EP3349682A1 - Irrigation cannula, in particular for an endodontic irrigation device - Google Patents

Irrigation cannula, in particular for an endodontic irrigation device

Info

Publication number
EP3349682A1
EP3349682A1 EP15763608.5A EP15763608A EP3349682A1 EP 3349682 A1 EP3349682 A1 EP 3349682A1 EP 15763608 A EP15763608 A EP 15763608A EP 3349682 A1 EP3349682 A1 EP 3349682A1
Authority
EP
European Patent Office
Prior art keywords
irrigation
cannula
active part
central channel
cannula according
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.)
Withdrawn
Application number
EP15763608.5A
Other languages
German (de)
French (fr)
Inventor
Nicolas Gehrig
David Brendlen
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.)
Produits Dentaires SA
Original Assignee
Produits Dentaires SA
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 Produits Dentaires SA filed Critical Produits Dentaires SA
Publication of EP3349682A1 publication Critical patent/EP3349682A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/02—Rinsing or air-blowing devices, e.g. using fluid jets or comprising liquid medication
    • A61C17/024—Rinsing or air-blowing devices, e.g. using fluid jets or comprising liquid medication with constant liquid flow
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/02—Rinsing or air-blowing devices, e.g. using fluid jets or comprising liquid medication
    • A61C17/0208—Rinsing or air-blowing devices, e.g. using fluid jets or comprising liquid medication combined with means providing suction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/50—Implements for filling root canals; Methods or instruments for medication of tooth nerve channels
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/40—Implements for surgical treatment of the roots or nerves of the teeth; Nerve needles; Methods or instruments for medication of the roots
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M3/00—Medical syringes, e.g. enemata; Irrigators
    • A61M3/02—Enemata; Irrigators

Definitions

  • the present invention relates to an irrigation cannula intended in particular to equip an endodontic irrigation device or system for irrigation of the root canal teeth after shaping.
  • Irrigation is an integral step in dental root canal treatment procedures. During this stage, an irrigation solution is injected into the dental root canal after it has been shaped in order to eliminate waste and debris and also for the purpose of disinfection.
  • the commonly used irrigation solutions are sodium hypochlorite (disinfectant, antibacterial agent), EDTA (Ethylenediaminetetraacetic acid), hydrogen peroxide or chlorhexidine.
  • the irrigation solution is injected via a cylindrical or conical irrigation cannula whose end is connected to a device for delivering the solution.
  • the cannula is shaped to be inserted into the root canal without damage. Openings are made in the cannula to allow diffusion of the solution.
  • the cannula must also be flexible in order to follow the shape of the root canal which is curved in general.
  • the shaping of such cannulae is long and relatively expensive.
  • a final problem is to avoid any damage to the canal walls when inserting or removing the cannula.
  • the present invention aims to achieve an irrigation cannula for equipping an irrigation device of the dental root canal which is effective and whose manufacture is fast and inexpensive.
  • the present invention aims at providing an irrigation cannula which makes it possible to solve the following problems:
  • the present invention relates to an irrigation cannula according to claim 1, and to an irrigation system according to claim 9.
  • FIG 1 illustrates an irrigation cannula according to the invention.
  • FIG 2 is an enlargement of the tip of the irrigation cannula shown in Figure 1.
  • Figure 3 is a sectional view of the irrigation cannula of Figure 1 along its longitudinal axis A-A.
  • Figure 4 is an enlargement of the tip of the irrigation cannula shown in Figure 3.
  • Figure 5 illustrates a first variant of the irrigation cannula according to the invention.
  • Figures 6 and 7 are enlargements of the tip of the irrigation cannula according to the first variant illustrated in Figure 5.
  • FIG. 8 is a sectional view along the longitudinal axis A-A of the irrigation cannula according to the first variant illustrated in FIG.
  • Figure 9 is an enlargement of the tip of the irrigation cannula shown in Figure 8.
  • Figure 10 illustrates a second variant of the irrigation cannula according to the invention.
  • FIG. 11 is an enlargement of the tip of the irrigation cannula according to the second variant illustrated in FIG.
  • Figure 12 is a sectional view along the longitudinal axis A-A of the irrigation cannula according to the second variant illustrated in Figure 10.
  • Figure 13 is an enlargement of the tip of the irrigation cannula shown in Figure 12.
  • An irrigation cannula comprises an active part 1 extending between a first end 2 and a second end 3 called tip.
  • the active part 1 can be curved or straight, cylindrical or conical.
  • the active part 1 is preferably flexible and has even more privileged flexibility increasing from the first end 2 to the second end 3.
  • the active part 1 extends along a longitudinal axis AA and is conical, its diameter tapering from the first end 2 to the tip 3.
  • the irrigation cannula according to the invention is intended to be connected by its first end 2 to an irrigation device or system (not shown) which traditionally comprises a source of irrigation solution and means for its diffusion from the source to the cannula.
  • the first end 2 may have any suitable shape. It can in particular be a connector of Luer type (Luer-lock connector).
