FR2711750A1 - Device for immobilising a body in a bore - Google Patents
Device for immobilising a body in a bore Download PDFInfo
- Publication number
- FR2711750A1 FR2711750A1 FR9313216A FR9313216A FR2711750A1 FR 2711750 A1 FR2711750 A1 FR 2711750A1 FR 9313216 A FR9313216 A FR 9313216A FR 9313216 A FR9313216 A FR 9313216A FR 2711750 A1 FR2711750 A1 FR 2711750A1
- Authority
- FR
- France
- Prior art keywords
- bore
- rod
- introduction
- blocking
- recess
- 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.)
- Granted
Links
- 230000000903 blocking effect Effects 0.000 claims description 11
- 239000007943 implant Substances 0.000 claims description 10
- 210000003127 knee Anatomy 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 239000013013 elastic material Substances 0.000 claims description 3
- 230000005489 elastic deformation Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 230000008878 coupling Effects 0.000 description 8
- 238000010168 coupling process Methods 0.000 description 8
- 238000005859 coupling reaction Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 1
Classifications
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- 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
- A61F2/3836—Special connection between upper and lower leg, e.g. constrained
- A61F2/384—Special connection between upper and lower leg, e.g. constrained hinged, i.e. with transverse axle restricting the movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
- F16B21/10—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts
- F16B21/16—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft
- F16B21/18—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft with circlips or like resilient retaining devices, i.e. resilient in the plane of the ring or the like; Details
-
- 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
- A61F2002/30354—Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
-
- 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
- A61F2002/30362—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 with possibility of relative movement between the protrusion and the recess
- A61F2002/3037—Translation along the common longitudinal axis, e.g. piston
- A61F2002/30372—Translation along the common longitudinal axis, e.g. piston with additional means for limiting said translation
-
- 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
- A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
-
- 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
- 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
- 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
- A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Orthopedic Medicine & Surgery (AREA)
- General Engineering & Computer Science (AREA)
- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Biomedical Technology (AREA)
- Cardiology (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Transplantation (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physical Education & Sports Medicine (AREA)
- Mechanical Engineering (AREA)
- Prostheses (AREA)
Abstract
Description
Dispositif de blocage d'un cornu dans un alésage
L'invention se rattache au secteur technique des sytèmes d'accouplement.Device for blocking a retort in a bore
The invention relates to the technical sector of coupling systems.
Plus particulièrement, I'invention concerne l'accouplement entre un élément mâle du type arbre et un élément femeite du type alésage, avec capacité de désaccouplement. More particularly, the invention relates to the coupling between a male element of the shaft type and a female element of the bore type, with uncoupling capacity.
Pour certaines applications, il est nécessaire de pouvoir accoupler les éléments sous un faible effort de pression. Pat contre, à l'inverse, le désaccouplement doit être effectué avec le maximum d'efforts pour éviter tout désaccouplement intempestif. Ce peut être le cas pour certaines prothèses du genou, notamment les prothèses totales du genou du type intra-condylien?e, telle que définie dans la demande de brevet EP 92420487.8. For certain applications, it is necessary to be able to couple the elements under a low pressure force. Pat against, on the contrary, the uncoupling must be carried out with the maximum of efforts to avoid any untimely uncoupling. This may be the case for certain knee prostheses, in particular total knee prostheses of the intra-condylar type, as defined in patent application EP 92420487.8.
On rappelle que ce type de prothèse comprend Un élément fémoral en appui par des patins condyliens sur un plateau tibiai. L'élément fémoral reçoit un axe transversal d'articulation, monté à libre station par rapport à une tige cylindrique engagée à libre coulissement dans un fourreau que présente l'élément tibial. L'accouplement de élément fémoral et de l'élément tibial s'effectue donc au moyen de la tige engagée dans le fourreau. It will be recalled that this type of prosthesis comprises a femoral element supported by condylar pads on a tibiai plateau. The femoral element receives a transverse axis of articulation, mounted at free station with respect to a cylindrical rod engaged in free sliding in a sheath which presents the tibial element. The femoral element and the tibial element are therefore coupled by means of the rod engaged in the sheath.
Il est apparu nécessaire de limiter, voir d'interdire le mouvement de déplacement relatif de l'élément fémoral par rapport à l'élément tibial, tout entpermettant leur rotation. It appeared necessary to limit, even to prohibit the movement of relative displacement of the femoral element with respect to the tibial element, while allowing their rotation.
