Nasal irrigation device

Abstract

Nasal irrigation device (10) with the following features: a. the nasal irrigation device (10) has a liquid reservoir (20), and b. The nasal irrigation device has a nasal applicator (40) designed for circumferential sealing insertion into a nostril of a user and which serves to dispense the liquid from the liquid reservoir (20) into a nostril of the user, and d. a dispensing opening (42) is provided on the nasal applicator (40), which is designed to dispense the liquid in the form of an unatomized liquid stream, e. in the nasal irrigation device (10), in particular in its liquid reservoir (20), a nasal irrigation fluid (12) is stored, wherein - the nasal irrigation device (10) is designed as a pediatric nasal irrigation device and is filled with a liquid volume of at least 20 ml or - the nasal irrigation device (10) is designed as an adult nasal irrigation device and is filled with a liquid volume of at least 30 ml, characterized by the following features: f. the nasal irrigation device (10) has a one-piece main body (14) which forms both the fluid reservoir (20) and the nasal applicator (40), and g. the main body (14) fully encloses the nasal irrigation fluid (12) in the delivery state, wherein the dispensing opening (42) is closed in the delivery state by a tool-free removable closure (50), which is also part of the one-piece main body (14).

Description

SCOPE OF APPLICATION AND STATE OF THE ART

[0001] The invention relates to a nasal irrigation device intended for the hygienic cleaning and care of the nasal cavities.

[0002] Nasal irrigation devices of this type are known from the prior art and have proven effective for removing mucus, pollen, dust, or other particles that can impair breathing. The use of such devices typically involves the user allowing fluid to flow from the device into one nostril at low pressure. The fluid fills the nasal cavity and exits through the other nostril. The nasal irrigation process usually takes place over a sink so that the fluid exiting the other nostril flows directly into the sink.

[0003] Nasal irrigation devices of this type comprise a fluid reservoir and a nasal applicator with a dispensing opening, which allows the delivery of a nasal irrigation solution as an unatomized stream into the nostril. The nasal applicator seals the nostril from the surrounding environment, preventing any fluid from escaping directly. Furthermore, in nasal irrigation devices of this type, the fluid reservoir and the nasal applicator are connected in such a way that they remain essentially in a fixed position relative to each other. This allows the user to guide the fluid reservoir with one hand and, through this, indirectly press the nasal applicator against the wall of the nostril to achieve the desired seal.

[0004] Nasal irrigation devices of the type described are available as disposable and refillable products. Common disposable products are comparatively expensive to manufacture. Reusable nasal irrigation devices carry the risk of contamination of the irrigation fluid before use.

[0005] Although numerous solutions already exist in the prior art, there is still room for improvement in nasal irrigation devices of this type. In particular, a simple and cost-effective design is desirable, one that allows for disposable products with low production costs and good recyclability. TASK AND SOLUTION

[0006] The object of the invention is to provide a nasal irrigation device that combines good usability with low manufacturing costs and good recyclability.

[0007] According to the invention, a nasal irrigation device is proposed which, in a manner typical of the type, has a liquid reservoir and a nasal applicator connected thereto.

[0008] The fluid reservoir contains a quantity of fluid typically sufficient for nasal irrigation. In particular, the nasal irrigation device can be offered in different sizes for children and adults. In the case of a nasal irrigation device for children, the fluid reservoir is preferably filled with a fluid volume of at least 20 ml, and more specifically between 20 ml and 50 ml. In the case of a nasal irrigation device for adults, the fluid volume is preferably at least 30 ml, and more specifically between 30 ml and 80 ml. The volume should, in principle, be selected so that it is at least as large as the typical volume of the nasal cavity of the respective target size, and in particular exceeds the average volume of the nasal cavity of the respective target size by at least 50%, so that during emptying, fluid is already exiting through the second nostril while fluid is still being supplied to the first nostril.It is considered particularly advantageous if at least 40 ml, and especially at least 50 ml, of nasal irrigation fluid is stored in the fluid reservoir.

[0009] Nasal irrigation fluid can be either a medical or hygienic solution. Nasal saline solutions, isotonic saline solutions, menthol solutions, and sage solutions are particularly suitable. Additionally, solutions with anti-inflammatory, soothing, or disinfectant agents can be used, such as chamomile extract, hyaluronic acid, eucalyptus oil, or antiseptic additives like chlorhexidine.

[0010] Furthermore, physiological saline solutions, preferably containing 0.9% NaCl, can be used, as well as hypertonic saline solutions with a higher NaCl content, for example, 3%. The latter are suitable for drawing water from tissues and thus exerting a decongestant effect. Enriched saline solutions, which contain additional ingredients besides NaCl such as zinc, selenium, dexpanthenol, or plant extracts like chamomile or aloe vera, offer additional benefits for the nasal mucosa. Antiviral preparations with ingredients such as carrageenan can also be used, as these bind viruses in the upper respiratory tract and thus prevent colonization of the mucosal cells and viral replication. Finally, preparations with a direct antiviral or disinfectant effect, such as nasal sprays based on povidone-iodine, are also an option.

[0011] It is generally preferred that the nasal irrigation fluid be preservative-free to ensure tolerability, especially for allergy sufferers or people with sensitive nasal mucosa. Provided a sterile filling process is ensured, the maintenance of sterility in a nasal irrigation device according to the invention is reliably guaranteed during storage by the complete encapsulation by the main body described below, thus eliminating the need for preservatives.

[0012] During use, the nasal applicator is inserted into one of the user's nostrils as intended before the delivery of liquid begins. The nasal applicator is designed to fit snugly against the wall of the nostril, preventing any liquid from leaking out of the nostril.

[0013] At the distal end of the nasal applicator, a dispensing port is provided for delivering an unatomized stream of fluid from the reservoir. This dispensing port is preferably relatively large to ensure an unobstructed flow of fluid. Designs with multiple dispensing ports are also possible in principle. However, a single dispensing port, ideally with low flow resistance, is preferred.

