Bag which is filled with a medical fluid, and method for producing same

Abstract

The invention relates to a bag which is filled with a medical fluid and which is made from two films which are sealed along a bottom cross-seam, a top cross-seam, a first longitudinal seam, and a second longitudinal seam At least one extraction port is provided in the bottom cross-seam. The bag is divided into at least a first chamber, a second chamber, and a third chamber by a first peel seam and a second peel seam. The first peel seam comprises a first curved tear zone, and the second peel seam comprises a second curved tear zone. The first tear zone, starting from the bottom cross-seam, is positioned higher than the second tear zone.

Description

Field of the invention The invention relates to a bag filled with a medical fluid. In particular, the invention relates to a three-chamber bag with an enteral or parenteral nutritional composition. The invention further relates to a method for producing a medical bag. Background of the invention Film bags are often used for enteral or parenteral nutritional compositions. A film bag of this kind is provided with at least one withdrawal port. It can be pierced with a spike or a needle such that the nutritional composition can be transferred to the patient by means of a transfer set. Nutritional compositions of this kind generally comprise a glucose-containing solution, an amino acid-containing solution and a fat emulsion. However, these components can only be stored separately from one another for a longer period of time. The published patent application WO 2006 / 010410 A1 (Applicant: Fresenius Kabi Deutschland GmbH) shows a three-chamber bag made of films welded to one another. The bag is divided into three chambers via peel weld seams. The largest chamber, which is usually filled with the glucose-containing solution, extends via the other two chambers in the upper region of the bag. The peel weld seams are weld seams which, when pressure is applied to the bag, in particular by rolling up the bag, in particular laterally, preferably from top to bottom, tear open such that the contents of the three chambers can mix. The medical bag described in the above document comprises peel seams with an S-shaped zone which assists the initial tearing-open of the peel weld seams. Peel weld seams differ from other or permanent weld seams in that the material is less strongly liquefied during welding, for example due to a lower welding temperature and / or a shorter contact time. On the one hand, the peel weld seams must be sufficiently stable such that the peel weld seams are not unintentionally torn open during transport of the bag, thereby opening the chambers. On the other hand, however, the peel weld seams should also be designed in such manner that the user does not have to exert excessive force, e.g. when rolling the bag, to exert sufficient pressure to open the peel weld seams. It has been shown that it is more difficult, in particular in the case of relatively small medical bags, to provide peel weld seams with good tear-open properties. In particular, for paediatric applications, the volume of medical fluid in the bag is lower, usually below 2000 ml. The peel weld seams should open when the bag is rolled up downwards, i.e. up to the lower transverse weld seam in which the withdrawal port is located. This is the only way to ensure that the various components of the nutritional composition are well mixed. This is particularly important for paediatric applications, as the contents of the bag may also only be partially used. Object of the invention The object underlying the invention is to provide a multi-chamber bag, in particular a three-chamber bag, which has an improved tear-open behaviour of the peel weld seams. The multi-chamber bag is intended in particular for paediatric applications. Summary of the invention The object of the invention is already achieved by a bag filled with a medical fluid and by a method for producing a bag filled with a medical fluid according to one of the independent claims. Preferred exemplary embodiments and further developments of the invention can be found in the subject matter of the dependent claims, the description and the drawings. The invention relates to a bag which is filled with a medical fluid and which is formed from two films which are welded to one another with a lower transverse weld seam and an upper transverse weld seam and with a first longitudinal weld seam and a second longitudinal weld seam, wherein at least one withdrawal port is arranged in the lower transverse weld seam, wherein the bag is divided by a first peel weld seam and a second peel weld seam into at least one first chamber, one second chamber and one third chamber, wherein the first peel weld seam comprises a first curved tear-open zone and the second peel weld seam comprises a second curved tear-open zone, and wherein the first tear-open zone, starting from the lower transverse weld seam, is arranged higher than the second tear-open zone. According to independent claim 1, the invention will be described as follows by a bag which is filled with a medical fluid and which is formed from two films which are welded to one another with a lower transverse weld seam and an upper transverse weld seam and with a first longitudinal weld seam and a second longitudinal weld seam, wherein at least one withdrawal port is arranged in the lower transverse weld seam, wherein the bag is divided by a first peel weld seam and a second peel weld seam into at least one first chamber, one second chamber and one third chamber, wherein the first peel weld seam comprises a first curved tear-open zone and the second peel weld seam comprises a second curved tear-open zone, wherein the first peel weld seam, starting from the lower transverse weld seam, has a lower straight section which merges via the first curved tear-open zone into an upper straight section, wherein the upper straight section runs via a third curve to the second longitudinal weld seam via a straight region, wherein the second peel weld seam, starting from the lower transverse weld seam, has a first lower straight section which merges via the second curved tear-open zone into an upper straight section which ends in the straight region of the first peel weld seam, and wherein