Pour réaliser cette fonction, on peut utiliser des organes mécaniques rapporté & telles que vis, coopérant avec des agencements complémentaires que présente la tige. Cette solution n'est cependant pas totalement satisfaisante, car après accouplement des deux élbments, il est nécessaire d'intervenir sur la vis, pour assurer le blocage en position. II en est de même lorsque l'on souhaite désaccoupler les deux éléments. To achieve this function, it is possible to use attached mechanical members such as screws, cooperating with complementary arrangements that the rod has. This solution is however not entirely satisfactory, because after coupling of the two elements, it is necessary to intervene on the screw, to ensure locking in position. It is the same when it is desired to decouple the two elements.
L'invention s'est fixée pour but de remédier à ces inconvénients, de manière simple, sûre, efficace et rationnelle. The object of the invention is to remedy these drawbacks in a simple, safe, effective and rational manner.
Le problème que se propose de résoudre l'invention est d'assurer l'accouplement et le désaccouplement d'un élément mâle par rapport à un élément femelle, sans être obligé d'intervenir sur des organes rapportés, en ayant pour objectif de pouvoir accoupler les deux éléments sous un faible effort de pression et de les désccoupler seulement sous un effort de traction important. The problem which the invention proposes to solve is to ensure the coupling and uncoupling of a male element with respect to a female element, without being obliged to intervene on attached members, with the aim of being able to couple the two elements under a low pressure force and uncoupling them only under a high tensile force.
Pour résoudre un tel problème, il a été conçu et mis au point un dispositif de blocage d'un corps dans un alésage selon lequel I alésage ou le corps présente au moins un moyen apte à coopérer en pression avec le corps, ledit moyen étant conformé pour être sollicité élastiquement en combinaison avec des agencements du corps et de raiôeae pour permettre:
- I'introduction du corps dans l'alésage selon une force d'intensité réduite et le blocage en position,
- le retrait du corps de l'alésage selon une force d'intensité supérieure à la précédente correspondant au désaccouplement.To solve such a problem, a device for blocking a body in a bore has been designed and developed, according to which the bore or the body has at least one means capable of cooperating in pressure with the body, said means being shaped to be stressed elastically in combination with body and raiôeae arrangements to allow:
- introducing the body into the bore at a reduced intensity force and locking it in position,
- the withdrawal of the body from the bore according to a force of intensity greater than the previous one corresponding to the uncoupling.
Pour résoudre le problème posé de permettre l'intfOuction du corps dans l'alésage selon une force d'intensité réduite, les agencements sont constitués par une portée conique formée en bout du corps et par un logement formé dans l'alésage apte à recevoir le ou les moyens selon une position déterminée par rapport à une partie du corps recevant le ou lesdits moyens en position de blocage. To resolve the problem posed of allowing the body to be fed into the bore according to a force of reduced intensity, the arrangements are constituted by a conical bearing formed at the end of the body and by a housing formed in the bore capable of receiving the or the means according to a determined position with respect to a part of the body receiving the said means or said in the blocking position.
La partie du corps recevant le ou les moyens en position de blocage, est constituée par un évidement dans lequel sont engagés par élasticité le ou les moyens, après introduction du corps dans l'alésage. The part of the body receiving the means or means in the blocking position, is constituted by a recess in which are engaged by elasticity the means or, after introduction of the body into the bore.
Pour résoudre le problème posé d'assurer le blocage en position, soit le moyen de blocage est réalisé dans une maiôre avec capacité de déformation élastique sous l'effet de l'introductlon du corps dans l'alésage, soit le moyen de blocage est réalisé dans une matière non élastique et est assujetti à des organes de mise en pression pour être escamoté sous l'effet de l'introduction du corps dans l'alésage. To solve the problem posed of ensuring the blocking in position, either the blocking means is produced in a house with capacity for elastic deformation under the effect of the introduction of the body into the bore, or the blocking means is produced in a non-elastic material and is subject to pressurizing members to be retracted under the effect of the introduction of the body into the bore.
Pour résoudre le problème posé de permettre le désaccouplement du corps de l'alésage, en position de ooopeation du moyen de blocage avec l'évidement, son axe est décalé par rapport au bord externe correspondant du corps. To resolve the problem posed of allowing the body of the bore to be uncoupled, in the position of ooopeation of the locking means with the recess, its axis is offset relative to the corresponding external edge of the body.
Avantageusement, le logement est constitué par une gorge circulaire dans laquelle est logé le moyen de blocage sous torme cl'un jonc élastique. En position de coopération du jonc avec l'évidement, son diamètre moyen est supérieur ou au moins égal au diamètre externe du corps. Advantageously, the housing is constituted by a circular groove in which is housed the means for locking under a torch with an elastic ring. In the position of cooperation of the rod with the recess, its mean diameter is greater than or at least equal to the external diameter of the body.
