CLAMPING ELEMENT FOR A PUMPING DEVICE

Description

Technical field

[0001] The invention relates to a clamping element for fixing a hose according to the preamble of claim 1, a pumping device for a medical device according to the preamble of claim 8, a blood treatment device according to the preamble of claim 13, and a hose set according to the preamble of claim 14. background

[0002] Peristaltic pumps, also known as hose pumps, are a well-known type of pump used in the medical field. They are frequently used to transfer fluids. In particular, hose pumps are used in dialysis machines, where the pumped fluid might be blood, dialysis fluid, a drug solution for administering medication into the patient's bloodstream (such as heparin, citrate solution, iron complex solutions, or other medications), or a substitution agent. The pump works by means of occlusion rollers attached to a rotor, which convey a fluid contained within a hose. The hose is positioned between the rotor and a stator. The fluid is conveyed circumferentially by the occlusion rollers, with positive pressure downstream of an occlusion roller and negative pressure upstream of an occlusion roller.A peristaltic pump typically has two or four of these occlusion rollers arranged radially around the rotor. The pressures present in a peristaltic pump place stress on both the fluid being pumped and the tubing. Particularly high stresses can occur on the tubing at the pump's inlet and outlet.

[0003] Since modifying the rotor or stator of a peristaltic pump involves significant design effort, and the service life of medical devices is long due to approval requirements, it is desirable to avoid modifications to the rotor or stator.

[0004] Similarly, reinforcement elements can only be applied to the hose itself to a very limited extent. Medical hoses for use in dialysis machines must meet particularly high hygiene and safety standards. Furthermore, as disposable items, hoses are subject to significant cost pressure.

[0005] EP1763636B1 describes a roller pump with a rotor that acts on a hose laid in an arc shape within the pump bed or is fixed in the roller pump by a connector. The roller pump housing has two differently shaped clip receptacles on the side for the connector, which is adapted to its shape; one clip receptacle is in the shape of a rounded arc and the other is rectangular.

[0006] Further relevant prior art is disclosed, for example, in documents GB2290582 A and US5533877 A.

[0007] One object of the present invention is to reduce the stress on the conveyed fluid and the hose used. Summary of the invention

[0008] The problem according to the invention is solved by a clamping element with the features of claim 1, a pumping device with the features of claim 8 and a blood treatment device with the features of claim 13.

[0009] The clamping element for securing a hose has a first guide and a second guide for receiving the hose. The two guides converge towards each other, and the clamping element is designed such that it can be connected to a pump device, allowing the hose to be guided through the two guides at the pump inlet and outlet.

[0010] By arranging the guides, which are preferably spaced further apart in one direction towards the rotor than in a direction further away from the rotor, a hose guide is preferably achieved in which the hose is inserted at an angle of less than 120°, preferably less than 90°, preferably less than 45° to a tangent on the rotor. The tangent can be formed, for example, at the point where the hose is inserted onto the rotor. For example, the tangent can be formed at the point where the hose is first guided on the circumference of the rotor.

[0011] In a preferred embodiment, the clamping element can be connected to a pumping device such that the hose runs essentially tangentially to a rotor of the pumping device, at least at the pump inlet and / or outlet. This ensures that the hose is fed tangentially to the rotor of the pumping device. The force exerted by the rotor on the hose is therefore not abrupt, but rather increases continuously. Furthermore, the tangential feed prevents strong shear forces within the hose itself.

[0012] The tubing to be used is specifically designed for medical applications, particularly for dialysis treatment, for example, a tubing for extracorporeal circulation to convey blood. Tubing intended for medical applications must meet particularly high hygiene standards. These tubings are often made of PVC and preferably have no coating. Coatings could detach during treatment, posing a risk of particles entering the system. This limits the types of reinforcement elements that can be applied to the tubing. By using tangential tubing insertion, design features can be implemented to prevent high stress on the tubing and the fluid it carries, such as blood.

[0013] The two guides can be designed as recesses, for example, groove-shaped with a constant or changing cross-section; as projections, for example, with lateral constraints for hose positioning; or as geometric recesses or constraints for hose positioning on the clamping element. The guides can extend over the entire surface of the clamping element or only over a portion of the surface. The guides can also have a radius corresponding to the outer radius of the inserted hose. However, the radius can also be larger or smaller, or vary along the guides' path. The guides can be designed such that an inserted hose is held at only two points, i.e., at specific points; alternatively, the guides can be designed such that the hose is held linearly or over a surface.

