Respiratory flow sensor

Abstract

The invention relates to a respiratory flow sensor (11) having a flow tube (12) with a longitudinal axis (14), a first flow tube section (21) and a second flow tube section (41), and having a flow resistance (61) arranged in a flow channel (13) between the first flow tube section (21) and the second flow tube section (41), and two interfaces (32, 52) for reducing the pressure difference caused by the flow resistance (61). The first interface (32) leads to the first flow tube section (21) via a first connecting line and is arranged on the first flow tube section (21). The second interface (52) leads to the second flow tube section (41) via a second connecting line and is arranged on the second flow tube section (41). The interfaces (32, 52) each have a connecting line section (33, 53) extending substantially parallel to the longitudinal axis (14) of the flow tube (12). The openings (35, 55) of the interfaces (32, 52) are adjusted in the same direction. Furthermore, the invention relates to a respiratory adapter and a method for producing a respiratory flow sensor (11).

Description

Technical Field

[0001] The invention relates to a respiratory flow sensor according to the preamble of claim 1 , a respiratory adapter according to the preamble of claim 10 , and a method for producing a respiratory flow sensor according to claim 12 . Background Art

[0002] A respiratory flow sensor, also called a differential pressure flow sensor, a flow measurement sensor or a flow sensor, is arranged between a hose leading from a ventilator or anesthesia machine and a hose leading to a patient.

[0003] A respiratory flow sensor is known from US 4,403,514 A, which comprises a flow tube with a longitudinal axis, a first flow tube section and a second flow tube section, and which also has a hose connection for a hose in the free end region. A flow resistor is arranged in the flow tube between the first flow tube section and the second flow tube section. In addition, radially protruding interfaces are provided to reduce the pressure difference caused by the flow resistor. Connecting hoses are arranged at these interfaces, which can be connected to a measuring device. An interface is arranged on the first flow tube section and leads to the first flow tube section via a first connecting line. Another interface is arranged on the second flow tube section and leads to the second flow tube section via a second connecting line.

[0004] A disadvantage of this known solution is that the connecting lines arranged at the interface can become kinked, which can lead to falsification of the measurement results under certain circumstances.

[0005] A respiratory flow sensor is known from CH 701 755 B1, which comprises a flow tube with a longitudinal axis, a first flow tube section and a second flow tube section. A flow resistance is arranged in the flow tube between the first flow tube section and the second flow tube section. In addition, an interface is provided to reduce the pressure difference caused by the flow resistance. The first interface leads to the first flow tube section via a first connecting line, and the other interface leads to the second flow tube section via a second connecting line. Both interfaces are arranged on the first flow tube section. The interfaces each have a connecting line section of a connecting line, which extends parallel to the longitudinal axis of the flow tube. The openings of the interfaces are adjusted in the same direction.

[0006] The disadvantage of this known solution is that not only does the connection line from the interface to the corresponding flow pipe section have to be formed radially, i.e. a flange projection protruding outwards must be provided, but also complex structural and production measures are required in the design of the sealing material in order to ensure a sealed connection. Only in this way can air short circuits be prevented, which would otherwise lead to serious distortion of the measurement results when using a respiratory flow sensor.

[0007] DE 20 2017 102 703 U1 describes a flow sensor, which comprises a flow tube having a longitudinal axis, a first hose element and a second hose element. In addition, the flow sensor has a flow resistance, which is arranged in the flow tube between the first hose element and the second hose element. Extension hoses for reducing the pressure difference caused by the flow resistance are arranged on the hose elements, wherein a first extension hose leads to the first hose element and another extension hose leads to the second hose element. The first extension hose is arranged on the first hose element and the other extension hose is arranged on the second hose element.

[0008] The disadvantage of this solution is that the extension hose substantially protrudes radially from the flow sensor, so that the measuring hose arranged therein also substantially protrudes radially during use, whereby the flow sensor occupies a relatively large space during use, which complicates the operation of the flow sensor for the user.

[0009] No. 6,585,662 B1 discloses a respiratory flow sensor which is almost identical to the respiratory flow sensor according to CH 701 755 B1 in terms of design and construction, but has significantly greater usability in applications than the latter. Summary of the invention

[0010] The object of the present invention is therefore to create a respiratory flow sensor which does not have at least some of the above-mentioned disadvantages, has a very compact design and can be produced easily and with high quality.

[0011] This object is achieved by the individual features of the independent claims. Advantageous further developments are described in the drawing and in the dependent claims.

[0012] According to the present invention, the respiratory flow sensor comprises a flow tube having a longitudinal axis, a first flow tube section and a second flow tube section, and having a flow resistance arranged in the flow tube between the first flow tube section and the second flow tube section, and having an interface for reducing the pressure difference caused by the flow resistance, wherein the first interface leads to the first flow tube section via a first connecting line, and the other interface leads to the second flow tube section via a second connecting line, and the interfaces each have a connecting line section of a connecting line, which extends substantially parallel to the longitudinal axis of the flow tube and adjusts the openings of the interfaces in the same direction. The first interface is arranged on the first flow tube section, and the other interface is arranged on the second flow tube section.

[0013] In this context, the term “substantially parallel to the longitudinal axis of the flow-through tube” is to be understood as meaning, on the one hand, a mathematically defined orientation parallel to this longitudinal axis, but also an orientation deviating by a few degrees from this longitudinal axis.

[0014] Advantageously, the two interfaces of the respiratory flow sensor itself are oriented substantially parallel to one another, so that the respiratory flow sensor can be designed in a compact manner.

[0015] All interfaces for reducing the pressure difference caused by flow resistance are arranged on the individual flow pipe sections, into which the corresponding connecting lines lead. Therefore, when combining the individual flow pipe sections, care must be taken to ensure that the flow channel is sealed only in the flow pipe, so that the individual parts of the respiratory flow sensor can be designed more simply in terms of construction and can be easily combined. The provision of additional air guides in the connecting lines is avoided, so that the measurement accuracy is guaranteed or even improved compared to the respiratory flow sensors known so far.

[0016] Advantageously, the connecting lines are designed without docking points. In other words, in each connecting line, the opening of the interface to the corresponding entry point of the individual flow sections advantageously contains no docking points. This avoids adverse effects on the measurement results and additionally increases the precise measurement accuracy.

[0017] The interface for reducing the pressure difference caused by flow resistance can be arranged at a position close to the outside of the respiratory flow sensor housing, while ensuring the connection of the connecting hose, which realizes an extremely compact design of the entire respiratory flow sensor.

