WO2020151937A1

WO2020151937A1 - Cartridge

Info

Publication number: WO2020151937A1
Application number: PCT/EP2020/050221
Authority: WO
Inventors: Alexander Bublewitz; Jens-Peter Reber
Original assignee: 3lmed GmbH
Priority date: 2019-01-23
Filing date: 2020-01-07
Publication date: 2020-07-30
Also published as: DE102019101640A1

Abstract

The invention relates to a cartridge, syringe or compule having at least one chamber (4) with a tubular chamber wall (5), a connection region (6), arranged on an output end, for connecting the cartridge (1, 20), syringe or compule to an accessory part (26), wherein each chamber (4) has at least one outlet opening (7), which opens into the connection region (6), and having a plunger unit (2, 22), which has, for each chamber (4), a plunger rod (12) for moving an output plunger (23) received in the respective chamber (4). The at least one chamber (4) is provided inside an encasing (8), which encompasses the respective chamber wall (5), at least in regions, and is integrally formed therewith. The encasing (8) has at least one guide slot (9), in which an indicator rod (13), which is connected to the plunger unit, is movably guided.

Description

cartridge

The present invention relates to a cartridge, syringe or compule with at least one chamber, each having a tubular chamber wall, a connection area located at a dispensing end for connecting the cartridge, syringe or compule with an accessory, and with a plunger unit for each Chamber each has a push rod for displacing a discharge piston accommodated in the respective chamber.

In the dental field, such cartridges, syringes or compulses are used to store and discharge dental materials. The cartridges, syringes or computers should not only protect the dental materials stored in them from environmental influences, but also allow the materials to be discharged in a user-friendly and precise manner. For this purpose, they are partly provided with a removable closure that can be attached to the connection area. Another accessory can also be attached to the dispensing area in order to dispense and / or mix dental materials, for example a mixer, a dispensing spout or the like. Applicator.

A generic cartridge system is known from WO 2013/026717 A1. This system comprises two containers with a common connection area, into which the respective outlets of the containers open and can be connected to a discharge mixer.

The cartridge arrangement described in DE 10 2010 049 378 B4 comprises a double cartridge with two separate containers, which are objected to by one another only at their end opposite the dispensing end, ie the rear end viewed in the material discharge direction, are connected to one another by a bridge. The arrangement also contains a support cartridge into which the two containers can be inserted such that they are axially secured within the support cartridge.

EP 2 772 221 B1 and US 8,007,164 B2 disclose a dental mixer with two syringes arranged parallel to one another, which are enclosed by a separate sleeve. A mixing tip can be inserted and locked into the sleeve, so that a dental material stored inside the syringes can flow into the mixing tip, mixed there and then discharged.

If the material accommodated in the cartridge is to be dispensed by hand, it is known to use a tappet unit which has a push rod for each chamber for displacing a dispensing piston received in the respective chamber. DE 10 2015 110 442 A1 shows such a tappet unit, for example for chambers which are concentric with one another.

With the known cartridges mentioned above, it is not possible to determine the position of the piston within the chamber of the cartridge. From DE 10 2005 01 1 643 A1 a cartridge with only one chamber is known in which a piston is slidably mounted. The piston also serves as a Füllstandsan show, since a slot is formed in the wall of the chamber through which the Kol ben is visible from the outside. This can negatively affect the tightness of the cartridge.

A disadvantage of known solutions is that, especially in the case of concentrically arranged chambers, individual components of the materials migrate between the chambers and can lead to hardening of the dental material within the container in the case of long storage times. This will make the materials and the containers unusable. It is also disadvantageous that known containers and cartridges often have areas which easily become dirty and therefore, particularly when used in a patient's mouth area, form a germ area in which reproductive germs are deposited and can thus represent a risk of infection.

It is therefore an object of the present invention to provide a cartridge or a carrying system with such a cartridge, which do not have the disadvantages described above. In particular, the cartridge should be advantageously designed in terms of hygiene and handling.