[0014] Similarly, the guides can be almost triangular in shape when viewed from above. These guides determine the position of an inserted hose relative to the clamping element. The guides can be identical or different in shape. The guides on the clamping element are designed such that, when the clamping element is inserted into a pumping device, a hose guide is created at least at the pump inlet or outlet. This guide directs the hose to or from the pumping device in a defined position. The hose can be completely secured by the clamping element alone or through a combination of the clamping element and the pumping device. In particular, the clamping element, with the aid of the guides, contributes to securing the hose through a clamping function.Traditionally, part of the hose fixation is already handled by the pump device itself.

[0015] The clamping element according to the disclosure is preferably designed such that the two guides form a loop around a hose that is at least in the area of ​​a pump device, including the pump inlet and outlet. Thus, it is unnecessary, as in EP1763636B1 cited above, to insert an arc-shaped or loop-shaped hose into the pump bed, which is designed as a disposable item separate from the rest of the hose. Furthermore, according to this preferred embodiment of the disclosure, an adhesive and / or push-fit connection to a connector or the clamping element is unnecessary. Instead, the clamping element enables the fixing of a one-piece or continuous hose without the need for adhesive or push-fit connections. In EP1763636B1, the connector is clamped, but not the hose. However, in EP1763636B1, the hose itself or hose sections are inserted into the connector and / or glued.

[0016] The two guides can be further designed in relation to each other such that, with an imaginary extension of the guides, an angle between them of 5° to 90°, preferably of 10° to 60°, more preferably of 25° to 50°, is formed.

[0017] Following further training, the clamping element can be at least partially elastic, in particular a first side section of the clamping element can be elastic.

[0018] A clamping element that is at least partially elastic facilitates its connection to the pumping device. The clamping element can be elastic on at least one side, allowing for easy insertion and removal from the pumping device. The clamping element can therefore be made of an elastic material, such as a flexible plastic. In other words, a thermoplastic elastomer, silicone, or rubber can be used.

[0019] Following further development, the clamping element can have at least one connecting element for connecting to a pumping device, in particular a projection, preferably a pin-shaped projection. The connecting element can be formed on a second side section opposite the first side section.

[0020] The connecting element can be designed such that it allows for a detachable connection of the clamping element to the pumping device. In other words, the connecting element is a geometrically shaped element on the clamping element such that, when the clamping element is connected to the pumping device, at least the position in one dimension between the clamping element and the pumping device is uniquely defined. In other words, the connecting element can be a groove-shaped recess on the clamping element or a spring-shaped projection.

[0021] The connecting element can also be designed as a pin-shaped projection or a pin-shaped recess on the clamping element. Preferably, the connecting element is formed on a second side section, which is opposite the first side section. This further simplifies the assembly of the clamping element. In particular, this allows the clamping element with the second side section to be inserted first, and a connection to be made by means of the connecting element, so that the elastic first side section makes it easy to fully insert the clamping element.

[0022] According to the invention, the two guides are formed on a first section, wherein the first section can preferably be rotated about a rotation axis of a second section.

[0023] In other words, the clamping element has at least two sections that are movable relative to each other. A pivot axis can be formed or mounted on the second section. The first section, on which the guides are formed, can be rotatably connected to the second section about this pivot axis. The pivot axis can be integral to the second section. For example, the pivot axis can have two pin-shaped projections to which the first section can be connected, for example, by being plugged in.

[0024] Alternatively, a pivot axis can be mounted in the second section, around which the first section can rotate. Such a connection allows the position between the first and second sections to be changed. In particular, the first section can be tilted on the second section in such a way that the first section changes the position of the guides relative to the second section and thus relative to the pumping device.

[0025] According to further development, the first section can preferably be pre-tensioned in a first position by means of a spring, in particular a coil spring, wherein in the first position the first section is at least partially spaced away from the second section.

[0026] After further training, the axis of rotation of the first section can be located on the second section.

[0027] After further training, the axis of rotation can be mounted on the second section and the spiral spring on the axis of rotation.

