WO2016131160A1 - Syringe for applying a dental compound - Google Patents

Abstract

The invention relates to a syringe (11) for applying a dental compound, said syringe being insertable into an application device in order to discharge the dental compound. The syringe (11) comprises a preferably cylindrical container part (13) with an end face (15) comprising an ejection nozzle (23) and an open rear face (17) which lies opposite the end face (15) and comprises an opening (19) for inserting a movable plunger. An axially movable plunger is received in the container part (13), and a cavity (21) for receiving the dental compound is defined between the end face (15) of the container part (13) and the plunger. The container part (13) and the ejection nozzle (23) are designed in at least two parts and are connected together such that the ejection nozzle (23) can be moved relative to the container part (13).

Description

 Syringe for the application of a dental material

Field of the invention

 The invention relates to a syringe for applying a dental composition according to the preamble of claim 1.

State of the art

 Applicators are used to apply dental material to fill a cavity on a tooth. Such application devices are similar to a pistol grip with a trigger. The movement of the trigger causes the linear movement of a ram. In the area of the free end of the plunger, a syringe can be inserted into the application device. The syringe comprises a cylinder jacket which encloses a cavity, a piston movable in the cavity and an ejection nozzle on an end face of the cylinder jacket. Furthermore, the syringe comprises a flange. With the help of the flange, the syringe is releasably held in the application device. The syringe is pre-administered with a single dose of dental material. After pressing the dental material by the plunger pushes the piston in the direction of the ejection nozzle, the syringe can be removed from the application device and disposed of. This has the advantage that the application device is reusable. Therefore, the application device can also be designed more complex and is accordingly sensitive and smoothly operable.

The cylinder jacket and the ejection nozzle are integrally formed and are usually manufactured as a one-piece injection molded part. For easier application of the dental material in the tooth cavity, the ejection nozzle is angled relative to the longitudinal axis of the cylinder jacket. The syringes exist with different angles between the longitudinal axis of the syringe and the ejection nozzle in order to be able to reach all teeth of a patient well. For the resulting different syringes different injection molds are necessary.

confirmation copy Object of the invention

 From the disadvantage of the described prior art, the task initiating the present invention results in the further development of a syringe of the generic type, which is simplified and correspondingly inexpensive to produce. Yet another object of the invention is to propose a generic syringe with improved ease of use.

description

 In the case of a syringe for application of a dental compound, it is advantageous if the container part and the ejection nozzle are connected to one another such that the ejection nozzle is held movably in the container part by a joint.

 The solution of the problem is achieved in a syringe according to the preamble of claim 1, characterized in that the syringe from the container part, the Ausspritzdüse and the piston, whereby the syringe is formed in three pieces and that the second end of the Ausspritzdüse as a condyle and the inside of the front page as Joint socket emes ball joint are formed. The constructive feature that the container part and the ejection nozzle are two components which can be produced separately leads to several advantages over the prior art, in which the container part and the ejection nozzle are integral. The container part, which is preferably produced by injection molding, can be the same for all syringes. Therefore, a single injection mold is sufficient for the container parts, resulting in corresponding savings in investment costs. The different ejection nozzles can be produced independently of the container part. The shape of the ejection nozzles can be made much more flexible than if the container part and ejection nozzle are produced in one piece. The demolding of the separate ejection nozzles can also be done in a simple design injection molds, which leads to further reductions in investment costs. Of course, other liquids and pastes can be applied with the syringe. For example, can be applied with the syringe disinfectant fluids between the gums and teeth.

The ejection nozzle is movable relative to the container part. Thereby, the position of the ejection nozzle is adjustable so that to be filled tooth holes with the ejection nozzle easier to reach. The ball joint allows a simple, movable connection without the need for additional components. The ejection nozzle can not only be pivoted in one plane, but is three-dimensional pivotable and rotatable with the joint head. The setting of the ejection nozzle relative to the container part is therefore particularly flexible. The ball joint is close to the dental mass when it is expressed from the cavity.

 The joint socket preferably surrounds the joint head such that the joint head is pivotably held in the joint socket. The condyle is pressed against the resistance of the socket in this and snapped with this. As a result, no further component for joint fixation is necessary.