This object is achieved with a cartridge, syringe or compule, which has at least one chamber, each with a tubular chamber wall. The cartridge, syringe or compule is also provided with a connection area located at a dispensing end for connecting the cartridge, syringe or com pule with an accessory, for example a closure, a mixer, a dispensing spout or the like.Applicator, each chamber having at least one Has outlet opening that opens into the connection area. In addition, the cartridge, syringe or compule has a plunger unit which has a plunger rod for each chamber for displacing a dispensing piston which is accommodated in the respective chamber. Using the push rod, the respective delivery piston can be moved within the chamber, e.g. to remove the valley material from the chamber.

The at least one chamber is provided within a casing encompassing the respective chamber wall, at least in regions, and is formed integrally therewith. In other words, the chambers are at least in part within the casing that bil det the outer surface of the cartridge, wherein parts of the outer surface can also be formed by the chamber wall or walls itself. In particular, the sheathing is in sections formed by the at least one chamber wall and in sections by an outer wall arranged radially outside the at least one chamber wall.

According to the invention, the casing has at least one guide slot, in which an indicator rod, which is connected to the plunger unit, is guided in a displaceable manner. In this way it is possible to use the plunger unit to form a fill level indicator for the cartridge, syringe or compule, the position of the indicator rod being visible from the outside. This can be achieved, for example, by the guide slot being open to the outside. As an alternative or in addition to this, it is possible for the sheathing to be at least partially translucent or transparent. For example, the sheathing is opaque in some areas and translucent or transparent in some areas, the guide slot being provided in the translucent or transparent area of the sheathing.

Since the guide slot is formed in the casing and not in the chamber wall, the tightness of the chamber is not affected by the level indicator formed together with the indicator rod. Nevertheless, the position of the dispensing piston within the chamber can be precisely displayed using the indicator rod on the tappet unit. For example, it is possible to provide the translucent or transparent area of the casing and / or an area near the guide slot with a scale. As an alternative or in addition, it is possible to design the display rod or an area thereof, in particular the area facing the dispensing end, as an optically perceptible display element, for example by means of a coloring and / or a projection.

The display element can be designed as flakes and / or protrusions on the display rod. The indicator rod can protrude further than the push rods in the direction of deployment, so that the indicator rod is longer, for example than the push rod and the piston together. As a result, the display shows the (filling) level of the material in the cartridge and not the position of the rear end of the piston in the dispensing direction in the cartridge. The piston can be formed separately or directly on the respective push rod.

Regardless of the function as part of a level indicator, he indicator rod according to the invention has the advantage that the plunger unit with the at least one push rod is guided better in the cartridge. Tilting of the plunger unit relative to the cartridge, syringe or compule can thus be avoided, so that incorrect operation can be avoided.

The cartridge, syringe or compule according to the invention can have a single chamber. In this case, the tappet unit has a push rod and at least one, preferably two, indicator rods. In the case of a cartridge, syringe or compule with two chambers, the plunger unit has, for example, two plunger rods and an indicator rod. The use of a tappet unit with three tappet or indicator rods for a cartridge, syringe or compule with one or two chambers is found to be particularly advantageous with regard to the guidance of the tappet unit relative to the cartridge, syringe or compule.

Regardless of the guidance of the plunger unit within the cartridge, syringe or compule, it is preferred if the casing has at least one ras telement and at least one plunger rod and / or at least one indicator rod has at least one locking counter element. For example, locking notches can be provided on the respective rod and a locking lug on the casing. As also described in DE 10 2005 041 962 A1, such catches can easily be overcome manually in order to receive, for example, acoustic or tactile feedback when the dispensing pistons are turned a defined amount can be moved within the chambers. The locking lugs and locking notches are used for exact dosing.

The locking element can be provided on the inner wall of the casing and / or within the casing on the outer wall of at least one chamber. A complementary locking counter element is preferably provided on the push rod and / or display rod, which is separate from the cartridge, and which can each be part of a discharge system.

It is further preferred if the latching means are designed in such a way that when the push rod is moved in the material discharge direction they are brought into engagement with one another and in particular prevent or at least make it difficult to pull out the push rod against the material discharge direction. For this purpose, the locking means can be formed as a web with a sawtooth structure. If the latching means prevent or complicate a pulling out of the push rod, the discharge of the materials stored within the chambers is facilitated, which is particularly advantageous in the case of highly viscous materials. It also prevents material already brought out of the chambers from being pulled back into the chambers by moving the push rod against the material discharge direction and contaminating the stored material there and / or making the cartridge unusable by curing.

