Ventilation device

Abstract

A device for ventilation which is designed as at least one part of a user interface, in which at least two components of the user interface are connected to one another by a manually releasable locking mechanism, wherein the locking mechanism comprises at least one detent with an insertion bevel, wherein the detent is arranged such that it can be separated from a counter-profile (22) by manual pressure, characterized in that the coarse adjustment (16) comprises a shaft (35) of the forehead support (5) which can be repositioned in the region of holding recesses (36) of the mask body (1) and a locking mechanism provided by resilient fastening tabs (25).

Description

[0001] The invention relates to a device for ventilation which is designed as at least one part of a user interface, in which at least two components of the user interface are connected to one another by a manually releasable locking mechanism.

[0002] Such user interfaces can be implemented in various forms and are typically used to deliver breathing gas provided by a ventilator or a breathing gas or oxygen supply to a patient. Such user interfaces can be implemented, for example, as oxygen cannulas or breathing masks.

[0003] Breathing masks are used, for example, in conjunction with ventilators to deliver breathing gas to the patient and assist in the evacuation of exhaled gas. The breathing mask is typically connected to the ventilator via the breathing tube.

[0004] Respiratory masks are often designed as a modular system in which a multitude of individual system components are mechanically assembled. The individual functional modules accommodate different sizes of respiratory masks and different patient body shapes, while also allowing the modular system to provide different functionalities.

[0005] A mask arrangement is already known from EP 1 334 742 A2.

[0006] EP 1 205 205 A2 describes a breathing mask with a forehead support.

[0007] WO 2004 / 021 960 A2 describes a patient interface equipped with a forehead support.

[0008] From WO 2003 / 035 156 A2 another breathing mask arrangement is known in which an application device and a forehead support are used.

[0009] DE 10 2005 031 541 A1 describes a device for ventilation.

[0010] To ensure secure positioning of the breathing mask in the area of ​​the patient's face, as well as to support and transmit forces introduced into the breathing mask via a breathing tube or hose connector, forehead supports are often connected to the breathing mask. Typically, such forehead supports have height and distance adjustments to accommodate the patient's facial geometry. Both continuous adjustment options and stepless adjustment options, which allow for position changes in predefined steps, are known.

[0011] A disadvantage of both continuous and indexed adjustment devices for forehead rests is that the multitude of possible adjustment options often overwhelms the user, and after disassembly and cleaning of the forehead rest, the original distance setting is difficult to reproduce. Furthermore, the conventional adjustment options have the disadvantage that if excessive forces are inadvertently applied to the adjustment device, the components, often made of plastic, can break, rendering them unusable, necessitating a costly replacement.

[0012] The object of the present invention is therefore to construct a device for ventilation of the type mentioned in the introduction in such a way that a functional, easy-to-use and at the same time robust adjustment device is provided.

[0013] This object is achieved according to the invention in that the locking device comprises at least one detent with an insertion bevel, wherein the detent is arranged so as to be separable from a counter profile by manual pressure and in that the locking device has a coupling element for connecting two components, wherein the coupling is provided on both sides with mechanical coding, one element of which has a central element provided with locking tongues, which is provided with a side profile as a coding, wherein both the locking tongues with their associated profile and their arrangement and also the side profile provide independent coding, so that the coupling can be used for a connection which is secure against interchange.

[0014] The manually releasable locking mechanism allows the two components to be joined together in a position selected by a user and separated again if necessary to carry out cleaning operations or to adjust the position.

[0015] An embodiment for adapting a breathing mask to a facial contour of a patient is provided in that the user interface is designed as a breathing mask having a forehead support provided with an adjustment for changing the forehead support relative to a mask base body and in which the releasable locking device comprises a linear, detented fine adjustment.

[0016] Adaptation to different forehead contours of a patient can be achieved by implementing both a fine adjustment with a fine click and a coarse adjustment in the form of a reversible forehead support in the mask body.

[0017] Continue on page 4 of the original documents

[0018] An easy-to-implement coarse adjustment is provided by the fact that the forehead support can be positioned as a coarse adjustment in at least one of several plug-in positions in the mask body.

[0019] In order to provide a modular system with optional use of a forehead support or a closure element, it is proposed that the mask base body has an adapter for connection to the forehead support and that the adapter is designed to receive at least one component designed differently from the forehead support.

[0020] High functionality is provided by the fact that a base plate of the forehead support has a centering for aligning a forehead cushion.

[0021] Easy adaptability is particularly supported by the fact that at least the coarse adjustment or the fine adjustment can be unlocked by manual pressure.