[0018] The respiratory flow sensor preferably comprises two housing parts, namely a first flow tube section and a second flow tube section, which enables an easy-to-assemble respiratory flow sensor.

[0019] The respiratory flow sensor further preferably consists of an injection-molded part or is itself an injection-molded part. Injection-molded parts can be produced very economically, especially in large quantities, and can be easily assembled if necessary.

[0020] It is further preferred to manufacture the respiratory flow sensor from a plastic suitable for medical use, so that additional coatings or the like in the flow tube can be dispensed with.

[0021] The connecting lines preferably each have a further connecting line section which at least partially extends straight and at an angle to the connecting line section extending essentially parallel to the longitudinal axis of the flow line, which allows a structurally simple design of the connecting line.

[0022] Another connecting line section of the connecting line extends at least partially straight and preferably forms an angle of 40° to 70° with a connecting line section of the connecting line extending essentially parallel to the longitudinal axis of the flow tube, so that the respiratory flow sensor can be easily manufactured, in particular as an injection-molded part, while ensuring good air flow guidance.

[0023] The first flow tube section preferably has a substantially cylindrical tube section and a radially widened tube section, wherein the radially widened tube section widens toward an open end of the first flow tube section. The second flow tube section can thus be easily arranged on the first flow tube section.

[0024] As an alternative or in addition, the second flow tube section has a substantially cylindrical tube section and a radially widened tube section, wherein the radially widened tube section widens toward an open end of the second flow tube section. In this way, the first flow tube section can be easily arranged on the second flow tube section and the two flow tube sections can be arranged to be sealed to each other.

[0025] In particular, a radially protruding flange with a contact surface is provided at each open end of the first and second flow pipe sections, so that the diameter in this area is larger and the layout is thus simplified by means of two contact surfaces of the two flow pipe sections.

[0026] Preferably, a first connection recess is included on the radially widened section of the first flow tube section for at least partially positioning the other interface of the second flow tube section. Thus, the other interface of the second flow tube section can be easily arranged in the first connection recess, so that the size of the respiratory flow sensor can be reduced and a respiratory flow sensor that is as compact as possible can be provided.

[0027] The first connecting recess is mainly arranged on the radially protruding flange of the first flow pipe section. The stability of the first flow pipe section is increased in the area of ​​the radially protruding flange, so that the first connecting recess can also show improved stability or strength.

[0028] On the radially widened section of the first flow pipe section, a first supporting structure advantageously supports another interface of the second flow pipe section, thereby providing a larger contact surface for the other interface and positioning it in a more mechanically stable manner without kinking or the like.

[0029] The further interface of the second flow pipe section advantageously has a support section, thanks to which the interface can advantageously rest against the first connection recess on the radially widened section of the first flow pipe section. The further interface is thus held stably in the connection recess. This further prevents the further interface from kinking or the like due to external mechanical loads.

[0030] As an alternative or additional solution, a further connection recess is included on the radially widened section of the second flow tube section for at least partially positioning the first interface of the first flow tube section. Therefore, the first interface of the first flow tube section can be easily arranged in the second connection recess, so that the size of the respiratory flow sensor can be further reduced and a respiratory flow sensor that is as compact as possible can be provided.

[0031] The second connecting recess is mainly arranged on the radially protruding flange of the second flow pipe section. The stability of the second flow pipe section is increased in the area of ​​the radially protruding flange, so that the second connecting recess can also show improved stability or strength.

[0032] The first interface of the first flow pipe section is advantageously supported by another supporting structure on the radially widened section of the second flow pipe section, so that the interface has an enhanced mechanical stability and does not get kinked or the like.

[0033] The first interface of the first flow pipe section advantageously has a support section, thanks to which the interface can advantageously rest against the second connection recess on the radially widened section of the second flow pipe section. The first interface is thus held stably in the connection recess. This further prevents the first interface from twisting or the like due to external mechanical loads.

[0034] A further connecting line section of a connecting line extends at least partially straight and preferably forms an angle of 48° to 62° with a connecting line section of the connecting line extending essentially parallel to the longitudinal axis of the flow tube, so that in addition to being able to easily manufacture the respiratory flow sensor, in particular as an injection-molded part, while ensuring good air conduction, the expenditure on post-processing is also low, for example when demolding the respiratory flow sensor.

[0035] Another connecting line section of the connecting line extends at least partially straight, and this connecting line section and the connecting line section of the connecting line extending essentially parallel to the longitudinal axis of the flow tube particularly preferably form an angle of 52° to 58°. In addition to the above-mentioned advantages, the respiratory flow sensor can also be optimized in terms of stability and material requirements for manufacturing the product.

[0036] Another connecting line section of the other connecting line extends at least partially straight and preferably forms an angle of 130° to 160° with a connecting line section of the other connecting line extending essentially parallel to the longitudinal axis of the flow tube, so that the respiratory flow sensor can be easily manufactured, in particular as an injection-molded part, while ensuring good air flow guidance.

[0037] Another connecting line section of the other connecting line extends at least partially straight and preferably forms an angle of 138° to 152° with a connecting line section of the other connecting line extending essentially parallel to the longitudinal axis of the flow tube, so that in addition to being able to easily manufacture the respiratory flow sensor, in particular as an injection-molded part, while ensuring good air conduction, the expenditure on post-processing is also low, for example when demolding the respiratory flow sensor.

[0038] Another connecting line section of another connecting line extends straight at least in part, and this connecting line section and a connecting line section of another connecting line extending essentially parallel to the longitudinal axis of the flow tube particularly preferably form an angle of 142° to 148°, so that in addition to the above-mentioned advantages, the respiratory flow sensor can also be optimized in terms of stability and material requirements for manufacturing the product.

[0039] Preferably the first interface is arranged adjacent to the other interface. Therefore both interfaces are arranged in the same region of the flow tube, thus preventing the connecting hose from kinking.

[0040] Preferably, the first connection is arranged adjacent to the other connection and spaced apart from one another, so that the connecting hose can be easily connected to the individual connections.

[0041] The first interface is preferably arranged at least partially on the outer jacket surface of the first flow line section and thus outside the housing of the respiratory flow sensor. The respiratory flow sensor can thus be manufactured easily and an absolutely tight connection between the first interface and the first flow line section can be ensured. Additional grooves / comb structures can be dispensed with in the region of the further connecting line section.