  • the irrigation device may for example be constituted by a manually activated syringe or a pressure container such as a spray for diffusing an irrigation solution with a constant flow rate.
  • the irrigation cannula comprises a central channel 4 extending in the active part 1 between the first end 2 and the tip 3.
  • the central channel 4 is open at the first end 2 to communicate with the device irrigation system to which the cannula is connected and thus receive the irrigation solution.
  • the central channel 4 is preferably closed at the tip 3 and does not cross this point 3, to prevent the irrigation solution is diffused directly towards the apex of the root canal.
  • the tip 3 preferably has a rounded shape to reduce the risk of perforation or damage of the walls of the channel during the insertion of the irrigation cannula.
  • the irrigation cannula comprises at least one but preferably two, three or four openings 5 arranged radially on the active part 1 near the tip 3 and communicating with the central channel 4 for the diffusion of the irrigation solution.
  • the openings 5 are elongate and extend parallel to the longitudinal axis A-A of the cannula.
  • the openings 5 are distributed so as to be diametrically opposed in pairs.
  • the openings 5 have a bevelled shape and comprise an inclined plane 6 formed in the wall of the active part 1 of the cannula.
  • the inclined plane 6 of an opening 5 extends from a breakthrough 7 in the central channel 4 to the outer surface of the active part 1 towards the first end 2 of the cannula.
  • This beveled shape of the openings 5 is intended to direct the flow of the irrigation solution to the first end 2 of the active part 1, that is to say towards the top of the root canal and therefore the opposite of the apex when the cannula and its active part (1) is inserted into the channel. Indeed, with bevelled openings 5, the diffusion angle of the irrigation solution at the outlet of these openings 5 is reduced towards the tip 3 and the apex of the channel and is essentially directed towards the first end 2 of the cannula.
  • the irrigation cannula according to the invention is dimensioned to be inserted, tip 3 forward, in a root canal previously shaped, without damage, while allowing the injection of irrigation solution in said channel.
  • the openings 5 are dimensioned to ensure optimal diffusion of the irrigation solution.
  • the irrigation cannula is obtained by thermoplastic micro-injection.
  • a mold of the cannula is made, reproducing all the elements of the cannula and in particular the central channel 4, the first end 2, the tip 3 and the openings 5.
  • a suitable plastic material such as PE or PP plastics is then injected in said mold according to the principles of thermoplastic micro-injection.
  • the plastic material used is a plastic with high fluidity to ensure adequate filling of the mold in view of the reduced size thereof, the openings 5 and the central channel 4 in particular.
  • the irrigation cannula thus obtained is directly ready for use without having to resort to another machining step and offers a very smooth surface condition limiting damage to the walls of the canal.
  • the use of plastic materials guarantees the flexibility of the cannula while limiting production costs.
  • thermoplastic micro-injection thus makes it possible to increase the production capacities and to reduce the costs while ensuring that the irrigation cannula obtained has all the required properties: flexibility, size, non-damaging surface, efficiency.
  • the irrigation cannula furthermore has a flexible collar 8 near its tip 3.
  • this flexible flange 8 extends radially relative to the active portion 1 and its longitudinal axis AA and is located between the tip 3 and the openings 5.
  • This flexible flange 8 is arranged to deform when it comes into contact with the walls of said channel when inserting or removing the cannula and so do not damage the canal.
  • the flexible collar 8 has the dual function of preventing the cannula from being inserted beyond the apex into the canal and acting as a barrier or shutter to prevent the irrigation solution from passing through the canal. apex and reach the periapical tissue.
  • the flexible collar 8 forms a concave element (deformed in the direction of the first end 2) capable of partially blocking and redirecting the flow of irrigation solution towards the first end 2 of the cannula and up the root canal.
  • the irrigation cannula according to this variant provided with a flexible collar 8 is also obtained by thermoplastic micro-injection molding with the appropriate mold, the use of plastic materials ensuring the flexibility of said collar.
  • the irrigation cannula further comprises a projection 9 located in the central channel 4 of the active part 1 at the closed end of said channel near the tip 3
  • This projection 9 extends parallel to the longitudinal axis AA of the active part towards the first end 2.
  • This projection 9 may be cylindrical as illustrated or conical.
  • the projection 9 is arranged in the central channel 4 and dimensioned to create a phenomenon of turbulence in the irrigation solution when it passes through the central channel 4 so that the flow of irrigation solution which is first directed to the tip 3 of the active part 1 under the action of the irrigation device, is redirected in contact with the projection 9 to the first end 2 of the cannula.
  • the presence of the projection 9 further limits the portion of the flow of irrigating irrigation solution. openings 5 towards the tip 3 of the cannula and therefore the apex of the channel.
  • the irrigation cannula according to this second variant is also obtained by a thermoplastic micro-injection process, the corresponding mold having the characteristics necessary for producing the projection 9.