the first curved tear-open zone of the first peel weld seam, starting from the lower transverse weld seam, is arranged higher than the second curved tear-open zone of the second peel weld seam. The invention is based on the finding that, via a first peel weld seam which comprises a curved tear-open zone which is located higher than a second tearopen zone of the second peel weld seam with respect to the lower transverse weld seam, the first peel weld seam can be opened up to the lower transverse weld seam during intended use before the second transverse weld seam begins to tear open. This makes it possible, in a simple manner, to only optionally use the composition in the third chamber, which is only opened by tearing open the second peel weld seam. The first peel weld seam is designed in particular in such manner that it starts further to the right at the lower transverse weld seam than the second peel weld seam. In particular, a turning point of the first peel weld seam, starting from the lower transverse weld seam, is located higher than a turning point of the second peel weld seam. Furthermore, the start of the first curved tear-open zone is preferably located higher than a start of the second tear-open zone. The start of a tear-open zone is thereby defined in particular by the fact that a straight section of the first and second peel weld seam merges into a curve. In one embodiment of the invention, the turning point of the first tear-open zone of the first peel weld seam, starting from the lower transverse weld seam, is located 5 - 150 mm, preferably 10 - 30 mm, particularly preferably 15 - 25 mm, higher than the turning point of the second tear-open zone of the second peel weld seam. In a preferred embodiment of the invention, the first curved tear-open zone and / or the second curved tear-open zone is formed from a first curve which merges into a second opposite curve. The first and second curves can in particular be in the form of a quarter circle and / or a 90° arc or curve. In a further development of the invention, the first curve has a smaller inner radius and / or a smaller outer radius than the second curve. In this embodiment of the invention, preferably during intended use of the bag by rolling from top to bottom, in particular by rolling from top right to bottom left, the force acting on the first or second peel weld seam is greatest at the first curve, which is narrower than the second curve, such that the first or second peel weld seam begins to tear open at the first curve. The tearing-open of the first and / or the second peel weld seam then continues downwards up to the lower transverse weld seam. This ensures that the components of the first and second chambers, and optionally of the third chamber, are mixed evenly. The first peel weld seam is designed in particular in such manner that it has a lower straight section. In one embodiment, the lower straight section starts from the lower transverse weld seam and extends upwards, in particular substantially parallel, preferably parallel, to the longitudinal weld seams. The lower straight section then merges via the first tear-open zone into an upper straight section. In particular, this upper straight section also runs substantially parallel, preferably parallel, to the longitudinal weld seams. The upper straight section then runs via a third curve to the second longitudinal weld seam. The third curve provides a left curve. The third curve is in particular in the form of a 90° curve and / or a quarter circle. After the third curve, the first peel weld seam runs transversely to the upper straight section of the first peel weld seam. In particular, after the third curve, the first peel weld seam runs via a straight region which runs substantially parallel, preferably parallel, to the lower transverse weld seam and / or to the upper transverse weld seam, up to the second longitudinal weld seam. In one embodiment, the second peel weld seam comprises a first lower straight section which runs, in particular substantially parallel, preferably parallel, to the longitudinal weld seams. The lower straight section starts from the lower transverse weld seam and initially runs upwards up to the second tear-open zone. The second tear-open zone then merges into an upper straight section, which ends or opens in the first peel weld seam. The upper straight section of the second peel weld seam runs, in particular substantially parallel, preferably parallel, to the longitudinal weld seams. In particular, the second peel weld seam ends or opens in the, preferably horizontal, straight region of the first peel weld seam. The bag is thus divided into three chambers, wherein the first chamber extends from the lower transverse weld seam up to the upper transverse weld seam and via the second chamber and the third chamber. The first chamber is therefore in particular angular in shape, wherein one leg, in particular on the right, extends from the lower transverse weld seam up to the upper transverse weld seam. The other leg extends from the first longitudinal weld seam up to the second longitudinal weld seam and thus in sections via the second chamber and the third chamber. The second chamber and the third chamber preferably extend over one third to two thirds of the height of the first chamber. Preferably, in the lower transverse weld seam are arranged two, in particular three, ports, each of which is connected to one of the three chambers. The ports can be used to fill the chambers of the medical bag. At least one first port is provided, which is in the form of a withdrawal port. It can comprise a sealing element which can be pierced by means of a needle or a spike, in particular what is known as a stopper, in order to be able to withdraw the medical fluid and transfer it to the patient, for example via a delivery system. A second port can be in the form of an injection port. It also comprises a pierceable sealing element, in particular what is known as a septum, through which, for example, medicines or additives can be transferred into the bag by means of a syringe. Lastly, there may also be a third port, which is preferably in the form of a blind port. It is used only for filling a chamber of the bag and is closed with a stopper and a cap. The withdrawal port and / or the injection port are