[0028] In other words, the clamping element has two sections that are movably arranged relative to each other. A spring element can be formed on the first and / or second section, which biases the first section against the second. Alternatively, the spring element can be connected to the pivot axis located on the second section. In particular, a coil spring can be positioned on the pivot axis so that the first section is tilted relative to the second section. This allows, for example, the force acting on an inserted hose to be varied. Thus, the first section can be pressed towards the second section during hose insertion. Similarly, hoses of different diameters can be securely held by making the distance between the first and second sections variable.

[0029] Following further training, the first and / or second guide can be grooved. Alternatively, or alternatively, the first and / or second guide can grip the hose on two opposite sides.

[0030] In other words, at least one guide can be groove-shaped, with a cross-section spanning a circular sector of less than 180°, in particular a circular sector of less than 90°, in particular a circular sector of less than 45°, in particular a circular sector of less than 30°. Likewise, at least one guide can be groove-shaped, with a cross-section spanning a circular sector of 180° or larger. Alternatively, at least one guide can have two opposing side walls and be approximately U-shaped. Alternatively, at least one of the guides can have an omega shape, so that the hose can be pressed into the guide.

[0031] Following further development, a projection can be assigned to the clamping element. This projection can preferably extend above the first guide and / or the second guide, so that a hose can be clamped between the first guide and the projection and / or between the second guide and the projection. The projection can be formed integrally with the clamping element. Likewise, the projection can be assigned to a pump device or pump housing and interact with a clamping element connected to the pump device. The projection allows the hose to be fixed between the clamping element and the projection by frictional adhesion. This prevents the hose from shifting after it has been inserted. For example, the clamping element can be L-shaped.

[0032] In other words, the extension allows the hose to be held by a further section of the extension formed around the hose's circumference. This improves the hose's retention. In particular, the extension can be formed at a point opposite a guide, thus enabling the hose to be clamped. The extension can be formed on both the first and second sections of the clamping element. Preferably, the extension is formed on the second section. If the first section is movable relative to the second section or pre-tensioned, the distance between the extension and the first section can be changed, or the hose can be clamped between the extension and the first section by means of spring force.

[0033] Furthermore, a pump device may be provided for a medical device which has a clamping element according to one of the preceding aspects.

[0034] According to a further development, the pumping device further comprises a pump housing with a pump bed, a rotor which is formed in the pump bed and on which at least one occlusion element is arranged, wherein a hose can be inserted between the pump bed and the rotor in such a way that it is pressed radially against the pump bed by the occlusion element, so that fluid can be transported in the hose when the rotor rotates, a pump inlet which is formed in the pump housing in which the hose is fed to the pumping device, and a pump outlet which is formed in the pump bed in which the hose is led out of the pumping device.

[0035] After further training, the clamping element can be inserted into the pump housing in such a way that the clamping element forms part of a hose guide and the clamping element enables the hose to be fixed at the pump inlet and at the pump outlet.

[0036] In other words, the clamping element can form a section of the hose routing at the pump inlet and outlet. Part of the hose routing can be formed by the clamping element, and part by the pump housing. Alternatively, the hose routing at the pump inlet and outlet can be defined solely by the clamping element. For example, the pump housing can have projections at the pump inlet and / or outlet that form part of the hose routing. This interaction between the pump housing and the clamping element allows for a defined hose routing.

[0037] Following further development, the hose routing at the pump inlet and / or outlet, preferably through the clamping element, can be configured such that the first and second guides converge towards each other, resulting in a greater distance between them in the direction of the rotor. In other words, the guides on the clamping element can be spaced further apart on a section closer to the pumping device, for example, the rotor, than on a section farther away. Alternatively, or in the same way, the hose routing at the pump inlet and / or outlet, preferably through the clamping element, can be configured such that the hose can be fed in tangentially to the rotor.

[0038] Following further development of the pump device for a medical device, the pump inlet and pump outlet can be designed by the pump housing and clamping element in such a way that the hose can be fixed to the pump inlet and / or pump outlet on opposite sides.

[0039] Furthermore, a blood treatment device can be provided with a pump device according to the preceding aspects as well as a clamping device according to the preceding aspects.

[0040] The blood treatment device can be configured as a dialysis device, hemodialysis device, hemofiltration device, hemodiafiltration device, apheresis device, or plasma treatment device.