[0042] As an alternative or additional solution, the other interface is at least partially arranged on the jacket surface of the second flow pipe section and is therefore arranged outside the housing of the respiratory flow sensor. Therefore, an absolutely sealed connection between the second interface and the second flow pipe section can be ensured. In the area of ​​the other connecting pipeline section, an additional groove / comb structure can be abandoned. Therefore, the two flow pipe sections can be combined together by simple processing steps, and the flow resistance can be accurately positioned in the flow pipe, and the absolutely sealed connection requirement between the two flow pipe sections can be ensured.

[0043] Preferably, a tool opening is provided for removing a forming tool for forming a further connecting line section of the connecting line and respective closing elements for closing the tool opening, wherein a first closing element for closing a further connecting line section of the first connecting line is preferably arranged on the first flow line section, and a second closing element for closing a further connecting line section of the first connecting line is preferably arranged on the second flow line section, so that the respiratory flow sensor can be easily manufactured. By closing the tool opening, air conduction in the respective connecting line is ensured without air short circuit.

[0044] The first closure element is preferably arranged rotatably on the first flow tube section by means of a hinge, firstly by means of a folding hinge. The second closure element is also preferably arranged rotatably on the second flow tube section by means of a hinge, firstly by means of a folding hinge. The closure elements are thus arranged captively on the individual components. These closure elements are thus available during the entire assembly of the respiratory flow sensor and can be optimally arranged to close the tool opening when necessary or during the production of the respiratory flow sensor.

[0045] These closing elements are advantageously made of a medically suitable material, in particular of a medically suitable plastic. If the corresponding flow tube sections are made of the same material or a material that is compatible with the connection technology, the tool opening can be closed by a simple procedure.

[0046] The first and / or second closing element can be designed as a plug which closes the corresponding tool opening in a simple processing step.

[0047] Preferably, grooves / comb-like structures are provided on the tool opening and / or the closing element so that they engage with one another when brought together, thereby ensuring a highly leak-tight closure.

[0048] The closure element is preferably fixed to the corresponding flow-through pipe section by a leak-tight connection, particularly preferably by ultrasonic welding, in order to close the tool opening, thereby ensuring an absolutely leak-tight closure.

[0049] In an alternative embodiment, a welding method other than ultrasonic welding is used, and the closing element for closing the tool opening is fixed to the corresponding flow pipe section by a sliding fit or by adhesive bonding.

[0050] In another alternative embodiment, for example, a two-component solution is provided in the production of the respiratory flow sensor, whereby, for example, in the region of the individual contact surfaces, at least one of them is composed of or coated with a softer plastic or a plastic with adhesive properties. When the corresponding parts are assembled, they are directly connected to one another in a sealing manner.

[0051] This two-component solution is suitable for parts that need to be connected to each other in the manufacture of respiratory flow sensors, especially parts that need to be connected to each other in a sealed manner.

[0052] The respiratory adapter according to the invention comprises at least one respiratory flow sensor having at least one of the above-mentioned features, and at least one connecting hose, which connects one of the interfaces of the respiratory flow sensor to a measuring device in order to establish a fluid connection between the measuring device and the respiratory flow sensor, wherein the fluid connection is located directly in one of the flow tube sections of the respiratory flow sensor and is designed without a docking point.

[0053] The measuring device is advantageously designed to measure the pressure difference in the respiratory flow sensor.

[0054] The respiratory adapter is easy to use and has the advantages described herein in connection with the respiratory flow sensor.

[0055] In this context, the term "fluid connection" is to be understood as a connection for a fluid (such as air) through which a fluid can flow from an entry point to an exit point, optionally also a sealed connection.

[0056] A connecting hose that can be connected to a measuring device is advantageously provided at each interface of the respiratory flow sensor. In order to facilitate the user to use the respiratory adapter, these connecting hoses can be designed differently visually (such as color) and / or tactilely.

[0057] Preferably, the respiration adapter is provided with at least one artificial respiration hose and a nozzle leading to the patient, wherein the at least one artificial respiration hose connects the nozzle and at least one respiration flow sensor, thereby producing an easy-to-use respiration adapter.

[0058] In addition, a further artificial respiration hose is advantageously provided, which is likewise connected to at least one respiration sensor and can be connected to a respirator or intensive care unit, so that a respiration adapter which is easy to use is provided to the user.

[0059] The method for manufacturing a respiratory flow sensor according to the present invention is characterized by the following steps:

[0060] The first and second through-line sections are respectively formed in a production tool mold, for which purpose slides are used as forming tools and / or pins are used as forming tools to form the connecting line sections and further connecting line sections of the respective connecting line (step a)).

[0061] As an alternative or in addition, further connecting line sections of the respective connecting line are formed using pins as forming tools (step a)).

[0062] One or more forming tools are arranged or can be arranged in a corresponding production tool mold, so that easy production of the first flow pipe section as well as the second flow pipe section is achieved.

[0063] The first through-flow pipe section and the second through-flow pipe section are demoulded from the corresponding production tool mold (step b)).

[0064] The forming tool designed as a slide or pin significantly simplifies the demoulding of the first through-flow pipe section and the second through-flow pipe section from the corresponding production tool mold.

[0065] The first flow tube section and the second flow tube section are aligned, ie axially and with respect to the angular position, with one another (step c)), thereby ensuring that these parts are correctly aligned with one another and thus that the respiratory flow sensor functions properly.

[0066] The first flow-through pipe section and the second flow-through pipe section are tightly connected (step d)). As a non-exhaustive list, the tightly connected connection includes welding, in particular ultrasonic welding, a sliding fit, an adhesive connection or a two-component solution.

[0067] Advantageously, the tool openings at the interfaces of the respiratory flow sensor are closed by means of ultrasonic welding. By closing the tool openings, air conduction in the corresponding connecting lines is ensured without air short-circuiting. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Additional advantages, features and details of the invention are described in the following description, in which exemplary embodiments of the invention are explained with reference to the drawings.

[0069] The reference numeral list, the technical contents and the legends in the patent claims are all part of the patent disclosure. The drawings are introduced in a related and comprehensive manner. The same reference numerals represent corresponding parts, and reference numerals with different marks represent parts with the same or similar functions.