[0022] Easy insertion into a preselected position is supported by the fact that the locking device includes at least one detent with an insertion bevel.

[0023] Positional security can be supported even under mechanical loads if the locking mechanism has at least one locking lug.

[0024] For carrying out position changes, it proves to be particularly advantageous that the locking mechanism can be separated from a counter profile by manual pressure.

[0025] Ease of use is supported by the use of curved contoured operating surfaces to apply operating forces.

[0026] Injection molding is facilitated by the fact that at least one of the components is made of a thin material provided with stiffening ribs.

[0027] Particularly low manual adjustment forces are achieved by the curved operating surfaces providing recessed grips with a guiding function.

[0028] To achieve high mechanical stability and at the same time to produce injection-molded components easily and with high quality, it is proposed that at least one support structure is formed by a thin-walled three-dimensional material profile.

[0029] When implementing the user interface as a breathing mask, it proves to be advantageous that the coarse adjustment is arranged in the area of ​​a transition from a shaft of the forehead support to the mask body.

[0030] The fact that the fine adjustment is located in the area where the shaft meets the base plate also contributes to a high level of user comfort.

[0031] A further preferred embodiment is that the coarse adjustment comprises a shaft of the forehead support which can be repositioned in the area of ​​the holding recesses of the mask body and a locking device provided by spring-loaded fastening tabs.

[0032] A further advantageous embodiment variant consists in that the fine adjustment comprises a support web of the base plate which can be pulled out from a guide recess in the shaft and a locking device provided by operating tabs.

[0033] A harmonious surface contour with individual surfaces that merge into one another is provided by arranging the fastening tabs and the operating tabs one behind the other in a longitudinal direction of the shaft.

[0034] The invention is explained below by way of example with reference to the figures. They show: Fig. 1 a patient interface designed as a nasal mask in perspective view, Fig. 2 a view of the inside of the mask Fig. 1 from behind, Fig. 3 a view of the exterior of the mask Fig. 1 from the front, Fig. 4 the basic body of the mask Fig. 1 in perspective view, Fig. 5 a side view of a mechanically coded connecting element, Fig. 6 a perspective view of the mask body with a view of a connecting element for receiving a forehead support, Fig. 7 a breathing mask with a forehead support that can be inserted in different positions, Fig. 8 a side view of the arrangement according to Fig. 7, Fig. 9 the order pursuant to Fig. 7 with a different plug-in positioning of the forehead support, Fig. 10 a side view of the device according to Fig. 9, Fig. 11 a breathing mask with a further modified positioning of the forehead support, Fig. 12 a side view of the device according to Fig. 11, Fig. 13 a modified embodiment illustrating the use of a coarse adjustment and an additional fine adjustment for connecting two components of the patient interface, Fig. 14 the order pursuant to Fig. 8 after adjusting the position of the forehead cushion, Fig. 15 the order pursuant to Fig. 10 after twisting the forehead cushion, Fig. 16 a perspective view of the arrangement according to Fig. 14, Fig. 17 a representation of the breathing mask to illustrate a locking of the forehead support to the mask body, Fig. 18 a partially sectioned view of the arrangement according to Fig. 17 when viewed from behind, Fig. 19 a perspective view of a forehead support, Fig. 20 a plan view of the forehead support according to Fig. 19, Fig. 21 a side view of the forehead support according to Fig. 19, Fig. 22 a perspective view of a forehead support to illustrate the realization of a fine adjustment, Fig. 23 a top view of the forehead support according to Fig. 22, Fig. 24 a side view of the forehead support according to Fig. 22, Fig. 25 a representation corresponding Fig. 22 with a different positioning of the fine adjustment, Fig. 26 a plan view of the forehead support according to Fig. 25, Fig. 27 a side view of the forehead support according to Fig. 25, . Fig. 28 an enlarged view illustrating the adjustment and locking device of the forehead support, Fig. 29 a representation of the connecting device according to Fig. 28 when viewed from behind, Fig. 30 a side view of the connecting device according to Fig. 29, Fig. 31 a perspective view of the device according to Fig. 28, Fig. 32 a representation of a holding device for the forehead cushion, Fig. 33 a perspective view of the forehead pad, Fig. 34 a perspective view of the forehead pad according to Fig. 33 when viewed from behind, Fig. 35 a representation of the forehead pad according to Fig. 33 in a disassembled state, Fig. 36 a perspective view of the holding device according to Fig. 32 when viewed from behind, Fig. 37 a plan view of the holding device according to Fig. 36, Fig. 38 a perspective view of the device according to Fig. 32, Fig. 39 a plan view of the holding device according to Fig. 38 when viewed from above, Fig. 40 a breathing mask with a positionable forehead support, in which at least one change in position is derived from a pivoting movement, Fig. 41 compared to the representation in Fig. 40 modified embodiment, Fig. 42 a breathing mask with a forehead support, in which a change in the position of the forehead support is derived by a sliding movement along a curved guide surface, Fig. 43 a further embodiment with a pivotably arranged forehead support and Fig. 44 a breathing mask with a forehead support which is arranged to be displaceable along a curved guide track.