[0014] In particular, the nasal applicator preferably has a shape that tapers towards its end and the dispensing opening provided there, so that the user can insert the nasal applicator into the nostril until it fits snugly all the way around. Specifically, the nasal applicator can be designed with a conical contact section for contact with the user's nostril wall to ensure a good fit for different users. In the case of such a conical contact section on a nasal irrigation device for adults, the largest diameter point of the contact section preferably has an outer diameter of at least 15 mm. In a nasal irrigation device for children, the contact section preferably has an outer diameter of at least 8 mm, and in particular at least 10 mm, at its largest diameter point.

[0015] The nasal applicator and the fluid reservoir are preferably each designed as rigid or elastically deformable components and connected to each other in such a way that they can assume a substantially fixed relative position. Although the fluid reservoir is compressed as intended, depending on the design, it is sufficiently rigid to allow the nasal applicator to be guided and pressed tightly against the nose by means of the fluid reservoir.

[0016] The user can guide the nasal irrigation device by grasping the fluid reservoir and, by moving it, also guides the nasal applicator, which can then be inserted into the nostril. While the nasal irrigation fluid is flowing out of the outlet, the user can continuously press the nasal applicator against the nose to ensure a seal.

[0017] The nasal applicator can be directly adjacent to the fluid reservoir, or it can be connected to the fluid reservoir by means of a connector. Such a connector may, in particular, have a bend that directs the nasal applicator in a direction suitable for fluid delivery, even though the proximal end of the connector is attached to the fluid reservoir in a different direction.

[0018] The connecting piece does not need to define a completely fixed relative position of the nasal applicator with respect to the fluid reservoir. It is also possible to design the connecting piece in which it can be moved into different positions relative to the fluid reservoir, which are then automatically maintained. This can be achieved, for example, with a connecting piece designed section by section as a stable bellows. However, a design is particularly preferred in which such mobility is not possible and the fluid reservoir and the nasal applicator always remain in a fixed relative position to each other.

[0019] The nasal irrigation device proposed according to the invention is characterized by a one-piece main body that includes both the fluid reservoir and the nasal applicator. In particular, it is a one-piece main body made of plastic.

[0020] Such a one-piece design of the main body and the nasal applicator means that the main body and the nasal applicator, as well as any connecting piece, are directly bonded together. Preferably, the basic shape of the main body is produced by blow molding, i.e., by pressurizing a blank within a mold, causing it to conform to a surrounding shaping wall.

[0021] In its delivered state, the main body not only encloses the nasal irrigation fluid in the fluid reservoir and in the nasal applicator, but it also forms a tool-free removable closure that closes the dispensing opening in its delivered state and is also part of the one-piece main body.

[0022] Basically, two types of nasal irrigation devices according to the invention are possible: nasal irrigation devices in which, when correctly positioned and prepared, the liquid flows into the user's nose by gravity, and nasal irrigation devices in which the liquid in the reservoir is pressurized and flows towards the dispensing opening, either by force or with the aid of manually applied pressure, and is dispensed from there. In particular, the reservoir can be provided with a wall thickness that allows it to be compressed in the form of an elastically deformable squeeze bottle.

[0023] In a design where the nasal irrigation fluid is dispensed by gravity, it is considered advantageous for the nasal irrigation device to have an air inlet in addition to the dispensing opening, so that air can flow into the fluid reservoir during dispensing. While the dispensing opening is located at a low point or the lowest point of the fluid reservoir, the air inlet is positioned opposite it, preferably at the highest point of the nasal irrigation device in its intended position of use.

[0024] Preferably, the aforementioned air inlet opening, as well as the discharge opening, is closed in the delivery state by a second closure that can be removed without tools and is also part of the one-piece main body.

[0025] The first closure at the dispensing port and, if applicable, the second closure at the air inlet port are designed for tool-free opening. This usually means that the respective openings can be opened by the user without any additional tool not included with the nasal irrigation device. Opening the closure results in the separation of the main body material along a dividing edge surrounding the closure. In particular, an adult user should be able to open at least one closure with their fingers, even if they do not possess significant strength. The closure may be designed to be rotated to release the dispensing port and preferably also the air inlet port. Alternatively, it could be a tear-off tab, made of the same material as the rest of the main body and securely attached to the respective opening.

[0026] Preferably, each closure has a handle section, and this handle section allows the closure to be detached without tools by moving it relative to the fluid reservoir or nasal applicator. The handle section preferably has gripping surfaces large enough to be grasped by an adult. In particular, the handle section can be in the form of a thin plastic plate or a plastic bridge, the plate or bridge preferably intersecting the central delivery direction or the central inflow direction, so that the closure can be rotated around this axis by means of the plate or bridge, thereby separating the closure from the main body.In the case of a tear-off solution, the handle section preferably forms a tab which, when force is applied in a defined direction, allows a secure circumferential separation of the closure from the opening.

[0027] The closures can be discarded after opening unless they are designed to remain permanently attached to the main body by means of a retaining clip. Nasal irrigation devices of the type according to the invention are not typically intended for reuse, so the closures are no longer needed after opening. However, designs are conceivable and encompassed by the invention in which at least one closure is designed as a reusable closure. In particular, the closure can be designed such that, in the delivered state, it is an integral part of the main body, closing the corresponding opening, and after being detached and thus after the opening has been opened, it can be reattached in a different orientation to close the opening again, for example, by screwing an internal thread provided on the closure onto an external thread of the nasal applicator.

[0028] When the caps are removed, sections of the wall at the dispensing or air inlet opening are intentionally separated, resulting in a destructive break. This can lead to sharp edges at the break point, which can be bothersome in both cases. In the case of the dispensing opening, the sharp edge can injure the nose. In the case of the air inlet opening, the sharp edge can cause pain on the fingers if the air inlet is intermittently covered during use.

[0029] It can therefore be advantageous if the first closure of the dispensing opening and / or the second closure of the air inlet opening are designed such that the dividing edge on the main body, which remains after removal of the closure, is surrounded by a protective rim. This means that the intended tear line is recessed relative to this protective rim. In the case of the dispensing opening, the protective rim is preferably spaced between 0.5 mm and 2 mm from the central axis of the dispensing opening. In the case of the air inlet opening, the protective rim is preferably spaced between 3 mm and 12 mm from the central axis of the air inlet opening.

[0030] In the case of the air inlet opening, this protective edge preferably also provides a seal on the user's finger when the inflow of air - and thus indirectly the outflow of liquid - is interrupted in phases by pressing the air inlet opening closed.

