EP4251229A1 - Device and method for verifying the correct setup of a blood treatment apparatus - Google Patents

Abstract

The present invention relates to a method for automatically verifying correct setup of a blood treatment apparatus, in particular a gravimetric cycler for peritoneal dialysis having only one set of scales and a hose system, the hose system comprising at least three line portions for connection to at least one drainage bag, at least one solution bag and a patient, wherein, by means of the set of scales, a change in the weight of the solution bag and/or of the drainage bag is detected during the filling process of the hose system and is compared to an expected value. The invention also relates to a corresponding blood treatment apparatus.

Description

Device and a method for checking the correct structure of a blood treatment device

The present invention relates to a device and a method for checking the correct construction of a blood treatment device and a corresponding blood treatment device.

In the context of peritoneal dialysis, in particular automated peritoneal dialysis, a blood treatment is usually carried out overnight at the patient's home.

With this method, the blood treatment device or the cycler takes over the temperature control of the bag, the emptying and filling of the abdomen as well as the therapy control.

The patient assembles the cycler before going to bed (for example by connecting the hose system of the cycler with the solution bags and the drainage bag) and connects to the cycler once using a connecting hose. The automated therapy is carried out overnight. Therapy regimen, number and duration of cycles, dialysate turnover and glucose concentration on are individually tailored to the patient. In certain cases, the patient may be given a final fill that may differ in dialysate concentration from the previous fills. This final filling is usually administered to the patient from a separate pouch called a "last bag" which is allowed to remain in the abdomen until the next voiding phase, preferably midday exchange or the next night.

However, the treatment can also be ended with a final filling with the same concentration of dialysis solution from the solution bags, which also remains in the patient until the next emptying phase. Furthermore, it can be provided that the treatment can be completed without a final enema.

Since the blood treatment takes place at the patient's home, the blood treatment device must be set up by the patient himself without the help of medically trained personnel.

It has been shown in practice that errors in the construction of the blood treatment device (e.g. incorrectly connected hose lines, hose lines not correctly connected to the valves, closed clamps and other shut-off elements on the hose lines, kinked or crushed hose lines, incorrectly opened break-off cones of the solution bags, etc .) occur relatively frequently and jeopardize the success of the treatment.

For example, before starting the actual treatment, the tube system of the blood treatment device must be filled with liquid in order to remove air from the system. This filling process before the actual start of the treatment is also known as priming. Priming usually takes place in two steps: First, the hose system between the solution bag(s) and the drainage bag(s) is filled. The line section leading to the patient is then filled.

If the priming has not been carried out correctly, the subsequent blood treatment cannot be carried out correctly, for example because the necessary volumes cannot flow or there is still air in the system. In this case, the blood treatment usually has to be stopped prematurely for reasons of patient safety.

The object of the present invention is to mitigate or even completely eliminate the disadvantages of the prior art. In particular, the object of the present invention is to improve patient safety during peritoneal dialysis.

This object is solved by the subject matter of the independent claims. Advantageous developments of the invention are the subject matter of the dependent claims.

A first aspect of the present invention relates to a method for automatically checking the correct structure of a blood treatment device, preferably a gravimetric cycler for peritoneal dialysis, with at least one weighing system and a hose system, the hose system having at least three line sections for connection to at least one drainage bag, at least one solution bag and a patient line, wherein a change in weight of the solution bag and/or the drainage bag during a filling process of the tube system is detected by means of the weighing system and is compared with an expected value.

A wide variety of weight measurement methods, such as scales, load cells, strain gauges, piezo elements, can be used as the weighing system. The weighing system preferably has only one scale or load cell. The simple For the sake of safety, the weighing system will be referred to as scales in the further course of the decision, without this implying a restrictive effect. For example, a combined weight of the bag or bags with fresh dialysis fluid and the bag or bags for used dialysis fluid (drain bag) can be detected by means of just one scale or load cell.

The patient is preferably not connected to the blood treatment device during the priming and thus during the execution of a method according to the invention.

According to the invention, it is thus verified whether an expected change in the weight of the solution bag and/or the drainage bag occurs during a filling process of the tube system.