[0070] It shows:

[0071] Figure 1 A perspective view of a respiratory flow sensor according to a first embodiment of the present invention;

[0072] Figure 2 according to Figure 1 A perspective exploded view of a respiratory flow sensor;

[0073] Figure 3 according to Figure 1 A side view of a first flow tube section of a respiratory flow sensor;

[0074] Figure 4 according to Figure 3 A longitudinal sectional view of a first flow pipe section;

[0075] Figure 5 according to Figure 4 Detailed cross section Figure X ;

[0076] Figure 6 according to Figure 1 A side view of a second flow tube section of a respiratory flow sensor;

[0077] Figure 7 according to Figure 6 A longitudinal sectional view of a second flow pipe section;

[0078] Figure 8 according to Figure 7 Detailed cross-sectional view of Y;

[0079] Fig. 9 according to Figures 1 to 8 A perspective view of a respiratory adapter including a respiratory flow sensor;

[0080] Fig.10 A side view of a first flow tube section of a respiratory flow sensor according to a second embodiment;

[0081] Fig.11 according to Fig.10 A longitudinal sectional view of a first flow pipe section;

[0082] Fig.12 A side view of a second flow tube section of a respiratory flow sensor according to a second embodiment;

[0083] Fig.13 according to Fig.12 A longitudinal sectional view of a second flow pipe section;

[0084] Fig.14 according to Fig.11 and 13 Detailed cross-section diagram of Z;

[0085] Fig.15 A longitudinal sectional view of a first flow tube section of a respiratory flow sensor according to a third embodiment;

[0086] Fig.16 A longitudinal sectional view of a second flow tube section of a respiratory flow sensor according to a third embodiment;

[0087] Fig.17 A perspective view of a respiratory flow sensor according to a second embodiment of the present invention;

[0088] Fig.18 according to Fig.17 A perspective view of a first flow pipe section;

[0089] Fig.19 according to Fig.17 A perspective view of a second flow pipe section;

[0090] Fig. 20 according to Fig.10 Another perspective view of a respiratory flow sensor. DETAILED DESCRIPTION

[0091] exist Figures 1 to 8 The first embodiment of the respiratory flow sensor 11 shown in FIG. 1 is an injection-molded part in this example, and the respiratory flow sensor 11 is made of plastic.

[0092] like Figure 1 and 2 As shown, the respiratory flow sensor 11 has a flow tube 12 with a longitudinal axis 14 , a first flow tube section 21 and a second flow tube section 41 and, in the region of two free ends 16 and 18 , a tube connection 17 and 19 for a respiration tube, respectively.

[0093] On the hose connection 17, an artificial respiration hose is arranged, which leads to a nozzle or a breathing mask (not shown here), which is applied to the patient to support breathing. On the other hose connection 19, an artificial respiration hose leading to a respirator is arranged.

[0094] In the flow pipe 12 forming the flow channel 13, a flow resistor 61 is arranged between the first flow pipe section 21 and the second flow pipe section 41. The flow resistor is designed as a throttle valve. A recess 62 is arranged around the flow resistor 61, which cooperates with the boss 30 arranged on the first flow pipe section 21, thereby ensuring the correct orientation of the flow resistor 61 in the flow channel 13 when assembling the respiratory flow sensor 11.

[0095] In addition to the protruding boss 30 and the recess 62 that cooperates with it, the correct orientation of the flow resistor 61 in the flow channel 13 and the correct orientation of the first flow pipe section 21 and the second flow pipe section 41 can also be ensured by an adjustment device and / or by a groove / comb structure. For example, the adjustment device can also be arranged on the outside.

[0096] The respiratory flow sensor 11 has two interfaces 32 and 52 for reducing the pressure difference caused by the flow resistance 61. The openings 35 and 55 of the interfaces 32 and 52 are oriented in the same direction, that is, in the direction of the free end 16 of the first flow tube section 21. For this purpose, the interfaces 32 and 52 are arranged adjacent to each other and spaced apart from each other on the outer jacket surface of the respective flow tube section 21 and 41.

[0097] The first flow pipe section 21 (see in particular Figures 3 to 5 ) is the first housing part of the respiratory flow sensor 11. The first flow tube section 21 has a substantially cylindrical tube section 22 and a radially widened tube section 26, so that the diameter in this area is larger. In the substantially cylindrical tube section 22, a guide element 23 is arranged in its flow channel section, which divides the flow channel 13 into two equal-sized sections in this area and realizes targeted air guidance in the flow tube 12.

[0098] In the radial widening section 26, the corresponding flow channel section is also widened in the direction of the open end 24 of the first flow tube section 21. At the open end 24, a radially protruding flange 27 with a contact surface 29 is provided, so that the diameter in this area is larger. When the respiratory flow sensor 11 is assembled, the contact surface 29 faces the second flow tube section 41. The first ring 28 of the groove / comb structure is arranged on the contact surface 29 on the flange 27. On the radial widening section 26, a first connecting recess 27a is provided in the region of the flange 27, which is supported by a first supporting structure 27b. The other interface 52 of the second flow tube section 41 has a supporting section 52a adjacent to the opening 55, which in the engaged state abuts or lies flat in the first connecting recess 27a of the respiratory flow sensor 11 and is supported by the first supporting structure 27b.

[0099] The boss 30 protrudes from the contact surface 29 and is used to correctly orient the flow resistor 61 in the flow tube 12 when assembling the respiratory flow sensor 11 .

[0100] The first interface 32 for reducing the pressure difference caused by the flow resistance 61 leads to the flow channel section of the first flow pipe section 21 through the first connecting line. The first connecting line has a connecting line section 33, which extends substantially parallel to the longitudinal axis 14 of the flow pipe 12, and another connecting line section 34, which extends straight in part and forms an angle a of 40° to 70°, preferably 48° to 62°, and particularly preferably 52° to 58° with the connecting line section 33 extending substantially parallel to the longitudinal axis 14 of the flow pipe 12. In the present example, the angle a is 55°.

[0101] In the extension of the further connecting line section 34 of the first connecting line, a first tool opening 36 is provided on the first flow line section 21 for removing a forming tool for forming the further connecting line section 34 and a first closing element 38 for closing the tool opening 36. The first closing element 38 is rotatably arranged on the first flow line section 21 by means of a hinge, here by means of a bending hinge 39 or a film hinge.

[0102] A groove structure 37 is designed around the first tool opening 36. A comb-like structure 40 is designed on the first closing element 38, which engages in the groove structure 37 when the first tool opening 36 is closed and ensures the sealing closure of the first tool opening 36 during the welding process, especially the ultrasonic welding process, and thus ensures the sealing of the first connecting line.

[0103] exist Figure 5 In the illustration of FIG. 3 , the first tool opening 36 is shown in the closed state.

