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FR2704423A1 - Medullary stem for joint prosthesis and adapter mounted at the end thereof - Google Patents

Medullary stem for joint prosthesis and adapter mounted at the end thereof Download PDF

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Publication number
FR2704423A1
FR2704423A1 FR9305317A FR9305317A FR2704423A1 FR 2704423 A1 FR2704423 A1 FR 2704423A1 FR 9305317 A FR9305317 A FR 9305317A FR 9305317 A FR9305317 A FR 9305317A FR 2704423 A1 FR2704423 A1 FR 2704423A1
Authority
FR
France
Prior art keywords
rod
cavity
prosthesis
stud
joint prosthesis
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.)
Pending
Application number
FR9305317A
Other languages
French (fr)
Inventor
Buscayret Christian
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.)
MONTPELLIER CHIRURGIE
Original Assignee
MONTPELLIER CHIRURGIE
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 MONTPELLIER CHIRURGIE filed Critical MONTPELLIER CHIRURGIE
Priority to FR9305317A priority Critical patent/FR2704423A1/en
Publication of FR2704423A1 publication Critical patent/FR2704423A1/en
Pending 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
    • A61F2/3676—Distal or diaphyseal parts of shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8802—Equipment for handling bone cement or other fluid fillers
    • A61B17/8847—Equipment for handling bone cement or other fluid fillers for removing cement from a bone cavity
    • 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
    • A61F2/30721—Accessories
    • A61F2/30723—Plugs or restrictors for sealing a cement-receiving space
    • 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
    • A61F2/30721—Accessories
    • A61F2/30724—Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/16—Instruments for performing osteoclasis; Drills or chisels for bones; Trepans
    • 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
    • A61F2/46—Special tools for implanting artificial joints
    • A61F2/4603—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4614—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof of plugs for sealing a cement-receiving space
    • 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
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30016—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in hardness, e.g. Vickers, Shore, Brinell
    • 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
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
    • 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
    • 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
    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • A61F2002/30797—Blind bores, e.g. of circular cross-section internally-threaded
    • 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
    • A61F2002/30886—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 externally-threaded
    • 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
    • A61F2/46—Special tools for implanting artificial joints
    • A61F2/4603—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2002/4619—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof for extraction
    • 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
    • A61F2/46—Special tools for implanting artificial joints
    • A61F2002/4631—Special tools for implanting artificial joints the prosthesis being specially adapted for being cemented
    • 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
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • 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
    • A61F2250/0019—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 hardness, e.g. Vickers, Shore, Brinell

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Vascular Medicine (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Prostheses (AREA)
  • Surgical Instruments (AREA)

Abstract

According to the invention, the distal end (2a) of the stem (2) has a stud (3) on which the adapter (4) can be engaged and retained by virtue of a complementary cavity (5) which it comprises. The cavity (5) of the adapter (4) thus makes it possible to centre the reamer, making it possible to deepen the cavity made in the bone during a repeat prosthetic operation.

Description

TIGE NEDULLAIRE DE PROTHESE D'ARTICULATION
ET EMBOUT MONTE A L'EXTREXITE DE
CELLE-CI
La présente invention concerne une tige médullaire de prothèse d'articulation et un embout destiné à être monté à l'extrémité de celle-ci.NEDULAR JOINT PROSTHESIS ROD
AND MOUNT ENDED OUTSIDE OF
THIS
The present invention relates to a medullary rod for a joint prosthesis and a nozzle intended to be mounted at the end thereof.

I1 est fréquent d'équiper l'extrémité distale de la tige médullaire d'une prothèse d'articulation d'un embout en matière moins dure que celle de la tige. I1 is frequent to equip the distal end of the medullary rod with a joint prosthesis with a tip made of less hard material than that of the rod.

Cet embout facilite l'introduction de la prothèse dans le canal médullaire, en guidant l'extrémité distale. This tip facilitates the introduction of the prosthesis into the medullary canal, by guiding the distal end.

De plus, son contact avec la corticale est moins dur que celui qu'aurait directement avec celle-ci l'extrémité de la tige, et est donc moins douloureux pour le patient.In addition, its contact with the cortex is less hard than that which the end of the stem would have directly with it, and is therefore less painful for the patient.

Dans les prothèses existantes, ces embouts sont montés par vissage à l'extrémité des tiges médullaires et comprennent à cet effet, comme le montre la figure 1, un téton axial fileté tandis que lesdites extrémités distales des prothèses comprennent des alésages taraudés correspondants. In existing prostheses, these end pieces are mounted by screwing at the end of the medullary rods and for this purpose comprise, as shown in FIG. 1, a threaded axial stud while said distal ends of the prostheses comprise corresponding threaded bores.