[0041] Likewise, a tubing set, preferably for extracorporeal blood treatment, preferably dialysis treatment, can be provided. A section of tubing for extracorporeal blood treatment, preferably dialysis treatment, can be connected to a clamping element according to the invention. The tubing can be connected to the first guide and / or the second guide before being inserted into a blood treatment device. If the tubing is not connected to both guides, it can be connected to the other guide after the clamping element has been inserted into the blood treatment device.

[0042] The clamping element, pumping device, or blood treatment device according to the invention thus makes it possible to reduce the forces acting on the tube and the medium contained within it. In particular, the angled or tangential entry of the tube into the pumping device, relative to the rotor, results in lower forces. This is especially true because the force exerted by the pumping device on the tube does not increase abruptly.

[0043] Since the hose is inserted tangentially, or circumferentially, to the rotor, i.e., along the rotational movement, the hose does not experience an abrupt change of direction. Instead, the hose is inserted circumferentially, resulting in a gradual increase in the force acting on the hose. In other words, an occlusion element engages the hose with a continuously increasing force. Avoiding a sudden force application also has a positive effect on the fluid within the hose. For example, if blood is conveyed through the hose and a sudden force is applied, this can lead to blood damage. The invention prevents such a sudden force application and thus damage to the fluid within the hose as well as to the hose itself.

[0044] Furthermore, the clamping element according to the invention makes it possible to change the inlet or outlet geometry without having to modify the pump housing itself. This provides a cost-effective and structurally simple way to achieve the desired inlet or outlet geometry for the hose in existing pump devices. Brief description of the drawings

[0045] The present invention is explained below by way of example with reference to the accompanying drawing, in which the same reference numerals denote identical or similar components. In the figures of the drawing, the following applies: Fig. 1 shows a schematic representation of a pump device; Fig. 2 shows a simplified flow diagram of a fluid system of a blood treatment device; Fig. 3 shows a schematic representation of a partial section of a front view of a blood treatment device; Fig. 4 shows a schematic representation of the clamping element in a side view; Fig. 5 shows a schematic representation of a clamping element in a top view. Detailed description of an exemplary implementation

[0046] The in Fig. 1 The pump device shown has a pump housing 14. The rotor 16, as well as the occlusion elements 15 and guide elements 17, are arranged in the pump housing 14. The pump housing 14 also has a pump bed. A hose 18 can be inserted into this pump bed, as shown in Fig. 1 shown, to be inserted. Tube 18 can be a blood tube, dialysis fluid tube, or substitution tube.

[0047] Similarly, the pumping device can also be a hose pump or a peristaltic pump and can be used as a blood pump, dialysis fluid pump, or substitution pump. Such pumps can be used in a blood treatment device 20.

[0048] Fig. 1 Figure 16 also shows additional axial guide elements 17 on the circumference of the rotor 16. These guide elements 17 serve to align the hose and, in particular, prevent the hose from slipping out of the hose bed. The axial guide elements are preferably rotatably mounted so that no friction occurs between the guide elements 17 and the hose. As shown, two guide elements 17 can be attached to the rotor 16. Likewise, several, for example three or four, or even just one guide element 17 can be provided on the rotor 16.

[0049] A cover is provided on the front of the rotor 16. The rotor can also have a handle that folds out from the rotor 16 (not shown here). Using this handle, the rotor 16 can also be rotated manually, allowing the pump to perform its pumping operations. In the Fig. 1 In the pump device shown, the clamping element 1 is already inserted into the pump device. From this perspective, therefore, only an extension 10 of the clamping element 1 is visible. This extension 10 serves to secure the hose in one direction out of the plane. As shown in Fig. 1As can be seen, the clamping element 1 enables the tube to be fed tangentially to the rotor 16. The occlusion element 15 therefore does not exert a sudden force on the tube. Rather, the force is increased gradually after the initial contact between the occlusion element 15 and the tube. This prevents blood damage that can be caused by a sudden pressure increase in the tube. Likewise, the tangential insertion of the tube avoids shear forces caused by a forced, sharp change in direction due to the occlusion element striking the tube.

