Device for a medical treatment device for measuring the flow of fluids in an inserted lumen and an ensemble comprising a corresponding device and a lumen

Description

[0001] The invention relates to a device for a medical treatment device for measuring the flow of liquids in a lumen to be inserted and to an ensemble comprising a corresponding device and a lumen. background

[0002] In medical treatment devices, it is often necessary to measure the flow of a medium. This presents the problem that all elements of a medical treatment device that could come into contact with a patient, especially fluid-carrying lumens, must be sterilizable.

[0003] Various devices for measuring a flow are known from the state of the art.

[0004] This makes it possible to measure flow in a fixed arrangement using ultrasound. However, such arrangements are permanently installed, meaning that in a medical treatment device, for example, the fixed arrangement must be integrated into a fluid circuit. This means that the arrangement must be sterilized before use on a patient. This is time-consuming and also prone to errors. Furthermore, these fixed arrangements often have the disadvantage that they involve a lateral inflow / outflow at a 90° angle to the measuring section. However, such angles frequently lead to strong turbulence, which can impair the measurement.

[0005] To circumvent this problem, solutions have been developed in the past that utilize a clamp-like design to monitor a disposable lumen. One example is US patent application US 2013 / 104667 A1, which describes an ultrasound-based flow rate measurement device that can be subsequently fixed around a lumen. However, this device must be precisely adjusted to the lumen diameter.

[0006] However, due to the principle, a signal is coupled into the lumen or measured perpendicular to the flow (i.e. the flow direction).

[0007] Typical arrangements involve two elements of the measuring arrangement (e.g., ultrasonic transducers) being offset along the lumen, i.e., one element is located upstream of the other. The resulting measuring section is typically only slightly longer, as the offset is usually so small that a maximum angle of 45° is formed between the flow direction and the connecting line between the elements of the measuring arrangement. This lengthens the measuring section to a maximum of approximately 1.4 times the diameter of the lumen compared to a perpendicular length.

[0008] It turns out that such measurements are possible, but due to the measuring arrangement they fundamentally have a low resolution. This is because the time intervals to be determined are significantly shorter than with a measurement in / against the direction of flow. Furthermore, the sensitivity of the measurement is already low because the volume of liquid present in the measuring section at any one time is almost minimal due to the almost vertical arrangement, compared to arrangements with other angles or their measuring sections. It also turns out that the coupling is problematic because, on the one hand, the ultrasound transducers must have good coupling, and on the other hand, the contact pressure of the clamp-like design must not be too high in order to be manageable by a human user in clinical practice and, on the other hand, not to jeopardize the measurement.If such an arrangement is to be practical for different lumen diameters, this is only possible to a very limited extent. Furthermore, with previous designs, handling a disposable lumen involves several steps due to the low resolution in order to ensure the defined contact properties of ultrasound transducers against the disposable lumen before a measurement is possible. Task

[0009] Based on this, it is an object of the invention to provide an improved arrangement that offers high measurement resolution for various lumen diameters while being easy to handle. An alternative or additional object of the invention is to avoid "sharp-edged" or unsteady geometries in the fluid lumen upstream of the measuring section, which are located so close to the measuring section that turbulence occurs in the area of the measuring section. Brief description of the invention

[0010] The object is achieved by a device for a medical treatment device for measuring the flow of liquids in a lumen to be inserted, comprising a receptacle and a first ultrasonic transducer, wherein the receptacle in the device has a first guide side and a second guide side, so that an inserted lumen has an approximately trapezoidal shape in lateral projection, wherein the first ultrasonic transducer is arranged at a first trapezoid corner, and wherein the first ultrasonic transducer is designed during operation to carry out a measurement in or against the direction of flow in the lumen.

[0011] This design provides high measurement resolution for different lumen diameters while being easy to handle.

[0012] In one embodiment of the invention, the device further comprises a second ultrasonic transducer, wherein the second ultrasonic transducer is arranged at a second trapezoid corner, and wherein the second ultrasonic transducer is designed during operation to carry out a measurement in or against the flow direction in the lumen in the opposite direction to the first ultrasonic transducer.

[0013] In a variant of this embodiment, the device is designed so that the second ultrasonic transducer carries out measurements in interaction with the first ultrasonic transducer, so that measurements are carried out in both directions.

[0014] This design offers the advantage that measurements can be taken in both the flow and counterflow directions, thus providing greater measurement accuracy.