preferably in the form of connectors. The connector on the withdrawal port is used to connect a transfer set, for example by opening the withdrawal port by means of a spike of the transfer set. At the injection port, a pharmaceutical and / or an additive can be transferred into the bag, for example, using a needle syringe. The injection port can also be in the form of a threadless Luer connection or a Luer lock connection with a thread, and can be used with a suitable syringe, e.g. a Luer or Luer lock syringe. The bag is preferably arranged sterile in a secondary package. In particular, the bag is arranged in a tear-open bag. According to one embodiment of the invention, the bag is filled with 500 -2000 ml of medical fluid, in particular with 800 - 1200 ml, preferably with 900 -1100 ml or with 1300 - 1700 ml, preferably with 1400 - 1600 ml, of medical fluid. Within the meaning of the invention, this is understood to mean the total amount of medical fluid in the three chambers. The bag is preferably designed in such manner that when the bag is rolled up from top to bottom, in particular from top right to bottom left or laterally, the first peel weld seam in the region of the first tear-open zone initially begins to tear open. Furthermore, the bag is preferably designed in such manner that, when the bag is rolled up from top to bottom, in particular from top right to bottom left, the first peel weld seam tears open during intended use up to the lower transverse weld seam, in particular wherein only after that does the second peel weld seam begin to tear open at the second tear-open zone. This allows the component of the third chamber to be used only optionally. The right and left sides of the bag are defined in particular by the bag being placed with its rear side on a table. The peel seams of the bag are preferably opened by rolling up the bag from top right to bottom left. Here, in particular, the upper side of the bag is defined by the position of the hanger and the hanging of the bag on a stand via its hanger. In one embodiment of the invention, the bag has a ratio of height h to width w of 0.7 - 1.5, preferably of 0.8 - 1.2. In particular, in a further embodiment, the bag can have a ratio of h to w of 1.0 - 1.2 or of 0.8 - 1.0. The first curve of the first peel weld seam and / or the second peel weld seam can have an inner radius of 2 - 4 mm and / or an outer radius of 8 - 12 mm. The second curve of the first peel weld seam and / or the second peel weld seam can have an inner radius of 10 - 16 mm and / or an outer radius of 15 - 20 mm. As described above, the tear-open zone of the first peel weld seam and / or the second peel weld seam is more strongly curved at the first curve than at the second opposite curve. The tearing-open of the peel weld seam therefore preferably begins in the region of the first curve. In one embodiment of the invention, the first tear-open zone has the same course as the second tear-open zone. According to one embodiment of the invention, the first curve of the first tear-open zone begins at a distance of 50 - 70 mm from the lower transverse weld seam. According to one embodiment of the invention, the first curve of the second tear-open zone begins at a distance of 35 - 45 mm from the lower transverse weld seam. In one embodiment, the peel weld seams have a width of 5 to 9 mm, in particular of 6 to 8 mm. The first chamber is preferably filled with a glucose component. The first chamber can contain 0.4 - 0.7 times, in particular 0.5 - 0.7 times, the volume of the medical fluid. The second chamber is preferably filled with an amino acid component. The second chamber can contain 0.2 to 0.4 times, in particular 0.35 to 0.4 times, the volume of the medical fluid. The third chamber is preferably filled with a fat component, in particular a fat emulsion. The third chamber can contain 0.05 to 0.15 times, in particular 0.08 to 0.14 times, the volume of the medical fluid. Preferably, in addition to the medical fluid, there is a gas volume located in the chambers, in particular an inert gas, such as nitrogen. Since the gas volume is compressible, impacts are better absorbed. The likelihood of the bag bursting, for example if it falls, is reduced. In particular, at least the first, second and / or third chamber can contain 5 - 20 ml of gas. The films of the bag are preferably in the form of multi-layer polyolefin films. The films are in particular in the form of multi-layer polypropylene films. At least one layer of the film, in particular all layers of the film, can be in the form of a matrix-phase polymer system. In a matrix-phase polymer system, there are at least two different polymers present, wherein one polymer is present in the matrix of the other polymer in a demixed state, in particular as dispersed, solidified droplets. The matrix polymer of the matrix-phase polymer system of the inner layer, the middle layer and the outer layer each comprises a polypropylene polymer. In particular, the matrix consists of polypropylene. The phase polymer of the matrix-phase polymer system of the inner layer, the middle layer and the outer layer can each comprise at least one styrene-ethylene / butylene-styrene block copolymer (SEBS) as the phase polymer. SEBS is a block polymer which is composed of styrene, butylene and ethylene segments and which comprises a hydrogenated butadiene segment followed by styrene groups. This is produced in particular by polymerising a styrene and butadiene monomer and then hydrogenating the previously polymerised SBS. The hydrogenated butadiene forms a soft middle block between styrene blocks. The SEBS forms a bond with the PP matrix polymer. By way of a multi-layer system of this kind, by using other components and / or compositions in the respective layers, highly transparent and at the same time very tear-resistant films can be provided, which can be easily welded to form a bag. The first and / or second peel weld seam(s) is / are designed in one embodiment of the invention in such manner that the films of a 30 mm long straight strip separate from one another at a force of between 15 and 50 N, preferably between 20 and 30 N. A 30 mm wide cutout is cut out along a straight section of the peel weld seam. The films are pulled apart on one side of the strip and the maximum force required to separate the strips