CH710763B1 - Syringe for the application of a dental material. - Google Patents

Abstract

The invention relates to a syringe (11) for application of a dental material, which can be inserted into an application device for dispensing the dental material. The syringe (11) comprises a preferably cylindrical container part (13) with an end face (15), to which an ejection nozzle (23) is assigned, and an open rear side (17) opposite the end face (15) with an opening (19) for Inserting a movable piston. In the container part (13), an axially movable piston is accommodated, wherein a cavity (21) for receiving the dental material is defined between the end face (15) of the container part (13) and the piston. The container part (13) and the ejection nozzle (23) are at least two separate components and the ejection nozzle arranged on the front side is connected to the container part such that the ejection nozzle (23) is movable relative to the container part (13).

Description

description

FIELD OF THE INVENTION The invention relates to a syringe for applying a dental mass according to the preamble of claim 1.

PRIOR ART [0002] Application devices are used to apply dental material to fill a cavity in 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. A syringe can be inserted into the application device in the area of the free end of the plunger. The syringe comprises a cylinder jacket which encloses a cavity, a piston which can be moved in the cavity and an ejection nozzle on an end face of the cylinder jacket. The syringe also includes a flange. With the help of the flange, the syringe is detachably held in the application device. The syringe is pre-filled with a single dose of dental material. After the dental compound has been pressed out by pushing the plunger 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 can be reused. Therefore, the application device can also be designed in a more complex manner and can therefore be operated with sensitivity and without jerks.

The cylinder jacket and the ejection nozzle are formed in one piece and are usually produced as a one-piece injection molded part. In order to facilitate the application of the dental material into the tooth cavity, the ejection nozzle is angled with respect to the longitudinal axis of the cylinder jacket. The syringes exist at different angles between the longitudinal axis of the syringe and the ejection nozzle in order to be able to reach all of the teeth of a patient easily. Different injection molds are required for the resulting different syringes.

OBJECT OF THE INVENTION The disadvantage of the described prior art results in the object initiating the present invention to further develop a generic syringe which is simplified and accordingly inexpensive to manufacture. Another object of the invention is to propose a generic syringe with improved user-friendliness ,

Description: The problem is solved in a syringe for applying a dental mass in that the container part and the ejection nozzle are at least two separate components and the ejection nozzle arranged on the end face is connected to the container part in such a way that the ejection nozzle is relative to the container part is mobile. The design feature that the container part and the ejection nozzle are separate components that can be manufactured separately leads to several advantages over the prior art, in which the container part and the ejection nozzle are in one piece. The container part, which is preferably produced by injection molding, can be the same for all syringes. A single injection mold is therefore sufficient for the container parts, which leads to 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 separate injection nozzles can also be removed from the mold in simply constructed injection molds, which leads to further reductions in investment costs. Of course, other liquids and pastes can also be applied with the syringe. For example, disinfectant liquids can be applied between the gums and tooth with the syringe.

The ejection nozzle is movable relative to the container part. As a result, the position of the ejection nozzle can be adjusted so that tooth holes to be filled are easier to reach with the ejection nozzle.

The invention is also preferably characterized in that the ejection nozzle has a first and second end, the first end facing away from the container part and the second end being held in a form-fitting and movable manner in the cavity.

The positive connection enables the ejection nozzle and the container part to be assembled quickly and hold together reliably.

Preferably, the second end of the ejection nozzle and the inside of the end face are connected with a joint. These can be different types of joints. Of course, preference is given to joints whose articulated parts can be easily removed from the mold.

In a particularly preferred embodiment, the second end of the ejection nozzle is shaped as a joint head and the inside of the end face as a socket of a ball joint. The ball joint enables a simple, movable connection without the need for additional components. The ball joint is tight to the dental mass when it is squeezed out of the cavity. Other joint forms would also be conceivable, for example a hinge joint.

CH 710 763 B1 [0011] The joint socket preferably engages around the joint head in such a way that the joint head is held pivotably in the joint socket. The joint head is pressed against the resistance of the socket and snaps into it. As a result, no further component is required for fixing the joint.

It proves to be advantageous if the socket has the shape of a spherical cap, as a result of which a narrowing is realized at the transition from the cavity to the socket. If the joint head overcomes the resistance caused by the narrowing when assembling the syringe, it snaps into the socket and is kept movable in the socket. The diameter of the constriction is preferably less than 1 mm smaller than the diameter of the cavity and the socket. The diameter of the joint head is preferably essentially the same size as the diameter of the cavity and the joint socket, so that the joint head is easily movable in the cavity and the joint socket.