For example, during a normal filling process, a certain amount (e.g. 50 ml) of liquid flows from the solution bag into the tubing system. In this case, it is expected that the weight of the solution bag, from which the liquid flows into the tubing system, and the drainage bag, as recorded by the scales, will decrease by 50 g accordingly.

If the actually measured weight of the solution bag and the drainage bag corresponds to this expected value (e.g. initial weight minus 50g), it can be assumed that the tubing system of the blood treatment device is correctly connected to the solution bag, so that the valves open and close properly, no lines are pinched or kinked, the solution bag is fluidically released (breaking of a breaking cone) etc.

However, if the blood treatment device is not set up correctly or connected to the tubing system, so that, for example, the valves do not open and close properly, a line is pinched or kinked, or the solution bag is not fluidically released (unbroken rupture cone), the attempted filling process either cannot no liquid flow (because e.g. the solution bag is still closed) or only flow partially (e.g. up to a pinched line section). For example, only a change in weight of the solution bag of minus 20 g instead of minus 50 g is recorded. In this case, the expected value of the weight change is not reached and it can be concluded that the blood treatment device is incorrectly set up.

The expected value can serve as a minimum value, e.g. of a weight change, for the blood treatment device to be set up correctly. For example, it can be concluded that the structure is correct if the recorded change in weight reaches at least the value to be expected based on the design of the blood treatment device and its hose system, e.g. 50 g.

The filling process of the hose system preferably takes place automatically. Likewise, the structure of the blood treatment device is preferably checked automatically during the filling process. Due to the automatic execution, the movements to be carried out by the patient are reduced and sources of error are avoided. A combined weight and/or a combined weight change of the solution bag and the drainage bag is preferably determined by means of the scales.

For example, the solution bag(s) (including a last bag if used) and the drainage bag(s) can be placed on the same scale or metrologically connected to it.

This configuration offers the advantage that it can be detected whether the hose system is correctly inserted into the drainage valve or connected to it. For example, if the tubing system is incorrectly inserted into the drainage valve so that the drainage valve cannot stop the flow, liquid will flow from the solution bag into the drainage bag during the filling process and will not remain in the tubing system. This means that the air in the tubing system is not displaced and the system cannot be successfully filled with solution. . Since the weight of the solution bag and the drainage bag is recorded using a common scale, the change in weight is minimal and is around 0 g. In this case, the change in weight does not reach the expected value or a tolerance range surrounding it, so that a faulty structure of the blood treatment device can be inferred.

In this case, a user can be instructed, for example via a corresponding output, to check the drainage valve and then to start a new filling process.

Preferably, within the scope of the present invention, the start of a blood treatment is released only after the detection of a correctly executed filling process of a correctly constructed blood treatment device.

For example, in the event of an incorrect filling process and/or incorrect assembly of the blood treatment device, the start of a blood treatment is blocked and preferably an output is made to a user, e.g. if the comparison shows that the change in weight of the solution bag and/or the drainage bag deviates from the expected value or a tolerance range , especially if the change in weight does not reach the expected value.

If a faulty filling process and/or a faulty structure of the blood treatment device is detected, an output in the form of instructions is preferably sent to a user, prompting them to systematically check the structure of the blood treatment device and, for example, to check the rupture cone of the at least one solution bag and / or to check clamps or shut-off elements arranged on the hose system and / or to check whether the line sections of the hose system are correctly connected, in particular whether they are correctly connected to the associated valves or inserted into them. According to the invention, the user is thus preferably automatically guided through a problem-solving routine. The output can include an acoustic signal and/or an optical signal, for example a blood treatment device according to the invention can be designed to announce various instructions to the user or to display them on a display device, such as a display.

According to the invention, it can be provided that the user has to confirm the execution of an instruction before a further instruction is given. For example, the user may be required to confirm that they have checked the solution bag rupture cone as instructed before further action is given to the user to check the hose clamps. The confirmation can be made either acoustically or by ticking off an instruction on a display or by actuating another input unit.

If the comparison shows no deviation in the change in weight of the solution bag and/or the drainage bag from the expected value or if this is within a tolerance range, the start of a blood treatment is preferably released.