is measured by means of a force measuring device. According to one embodiment, the bag does not comprise an inner bag. Preferably, no further bags, for example small, bags are arranged or introduced in the chambers of the bag. They are each free of an inner bag. In particular, the bag comprises exactly three chambers or at least three chambers, which are formed from exactly two films welded to one another. The bag is designed in particular for paediatric applications. The invention further relates to a method for producing a bag filled with a medical fluid, comprising the steps: - Providing a first and a second film; - Welding the first and second films to form the bag, wherein at least one withdrawal port is welded in a lower transverse weld seam, - Dividing the bag into three chambers by welding a first peel weld seam with a first curved tear-open zone and a second peel weld seam with a second curved tear-open zone, wherein the first tear-open zone is arranged higher than the second tear-open zone with respect to the lower transverse weld seam. According to independent claim 18, the invention will be described by a method for producing a bag filled with a medical fluid, comprising the steps: - Providing a first and a second film; - Welding the first and second films to form the bag, wherein at least one withdrawal port is welded in a lower transverse weld seam, - Dividing the bag into three chambers by welding a first peel weld seam with a first curved tear-open zone and a second peel weld seam with a second curved tear-open zone, wherein the first peel weld seam, starting from the lower transverse weld seam, has a lower straight section which merges via the first curved tear-open zone into an upper straight section, wherein the upper straight section runs via a third curve to the second longitudinal weld seam via a straight region, wherein the second peel weld seam, starting from the lower transverse weld seam, has a first lower straight section which merges via the second curved tear-open zone into an upper straight section which ends in the straight region of the first peel weld seam, and wherein the first curved tear-open zone of the first peel weld seam, with respect to the lower transverse weld seam, is arranged higher than the second tear-open zone of the second peel weld seam. Preferably, at least one second longitudinal weld seam is welded, wherein the first peel weld seam and / or the second peel weld seam is / are welded after welding the lower transverse weld seam and / or after welding at least the second longitudinal weld seam. In particular, it is provided that the peel weld seams are welded after welding the longitudinal and transverse weld seams. The peel weld seams therefore overlap with the respective longitudinal and transverse weld seam, at which the respective peel weld seam ends. This ensures that there is no weakened zone of the respective transverse or longitudinal weld seam in the region of the overlap. In the overlap region, only an imprint of the overlapping peel weld seam is present on the transverse or longitudinal weld seam. After welding the transverse weld seam and the peel weld seams, in particular after welding all weld seams, the chambers of the bag are filled with medical fluid via respectively one port. At least the lower transverse weld seam and the peel weld seams are preferably welded by means of a contact welding method. In a contact welding method of this kind, a welding tool is pressed against the film layers, the welding tool having a heatable sealing bar that corresponds to the contour of the respective weld seam. The contact time and the temperature, as well as the pressure of the sealing bar on the weld seam, can be used to determine whether it is a peel weld seam or a non-tear-open longitudinal or transverse weld seam. In the case of the peel weld seams, the material is in particular less liquefied such that they are designed in such manner that they can tear open when targeted pressure is applied to the bag. In particular, the bag is rolled up for this purpose. The bag is preferably rolled up from top to bottom. In one embodiment, the bag is rolled up laterally from top right to bottom left. After filling and closing the ports, the bag is preferably packaged in a secondary package and sterilised in the secondary package. The secondary package can in particular be in the form of a tear-open bag, i.e. a bag with films welded to one another. The films of the tear-open bag preferably comprise an oxygen barrier layer, in particular a metal or metal oxide layer. The bag packaged in the secondary package is preferably sterilised by autoclaving. Brief description of the drawings The subject matter of the invention will be explained in more detail below with reference to exemplary embodiments on the basis of the drawings Fig. 1 to Fig. 4. Fig. 1 shows an exemplary embodiment of a bag according to the invention filled with a medical fluid. Fig. 1a is a detailed view of a tear-open zone. Fig. 2 shows the bag arranged in a secondary package. Fig. 3 shows a further exemplary embodiment of a bag filled with a medical fluid. Fig. 4 is a flow diagram of an exemplary embodiment of the method according to the invention for producing a medical bag. Detailed description of the drawings Fig. 1 shows an exemplary embodiment of a bag 10 filled with a medical fluid. The bag 10 is represented in the unfilled state. Information on size ratios and the course of the weld seams refers by definition to the unfilled bag 10. The bag 10 is formed from two films welded to one another. The films are welded to one another via a lower transverse weld seam 11a, an upper transverse weld seam 11b, a first longitudinal weld seam 12a represented here on the right, and a second longitudinal weld seam 12b represented here on the left. The bag 10 is rectangular in shape. In the upper transverse weld seam 11b there is located a hanger 13 for attaching or hanging the bag 10 on a rack or stand. The hanger 13 is here in the form of an arcuate cut. Above the hanger 13 is also arranged a punched-out portion, which is used as a handle 16 for carrying the bag 10. The upper transverse weld seam 11b widens in the region of the hanger 13 and the handle. The bag 10 is divided into a first chamber 16a, a second chamber 16b and a third chamber 16c via