles qui n'avaient pas été obtenus à ce jour par des dispositifs similaires.The positioning of the various constituent elements gives this device a maximum of useful effects which had not been obtained to date by similar devices.

Cependant, les formes, dimensions et dispositions des différents éléments, ainsi que les matières utilisées pour leur fabrication pourront varier dans la limite des équivalents, sans changer pour cela, la conception générale de l'invention qui vient d'être décrite. However, the shapes, dimensions and arrangements of the various elements, as well as the materials used for their manufacture may vary within the limit of equivalents, without changing the general design of the invention which has just been described.

Claims (2)

REVENDICATIONS 10 Dispositif de prothèse fémorale à amortisseurs de contraintes distales, destiné à être utilisé en chirurgie orthopédique, en particulier dans le cadre des prothèses de la hanche pour améliorer l'élasticité de la tige médullaire de la prothèse et obtenir ainsi une bonne adaptation os/prothèse, caractérisé par la combinaison d'un corps de prothèse (1) constitué d'un col (2) pouvant recevoir une tête fémorale (3, 4), et d'une tige médullaire auto-bloquante (5) dont la queue (7) pourvue d'au moins une fente longitudinale (8) remplie d'un élastomère à base de silicone ou similaire (9), dont le rôle est d'empêcher la perte d'élasticité de la tige (5) provoquée par la pénétration du ciment de fixation ou d'éléments osseux.10 Femoral prosthesis device with distal stress absorbers, intended for use in orthopedic surgery, in particular within the framework of hip prostheses to improve the elasticity of the medullary stem of the prosthesis and thus obtain good bone / prosthesis adaptation , characterized by the combination of a prosthesis body (1) consisting of a neck (2) able to receive a femoral head (3, 4), and a self-locking medullary rod (5), the tail (7 ) provided with at least one longitudinal slot (8) filled with a silicone-based elastomer or the like (9), the role of which is to prevent the loss of elasticity of the rod (5) caused by the penetration of the fixing cement or bone elements. 20 Dispositif suivant la revendication 1, se caractérisant par le fait que la tige médullaire (5) de la prothèse comporte en partie haute un aileron trochantérien anti-rotatoire (6).  20 Device according to claim 1, characterized in that the medullary rod (5) of the prosthesis comprises in the upper part an anti-rotational trochanteric fin (6).
FR8809122A 1988-07-01 1988-07-01 Femoral prosthesis device with distal stress dampers Withdrawn FR2633510A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8809122A FR2633510A1 (en) 1988-07-01 1988-07-01 Femoral prosthesis device with distal stress dampers

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Application Number Priority Date Filing Date Title
FR8809122A FR2633510A1 (en) 1988-07-01 1988-07-01 Femoral prosthesis device with distal stress dampers

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FR2633510A1 true FR2633510A1 (en) 1990-01-05

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FR8809122A Withdrawn FR2633510A1 (en) 1988-07-01 1988-07-01 Femoral prosthesis device with distal stress dampers

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0486422A1 (en) * 1990-11-16 1992-05-20 SULZER Medizinaltechnik AG Anchoring shaft for a femoral head prosthesis
US5456717A (en) * 1992-12-07 1995-10-10 Plus Endoprothtik Ag Stem for a femoral hip-joint endoprosthesis
US7238208B2 (en) 1995-06-08 2007-07-03 Depuy Products, Inc. Large taper modular shoulder prosthesis

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2078523A (en) * 1980-06-25 1982-01-13 Lord Corp Hip joint prosthesis
FR2583286A1 (en) * 1985-06-14 1986-12-19 Botton Gerard De Femoral prosthesis, femoral piece for such a prosthesis and instrument for positioning the prosthesis
EP0145938B1 (en) * 1983-11-30 1988-05-18 Protek AG Intramedullary prosthesis

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2078523A (en) * 1980-06-25 1982-01-13 Lord Corp Hip joint prosthesis
EP0145938B1 (en) * 1983-11-30 1988-05-18 Protek AG Intramedullary prosthesis
FR2583286A1 (en) * 1985-06-14 1986-12-19 Botton Gerard De Femoral prosthesis, femoral piece for such a prosthesis and instrument for positioning the prosthesis

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0486422A1 (en) * 1990-11-16 1992-05-20 SULZER Medizinaltechnik AG Anchoring shaft for a femoral head prosthesis
US5192331A (en) * 1990-11-16 1993-03-09 Sulzer Brothers Limited Shank for a femur head prosthesis
US5456717A (en) * 1992-12-07 1995-10-10 Plus Endoprothtik Ag Stem for a femoral hip-joint endoprosthesis
US7238208B2 (en) 1995-06-08 2007-07-03 Depuy Products, Inc. Large taper modular shoulder prosthesis

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