[0050] Furthermore, it shows Fig. 1Occlusion elements 15 are attached to the rotor 16. These occlusion elements 15 are cylindrical and roller-shaped. Two occlusion elements 15 are shown as an example on the circumference of the rotor. However, three or four occlusion elements, or even just one, can also be provided. The occlusion elements 15 are designed to press the hose radially outwards against the pump bed. The occlusion elements can be spring-loaded for this purpose. The pressure of the occlusion elements 15 against the hose, combined with the rotation of the rotor 16, thus pumps fluid through the hose.

[0051] If a hose is inserted into the pumping device and the pumping device rotates, as described in Fig. 1As shown, the fluid is pumped clockwise through the tubing from pump inlet 12 to pump outlet 13. In the case of a blood pump, blood can be drawn from the patient and delivered via the arterial line to a dialyzer 21 using the blood pump. The dialyzer 21 has a blood chamber connected to the venous and arterial blood lines, and a dialysis fluid chamber. These chambers are separated by a semipermeable membrane. Within the dialyzer 21, the blood flows countercurrently, while the dialysis fluid flows on the opposite side. The blood side of the dialyzer 21 and the blood pump are part of the extracorporeal blood circulation.

[0052] Fig. 2Figure 1 shows a simplified flow diagram of the fluid system of a blood treatment device 20, which is used as a dialysis machine. The fluid supply to the blood treatment device 20 is provided via a dialysis water connection 22, a downstream pressure reducing valve 23, which reduces the pressure to approximately 0.5 bar, and an inlet throttle 24. Permeate, i.e., softened and filtered water, is supplied via the dialysis water connection 1.

[0053] After passing through the dialyzer 21, the dialysate is discharged via a dialysate drain line and a drain valve 25. The fresh dialysate can be heated by the dialysate via a heat exchanger 26 and subsequently heated further, for example, by a heating coil or heating element. The permeate is then degassed in a degassing chamber 27. To remove air from the permeate, it is subjected to a vacuum by means of a degassing throttle 28. The resulting temperature increase and pressure decrease allow air to escape in bubble form via a downstream air separator 29.

[0054] After degassing the permeate, the mixed fluid, in this case the dialysis fluid, is produced by adding at least one concentrate solution. To provide the fresh dialysis fluid, permeate, supplied via the dialysis water connection 22, and, for example, two concentrate solutions, such as a bicarbonate concentrate solution and an acid concentrate solution, supplied from concentrate containers (not shown here), are added and then mixed. The concentrate solutions can be pumped by concentrate pumps 30 and 31. These pumps can be, for example, piston pumps, diaphragm pumps, or gear pumps. The proportioning, that is, the mixing of acid concentrate and bicarbonate with permeate in a predetermined ratio, can be volumetrically or conductivity-controlled.In the volumetric proportioning shown in this embodiment, the supplied volume is achieved via a timed supply using the concentrate pumps 30, 31, for example reciprocating piston pumps.

[0055] The dialysate produced by the mixing process then flows through a portion of a balancing chamber 32 and thus enters the dialysate circuit. The balancing chamber 32 maintains a balance between the fresh dialysate and the used dialysate. A mixing fluid sensor 33 is located upstream of the dialyzer 21 to monitor the correct composition of the dialysate. A bypass valve 34 is located downstream of the mixing fluid sensor 33, which may be a conductivity sensor, for example. If the mixing fluid sensor 33 detects an abnormal fluid composition during dialysis—that is, a fluid that does not meet a predefined condition, such as a predefined conductivity—the bypass valve 34 opens, and the dialysate is diverted through a section of tubing 34.

[0056] The actuators, pumps and valves of the blood treatment device may be connected to, or in communication with, a control device not shown here.

[0057] Fig. 3Figure 1 shows a partial view of the front of an extracorporeal blood treatment device 20. The blood circulation system can include a tubing system through which the patient's blood flows during treatment. This tubing system can be inserted into a dialysis machine for treatment and interact with modules, such as blood modules of the dialysis device. The blood module can include an arterial patient tubing clamp 29 of an arterial segment of an arterial blood vessel. As described, blood is drawn from the patient via an arterial connection needle and returned via a venous connection needle. Similarly, the blood module can also include a venous patient tubing clamp 26, with blood downstream of this clamp being returned to the patient via the venous connection needle.