a first peel weld seam 14, arranged here on the right, and a second peel weld seam 15, arranged here on the left. According to this exemplary embodiment, the bag 10 is filled with a total of 800 - 1200 ml, preferably 900 - 1100 ml, of a medical fluid. The first chamber 16a is preferably filled with a glucose solution. The second chamber 16b is preferably filled with an amino acid-containing solution. The third chamber 16c is preferably filled with a fat emulsion. The first chamber 16a is preferably filled with 550 - 630 ml. The second chamber 16b is preferably filled with 300 - 350 ml. The third chamber 16c is preferably filled with 85 - 130 ml. The second chamber 16b and / or the third chamber 16c preferably have a height of 155 - 175 mm (measured between the lower transverse weld seam 11a and the section 14e). The first chamber 16a above the third chamber 16c preferably has a height of 110 - 130 mm (measured between the section 14f and the straight region of the upper transverse weld seam 11b). The first chamber 16a has a width of preferably 50 - 70 mm in the lower straight section 14a (measured between the section 14a and the right longitudinal weld seam 12a). The second chamber 16b has a width of preferably 145 - 165 mm in the lower straight section 14a / 15a (measured between the section 14a and the section 15a). The third chamber 16c has a width of preferably 80 - 100 mm in the lower straight section 15a (measured between the section 15a and the left longitudinal weld seam 12b). Three ports 20a - 20c are arranged in the lower transverse weld seam 11a. The ports 20a - 20c are each closed with an upper part 23, which is placed on a lower part 21. There is located a seal (not represented) between the lower part 21 and the upper part 23 in each case. The port 20a is connected to the first chamber 16a and is in the form of a withdrawal port 20a. The port 20b is in the form of an injection port 20b. The withdrawal port 20a and the injection port 20b each comprise an upper part 23, which is provided with a break-off cap 24. After breaking off the break-off cap 24, the seal can be pierced with a spike or a needle in order to withdraw fluid from the bag or to dose it into the bag. The port 20c is in the form of a blind port and is only used to fill the third chamber 16c. Accordingly, it is only closed with an upper part 23 in the form of a cap, wherein a seal is also arranged between the cap and the lower part 21 of the port 20c. The lower part 21 each comprises a weld-in section 22, with which the respective port 20a to 20c is welded in the lower transverse weld seam 11a. The ports 20a - 20c are preferably each spaced 90 to 130 mm, in particular 90 to 110 mm, apart (centre of port to centre of port). The ratio of height h to width w of the bag 10 is 0.85 - 1.0 in this exemplary embodiment. Preferably, the bag 10 has a width w of w = 310 - 350 mm and / or a length or height h of h = 285 - 330 mm. The bag 10 is divided into the three chambers 16a - 16c by a first peel weld seam 14 and a second peel weld seam 15. The first peel weld seam 14 starts at the lower transverse weld seam 11a between the ports 20a and 20b, runs upwards and then up to the second longitudinal weld seam 12b. Accordingly, the first chamber 16a extends to the right from the lower transverse weld seam 11a up to the upper transverse weld seam 11b and extends, adjoining via the second chamber 16b and the third chamber 16c, up to the second longitudinal weld seam 12b. The first chamber 16a is therefore in the form of an angle. The first peel weld seam 14 begins with a lower straight section 14a, which preferably runs parallel to the longitudinal weld seams 12a, 12b. This is adjoined by the first curved tear-open zone A1. The tear-open zone A1 is formed from a first curve 14b, which merges into a second opposite curve 14c. The curve 14b runs more tightly than the curve 14c. The first peel weld seam 14 therefore makes an approximately S-shaped offset at the first tear-open zone A1 in the direction of the second peel weld seam 15. Starting from the first tear-open zone A1, an upper straight region 14d extends upwards, which also preferably runs parallel to the longitudinal weld seams 12a, 12b. The first peel weld seam 14 then merges via a third curve 14e into a horizontal straight section 14f, which runs up to the second longitudinal weld seam 12b. The second peel weld seam 15 lies between the port 20b and the port 20c and starts at the lower transverse weld seam 11a. The second peel weld seam 15 also comprises a lower straight section 15a, which merges via the second curved tear-open zone A2 into an upper straight section 15d. The lower straight section 15a and the upper straight section 15d preferably run parallel to the longitudinal weld seams 12a, 12b. The upper straight section 15d runs up to the horizontal straight section 14f of the first peel weld seam 14. Starting from the intersection point of the first peel weld seam 14 with the second peel weld seam 15, part of the horizontal straight section 14f of the first peel weld seam 14 is thus used to close the third chamber 16c. It goes without saying that, by definition, this region could also be formed as part of the second peel weld seam 15. The first peel weld seam 14 and the second peel weld seam 15 can in particular also be formed with a single welding tool, the sealing bars of which are arranged according to the arrangement of the peel weld seams 14, 15. Due to the opposite curves 14b, 14c, 15b, 15c, the first tear-open zone A1 comprises a turning point W1 and the second tear-open zone A2 comprises a turning point W2. According to the invention, with respect to the lower transverse weld seam 11a, the turning point W1 of the first curved tear-open zone A1 is located higher than the turning point W2 of the second tear-open zone A2. Preferably, the apices of the curves 14b and 14c of the first peel weld seam 14 are also located higher than the respective apices of the curves 15b and 15c of the second peel weld seam 15. Due to the represented configuration of the peel weld seams 14, 15, when the bag 10 is rolled from top to bottom, in particular from top right to bottom left, the first peel weld seam 14 initially opens in the region of the curved tear-open zone A1. The first peel weld seam then opens downwards up to the lower