In a further preferred embodiment of the invention, an elongated hole breaks through the end face, through which the ejection nozzle protrudes and along which the ejection nozzle is pivotably guided. The shape of an elongated hole simply means that the ejection nozzle can only be pivoted up and down and does not swing out to the side. The elongated hole determines the swiveling range of the ejection nozzle, since it hits the elongated hole in the upper and lower end positions. Another shape of the passage opening for the ejection nozzle would, of course, also be conceivable if it should also be pivotable to the sides, for example round or oval passage openings.

It has proven to be useful if the angular range in the slot 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 enables the ejection nozzle to easily reach each tooth hole by pivoting, regardless of the position of the tooth hole in a patient's oral cavity.

[0015] The spray nozzle expediently has a pivoting range between 20 and 90 degrees and preferably between 30 and 50 degrees in the elongated hole. As already explained in the last paragraph, such a pivoting area allows easy access to tooth holes that 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 useful if an ejection channel is provided in the ejection nozzle, which tapers conically from the second end to the first end. Such a shape of the ejection channel can be easily realized, since the ejection nozzle is manufactured as a separate component of the syringe. The conical ejection channel enables improved dosing of the dental mass.

The ejection channel can be adapted to the nature of the dental mass by the ejection channel having a conical taper in the area of the first end and the rest of the ejection channel being hollow cylindrical or the ejection channel having a conical taper in the area of the second end and the rest of the ejection channel is hollow cylindrical. Other configurations of the ejection channel are also conceivable if the nature of the dental compound requires it to be able to be applied sensitively.

Advantageously, the outside of the end face is hemispherical. It is therefore adapted to the shape of the socket, which optimizes the wall thickness of the front. Furthermore, a hemisphere shape is easy to demold.

The spray nozzle expediently has a coloring which coloring can be assigned to a specific dental material. The clear color of the ejection nozzle prevents the use of the wrong dental compound.

It proves to be advantageous if the ejection nozzle is made of plastic. As a result, it can be produced inexpensively by injection molding. Other materials, for example metal, are conceivable for the production of the ejection nozzle.

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

Further advantages and features emerge from the following description of an embodiment of the invention with reference to the schematic representations. In a representation that is not to scale:

1 shows a section through a first embodiment of a syringe for applying dental material;

2 shows a section through a second embodiment of a syringe for the application of dental material;

3 shows a section through a third embodiment of a syringe for the application of dental material and

4: an axonometric representation of the third embodiment.

CH 710 763 B1 [0024] A syringe for applying a dental material is shown in FIGS. 1 to 4 and is generally designated by reference number 11. The syringe 11 is constructed from the following components: A preferably cylindrical container part 13 has an end face 15 and a back side 17. The end face preferably has the shape of a hemisphere. An opening 19 is provided on the rear side 17 through which a piston can be inserted into the container part. The piston is not shown in the figures. A cavity 21 is provided in the container part 13, in which a dental mass can be received. To apply the dental material, the syringe 11 is inserted into an application device. By actuating a trigger guard, a plunger is moved forward and pushes the piston towards the front. The dental mass is thereby expressed from the cavity 21. The dental compound is applied into a tooth cavity via an ejection nozzle 23 which is arranged on the end face 15. The ejection nozzle 23 has a first end 25 which faces away from the end face 15 and can also be regarded as a tip. Furthermore, 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 in two pieces. In the prior art, the container part 13 and the ejection nozzle 23 are a single part and are therefore permanently connected to one another.

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 is designed as an articulated head 29 which is held pivotably in an articular socket 31. The joint socket 31 is formed on the inside of the end face 15 and engages around the joint head 29 such that it is held in the joint socket 31 in a form-fitting manner. The socket 31 has the shape of a spherical cap, the curved surface of which is larger than the curved surface of the hemisphere. As a result, a constriction 32 is formed at the transition between the socket 31 and the cavity 21. The joint head 29 can therefore snap into the socket 31 after overcoming resistance and is then held in the socket 31 without further holding elements. The diameter at the constriction 32 is preferably only less than 1 mm smaller than the diameter of the cavity.

The end face 15 is pierced by an elongated hole 33 through which the ejection nozzle 23 projects. The slot 33 specifies 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 elongated hole 33. The pivoting movement of the ejection nozzle 23 is limited by the two attachment points on the elongated hole 33.

The elongated hole 33 is formed asymmetrically on the hemispherical end face 15 that the ejection nozzle 23 can assume a certain 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 a patient's teeth can be easily reached. In order to enable the spray nozzle position to be fine-tuned, the spray nozzle can be pivoted up and down along the elongated hole 33 from the basic position.