[0031] The main body surrounding the fluid reservoir and forming the nasal applicator is preferably designed as a single plastic body. In particular, this plastic body may have a surrounding wall with a wall thickness between 0.3 mm and 1.0 mm. If the fluid reservoir forms an elastically deformable compression section that is compressed to dispense the fluid, the wall thickness, at least in the compression section, is preferably between 0.3 mm and 0.8 mm, and more specifically between 0.3 mm and 0.6 mm. If the fluid reservoir is not compressed, but rather the fluid is dispensed by gravity while air can flow in through an air inlet, a greater wall thickness of the fluid reservoir is preferred, preferably between 0.6 mm and 1.0 mm.

[0032] Blow molding of plastics is used as a manufacturing technique for the main body. Blow molding is a manufacturing process in which a plastic blank is blown into an outer mold using compressed air to produce hollow bodies such as the main body required here. This gives the main body its basic shape, with a separate thermal forming process preferably used after blow molding to form the at least one closure.

[0033] Since adjusting the wall thickness section by section is quite complex during blow molding, it is considered preferable for the walls of the main body to have a uniform thickness, except in the closure areas. This means that the wall thickness varies by no more than 20%. However, it can be advantageous to provide variable wall thicknesses, possibly even with variations exceeding the aforementioned 20%, in order to give the one-piece main body a distinctive design in certain areas, while allowing for greater flexibility in the area of ​​a compression section.

[0034] In a nasal irrigation device according to the invention, the main body is preferably made of plastic. Polyethylene, polypropylene, cycloolefin copolymers, polyethylene terephthalate, ethyl vinyl alcohol, polyvinyl chloride, and polypropylene copolymers have proven to be suitable materials. Polyethylene (PE) is well-suited because it is lightweight, chemically resistant, and flexible. Polypropylene (PP) offers excellent heat resistance and strength, which is particularly advantageous for sterilizable nasal irrigation devices. Cycloolefin copolymers (COC) are valued for their high transparency and excellent moisture barrier properties, which improves shelf life and allows for visual inspection of the contents. Polyethylene terephthalate (PET) is particularly useful when high stability is required, especially in the case of nasal irrigation devices with an air inlet that are not intended to be compressed.It exhibits high strength and stability, allowing nasal irrigation devices to be designed to be both lightweight and shatterproof. Ethyl vinyl alcohol (EVOH) is characterized by its exceptional gas barrier properties, effectively protecting the nasal irrigation solution from oxygen ingress and thus extending its shelf life. Polyvinyl chloride (PVC) offers good chemical resistance and is easy to process, making it suitable for the main bodies of nasal irrigation devices with more complex shapes. Polypropylene copolymers (PP-C) combine flexibility with strength, enabling nasal irrigation devices that are both durable and comfortable to use.

[0035] It may also be useful if the main body is completely or partially transparent in order to make the amount of liquid remaining in the main body visible to the user.

[0036] It is still considered preferable if the fluid reservoir, and thus the corresponding section of the main body, has a cylindrical shape, in particular a circular cylindrical shape. Such a shape allows for a comparatively small device despite a large fluid reservoir. The production of partially cylindrical bodies is also advantageous when plastic blow molding is chosen as the manufacturing technique, which is the recommended manufacturing technique for the main body in this case.

[0037] In the case of a cylindrical, and especially a circular cylindrical, fluid reservoir section of the main body, it is advantageous if the air inlet opening is provided at an upper end of the fluid reservoir, particularly aligned with a central axis of the basic shape. Conversely, the nasal applicator or the connecting piece leading to the nasal applicator is preferably provided at a lower end of the fluid reservoir, particularly also aligned with a central axis in this case.

[0038] In the case of a liquid storage unit formed by a circular cylindrical section of the main body, it is considered preferred if the circular cylindrical basic shape in the area of ​​the liquid storage unit is provided with an outer diameter between 20 mm and 60 mm, preferably with an outer diameter between 25 mm and 40 mm.

[0039] It can be advantageous to deviate from the circular cylindrical shape to facilitate handling. In particular, it can be beneficial to choose a different shape for the fluid reservoir, allowing the user to estimate the orientation of the nasal applicator and thus insert it into a nostril without having to look closely. One way to achieve this is with a fluid reservoir with an elliptical cross-section.

[0040] Another preferred design provides that the liquid reservoir has, at least in sections, a cross-section with non-parallel planar wall sections, in particular a substantially triangular, square, pentagonal, or hexagonal cross-section. These shapes have also proven to be tactilely pleasing and practical for the operator. In particular, a square cross-section is conceivable, which allows for a comparatively small outer packaging relative to the amount of liquid in the reservoir.

[0041] If the nasal irrigation device is primarily intended for children, it can be advantageous to choose a design that is aesthetically pleasing to children. In particular, the nasal irrigation device, or its main body, can have the stylized shape of an animal, with the mouth or trunk of the stylized animal forming the nasal applicator. Designs of the main body as a stylized fish, dolphin, or elephant are particularly suitable for the use described here.

[0042] It can also be advantageous to give the main body a flat shape in the area of ​​the fluid reservoir. In particular, the fluid reservoir can have, at least in sections, a flat cross-section that, in a long direction, has an extent at least 1.5 times greater than in a short direction. For example, the cross-section can have an elliptical shape.

[0043] As already described, one of the possible designs of a nasal irrigation device according to the invention relates to a design in which the liquid reservoir is compressed as intended in order to reduce the internal volume and push the liquid towards the dispensing opening.

[0044] Several measures are advantageous for this design, such as the adapted wall thicknesses mentioned above. In particular, the fluid reservoir can be designed, at least in sections, with a bellows section that facilitates the reduction of the internal volume. A bellows section in this sense is characterized by a sequence of wave or fold shapes in the wall, which facilitate compression but exhibit a lower tendency to spring back than walls without waves or folds. Since rapid springback is not usually required in a nasal irrigation device according to the invention, the advantage of the very easy compression resulting from the bellows shape is particularly relevant. This ease of compression allows for especially precise dosing.