Le dispositf selon l'invention trouve une application particulièrement avantageuse, dans le cas d'une prothèse du genou, du type de celle comprenant un implant fémoral et un implant tibial L'implant fémoral présentant une tige montée à libre coulissement, dans un manchon vertical, solidaire de l'implant tibial, la tige constituant te corps, tandis que le manchon constitue l'alésage. The device according to the invention finds a particularly advantageous application, in the case of a knee prosthesis, of the type comprising that comprising a femoral implant and a tibial implant. The femoral implant having a rod mounted to slide freely, in a vertical sleeve , integral with the tibial implant, the rod constituting the body, while the sleeve constitutes the bore.
L'invention est exposée, ci-après plus en détail à raide des dessins annexés, dans lesquels:
La figure 1 est une vue à grande échelle et en coupe longitudinale du dispositif en position d'accouplement.The invention is set out below in more detail with the aid of the appended drawings, in which:
Figure 1 is an enlarged view in longitudinal section of the device in the coupling position.
La figure 2 est une vue en coupe transversale considérée selon la ligne 2.2 de la figure 1. Figure 2 is a cross-sectional view taken along line 2.2 of Figure 1.
La figure 3 est une vue correspondant à la Figure 1, en position d'engagement du corps dans l'alésage. Figure 3 is a view corresponding to Figure 1, in the position of engagement of the body in the bore.
La figure 4 est une vue correspondant à la figure len position de désaccouplement. Figure 4 is a view corresponding to Figure l in the uncoupling position.
La figure 5 est une vue montrant l'application du dispositif à une prothèse du genou. Figure 5 is a view showing the application of the device to a knee prosthesis.
On décrit le dispositif selon l'invention dans le cas d'une application à une prothèse du genou comprenant un implant fémoral (IF) présentant une tige cylindrique (1) engagée à libre coulissement dans l'alésage (2a) d'un fourreau (2) que présente un implant tibial (in). The device according to the invention is described in the case of an application to a knee prosthesis comprising a femoral implant (IF) having a cylindrical rod (1) engaged with free sliding in the bore (2a) of a sheath ( 2) that has a tibial implant (in).
II est rappelé que le dispositif s'applique d'une manière générale, à tout accouplement entre un élément mâle du type arbre, constitué dans les dessins annexés par la tige (1) et un élément femelle du type alésage, constitué dans les dessins annexés par le fourreau (2). It is recalled that the device applies generally, to any coupling between a male element of the shaft type, constituted in the drawings attached by the rod (1) and a female element of the bore type, constituted in the attached drawings by the sheath (2).
Comme le montre la figure 1, l'alésage (2a) présente au moins un moyen (3) apte à coopérer en pression, avec la tige (1). Ce moyen (3) est conformé pour être sollicité élastiquement en combinaison avec les agencements (1a) de la tige (1) et un agencement (2b) de l'alésage du fourreau (2). As shown in Figure 1, the bore (2a) has at least one means (3) capable of cooperating under pressure, with the rod (1). This means (3) is shaped to be resiliently stressed in combination with the arrangements (1a) of the rod (1) and an arrangement (2b) of the bore of the sleeve (2).
Dans l'exemple illustré, le moyen de blocage (3) est constitué par un jonc élastique logé dans une gorge circulaire constituant l'agencement (2b). Comme il sera indiqué dans la suite de la description, ce jonc (3) coopère en position d'accouplement de la tige (1) dans l'alésage (2a) du fourreau (2) avec un évidement (lob), sous forme d'une portée circulaire que présente ladite tige (1). L'extrémité libre de la tige (1) présente une portée tronconique qui constitue les agencements;(1a). In the example illustrated, the locking means (3) consists of an elastic ring housed in a circular groove constituting the arrangement (2b). As will be indicated in the following description, this rod (3) cooperates in the coupling position of the rod (1) in the bore (2a) of the sleeve (2) with a recess (lob), in the form of 'a circular bearing that said rod (1). The free end of the rod (1) has a frustoconical bearing which constitutes the arrangements; (1a).
Le jonc élastique (3) coopère en pression avec l'ensemble de la tige (1) en étant ainsi conformé pour être sollicité élastiquement en expansion à l'intérieur de la gorge (2b). Le jonc (3) exerce donc sur la tige (1), une force de pression constante (F). The elastic ring (3) cooperates under pressure with the assembly of the rod (1), thus being shaped to be elastically stressed in expansion inside the groove (2b). The rod (3) therefore exerts on the rod (1) a constant pressing force (F).