A stiffening element can be provided on the push rod, which preferably extends parallel to the push rod or indicator rods. When the materials are discharged from the cartridge, for which purpose the at least one plunger rod is displaced in the material discharge direction, the stiffening element is inserted into the free space and is preferably guided there. As a result, the stiffening element stabilizes the push rod when the material is being discharged from the cartridge, which is particularly advantageous for cartridges with a small internal volume of the chambers, since here correspondingly small to the longitudinal axis of the There are radial cross sections lying in the chambers, which require correspondingly small dimensions from the plunger of the discharge plunger. Due to the verbun which material thickness of the push rod, it can easily lead to bending or breakage of the push rod, which can be prevented by the stiffening element.

In continuation of this idea, the stiffening element can also have the locking means described above.

Preferably, a space is formed inside the casing, in particular between the inner wall of the casing and the outer wall of the chambers. This space can be filled with air. This prevents migration of components of the components between the chambers.

Regardless of the design of the casing with at least one guide slot and a corresponding indicator rod of the plunger unit, a further aspect of the invention relates to a cartridge, syringe or compule in which the radial cross section of the outer casing's longitudinal axis is at least partially elliptical in shape. The longitudinal axis of the casing is parallel to the longitudinal axis of the at least one chamber. In the case of a cartridge, syringe or compule with two chambers, these are preferably arranged parallel to one another and next to one another, so that the longitudinal axis of the ellipse coincides, for example, with an axis running between the two chambers. In the sense of this invention, a cross-sectionally elliptical sheathing is also understood to mean a sheathing which in cross-section, for example, is oval or rounded, for example, rectangular, in particular a rectangular cross-section, the short sides of which are rounded off by semicircles or ellipse sections. This design of the sheathing allows the cartridge, syringe or compule to be held particularly pleasantly between two fins when in use. This also improves usability. An additional advantage is that such a closed outer contour makes it more difficult for dirt and germs to deposit on the cartridge, syringe or compule. In addition, a continuous surface is created that is suitable for attaching a label or the like.

In continuation of this idea, the outer wall of the casing is aligned with the cylindrical outer wall of the connection area at its maximum extent that is radial to the longitudinal axis of the casing. As a result, the formation of a step between the casing and the connection area, which can be a possible germ area, is avoided as far as possible, which is advantageous from a hygienic point of view. In addition, this also improves operability, since the cartridge, syringe or compule could get caught in the oral cavity due to the formation of a step between the casing and the connection area during use.

According to the invention, these are preferably arranged next to one another in a cartridge, syringe or compule with two chambers. The arrangement of the chambers next to one another prevents or at least significantly reduces migration between the chambers, while at the same time the casing ensures that the space between the chambers cannot become dirty. Since the casing is also made in one piece with the chambers, contamination of the space between the chambers cannot occur before the chambers are inserted into a separately provided casing, which is a problem in particular with known refill cartridges. Here the pollution is often covered by the casing and therefore not recognizable from the outside, which favors nucleation. It is also advantageous that the casing enables simple and automatic labeling over the entire circumference of the casing. In particular in the case of cartridges which are intended to be used within the mouth area of a patient, labeling in the case of chambers arranged next to one another often leads to the formation of a space covered by the label, which is almost inaccessible due to the labeling and therefore cannot be cleaned or cannot be cleaned sufficiently. As already explained above, such a room area often represents a germ area and therefore an infection risk.

Since labeling of the cartridge is regularly prescribed, the casing according to the invention offers an advantage here in terms of hygiene. The casing according to the invention also offers an additional surface for labeling and printing regulatory requirements, which is particularly advantageous in the case of cartridges with small volumes, since these often do not offer enough space for printing without a corresponding casing.

It is preferred if the sheathing is formed in sections by the chamber walls and in sections by an outer wall arranged outside the chamber walls.