  • the irrigation cannula according to the invention is effective and safe since it ensures a good diffusion of the irrigation solution to ensure proper cleaning of the canal while limiting the risk that the solution protrudes beyond the apex and reaches the periapical tissue due to the shape of the openings and / or the collar and / or the projection inside the central channel.
  • plastic materials it is very easy to adapt the flexibility of the cannula and obtain very smooth surface conditions limiting the damage that could be caused to the channel.
  • the thermoplastic micro-injection process also makes it possible to reduce the costs and the production time since no other machining is required following the demoulding of the cannula.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

The present invention relates to an irrigation cannula comprising an active part (1) extending between a first end, which is intended to be connected to an irrigation device, and a second end (3), which is closed, a central channel (4) which extends within the active part (1) and is open at the first end (2), and at least one opening (5) arranged radially on the active part (1) near the second end (3) and communicating with the central channel (4) for distribution of an irrigation solution. The cannula is obtained in one piece by a thermoplastic micro-injection moulding method.

Description

Canule d'irrigation notamment pour dispositif d'irrigation endodontique  Irrigation cannula especially for endodontic irrigation device
La présente invention a pour objet une canule d'irrigation destinée notamment à équiper un dispositif ou système d'irrigation endodontique pour l'irrigation des canaux radiculaires dentaires après leur mise en forme. The present invention relates to an irrigation cannula intended in particular to equip an endodontic irrigation device or system for irrigation of the root canal teeth after shaping.
L'irrigation est une étape à part entière dans les procédures de traitement des canaux radiculaires dentaires. Durant cette étape, une solution d'irrigation est injectée dans le canal radiculaire dentaire après sa mise en forme dans le but d'éliminer les déchets et les débris et également dans un but de désinfection. Les solutions d'irrigation généralement utilisées sont l'hypochlorite de sodium (désinfectant, agent antibactérien), l'EDTA (Ethylenediaminetetraacetic acid), le peroxyde d'hydrogène ou la Chlorhexidine.  Irrigation is an integral step in dental root canal treatment procedures. During this stage, an irrigation solution is injected into the dental root canal after it has been shaped in order to eliminate waste and debris and also for the purpose of disinfection. The commonly used irrigation solutions are sodium hypochlorite (disinfectant, antibacterial agent), EDTA (Ethylenediaminetetraacetic acid), hydrogen peroxide or chlorhexidine.
De manière générale, la solution d'irrigation est injectée via une canule d'irrigation cylindrique ou conique dont une extrémité est connectée à un dispositif permettant de délivrer la solution. La canule est conformée pour pouvoir être insérée dans le canal radiculaire sans dommage. Des ouvertures sont pratiquées dans la canule pour permettre la diffusion de la solution.  In general, the irrigation solution is injected via a cylindrical or conical irrigation cannula whose end is connected to a device for delivering the solution. The cannula is shaped to be inserted into the root canal without damage. Openings are made in the cannula to allow diffusion of the solution.
Pour être efficace, la canule doit être en outre flexible afin de pouvoir suivre la forme du canal radiculaire qui est courbe en général. Pour ce faire, il est connu de réaliser des canules en acier inoxydable ou en alliage de nickel-titane qui est un matériau très utilisé dans le domaine dentaire notamment pour sa flexibilité (voir par exemple US 2003/0013064). Cependant, la mise en forme de telles canules est longue et relativement coûteuse.  To be effective, the cannula must also be flexible in order to follow the shape of the root canal which is curved in general. To do this, it is known to make cannulas stainless steel or nickel-titanium alloy which is a material widely used in the dental field, in particular for its flexibility (see for example US 2003/0013064). However, the shaping of such cannulae is long and relatively expensive.
Un autre problème lié à l'irrigation est la nécessité d'assurer une bonne irrigation et un bon nettoyage du canal tout en évitant que la solution d'irrigation ne dépasse l'apex du canal et n'atteigne le tissu péri-apical, ce phénomène dit d'extrusion peut créer des œdèmes ou des hématomes. Pour ce faire, l'extrémité de la canule destinée à être insérée dans le canal radiculaire est généralement fermée ou borgne et les ouvertures sont disposées radialement autour de la canule à proximité de cette extrémité fermée. Another problem related to irrigation is the need to ensure good irrigation and cleaning of the canal while avoiding the irrigation solution protruding beyond the apex of the canal and reaching the periapical tissue. extrusion phenomenon can create edema or hematoma. To do this, the end of the cannula intended to be inserted into the root canal is generally closed or blind and the openings are arranged radially around the cannula near this closed end.
Un dernier problème consiste à éviter tout dommage sur les parois du canal lors de l'insertion ou du retrait de la canule.  A final problem is to avoid any damage to the canal walls when inserting or removing the cannula.