In Fig. 3, the ejection nozzle 23 is pivoted up to the upper stop point on the elongated hole 33. The pivoting range 41 is preferably 40 degrees. The ejection nozzle 23 can therefore be pivoted 20 degrees up and down from the basic position. In this way, the ejection nozzle 23 can be adapted to the most varied of positions in order to be able to easily reach a tooth cavity.

Another advantage of the two-part design 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 the case of a one-piece design, such a configuration of the ejection channel 43 cannot be produced or can be produced only with great effort. If the syringe 11 is produced in one piece using the injection molding process, it is difficult to demold an injection channel that tapers outwards, since it represents a so-called undercut.

1, 2 and 3, various forms of tapering the ejection channel 43 are shown. For example, a cone tapering in the injection direction can be provided at the first or at the second end 25, 27 (FIGS. 1 and 3). It is also possible that the spray 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 mass. The ejection channel can be designed in such a way that the dental mass can be expressed particularly easily.

Another advantage of the two-part design 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 spray nozzles can expediently be made of plastic or else of metal. They can have different colors, so that the syringe 11 can provide information about which dental mass is filled in the cavity 21.

So that the syringe 11 stops in an application device after it has been inserted into it, a flange 45 is formed on the rear side 17.

CH 710 763 B1

Legend [0035]

syringe

container part

front

back

opening

cavity

ejection nozzle

First end

Second end

joint head

socket

narrowing

Long hole

Longitudinal axis of the container part

Longitudinal axis of the ejection nozzle

Beam angle, angular range

pivoting

spraying duct

flange

Claims (15)

claims 1. Syringe (11) for applying a dental material, which can be inserted into an application device for dispensing the dental material, comprising - A preferably cylindrical container part (13) with an end face (15) on which an ejection nozzle (23) is arranged - An open back (17) opposite the end face (15) with an opening (19) for inserting a movable piston and - A piston which is axially movable in the container part (13), a cavity (21) for receiving the dental material being defined between the end face (15) of the container part (13) and the piston, characterized in that the container part (13) and the ejection nozzle (23) are at least two separate components and the ejection nozzle (23) arranged on the end face (15) is connected to the container part (13) such that the ejection nozzle (23) is movable relative to the container part (13). 2. Syringe according to claim 1, characterized in that the ejection nozzle (23) has a first and second end (25, 27), the first end (25) facing away from the container part (13) and the second end (27) is positively and movably held in the cavity (21). 3. Syringe according to claim 2, characterized in that the second end (27) of the ejection nozzle (23) and the inside of the end face (15) are connected with a joint. 4. Syringe according to one of claims 2 or 3, characterized in that the second end of the ejection nozzle (23) is formed as a joint head (29) and the inside of the end face (15) as a socket (31) of a ball joint. 5. Syringe according to claim 4, characterized in that the joint socket (31) engages around the joint head (29) such that the joint head (29) is held pivotably in the joint socket (31). 6. Syringe according to claim 4 or 5, characterized in that the joint socket (31) has the shape of a spherical cap, whereby a narrowing (32) is realized at the transition from the cavity (21) to the joint socket (31). CH 710 763 B1 7. Syringe according to one of the preceding claims, characterized in that an elongated hole (33) through the end face (15) through which the ejection nozzle (23) protrudes and along which the ejection nozzle (23) is pivotally guided. 8. Syringe according to claim 7, characterized in that the angular range (39) in the elongated hole (33), between which the ejection nozzle (23) is pivotable relative to the longitudinal axis of the container part (13), between 10 and 80 degrees, preferably between 15 and 70 degrees and particularly preferably between 20 and 65 degrees. 9. Syringe according to claim 7, characterized in that the ejection nozzle (23) in the elongated hole (33) has a pivoting range (41) between 20 and 90 degrees and preferably between 30 and 50 degrees. 10. Syringe according to one of claims 2 to 9, characterized in that an ejection channel (43) is provided in the ejection nozzle (23), which tapers conically from the second end (27) to the first end (25). 11. Syringe according to one of claims 2 to 9, characterized in that in the ejection nozzle (23) an ejection channel (43) is provided in the region of the first end (25), which has a conical taper and the rest of the ejection channel (43) is hollow cylindrical. 12. Syringe according to one of claims 2 to 9, characterized in that an ejection channel (43) is provided in the region of the second end (27) in the ejection nozzle (23), which 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 outside of the end face (15) is hemispherical in shape. 14. Syringe according to one of the preceding claims, characterized in that the ejection nozzle (23) has a color, which color can be assigned to a specific dental mass. 15. Syringe according to one of the preceding claims, characterized in that the ejection nozzle (23) consists of plastic. CH 710 763 B1