[0045] Another advantageous design, particularly suitable when the fluid reservoir has a squeeze section, is provided when the fluid reservoir has two opposing actuating wall sections for manual force application. Here, the user places their fingers on these sections to reduce the size of the fluid reservoir. The actuating wall sections are sufficiently large for this purpose. In particular, at least one of the actuating wall sections may be provided with a recessed gripping surface or one with textured grips to simplify handling.

[0046] As already explained at the outset, a nasal irrigation device according to the invention preferably has a connecting piece that connects the fluid reservoir and the nasal applicator. This connecting piece does not need to be set off in a separate manner, but can be a single pipe section between the fluid reservoir and the nasal applicator, which transitions into the nasal applicator without a step.

[0047] The connector and the adjoining nasal applicator can extend in the direction of the central axis of the fluid reservoir. Preferably, however, the connector and the nasal applicator deviate from this orientation to allow for more convenient handling.

[0048] A connecting piece of the aforementioned type can also serve the purpose of adapting the orientation of the nasal applicator to the desired handling of the nasal irrigation device, in particular by causing the connecting piece to angle the nasal applicator towards the fluid reservoir, preferably with an angle between 60° and 120° between a central axis of the circular cylindrical basic shape and the discharge direction defined by the discharge opening.

[0049] The connector preferably has an outer diameter that is equal to or greater than the largest outer diameter of the nasal applicator. This means that the shape of the connector and the nasal applicator tapers towards the distal end, which can simplify manufacturing.

[0050] In particular, the connecting piece can be designed to have an outer diameter that is smaller than the largest outer diameter of the nasal applicator. Specifically, the nasal applicator can have its largest diameter in the area of ​​the previously described conical contact surface, with the connecting piece adjoining it towards the fluid reservoir having a smaller outer diameter in comparison.

[0051] As already described, the nasal irrigation device described is preferably manufactured using blow molding. In particular, an integrated process is advantageous in which the main body is first produced using blow molding, and the sterility ensured by this manufacturing method is then used to immediately introduce liquid into the main body and subsequently close one of the closures. In the case of a design with two closures, a first closure is preferably already formed and the corresponding opening closed when the nasal irrigation fluid is introduced into the main body.

[0052] Ideally, the internal volume of the main body should be utilized efficiently. Therefore, it is advantageous for the main body, including the internal volume of the connector and nasal applicator, to be filled with nasal irrigation fluid to at least 50%, preferably at least 60%. However, it is also desirable for a residual volume to remain after filling the main body and closing the caps, which is not filled with fluid. This residual volume facilitates handling—for example, by preventing fluid from escaping immediately after opening the caps. Overall, it is preferred that the internal volume of the main body be filled with nasal irrigation fluid to a maximum of 90%, preferably to a maximum of 75%.

[0053] When designing a nasal irrigation device where the fluid is not forced out by a reduction in the fluid reservoir's volume, but rather dispensed through the dispensing opening by gravity while air flows in, care must be taken to ensure that the main body and the nasal applicator are designed to guarantee a sufficient fluid flow for dispensing. To achieve this, the main body and the nasal applicator must first be designed so that the fluid reservoir is positioned above the dispensing opening during dispensing. Preferably, the fluid level before dispensing should be at least 80 mm above the dispensing opening, and preferably at least 100 mm above it, when the nasal applicator is positioned low. At the same time, the dispensing opening and the inlet to the dispensing opening should preferably be designed to create minimal flow resistance.The dispensing opening preferably has a clear passage area of ​​at least 3 mm. 2 on, in particular preferably of at least 6 mm 2 or at least 10 mm 2 Preferably, the cross-section of a liquid channel from the liquid reservoir to the dispensing opening also has a minimum clear cross-section of at least 3 mm. 2 provided, in particular preferably with at least 6 mm 2 or at least 10 mm 2 .

[0054] The invention relates not only to the nasal irrigation device itself but also to a method for its manufacture. A method comprising the following steps is proposed: First, the main body of the nasal irrigation device, which forms both the fluid reservoir and the nasal applicator, is molded as a single unit in a mold cavity, initially leaving at least one opening in the main body. This is preferably done by extruding a tubular blank from the molten plastic. This tube is inserted into the mold cavity and inflated with compressed air, resulting in a shape of the plastic part corresponding to the mold cavity (blow molding).

[0055] After the main body is formed, which is sterile due to the temperatures used during manufacturing, the nasal irrigation fluid, also in a sterile state, is poured through the opening into the fluid reservoir of the main body without the main body leaving the sterile environment. As explained above, the main body is preferably filled with fluid to at least 50%, and more specifically to at least 60%. The fill level can also be higher. However, it should preferably not exceed 95%, and more preferably not exceed 85%, to avoid making it difficult to close the main body.

[0056] Once filling is complete, the opening is closed. The main body is sealed in the area of ​​the opening using the same material as the main body. This is done primarily through a thermal and mechanical seal. Preferably, a sealing cavity is used to create the shape of the manually removable closure, which can be removed without tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Further advantages and aspects of the invention will become apparent from the claims and from the following description of preferred embodiments of the invention, which are explained below with reference to the figures. Fig. Figures 1A to 1C show a first embodiment of a nasal irrigation device. Fig. 2A to 2D illustrate the commissioning and use of the nasal irrigation device. Fig. 1A to 1C. Fig. Figures 3A to 3C show a second embodiment of a nasal irrigation device. Fig. 4A to 4D illustrate the commissioning and use of the nasal irrigation device. Fig. 2A to 2C. Fig. Figures 5A to 5C show a third embodiment of a nasal irrigation device. Fig. Figures 6A to 6D show a fourth embodiment of a nasal irrigation device. Fig. Figures 7A to 7C show a fifth embodiment of a nasal irrigation device. Fig. Figures 8 to 10 illustrate possible variations in the cross-section of the fluid reservoir of the nasal irrigation device. Fig. Figures 11A to 11C show a sixth embodiment of a nasal irrigation device. Fig. Figures 12 to 14 show further examples of a nasal irrigation device. Fig. 15A and Fig. Figure 15B shows another embodiment of a nasal irrigation device, in this case with a reusable closure. Fig. Figures 16A to 16I illustrate the manufacture of the nasal irrigation device. Fig. 1A to 1C. DETAILED DESCRIPTION OF THE EXECUTION EXAMPLES

[0058] Fig. Figures 1A to 1C show a first embodiment of a nasal irrigation device 10 according to the invention. Fig. 1A The nasal irrigation device 10 from the outside in its delivered state. Fig. 1B and Fig. Figure 1C shows a longitudinal section and a cross-section through the nasal irrigation device 10.