[0104] The second flow pipe section 41 (see in particular Figures 6 to 8 ) is the second housing part of the respiratory flow sensor 11. The second flow tube section 41 has a substantially cylindrical tube section 42, which tapers on the outside in the direction of the free end 18, and a radially widened section 46. In the substantially cylindrical tube section 42, a guide element 43 is arranged in its flow channel section, which divides the flow tube 12 into two equal-sized sections in this area and realizes a targeted air flow guidance in the flow tube 12. The free end 45 of the guide element 43 is set back relative to the free end 18 of the flow tube 12.

[0105] In the radial (i.e. outward) widening section 46, the corresponding flow channel section is also widened in the direction of the open end 44 of the second flow tube section 41. At the open end 44, a radially protruding flange 47 with a contact surface 49 is provided, which, when the respiratory flow sensor 11 is assembled, faces the first flow tube section 21 or its contact surface 29. On the contact surface 49 of the flange 47, a second ring 48 with a groove / comb structure is provided, which engages in the first ring 28 with a groove / comb structure and merges with it during welding, in particular ultrasonic welding. In this way, a sealed connection is ensured between the first flow tube section 21 and the second flow tube section 41 in a simple manner. Complex multiple structures for groove / comb structures or pressure surfaces, as proposed in CH 701755B1, are avoided with this solution according to the invention.

[0106] Offset from the contact surface 49, a positioning recess 51 is provided on the flange 47, in which the flow resistor 61 is at least partially positioned. Holes 50 are arranged on the cylindrical ring of the positioning recess 51, into which the bosses 30 of the first flow tube section 21 are pressed when the respiratory flow sensor 11 is assembled. Due to this structural design, not only can the flow resistor 61 be correctly oriented in the flow channel 13 when the respiratory flow sensor 11 is assembled, but in combination with the grooves / comb structures 28 and 48 on the flanges 27 and 47, flow resistors of different thicknesses can also be arranged depending on the specific application area or needs. As a result, the respiratory flow sensor 11 can be used flexibly and can be easily adapted to other types of flow resistors 61. The flow resistor 61 used is held between the first flow tube section 21 and the second flow tube section 41, in particular clamped or held in another way, such as partially or completely bonded.

[0107] When the respiratory flow sensor 11 is in the assembled state, no flange pressure surface is formed on the flanges 27 and 47. The first flow pipe section 21 as the first housing part of the respiratory flow sensor 11 and the second flow pipe section 41 as the second housing part of the respiratory flow sensor 11 are connected only by the groove / comb structures 28 and 48 of simple design on the flanges 27 and 47.

[0108] A further connection recess 47a is provided on the radially widened section 46 in the region of the flange 47, which is supported by a further support structure 47b. The first interface 32 of the first flow tube section 21 has a support section 32a adjacent to the first closure element 38, which in the engaged state abuts or rests in the further connection recess 47a of the respiratory flow sensor 11 and is supported by the support structure 47b.

[0109] The second interface 52 for reducing the pressure difference caused by the flow resistance 61 leads to the flow channel section of the second flow pipe section 41 through the second connecting line. The second connecting line has a connecting line section 53, which extends substantially parallel to the longitudinal axis 14 of the flow pipe 13, and another connecting line section 54 extending straight in part, and forms an angle β of 130° to 160°, preferably 138° to 152°, and particularly preferably 142° to 148°. In the present example, the angle β is 145°.

[0110] In the extension of the other connecting line section 54 of the second connecting line, a second tool opening 56 is provided on the second flow line section 41 for removing a forming tool for forming the other connecting line section 54 and a second closing element 58 for closing the tool opening 56. The second closing element 58 is rotatably arranged on the second flow line section 41 by means of a hinge, here by means of a bending hinge 59 or a film hinge.

[0111] A groove structure 57 is formed around the second tool opening 56. A comb-like structure 60 is formed on the second closing element 58, which engages in the groove structure 57 when the first tool opening 36 is closed and ensures the sealing closure of the second tool opening 56 during the welding process, especially the ultrasonic welding process, and thus ensures the sealing of the second connecting line.

[0112] exist Figure 8 In the illustration of FIG. 5 , the second tool opening 56 is shown in an open state.

[0113] To produce the respiratory flow sensor 11, the first flow tube section 21 is formed in a production tool mold, wherein the connecting line section 33 is formed by means of a pin as a forming tool, and the other connecting line section 34 is formed by means of a slide as a forming tool. The first flow tube section 21 is then demolded from the production tool mold, for which purpose the slide is pulled out of the first flow tube section 21 in advance.

[0114] At the same time or with some delay, the second flow pipe section 41 is formed in the production tool mold, wherein the connecting pipe section 53 is formed by means of a pin as a forming tool and the other connecting pipe section 54 is formed by means of a slide as a forming tool. The second flow pipe section 41 is then demolded from the production tool mold, for which purpose the slide is pulled out of the second flow pipe section 41 in advance.

[0115] The tool openings 36 and 56 can now be closed using the closing elements 38 and 58 .

[0116] The first through-flow duct section 21 and the second through-flow duct section 41 are now aligned with one another, ie axially and with respect to the angular position.

[0117] The first through-flow pipe section 21 and the second through-flow pipe section 41 are then connected to one another in a sealing manner, in the present exemplary embodiment by ultrasonic welding.

[0118] exist Fig. 9 The respiratory adapter 71 shown in FIG. 1 comprises a respiratory flow sensor 11, a connecting hose 73, which connects the interface 32 of the respiratory flow sensor 11 with a measuring device 76 to establish a first fluid connection from the measuring device 76 to the respiratory flow sensor 11, and a connecting hose 74, which connects the interface 52 of the respiratory flow sensor 11 with the measuring device 76 to establish a second fluid connection from the measuring device 76 to the respiratory flow sensor 11. These fluid connections are used to directly access one of the flow pipe sections of the respiratory flow sensor 11 and do not contain any docking points.

[0119] In addition, the breathing adapter 71 also includes a first artificial breathing hose 77 and a nozzle 78 designed as a breathing mask. The first artificial breathing hose 77 connects the nozzle 78 to the respiratory flow sensor 11. In addition, the breathing adapter 71 also has a second artificial breathing hose 79, which connects the respiratory flow sensor 11 to the respirator 72.

[0120] The measuring device 76 is used to measure or record and process the pressure difference generated in the respiratory flow sensor 11. In the present example, the measuring device 76 is integrated in the ventilator 72, which is used for the artificial ventilation of a patient.