According to a preferred embodiment, the chambers are arranged at a distance from one another. In other words, the chamber walls of a chamber have no, in particular no direct, contact surface with the chamber walls of the other chamber. The spacing of the chambers from one another prevents migration of materials stored within the chambers through the chamber walls. This is particularly advantageous with common 2-component materials, since these materials often harden when mixed together, which is why migration through the chamber walls leads to this may mean that the stored material is no longer flowable and must therefore be discarded together with the cartridge.

It is preferred if the connection area has a bayonet connection or a threaded connection for connection to an accessory and the connection area further comprises a coded opening for receiving a positioning element attached to the accessory. For example, the positioning element can be designed as described in DE 10 2012 003 390 A1, the cartridge, syringe or compule having a correspondingly designed positioning opening.

The positioning element can be configured as described above and can be provided on an accessory that can be connected to the connection area. Therefore, the positioning element is counter to the material discharge direction, i.e. from the discharge end, introduced into the free space, while the plunger unit together with the locking means and / or the stiffening element in the material discharge direction, i.e. be introduced into the free space from the end opposite the dispensing end.

It is further preferred if the casing has a folded collar at an end opposite the connection area. On the one hand, this allows the cartridge to be flanged easily and, on the other hand, it is easy to carry off the materials stored within the chambers, since a user's fingers can rest on the pleated collar and the cartridge can be held in place in this way.

In particular, the pleated collar has an essentially square cross section lying to the longitudinal axis of the sheathing ra dial. The outer edges and corners can be rounded. The fold is preferably collar designed concentric to the longitudinal axis of the cartridge. It is particularly preferred if the neck collar has regions which are inclined and radially projecting away in a first direction counter to the material discharge direction and which allow a user's fingers to be placed on, so that the cartridge can be held firmly. In the event that the casing has an elliptical cross section lying radially along the longitudinal axis of the cartridge, it is particularly preferred that the areas inclined against the material discharge direction lie along the minor axis of the elliptical casing.

It is further preferred if the wall thickness of the casing corresponds to 90% to 1 10% of the wall thickness of at least one of the chamber walls. This simplifies the manufacture of the cartridge.

It is preferred if the chamber walls, if appropriate with the exception of the area for guiding the display plunger, are opaque. This means that light-curing materials can also be safely stored in the chambers. It is particularly preferred to provide the opaque chamber walls in combination with a partially translucent or transparent outer wall described above and / or a recess in the outer wall of the casing. As a result, both the materials in the chambers can be stored protected from light and at the same time the fill level can be displayed in a particularly simple manner for a user. This is not possible with known solutions, since the chamber walls are either opaque and protect the stored materials from the influence of light or are translucent and thus indicate a fill level.

The invention further relates to a discharge system with a cartridge as described above, an attached part, in particular a sealing plug and / or mixer, and a plunger unit as part of the cartridge, syringe or compule. The plunger unit preferably has two plungers, the spacing and length of which are adapted to the arrangement and dimensions of the chambers, so that one plunger can be introduced into each chamber. Both plungers are connected at one end via a pressure flange, so that a user can move the plunger in relation to the cartridge in the material discharge direction by applying pressure to the pressure flange. The tappet unit is preferably formed in one piece.

It is preferred if the tappets have at least one incision on the side opposite the pressure flange, so that on this side the tappet unit is partially split into at least two parts. As a result, these parts can be slightly pretensioned in the radial direction to the longitudinal axis of the plunger, projecting beyond the remaining region of the plunger. This means that the plunger must be inserted into the chambers against the pre-tension, so that the plunger can only be pulled out of the chambers by overcoming the pre-tension. This prevents the tappets from being pulled out or falling out unintentionally, so that the corresponding discharge system is particularly user-friendly.

It is further preferred if the discharge system has discharge pistons separate from the discharge plunger. As is known per se, the discharge pistons can be moved in the material discharge direction by the discharge plunger, so that the material stored in the chamber is discharged. However, when the discharge pistons are separate from the plungers, they do not follow a movement of the discharge plunger against the material discharge direction, so that no material that has already been discharged is drawn back into the chambers. It is preferred that the total internal volume of the chambers of the cartridge is <50 ml_, preferably <25 ml_, particularly preferably <10 ml_ and very particularly preferably <5 ml_, since the above-mentioned advantages of the invention and its preferred embodiments are most evident for such cartridges he will keep.