[0035] Fig. Figure 1 shows a patient interface designed as a nasal mask, the mask body (1) of which is made of a relatively rigid material and has a mask bead (2). The mask bead (2) is used to rest against the face of a patient (not shown) and ensures the required seal. Via an angled connector (3), the mask body (1) is connected to a rotatably mounted sleeve (4), which is used to connect to a breathing gas hose (not shown). To ensure secure positioning of the breathing mask in the head area of ​​a patient, a forehead support (5) is used, which is inserted by a shaft (35) into a holder (36) of the mask body (1). The connector (3) and the mask body (1) are connected to each other via a ball joint (18). The ball joint (18) is mounted by a retaining ring (31).

[0036] In Fig. 2 is the inside of the nasal mask made of Fig. 1 viewed from the inside toward a receptacle for the ball joint (18) not shown here. Two pressure gauge ports (9) are located in the upper area. Flow openings (7) lead to exhalation gaps (14) not shown. Insertion bevels (6) are provided for easier insertion of bayonet teeth (26) of a ball cage (24) not shown. The bayonet teeth (26), together with ribs (11), form a mechanical coding. The ribs (11) are connected to the mask body (1) via webs (8).

[0037] Fig. 3 gives a view of the exterior of the mask Fig. 1 when viewed from the front. An outflow surface (10) is ring-shaped. A retaining ring (31) (not shown here) can be attached and secured using ribs (11) and a locking mechanism (12).

[0038] In Fig. Figure 4 shows a perspective view of the main body of the nasal mask. A centering ring (13) is provided for the attachment of the retaining ring (31). Exhalation gaps (14) are located on the sides of the centering ring (13) and open toward the outflow surface (10). The centering ring (13) has recesses (15) that prevent incorrect assembly of the retaining ring by forming a mechanical coding.

[0039] Fig. Figure 5 shows a coupling element (43) that can be used to connect two components (not shown). The coupling (43) has a base element (44) provided with mechanical coding on both sides. One of the codings is designed as an inner sleeve (45), onto which only a counterpart designed as an outer sleeve can be plugged. The second element has a central element (47) provided with locking tongues (46) and a side profile (48) as a coding. Both the locking tongues (46) with their associated profile and arrangement and the side profile (48) provide independent codings, so that the coupling (43) can be used to connect a large number of different module elements in a way that prevents them from being interchanged.

[0040] The perspective representation in Fig. 6 illustrates again the mask body (1) after removing the Fig. 13 forehead support (5) not shown. In the transition area between the outflow surface (10) and the centering ring (13), the arrangement of the exhalation gaps (14) can be seen once again. The exhalation gaps (14) have an essentially rectangular cross-sectional configuration and run with their longitudinal axes in a circumferential direction of the outflow surface (10). The individual exhalation gaps (14) are separated from one another by spacer elements (32). The spacer elements (32) lead to a mechanical connection between the centering ring (13) and the other material of the mask body (1).

[0041] The exhalation gaps (14) are preferably arranged such that they extend in a region of the centering ring (13) facing the outflow surface (10). This directs the breathing gas escaping from the exhalation gaps (14) directly into the area of ​​the outflow surface (10).

[0042] Fig. Figure 7 shows another embodiment of a breathing mask with a forehead support (5). A coarse adjustment (16) and a fine adjustment (17) are used to specify the position of the forehead support (5) relative to the mask body (1). Such adjustments (16, 17) can also be used to connect and position additional components of a patient interface, illustrated using the example of a breathing mask.

[0043] In the illustrated embodiment, the adjustments (16, 17) serve to determine the position of the forehead support (5) relative to the position of a patient's forehead (not shown) and, in particular, to adapt to the different contours of such a forehead. In the present embodiment, the adjustments (16, 17) are thus oriented essentially transversely to a reference plane spanned by the mask bead (2). For example, such adjustments (16, 17) can also be used to determine the height of the forehead support (5) or in connection with other applications.

