Device for producing and filling a bag with a butt-welded connection

Abstract

The invention relates to a device for producing and filling a bag for receiving a medical solution, in particular a dialysate, and / or a dry medical concentrate, comprising a control unit, a receiving area for a flat film which runs through a processing sequence of the device, a welding station which is designed to fix at least one connection to the flat film by means of butt-welding, a forming station which is designed to form a film tube from the flat film by folding in the flat film preferably using a forming shoulder, a sealing station which is designed to seal together two outer edges of the folded flat film in the running direction of the flat film, whereby a film tube is formed, a second sealing station which is designed to seal the film tube transversely to the longitudinal direction thereof and / or the running direction through the device, whereby at least one receiving pocket is formed in the film tube, and a filling station which is designed to fill at least one receiving pocket of the film tube in the longitudinal direction of the film tube, preferably in the vertical direction from above.

Description

[0001] Device for producing and filling a bag with a butt-welded connection

[0002] The present invention relates to a device for producing and filling a bag for containing a medical device or a medicament, preferably a medical solution, in particular dialysate, and / or a medical dry concentrate or a preparation for parenteral nutrition with at least one butt-welded connection, as well as to a bag produced by means of such a device.

[0003] Traditionally, pouches for medical solutions are produced by sealing two layers of film, with a variety of manufacturing machines being used in the production of such pouches.

[0004] The arrangement of connections, connectors or ports on such conventionally manufactured bags is usually carried out by intermediate storage of the connections between the two film layers of the bag and requires a rather complicated structure in which, for example, connectors with a special cross-sectional geometry, which are intended to enable a flush attachment of the film to the connector and thus a tight closure, are glued or welded between two film layers of a bag.

[0005] In the conventional production of bags for holding medical solutions, there is a high space requirement due to the number of production machines required and the need for special tools, for example for welding connectors with a special cross-sectional geometry.

[0006] Against this background, the present invention is based on the object of mitigating or even completely eliminating the problems of the prior art. In particular, the present invention is based on the object of creating a method for the efficient, cost-effective, and space-saving production of bags for containing medical solutions.

[0007] This object is achieved by a device having the features of claim 1. Furthermore, the present invention relates to a bag manufactured by means of a device according to the invention and to a bag system.

[0008] Advantageous further developments of the present invention are the subject of the subclaims.

[0009] The term 'medical device' includes medical solutions such as dialysis solutions for peritoneal or hemodialysis, substitution solutions, solutions for hemofiltration and preparations for parenteral nutrition.

[0010] Accordingly, a device for producing and filling a bag for containing a medical product, preferably a medical solution, in particular dialysate, and / or a medical dry concentrate, is provided, comprising:

[0011] - a control unit,

[0012] - a holder for a flat film which passes through a processing sequence of the device;

[0013] - a welding station designed to fix at least one connection to the flat film by butt welding;

[0014] - a forming station which is designed to form a film tube from the flat film by folding the flat film, preferably with a forming shoulder, - a sealing station which is designed to seal two outer edges of the folded flat film together in the running direction of the flat film, whereby a film tube is formed;

[0015] - a second sealing station designed to seal the film tube transversely to its longitudinal direction and / or running direction through the device, whereby at least one receiving pocket is formed and / or closed in the film tube; and

[0016] - a filling station which is designed to fill at least one receiving pocket of the film tube in the longitudinal direction of the film tube, preferably in the vertical direction from above.

[0017] One concept of the present invention is that the welding station of a device according to the invention is designed for butt welding. According to the invention, at least one connection of a bag to be produced is thus fixed to the film forming the bag by butt welding, and the connection is not sandwiched between two film layers of the bag as is conventional.

[0018] The welding station of a device according to the invention designed for butt welding is reflected in the structure of a bag manufactured by means of a device according to the invention: A bag manufactured by means of a device according to the invention has at least one side, preferably formed by a folded film, on which at least one connection is arranged by means of butt welding.

[0019] Attaching the connector to the side formed by a folded film preferably offers the advantage that the connector sits on an outermost layer of the folded film and is not integrated into the folded film or its layer structure or sandwiched between two layers of film that form a bag. Furthermore, the connector is preferably not arranged in the region of a sealing seam. Preferably, the term butt welding refers to a process in which two end faces (e.g., a connecting section of a hose section and a flat film) are butt-welded together in contact with one another. Butt welding is also known as mirror welding.