The plunger unit can have a color marking, for example an at least partial coloring, which is designed in the same color as an accessory, for example as a mixer and / or a sealing plug, or in another contrasting color to the cartridge, in order to provide an association to facilitate the cartridge with plunger unit with the accessories.

In one embodiment, the guide slot of the cartridge can be completely or partially covered by an adhesive label, which is designed, for example, with a scale and a transparent window. The adhesive label is, for example, film-like and can be provided with additional information about the contents of the cartridge.

The application system, in particular the cartridge, its outlet, the first and the second accessory part can be made of thermoplastic, in particular polypropylene, polyoxymethylene, polyethylene, polybutadiene, glass fiber or filler-reinforced thermoplastic, polyethylene terephthalate, cycloolefin copolymers, polycarbonate, polystyrene or common Copolymers, in particular ABS plastics or the like. It is particularly preferred if polypropylene or polybutylene terephthalate is used for the cartridge. In the event that the cartridge is made of polypropylene, the accessory, such as mixer or closure, is made of polyethylene or polyoxymethylene. For a harder cartridge made of polybutylene terephthalate, the accessories such as mixers or sealing plugs would be made of polyethylene or polypropylene, for example. If cartridge and accessory are combined, it is advantageous if, for example, a hard one Polypropylene with a soft polypropylene is used. A glass fiber reinforced polypropylene can also be combined with a non glass fiber reinforced polypropylene. For the sealing effect, it is relevant that at least the areas that come into contact with one another in a sealing manner consist of correspondingly well-sealing materials, for example hard / soft or soft / hard through plastic combinations. Thus, the inlet area of the mixer which can be connected to the outlets of the cartridge can consist of polyoxymethylene, while other areas of the mixer, for example the mixing element or the housing, can consist of a soft material, for example polypropylene.

The invention is explained in more detail below using exemplary embodiments and with reference to the drawings. All described and / or illustrated features form the subject matter of the invention for themselves, regardless of their summary in the claims or their references.

They show schematically:

FIG. 1 shows a perspective view of a cartridge according to the invention,

FIG. 2 shows a top view of the cartridge according to the invention,

FIG. 3 shows a longitudinal section of the cartridge according to the invention,

FIG. 4 shows a top view of the cartridge according to the invention rotated by 90 ° compared to FIG. 2,

FIG. 5 shows a view of the end of the cartridge according to the invention opposite the dispensing end, 6 shows one of the cartridges according to the invention along the line AA in FIG. 4,

7 shows one of the cartridges according to the invention along the line B-B in FIG. 4,

FIG. 8 shows an exploded view of a discharge system with a cartridge according to the invention according to a second embodiment,

FIG. 9 shows an exploded view of a discharge system with a cartridge according to the invention in accordance with a further embodiment,

FIG. 10 shows the discharge end of the cartridge according to FIG. 9 in a sectional view,

Figure 11 is a side view of the cartridge of Figure 9, and

Figure 12 is a sectional view of the cartridge of Figure 9 and an enlarged

Detail.

Figures 1 to 7 show a discharge system according to the invention according to a first embodiment with a cartridge 1, a plunger unit 2 and a closure 3. The cartridge 1 has a chamber 4, which is defined by a cylindri cal chamber wall 5 which at its dispensing end ( on the right in FIGS. 1 to 4) merges into an approximately cylindrical cross section 6 with an outlet opening 7. The end opposite the dispensing end (on the left in FIGS. 1 to 4) of the chamber 4 can be closed by a displaceable dispensing piston, not shown.

The chamber 4 is additionally surrounded by a casing 8 which is partially formed by the chamber wall 5 and partially surrounds the chamber wall 5. The casing 8 is integrally formed with the chamber wall 5. As can be seen in particular in FIGS. 1, 6 and 7, the casing 8 has an elliptical shape in cross section radially to the longitudinal axis L of the cartridge 1. In the illustrated embodiment, a guide slot 9 is formed on two opposite sides of the casing 8, which runs parallel to the longitudinal axis L. In the exemplary embodiment, the two guide slots 9 lie together with the chamber 4 on the main axis of the elliptical sheathing 8, whereas the length of the minor axis of the elliptical sheathing 8 is essentially defined by the diameter of the chamber wall 5.