La présente invention a pour but de réaliser une canule d'irrigation destinée à équiper un dispositif d'irrigation du canal radiculaire dentaire qui soit efficace et dont la fabrication soit rapide et peu coûteuse. En particulier, la présente invention vise à fournir une canule d'irrigation qui permette de résoudre les problèmes suivants :  The present invention aims to achieve an irrigation cannula for equipping an irrigation device of the dental root canal which is effective and whose manufacture is fast and inexpensive. In particular, the present invention aims at providing an irrigation cannula which makes it possible to solve the following problems:
• assurer une bonne diffusion de la solution d'irrigation pour garantir un bon nettoyage du canal,  • ensure a good diffusion of the irrigation solution to ensure a good cleaning of the canal,
• limiter le risque que la solution dépasse l'apex et atteigne le tissu péri- apical,  • limit the risk of the solution protruding beyond the apex and reaching the periapical tissue,
• limiter le risque de dommages causés aux parois du canal et à son apex lors de l'insertion de la canule,  • limit the risk of damage to the walls of the canal and its apex during insertion of the cannula,
• offrir une flexibilité suffisante pour s'adapter à la forme du canal, • offer sufficient flexibility to adapt to the shape of the channel,
• limiter les coûts de fabrication. • limit manufacturing costs.
La présente invention a pour objet une canule d'irrigation selon la revendication 1 , ainsi qu'un système d'irrigation selon la revendication 9. The present invention relates to an irrigation cannula according to claim 1, and to an irrigation system according to claim 9.
Les dessins annexés illustrent schématiquement et à titre d'exemple plusieurs formes d'exécution d'une canule d'irrigation selon l'invention. The accompanying drawings illustrate schematically and by way of example several embodiments of an irrigation cannula according to the invention.
La figure 1 illustre une canule d'irrigation selon l'invention.  Figure 1 illustrates an irrigation cannula according to the invention.
La figure 2 est un agrandissement de la pointe de la canule d'irrigation illustrée à la figure 1 .  Figure 2 is an enlargement of the tip of the irrigation cannula shown in Figure 1.
La figure 3 est une vue en coupe de la canule d'irrigation de la figure 1 selon son axe longitudinal A-A.  Figure 3 is a sectional view of the irrigation cannula of Figure 1 along its longitudinal axis A-A.
La figure 4 est un agrandissement de la pointe de la canule d'irrigation illustrée à la figure 3. La figure 5 illustre une première variante de la canule d'irrigation selon l'invention. Figure 4 is an enlargement of the tip of the irrigation cannula shown in Figure 3. Figure 5 illustrates a first variant of the irrigation cannula according to the invention.
Les figures 6 et 7 sont des agrandissements de la pointe de la canule d'irrigation selon la première variante illustrée à la figure 5.  Figures 6 and 7 are enlargements of the tip of the irrigation cannula according to the first variant illustrated in Figure 5.
La figure 8 est une vue en coupe selon l'axe longitudinal A-A de la canule d'irrigation selon la première variante illustrée à la figure 5.  FIG. 8 is a sectional view along the longitudinal axis A-A of the irrigation cannula according to the first variant illustrated in FIG.
La figure 9 est un agrandissement de la pointe de la canule d'irrigation illustrée à la figure 8.  Figure 9 is an enlargement of the tip of the irrigation cannula shown in Figure 8.
La figure 10 illustre une seconde variante de la canule d'irrigation selon l'invention.  Figure 10 illustrates a second variant of the irrigation cannula according to the invention.
La figure 1 1 est un agrandissement de la pointe de la canule d'irrigation selon la seconde variante illustrée à la figure 10.  FIG. 11 is an enlargement of the tip of the irrigation cannula according to the second variant illustrated in FIG.
La figure 12 est une vue en coupe selon l'axe longitudinal A-A de la canule d'irrigation selon la seconde variante illustrée à la figure 10.  Figure 12 is a sectional view along the longitudinal axis A-A of the irrigation cannula according to the second variant illustrated in Figure 10.
La figure 13 est un agrandissement de la pointe de la canule d'irrigation illustrée à la figure 12.  Figure 13 is an enlargement of the tip of the irrigation cannula shown in Figure 12.
Une canule d'irrigation selon l'invention comprend une partie active 1 s'étendant entre une première extrémité 2 et une seconde extrémité 3 appelée pointe. La partie active 1 peut être courbée ou droite, cylindrique ou conique. La partie active 1 est de préférence flexible et présente de manière encore plus privilégiée une flexibilité croissante de la première extrémité 2 à la seconde extrémité 3. Dans la forme d'exécution illustrée aux figures, la partie active 1 s'étend le long d'un axe longitudinal A-A et est conique, son diamètre s'amincissant de la première extrémité 2 vers la pointe 3.  An irrigation cannula according to the invention comprises an active part 1 extending between a first end 2 and a second end 3 called tip. The active part 1 can be curved or straight, cylindrical or conical. The active part 1 is preferably flexible and has even more privileged flexibility increasing from the first end 2 to the second end 3. In the embodiment illustrated in the figures, the active part 1 extends along a longitudinal axis AA and is conical, its diameter tapering from the first end 2 to the tip 3.