 It proves to be advantageous if the socket has the shape of a spherical cap, whereby at the transition from the cavity to the socket a constriction is realized. If, during assembly of the syringe, the condyle overcomes the resistance caused by the constriction, it will snap into the socket and be held movably in the socket. The diameter of the constriction is preferably less than 1 mm smaller than the diameter of the lumen and the socket. Preferably, the diameter of the condyle is substantially the same size as the diameter of the lumen and the socket, so that the condyle is easily movable in the lumen and the socket.

In a particularly preferred embodiment of the invention, the ejection nozzle is insertable through the back into the container part and the condyle is locked by overcoming the constriction in the socket. The through-hole through which the ejection nozzle protrudes from the container part can therefore be kept small since the condyle does not have to be forced through it to build the syringe together. The assembly through the back of the container part therefore allows the ejection nozzle is held very reliable in the container part and can not be pushed out through the passage opening together with the dental material.

In a further preferred embodiment, the joint head and the joint socket are free of expansion joints, which facilitate a locking of the two joint elements. Because the syringe has to be so small that it is in the mouth of one Patient movements are possible, such expansion joints are not necessary. The locking without expansion joints is therefore carried out without damaging the ejection nozzle or the container part. The components and / or their injection molds can therefore be designed simply, resulting in low production costs and a simplified demolding. Expansion joints are inevitable in joints with larger dimensions than they occur in the syringe, otherwise the components can be destroyed during assembly.

 Conveniently, a passage opening is provided on the end face through which the ejection nozzle protrudes and which limits the range of motion of the ejection nozzle relative to the container part. The limitation of the passage opening specifies the versc venkbereich in which the ejection nozzle can be moved.

 In a further preferred embodiment of the invention, the passage opening is circular or a slot along which / which the ejection nozzle is guided pivotably. The shape of a slot causes in a simple manner that the ejection nozzle is only pivotable up and down and does not swivel to the side. The slot determines the pivoting range of the ejection nozzle, since this strikes in the upper and lower end position of the slot. Conceivable, of course, would also be a different shape of the through hole for the ejection nozzle, if this should also be three-dimensionally pivotable to the sides, for example, round or oval through holes.

 It has proved to be expedient if the angle range between which the ejection nozzle is pivotable relative to the longitudinal axis of the container part is between 10 and 80 degrees, preferably between 15 and 70 degrees and particularly preferably between 20 and 65 degrees. This angular range allows the ejection nozzle to reach well by pivoting each tooth hole, regardless of the location of the tooth hole in the oral cavity of a patient.

Conveniently, the ejection nozzle in the slot has a pivoting range between 20 and 90 degrees and preferably between 30 and 50 degrees. As already stated in the last paragraph, such a dimensioned pivoting range allows good accessibility of tooth holes which are to be filled with dental material. The invention is also preferably characterized in that an ejection channel is provided in the ejection nozzle which tapers from the second end to the first end.

 It has proven to be expedient if an ejection channel is provided in the ejection nozzle, which tapers conically from the second end to the first end. Such a shaping of the ejection channel can be realized simply because the ejection nozzle is produced as a separate component of the syringe. The conical ejection channel allows for improved dosing of the dental material.

 The ejection channel can be adapted to the nature of the dental material in that the ejection channel in the region of the first end has a conical taper and the rest of the ejection channel is hollow cylindrical or the ejection channel in the region of the second end has a conical taper and the rest of the ejection channel is hollow cylindrical. Also conceivable are other embodiments of the ejection channel, if it requires the nature of Dentaimasse to be applied sensitively.

 Advantageously, the front side is hemispherical in shape. It is thereby adapted to the shape of the socket, whereby the wall thickness of the end face is optimized. Furthermore, a hemisphere shape is easy to demold.

 Conveniently, the ejection nozzle has a coloring, which coloration of a particular dental material can be assigned. An application of a wrong dental material is avoided by the unique color of the ejection nozzle.

 It proves to be advantageous if the ejection nozzle is made of plastic. As a result, it is inexpensive to produce by injection molding. Other materials, such as metal are conceivable for the production of Ausspritzdüse.

It is advantageous if a flange for detachable mounting in the application device is formed on the rear side of the container part. The syringe can be connected to the application device in a few seconds and removed from it.