In the example shown, the length of the main axis of the elliptical casing 8 is selected to be somewhat larger than the diameter of the cylindrical connection region 6. Deviating from this, the length of the main axis of the elliptical casing 8 in a preferred embodiment can also be equal to the diameter of the cylindrical connection region 6.

At the end of the cartridge 1 opposite the dispensing end, a latching hook 10 is formed with a projection projecting radially inwards. The latching hook 10 is laterally limited by incisions, so that it can be deflected radially outward against the elastic restoring force of the material of the cartridge 1. Deviating from the illustrated embodiment, it is also possible to provide a latching hook 10 on opposite sides.

The cartridge 1 also has a retaining collar 11, which in the embodiment shown is of rounded square design. The holding collar 11 extends radially outward from the casing 8 and serves to support ink 1 on two fingers. In a departure from the embodiment shown, two wing-like holding collars can also be formed on the upper or lower side of the casing 8 in FIG. 1.

The tappet unit 2 is formed in one piece as shown in Figure 3 and consists of a push rod 12, two indicator rods 13 and a pressure flange 14, via which the push rod 12 and the indicator rods 13 are connected to each other. The push rod 12 can be provided with a projection 15 for, if necessary, releasable connection with the discharge piston, not shown. The push rod 12 has in the embodiment shown in the figures be a cross-shaped cross section, which is dimensioned so that the push rod 12 is slidably received in the chamber 4.

The upper and lower legs in FIG. 4 of the pushrod 12, which is cross-shaped in cross section, are provided on the outside with locking notches 16 which cooperate with the locking hook 10. Due to the two opposite rows of locking notches 16, the plunger unit 2 can be inserted into the cartridge 1 in two positions rotated by 180 °, a row of locking notches 16 coming into engagement with the locking hook 10.

The latching hook 10 can also be deflected out against the elastic restoring force in such a way that the tappet unit 2 can be withdrawn by a latching notch 16 who can. This can be useful at the end of a dispensing process in order to relieve the pressure in the cartridge so that no material runs on.

The two indicator rods 13 are each in a guide slot 9 men. In the embodiment shown, the two indicator rods 13 protrude slightly radially from the respective guide slot 9 in order to be able to better recognize the position of the end of the respective indicator rod 13 pointing toward the dispensing end of the cartridge from the outside. Alternatively, it is also possible that the indicator rods 13 close flush with the casing 8. The indicator rods 13 can be provided with a marking, in particular for example a projection or a coloration, in particular at their end pointing towards the cartridge.

The closure 3 is detachably connected to the connection area 6 of the cartridge 1. In the illustrated embodiment, this is realized by a threaded connection with an external thread of the closure 3, which engages in an internal thread in the connection area 6. Alternatively, a bayonet connection between the closure 3 and the connection area 6 of the cartridge 1 is also possible. In the closed state of the cartridge 1 shown in FIGS. 1 to 4, a projection 17 of the closure 3 engages in the outlet opening 7 of the chamber 4 and closes it.

In the example shown, the cartridge is equipped with a tamper-evident closure, which can indicate the first use of the cartridge. For this purpose, a connecting element 18 is provided between the closure 3 and the cartridge 1, in particular the connection region 6 of the cartridge 1, which in the embodiment shown cannot be separated from the cartridge 1 and from the closure 3 without being destroyed. For example, the connecting element 18 can be welded to the cartridge 1 and can be integrally formed with the closure 3 via webs 19, which serve as a predetermined breaking point. If the closure 3 is removed from the cartridge 1, in particular screwed off, the webs 19 are severed so that the first opening of the cartridge 1 can be seen from the outside. The connecting element 18 remains on the cartridge 1 and can, for example, have a coding in the form of a colored configuration.