[0121] exist Figures 10 to 14 In the second embodiment of the respiratory flow sensor shown in FIG. 1 , the first flow tube section 81 (see in particular Fig.10 and 11 ) is different from the first flow pipe section 21 of the respiratory flow sensor 11 mainly in that it adopts a multi-section design and has a connecting pipe, wherein the connecting pipe section 83 leading out of the opening 85 of the interface 82 is not directly connected to the other connecting pipe section 84. The connecting pipe section 83 and the other connecting pipe section 84 are respectively connected to the open end 86 of the first flow pipe section 81. The interface 82 is still arranged on the interface of the first flow pipe section 81.

[0122] The first flow pipe section 81 is designed as two sections, namely the flow pipe section 91 and the flow pipe section 93, which are connected to each other via a sealed connection. Due to the two-section feature of the first flow pipe section 81, the structure of the connecting line can be realized therein in a desired manner and method, while ensuring easy production. Therefore, no production or tool opening is required for the shaping of the first flow pipe section 81.

[0123] In the second embodiment of the respiratory flow sensor, the second flow tube section 101 (see in particular Fig.12 and 13) is basically structurally consistent with the second flow tube section 41 of the respiratory flow sensor 11. However, in the connected state, in the area opposite to the interface 82 of the first flow tube section 81, the second flow tube section 101 has an air deflector 112, whose cavity 113 is open toward the free end 114 of the second flow tube section 101.

[0124] like Fig.14 As shown in detail in FIG. 1 , when the first flow pipe section 81 and the second flow pipe section 101 are connected, the direction of the first connecting line from the interface 82 to the inside of the first flow pipe section 81 can be seen. The fluid is turned in the cavity 113. The sealed connection between the first flow pipe section 81 and the second flow pipe section 101 in this turning area is only realized in the contact sections 116 and 117. In this embodiment, a first connecting line is designed that is not without a docking point. However, the second connecting line in the second flow pipe section 101 still has no docking point.

[0125] According to the first flow tube section 121 of the respiratory flow sensor of the third embodiment (see Fig.15 ) and the second flow pipe section 141 (see Fig.16 ) differ only in the design of their connecting pipes.

[0126] The first interface 132 for reducing the pressure difference caused by flow resistance leads to the flow channel section of the first flow pipe section 121 through the first connecting pipe. The connecting pipe section 133 extends substantially parallel to the longitudinal axis 124 of the flow pipe, and forms an angle γ of 130° to 160° with another connecting pipe section 134, preferably 138° to 152°, and particularly preferably 142° to 148°. In this example, the angle γ is about 147°. The angle γ is appropriately selected so that when demolding the first flow pipe section 121, the forming tool designed as a slide can be easily pulled out without the need for a tool opening.

[0127] The second interface 152 for reducing the pressure difference caused by flow resistance leads to the flow channel section of the second flow pipe section 141 through the second connecting pipe. The connecting pipe section 153 extends substantially parallel to the longitudinal axis 124 of the flow pipe, and another connecting pipe section 154 forms an angle δ of 40° to 70° with the connecting pipe section 153 extending substantially parallel to the longitudinal axis 124 of the flow pipe, preferably 48° to 62°, and particularly preferably 52° to 58°. In this example, the angle δ is 53°. The angle δ is reasonably selected so that when demolding the first flow pipe section 141, the forming tool designed as a slide can be easily pulled out, and no tool opening is required for this.

[0128] A first connecting pipeline and a second connecting pipeline without a docking point are designed respectively.

[0129] exist Figures 17 to 20In another embodiment of the respiratory flow sensor 211 shown, a flow tube 212, a longitudinal axis 214, a first flow tube segment 221 and a second flow tube segment 241 are presented, wherein the first flow tube segment 221 (see in particular Fig.18 ) and the first flow tube section 21 of the respiratory flow sensor 11 are only mainly that the first closing element 238 at the interface 232 is designed as a tube section 239. The first closing element 238 has a first tool opening 236, which leads to another connecting tube section 234, wherein the connecting tube section 233 leading from the opening 235 of the interface 232 is directly connected to the other connecting tube section 234. The first interface 232 is still arranged on the interface of the first flow tube section 221.

[0130] The first flow pipe section 221 is the first housing part of the respiratory flow sensor 211. The first flow pipe section 221 has a substantially cylindrical pipe section 222 and a radially widened pipe section 226, so that the diameter in this area is larger. In the substantially cylindrical pipe section 222, a guide element 223 is arranged in its flow channel section, which divides the flow channel 213 into two equal-sized sections in this area and realizes targeted air guidance in the flow pipe 212.

[0131] In the radially widened section 226 of the first flow tube section 221, the corresponding flow channel section also widens in the direction of the open end 224 of the first flow tube section 221 (see in particular Fig.18 ). A radially protruding flange 227 is provided at the open end 224. A first connection recess 227a is provided on the radially widened section 226 in the region of the flange 227, which is supported by a first support structure 227b. The other interface 252 of the second flow pipe section 241 has a support section 252a adjacent to the opening 255, which in the engaged state abuts or lies flat against the first connection recess 227a of the respiratory flow sensor 11.

[0132] In this embodiment of the respiratory flow sensor 211, the second flow tube section 241 (see in particular Fig.19 ) is basically consistent with the second flow pipe section 41 of the respiratory flow sensor 11 in terms of structural design. However, the second flow pipe section 241 has a closing element 258 on the second interface 252, which is designed as a pipe section 259. The closing element 258 has a second tool opening 256, which leads to another connecting pipe section 254, wherein the connecting pipe section 253 leading out of the opening 255 of the second interface 252 is directly connected to the other connecting pipe section 254. The second interface 252 is still arranged on the interface of the second flow pipe section 241.

[0133] The second flow tube section 241 is a second housing part of the respiratory flow sensor 211. The second flow tube section 241 has a substantially cylindrical tube section 242, which tapers on the outside in the direction of the free end 218. The second flow tube section 241 has a segment 246 that expands radially toward the open end 244. In the substantially cylindrical tube section 242, a guide element 243 is arranged in its flow channel section, which divides the flow tube 212 into two segments of equal size in this area and realizes targeted air guidance in the flow tube 212. The free end 245 of the guide element 243 is retracted relative to the free end 218 of the flow tube 212.

[0134] On the radially widened section 246 of the second flow tube section 241, another connecting recess 247a is provided in the region of the flange 247, which is supported by another supporting structure 247b. The first interface 232 of the first flow tube section 221 has a supporting section 232a adjacent to the first closure element 238, which in the coupled state abuts or rests against another connecting recess 247a of the respiratory flow sensor 11.