[0015] According to one embodiment of the invention, the flow is measured using a transit time method, in which the transit time of an ultrasonic signal from an ultrasonic transducer along the measuring path is measured once in the direction of flow and once against the direction of flow. A reflection at the end of the measuring path back in the exit direction can enable the measuring principle in a configuration with only one ultrasonic transducer, which acts first as a transmitter and then as a receiver. In a configuration with two ultrasonic transducers, both can act alternately as transmitters and receivers.

[0016] According to one embodiment of the invention, the fluid to be measured is blood.

[0017] Special requirements are placed on the measurement of blood properties. This makes the device particularly suitable for blood treatment devices, such as dialysis and apheresis machines, and in the context of extracorporeal blood circulation, such as devices for cardiac and / or pulmonary support or replacement therapy.

[0018] According to one embodiment of the invention, the fluid to be measured is blood, another biological fluid or dialysis substitute or a medical fluid such as a liquid medication or a mixture of the aforementioned fluids.

[0019] Thus, the device can be used in particular for blood treatment devices, e.g. dialysis and apheresis devices, and in the context of extracorporeal blood circuits, e.g. for devices for heart and / or lung support or replacement therapy.

[0020] According to one embodiment of the invention, the fluid to be measured is dialysate or another physiological replacement fluid or a medical fluid such as a liquid medication or a mixture of the aforementioned fluids.

[0021] This means that the device can be used in particular for blood treatment devices such as dialysis machines, dialysis donation systems and apheresis devices.

[0022] In a further embodiment of the invention, the liquid to be measured is liquid food, e.g. for tube feeding.

[0023] In a further embodiment of the invention, the device further comprises a clamp that can selectively interrupt an inserted lumen by clamping it off.

[0024] This makes it possible to provide not only measuring functions but also switching functions, e.g. in the event of a detected error.

[0025] According to a further embodiment of the invention, the trapezoid is isosceles.

[0026] With an isosceles arrangement, the measuring technology can be constructed in a mirror image and thus with similar parts, which reduces development and production costs.

[0027] In yet another embodiment of the invention, the device further comprises an external evaluation device for controlling and evaluating ultrasonic transducers.

[0028] This means that an integrated unit can now be provided using the evaluation device.

[0029] According to yet another embodiment of the invention, the device further comprises at least one further sensor for measuring a further parameter of the liquid.

[0030] By integrating additional sensors, cost-effective assemblies with additional measuring properties can be constructed.

[0031] In a further embodiment of the invention, the device is further configured to detect microbubbles in the liquid located in an inserted lumen, e.g., based on fluctuations in measured flows.

[0032] Microbubbles can be a sign of incipient problems or errors, so detecting microbubbles increases safety. The fact that the arrangement allows for measurement on a larger volume of liquid than in the almost vertical (or at an angle of 45°) measuring arrangements is advantageous. This means that a larger volume can be measured simultaneously for the presence of microbubbles. In a variant of the embodiment, the presence of microbubbles is determined based on fluctuations in the measurement signal from which the flow is determined (e.g., transit time difference of sound signals with and against the flow direction). However, this does not necessarily mean that the presence of microbubbles is determined directly from the measured variable obtained in this way. Instead, an additional variable is used to evaluate the fluctuations in the measurement signal. This additional measured variable can, for example, be amplitude information from the transmitted ultrasound signal.

[0033] In a further embodiment, the device is configured to additionally determine a measured variable which correlates with the density of the liquid to be measured.

[0034] In a further embodiment, the device is configured to additionally determine a measured variable which correlates with the temperature of the liquid to be measured.

[0035] According to yet another embodiment of the invention, the first guide side and the second guide side are displaceable relative to one another.

[0036] This allows the range of lumen diameters to be increased particularly well.

[0037] In yet another embodiment of the invention, the first guide side and the second guide side exert a defined and / or adjustable force on an inserted lumen.

[0038] This allows the ultrasonic transducer to provide measurements with high accuracy within a favorable operating range.

[0039] According to yet another embodiment of the invention, the one receptacle is designed for different diameters of insertable lumens.

[0040] In yet another embodiment of the invention, the first guide side and the second guide side can be moved together in a drawer-like manner relative to a housing.

[0041] This allows for particularly good handling.

[0042] According to a further embodiment of the invention, an ensemble comprising a measuring device according to the invention and a lumen is also provided.

[0043] This design provides high measurement resolution for different lumen diameters while being easy to handle.