As an alternative or in addition, it can be provided that a start of a blood treatment is released when the recorded change in weight exceeds the expected value and preferably remains within a specific tolerance range. In this embodiment, the expected value serves as a minimum value, at which it is assumed that the hose system is sufficiently filled with the corresponding change in weight. This also ensures that the patient line is not overfilled and there is no risk of contamination from solution escaping or adhering to the distal end of the patient line. When determining the expected value of the change in weight during a filling process, the design of the blood treatment device and the hose system used preferably takes into account the weight, number and spatial arrangement of the solution bags relative to one another and/or to the blood treatment device.

For example, a specific valve opening duration, for example of the valve or the solution bag(s), can be set for a filling process in a specific blood treatment device.

Depending on the type of solution bags used (e.g. capacity, weight, etc.) and their arrangement (e.g. storage of the bags one above the other or next to each other, storage of the bags in the vertical direction above the blood treatment device or not), a variable amount of liquid flows during the specific valve opening duration. The change in weight to be expected during the specific valve opening duration therefore also depends on the type of solution bag used and their arrangement in relation to one another and/or in relation to the blood treatment device.

Alternatively or additionally, when determining the expected value of the weight change during a filling process, the number and/or the filling volume of previous incomplete filling processes can be taken into account, with the expected value preferably decreasing with an increasing number of previous incomplete filling processes.

The expected value preferably decreases in such a way that the calculated expected value of the difference between an expected value for a correct filling process of a correctly constructed blood treatment device (e.g. 50 g) and the cumulative weight change due to previous faulty filling processes (e.g. 13 g in filling process 1 and 17 g in filling process 2, i.e. cumulatively 30g). For filling process 3, which follows filling process 2, the expected value of the weight change is only 20g (50g -30g), since 30g of liquid has already been fed into the hose system in the previous filling processes and therefore only a further 20g are required until the hose system is sufficiently filled . Alternatively, after a first filling process, the further filling processes can be carried out with the same, reduced filling quantities.

Another aspect of the present invention relates to a blood treatment device, in particular a gravimetric cycler for peritoneal dialysis, with only one scale and one hose system, the blood treatment device being designed to automatically detect and detect a correct structure of the blood treatment device, preferably within the scope of a method according to the invention wherein the hose system comprises at least three line sections for connection to at least one drainage bag, at least one solution bag and a patient line, wherein the blood treatment device also has a detection unit which is designed to use the scales to record a change in weight of the solution bag and/or the drainage bag during a filling process of the hose system to detect, and has an evaluation unit, which is designed to compare the detected change in weight with an expected value.

A blood treatment device according to the invention preferably also has a control unit which is designed to automatically carry out the filling process of the tube system and/or to automatically carry out a method according to the invention.

Furthermore, it has proven to be advantageous in practice if the detection unit is designed to determine a combined weight and/or a combined weight change of the solution bag and the drainage bag using the scales. The control unit can be designed if the comparison shows a deviation in the change in weight of the solution bag and/or the drainage bag from the expected value or a tolerance range surrounding the expected value, in particular if the change in weight does not reach the expected value or tolerance value (insufficient filling process), a start of a Block blood treatment and issue to a user.

The output to the user can be optical or acoustic and guide the user through a sequence of action steps in which the user checks the structure of the blood treatment device and corrects it if necessary.

For example, the output can prompt the user to check the rupture cone of the at least one solution bag and/or to check clamps or shut-off elements arranged on the hose system and/or to check whether the line sections of the hose system are correctly connected, in particular whether they are correctly connected to the associated valves have been connected. In this way, a source of error in the system structure can be localized and eliminated.

Furthermore, the control unit can be designed to enable the start of a blood treatment if the comparison shows no deviation in the weight change of the solution bag and/or the drainage bag from the expected value or if the weight change is within a tolerance range above or below the expected value. In other words, the treatment is only released when a properly performed filling process has been detected.

The treatment can also be unlocked when the weight change meets or exceeds the expected value. The expected value thus serves as a minimum value and reflects the minimum volume that is required to fill the hose system. The control unit is preferably designed to take into account the weight, the volume, the number and/or the spatial arrangement of the solution bags in relation to one another and/or to the blood treatment device when determining the expected value of the weight change during a filling process.