After the closure 3 has been removed, the cartridge 1 can be connected to an applicator (not shown), for example a dispensing spout. This can be done by means of the internal thread of the connection area 6. A material accommodated in the chamber 4 can be discharged from the cartridge 1 in a manner similar to a syringe, the latching hook 10, in cooperation with the latching notches 16, being able to be deployed in predefined do's. The fill level within the chamber 4 is also clearly visible through the position of the indicator rods 13, regardless of the plunger unit 2 protruding from the cartridge 1.

An alternative embodiment is shown in FIG. 8. Compared to the first embodiment, functionally identical components are provided with identical reference numerals in the second embodiment.

The cartridge 20 shown in FIG. 8 is designed as a double cartridge with two chambers 4 which are arranged parallel to one another and next to one another. Correspondingly, the casing 8 of the cartridge 20 is formed at the ends of the main axis of the elliptical casing 8 by the respective chamber walls 5, while the minor axis of the elliptical casing 8 lies between the two chambers 4. In the embodiment shown, the chambers 4 are disputed from one another, so that there is a space between them which prevents the migration of material between the chambers 4.

In the example shown, the cartridge 20 is provided with only one guide slot 9, which is positioned at one end of the minor axis of the elliptical casing 8. The guide slot 9 can be covered to the outside by a transparent film 21. The length of the main axis of the elliptical jacket 8 corresponds to the diameter of the cylindrical connection region 6 of the double cartridge 20. The transparent film 21 is preferably designed as an adhesive label with a scale and a transparent window. According to the design of the cartridge 20 as a double cartridge with two chambers 4, the plunger unit 22 is formed with two plunger rods 12 and a display rod 13. The indicator rod 13 has an elongated cross section and has on the lower side in Figure 8 locking notches 16 which cooperate with the locking hook 10 of the cartridge 20 as explained above for the first embodiment.

In FIG. 8, discharge pistons 23 are additionally shown, which close the chambers 4 on their side opposite the discharge end and can be displaced in the discharge direction by means of the push rods 12.

The cartridge 20 can be closed by a closure 24 on the discharge side. The connection between the closure 24 and the cartridge 20 takes place, as explained in relation to the first embodiment, by means of a threaded connection, wherein again a connecting element 18 with webs 19 serving as a predetermined breaking point can be provided between the closure 24 and the cartridge 20, so that the Closure 24 forms a tamper-evident closure. Additionally or alternatively, such a tamper-evident closure can also be provided between the cartridge and the plunger unit.

The closure 24 has two projections 17, which can each engage in outlet openings of the two chambers 4. In order to facilitate the alignment of the closure 24, in the embodiment shown in FIG. 8, a positional element 25 is provided on the closure 24, which protrudes counter to the dispensing direction and can engage in a corresponding opening in the connection region 6 of the cartridge 20. In addition, it is necessary for the closure 24 to be constructed in at least two parts, the positioning element 25 having the projections 17 before being rotatable relative to the area having the external thread. FIG. 8 also shows a mixer 26 which can be connected to the cartridge 20 when the closure 24 has been removed. For this purpose, the mixer 26 is also provided with an external thread which can be screwed into the internal thread of the connection area 6 of the cartridge. The mixer too

26 is designed with a positioning element 25 in order to facilitate the connection between the mixer 26 and the cartridge 20. The positioning element 25 can also serve as a coding if the cross-section of the positioning element 25 and the corresponding opening within the cartridge 20 are matched to one another such that only a specific positioning element 25 can be inserted into the opening of the cartridge 20.

Another embodiment with a double cartridge 20 is shown in FIGS. 9 to 12. The connection area 6 of this cartridge is made differently from the threaded connections for accessories shown in FIGS. 1 to 8 with a bayonet connection between the mixer 26 and the cartridge 20. For this purpose, two bayonet projections are on the housing of the mixer 26

27 and corresponding bayonet jaws 28 are formed on the ring of the connection area 6 of the cartridge.

To simplify production in injection molding, the ring of the connecting area 6 of the cartridge is provided with recesses 29, the exemptions bil to allow tools for shaping the bayonet jaws 28 to be easily fed and removed. Corresponding recesses can also be provided in the manufacture of the internal thread in the embodiments of FIGS. 1 to 8 in the annular connection area 6.