[0020] For example, the butt-welded connection can comprise a hose section. First, the hose section is widened, preferably in a tulip shape, on one end face to create a connection section with a larger end face, similar to a flange. The end face of the hose section is then placed on a surface, such as a film, and welded to it.

[0021] In this procedure, the end face of the tube section then sits on the surface of the film and is not integrated into it, for example in the case of a multi-layer film, it is arranged between the layers of the multi-layer film or sandwiched between two films.

[0022] Butt welding can be used to create particularly strong and resilient connections.

[0023] A plurality of connections can be arranged on the side of the bag formed by a folded film, at least one of which, preferably all of which, are arranged on the film by means of butt welding.

[0024] A further concept of the present invention is that all manufacturing steps, from the provision of a flat film to the final production of a bag for containing medical solution, are preferably carried out with a single machine or device according to the invention. This saves space during production.A device according to the invention is thus preferably designed to hold a flat film, insert it into these openings, for example by punching or using a hot mandrel, print the film, provide it with at least one connection by butt welding, fold the flat film over using a forming shoulder and then seal two longitudinal edges of the film together to form a film tube, divide the film tube into different receiving pockets by transverse sealing, optionally fill the receiving pockets, and then close the receiving pockets by transverse sealing, thereby creating completely closed chambers and then separating the chambers from one another along the transverse sealing seams to create separate bags. The control unit of a device according to the invention is preferably designed to control it to carry out one or more of these steps.

[0025] According to one embodiment, a welding station of a device according to the invention designed for butt welding comprises: at least one holding means, for example in the form of two movable holding jaws, for releasably holding a connecting section, for example a hose section, which is intended to be welded to the flat film; a preferably heatable pressure plate which is movable relative to the holding means, and a receiving area for the flat film between the holding means and the pressure plate, which is designed such that a flat film received in the receiving area is pressed by a relative movement of the pressure plate and / or the holding means with a connecting section held in the holding means and is butt-welded under the influence of heat and pressure.

[0026] Preferably, the control unit of a device according to the invention is programmed to move and control the holding means and / or the pressure plate relative to each other in such a way that a connecting section held in the holding means is pressed together with a film positioned in the receiving area for a specific period of time and at a specific temperature and a specific pressure, so that the connecting section is butt-welded to the film and forms a connection.

[0027] The control unit can be designed to control the device, in particular the welding station and / or a preforming station, to carry out at least one of the following steps:

[0028] Providing a cylindrical hose section, holding the hose section in the holding means, preforming a connection section of the hose section by locally expanding the hose, whereby a flange-like connection section is formed preferably by means of pressure and heat, preferably automatically inserting the flat film into a receiving area, placing the connection section onto the flat film, preferably by moving the connection section by means of the holding means and / or by moving the flat film by means of the pressure plate, wherein the flat film is intermediately stored between the connection section and the preferably heatable pressure plate, and welding the connection section to the flat film by pressing the connection section onto the flat film while exerting counterpressure by means of the pressure plate, whereby the connection section is connected to the flat film and forms a connection.

[0029] The control unit can be designed to control the welding station and / or a preforming station to form a flange-like connecting section of a hose section during preforming, wherein a thickness of the flange-like connecting section in the longitudinal direction of the hose section is between 0.1 mm and 2 mm, preferably between 0.3 mm and 0.5 mm and in particular approximately 0.4 mm, and a diameter of an end face of the flange-like connecting section is between 5 mm and 25 mm, preferably between 10 mm and 14 mm, and in particular 12 mm. The control unit can be designed to control the welding station to place a connecting section onto the flat film, wherein a temperature of the connecting section is at least partially between 200°C and 280°C.

[0030] The control unit can be designed to control the welding station to weld the connecting section to the flat film with a temperature of the pressure plate of 80°C to 150°C, preferably 90°C to 110°C for a period of time of 0.1 s to 4 s, preferably 1.5 s to 3.5 s and a pressure of 0.1 N / mm 2 up to 2 N / mm 2 , preferably 0.3 N / mm 2 up to 0.5 N / mm 2 to execute.

[0031] With a device according to the invention, bags for containing medicinal solution can be produced from a continuous strand or film tube. Filling of the bags preferably takes place vertically from above. A device according to the invention can therefore have a filling station similar to a vertical filler.