Further advantages and features will become apparent from the following description of an embodiment of the invention with reference to the schematic tables Darstel-. It shows in not to scale representation: Figure 1: a section through a first embodiment of a syringe for

Application of dental material;

 2 shows a section through a second embodiment of a syringe for

 Application of dental material;

 3 shows a section through a third embodiment of a syringe for

 Application of dental material and

 Figure 4: an axonometric view of the third embodiment.

A syringe for applying a dental composition is shown in FIGS. 1 to 4 and designated overall by reference numeral 11. The syringe 11 is made up of the following components: A preferably cylindrical container part 13 has an end face 15 and a rear side 17. The end face preferably has the shape of a hemisphere. On the back 17, an opening 19 is provided through which a piston can be inserted into the container part. The piston is not shown in the figures. In the container part 13, a cavity 21 is provided, in which a dental material is received. For application of the dental material, the syringe 11 is inserted into an application device. By operating a trigger guard, a plunger is moved forward and pushes the piston in the direction of the front side. As a result, the dental composition is expressed from the cavity 21. Via an ejection nozzle 23, which is arranged on the front side 15, the Dentahnasse is applied in a tooth cavity. The ejection nozzle 23 has a first end 25, which faces away from the end face 15 and can also be considered as a tip. Further, the ejection nozzle 23 has a second end 27, with which the ejection nozzle 23 is pivotally connected to the end face 15.

 As the figures show, the container part 13 and the ejection nozzle 23 are two separate components and therefore formed in two pieces. In the prior art, the container part 13 and the ejection nozzle 23 are a single part and therefore permanently connected to each other.

The ejection nozzle 23 and the container part 13 are articulated in the region of the end face 15 with a ball joint. For this purpose, the second end 27 as a joint head 29th formed, which is held pivotably in a joint socket 31. The joint socket 31 is formed on the inside of the end face 15 and surrounds the joint head 29 in such a way that it is held in the joint socket 31 in a form-fitting manner. The joint socket 31 has the shape of a spherical cap whose curved surface is larger than the curved surface of the hemisphere. As a result, a constriction 32 is formed at the transition between joint socket 31 and cavity 21. The joint head 29 can therefore snap into the joint socket 31 after overcoming a resistance and is then held in the joint socket 31 without further holding elements. Preferably, the diameter at the constriction 32 is smaller by less than 1 mm from the diameter of the cavity.

 The end face 15 is pierced by a slot 33 through which the ejection nozzle 23 protrudes. The slot 33 defines the direction of movement for the pivoting of the ejection nozzle 23 relative to the container part 13. That is, the ejection nozzle 23 is guided along the slot 33. The pivoting movement of the ejection nozzle 23 is limited by the two attachment points on the slot 33.

 The oblong hole 33 is formed asymmetrically on the hemispherical end face 15 in such a way that the ejection nozzle 23 can assume a specific basic position relative to the container part 13. In this basic position, the longitudinal axis of the container part 35 and the longitudinal axis of the ejection nozzle 37 enclose an opening angle 39, which is preferably 45 degrees. With this basic position, most of the cavities on the dentition of a patient can be easily reached. In order to enable fine tuning of the ejection nozzle position, the ejection nozzle can be pivoted upwards and downwards along the slot 33 from the basic position.

 In Figure 3, the ejection nozzle 23 is pivoted up to the upper stop point on the slot 33. The pivoting range 41 is preferably 40 degrees. The Ausspritzdüse 23 can therefore be pivoted from the basic position each 20 degrees up and down. Thus, the ejection nozzle 23 can be adapted to a variety of positions in order to achieve a tooth cavity well.

A further advantage of the bipartite of the ejection nozzle 23 and the container part 13 is that the ejection channel provided in the ejection nozzle 23 can taper from the second end 27 to the first end 25. In a one-piece design is a Such an embodiment of the ejection channel 43 is not or only very expensive to produce. If the syringe 11 is produced in one piece by the injection molding process, an outwardly tapering ejection channel can be removed from the mold, since it constitutes a so-called undercut.

In Figures 1, 2 and 3, various forms of tapering of the ejection channel 43 are shown. For example, a tapering cone in the ejection direction may be provided at the first or at the second end 25, 27 (FIG. 1 and FIG. 3). It is also possible that the ejection channel 43 tapers uniformly over its entire length (FIG. 2). The configuration of the shape of the ejection channel 43 is determined by the type of dental material. The ejection channel can be designed such that the dental material can be expressed particularly easily.