[0059] The nasal irrigation device 10 has a very simple design. It consists of a main body 14 made of plastic, which forms various parts of the nasal irrigation device 10, namely, in particular, the walls of a fluid reservoir 20, a nasal applicator 40, and a connecting piece 30 between them. Furthermore, in its delivered state, the main body 14 also forms a closure 50, by means of which a dispensing opening 42 on the nasal applicator 40 is closed in its delivered state.

[0060] With the exception of the closure 50, the main body 14 has a rotationally symmetrical design. The fluid reservoir 20 has a circular cylindrical shape and is bounded at its upper end by an outwardly convex wall. The connecting piece 30 is attached to the lower end of the fluid reservoir 20, extending along the central axis 2 and carrying the nasal applicator 40 at its distal end. In other designs, and preferably, the connecting piece 30 is provided with a bend or a kink, as will be explained further below.

[0061] The internal volume of the main body 14 is 60 milliliters, with the internal volume of the fluid reservoir 20 comprising more than 90% of the internal volume of the main body 14. As can be seen from Fig. As can be seen in Figure 1B, approximately 60% of the internal volume of the main body 14 is filled by the liquid. The total volume of the nasal irrigation fluid 12 is approximately 40 milliliters. The total volume must be such that the user's nasal cavity can be completely filled with this amount of liquid once.

[0062] In its delivered state, an interior compartment 16 of the main body 14 is completely and integrally enclosed by the main body 14, thus ensuring the sterility of the liquid within the main body 14 until it is opened. The nasal irrigation fluid 12 is therefore stored sterile in the liquid reservoir 20.

[0063] The nasal applicator 40 is designed to be inserted into a user's nostril after activation by removing the closure 50, thereby completely sealing it. For this purpose, the nasal applicator 40 has an approximately conical or otherwise tapered shape towards its distal end, forming a contact section 44. This section is capable of sealing nostrils of varying diameters. In this case, the outer diameter of the nasal applicator 40 at its largest point is approximately 1.5 cm. Due to its tapered shape, the nasal applicator 40 can be used with nostril diameters between 0.8 mm and 1.5 mm.

[0064] The Fig. 2A and Fig. Figure 2B illustrates the commissioning and use of the nasal irrigation device 10 by the user. As in Fig. As illustrated in Figure 2A, the user first twists off the closure 50 as intended. For this purpose, the closure 50 has a flat, and therefore easily gripped, handle section 52, which is twisted relative to the rest of the main body 14. This separates the closure 50 from the nasal applicator 40 and thus opens the delivery opening 42.

[0065] The Fig. 2C and Fig. 2D illustrates the design of the closure 50. The closure 50 is attached to the nasal applicator 40 via a circumferential material bridge 54, which forms the separating edge for detaching the closure 50 and is set back from a protective rim 56. Fig. Figure 2D shows the state after the closure has been separated. A burr 57 remains from the separation. However, this is recessed relative to the protective edge 56, so there is no risk of the burr 57 coming into direct and painful contact with the nasal skin.

[0066] Once the nasal irrigation device 10 is ready for use after removing the cap 50, it is used. This is usually done over a sink. The user turns their head so that the nasal applicator 40 extends into one of their nostrils and seals it completely. There is no risk of the liquid leaking out during insertion, as the openings are designed so that air cannot escape through the dispensing opening 42 during this phase.

[0067] This only happens once the liquid storage tank 20 is pressurized, as described in Fig. Figure 2B illustrates this with the arrows pointing towards the fluid reservoir 20. The walls of the main body 14 in the area of ​​the fluid reservoir 20 allow for easy elastic compression, as indicated by the arrows, whereby the fluid 12 can be metered and dispensed into the nostril. The fluid flows into the user's nasal cavities and fills them, before typically exiting through the other nostril.

[0068] Typically, all the liquid is expelled during one use, possibly with the user switching nostrils in between.

[0069] The Fig. Figures 3A to 3C show a second type of nasal irrigation device 10. The essential difference to the first type is that the nasal irrigation device 10 of Fig. 3A to 3C has two openings 42, 22, each of which is in the delivery state. Fig. 3A to 3C are closed by closures 50, 60.

[0070] In accordance with the design of the Fig. 1A to 2D, one of the openings is the delivery opening 42 on the nasal applicator 40, which is closed by means of the closure 50.

[0071] The other opening is an air inlet opening 22, which is provided at the opposite end of the nasal irrigation device 10, in this case on the curved wall that closes off the liquid reservoir 20 opposite the dispensing opening 42. This air inlet opening 22 is closed by the closure 60, which also has a flat handle section 62 by means of which the closure 60 can be unscrewed.

[0072] The air inlet opening 22 is designed to allow air to flow into the liquid reservoir 20 during the dispensing of liquid. Deviating from the design of the Fig. In configurations 1A to 2D, therefore, no compression of the liquid reservoir 20 is required during use. Instead, with openings 22 and 42 open, the liquid flows out of the liquid reservoir 20 through the dispensing opening 42 due to gravity. In this configuration, the connecting piece 30 is initially as shown in Fig. Figure 1A shows the fluid pathways. However, it may be useful to further design the fluid pathways for gravity-fed discharge, especially in the area shown in the diagram. Fig. 14 illustrated ways.

[0073] To put the nasal irrigation device 10 into operation Fig. 3A to 3C, the closure 60 of the air inlet opening 22 is first turned off, as shown in Fig. 4A illustrates this. Because the dispensing opening 42 is still closed, this does not yet result in the dispensing of liquid.

[0074] First, the opened air inlet opening 22 is closed again, this time by means of a user's finger, as Fig. Figure 4B shows. To prevent the user from coming into contact with a burr 65 remaining after the separation of the closure 60, the air inlet opening 22 is also surrounded by a protective rim 56 that encircles and extends beyond the separating edge.