transverse weld seam 11a. The first peel weld seam 14 can also tear open further upwards. At least if the first chamber 16c is not supposed to be opened, the first peel weld seam 14 does not need to tear open beyond the third curve 14e. The decisive factor is that the first chamber 16a, adjoining the lower transverse weld seam 11a, is now connected to the second chamber 16b. As the bag 10 is rolled up further, the second peel weld seam 15 then opens in the region of the second tear-open zone A2. Starting from the tear-open zone A2, the second peel weld seam 15 opens at least downwards up to the lower transverse weld seam 11a such that the third chamber 16c is then also connected to the remaining bag volume. Fig. 1a is a detailed view of the tear-open zones A1 and A2. The first curve 14b / 15b and the second curve 14c / 15c each have an inner radius r i and an outer radius r a. The first curve 14b / 15b has an inner radius of 2 to 4 mm and an outer radius of 8 to 12 mm. The second curve 14c / 15c has an inner radius of 10 to 16 mm and an outer radius of 15 to 20 mm. As represented with reference to Fig. 2, the bag 10 is packaged in a secondary package, preferably equipped with an oxygen barrier. The secondary package is here in the form of a tear-open bag 30 made of two films welded to one another. A longitudinal weld seam of the tear-open bag 30 has a notch 31 on the edge to make it easier to tear open the tear-open bag 30. Fig. 3 shows an alternative exemplary embodiment of a bag 10 filled with a medical fluid. In contrast to the example represented in Fig. 1, the present bag 10 is higher, i.e. the distances between the ports 20a - 20c and the peel weld seams 14, 15 correspond to the exemplary embodiment according to Fig. 1. The ratio of height h to width w in this exemplary embodiment is 1.05 - 1.2. Preferably, the bag 10 has a width w of w = 310 - 350 mm and / or a length or height h of h = 345 - 390 mm. The bag represented in Fig. 3 is filled with a total of 1300 - 1700 ml, preferably 1400 - 1600 ml, of fluid. The first chamber 16a is preferably filled with a glucose solution. The second chamber 16b is preferably filled with an amino acid-containing solution. The third chamber 16c is preferably filled with a fat emulsion. The first chamber 16a is preferably filled with 840 - 920 ml. The second chamber 16b is preferably filled with 450 - 525 ml. The third chamber 16c is preferably filled with 140 - 190 ml. The second chamber 16b and / or the third chamber 16c preferably have a height of 210 - 230 mm (measured between the lower transverse weld seam 11a and the section 14e). The first chamber 16a above the third chamber 16c preferably has a height of 110 - 140 mm (measured between the section 14f and the straight region of the upper transverse weld seam 11b). The first chamber 16a has a width of preferably 50 - 70 mm in the lower straight section 14a. The second chamber 16b has a width of preferably 145 -165 mm in the lower straight section 14a / 15a. The third chamber 16c has a width of preferably 80 - 100 mm in the lower straight section 15a. The first chamber 16a has a width of preferably 50 - 70 mm in the lower straight section 14a (measured between the section 14a and the right longitudinal weld seam 12a). The second chamber 16b has a width of preferably 145 - 165 mm in the lower straight section 14a / 15a (measured between the section 14a and the section 15a). The third chamber 16c has a width of preferably 80 - 100 mm in the lower straight section 15a (measured between the section 15a and the left longitudinal weld seam 12b). With reference to Fig. 3, the determination of the tear-open force of the peel weld seams 14, 15 will also be explained. First, using the peel weld seam 14 as an example, a 30 mm wide cutout 40 of the two films is cut out along a straight section of the peel weld seam 14. On one side of the strip-shaped cutout 40, the films are pulled apart parallel to the peel weld seam 14 and the maximum force for separating the film strips is measured by means of a force measuring device. This maximum force corresponds to the tear-open force. Fig. 4 is a flow diagram of an exemplary embodiment of the method 100 according to the invention for producing a medical bag 10. A first and a second film are provided (step 101). The films are preferably in the form of multi-layer polyolefin films. The films are then welded to form the bag 10 by means of a contact welding method, wherein at least one withdrawal port 20a is welded in a lower transverse weld seam 11a (step 102). The bag is then divided into the three chambers 16a - 16c by welding a first peel weld seam 14 and a second peel weld seam 15 (step 103). The peel weld seams 14, 15 are therefore made after welding the longitudinal and transverse weld seams 11a, 11b, 12a, 12b. The course of the peel weld seams 14, 15 corresponds to the representation in Fig. 1 or Fig. 3. The bag is then packaged in a tear-open bag 30, preferably welded in (step 104), and autoclaved 105 together with the tear-open bag 30. The invention makes it possible to provide a medical bag which is in particular suitable for paediatric applications. List of reference numbers 10 Bag 11a  Lower transverse weld seam 11b  Upper transverse weld seam 12a First longitudinal weld seam 12b Second longitudinal weld seam 13 Hanger 14    First peel weld seam 14a   Lower straight region or section 14b First curve 14c Second curve 14d Upper straight region or section 14e Third curve 14f   Horizontal straight section 15   Second peel weld seam 15a Lower straight region or section 15b First curve 15c Second curve 15d Upper straight section 16a First chamber 16b Second chamber 16c Third chamber 20a Port / withdrawal port 20b Port / Injection port 20c Port / Blind port 21 Lower part 22 Weld-in section 23 Upper part 24 Break-off cap 30 Tear-open bag 31 Notch 40 Cutout 100 Method for producing a medical bag 101 Providing a first and a second film 102 Welding the first and second films to form the bag (10), wherein at least one withdrawal port (20a) is welded in a lower transverse weld seam (11a) 103 Dividing the bag (10) into three chambers (16a-16c) by welding a first peel 5 weld seam (14) and a second peel weld seam (15) 104 Welding the bag (10) in a tear-open bag (30) 105 Autoclaving the bag (10) arranged in the tear-open bag (30)