[0044] According to one embodiment of the invention, the lumen is a disposable tube.

[0045] In one embodiment of the invention, the lumen is elastic.

[0046] This means that conventional hose systems as well as disposable items can also be combined with the device according to the invention.

[0047] Further advantageous embodiments are the subject of the respective dependent claims, the figures and the description. Brief description of the characters

[0048] The invention is explained in more detail below with reference to a drawing and exemplary embodiments. The drawing is a schematic representation and not to scale. The drawing does not limit the invention in any way.

[0049] They show: Fig. 1 is a schematic representation of embodiments of the invention without an inserted lumen, Fig. 2 is a schematic representation of embodiments of the invention with an inserted lumen, and Figs. 3a and 3b are schematic representations of further aspects of embodiments of the invention. Detailed description of the invention

[0050] The invention will be described in more detail below with reference to the figures. It should be noted that various aspects are described, each of which can be used individually or in combination. This means that any aspect can be used with different embodiments of the invention, unless explicitly presented as a mere alternative.

[0051] Furthermore, for the sake of simplicity, reference will generally be made to only one entity in the following. Unless explicitly stated, the invention may also comprise several of the entities in question. Therefore, the use of the words "a," "an," and "another" is to be understood merely as an indication that at least one entity is used in a simple embodiment.

[0052] Where procedures are described below, the individual steps of a procedure can be arranged and / or combined in any order, unless the context explicitly indicates otherwise. Furthermore, the procedures can be combined with one another, unless expressly indicated otherwise.

[0053] Numerical values are generally not to be understood as exact values, but also include a tolerance of + / - 1% to + / - 10%.

[0054] To the extent that standards, specifications, or the like are mentioned in this application, reference is always made to the standards, specifications, or the like applicable on the filing date. This means that if a standard / specification, etc., is updated or replaced by a successor, the invention is also applicable to it.

[0055] Various embodiments are shown in the figures.

[0056] In one embodiment of the invention, a device 1 for a medical treatment device for measuring the flow of liquids in a lumen S to be inserted comprises a receptacle D and a first ultrasonic transducer US1. By way of example, reference is made to the Figure 1 without lumens and the Figures 2 , 3a and 3b with Lumen S. Ultrasonic transducers are available in various designs, but the invention particularly encompasses piezoelectric transducers.

[0057] The medical treatment device is, in particular, a blood treatment device, such as a device for oxygenating blood or a device for removing soluble components from blood, such as a blood dialysis machine. Dialysis is to be understood broadly and can include, in particular, hemodialysis, hemodiafiltration, peritoneal dialysis, hemoultrafiltration, apheresis, etc., i.e., in particular, any form of renal or liver replacement therapy.

[0058] The receptacle D in the device 1 has a first guide side A and a second guide side P, so that an inserted lumen S has an approximately trapezoidal shape in lateral projection, wherein the first ultrasonic transducer US1 is arranged at a first trapezoid corner, and wherein the first ultrasonic transducer US1 is designed in operation to carry out a measurement in or against the flow direction in the lumen S.

[0059] It should be noted that the exact direction of the measurement by means of the first ultrasonic transducer US1 is left to the discretion of the person skilled in the art, so that the arrangement sketched in the figures (shown in a triangular shape) is only exemplary. This means that, in particular, the ultrasonic transducer can also be arranged such that the measurement direction is not in the direction of one of the horizontally shown arrows; it would also be conceivable that the direction of the measurement is in the direction of the dashed line in Figure 2 could be measured.

[0060] Furthermore, it should be noted that trapezoidal is used only to describe spatial orientations, to illustrate the guidance of the lumen, where sections meet at an angle other than 90°. This is illustrated in the figures by the angle α.

[0061] It should also be noted that the measurement principle can be designed differently. In addition to the time-of-flight measurement principle, it is also possible to determine the flow velocities of the (medical) fluid under investigation in the lumen S using the Doppler method (frequency shift due to (back)scattering from a moving object), but this is not limited to this method.

[0062] This design provides high measurement resolution for different lumen diameters while being easy to handle.

[0063] In one embodiment of the invention, the device 1 further comprises a second ultrasonic transducer US2, wherein the second ultrasonic transducer US2 is arranged at a second trapezoid corner, and wherein the second ultrasonic transducer US2 is designed in operation to carry out a measurement in or against the flow direction in the lumen S in the opposite direction to the first ultrasonic transducer US1.