[0075] With the air inlet opening 22 manually closed, the second closure 50 of the discharge opening 42 is now separated, as shown in Fig. 4B illustrates this. This does not yet lead to liquid discharge, as shown. Fig. 4C indicates that no air can flow in. The user can therefore now assume the intended position over a sink and only then lift their finger from the air inlet opening 22.

[0076] Now, in the Fig. Figure 4D illustrates how liquid flows out through the dispensing opening 42 into the user's nostril, while air flows in through the air inlet opening 22. The arrows in Fig. 4D illustrates the flow of air.

[0077] The Fig. Figures 5A to 5C show a further variation of a nasal irrigation device 10. This is similar to the first embodiment. Fig. 1A to 2D are designed with only one dispensing opening 42 and without an air inlet opening 22. The liquid reservoir 20 is designed, according to the first embodiment, as a squeeze liquid reservoir 20, which is compressed for the purpose of dispensing. However, in the nasal irrigation device 10, the Fig. 5A to 5C shall additionally be provided with an air inlet opening 22 which is closed with a closure in the delivery state.

[0078] The unique feature of the design of the Fig. 5A to 5C lies in the cross-sectional shape as shown from Fig. 5C is evident. The main body 14 is designed with a flattened cross-section, preferably an elliptical cross-section, at least in the area of ​​the fluid reservoir 20. This facilitates handling, as a non-circular cross-section is easier to grasp and guide. In addition, in the exemplary embodiment of the Fig. 5A to 5C a recess 17 is provided in a front wall of the liquid reservoir 20 to facilitate the compression of the liquid reservoir 20 and to counteract slippage.

[0079] The design of the nasal irrigation device 10 of the Fig. 6A to 6C is again a design with only one delivery opening 42 on the nasal applicator 40. As with the design of the Fig. 1A to 2D also provides that after opening the dispensing opening 42 by separating the closure 50, the discharge takes place by compressing the liquid reservoir 20.

[0080] The special feature in the design of the Fig. 6A to 6C lies in the fact that the fluid storage unit 20 has a fluid storage capacity that can be reduced in volume by buckling deformation along predetermined buckling points or bending deformation along predetermined bending points. As can be seen in particular from the sectional view of the Fig. The fluid reservoir 20, which can be extracted from 6C, has two side walls 20A and its upper surface 20B exhibiting a folded structure that allows the fluid reservoir 20 to be compressed with only minimal force. After discharge, an elastic recovery may occur, but this is not strictly necessary.

[0081] The bellows-like design of the fluid reservoir 20 facilitates the correct dosage of the nasal irrigation fluid 12, as the actuation force required is low. It also promotes a space-saving configuration of the nasal irrigation device 10 for disposal.

[0082] The design of the Fig. 7A to 7C, in turn, resemble the design of the Fig. 3A to 4D. Here too, the nasal irrigation device 10 is provided with an air inlet opening 22 and a dispensing opening 42, which are fitted with closures 50, 60 and which, after removal of the closures, allow the liquid to flow out by gravity. However, even with this design, a construction with only one dispensing opening 42 and intended use by compressing the liquid reservoir 20 would be possible.

[0083] The unique feature of the design of the Fig. 7A to 7C lies in particular in the triangular cross-sectional shape that the nasal irrigation device 10 has on the fluid reservoir 20, as shown in particular by Fig. As can be seen in Figure 7C. Such polygonal designs, especially with rounded corners, have proven particularly advantageous in the handling of nasal irrigation devices. Compared to circular cylindrical fluid reservoirs 20, they improve the user's ability to correctly align the nasal irrigation device 10. This can be a significant advantage, especially in designs with a nasal applicator 40 that is not aligned with the fluid reservoir 20.

[0084] The triangular design of the Fig. 7C is not the only option. Square, pentagonal, and hexagonal designs of the main body 14, particularly in the area of ​​the fluid reservoir, have also proven effective. The corresponding cross-sections are shown in the Fig. 8 to 10 are shown.

[0085] The designs presented so far had in common that the nasal applicator 40 was aligned parallel to the direction of the central axis 2 of the fluid reservoir 20. Such a design can be advantageous because it facilitates the production of the main body 14 using the blow molding process.

[0086] However, it is considered advantageous in use if the orientation of the nasal applicator 40, defined in particular by the direction of discharge of liquid through the dispensing opening 42, forms an angle with the central axis 2 of the liquid reservoir 20. Such a design with an angled nasal applicator 40 is particularly advantageous in configurations with an air inlet opening 22, which must be positioned above the dispensing opening 42 for the purpose of dispensing liquid.

[0087] The design of the Fig. Figures 11A to 11C represent a nasal irrigation device 10, which has been specially developed for children. This is reflected in a comparatively small volume of 25 ml of nasal irrigation fluid in the fluid reservoir 20, as well as a shape of the nasal applicator 40 that is dimensioned for the size of children's nostrils. The one-piece construction of the main body 14 of the nasal irrigation device 10 and the one-piece molding of the closure 50 are the same in this design as in the preceding embodiments.

[0088] The most striking feature of the design of the Fig. Figures 11A to 11C describe the design of the nasal irrigation device 10 as resembling an animal, in this case a dolphin. Such a design, appealing to children, increases their acceptance of nasal irrigation procedures.

[0089] In a design like the Fig. Due to the curved shape, there is no defined central axis of the fluid reservoir 20 in 11A to 11C. Nevertheless, this curved shape, whether animal-shaped or not, is advantageous for handling. According to the orientation of the Fig. 11C allows the donor to be held during delivery so that the child does not have to assume an unnatural head position and the fluid is still positioned predominantly above the delivery opening 42.

[0090] Fig. Figure 12 shows a design in which the nasal applicator 40 is angled by approximately 60° relative to the central axis 2 of the fluid reservoir 20. Fig. Figure 13 shows a design in which the angle corresponds to approximately 100°. Although most of the aforementioned embodiments are equipped with a nasal applicator 40 pointing directly downwards, a design with a nasal applicator 40 angled relative to the central axis is more convenient in practice. In all the aforementioned designs of the Fig. For 1A to 10, such an angled configuration is considered preferred.