It has also proven to be advantageous in practice if the control unit is designed to take into account the number and/or the filling volume of previous incomplete filling processes when determining the expected value of the weight change during a filling process, with the expected value preferably increasing with an Number of previously incompletely executed filling processes decreases. In this way, the volume in the tube system due to previously incompletely executed filling processes is taken into account by the expected value of the current filling process.

The invention also includes the fact that the method and/or the blood treatment device is designed in such a way that a faulty set-up of the therapy system is not detected or not only detected (e.g. hose system not correctly inserted, cone of bags not broken), but also the type of hose system is recognized, e.g. B. A tubing system specifically designed for pediatric patients or other patient groups.

In this embodiment of the invention, it is provided that a specific treatment mode is set on the blood treatment device (e.g. under device settings or patient limit values), which is associated with a respective, specific tube system.

It is conceivable, for example, to choose a pediatric therapy mode that requires a special tube system for pediatric patients, or to choose a “default”, ie standard therapy mode, which is set for all other patients. This embodiment is based on the concept that different Tubing systems have different configurations/dimensions and therefore different filling volumes.

Depending on the selected therapy mode (e.g. pediatric or standard), the device expects a corresponding minimum required priming volume to confirm a correctly set up system or correctly selected circuit and would also use a different priming method to use a higher volume.

For example, if a standard tubing set is used instead of a pediatric tubing set, the expected priming volume for pediatric mode cannot be achieved because the standard set can only accommodate the maximum volume (eg, 50 mL). Circuits cannot be "overfilled" (filled with more fluid than the maximum possible fill volume) because the hydrophobic membrane of the patient interface does not allow fluid to exit the circuit. The use of an incorrect hose system, i.e. one that does not belong to the selected therapy mode, can lead to undesirable events (e.g. reduced therapy effectiveness due to a high recirculation volume in relation to the total treatment volume).

As an example is mentioned:

Standard tubing system / therapy mode: threshold for priming OK: 40g, max. priming volume: 50ml

Pediatric hose system / therapy mode: threshold for priming OK: 60g, max. priming volume: 70ml

For example, the device is set to pediatric therapy mode and a standard tubing set is accidentally inserted during priming: the device primes the tubing system according to the priming procedure for "pediatric mode" (e.g., prolonged valve opening) and expects a minimal sex weight change of 60 g. Due to the different priming procedure, the tube system is completely filled with liquid, resulting in an effective weight change of 50 g during priming. The device would reject the setup because the required minimum change in weight of the solution bag of 60 g was not achieved.

In the given example, to differentiate between the standard and pediatric tubing sets, the threshold for the pediatric tubing set (60 g) must be greater than the maximum possible priming volume for the standard set (50 g).

The aforementioned embodiment of the invention thus relates to the detection of a faulty tube system based on the knowledge that the filling, i.e. priming volume, does not correspond to the expected filling volume. This recognition presupposes that the different tube systems have different maximum filling volumes.

Further advantages, features and effects of the present invention result from the following detailed description of preferred embodiments of the invention with reference to the figures, in which the same reference symbols denote the same or similar components or steps. This shows:

1 shows the structure of a blood treatment device according to the invention;

2 shows an overview of a method according to the invention;

3 shows an overview of a further method according to the invention;

4 shows the relationship between the type of solution bag used and the valve opening times required for a filling process;

5 shows a table with characteristic values of a method according to the invention.

As shown in FIG. 1, a gravimetric peritoneal dialysis device has a tube system 1 which contains two solution bags 2 with fresh dialysis fluid. ability, a last bag (“last bag”) 3, a drainage bag 4 and a patient access 5 fluidly connects to one another.

The solution bags 2 are each equipped with a breaking cone 7 . The Last Bag 3 is equipped with a crushing cone 9. The crushing cones 7 and 9 are each fluidically connected downstream of a clamp 8 . The drainage bag 4 can be equipped with a rupture cone 10 with a valve 11 upstream of it.