[0044] The coarse adjustment (16) is arranged in the area of ​​the holder (36) and has at least two holder recesses (19). The forehead support (5) and its shaft (35) can be inserted into the holder recesses (19), thereby establishing a predetermined distance to the patient's forehead in a grid-like manner. In the illustrated embodiment, three holder recesses (19) are used.

[0045] After inserting the shaft (35) into the coarse adjustment (16), it is locked using spring tabs (20) which engage with a holding profile (21) in a corresponding counter profile (22) of the shaft (35).

[0046] The shaft (35) consists of a central bar (23) and mounting brackets (25) equipped with operating recesses (27). When the mounting brackets (25) are pressed together, the counter profiles (22) are guided out of the support profiles (21) of the spring brackets (20), and the forehead support (5) can be removed from the coarse adjustment (16).

[0047] The fine adjustment (17) comprises a support bar (28) that holds a base plate (29) of the forehead support. A forehead cushion (30) is attached to the base plate (29). The support bar (28) extends from the base plate (29) in a direction away from the forehead cushion (30).

[0048] To operate the fine adjustment (17), operating tabs (33) with operating recesses (34) are attached to the shaft (35). When the operating tabs (33) are pressed against each other, the fine adjustment (17) is unlocked, allowing a position change.

[0049] Fig. 8 shows the breathing mask according to Fig. 7 in a side view. Also visible are mounting elements (38) for a harness (not shown). Additional mounting elements (39) are arranged on the base plate (29) to provide a connection to a headband.

[0050] Fig. 9 illustrates in a representation similar to Fig. 7 a different arrangement of the shaft (35) in the coarse adjustment (16). Just as in Fig. 7 the coarse adjustment (16) is provided with a cover element (40) on the side.

[0051] Fig. 10 illustrates the arrangement according to Fig. 9 in a side view. Compared to the illustration in Fig. 8 only the positioning of the coarse adjustment (16) was changed, the positioning of the fine adjustment (17) was retained.

[0052] Fig. 11 shows the arrangement according to Fig. 9 in a further modified position, in which the forehead support (5) has been moved a further step away from the forehead of a patient (not shown). With the three-stage coarse adjustment (16) provided in the exemplary embodiment, the greatest distance from the patient is achieved.

[0053] The order according to Fig. 12 shows the positioning according to Fig. 11 in a side view. Compared to the arrangement in Fig. 10, only the positioning of the coarse adjustment (16) was changed, the fine adjustment (17) was kept unchanged.

[0054] Fig. Figure 13 shows a modified design of the coarse adjustment (16) and the fine adjustment (17). The geometries of the individual components are simplified compared to the previously described embodiments, but the outer contour is less closed.

[0055] Fig. 14 shows the breathing mask according to Fig. 14 with the coarse adjustment (16) unchanged and the fine adjustment (17) modified. The support bar (28) has been retracted from the shaft (35) by one notch. A profile (41) formed on the support bar (28) can be seen, which serves as a notch for the fine adjustment (17).

[0056] According to the Fig. 15, the positioning of the forehead support (5) was compared to the arrangement in Fig. 14 was modified such that the base plate (29) with its support web (28) was rotated by 180° and inserted into the fine adjustment mechanism (17). Due to the asymmetrical arrangement of the support web (28) with respect to the height extension of the base plate (29), this can cause a change in the height of the forehead cushion (30).

[0057] Fig. 16 shows a further perspective view of the arrangement according to Fig. 15. It can be seen in particular that a plurality of projections are arranged in the longitudinal direction of the supporting web (28) to form a gridded profile (41).

[0058] Fig. 17 shows a side view of the breathing mask in Fig. 12 according to viewing direction XVII. In particular, the interlocking of the holding profile (21) of the spring tabs (20) connected to the mask body (1) and the fastening tabs (25) arranged on the shaft (35) with their counter profiles (22) can be seen.

[0059] Fig. 18 shows the arrangement according to Fig. 17 when viewed from the rear. It can be seen in particular that the shaft (35) is formed, at least in some areas, as a profile element having struts (42). This allows high stability to be achieved with a low construction weight and minimal use of material. Furthermore, Fig. 18 similar to Fig. 17 the engagement of the fastening tabs (25) in the spring tabs (20).