[0064] This design offers the advantage that measurements can be taken in both the flow and counterflow directions, thus providing greater measurement accuracy. Such a measurement can be carried out either independently, i.e. by reflection from one ultrasonic transducer into the lumen and from there back to the same ultrasonic transducer, or dependently, i.e. by transmission from one ultrasonic transducer through the lumen to the other ultrasonic transducer. This can depend on the distance between the ultrasonic transducers, the type of lumen, the measurement frequency, or the liquid to be measured or its components, etc. Obviously, targeted control can also enable alternating operation of ultrasonic transducers in transmission or reflection.

[0065] Since measurements from different directions are now possible, measurement results can be included in a common calculation and also used for averaging.

[0066] According to one embodiment of the invention, the fluid to be measured is blood.

[0067] Special requirements are placed on the measurement of blood properties. This means that the device can be used in particular for medical blood treatment devices, such as a device for oxygenating blood, e.g., for devices for cardiac and / or pulmonary support or replacement therapy, or a device for removing (soluble) components from blood, such as a blood dialysis machine. Dialysis is to be understood broadly and can include, in particular, hemodialysis, hemodiafiltration, peritoneal dialysis, hemoultrafiltration, apheresis, etc., i.e., in particular, any form of renal or liver replacement therapy.

[0068] According to one embodiment of the invention, the fluid to be measured is blood, another biological fluid or dialysis substitute or a medical fluid such as a liquid medication or a mixture of the aforementioned fluids.

[0069] Thus, the device can be used in particular for blood treatment devices, e.g. dialysis and apheresis devices, and in the context of extracorporeal blood circuits, e.g. for devices for heart and / or lung support or replacement therapy.

[0070] According to one embodiment of the invention, the fluid to be measured is dialysate or another physiological replacement fluid or a medical fluid such as a liquid medication or a mixture of the aforementioned fluids.

[0071] This means that the device can be used in particular for blood treatment devices such as dialysis machines, dialysis donation systems and apheresis devices.

[0072] In a further embodiment of the invention, the liquid to be measured is liquid food, e.g. for tube feeding.

[0073] In a further embodiment of the invention, the device further comprises a clamp that can selectively interrupt an inserted lumen S by clamping it off.

[0074] This makes it possible to provide not only measurement functions but also switching functions, for example, in the event of a detected error. For example, air in the lumen S can be a reason for stopping a treatment using a blood treatment device.

[0075] Furthermore, by providing a clamp in the device, the process of inserting a lumen can be simplified, since such a clamp often has to be positioned in the flow path further along the lumen S, e.g., in a blood treatment device. This integrated arrangement allows for the elimination of work steps, thus reducing setup times.

[0076] A suitable clamp can be integrated into the device 1. For example, a clamp - shown as triangles in Figure 2 - be integrated at a suitable location. Preferably, the clamp does not exert any pressure on the ultrasonic transducers US1 and US2.

[0077] According to a further embodiment of the invention, the trapezoid is isosceles, as shown in the figures by the angle α.

[0078] With an isosceles arrangement, the measuring technology can be constructed in a mirror image and thus with similar parts, which reduces development and production costs.

[0079] In yet another embodiment of the invention, the device further comprises an (external) evaluation device M for controlling and evaluating ultrasonic transducer(s). For example, as in Figure 1outlined - the evaluation device M controls the ultrasonic transducers US1, US2 and also receives data / measured values from the ultrasonic transducers US1, US2.

[0080] This means that an (integrated) unit can now be provided using the evaluation device.

[0081] According to yet another embodiment of the invention, the device further comprises at least one further sensor S1, S2, S3 for measuring a further parameter of the liquid. The sensors S1, S2 can be arranged individually or as a group S3. For example, the sensor S1 can be a temperature sensor, while the sensor S2 is a reflective optical sensor, or the sensor S3 could be a transmissive optical sensor. Such sensors can be used to determine, for example, air bubbles, components and their concentrations, density, temperature, etc.

[0082] By integrating additional sensors, cost-effective assemblies with additional measuring properties can be constructed.

[0083] In a further embodiment of the invention, the device is further configured to detect microbubbles in the liquid located in an inserted lumen S, e.g., by means of fluctuations in measured flows.