Bien évidemment, ce moyen de blocage sous norme d'un jonc élastique ne doit pas être considéré comme limitatif. Ce moyen (3) peut être exécuté dans une matière non élastique en étant assujetti à des organes de mise en pression, tels que ressorts, pour être escamoté sous l'effet de l'introduction de la tige (1) dans l'alésage (2a) du fourreau (2). De même, la tige (1) et l'alésage (2a) du fourreau (2) peuvent présenter toute section transversale polygonale. Obviously, this standard locking means of an elastic ring should not be considered as limiting. This means (3) can be executed in a non-elastic material by being subject to pressurizing members, such as springs, to be retracted under the effect of the introduction of the rod (1) into the bore ( 2a) of the sheath (2). Similarly, the rod (1) and the bore (2a) of the sleeve (2) may have any polygonal cross section.
Suivant une autre caractéristique importante de t'invention, lorsque le jonc élastique (3) coopère avec l'évidement circulaire (il), ce qui correspond à la position d'accouplement de la tige (1) l'axe vertical (XX) de la section transversale du jonc est décalée d'une distance (d) par rapport au bord externe correspondant de la tige (1). Autrement dit, le diamètre primitif (D) du jonc élastique (3) est très légèrement supérieur au diamètre externe de la tige (1). According to another important characteristic of the invention, when the elastic ring (3) cooperates with the circular recess (it), which corresponds to the coupling position of the rod (1) the vertical axis (XX) of the cross section of the rod is offset by a distance (d) relative to the corresponding external edge of the rod (1). In other words, the pitch diameter (D) of the elastic ring (3) is very slightly greater than the external diameter of the rod (1).
Il convient maintenant, d'analyser le fonctionnement du dispositif. It is now necessary to analyze the operation of the device.
Au moment de l'introduction de la tige (1) dans le fourreau (2), la portée tronconique (la) permet son introduction sous un faible effort de poussée en écartant le jonc (3) à l'intérieur de la gorge (2b). > jonc (3) toujours soumis à la force de pression (F) vient se positionner après descente de la tige (1) dans le fourreau (2), dans l'empreinte circulaire (1 b), correspondant à la position de verrouillage. At the time of the introduction of the rod (1) into the sheath (2), the frustoconical bearing (la) allows its introduction under a low thrust force by spreading the rod (3) inside the groove (2b ). > rod (3) always subjected to the pressure force (F) is positioned after the rod (1) descends in the sheath (2), in the circular cavity (1 b), corresponding to the locking position.
En fonction de la hauteur de l'évidement circulaire (1 b), la tige (1) a donc la possibilité d'un déplacement en hauteur limité à l'interieur du fourreau (2). Depending on the height of the circular recess (1b), the rod (1) therefore has the possibility of a limited displacement in height inside the sheath (2).
Comme indiqué précédemment, dans cette position de verrouillage, c'est-à-dire lorsque le jonc (3) coopère avec la portée circulaire (lb), apparait le décalage (d). Pour assurer le désaocouplement,
L'effort de traction est beaucoup plus important, étant donné que la partie de raccordement entre l'évidement circulaire (1 b) et le corps de J'tige doit vaincre la résistance résultant de la force de pression (F) du jonc élastique (3). Pour se dégager, la partie de raccordement (c) agit sur le jonc (3), à la façon d'une rampe compte-tenu du décalage (d).As indicated above, in this locking position, that is to say when the rod (3) cooperates with the circular bearing (lb), the offset (d) appears. To ensure uncoupling,
The tensile force is much greater, given that the connection part between the circular recess (1b) and the J'tige body must overcome the resistance resulting from the pressure force (F) of the elastic ring ( 3). To disengage, the connection part (c) acts on the rod (3), like a ramp taking into account the offset (d).
A noter que pour augmenter l'effort de traction, on peut, soit augmenter l'intensité de la force (F), soit diminuer la valeur du décalage (d), soit cumuler ces deux paramètres. Note that to increase the tensile force, one can either increase the intensity of the force (F), or decrease the value of the offset (d), or combine these two parameters.
Ces dispositions permettent donc:
- d'assurer l'introduction du corps (1) dans l'alésage (2) selon une force d'intensité réduite et d'assurer le blocage en position avec, si nécessaire, la possibilité de rotation et de déplacement limité en hauteur,
- d'assurer le retrait du corps de l'alésage selon une force d'intensité supérieure, mais nécessaire à assurer le désaccouplement. These provisions therefore allow:
- ensuring the introduction of the body (1) into the bore (2) according to a force of reduced intensity and ensuring the locking in position with, if necessary, the possibility of rotation and displacement limited in height,
- to ensure the withdrawal of the body from the bore according to a higher intensity force, but necessary to ensure uncoupling.