La canule d'irrigation selon l'invention est destinée à être connectée par sa première extrémité 2 à un dispositif ou système d'irrigation (non illustré) qui comprend traditionnellement une source de solution d'irrigation et des moyens pour sa diffusion de la source à la canule. Pour ce faire, la première extrémité 2 peut avoir toute forme appropriée. Il peut notamment s'agir d'un connecteur de type Luer (Luer-lock connector). Le dispositif d'irrigation peut par exemple être constitué d'une seringue à activation manuelle ou d'un container sous pression comme un spray permettant de diffuser une solution d'irrigation avec un débit constant. The irrigation cannula according to the invention is intended to be connected by its first end 2 to an irrigation device or system (not shown) which traditionally comprises a source of irrigation solution and means for its diffusion from the source to the cannula. To do this, the first end 2 may have any suitable shape. It can in particular be a connector of Luer type (Luer-lock connector). The irrigation device may for example be constituted by a manually activated syringe or a pressure container such as a spray for diffusing an irrigation solution with a constant flow rate.
Pour permettre l'irrigation, la canule d'irrigation comprend un canal central 4 s'étendant dans la partie active 1 entre la première extrémité 2 et la pointe 3. Le canal central 4 est ouvert à la première extrémité 2 pour communiquer avec le dispositif d'irrigation auquel est connectée la canule et ainsi recevoir la solution d'irrigation. Le canal central 4 est de préférence fermé à la pointe 3 et ne traverse pas cette pointe 3, pour éviter que la solution d'irrigation ne soit diffusée directement en direction de l'apex du canal radiculaire.  To allow irrigation, the irrigation cannula comprises a central channel 4 extending in the active part 1 between the first end 2 and the tip 3. The central channel 4 is open at the first end 2 to communicate with the device irrigation system to which the cannula is connected and thus receive the irrigation solution. The central channel 4 is preferably closed at the tip 3 and does not cross this point 3, to prevent the irrigation solution is diffused directly towards the apex of the root canal.
En plus d'être fermée, la pointe 3 présente de préférence une forme arrondie pour réduire les risques de perforation ou de dommages des parois du canal lors de l'insertion de la canule d'irrigation.  In addition to being closed, the tip 3 preferably has a rounded shape to reduce the risk of perforation or damage of the walls of the channel during the insertion of the irrigation cannula.
Finalement, la canule d'irrigation selon l'invention comprend au moins une mais de préférence deux, trois ou quatre ouvertures 5 agencées radialement sur la partie active 1 à proximité de la pointe 3 et communiquant avec le canal central 4 pour la diffusion de la solution d'irrigation. De préférence et comme illustré sur les figures, les ouvertures 5 sont allongées et s'étendent parallèlement à l'axe longitudinal A-A de la canule. De préférence également, les ouvertures 5 sont réparties de manière à être diamétralement opposées deux à deux.  Finally, the irrigation cannula according to the invention comprises at least one but preferably two, three or four openings 5 arranged radially on the active part 1 near the tip 3 and communicating with the central channel 4 for the diffusion of the irrigation solution. Preferably and as illustrated in the figures, the openings 5 are elongate and extend parallel to the longitudinal axis A-A of the cannula. Also preferably, the openings 5 are distributed so as to be diametrically opposed in pairs.
De manière privilégiée et comme illustré sur les figures 2, 4, 6, 7, 9, 1 1 et 13, les ouvertures 5 présentent une forme biseautée et comprennent un plan incliné 6 réalisé dans la paroi de la partie active 1 de la canule. Le plan incliné 6 d'une ouverture 5 s'étend depuis une percée 7 dans le canal central 4 jusqu'à la surface extérieure de la partie active 1 en direction de la première extrémité 2 de la canule. Cette forme biseautée des ouvertures 5 a pour but de diriger le flux de la solution d'irrigation vers la première extrémité 2 de la partie active 1 , c'est-à-dire vers le haut du canal radiculaire et donc à l'opposé de l'apex lorsque la canule et sa partie active (1 ) sont insérées dans le canal. En effet, avec des ouvertures 5 biseautées, l'angle de diffusion de la solution d'irrigation en sortie de ces ouvertures 5 est réduit en direction de la pointe 3 et de l'apex du canal et est essentiellement dirigé vers la première extrémité 2 de la canule. In a preferred manner and as illustrated in Figures 2, 4, 6, 7, 9, 1 1 and 13, the openings 5 have a bevelled shape and comprise an inclined plane 6 formed in the wall of the active part 1 of the cannula. The inclined plane 6 of an opening 5 extends from a breakthrough 7 in the central channel 4 to the outer surface of the active part 1 towards the first end 2 of the cannula. This beveled shape of the openings 5 is intended to direct the flow of the irrigation solution to the first end 2 of the active part 1, that is to say towards the top of the root canal and therefore the opposite of the apex when the cannula and its active part (1) is inserted into the channel. Indeed, with bevelled openings 5, the diffusion angle of the irrigation solution at the outlet of these openings 5 is reduced towards the tip 3 and the apex of the channel and is essentially directed towards the first end 2 of the cannula.