[0084] Microbubbles can be a sign of incipient problems or errors, so detecting microbubbles increases safety. The fact that the arrangement allows for measurement on a larger volume of liquid than in the almost vertical (or at an angle of 45°) measuring arrangements is advantageous. This means that a larger volume can be measured simultaneously for the presence of microbubbles. In a variant of the embodiment, the presence of microbubbles is determined based on fluctuations in the measurement signal from which the flow is determined (e.g., transit time difference of sound signals with and against the flow direction). However, this does not necessarily mean that the presence of microbubbles is determined directly from the measured variable obtained in this way. Instead, an additional variable is used to evaluate the fluctuations in the measurement signal. This additional measured variable can, for example, be amplitude information from the transmitted ultrasound signal.

[0085] According to yet another embodiment of the invention, as shown in Figure 1 and 2 visible - the first guide side A and the second guide side P can be moved relative to each other.

[0086] This allows for a particularly wide range of lumen diameters. The contact pressure can also be adjusted to suit the application, allowing the US1 and US2 ultrasonic transducers to be used within a favorable operating range.

[0087] In yet another embodiment of the invention, the first guide side A and the second guide side P exert a defined force, in particular an adjustable force, on an inserted lumen S.

[0088] It should also be noted that a locking mechanism can also be provided so that, for example, a certain contact pressure can be maintained.

[0089] This allows the ultrasonic transducer to provide measurements with high accuracy within a favorable operating range.

[0090] According to yet another embodiment of the invention, a receptacle is designed for different diameters of insertable lumens S.

[0091] It should be noted that the provision of a disposable lumen device provides significant advantages, as only a few parts now need to be simply sterilized.

[0092] In yet another embodiment of the invention - as in Figures 3a and 3bAs shown, the first guide side A and the second guide side P can be moved together in a drawer-like manner relative to a housing G. This drawer-like configuration provides the desired forced path for the lumen S when the drawer is inserted together with the housing G, so that all of the aforementioned advantages can also be realized in this embodiment. Although the forced path is described above as trapezoidal, this does not preclude the possibility of providing a W-shape, a V-shape, or an S-shape in sections.

[0093] Without limiting its generality, the receptacle D can also be constructed from multiple (injection-molded) components. For example, a trough-like lower part can be provided into which an upper part, into which the lumen S can be easily inserted (e.g., laterally / normally to the insertion direction), is inserted (linearly). The ultrasonic transducers US1, US2 can be arranged on the upper part or on the lower part. It is only important that the ultrasonic transducers US1, US2, when combined, rest against the lumen S for coupling.

[0094] Without limiting the generality, such an insertion movement (or contact pressure) can be provided manually or assisted or automated (by means of spring forces, electric drives, compressed air, etc.).

[0095] According to a further embodiment of the invention, an ensemble comprising a measuring device according to the invention and a lumen is also provided.

[0096] This design provides high measurement resolution for different lumen diameters while being easy to handle.

[0097] According to one embodiment of the invention, the lumen S is a disposable tube, in particular a disposable tube for a medical fluid, such as blood, a dialysis inlet, a permeate inlet, a dialysate outlet, etc.

[0098] In one embodiment of the invention, the lumen S is elastic. In particular, the lumen S can be made of a suitable optically transparent material.

[0099] This means that conventional hose systems as well as disposable items can also be combined with the device according to the invention.

[0100] It should be noted that when measuring with ultrasound, i.e., using ultrasonic transducers US1 and US2, coupling is an important aspect. Coupling depends on the impedance between the lumen S and the ultrasonic transducers US1 and US2. The impedance is significantly dependent on the presence of air. This means that if the lumen S is pressed against the ultrasonic transducer(s) US1 and US2 with sufficient force, the presence of air between the lumen S and the ultrasonic transducers US1 and US2 is minimal, resulting in good coupling.

[0101] In previous clamping arrangements, which provided for coupling or measurement perpendicular to the flow direction or perpendicular but slightly offset (up to 45°), the contact pressure caused a deformation of the lumen, so that although it contacted the ultrasound transducers better, the contact pressure (caused by the elasticity of the lumen) was also negative for the measurement. In addition, the contact pressure for different lumens was highly dependent on the size of the lumen, the thickness of the lumen and the material of the lumen. This means that the variance of the lumens made it almost impossible to provide equally good measurement results for all differently usable lumens. In the past, this led to only a small subset being approved for use with a specific measuring device.In addition, a measuring arrangement often had to be calibrated to the respective individual hose type, which in itself presented a difficulty.

