WO2012152464A1 - Arthroprothèse à implantation facilitée, en particulier pour une reconstruction biomécanique de l'articulation coxofémorale - Google Patents

Arthroprothèse à implantation facilitée, en particulier pour une reconstruction biomécanique de l'articulation coxofémorale Download PDF

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Publication number
WO2012152464A1
WO2012152464A1 PCT/EP2012/053740 EP2012053740W WO2012152464A1 WO 2012152464 A1 WO2012152464 A1 WO 2012152464A1 EP 2012053740 W EP2012053740 W EP 2012053740W WO 2012152464 A1 WO2012152464 A1 WO 2012152464A1
Authority
WO
WIPO (PCT)
Prior art keywords
slot
neck
end portion
arthroprosthesis
shank
Prior art date
Application number
PCT/EP2012/053740
Other languages
English (en)
Inventor
Patrizio Cremascoli
Aldo Toni
Original Assignee
Adler Ortho S.R.L.
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 Adler Ortho S.R.L. filed Critical Adler Ortho S.R.L.
Publication of WO2012152464A1 publication Critical patent/WO2012152464A1/fr

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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/3013—Rounded shapes, e.g. with rounded corners figure-"8"- or hourglass-shaped
    • 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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
    • A61F2002/30339—Double cones, i.e. connecting element having two conical connections, one at each of its opposite ends
    • 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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
    • A61F2002/30345—Multiple conical connection, i.e. the protrusion and recess having several tapered sections of different complementary conicities
    • 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
    • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
    • A61F2002/30616—Sets comprising a plurality of prosthetic parts of different sizes or orientations
    • 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
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/365—Connections of heads to necks
    • 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
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3652—Connections of necks to shafts

Definitions

  • the present invention relates to an arthroprosthesis with facilitated implantation, particularly for biomechanical reconstruction of the coxofemoral joint.
  • arthroprostheses for biomechanical reconstruction of the coxofemoral joint, which comprise a femoral shank and a spherical head that can be mutually coupled to each other by way of a conical coupling between a slot and a distal end of a neck which are defined, respectively, in the free end of the femoral shank and on the portion of the spherical head directed toward the free end of the femoral shank.
  • the spherical head is engaged in an artificial cotyloid element that replaces the acetabular cavity.
  • a conventional technique is to provide the femoral shanks and artificial cotyloid elements in standard sizes and geometries so as to have to make only the neck to measure, which at one end is inserted in the proximal end of a femoral shank which is in turn inserted in a bone cavity that is provided artificially in the femur along a usually curvilinear trajectory.
  • a plurality of necks can be provided of different length, lever arm and angle thus enabling the orthopedic surgeon to select the most suitable one for the implant under consideration.
  • the surgeon has to take care to identify the ideal dimensions of the shank and of the cotyloid element according to the anatomical characteristics of the patient to be operated on, in respect of the center of rotation of the femoral head, and can select the dimensions of the neck at another time, even during the actual operation.
  • both the neck and the femoral shank are usually made of technologically advanced alloy, such as alloy of titanium, the possibility of sticking is very high.
  • the aim of the present invention is to eliminate the above mentioned drawbacks, by providing an arthroprosthesis, particularly for biomechanical reconstruction of the coxofemoral joint, that makes it possible to carry out an implant with ease by reducing to the minimum the possibility of incorrect mountings that could result in or increase phenomena of sticking and fatigue as in the known art.
  • Another object of the invention consists in providing an improved arthroprosthesis with facilitated implantation that is capable of offering the widest guarantees of reliability and safety in use.
  • Another object of the invention consists in providing an improved arthroprosthesis with facilitated implantation that is easy to provide and economically competitive when compared to the known art.
  • an improved arthroprosthesis with facilitated implantation particularly for biomechanical reconstruction of the coxofemoral joint, comprising a femoral shank and a spherical head which is accommodated rotatably in an artificial cotyloid element and is associated with said femoral shank by way of a variable-geometry neck which acts as a connection between said shank and said spherical head and has an end portion inserted with mechanical interference in a slot defined in the free end of said femoral shank, said end portion of said neck and said slot defining a conical coupling, characterized in that said slot is substantially frustum-shaped with an end portion, defined at a distance from the bottom of said slot, that has a substantially cylindrical shape in order to prevent said end portion of said neck from jamming or seizing with the walls of said slot if said neck sinks.
  • Figure 1 is a perspective view of an embodiment of an improved arthroprosthesis with facilitated implantation, particularly for biomechanical reconstruction of the coxofemoral joint, according to the invention
  • Figure 2 is an exploded perspective view of the arthroprosthesis shown in Figure 1 ;
  • Figure 3 is an enlarged-scale sectional view of the coupling between the femoral shank and the neck of the arthroprosthesis shown in Figure 1.
  • an improved arthroprosthesis with facilitated implantation particularly for biomechanical reconstruction of the coxofemoral joint, generally designated by the reference numeral 1 , comprises a femoral shank 2, insertable in an artificially provided bone cavity in the femur of a patient, and a spherical head 3 which is accommodated rotatably in an artificial cotyloid element 4 that can be fixed to the hip bone of the patient.
  • the spherical head 3 is associated with the femoral shank 2 by way of a variable-geometry neck 5 that connects the spherical head 3 with the femoral shank 2 and which is provided with an end portion 5a inserted with interference in a slot 6 defined in a free end 2 a of the femoral shank 2.
  • the end portion 5a of the neck 5 and the slot 6 have a substantially frustum-like shape defined around an axis of revolution 7 which coincides with the direction of insertion of the neck 5 in the slot 6 for the definition of a conical coupling.
  • an other end portion 5b of the neck 5 is frustum-shaped with a circular base and is inserted in an adapted cavity 20 defined at the base of the spherical head 3.
  • the slot 6 is substantially frustum-shaped with an end portion 6a that has a substantially cylindrical shape.
  • the cylindrical portion 6a interrupts the conicity of walls of the slot 6 at an edge 10 at a distance 11 from the bottom 8 of the slot 6.
  • Such distance 11 may vary from 1.5 millimeter to 2 millimeters from the bottom 8 of the slot 6.
  • the neck 5 is partially inserted in the cylindrical end portion 6a of the slot 6 along the axis of revolution 7 substantially for a depth that is variable from 0.1 millimeter to 1.5 millimeter.
  • the end portion 5a is provided with a beveled and rounded profile 9.
  • the improved arthroprosthesis with facilitated implantation achieves the intended aim and objects in that, with the particular geometries described, occurrences of jamming of the neck in the slot are prevented.
  • arthroprosthesis consists in that it can be implanted while limiting to the minimum the possibility of decentralized insertions of the neck in the slot defined in the femoral shank, thus ensuring a correct contact between the two of them with consequent increase of the fatigue limit of the components employed, as well as limiting the possibility of sticking between the surfaces in contact.