En pratique, il est parfois nécessaire de reprendre une prothèse préalablement posée, c'est-à-dire de la retirer pour la remplacer par une autre plus adaptée ou plus perfectionnée. Cette reprise implique, après retrait de la prothèse, d'approfondir la cavité à l'aide d'un alésoir, en éliminant le ciment existant, pour aménager une nouvelle cavité de réception de la seconde prothèse. In practice, it is sometimes necessary to take back a prosthesis previously placed, that is to say to remove it to replace it with another more suitable or more perfected. This recovery involves, after removal of the prosthesis, to deepen the cavity using a reamer, removing the existing cement, to create a new cavity for receiving the second prosthesis.

Lors du retrait de la prothèse préalablement posée, il arrive fréquemment que l'embout reste prisonnier du ciment de scellage, le filetage de son téton étant amené à céder sous l'effort de traction exercée sur la prothèse pour l'extraire. When removing the previously placed prosthesis, it often happens that the tip remains trapped in the sealing cement, the thread of its nipple being caused to yield under the tensile force exerted on the prosthesis to extract it.

I1 est alors nécessaire de creuser l'embout à l'aide de l'alésoir pour atteindre le ciment formant le fond de la cavité. Ce travail est difficile du fait de la présence du téton axial saillant de l'embout, qui vient faire dévier l'extrémité de l'alésoir de l'axe du canal médullaire, cette extrémité venant s'engager entre ledit téton et la corticale et creuser en biais, en attaquant la corticale au lieu d'attaquer l'embout, comme cela est visible sur la figure 2. I1 is then necessary to dig the tip using the reamer to reach the cement forming the bottom of the cavity. This work is difficult because of the presence of the axial stud projecting from the endpiece, which deflects the end of the reamer from the axis of the medullary canal, this end coming to engage between said stud and the cortex and dig at an angle, attacking the cortex instead of attacking the tip, as can be seen in Figure 2.

I1 en résulte une détérioration de la corticale amenant à un affaiblissement de l'os, voire même, si le praticien ne s'aperçoit pas à temps de cette déviation, une possibilité de transpercement de la paroi de l'os. This results in a deterioration of the cortex leading to a weakening of the bone, or even, if the practitioner does not notice this deviation in time, a possibility of piercing the wall of the bone.

La présente invention vise à remédier à cet inconvénient. The present invention aims to remedy this drawback.

A cette fin, l'extrémité distale de la tige de la prothèse présente un téton sur lequel l'embout peut être engagé et être retenu grâce à une cavité complémentaire qu'il comprend. To this end, the distal end of the prosthesis stem has a stud on which the endpiece can be engaged and be retained by means of a complementary cavity which it includes.

Ainsi, lorsqu'il reste prisonnier du ciment de scellage, l'embout ne présente après retrait de la prothèse aucune partie saillante venant gêner le travail de l'alésoir. Thus, when it remains trapped in the sealing cement, the end piece does not present, after removal of the prosthesis, any projecting part which interferes with the work of the reamer.

Avantageusement, le téton et la cavité sont aménagés dans l'axe longitudinal de la partie distale de la tige et de l'embout. L'extrémité conique de l'alésoir peut dès lors venir se centrer dans cette cavité, ce qui permet d'assurer un parfait centrage axial de celui-ci en début d'alésage. Advantageously, the stud and the cavity are arranged in the longitudinal axis of the distal part of the rod and of the end piece. The conical end of the reamer can therefore come to center in this cavity, which ensures perfect axial centering thereof at the start of boring.

De préférence, le téton de la tige est fileté et la cavité de l'embout est constituée par un alésage taraudé, afin de permettre un assemblage de l'embout à la tige par vissage. Preferably, the pin of the rod is threaded and the cavity of the end piece is constituted by a tapped bore, in order to allow an assembly of the end piece to the rod by screwing.

De toute façon, l'invention sera bien comprise à l'aide de la description qui suit, en référence au dessin schématique annexé représentant, à titre d'exemple non limitatif, une forme de réalisation préférée de la tige médullaire de prothèse d'articulation et de l'embout monté à l'extrémité de celle-ci, qu'elle concerne.  In any case, the invention will be better understood with the aid of the description which follows, with reference to the appended schematic drawing representing, by way of nonlimiting example, a preferred embodiment of the medullary rod of articulation prosthesis and the end piece mounted at the end thereof, which it relates to.