De manière évidente, la canule d'irrigation selon l'invention est dimensionnée pour pouvoir être insérée, pointe 3 en avant, dans un canal radiculaire préalablement mise en forme, sans dommage, tout en permettant l'injection de solution d'irrigation dans ledit canal. De même les ouvertures 5 sont dimensionnées pour garantir une diffusion optimale de la solution d'irrigation.  Obviously, the irrigation cannula according to the invention is dimensioned to be inserted, tip 3 forward, in a root canal previously shaped, without damage, while allowing the injection of irrigation solution in said channel. Similarly the openings 5 are dimensioned to ensure optimal diffusion of the irrigation solution.
Selon une particularité de l'invention, la canule d'irrigation est obtenue par micro-injection thermoplastique. Un moule de la canule est réalisé, reproduisant tous les éléments de la canule et notamment le canal central 4, la première extrémité 2, la pointe 3 et les ouvertures 5. Un matériau plastique approprié comme par exemple les plastiques PE ou PP est ensuite injecté dans ledit moule selon les principes de la micro-injection thermoplastique. De préférence, le matériau plastique utilisé est un plastique à haute fluidité pour assurer un remplissage adéquat du moule au vu de la taille réduite de celui-ci, des ouvertures 5 et du canal central 4 notamment.  According to a feature of the invention, the irrigation cannula is obtained by thermoplastic micro-injection. A mold of the cannula is made, reproducing all the elements of the cannula and in particular the central channel 4, the first end 2, the tip 3 and the openings 5. A suitable plastic material such as PE or PP plastics is then injected in said mold according to the principles of thermoplastic micro-injection. Preferably, the plastic material used is a plastic with high fluidity to ensure adequate filling of the mold in view of the reduced size thereof, the openings 5 and the central channel 4 in particular.
La canule d'irrigation ainsi obtenue est directement prête à l'emploi sans qu'il faille recourir à une autre étape d'usinage et offre un état de surface très lisse limitant les dommages aux parois du canal. De plus, le recours à des matériaux plastiques garantit la flexibilité de la canule tout en limitant les coûts de production.  The irrigation cannula thus obtained is directly ready for use without having to resort to another machining step and offers a very smooth surface condition limiting damage to the walls of the canal. In addition, the use of plastic materials guarantees the flexibility of the cannula while limiting production costs.
Ce mode de production par micro-injection thermoplastique permet donc d'augmenter les capacités de production et de réduire les coûts tout en garantissant que la canule d'irrigation obtenue présente toutes les propriétés requises : flexibilité, taille, surface non dommageable, efficacité.  This method of production by thermoplastic micro-injection thus makes it possible to increase the production capacities and to reduce the costs while ensuring that the irrigation cannula obtained has all the required properties: flexibility, size, non-damaging surface, efficiency.
Dans une première variante de l'invention illustrée en détail aux figures 5 à 9, la canule d'irrigation présente en outre une collerette flexible 8 à proximité de sa pointe 3. Au repos, hors du canal radiculaire, comme illustrée aux figures, cette collerette flexible 8 s'étend radialement par rapport à la partie active 1 et son axe longitudinal A-A et est située entre la pointe 3 et les ouvertures 5. Cette collerette flexible 8 est agencée pour se déformer lorsqu'elle vient en contact des parois dudit canal lors de l'insertion ou du retrait de la canule et ainsi ne pas endommager le canal. La collerette flexible 8 a pour double fonction d'empêcher la canule d'être insérée au-delà de l'apex dans le canal et de faire office de barrière ou d'obturateur afin d'empêcher la solution d'irrigation de passer l'apex et d'atteindre le tissu péri-apical. En effet, en se déformant durant l'insertion de la canule dans le canal, la collerette flexible 8 forme un élément concave (déformée en direction de la première extrémité 2) capable de bloquer en partie et de rediriger le flux de solution d'irrigation en direction de la première extrémité 2 de la canule et vers le haut du canal radiculaire. In a first variant of the invention illustrated in detail in FIGS. 5 to 9, the irrigation cannula furthermore has a flexible collar 8 near its tip 3. At rest, outside the root canal, as illustrated in the figures, this flexible flange 8 extends radially relative to the active portion 1 and its longitudinal axis AA and is located between the tip 3 and the openings 5. This flexible flange 8 is arranged to deform when it comes into contact with the walls of said channel when inserting or removing the cannula and so do not damage the canal. The flexible collar 8 has the dual function of preventing the cannula from being inserted beyond the apex into the canal and acting as a barrier or shutter to prevent the irrigation solution from passing through the canal. apex and reach the periapical tissue. Indeed, by deforming during the insertion of the cannula into the channel, the flexible collar 8 forms a concave element (deformed in the direction of the first end 2) capable of partially blocking and redirecting the flow of irrigation solution towards the first end 2 of the cannula and up the root canal.