[0032] The control unit can thus be designed to control the device to continuously produce completely sealed chambers, each connected to one another via a sealing seam, along a continuous film tube, which are each separated from one another by cutting along a sealing seam running at right angles or substantially at right angles to the longitudinal direction and / or running direction of the film tube, whereby separate bags are produced, each having one or more chambers, which are either empty or at least partially filled by means of the filling station.

[0033] In this case, the chambers are preferably filled before final welding at a stage in which the chambers are only delimited at their lower end by a transverse seal and thus form receiving pockets that can be filled vertically from above. This eliminates the need to equip bags according to the invention with a filling port by means of which a bag is filled at the factory, i.e. before delivery to the end user. Such filling ports are usually permanently closed after filling, for example with a closure cap. By filling a receiving pocket that is not yet closed according to the invention, filling can be accelerated and simplified compared to the conventional filling of already fully formed bags by means of at least one filling port.

[0034] Single-chamber and / or multi-chamber bags can be manufactured using a device according to the invention. Multi-chamber bags preferably comprise at least two chambers connected to each other via an openable peel seam.

[0035] According to one embodiment of the present invention, the control unit is therefore designed to control the device to further produce a peel seam running in the longitudinal direction of the film tube in the film tube by means of a sealing station, which peel seam detachably connects two layers of film of the film tube to one another, whereby two receiving pockets arranged next to one another and separated by the peel seam are initially produced, which are each filled by the filling station, preferably by two separate filling lances, with a liquid, solid and / or pasty content which is designed for the production of dialysate.

[0036] Preferably, the two chambers of the multi-chamber bag contain two different contents. Preferably, only one of the two chambers of the multi-chamber bag has at least one butt-welded connection, and / or the other chamber has no connection, connector, or port, so that the contents of this chamber can only escape through the opened peel seam, the other chamber, and its connection. A device according to the invention can have a preforming station designed separately from the welding station for preforming the connection section of the tube section. However, this function can also be performed by the welding station.

[0037] The forming station of a device according to the invention preferably has a forming shoulder which is designed to fold the flat film over after butt welding of the at least one connection to the flat film to form a film tube, wherein the forming shoulder has at least one passage for the at least one connection, through which the connection passes when the film passes through the forming shoulder.

[0038] The structural design of the forming shoulder thus preferably represents the function that a flat film with at least one connection attached by butt welding is processed into a film tube and then into bags on a device according to the invention.

[0039] Since the butt welding preferably takes place before the film is folded or turned over by means of the forming shoulder, the forming shoulder has at least one passage for the at least one connection.

[0040] Since high hygiene requirements apply in the manufacture of medical products, such as the manufacture of bags for containing medical solutions, in particular dialysate or subcomponents of dialysate, the device can further comprise a sterilization station which is designed to sterilize a surface of the flat film and / or an interior of a bag formed from the flat film, preferably by means of radiation and / or application of a volatile disinfectant.

[0041] The sterilization station is preferably designed to sterilize a surface of the flat film which is intended to form a bag inner surface and is preferably arranged immediately before the forming shoulder of the forming station in the processing course of the device.

[0042] A further aspect of the present invention relates to a bag which is produced with a device according to the invention and has at least one side or edge formed by a folded flat film, to which at least one connection is fixed by butt welding.

[0043] Preferably, a bag according to the invention is provided as a single-use item or as a disposable and is made of a polymer material.

[0044] Furthermore, the present invention relates to a bag system for peritoneal dialysis, comprising at least one bag according to the invention. Preferably, two bags according to the invention are provided: a solution bag filled with ready-to-use dialysate and an initially empty drainage bag for receiving used dialysate.

[0045] Furthermore, the present invention relates to a bag system for preparations for parenteral nutrition, comprising at least one bag according to the invention.

[0046] At this point, it should be noted that the present disclosure is not limited to the explicitly mentioned combinations of features, but the features disclosed herein may also be claimed in other combinations or in isolation.

[0047] Further advantages, effects and features of the present invention will become apparent from the following description of preferred embodiments with reference to the drawings, in which like reference numerals designate like or similar components.

[0048] Herein: Fig. 1 shows a perspective view of a device according to the invention according to an embodiment;

[0049] Fig. 2 is a side view of the device from Fig. 1;

[0050] Fig.3 shows a bag system with two bags manufactured by means of a device according to the invention, and

[0051] Fig. 4 schematically shows a continuous production of bags when filling them in the vertical direction from above by means of a device according to the invention.

[0052] Fig. 1 shows a perspective view of a device 1 according to the invention with a storage area 2 for a flat film 3, which is held in the form of a roll and runs through a processing sequence of the device in Fig. 1 from left to right.