[0135] Fig. 20 The joined respiratory flow sensor 211 is shown, wherein the closed tool openings 236 and 256 are shown on the tube sections 239 and 259. They are hermetically sealed by an ultrasonic welding device during the ultrasonic welding process.

[0136] Reference numerals list

[0137] 11. Respiratory flow sensor

[0138] 12 Flow tube

[0139] 13 Circulation channels

[0140] 14 12 vertical axis

[0141] 16 12 free end

[0142] 17 Hose connection

[0143] 18 12 free end

[0144] 19 Hose connection

[0145] 21 1. Circulation pipe section

[0146] 22 Cylindrical pipe section

[0147] 23 Guide element

[0148] 24 21 free end

[0149] 26 Widening pipe section

[0150] 27 Flange

[0151] 27a 1. Connecting notch

[0152] 27b 1. Support structure

[0153] 28 First ring member of groove / comb structure

[0154] 29 Contact surface

[0155] 30 Boss

[0156] 32 1. Interface

[0157] 32a Support section 32

[0158] 33 Connecting pipe section

[0159] 34 Another connecting pipe section

[0160] 35 32 opening

[0161] 36 1. Tool opening

[0162] 37 Groove interface

[0163] 38 1. Closure element

[0164] 39 Bend hinge

[0165] 40 Comb structure

[0166] 41 2. Circulation pipe section

[0167] 42 Cylindrical pipe section

[0168] 43 Guide element

[0169] 44 21 free end

[0170] 45 43 free end

[0171] 46 Expanded pipe section

[0172] 47 Flange

[0173] 47a Another connection notch

[0174] 47b Another support structure

[0175] 48 Second ring member of groove / comb structure

[0176] 49 contact surface

[0177] 50 holes

[0178] 51 Positioning recess

[0179] 52 2. Interface

[0180] 52a Support section of 52

[0181] 53 Connecting pipe section

[0182] 54 Another connecting pipe section

[0183] 55 32 openings

[0184] 56 2. Tool opening

[0185] 57 Groove interface

[0186] 58 2. Closure element

[0187] 59 Bend hinge

[0188] 60 Comb structure

[0189] 61 Flow resistance

[0190] Notch 62 61

[0191] α Angle between 33 and 34

[0192] β Angle between 53 and 54

[0193] 71 Breathing adapter

[0194] 72 Ventilator

[0195] 73 1. Connect the hose

[0196] 74 2. Connect the hose

[0197] 76 Measuring device / ventilator

[0198] 77 1. Artificial respiration hose

[0199] 78 Nozzle

[0200] 79 2. Artificial respiration hose

[0201] 81 1. Circulation pipe section

[0202] 82 1. Interface

[0203] 83 Connecting pipe section

[0204] 84 Another connecting pipe section

[0205] 85 82 opening

[0206] 86 81 free end

[0207] 91 1. Flow pipe segmentation

[0208] 93 2. Flow pipe segmentation

[0209] 101 2. Circulation pipe section

[0210] 102 2. Interface

[0211] 112 Air diverter

[0212] 113 112 cavity

[0213] 114 101 free end

[0214] 116 Contact segment

[0215] 117 Contact segment

[0216] 121 1. Circulation pipe section

[0217] 124 Vertical Axis

[0218] 132 1. Interface

[0219] 133 Connecting pipe section

[0220] 134 Another connecting pipe section

[0221] 141 2. Circulation pipe section

[0222] 152 2. Interface

[0223] 153 Connecting pipe section

[0224] 154 Another connecting pipe section

[0225] 211 Respiratory Flow Sensor

[0226] 212 Flow tube

[0227] 213 Circulation Channel

[0228] 214 Vertical Axis

[0229] 218 212 free end

[0230] 221 1. Circulation pipe section

[0231] 222 Cylindrical pipe section

[0232] 223 Guide element

[0233] 224 212 open end

[0234] 226 Widening pipe section

[0235] 227 Flange

[0236] 227a 1. Connecting notch

[0237] 227b 1. Support structure

[0238] 232 1. Interface

[0239] 232a Supporting section of 232

[0240] 233 Connecting pipe section

[0241] 234 Another connecting pipe section

[0242] 235 Opening

[0243] 236 1. Tool opening

[0244] 238 1. Closure element

[0245] 239 pipe section

[0246] 241 2. Circulation pipe section

[0247] 242 Cylindrical pipe section

[0248] 243 Guide element

[0249] 244 Open End

[0250] 245 Free end of 241

[0251] 246 Widening pipe section

[0252] 247 Flange

[0253] 247a Another connection notch

[0254] 247b Another support structure

[0255] 252 2. Interface

[0256] 252a Support section of 252

[0257] 253 Connecting pipe section

[0258] 254 Another connecting pipe section

[0259] 255 Open

[0260] 256 2. Tool opening

[0261] 258 Closure element

[0262] 259 pipe section

[0263] γ Angle between 133 and 134

[0264] δ Angle between 153 and 154

Claims

1. A respiratory flow sensor comprising a flow tube (12; 212) having a longitudinal axis (14; 124; 214), a first flow tube section (21; 81; 121; 221) and a second flow tube section (41; 101; 141; 241), and having a flow resistance (61) arranged in the flow tube (12; 212) between the first flow tube section (21; 81; 121; 221) and the second flow tube section (41; 101; 141; 241). ), and further having an interface (32, 52; 82, 102; 132, 152; 232, 252) for reducing the pressure difference caused by the flow resistance (61), wherein the first interface (32; 82; 132; 232) is connected to the first flow pipe section (21; 81; 121; 221) through a first connecting pipeline, and the other interface (52; 102; 152; 252) is connected to the second flow pipe section (41; 101; 141; 241) through a second connecting pipeline, wherein, The first interface (32, 82, 132, 232) has a connecting line section (33, 83; 133, 233) of a first connecting line, which extends substantially parallel to the longitudinal axis (14; 124; 214) of the flow tube (12; 212), wherein the other interface (52, 102, 152, 252) has a connecting line section (53, 153, 253) of a second connecting line, which extends substantially parallel to the longitudinal axis (14; 124; 214) of the flow tube (12; 212), The openings (35, 55; 85; 235, 255) of the first interface (32, 82, 132, 232) and the other interface (52, 102, 152, 252) are adjusted in the same direction, characterized in that the first interface (32; 82; 132; 232) is arranged on the first flow pipe section (21; 81; 121; 221), and the other interface (52; 102; 152; 252) is arranged on the second flow pipe section (41; 101; 141; 241).