The hook-like projection 30 in FIG. 9 on the indicator rod 13 protrudes in the bringing-out direction via the push rods 12. If the discharge piston 23, not shown in FIG. 9, adjoins the push rods 12 or their projections 15 are provided, the free end of the jump located in the discharge direction 30 is flush with the end face of the discharge piston 23, which bears against the material to be brought. The projection thus shows the fill level in the cartridge 20 exactly.

The enlarged detail in FIG. 12 shows how the projection 30 can be connected to the pleated collar 11 via a predetermined breaking point in order to form a rear originality closure which can indicate the first use of the cartridge. In addition, this connection secures the ram unit against unintentional movement before it is used for the first time via a predetermined breaking point.

Reference list

1 cartridge 19 ridges

2 pusher unit 20 cartridge

3 Closure 21 transparent (adhesive) film

4 chamber or labeled label with

5 Chamber wall scaling and brand name

6 Connection area or logo

7 outlet opening 22 tappet unit

8 jacket 23 discharge piston

9 guide slot 24 closure

10 locking hooks 25 positioning element

1 1 collar 26 mixer

12 push rod 27 bayonet projection

13 display bar 28 bayonet jaw

14 pressure flange 29 recess

15 head start 30 head start

16 notch

17 projection L longitudinal axis

18 connecting element

Claims

Expectations

1. Cartridge, syringe or compule with at least one chamber (4), each having a tubular chamber wall (5), a connection area (6) arranged at a dispensing end for connecting the cartridge (1, 20), syringe or compule with an accessory part (26), wherein each chamber (4) has at least one outlet opening (7) which opens into the connection area (6), and with a tappet unit (2, 22), each of which has a tappet rod (12) for each chamber (4) for displacing a plunger (23) accommodated in the respective chamber (4), characterized in that the at least one chamber (4) is provided within a casing (8) encompassing the respective chamber wall (5) at least in regions and is integral therewith is formed, and that the casing (8) has at least one guide slot (9), in which an indicator rod (13), which is connected to the plunger unit, is slidably guided.

2. Cartridge, syringe or compule according to claim 1, characterized in that the plunger unit (2, 22) either with a cartridge (1), syringe or compule with a chamber (4) has a plunger rod (12) and two indicators (13 ) or in a cartridge (20), syringe or compule with two chambers (4) has two push rods (12) and an indicator rod (13).

3. cartridge, syringe or compule according to claim 1 or 2, characterized in that the casing (8) has at least one locking element (10) and that at least one push rod (12) and / or at least one indicator rod (13) at least one Has locking counter element (16).

4. A cartridge, syringe or compule according to claim 1, characterized in that the casing (8) is formed in sections by the at least one chamber wall (5) and in sections by an outer wall arranged radially outside the at least one chamber wall (5).

5. A cartridge, syringe or compule according to one of the preceding claims, characterized in that a free space is formed within the casing (8), in particular between the inside of the outer wall and the chamber wall (5) of the respective chamber (4) .

6. Cartridge, syringe or compule according to one of the preceding claims, characterized in that the radial cross section to the longitudinal axis of the casing (8) of the outer contour of the casing (8) is at least regionally elliptical.

7. cartridge, syringe or compule according to claim 6, characterized in that the outer wall of the casing (8) at its radial axis to the longitudinal axis of the casing (8) with the cylindrical outer wall of the connection region (6) is aligned.

8. Cartridge, syringe or compule according to one of the preceding claims with two chambers (4), characterized in that the chambers (4) are arranged next to one another and at a distance from one another.

9. Cartridge, syringe or compule according to one of the preceding claims, characterized in that the guide slot (9) is open to the outside.

10. Cartridge, syringe or compule according to one of the preceding claims, characterized in that the casing (8) is opaque in some areas and translucent or transparent in some areas, the guide slot (9) being provided in the translucent or transparent area of the casing (8) hen is.

11. Cartridge, syringe or compule according to one of the preceding claims, characterized in that the guide slot (9) is covered to the outside by a transparent film (21), which is preferably in the form of an adhesive label with a scale and a transparent window and / or a name, logo and / or reference is formed.