[0053] First, the film 3 passes through a station for forming an opening in the film 3, which in this embodiment is designed as a punching station 4.

[0054] In the punching station 4, a round opening 5 is punched into the film 3, which later allows the contents of the bag to escape from the bag through the connection in the area of ​​the butt-welded connection.

[0055] Alternatively, the opening 5 may be formed by means of a hot dome or any other method.

[0056] The film 3 then passes through a welding station 6, which is designed to fix at least one connection to the flat film 3 by butt welding. Fig. 1 shows a hose section 7, which is fixed to the film 3 by butt welding in the welding station 6.

[0057] After the welding station 6, the film 3 with a plurality of welded sections 7 according to the design shown in Fig. 1 runs via a deflection device 8 to a forming station 9, which is designed to form a film tube 12 from the flat film 3 by folding the flat film 3 with a forming shoulder 10.

[0058] Both the deflection device 8 and the forming shoulder 9 each have a passage 11 for the passage of the hose sections 7 or connections.

[0059] By means of a sealing station 13, two outer edges of the flat film 3 folded over by means of the forming shoulder 10 are sealed together in the running direction or longitudinal direction of the flat film 3, whereby a film tube 12 is formed.

[0060] The flat film 3 and the film tube 12 are moved through the device 1 by means of a drive.

[0061] Up to the deflection device 8, the flat film 3 preferably moves in a horizontal direction; after the forming station, the formed film tube 12 preferably moves in a vertical direction from top to bottom, as indicated by the arrow in Fig. 1.

[0062] By means of a sealing station 14, a sealing seam is formed in the film tube transversely to its longitudinal direction and / or running direction, whereby at least one receiving pocket is formed in the film tube 12 in the vertical direction above the transverse sealing seam. In other words, the film tube is preferably sealed transversely once, but remains open at the top to allow filling from above.

[0063] By means of a filling station 15, the at least one receiving pocket of the film tube 12 is then filled in the longitudinal direction of the film tube, preferably in the vertical direction from above. The filled film tube 12 is then moved vertically from top to bottom or in the running direction of the film tube, and a sealing station 16 forms a further sealing seam in the film tube transverse to its longitudinal direction and / or running direction, thereby closing the at least one receiving pocket in the film tube 12 and forming a sealed chamber with the filling material.

[0064] The sealing stations 14 and 16 can be designed as a single sealing station.

[0065] Finally, the chambers containing the contents are separated from each other by cutting them along the transverse sealing seams, creating separate bags.

[0066] Fig. 2 shows a side view of the device from Fig. 1. In this view, the longitudinal sealing seam 17 of the film tube 12 produced by means of the sealing station 13 as well as the transverse sealing seams 18 and 19 produced by means of the sealing stations 14 and 16 can be seen.

[0067] Fig. 3 shows a bag system 20 according to the invention for peritoneal dialysis with a bag 21 filled with a solution, for example with ready-to-use dialysate (also referred to as solution bag) and an empty bag 22 (also referred to as drainage bag), for example for receiving used dialysate.

[0068] According to the present embodiment, the solution bag 21 and the drainage bag 22 are preferably constructed identically.

[0069] The bags 21 and 22 each have a receiving area 23, which in the case of the solution bag 21 is preferably filled with fresh dialysate and in the case of the drainage bag 22 is initially empty but can be successively filled with used dialysate. The receiving area 23 of each bag 21 and 22 corresponds to a sealed chamber and is delimited on a first and a second opposite side 24 and 25 by a sealing seam. The sealing seams of the sides 24 and 25 are created, for example, by separating continuously formed chambers on a film tube 12 at the transverse sealing seams 18 and 19 of the film tube 12.

[0070] Each of the bags 21, 22 further comprises a third side 26 formed by a folded-over film, to which the connection or hose section 7 is permanently arranged by butt welding.

[0071] Opposite the third side 26, each of the bags 21, 22 has a fourth side 27 with the longitudinal sealing seam 17, in which preferably at least one hanging eyelet 28 is provided.

[0072] Each of the bags 21 and 22 is preferably produced from a flat film by folding the film on the third side 26 and sealing the outer edges of the flat film together on the fourth side 27 to form the sealing seam 17 by means of a device 1 according to the invention, whereby a film tube 12 is initially formed.

[0073] A transverse sealing seam 18 is then formed transversely to a longitudinal direction of the film tube, which delimits the first side 24 of each bag 21, 22.