2. The respiratory flow sensor according to claim 1, characterized in that The first connecting line has a further connecting line section (34, 84; 134, 234) which at least partially extends straight and forms a first angle with a connecting line section (33, 83; 133, 233) of the first connecting line extending substantially parallel to the longitudinal axis (14; 124; 214) of the flow pipe (12; 212); The second connecting line has another connecting line section (54, 154, 254) which at least partially extends straight and forms a second angle with a connecting line section (53, 153, 253) of the second connecting line extending substantially parallel to the longitudinal axis (14; 124; 214) of the flow tube (12; 212).

3. The respiratory flow sensor according to claim 2, characterized in that: The first angle (α) is between 40° and 70°.

4. The respiratory flow sensor according to claim 3, characterized in that The first angle (α) is between 48° and 62°.

5. The respiratory flow sensor according to claim 4, characterized in that: The first angle (α) is between 52° and 58°.

6. The respiratory flow sensor according to claim 2 or 3, characterized in that: The second angle (β) is between 130° and 160°.

7. The respiratory flow sensor according to claim 6, characterized in that: The second angle (β) is between 138° and 152°.

8. The respiratory flow sensor according to claim 6, characterized in that: The second angle (β) is between 142° and 148°.

9. The respiratory flow sensor according to claim 1, characterized in that: Another interface (52; 102; 152; 252) is arranged adjacent to the first interface (32; 82; 132; 232).

10. The respiratory flow sensor according to claim 1, characterized in that: The first interface (32; 82; 132; 232) is at least partially arranged on the outer jacket surface of the first flow pipe section (21; 81; 121; 221), and / or the other interface (52; 102; 152; 252) is at least partially arranged on the jacket surface of the second flow pipe section (41; 101; 141; 241).

11. The respiratory flow sensor according to claim 1, characterized in that: The first flow pipe section (21; 81; 121; 221) and the second flow pipe section (41; 101; 141; 241) each have a substantially cylindrical pipe section (22, 42; 222, 242) and a radially widened pipe section (26; 226; 46, 246), wherein the radially widened pipe section (26; 226; 46, 246) is directed toward the respective first flow pipe section (21; 81; 121; 221) and the second flow pipe section (41; 101; 141; 241) 01; 141; 241) is enlarged at an open end (24, 224; 44, 244), a radially protruding flange (27, 227) with a contact surface is provided at the first open end (24, 224) of the first flow pipe section (21; 81; 121; 221), and a radially protruding flange (47, 247) with a contact surface is provided at the second open end (44, 244) of the second flow pipe section (41; 101; 141; 241).

12. The respiratory flow sensor according to claim 11, characterized in that A first connection recess (27a; 227a) is included on a radially widened pipe section (26; 226) of a first circulation pipe section (21; 81; 121; 221) for at least partially positioning another interface (52; 102; 152; 252) of a second circulation pipe section (41; 101; 141; 241), and / or another connection recess (47a; 247a) is included on a radially widened pipe section (46; 246) of the second circulation pipe section for at least partially positioning a first interface (32; 82; 132; 232) of the first circulation pipe section (21; 81; 121; 221).

13. The respiratory flow sensor according to claim 2, characterized in that: A first tool opening (36, 236) is provided to remove a forming tool for forming another connecting pipe section of the first connecting pipe, and a first closing element for closing another connecting pipe section of the first connecting pipe is arranged on the first flow pipe section; a second tool opening (56, 256) is provided to remove a forming tool for forming another connecting pipe section of the second connecting pipe, and a second closing element for closing another connecting pipe section of the second connecting pipe is arranged on the second flow pipe section.

14. The respiratory flow sensor according to claim 13, characterized in that A first closing element (38) is rotatably arranged on the first flow-through pipe section via a hinge, and / or a second closing element (58) is rotatably arranged on the second flow-through pipe section via a hinge.

15. The respiratory flow sensor according to claim 14, characterized in that: The first closing element (38) is rotatably arranged on the first flow tube section via a folding joint (39), and / or the second closing element (58) is rotatably arranged on the second flow tube section via a folding joint (59).

16. The respiratory flow sensor according to any one of claims 13 to 15, characterized in that: A groove (37, 57) / comb structure (40, 60) is provided on the tool opening (36, 56; 236, 256) and / or the closing element (38, 58; 238, 258), and the closing element (38, 58; 238, 258) is fixed to the corresponding flow pipe section (21, 41; 221, 241) by a sealing connection to close the tool opening (36, 56; 236, 256).

17. The respiratory flow sensor according to claim 16, characterized in that The closing element (38, 58; 238, 258) is fixed to the corresponding flow pipe section (21, 41; 221, 241) by ultrasonic welding to close the tool opening (36, 56; 236, 256).

18. A breathing adapter, comprising at least one breathing flow sensor (11) according to any one of claims 1 to 17 and at least one connecting hose (73, 74), the connecting hose being used to connect one of the interfaces (32, 52; 232, 252) of the breathing flow sensor (11) to a measuring device (76) to establish a fluid connection between the measuring device (76) and the breathing flow sensor (11), characterized in that: The fluid connection is located directly in the first flow tube section (21; 81; 121; 221) of the respiratory flow sensor (11), and the fluid connection does not require a docking point.

19. The breathing adapter according to claim 18, characterized in that At least one artificial breathing tube and a nozzle (78) are provided for the breathing adapter, wherein at least one artificial breathing tube (77) is connected between the nozzle (78) and at least one respiratory flow sensor (11).

20. A method for manufacturing a respiratory flow sensor (11) according to any one of claims 1 to 17, characterized by the following steps: a) forming a first flow pipe section (21; 81; 121; 221) and a second flow pipe section (41; 101; 141; 241) in a production tool mold, wherein a slide is used as a forming tool and / or a pin is used as a forming tool to form a connecting pipe section (33, 83, 133, 233) and a further connecting pipe section (34, 84, 134, 234) of a first connecting pipe, or a slide is used as a forming tool and / or a pin is used as a forming tool to form a connecting pipe section (53, 153, 253) and a further connecting pipe section (54, 154, 254) of a second connecting pipe, b) demoulding the first flow pipe section (21; 81; 121; 221) and the second flow pipe section (41; 101; 141; 241) from the corresponding production tool mold, c) aligning the first flow tube section (21; 81; 121; 221) and the second flow tube section (41; 101; 141; 241), i.e. aligning them with each other axially and with respect to their angular position, and d) Sealingly connecting the first flow pipe section (21; 81; 121; 221) and the second flow pipe section (41; 101; 141; 241).

Images