La canule d'irrigation selon cette variante munie d'une collerette flexible 8 est également obtenue par moulage par micro-injection thermoplastique avec le moule adéquat, l'utilisation de matériaux plastique assurant la flexibilité de ladite collerette.  The irrigation cannula according to this variant provided with a flexible collar 8 is also obtained by thermoplastic micro-injection molding with the appropriate mold, the use of plastic materials ensuring the flexibility of said collar.
Selon une deuxième variante de l'invention illustrée en détail aux figures 10 à 13, la canule d'irrigation comprend encore une saillie 9 située dans le canal central 4 de la partie active 1 à l'extrémité fermée dudit canal proche de la pointe 3. Cette saillie 9 s'étend parallèlement à l'axe longitudinal A-A de la partie active en direction de la première extrémité 2. Cette saillie 9 peut être cylindrique comme illustrée ou encore conique.  According to a second variant of the invention illustrated in detail in FIGS. 10 to 13, the irrigation cannula further comprises a projection 9 located in the central channel 4 of the active part 1 at the closed end of said channel near the tip 3 This projection 9 extends parallel to the longitudinal axis AA of the active part towards the first end 2. This projection 9 may be cylindrical as illustrated or conical.
La saillie 9 est agencée dans le canal central 4 et dimensionnée pour créer un phénomène de turbulence dans la solution d'irrigation lorsque celle-ci traverse le canal central 4 de sorte que le flux de solution d'irrigation qui est d'abord dirigé vers la pointe 3 de la partie active 1 sous l'action du dispositif d'irrigation, est redirigé au contact de la saillie 9 vers la première extrémité 2 de la canule. Ainsi, une partie au moins du flux de solution d'irrigation est diffusée par les ouvertures 5 alors que ledit flux est dirigé vers la première extrémité 2 de la canule ce qui implique que ledit flux s'échappe des ouvertures 5 en direction de la première extrémité et non pas en direction de la pointe 3. Par conséquent, la présence de la saillie 9 limite encore la portion du flux de solution d'irrigation qui s'écoule des ouvertures 5 en direction de la pointe 3 de la canule et donc de l'apex du canal. The projection 9 is arranged in the central channel 4 and dimensioned to create a phenomenon of turbulence in the irrigation solution when it passes through the central channel 4 so that the flow of irrigation solution which is first directed to the tip 3 of the active part 1 under the action of the irrigation device, is redirected in contact with the projection 9 to the first end 2 of the cannula. Thus, at least a portion of the flow of irrigation solution is diffused through the openings 5 while said flow is directed towards the first end 2 of the cannula which implies that said flow escapes from the apertures 5 towards the first end and not toward the tip 3. Consequently, the presence of the projection 9 further limits the portion of the flow of irrigating irrigation solution. openings 5 towards the tip 3 of the cannula and therefore the apex of the channel.
La canule d'irrigation selon cette seconde variante est également obtenue par un procédé de micro-injection thermoplastique, le moule correspondant comportant les caractéristiques nécessaires à la réalisation de la saillie 9.  The irrigation cannula according to this second variant is also obtained by a thermoplastic micro-injection process, the corresponding mold having the characteristics necessary for producing the projection 9.
Bien entendu, il est possible de combiner les variantes décrites ci-dessus pour obtenir une canule d'irrigation munie d'une collerette flexible 8 et d'une saillie 9, cette combinaison présentant tous les avantages de ces variantes.  Of course, it is possible to combine the variants described above to obtain an irrigation cannula provided with a flexible collar 8 and a projection 9, this combination having all the advantages of these variants.
La canule d'irrigation selon l'invention est efficace et sûre puisqu'elle permet d'assurer une bonne diffusion de la solution d'irrigation pour garantir un bon nettoyage du canal tout en limitant le risque que la solution dépasse l'apex et atteigne le tissu péri-apical grâce à la forme des ouvertures et/ou à la collerette et/ou à la saillie à l'intérieur du canal central. De plus, en utilisant des matériaux plastiques, il est très aisé d'adapter la flexibilité de la canule et d'obtenir des états de surface très lisses limitant les dommages qui pourrait être causés au canal. Le procédé de micro-injection thermoplastique permet également de diminuer les coûts et le temps de production puisqu'aucun autre usinage n'est requis suite au démoulage de la canule.  The irrigation cannula according to the invention is effective and safe since it ensures a good diffusion of the irrigation solution to ensure proper cleaning of the canal while limiting the risk that the solution protrudes beyond the apex and reaches the periapical tissue due to the shape of the openings and / or the collar and / or the projection inside the central channel. In addition, by using plastic materials, it is very easy to adapt the flexibility of the cannula and obtain very smooth surface conditions limiting the damage that could be caused to the channel. The thermoplastic micro-injection process also makes it possible to reduce the costs and the production time since no other machining is required following the demoulding of the cannula.