[0074] In this intermediate state, the receiving area 23 is still open on its side 25 opposite the first side 24 of each bag 21, 22, and can thus be easily filled if desired. The bag can also remain empty.

[0075] The need for a filling port on the solution bag 21 is thus eliminated. After filling the receiving area 23, the transverse sealing seam 19 provided on the second side 25 of the bag is created, thereby closing the receiving area 23 of each bag 21, 22.

[0076] The tubing sections 7 of the bags 21 and 22 are connected to a three-way valve 29, which is connected to a patient connector 30. This allows fresh dialysate from the solution bag to be supplied to a patient, and used dialysate from the patient to be supplied to the drainage bag.

[0077] Fig.4 shows an example of a continuous production of bags from a continuous film tube 12, which can be used within the scope of the present invention and can be carried out by a device according to the invention.

[0078] The film tube 12 shown in Fig. 4 preferably extends in the vertical direction during the filling shown in Fig. 4.

[0079] The film tube 12 was produced from a flat film 3 by folding the film 3 and sealing the outer edges of the flat film together in the sealing seam 17.

[0080] In the view shown in Fig. 4, the film tube 12 comprises four bags, namely two solution bags 21 (one of which is already filled and sealed and one (top bag in Fig. 4) is currently being filled) and two drainage bags 22 (whose receiving area 23 is empty).

[0081] The solution bags 21 and drainage bags 22 are arranged alternately in the longitudinal direction of the film tube 12. However, this arrangement is merely exemplary; it is equally conceivable to provide only (filled) solution bags 21 or only drainage bags 22 within a film tube 12. If solution bags 21 and drainage bags 22 are provided within a film tube 12, their arrangement relative to one another is arbitrary.

[0082] The term "solution bag" does not necessarily mean that the bag contains a solution. A medical solution, such as dialysate, is merely an example, and a "solution bag" can contain any other medical content, for example, a paste or dry concentrate.

[0083] In the view of the film tube 12 shown in Fig. 3, the bags 21 and 22 are not yet separated from each other, but are each connected to each other by a common transverse sealing seam (seams 18 and 19 in Fig. 2) on the sides 24 and 25.

[0084] The folded side of the flat film 3 forms the third side 26 (left in Fig. 4) of each bag 21, 22 and the sealing seam 17 forms the fourth side 27 of each bag 21, 22.

[0085] Each bag 21, 22 is provided with at least one butt-welded connection 7 on its third side 26.

[0086] The topmost bag shown in Fig. 4 illustrates the filling of the receiving area 23 of a solution bag 21 by means of the filling station 15 in a vertical direction from above. In this bag 21, the receiving area 23 is not yet closed or sealed at its upper end shown in Fig. 4 and therefore forms a receiving pocket 31 for the filling material.

[0087] The receiving pocket 31 is filled with a specific content, for example, the dialysate indicated by hatching, preferably vertically from above using a dedicated filling device, e.g., a filling lance 32 of the filling station 15. Once the receiving pocket 31 is sufficiently filled, it is closed by transverse sealing at its upper end.

[0088] This filling method eliminates the need to equip each solution bag 21 with a filling port. Furthermore, the filling speed can be increased compared to conventional filling using a filling port.

[0089] In order to separate the individual bags 21, 22 of the continuous film tube 12 from one another, they are cut apart in the transverse direction along the common transverse sealing seam on the sides 24, 25.

[0090] The bags 21 and 22 can now be used within the framework of a bag system according to the invention.

Claims

Device for producing and filling a bag with a butt-welded connection Claims 1. Device for producing and filling a bag for containing a medical product, preferably a medical solution, in particular dialysate, and / or a medical dry concentrate, comprising: a) a control unit, b) a holder for a flat film which runs through a processing sequence of the device; c) a welding station which is designed to fix at least one connection to the flat film by butt welding; d) a forming station which is designed to form a film tube from the flat film by folding the flat film, preferably with a forming shoulder, e) a sealing station which is designed to seal two outer edges of the folded flat film together in the running direction of the flat film, whereby a film tube is formed;f) a second sealing station designed to seal the film tube transversely to its longitudinal direction and / or running direction through the device, whereby at least one receiving pocket is formed in the film tube; and; g) a filling station which is designed to fill at least one receiving pocket of the film tube in the longitudinal direction of the film tube, preferably in the vertical direction from above.