[0091] The designs described so far feature a tapered connecting piece 30. This tapered section can act as a restrictor during discharge and can be selected to create a comfortable sensation for most users as the fluid flows into the nasal cavity. The restrictor action prevents an excessively high fluid flow. Since users find an excessively high fluid flow very unpleasant, this restrictor effect is particularly helpful. This is especially true for nasal irrigation devices 10 where discharge is achieved by manually pressurizing the fluid reservoir 20.

[0092] Fig. Figure 14 shows an alternative design in which no diameter step is provided between the connecting piece 30 and the nasal applicator 40. The connecting piece 30 thus has a large clear cross-section, resulting in only a minimal throttling effect in the area of ​​the connecting piece 30. Such a reduction in the throttling effect of a connecting piece 30 that tapers relative to the nasal applicator 40 can be particularly advantageous if the user can precisely control the liquid output via the air inlet opening 22. In such a case, it is desirable that the already low pressure in the liquid, due to gravity-driven discharge, is not further reduced by the throttling effect of a connecting piece 30.

[0093] The Fig. 15A and Fig. Figure 15B shows another design of a nasal irrigation device 10. The special feature of this design is its reusability. Although the focus of the nasal irrigation devices 10 proposed here is on single use, i.e., disposal of the nasal irrigation device 10 after a single use, designs are also conceivable that allow reuse by enabling the closure 50 on the dispensing opening 42 to be reattached to the nasal applicator 40 after separation.

[0094] In the case of the design of the Fig. 15A and Fig. 15B stipulates that the connecting piece 30 has an external thread. Correspondingly, the closure 50 is designed differently from the previously described variants, namely with a cap shape with an internal thread, which is present in the delivered state. Fig. 15A points outwards.

[0095] When the cap 50 is separated from the nasal applicator 40, the delivery opening 42 is opened as described above. Additionally, it is possible to turn the removed cap 50 over and then screw it onto the external thread mentioned above to close the delivery opening 42 again.

[0096] The Fig. Figures 16A to 161 illustrate a preferred manufacturing process for producing a nasal irrigation device 10 according to the invention, in this case, by way of example, the nasal irrigation device of the Fig. 3A to 4D.

[0097] The manufacturing method proposed here uses a process called blow molding.

[0098] As in Fig. As shown in Figure 16A, the starting point is a tubular blank 13 produced by extrusion. This blank 13 is inserted into a mold cavity consisting of two sub-molds 110A, 110B, and the previously heated sub-molds are placed in the Fig. 16B illustrated how they moved towards each other, already forming a neck of the nasal irrigation device 10 and the closure 60 at the air inlet opening 22.

[0099] Then, as in Fig. As shown in Figure 16C, a compressed air nozzle 114 is moved to the still open end of the partially formed blank 13, so that it is flush with the still unformed upper end of the blank 13. Compressed air is then introduced, which pressurizes the interior of the blank 13, causing the walls to conform to the partial forms 110A, 110B. As shown in Fig. As can be seen in 16D, the liquid storage unit 20 already takes its shape as a result.

[0100] This is followed, as shown in Fig. 16E, the filling process, whereby the partially formed blank 13 is still arranged in the partial molds 110A, 110B at this point. However, a process is also conceivable in which the partially formed blank 13 has already been removed from the partial molds 110A, 110B before the manufacturing process continues with the filling.

[0101] For filling with nasal irrigation fluid 12, a fluid nozzle 116 is placed above the opening of the partially formed blank 13 and the sterile fluid is dispensed here, so that it enters the fluid reservoir 20.

[0102] Once the filling with nasal irrigation fluid 12 is complete, as shown in Figure 16E, the blank 13 or the main body 14 is closed in the area of ​​the remaining opening. For this purpose, two sealing forms 111A, 111B are provided, which are moved up to the neck of the partially formed blank 13 and thereby form both the nasal applicator 40 and the closure 50 provided here. Fig. 16F and Fig. 16G illustrates this.

[0103] Then, molds 110A and 110B are opened as shown in Fig. Figure 16H shows the almost finished nasal irrigation device 10, which can then be removed. Only excess plastic needs to be removed to restore it to its delivered condition. Fig. to produce 16I.