A valve 12 or 13, in particular a valve of a peritoneal dialysis machine, is arranged in the line from the last bag 3 and in the line from the solution bags 2. A Y-shaped connection piece 14 is arranged between the solution bags 2 and the last bag 3 and the patient connection 5 . A connection point 15 is provided between the solution bags 2 and the last bag 3 and the Y-shaped connecting piece 14, which can also be equipped with a breaking cone so that the emptied solution bag set can be separated from the drainage set and used as a drainage bag in a subsequent treatment. A clamp 16 is arranged between the connecting piece 14 and the patient access 5 . However, this clamp 16 is not absolutely necessary for the execution of a method according to the invention and can be omitted.

Fig. 2 shows the valve opening times and the corresponding measured changes in the combined weight of the solution bags and the drainage bag. The Y-axis shows the measured weight, the X-axis shows the time. This illustration assumes that the rupture cones of all bags are correctly opened and that the entire system is set up correctly.

The priming process begins at time 0, when a user confirms the start of priming. The system then waits a short time (eg 8s) until time 1 to give the system time to stabilize. Once the recorded weight is stable, the weight at time 1 is saved as the baseline weight. If the therapy prescription provides for a last filling from the Last Bag, then the valve 12 of the Last Bag line and the drainage valve 11 are opened. This phase, in which the line of the Last Bag is filled, is identified in FIG. 2 as phase a). The recorded weight decreases in a stepped (linear) manner due to the liquid flowing into the Last Bag line and reaches a plateau at the end of phase a) when no more liquid is flowing because the Last Bag line is full.

After completion of phase a), the valve 12 of the Last Bag line is closed and the valve 13 of the solution bag line is opened. This will prime the solution bag line and drain bag line. This phase is denoted as phase b) in FIG. The recorded weight decreases linearly in phase b), since liquid flows from the solution bags 2 into the lines. At the end of phase b) the weight reaches a plateau because no more liquid flows because the valves are closed. In this case, the valve 11 is closed immediately or at the same time as the valve 12 in order to prevent the drainage line from running empty.

The patient line is then filled after a short stabilization time or valve switching time in step c). For this purpose, the drainage valve 11 is closed and the valve 13 of the solution bag line, which was closed during the stabilization or switching time, is opened. The recorded weight decreases linearly in phase c), since further liquid flows from the solution bags 2 into the patient line.

The opening duration of the valve 13 of the solution bag line in phase c) depends on the number, type, weight and arrangement of the solution bags used. Depending on the solution bags used, the flow rate through the solution bag line varies, so that different valve opening times are required to reach a defined volume in the line. By adjusting the valve opening duration, overfilling of the patient line and/or possible contamination can be prevented. Another beneficial The effect of an exact filling process is that when filling the tubing system, only as much dialysis solution is used as is necessary to flush the entire tubing system and the remaining solution is therefore available for efficient treatment.

After the end of phase c), a further stabilization time is awaited. Once the recorded weight has stabilized, it is saved as the end weight. The recorded change in weight during the filling process can be determined from the difference between the initial weight and the final weight.

If this change in weight reaches or exceeds an expected value, it can be concluded that the filling process was carried out successfully, since a sufficient quantity of liquid has flowed into the hose system and also remains there. This state can only be achieved if the complete system has been correctly set up. In this case, the execution of a blood treatment can be unlocked.

If the change in weight does not reach the expected value, a corresponding output is sent to the user with the request to check the structure of the blood treatment device and then, if necessary, to repeat the filling process. The expected value is set lower for the repeated filling processes than for the previous filling processes in order to take account of a partially filled hose system.

If the blood treatment device is set up correctly, the change in weight to be expected is preferably between approximately 45 g and approximately 55 g.

If the tubing system is not inserted or is incorrectly inserted into valve 12 and/or valve 13, liquid will already flow out of bags 3 and 2 into the tubing system before the actual filling process. No further liquid flows during the filling process and the change in weight is approx. 0g. According to one embodiment, the blood treatment device has a patient hose clamp 16 and the user has the option of readjusting the filling process manually. For this purpose, a control panel can be provided on the blood treatment device, via which the patient can refill the hose system in incremental amounts. However, the possibility of adjusting the filling process manually, preferably via the control panel, is independent of the presence of the patient hose clamp 16. In a special embodiment, the patient clamp can be omitted. If the tubing system is incorrectly inserted into valve 11, liquid will flow unhindered from bags 3 and 2 via the tubing system to drainage bag 4. Since the scale records a combined weight of bags 2, 3 and 4, the recorded weight change in this is also case approx. 0g.