Comme indiqué, le dispositif selon l'invention trouve une application particulièrement avantageuse dans le cas d'une prothèse du genou intra-condylienne du type de celle définie dans la demande de brevet EP 92420487.8. As indicated, the device according to the invention finds a particularly advantageous application in the case of an intra-condylar knee prosthesis of the type of that defined in patent application EP 92420487.8.
Les avantages ressortent bien de la descr1ptlofl; The advantages are clear from the descr1ptlofl;
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9313216A FR2711750B1 (en) | 1993-10-28 | 1993-10-28 | Device for blocking a body in a bore. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9313216A FR2711750B1 (en) | 1993-10-28 | 1993-10-28 | Device for blocking a body in a bore. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2711750A1 true FR2711750A1 (en) | 1995-05-05 |
| FR2711750B1 FR2711750B1 (en) | 1995-12-01 |
Family
ID=9452571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR9313216A Expired - Fee Related FR2711750B1 (en) | 1993-10-28 | 1993-10-28 | Device for blocking a body in a bore. |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2711750B1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10024282A1 (en) * | 2000-05-17 | 2001-11-22 | Zahnradfabrik Friedrichshafen | Automatic gear has hydrodynamic converter or clutch, first gear-shaft, converter neck, sprung fastening, groove, step and housing |
| US8268006B2 (en) | 2001-01-29 | 2012-09-18 | Zimmer, Inc. | Constrained prosthetic knee with rotating bearing |
| USRE44476E1 (en) | 2001-01-29 | 2013-09-03 | Zimmer, Inc. | Constrained prosthetic knee with rotating bearing |
| US11480208B2 (en) * | 2016-11-30 | 2022-10-25 | Standard Lifters, Inc. | Collar and shaft assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2704681A (en) * | 1952-08-28 | 1955-03-22 | R fischer | |
| FR1135349A (en) * | 1954-07-09 | 1957-04-26 | Maschf Augsburg Nuernberg Ag | Safety device for parts assembled by fitting or fitting |
| FR2179471A5 (en) * | 1972-04-06 | 1973-11-16 | Benz Reinhard | |
| EP0498206A1 (en) * | 1991-01-22 | 1992-08-12 | Peter J. Balsells | Latching, holding and locking spring apparatus |
| US5161838A (en) * | 1991-11-19 | 1992-11-10 | The Highfield Mfg. Company | Locking assembly |
| EP0553585A2 (en) * | 1991-12-31 | 1993-08-04 | Cuilleron, Jean | Intracondylar total knee prosthesis |
-
1993
- 1993-10-28 FR FR9313216A patent/FR2711750B1/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2704681A (en) * | 1952-08-28 | 1955-03-22 | R fischer | |
| FR1135349A (en) * | 1954-07-09 | 1957-04-26 | Maschf Augsburg Nuernberg Ag | Safety device for parts assembled by fitting or fitting |
| FR2179471A5 (en) * | 1972-04-06 | 1973-11-16 | Benz Reinhard | |
| EP0498206A1 (en) * | 1991-01-22 | 1992-08-12 | Peter J. Balsells | Latching, holding and locking spring apparatus |
| US5161838A (en) * | 1991-11-19 | 1992-11-10 | The Highfield Mfg. Company | Locking assembly |
| EP0553585A2 (en) * | 1991-12-31 | 1993-08-04 | Cuilleron, Jean | Intracondylar total knee prosthesis |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10024282A1 (en) * | 2000-05-17 | 2001-11-22 | Zahnradfabrik Friedrichshafen | Automatic gear has hydrodynamic converter or clutch, first gear-shaft, converter neck, sprung fastening, groove, step and housing |
| US8268006B2 (en) | 2001-01-29 | 2012-09-18 | Zimmer, Inc. | Constrained prosthetic knee with rotating bearing |
| USRE44476E1 (en) | 2001-01-29 | 2013-09-03 | Zimmer, Inc. | Constrained prosthetic knee with rotating bearing |
| US8888857B2 (en) | 2001-01-29 | 2014-11-18 | Zimmer, Inc. | Constrained prosthetic knee with rotating bearing |
| US11480208B2 (en) * | 2016-11-30 | 2022-10-25 | Standard Lifters, Inc. | Collar and shaft assembly |
| US11506236B2 (en) * | 2016-11-30 | 2022-11-22 | Standard Lifters, Inc. | Collar and shaft assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2711750B1 (en) | 1995-12-01 |
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