Claims

[1] Nasal irrigation device (10) with the following features: a. the nasal irrigation device (10) has a liquid reservoir (20), and b. The nasal irrigation device has a nasal applicator (40) designed for circumferential sealing insertion into a nostril of a user and which serves to dispense the liquid from the liquid reservoir (20) into a nostril of the user, and d. a dispensing opening (42) is provided on the nasal applicator (40), which is designed to dispense the liquid in the form of an unatomized liquid stream, e. in the nasal irrigation device (10), in particular in its liquid reservoir (20), a nasal irrigation fluid (12) is stored, wherein - the nasal irrigation device (10) is designed as a pediatric nasal irrigation device and is filled with a liquid volume of at least 20 ml or - the nasal irrigation device (10) is designed as an adult nasal irrigation device and is filled with a liquid volume of at least 30 ml, characterized by the following characteristics: f. the nasal irrigation device (10) has a one-piece main body (14) which forms both the fluid reservoir (20) and the nasal applicator (40), and g. the main body (14) fully encloses the nasal irrigation fluid (12) in the delivery state, wherein the dispensing opening (42) is closed in the delivery state by a tool-free removable closure (50), which is also part of the one-piece main body (14). [2] Nasal irrigation device (10) according to claim 1 with the following further feature: a. the fluid reservoir (20) and the nasal applicator (40) are designed as rigid or elastically deformable sub-bodies and are connected to each other in such a way that they assume a substantially fixed relative position to each other [3] Nasal irrigation device (10) according to claim 1 or 2 with the following further feature: a. The nasal irrigation device (10) has an air inlet opening (22) which serves to allow air to flow into the liquid reservoir (20) of the nasal irrigation device during the dispensing of liquid. [4] Nasal irrigation device (10) according to claim 3 with the following further feature: a. The air inlet opening (22) is closed in the delivery state by a second closure (60) which can be removed without tools and which is also part of the one-piece main body (14). [5] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. The first closure (50) and / or the second closure (60) have a handle section (52, 62), wherein by a relative movement of the closure (50, 60) with respect to the liquid reservoir (20) or the nasal applicator (40) the closure can be detached without tools and thereby opens the delivery opening (42) or the air inlet opening (22). [6] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the first closure (50) and / or the second closure (60) are designed such that a separating edge (54, 64) on the main body (14), which remains after removal of the closure, is surrounded by a protective rim (56). [7] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. The main body (14) has at least in the area of ​​the fluid reservoir (20) a surrounding wall (24) whose thickness is between 0.3 mm and 1.0 mm. [8] Nasal irrigation device (10) according to one of claim 7 with the following further feature: a. The fluid reservoir (20) forms an elastically deformable squish section (21) which can be manually reduced in volume by the user, wherein the wall thickness of the wall (24) is preferably between 0.3 mm and 0.6 mm. [9] Nasal irrigation device (10) according to one of claim 7 with the following further feature:: a. The fluid reservoir (20) forms a rigid and non-deformable section which can be manually reduced in volume by the user, wherein the wall thickness of the wall (24) is preferably between 0.6 mm and 1.0 mm. [10] Nasal irrigation device (10) according to one of the preceding claims with the following additional feature: a. the main body (14) consists of one of the following materials or a combination thereof: - Polyethylene, - Polypropylene, - Cycloolefin copolymers, - Polyethylene terephthalate, - Ethyl vinyl alcohol, - Polyvinyl chloride, or - Polypropylene copolymers. [11] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the liquid storage container (20) has a cylindrical basic shape, in particular a circular cylindrical basic shape. [12] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. at an upper end of the liquid storage container (20) the air inlet opening (22) is provided, in particular aligned with a central axis (2) of the circular cylindrical basic shape. [13] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. at a lower end of the fluid reservoir (20) the nasal applicator (40) or a connecting piece (30) leading to the nasal applicator (40) is provided, in particular aligned with a central axis of the circular cylindrical basic shape. [14] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: d. the fluid storage container (20) has a circular cylindrical shape with an outer diameter between 20 mm and 60 mm. [15] Nasal irrigation device (10) according to claim 14 with the following further feature: a. The outer diameter is between 25 mm and 40 mm. [16] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the fluid reservoir (20) has at least in sections a cross-section with non-parallel planar wall sections. [17] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the fluid reservoir (20) has a substantially triangular cross-section. [18] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the fluid reservoir (20) has a substantially rectangular cross-section. [19] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the fluid reservoir (20) has a substantially pentagonal cross-section. [20] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the fluid reservoir (20) has a substantially hexagonal cross-section. [21] Nasal irrigation device (10) according to any of the preceding claims, comprising the following further feature: a. The nasal irrigation device (10) is designed as a nasal irrigation device for children and has the stylized shape of an animal, wherein in particular a mouth, a snout or a trunk of the stylized animal forms the nasal applicator (40). [22] Nasal irrigation device (10) according to any of the preceding claims, comprising the following further feature: a. the nasal irrigation device (10) has the stylized shape of a fish or a dolphin. [23] Nasal irrigation device (10) according to any of the preceding claims, comprising the following further feature: a. the nasal irrigation device (10) has the stylized shape of an elephant. [24] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the fluid reservoir (20) has at least in sections a flat cross-section which in a long extension direction has an extent that is at least 1.5 times greater than in a short extension direction. [25] Nasal irrigation device (10) according to any of the preceding claims, comprising the following further feature: a. the fluid reservoir (20) has an elliptical cross-section at least in sections. [26] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the fluid reservoir (20) is at least partially formed with a bellows section which facilitates the reduction of the internal volume. [27] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. The fluid reservoir (20) is designed as a squeeze reservoir and has two opposing actuating wall sections for the purpose of manual force coupling. [28] Nasal irrigation device (10) according to claim 27 with the following further feature: a. A recessed gripping surface or one with gripping structures (17) is provided on at least one of the operating wall sections. [29] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the fluid reservoir (20) and the nasal applicator (40) are connected to each other via a connecting piece (30), and b. the connecting piece (30) causes the nasal applicator (40) to be angled away from the fluid reservoir (20), in particular an angle between a central axis (2) of the circular cylindrical base and the discharge direction (4) defined by the discharge opening (42) is between 60° and 120°. [30] Nasal irrigation device (10) according to claim with the following further feature: a. the connecting piece (30) has an outer diameter that is equal to or greater than the largest outer diameter on the nasal applicator (40). [31] Nasal irrigation device (10) according to claim with the following further feature: a. the connecting piece (30) has an outer diameter that is smaller than the largest outer diameter on the nasal applicator (40). [32] Nasal irrigation device according to one of the preceding claims with the following additional feature: a. The nasal applicator (40) has a conical contact section (44) for contact with a nostril wall of the user, wherein the conical contact section (44) has an outer diameter of at least 15 mm at its largest diameter point. [33] Nasal irrigation device (10) according to claim with the following further feature: a. The nasal applicator (40) is provided at the end of a connecting piece (30) whose outer diameter is smaller than the outer diameter of the contact section (44) at its largest diameter point. [34] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. The internal volume of the main body (14) is filled to a maximum of 90% with the nasal irrigation fluid (12), preferably to a maximum of 75%. [35] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the liquid level for the discharge of the liquid is preferably at least 80 mm above the delivery opening (42) when the nasal applicator (40) is positioned low, preferably at least 100 mm above the delivery opening (42). [36] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the dispensing opening (42) has a clear passage area of ​​at least 3 mm 2 on, in particular preferably of at least 6 mm 2 or at least 10 mm 2 . [37] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. A liquid channel from the liquid reservoir (20) to the discharge opening (42) has a minimum clear cross-section of at least 3 mm 2 on, in particular preferably of at least 6 mm 2 or at least 10 mm 2 . [38] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. in the nasal irrigation device (10), in particular in its liquid reservoir (20), a nasal irrigation fluid (12) with a liquid volume of at least 40 ml, preferably at least 50 ml, is stored. [39] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the nasal rinsing solution (12) is a preservative-free nasal rinsing solution. [40] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. the closures (50, 60) are designed as reusable closures. [41] Nasal irrigation device (10) according to one of the preceding claims with the following further feature: a. The main body (14) is designed to be completely or partially transparent in order to make the amount of liquid remaining in the main body (14) visible to the user.

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