In this case, the user can be instructed to check whether the hose system has been inserted incorrectly into the valve 11, to correct this accordingly and then to start another filling process. In this way, it can be determined why the missing weight change was detected.

Even if the bursting cones of the bags 2 and 3 or the clamps 8 are not opened, no weight change can be detected. In this case, the user can be instructed to check whether the crushing cones and clamps are open, correct this if necessary and then start another filling process.

When detecting an incorrect structure of the blood treatment device, the user is thus offered solutions, for example by checking the breaking cones and clamps and/or by checking whether the hoses are correctly inserted into the valves. In order to further increase patient safety, as shown in FIG. 3, an additional step can be added at the end of the method shown in FIG. A combination of a drainage line that is not plugged into the drainage valve and closed clamps on the drainage line cannot be detected as a faulty structure of the blood treatment device using the method shown in Fig. 2, since the liquid remains in the tubing system due to the closed clamps (although the valve 11 drainage line cannot shut off) and thus a correct change in weight is recorded.

In order to detect this error condition, as shown in FIG. 3 , after the completion of the second stabilization time, the drainage valve 11 is opened, whereby the detected weight increases linearly as liquid flows into the drainage bag 4 . In the case of a closed clamp on the drainage line, the weight would not increase because no liquid can flow.

The hose system or the patient line is then refilled by opening the valves 12 and/or 13, preferably valve 13, of the solution bag line(s) and the clamps 8. As a result, the recorded weight decreases linearly, since liquid flows out of the solution bags 2 and/or out of the solution bag 3 into the tube system.

The valve opening duration of the valves in phases a) and b) is preferably set depending on the type, number, weight and spatial arrangement of the solution bags used. The valve opening duration in phase a) can be e.g. 1000ms, in phase b) it can be 2000ms.

In FIG. 4, for example, the weight of an inserted solution bag in kg is plotted on the X-axis. The Y-axis indicates the required valve opening duration in ms. The filling speed of the tube system and in particular of the patient line depends on the total volume of the solution bags used and the number of bags.

For example, if several bags are stored one on top of the other, the pressure in the bags increases and a shorter valve opening time is required in order to feed a defined volume from the bags into the tube system. In Fig. 4, for example, the bottom line shows the case of two bags superimposed.

If only one bag is used, the rate of filling increases as the volume of the bag increases. In other words, the required valve open time decreases as the volume of the bag increases. For example, in Figure 5, the top line shows the case of a single bag inserted.

The type, number, weight and spatial arrangement of the solution bags used are also taken into account when determining an expected value of the change in weight during a filling process. This is shown in FIG. 6, in which the “weight delta” column shows the respective expected weight change for different bag configurations.

As shown in the first column of the table from Fig. 5, with an arrangement of 2 bags (see column "Bag configuration"), with a recorded initial weight of 2300 g ("Tray weight"), a valve opening duration of 4000 msec ("Calc .Time patient”) can be considered sufficient to fill the hose system, in particular to fill the patient line. The expected change in weight for a correct filling process of such a blood treatment device is 45 g (see "weight delta").

If two bags are used (second row in column 1 "Bag configuration"), each weighing 2150g and stored on top of each other, for example, is only an opening duration of 3900ms is required and the expected weight change is 46 g.

If a load bag is also used (third row in column 1 "Bag configuration"), the total weight of the bags is 4400g and an opening time of 3900ms is required and the expected weight change is 53g.

Since the recorded weight change can deviate slightly from the expected value even with a correctly constructed blood treatment device, a correctly constructed blood treatment device and a correctly executed filling process can be inferred if the recorded weight change falls within a tolerance range.

In the table in Fig. 5, the "Filling level" column indicates the distance between the patient connector and the fill level of the solution in the tubing. A low value indicates a high filling level of the solution in the hose, while a higher value reflects a low filling level. A distance of between 15 cm and 20 cm is preferred as a tolerance to avoid wetting the hydrophobic membrane.