[0060] Fig. Figure 19 shows the forehead support (5) in a further perspective view, in particular to illustrate the arrangement of the fastening tabs (25) and the operating tabs (33). Clearly visible in this view is a Fig. 7 shown coarse adjustment (16) formed base web of the shaft (35), which is for insertion into one of the also shown Fig. 7 shown mounting recesses (19).

[0061] The top view of the forehead support (5) according to Fig. 19 in Fig. Figure 20 illustrates, in particular, the arrangement of the operating tabs (33) on the shaft (35). In this arrangement, the base plate (29) is pushed as far as possible into the shaft (35) with the support web (28).

[0062] From the side view in Fig. 21 also shows the arrangement of the fastening tabs (25), the operating tabs (33) and the base web (49) relative to the base plate (29) and the forehead pad (30).

[0063] Fig. 22 shows an arrangement similar to Fig. 19, but with a modified positioning in the fine adjustment area. The base plate (29) with the support bar (28) is extended further out of the shaft (35). The profile (41) locks the selected positioning in the fine adjustment area (17).

[0064] Fig. 23 shows a plan view of the arrangement of Fig. 22 and illustrates in particular the mounting of the support bar (28) using the fine adjustment (17) in the area of ​​the shaft (35). The side view in Fig. 24 also illustrates the Fig. 22 perspective view of the arrangement with the support bar (28) partially pulled out of the shaft (35) and held by the fine adjustment (17).

[0065] Fig. 25 corresponds essentially to the representation in Fig. 19 and Fig. 22, however, there is a distinction between the arrangements in Fig. 19 and Fig. 22 shows the horizontal positioning of the base plate (29) relative to the shaft (35) using the fine adjustment (17). Similar to Fig. 23 and Fig. 24 in relation to Fig. Show 22 Fig. 26 and Fig. 27 a top view or a side view for the positioning of the fine adjustment (17) according to Fig. 25.

[0066] Fig. 28 shows an enlarged view of the shaft (35) of the forehead support (5) when viewed in a direction corresponding to Fig. 18 and base plate (29) removed from the shaft (35). Fig. Figure 28 illustrates in great detail the arrangement of the operating tabs (33) for the fine adjustment (17). The operating tabs (33) are provided with a profile (50) for engagement in the Fig. 22. When the operating tabs (33) are pressed together, the profiles (41, 50) are separated from one another, allowing adjustment of the supporting web (28). The operating tabs (33) are connected to one another by a bridge (51) in the area of ​​their extension facing away from the profiles (50). The fastening tabs (25) are connected by a crossbar (52) in the area of ​​an extension facing away from the counter-profiles (22).

[0067] To manage the Fig. 22, the shaft (35) is provided with a support profile (53) which, in the illustrated embodiment, has the shape of a horizontal "s". The support profile (53) engages in a guide recess of the support web (28), which, for example, Fig. 32. The structural realization of the support profile (53) provides high stability with minimal material usage. Despite the relatively large guide recess (54), the selected design allows the support profile (53) to be manufactured with a comparatively thin wall thickness while maintaining good demoldability.

[0068] Fig. 29 shows the shaft (35) according to Fig. 28 when viewed from the rear. This view also clearly shows that the selected structural design of the shaft (35) achieves high mechanical stability with comparatively thin and uniform wall thicknesses. This structural design particularly supports plastic injection molding.

[0069] The side view in Fig. 30 illustrates in particular that the support profile (53) protrudes relatively far from the shaft (35) and thereby provides good support for the Fig. 22 shown support web (28) along a long adjustment path.

[0070] The representation in Fig. 31 illustrates the relatively long spatial dimensioning of the support profile (53). Fig. 31 also shows the arrangement of a stop (55) which serves to limit the adjustment path of the support web (28) within the fine adjustment (17).

[0071] Fig. Figure 32 shows a rear view of the base plate (29) with the support bar (28). The guide recess (54) of the support bar (28) is particularly visible. The mounting elements (39) for attaching a headband are also visible. Fig. Figure 33 shows the forehead pad (30) that can be attached to the base plate (29). The forehead pad (30) consists of a frame (56) and a support element (57). The support element (57) is made of a soft and preferably elastomeric material, while the frame (56) is made of a harder material and has retaining projections (58).

[0072] From the presentation in Fig. 34 shows that the support projections (58) protrude from a plane defined by the frame (56) and have support profiles (59). After the frame (56) is attached, the support profiles (59) lock into the base plate (29).

[0073] The exploded view in Fig. Figure 35 shows a separate arrangement of the frame (56) and the contact element (57). However, such a separation is not possible in normal use, since the frame (56) and the contact element (57) are glued together or manufactured as a single piece using a two-component technique.