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 porte sur une arthroprothèse (1) avec une implantation facilitée, en particulier pour la reconstruction biomécanique de l'articulation coxofémorale, comprenant une tige fémorale (2) et une tête sphérique (3) qui est reçue de manière rotative dans un élément cotyloïde artificiel (4) et est associée à la tige fémorale (2) au moyen d'un col à géométrie variable (5) qui agit en tant que liaison entre la tige (2) et la tête sphérique (3), le col (5) ayant une partie d'extrémité (5a) introduite avec une interférence mécanique dans une fente (6) définie dans l'extrémité libre (2a) de la tige fémorale (2), définissant ainsi un couplage conique avec la fente (6), la fente (6) ayant une forme sensiblement tronconique comportant une partie d'extrémité (6a), définie à une distance (11) de la partie inférieure (8) de la fente (6), qui a une forme sensiblement cylindrique de façon à empêcher la partie d'extrémité (5a) du col (5) de se coincer ou de se gripper avec les parois de la fente (6) si le col (5) s'enfonce, la partie d'extrémité cylindrique (6a) interrompant la conicité des parois à une distance (11) de la partie inférieure (8) de la fente (6), permettant ainsi d'empêcher un blocage ou un coinçage de l'extrémité distale de la fente (6) si le col (5) s'enfonce.
PCT/EP2012/053740 2011-05-09 2012-03-05 Arthroprothèse à implantation facilitée, en particulier pour une reconstruction biomécanique de l'articulation coxofémorale WO2012152464A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000782A ITMI20110782A1 (it) 2011-05-09 2011-05-09 Artroprotesi perfezionata ad impianto facilitato, particolarmente per la ricostruzione biomeccanica dell'articolazione coxofemorale.
ITMI2011A000782 2011-05-09

Publications (1)

Publication Number Publication Date
WO2012152464A1 true WO2012152464A1 (fr) 2012-11-15

Family

ID=44554304

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/053740 WO2012152464A1 (fr) 2011-05-09 2012-03-05 Arthroprothèse à implantation facilitée, en particulier pour une reconstruction biomécanique de l'articulation coxofémorale

Country Status (2)

Country Link
IT (1) ITMI20110782A1 (fr)
WO (1) WO2012152464A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5002578A (en) * 1990-05-04 1991-03-26 Venus Corporation Modular hip stem prosthesis apparatus and method
EP1004283A2 (fr) * 1998-11-23 2000-05-31 Johnson & Johnson Professional, Inc. Prothèse modulaire à tige et manchon
WO2000072784A1 (fr) * 1999-06-01 2000-12-07 Apex Surgical, Llc Protheses articulaires pouvant etre implantees
US6306174B1 (en) * 1998-12-18 2001-10-23 Benoist Girard Sas Femoral component

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5002578A (en) * 1990-05-04 1991-03-26 Venus Corporation Modular hip stem prosthesis apparatus and method
EP1004283A2 (fr) * 1998-11-23 2000-05-31 Johnson & Johnson Professional, Inc. Prothèse modulaire à tige et manchon
US6306174B1 (en) * 1998-12-18 2001-10-23 Benoist Girard Sas Femoral component
WO2000072784A1 (fr) * 1999-06-01 2000-12-07 Apex Surgical, Llc Protheses articulaires pouvant etre implantees

Also Published As

Publication number Publication date
ITMI20110782A1 (it) 2012-11-10

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