Claims

Claims Method for automatically checking the correct structure of a blood treatment device, in particular a gravimetric cycler for peritoneal dialysis, with only one scale and one tube system, the tube system comprising at least three line sections for connection to at least one drainage bag, at least one solution bag and a patient line, wherein by means of the A change in the weight of the solution bag and/or the drainage bag during a filling process of the tube system is recorded and compared with an expected value. Method according to claim 1, characterized in that the filling process of the hose system takes place automatically. Method according to Claim 1 or 2, characterized in that a combined weight and/or a combined change in weight of the solution bag and the drainage bag is determined by means of the scales. Method according to one of the preceding claims, characterized in that if the comparison shows a deviation in the weight change of the solution bag and / or the drainage bag from the expected value or a tolerance range, in particular if the weight change does not reach the expected value, a start of a blood treatment is blocked and an output is made to a user. Method according to Claim 4, characterized in that the output prompts the user to check the rupture cone of the at least one solution bag and/or to check clamps or shut-off elements arranged on the hose system and/or to check whether the line sections of the hose system are correctly connected , especially whether they are correctly connected to the associated valves. experience according to one of the preceding claims, characterized in that if the comparison shows no deviation in the weight change of the solution bag and/or the drainage bag from the expected value or if this is within a tolerance range, the start of a blood treatment is released. experienced according to one of the preceding claims, characterized in that when determining the expected value of the weight change during a filling process, the weight, the type of hose system, the number and spatial arrangement of the solution bags to each other and / or to the blood treatment device is taken into account. experienced according to one of the preceding claims, characterized in that when determining the expected value of the weight change during a filling process, the number and / or the filling volume previous incompletely executed filling operations is taken into account, the expected value preferably decreasing with an increasing number of previous incompletely executed filling operations. Blood treatment device, in particular a gravimetric cycler for peritoneal dialysis, with only one scale and one tube system, the blood treatment device being designed to automatically detect a correct structure of the blood treatment device, preferably within the scope of a method according to one of Claims 1-8, and the tube system at least three line sections for connection to at least one drainage bag, at least one solution bag and a patient line, the blood treatment device comprising a detection unit which is designed to use the scales to detect a change in weight of the solution bag and/or the drainage bag during a filling process of the tube system , and has an evaluation unit which is designed to compare the recorded change in weight with an expected value. Blood treatment device according to Claim 9, further having a control unit which is designed to automatically carry out the filling process of the tubing system and/or to automatically carry out a method according to one of Claims 1-8. Blood treatment device according to Claim 9, characterized in that the detection unit is designed to use the scales to determine a combined weight and/or a combined weight change of the solution bag and the drainage bag. Blood treatment device according to one of Claims 9 to 11, characterized in that the control unit is designed if the comparison shows a deviation in the change in weight of the solution bag and/or the drainage bag from the expected value or a tolerance range arises, in particular if the weight change does not reach the expected value, to block a start of a blood treatment and to make an output to a user. Blood treatment device according to Claim 12, characterized in that the output prompts the user to check the rupture cone of the at least one solution bag and/or to check clamps or shut-off elements arranged on the hose system and/or to check whether the line sections of the hose system are correctly connected , in particular to check that they have been correctly connected to the associated valves and/or that the correct tubing system has been used. Blood treatment device according to one of Claims 9 to 13, characterized in that the control unit is designed if the comparison shows no deviation in the change in weight of the solution bag and/or the drainage bag from the expected value or if the change in weight is within a tolerance range above or below the expected value to unlock a start of a blood treatment. Blood treatment device according to one of claims 9 to 14, characterized in that the control unit is designed to determine the expected value of the weight change during a filling process, the weight, the number and / or the spatial arrangement of the solution bags to each other and / or the blood treatment device must be taken into account. Blood treatment device according to one of Claims 9 to 15, characterized in that the control unit is designed to take into account the number and/or the filling volume of previous incomplete filling processes when determining the expected value of the weight change during a filling process, with the Expected value decreases with an increasing number of previous incompletely executed filling processes.