 Yet another advantage of the bipartite of the ejection nozzle 23 and the container part 13 is that the same container part 13 can always be used for different ejection nozzles 43. Therefore, only a single injection mold is necessary for the production of the container parts 13.

 The ejection nozzles can conveniently be made of plastic or else of metal. They may have different colors, whereby the syringe 11 can provide information about which dental material is filled in the cavity 21.

To keep the syringe 11 in an applicator after it has been inserted into it, a flange 45 is formed on the back 17.

Legend:

11 syringe

 13 container part

 15 front side

 17 back side

 19 opening

 21 cavity

 23 ejection nozzle

 25 First End

 27 Second end

 29 condyle

 31 socket

 32 constriction

 33 slot

 35 longitudinal axis of the container part

37 longitudinal axis of the ejection nozzle

39 opening angle, angle range

41 pivoting area

 43 ejection channel

 45 flange

Claims

claims Syringe (11) for application of a dental composition, which can be used in an application device for discharging the dental material, comprising  a preferably cylindrical container part (13) having an end face (15) and an open rear side (17) opposite the end face (15) and having an opening (19) for inserting a movable piston,  an ejection nozzle (23) movably mounted on the end face (15) relative to the container part, having first and second ends (25, 27), the first end (25) being remote from the container part (13) and the second end (27) in the cavity (21) is movably held by a hinge and  a in the container part (13) axially movable piston, wherein between the end face (15) of the container part (13) and the piston, a cavity (21) is defined for receiving the dental material,  characterized,  that the syringe consists of the container part (13), the ejection nozzle (23) and the piston, whereby the syringe is formed in three pieces and  in that the second end (27) of the ejection nozzle (23) is designed as a joint head (29) and the inside of the end face (15) as a joint socket (31) of a ball joint. Syringe according to claim 1, characterized in that the joint socket (31) surrounds the condyle (29) in such a way that the condyle (29) is pivotably held in the socket (31). Syringe according to claim 1 or 2, characterized in that the socket (31) has the shape of a spherical cap, whereby at the transition from the cavity (21) to the socket (31) a constriction (32) is realized. Syringe according to one of the preceding claims, characterized in that the ejection nozzle can be introduced through the rear side (17) into the container part (13) and the condyle (29) can be locked in the joint socket (31) by overcoming the constriction (32). 5. Syringe according to one of the preceding claims, characterized in that the condyle (29) and the socket (31) are free of expansion joints, which facilitate a locking of the two hinge elements. 6. Syringe according to one of the preceding claims, characterized in that on the end face (15) has a passage opening (33) through which the ejection nozzle (23) protrudes and which the range of motion of the ejection nozzle (23) relative to the container part (13 ) limited. 7. Syringe according to one of the preceding claims, characterized in that the passage opening is circular or an oblong hole (33), along which more / which the ejection nozzle (23) is guided pivotably. 8. Syringe according to one of the preceding claims, characterized in that the angular range (39) between which the ejection nozzle (23) relative to the longitudinal axis of the container part (13) is pivotable, between 10 and 80 degrees, preferably between 15 and 70 degrees and more preferably between 20 and 65 degrees. 9. Syringe according to one of claims 7 to 8, characterized in that the ejection nozzle (23) in the passage opening (33) has a Versch venkbereich (41) between 20 and 90 degrees and preferably between 30 and 50 degrees. 10. Syringe according to one of the preceding claims, characterized in that in the ejection nozzle (23) an ejection channel (43) is provided which tapers conically from the second end (27) to the first end (25). 11. Syringe according to one of the preceding claims, characterized in that the ejection channel (43) in the region of the first end (25) has a conical taper and the rest of the ejection channel (43) is hollow cylindrical. 12. Syringe according to one of the preceding claims, characterized in that the ejection channel (43) in the region of the second end (27) has a conical taper and the rest of the ejection channel (43) is hollow cylindrical. 13. Syringe according to one of the preceding claims, characterized in that the end face (15) is formed hemispherical. 14. Syringe according to one of the preceding claims, characterized gekennzeiciinet that the ejection nozzle (23) has a coloring, which coloration of a particular dental material can be assigned. 15. Syringe according to one of the preceding claims, characterized gekennzeiciinet that the ejection nozzle (23) consists of plastic.