2. Device according to claim 1, characterized in that the welding station has: at least one holding means for releasably holding a connecting section which is intended to be welded to the flat film; a preferably heatable pressure plate which is movable relative to the holding means, and a receiving area for the flat film between the holding means and the pressure plate, which is designed such that a flat film received in the receiving area can be pressed and butt-welded to a connecting section held in the holding means by a relative movement of the pressure plate and the holding means.

3. Device according to claim 1 or 2, characterized in that the control unit is programmed to move and control the holding means and / or the pressure plate relative to each other in such a way that a connection section held in the holding device is pressed together with a film positioned in the receiving area for a certain period of time and at a certain temperature and a certain pressure, so that the connection section is butt-welded to the film and forms a connection.

4. Device according to one of the preceding claims, characterized in that the control unit is designed to control the device, in particular the welding station and / or a preforming station, to carry out at least one of the following steps: providing a cylindrical hose section, preforming a connecting section of the hose section by locally expanding the hose, whereby preferably by means of pressure and heat a flange-like connecting section is formed, preferably automatically inserting the flat film into a receiving area, placing the connecting section onto the flat film so that the flat film is intermediately stored between the connecting section and a heatable pressure plate, and welding the connecting section to the flat film by pressing the connecting section onto the flat film while exerting counterpressure by means of the pressure plate, whereby the connecting section is connected to the flat film by butt welding and forms a connection.

5. Device according to one of the preceding claims, characterized in that the control unit is designed to control the welding station and / or a preforming station to form a flange-like connecting section of a hose section during preforming, wherein a thickness of the flange-like connecting section in the longitudinal direction of the hose section is between 0.1 mm and 2 mm, preferably between 0.3 mm and 0.5 mm and in particular approximately 0.4 mm, and a diameter of an end face of the flange-like connecting section is between 5 mm and 25 mm, preferably between 10 mm and 14 mm, and in particular 12 mm.

6. Device according to one of the preceding claims, characterized in that the control unit is designed to control the welding station to carry out a placement of a connecting section on the flat film, wherein a temperature of the connecting section is at least partially between 200°C and 280°C.

7. Device according to one of the preceding claims, characterized in that the control unit is designed to control the welding station to weld the connecting section to the flat film with a temperature of the pressure plate of 80°C to 150°C, preferably preferably from 90°C to 110°C for a period of 0.1 s to 4 s, preferably from 1.5 s to 3.5 s and a pressure of 0.1 N / mm 2 up to 2 N / mm 2 , preferably 0.3 N / mm 2 up to 0.5 N / mm 2 to execute.

8. Device according to one of the preceding claims, characterized in that the control unit is designed to control the device to continuously produce completely closed chambers, each connected to one another via a sealing seam, along a continuous film tube and to separate these from one another by separating them along a sealing seam running at right angles or substantially at right angles to the longitudinal direction and / or running direction of the film tube, whereby separate bags are produced, each having one or more chambers, which are either empty or at least partially filled by means of the filling station.

9. Device according to one of the preceding claims, characterized in that the control unit is designed to control the device to further produce a peel seam running in the longitudinal direction in the film tube by means of a sealing station, which peel seam detachably connects two layers of the film tube to one another, whereby two receiving pockets arranged next to one another and separated by the peel seam are produced, which are each filled by the filling station, preferably by two separate filling lances, with a liquid, solid and / or pasty content which is designed for the production of dialysate.

10. Device according to one of the preceding claims, characterized in that a preforming station formed separately from the welding station is provided for preforming the connecting section of the hose section.

11. Device according to one of the preceding claims, characterized in that the forming station has a forming shoulder which is designed to fold the flat film after butt welding of the at least one connection to the flat film to form a film tube, wherein the forming shoulder has at least one passage for the at least connection, through which the connection passes when the film passes through the forming shoulder.

12. Device according to one of the preceding claims, characterized in that the device further comprises a sterilization station which is designed to sterilize a surface of the flat film or an interior of a bag formed from the flat film, preferably by means of radiation and / or application of a volatile disinfectant.

13. Device according to claim 12, characterized in that the sterilization station is designed to sterilize a surface of the flat film and is arranged in the processing course of the device immediately before the forming shoulder of the forming station.

14. A bag produced with a device according to any one of the preceding claims and having at least one side or edge formed by a folded flat film to which at least one connection is fixed by butt welding.

15. Bag system for peritoneal dialysis, comprising at least one bag according to claim 14.

Images