La figure 3 est une vue de profil de la tige, représentée partiellement, et de l'embout, représenté en coupe axiale ; et
Les figures 4 et 5 sont des vues en coupe axiale de l'os et de l'embout qui y est retenu, dans deux phases différentes de l'opération de reprise d'une prothèse.Figure 3 is a side view of the rod, shown partially, and the tip, shown in axial section; and
Figures 4 and 5 are views in axial section of the bone and the endpiece retained therein, in two different phases of the prosthesis recovery operation.

La figure 3 représente la partie distale 2a de la prothèse 2, qui comprend un téton axial fileté 3 et l'embout 4 en matière moins dure qu'elle, qu'elle est destiné à recevoir. Cet embout présente un alésage axial taraudé 5 permettant son vissage sur ladite extrémité distale 2a. FIG. 3 represents the distal part 2a of the prosthesis 2, which comprises a threaded axial stud 3 and the end piece 4 made of material which is less hard than it is intended to receive. This nozzle has a threaded axial bore 5 allowing it to be screwed onto said distal end 2a.

Comme le montrent les figures 4 et 5 en comparaison de la figure 2, lorsqu'il reste prisonnier du ciment de scellage 6 délimitant le fond de la cavité 7 de l'os 8, l'embout 4 ne présente, après retrait de la prothèse, aucune partie saillante venant gêner le travail de l'alésoir 9, servant à approfondir la cavité 7. As shown in FIGS. 4 and 5 in comparison with FIG. 2, when it remains trapped in the sealing cement 6 delimiting the bottom of the cavity 7 of the bone 8, the tip 4 does not present, after removal of the prosthesis , no protruding part impeding the work of the reamer 9, serving to deepen the cavity 7.

Au contraire, l'extrémité conique de l'alésoir 9 peut venir se centrer dans l'alésage taraudé 5, ce qui permet d'assurer un parfait positionnement axial de l'alésoir 9 en début d'alésage. L'embout en polyéthylène 4 peut ainsi facilement être creusé pour permettre d'atteindre le ciment 6 et d'approfondir la cavité 7.  On the contrary, the conical end of the reamer 9 can be centered in the tapped bore 5, which ensures perfect axial positioning of the reamer 9 at the start of boring. The polyethylene end piece 4 can thus easily be hollowed out to allow the cement 6 to be reached and to deepen the cavity 7.

Claims (3)

REVENDICATIONS 1 - Tige médullaire de prothèse d'articulation et embout monté à l'extrémité de celle-ci, caractérisée en ce que l'extrémité distale (2a) de la tige (2) présente un téton (3) sur lequel l'embout (4) peut être engagé et être retenu grâce à une cavité complémentaire (5) qu'il comprend. 1 - Medullary joint prosthesis rod and end piece mounted at the end thereof, characterized in that the distal end (2a) of the rod (2) has a stud (3) on which the end piece ( 4) can be engaged and be retained thanks to a complementary cavity (5) which it includes. 2 - Tige et embout selon la revendication 1, caractérisés en ce que le téton (3) et la cavité (4) sont aménagés dans l'axe longitudinal de la partie distale (2a) de la tige (2) et de l'embout (4). 2 - Rod and endpiece according to claim 1, characterized in that the stud (3) and the cavity (4) are arranged in the longitudinal axis of the distal part (2a) of the rod (2) and the endpiece (4). 3 - Tige et embout selon la revendication 1 ou la revendication 2, caractérisés en ce que le téton (3) de la tige (2) est fileté et en ce que la cavité (5) de l'embout (4) est constituée par un alésage taraudé.  3 - Rod and endpiece according to claim 1 or claim 2, characterized in that the stud (3) of the rod (2) is threaded and in that the cavity (5) of the endpiece (4) is constituted by a tapped bore.
FR9305317A 1993-04-29 1993-04-29 Medullary stem for joint prosthesis and adapter mounted at the end thereof Pending FR2704423A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9305317A FR2704423A1 (en) 1993-04-29 1993-04-29 Medullary stem for joint prosthesis and adapter mounted at the end thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9305317A FR2704423A1 (en) 1993-04-29 1993-04-29 Medullary stem for joint prosthesis and adapter mounted at the end thereof

Publications (1)

Publication Number Publication Date
FR2704423A1 true FR2704423A1 (en) 1994-11-04

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Family Applications (1)

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FR9305317A Pending FR2704423A1 (en) 1993-04-29 1993-04-29 Medullary stem for joint prosthesis and adapter mounted at the end thereof

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Country Link
FR (1) FR2704423A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0962198A3 (en) * 1998-06-04 2001-09-12 Benoist Girard Sas Plugging and centralising device for locating the stem of a prosthesis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0962198A3 (en) * 1998-06-04 2001-09-12 Benoist Girard Sas Plugging and centralising device for locating the stem of a prosthesis

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