[0102] In contrast to the prior art, the measuring section is now oriented perpendicular to the guide / fixation, thus solving the problems of coupling, measuring range, and lumen variability. Furthermore, the device according to the invention also makes it possible to vary the contact pressure during an ongoing treatment / measurement. Depending on the measurement, a measurement signal from the ultrasound transducer or a sensor S1...S3 can be fed back, for example, to variably adjust the contact pressure so that a desired signal range can be achieved.

[0103] Since the invention now allows for measurement in / against the flow direction, the measurement intervals for transit time differences can be increased. This results in a better signal-to-noise ratio. The longer measurement path also reduces the requirements for the necessary time resolution when measuring the transit time difference, which enables more cost-effective implementations.

[0104] Unlike previous approaches, it is also possible to not only qualitatively detect microbubbles but also quantify them. Due to the longer measurement length and the effects that occur when air enters and exits, as well as during the longer residence time in the measurement section, air can be more effectively detected and quantified. An integral volume observed in the measurement section – in contrast to the purely 2-dimensional cross-sections used in the previous state of the art – results in easier determination of air volumes.

[0105] The ratio of hose wall to measuring section is optimized during the adjustment process. This results in measurements that are less dependent on hose wall tolerances. In particular, a larger portion of the measuring section remains undeformed, since no sensor coupling is required at the largest portion.

Claims

1. A device (1) for a medical treatment apparatus for measuring the flow of liquids in a lumen (S) to be inserted, having a receptacle (D) and a first ultrasonic transducer (US1), wherein the receptacle (D) in the device (1) has a first guide side (A) and a second guide side (P), so that an inserted lumen (S) has approximately a trapezoidal course in lateral projection, wherein the first ultrasonic transducer (US1) is arranged at a first trapezoid corner, and wherein the first ultrasonic transducer (US1) in operation is designed to perform a measurement in or against the direction of flow in the lumen (S), respectively.

2. The device (1) for measuring according to claim 1, characterized in that the device (1) furthermore has a second ultrasonic transducer (US2), wherein the second ultrasonic transducer (US2) is arranged at a second trapezoid corner, and wherein the second ultrasonic transducer (US2) in operation is designed to perform a measurement in or against the direction of flow in the lumen (S), respectively, in the opposite direction to the first ultrasonic transducer (US1).

3. The device for measuring according to one of the preceding claims, characterized in that the liquid is blood, another biological liquid, or a physiological replacement liquid, such as dialysate, dialysis substituate, or a medical liquid, such as a liquid medicine or a mixture of the above-mentioned liquids or liquid food.

4. The device for measuring according to one of the preceding claims, characterized in that the device furthermore has a clamp, which can selectively interrupt an inserted lumen by means of cross-clamping.

5. The device for measuring according to one of the preceding claims, characterized in that the trapezoid is isosceles.

6. The device for measuring according to one of the preceding claims, characterized in that the device furthermore has an external evaluation means (M) for controlling and evaluating ultrasonic transducers.

7. The device for measuring according to one of the preceding claims, characterized in that the device furthermore has at least one further sensor (S1, S2, S3) for measuring a further parameter of the liquid.

8. The device for measuring according to one of the preceding claims, characterized in that the device is furthermore configured to recognize micro-bubbles in the medical liquid, which is located in an inserted lumen.

9. The device for measuring according to claim 8, characterized in that the device is furthermore configured to recognize micro-bubbles in the medical liquid on the basis of fluctuation in measured flows.

10. The device for measuring according to one of the preceding claims, characterized in that the first guide side (A) and the second guide side (P) can be displaced relative to one another.

11. The device for measuring according to claim 10, characterized in that the first guide side (A) and the second guide side (P) exert a defined force on an inserted lumen (S).

12. The device for measuring according to claim 10 or 11, characterized in that the first guide side (A) and the second guide side (P) exert a settable force on an inserted lumen (S).

13. The device for measuring according to one of the preceding claims, characterized in that the one receptacle (D) is designed for various diameters of insertable lumens (S).

14. The device for measuring according to one of the preceding claims, characterized in that the first guide side (A) and the second guide side (P) can be displaced jointly relative to a housing (G) in a drawer-like manner.

15. An ensemble with a device for measuring according to one of the preceding claims and a lumen (S).

16. The ensemble according to claim 15, characterized in that the lumen (S) is a disposable hose.

17. The ensemble according to claim 15 or 16, characterized in that the lumen (S) is elastic.