[0074] From the perspective view of the base plate (29) in Fig. 36 it can be seen that the base plate (29) has guide recesses (60) for receiving and locking the Fig. 35. The contours of the guide recesses (60) and the holding projections (58) are adapted to one another, so that a positive connection is realized in a transverse direction.

[0075] Fig. 37 illustrates in particular the very symmetrical design of the base plate (29), which contributes to high strength and uniform material distribution.

[0076] The perspective representation in Fig. 38 shows the base plate (29) according to Fig. 36 when viewed from behind. Fig. 38 and the Fig. 39 illustrate in particular once again the arrangement of the tooth-like profile (41) on the supporting web (28) in order to, together with the Fig. 22 to provide the fine adjustment (17).

[0077] A further embodiment according to the invention can be seen in that the coarse adjustment (16) comprises a shaft (35) of the forehead support (5) which can be inserted in the region of holding recesses (19) of the mask body (1) and a locking device provided by resilient fastening tabs (25).

[0078] It is also contemplated to design the shaft (35) and the mounting recesses (19) in such a way that the shaft (35) can be pivoted and fixed within the mounting recesses (19). The direction of movement is preferably oriented towards the user. By moving the shaft in the mounting recess (19), for example towards the user, the position of the forehead support (5) relative to the user's forehead is changed in two dimensions. Thus, for example, the height of the forehead support (5) and the inclination of the forehead support (25) can be changed simultaneously.

[0079] A further embodiment variant according to the invention consists in Fig. 40 in that the fine adjustment (17) is pivotally movable and can be fixed. The direction of movement is preferably oriented towards the user. By moving the fine adjustment (17), the position of the forehead cushion (30) relative to the user's forehead is changed in two dimensions. Thus, for example, the height of the forehead cushion (30) and the inclination of the forehead cushion (30) can be changed simultaneously.

[0080] According to the invention, it is also intended to realize the fine adjustment (17) in a pivotable manner, i.e. to be changeable with a movement in two dimensions, and to realize the coarse adjustment (16) with a shaft (5) which can be repositioned in the region of the holding recesses (19) of the mask body (1).

[0081] According to the invention, it is also intended to realize the coarse adjustment (16) in a pivotable manner, i.e. to be changeable with a movement in two dimensions, and the fine adjustment (17) with a shaft (5) which can be repositioned in the region of the holding recesses (19) of the mask body (1).

[0082] According to the invention, it is further intended to realize the coarse adjustment (16) and the fine adjustment (17) in a pivotable manner, i.e. each changeable with a movement in two dimensions.

[0083] For example, it is planned to realize the swiveling by means of a ball joint.

[0084] According to the Fig. In the embodiment shown in Figure 40, the supporting web (28) of the forehead support (5) ends in the region of a first pivot joint (61), which is connected to a second pivot joint (63) via a spacer (62). By superimposing the rotational movements of the pivot joints (61, 63) and the spaced arrangement of the pivot joints (61, 63) by the spacer (62), both a height adjustment and a distance adjustment of the forehead support (5) can be carried out. Both the coarse adjustment (16) and the fine adjustment (17) are thus realized by pivot joints in this embodiment.

[0085] According to the embodiment in Fig. 41, the coarse adjustment (16) in the area of ​​the mask base body (1) is designed to be interchangeable and only the fine adjustment (17) is realized by a swivel joint.

[0086] According to the embodiment in Fig. 42, curved guide surfaces (64, 65) are used to position the forehead support (5), along which the shaft (35) can be positioned relative to the base body (1).

[0087] Fig. 43 shows an embodiment in which the shaft (35) is pivotably connected to the base body (1).

[0088] According to the embodiment in Fig. 44, the shaft (35) has at least one guide element (66) that is displaceable along a curved guide track (67). The guide element (66) can be designed, for example, as a pin and the guide track (67) as a groove. This provides reproducible positive guidance for the forehead support (5).

Claims

[1] A ventilation device which is designed as at least one part of a user interface, in which at least two components of the user interface are connected to one another by a manually releasable locking mechanism, wherein the locking mechanism comprises at least one catch with an insertion bevel, wherein the catch is arranged so as to be separable from a counter-profile (22) by manual pressure characterized by that the coarse adjustment (16) comprises a shaft (35) of the forehead support (5) which can be repositioned in the region of holding recesses (36) of the mask body (1) and a locking device provided by resilient fastening tabs (25).

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