Claims

Revendications claims
1 . Canule d'irrigation comprenant une partie active (1 ) s'étendant entre une première extrémité destinée à être connectée à un dispositif d'irrigation et une seconde extrémité (3) fermée, un canal central (4) s'étendant dans la partie active (1 ) et ouvert à la première extrémité (2), et au moins une ouverture (5) agencée radialement sur la partie active (1 ) à proximité de la seconde extrémité (1 ) et communiquant avec le canal central (4) pour la diffusion d'une solution d'irrigation, caractérisée par le fait que la canule est obtenue en une pièce par un procédé de moulage par micro-injection thermoplastique. 1. Irrigation cannula comprising an active part (1) extending between a first end intended to be connected to an irrigation device and a closed second end (3), a central channel (4) extending into the active part (1) and open at the first end (2), and at least one opening (5) arranged radially on the active part (1) near the second end (1) and communicating with the central channel (4) for the diffusion of an irrigation solution, characterized in that the cannula is obtained in one piece by a thermoplastic microinjection molding process.
2. Canule d'irrigation selon la revendication 1 , caractérisée par le fait que la ou les ouvertures (5) ont une forme allongée et biseautée et orientée de sorte que le flux de solution d'irrigation qui sort du canal central (4) par la ou les ouvertures (5) soit essentiellement dirigé en direction de la première extrémité (2) de la partie active (1 ) de la canule. Irrigation cannula according to Claim 1, characterized in that the opening or openings (5) have an elongated and bevelled shape and oriented so that the flow of irrigation solution which exits the central channel (4) through the opening or openings (5) is essentially directed towards the first end (2) of the active part (1) of the cannula.
3. Canule d'irrigation selon l'une des revendications précédentes, caractérisée par le fait qu'elle comprend en outre une collerette (8) s'étendant radialement par rapport à la partie active (1 ) entre la seconde extrémité (3) et la ou les ouvertures (5), la collerette (8) étant flexible et déformable. 3. irrigation cannula according to one of the preceding claims, characterized in that it further comprises a flange (8) extending radially relative to the active portion (1) between the second end (3) and the opening or openings (5), the collar (8) being flexible and deformable.
4. Canule d'irrigation selon l'une des revendications précédentes, caractérisée par le fait qu'elle comprend en outre une saillie (9) s'étendant dans le canal central (4) à partir de la seconde extrémité (3) et agencée pour créer un phénomène de turbulence lorsque le flux de solution d'irrigation injectée dans le canal central (4) par la première extrémité (1 ) de la canule entre en contact avec ladite saillie (9), le phénomène de turbulence entraînant le changement de direction d'au moins une partie du flux de solution d'irrigation qui est alors redirigé vers la première extrémité (1 ), de sorte que ladite partie du flux s'échappe par la ou les ouvertures (5) en direction de la première extrémité (2) et non pas en direction de la seconde extrémité (3). 4. irrigation cannula according to one of the preceding claims, characterized in that it further comprises a projection (9) extending in the central channel (4) from the second end (3) and arranged to create a turbulence phenomenon when the flow of irrigation solution injected into the central channel (4) by the first end (1) of the cannula comes into contact with said projection (9), the turbulence phenomenon resulting in the change of direction of at least a portion of the flow of irrigation solution which is then redirected to the first end (1), so that said portion of the flow escapes through the opening (s) (5) towards the first end (2) and not towards the second end (3).
5. Canule d'irrigation selon l'une des revendications précédentes, caractérisée par le fait que la partie active (1 ) est flexible, avec une flexibilité croissante de la première extrémité (2) à la seconde extrémité (3). Irrigation cannula according to one of the preceding claims, characterized in that the active part (1) is flexible, with increasing flexibility from the first end (2) to the second end (3).
6. Canule d'irrigation selon l'une des revendications précédentes, caractérisée par le fait que la partie active (1 ) est conique, s'amincissant de la première extrémité (2) à la seconde extrémité (3). 6. irrigation cannula according to one of the preceding claims, characterized in that the active portion (1) is tapered, tapering from the first end (2) to the second end (3).
7. Canule d'irrigation selon l'une des revendications précédentes, caractérisée par le fait qu'elle est réalisée en un matériau thermoplastique comme le polyéthylène ou le polypropylène. 7. irrigation cannula according to one of the preceding claims, characterized in that it is made of a thermoplastic material such as polyethylene or polypropylene.
8. Canule d'irrigation selon l'une des revendications précédentes, caractérisée par le fait qu'elle est réalisée en un matériau plastique à haute fluidité. 8. irrigation cannula according to one of the preceding claims, characterized in that it is made of a plastic material with high fluidity.
9. Système d'irrigation endodontique comprenant une canule d'irrigation selon l'une des revendications précédentes. 9. Endodontic irrigation system comprising an irrigation cannula according to one of the preceding claims.
EP15763608.5A 2015-09-16 2015-09-16 Irrigation cannula, in particular for an endodontic irrigation device Withdrawn EP3349682A1 (en)

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