Claims

1. A bag (10) which is filled with a medical fluid and which is formed from two films which are welded to one another with a lower transverse weld seam (11a) and an upper transverse weld seam (11b) and with a first longitudinal weld seam (12a) and a second longitudinal weld seam (12b),wherein at least one withdrawal port (20a) is arranged in the lower transverse weld seam (11a),wherein the bag (19) is divided by a first peel weld seam (14) and a second peel weld seam (15) into at least one first chamber (16a), one second chamber (16b) and one third chamber (16c),wherein the first peel weld seam (14) comprises a first curved tear-open zone (A1) and the second peel weld seam (15) comprises a second curved tearopen zone (A2),wherein the first peel weld seam (14), starting from the lower transverse weld seam (11a), has a lower straight section (14a) which merges via the first curved tear-open zone (A1) into an upper straight section (14d), wherein the upper straight section (14d) runs via a third curve (14e) to the second longitudinal weld seam (12b) via a straight region (14f),wherein the second peel weld seam (15), starting from the lower transverse weld seam (11a), has a first lower straight section (15a) which merges via the second curved tear-open zone (A2) into an upper straight section (15d), which ends in the straight region (14f) of the first peel weld seam (14), andwherein the first curved tear-open zone (A1) of the first peel weld seam (14), starting from the lower transverse weld seam (11a), is arranged higher than the second curved tear-open zone (A2) of the second peel weld seam (15).

2. The bag filled with a medical fluid according to the preceding claim, characterised in that a turning point (W1) of the first tear-open zone (A1) of the first peel weld seam (14), starting from the lower transverse weld seam (11a), is located higher than a turning point (W2) of the second tear-open zone (A2) of the second peel weld seam (15).

3. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the first curved tear-open zone (A1) and / or thesecond curved tear-open zone (A2) is / are formed from a first curve (14b, 15b) and a second opposite curve (14c, 15c), wherein the first curve (14b, 15b) merges into the second opposite curve.

4. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the first curve (14b, 15b) and the second curve (14c, 15c) are substantially in the form of 90° curves.

5. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the first curve (14b, 15b) has a smaller inner radius and / or a smaller outer radius than the second curve (14c, 15c).

6. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the upper straight section (14d) of the first peel weld seam (14) extends via the third curve (14e) to the second longitudinal weld seam (12b) via a straight region (14f) running substantially parallel to the lower transverse weld seam (11a).

7. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the upper straight section (15d) of the second peel weld seam (15) ends in the horizontal straight region (14f) of the first peel weld seam.

8. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the first chamber (16a) extends from the lower transverse weld seam (11a) up to the upper transverse weld seam (11b) and via the second chamber (16b) and the third chamber (16c).

9. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the second chamber (16b) and the third chamber (16c) extend over 1 / 3 to 2 / 3 of the height of the first chamber (16a).

10. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that in the lower transverse weld seam (11a) are arranged two, in particular three, ports (20a-20c), each of which is connected toone of the three chambers (16a-16c).

11. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the bag (10) is arranged sterile in a secondary package, in particular in a tear-open bag (30).

12. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the bag (10) is filled with 500 to 2000 ml of medical fluid, in particular with 800 to 1200 ml or with 1300 to 1700 ml of medical fluid.

13. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the bag (10) is designed in such manner that when the bag (10) is rolled up from top to bottom, in particular from top right to bottom left, the first peel weld seam (14) begins to tear open in the region of the first tearopen zone (A1).

14. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the bag (10) is designed in such manner that when the bag (10) is rolled up from top to bottom, in particular from top right to bottom left, the first peel weld seam (14) tears open at least up to the lower transverse weld seam (11a), wherein after that the second peel weld seam (15) begins to tear open at the second tear-open zone (A2).

15. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in thatthe first chamber (16a), in particular the chamber filled with a glucose component, contains 0.4 to 0.7 times, in particular 0.5 to 0.7 times, the volume of the medical fluid, and / orin that the second chamber (16b), in particular the chamber filled with an amino acid component, contains 0.2 to 0.4 times, in particular 0.35 to 0.4 times, the volume of the medical fluid, and / orin that the third chamber (16c), in particular the chamber filled with a fat component, contains 0.05 to 0.15 times, in particular 0.08 to 0.14 times, the volume of the medical fluid.

16. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the first and / or the second peel weld seam (14, 15) is or are designed in such manner that the films of a 30 mm wide straight strip separate from one another with a force of between 15 and 50 N, preferably between 20 and 30 N.

17. The bag (10) filled with a medical fluid according to one of the preceding claims, characterised in that the bag (10) is designed for applications in paediatrics.

18. A method for producing a bag (10) filled with a medical fluid, comprising the steps:- Providing a first and a second film;- Welding the first and second films to form the bag (10), wherein at least one withdrawal port (20a) is welded in a lower transverse weld seam (11a),- Dividing the bag (19) into three chambers (16a-16c) by welding a first peel weld seam (14) with a first curved tear-open zone (A1) and a second peel weld seam (15) with a second curved tear-open zone (A2),wherein the first peel weld seam (14), starting from the lower transverse weld seam (11a), has a lower straight section (14a) which merges via the first curved tear-open zone (A1) into an upper straight section (14d), wherein the upper straight section (14d) runs via a third curve (14e) to the second longitudinal weld seam (12b) via a straight region (14f),wherein the second peel weld seam (15), starting from the lower transverse weld seam (11a), has a first lower straight section (15a) which merges via the second curved tear-open zone (A2) into an upper straight section (15d), which ends in the straight region (14f) of the first peel weld seam (14), andwherein the first curved tear-open zone (A1) of the first peel weld seam (14), with respect to the lower transverse weld seam (11a), is arranged higher than the second tear-open zone (A2) of the second peel weld seam (15).

19. The method according to the preceding claim, characterised in that the first peel weld seam (14) and / or the second peel weld seam (15) is / are welded after welding the lower transverse weld seam (11a) and welding at least one second longitudinal weld seam (12b) and / or in that the chambers (16a-16c) of the bag(10) are filled with a medical fluid via respectively one port (20a-20c) after welding the transverse weld seam (11a) and the peel weld seams (14, 15).

20. The method according to one of the preceding claims, characterised in that5 at least the lower transverse weld seam (11a) and the peel weld seams (14, 15) are welded by means of a contact welding method and / or in that the bag (10) is packaged in a secondary package, in particular a tear-open bag (30), and is sterilised in the secondary package.

Images