[0058] The in Fig. 3The partial section of the blood treatment device 20 shown here has three tubular pumps 11 from top to bottom, the first being a single-needle pump, the second a blood pump, and the third a substitution pump. An extracorporeal blood treatment device can have all three tubular pumps, but also only one blood pump or only one blood pump and one substitution pump. The substitution pump can deliver the substitution fluid via predilution or postdilution of the arterial or venous bloodstream.

[0059] Furthermore, an injection point for heparin or another anticoagulant may be provided. The blood treatment device may thus include a heparin pump 21, an arterial pressure measuring unit 28, and sensors 25, 27. These sensors 25, 27 monitor the tubing for air bubbles and its contents. An ultrasonic sensor and an optical sensor for color detection may be provided. Finally, the blood treatment device includes an arterial pressure measuring unit 28 and a venous pressure port 23.

[0060] Fig. 4 Figure 1 shows a clamping element 1 according to the invention in a side view. The clamping element can be connected to one of the previously described peristaltic pumps 11. In particular, the hose routing at the pump inlet 12 and pump outlet 13 can be formed by inserting the clamping element 1 into the pump housing 14. For this purpose, the clamping element 1 is connected via a connecting element 6 (as shown in Figure 1). Fig. 4The clamping element 1 (shown as a projection) is connected to the pump housing 14. For this purpose, a corresponding recess or groove can be formed in the pump housing 14. Alternatively, a projection can be formed on the pump housing 14 and a corresponding recess or groove on the clamping element 1, which serves as the connecting element 6. In other words, a positive-locking connection can be formed between the clamping element 1 and the pump housing 14. Likewise, a magnetic connection can be formed between the clamping element 1 and the pump housing 14.

[0061] For easy assembly, the clamping element 1 is first inserted at an angle into the pump housing 14 with the second side section 5, on which the connecting element 6 is formed. The clamping element 1 can then be fully inserted by simply pressing it in. This is particularly possible because the second side section 4 can have an elastic element. For this purpose, as shown in Fig. 4As shown, an elastic side plate is formed on the second side section 4. This can be made of an elastic plastic. In other words, a thermoplastic elastomer, as well as silicone or rubber, can be used.

[0062] To remove the clamping element 1 from the pump housing 14, the clamping element can be grasped via a projection 10 and pressed towards the second side section 5. The clamping element 1, together with the first side section 5 containing the elastic element, can then be lifted first and subsequently completely removed from the pump housing 14.

[0063] The extension 10 formed on the clamping element 1 is formed, in particular, above the first guide 2. Additionally or alternatively, an extension can also be formed above the second guide 3. The extension 10 can extend from a first section 7 or a second section 8 of the clamping element 1. Preferably, the extension 10 extends from the second section 8, which, in the installed state of the clamping element 1, is located relative to the pump housing. 14 It is designed to be immobile. The extension 10 is particularly suitable for fixing a hose on at least two sides.

[0064] Thus, the extension can secure the hose from above, and the first guide 2, or second guide 3, can secure the hose from below. The hose can be secured from one side, relative to the one in Fig. 4In the illustrated embodiment, the hose is inserted from the left side and held from the top, i.e., from a direction leading away from the pump housing 14. Alternatively, or in the same way, the hose can be fixed at three points or over a surface. The extension 10 can have an arc shape on its underside, which faces the first guide 2 or the second guide 3. The radius of the arc shape can correspond to the radius of a conventional hose. In particular, the radius can be 5 mm to 30 mm, and especially 10 mm to 20 mm.

[0065] The first guide 2 and / or the second guide 3 can have a semicircular cross-section or a cross-section greater than 180°. Likewise, the first guide 2 and / or the second guide 3 can have a quarter-circle or a larger cross-section. In particular, the first guide 2 and / or the second guide 3 can have an arc shape of 20° to 270°, preferably 30° to 180°, more preferably 35° to 90°, and even more preferably approximately 45°.

[0066] The in Fig. 4 The clamping element 1 shown can be connected to a hose after being inserted into the pump housing 14. In particular, the hose can be inserted into the first guide 2 and the second guide 3. Alternatively, a Fig. 4The hose (not shown) may already be connected to the clamping element 1 before insertion. The clamping element may be part of a hose set or hose assembly. In this case, the hose and clamping element may be disposable.

[0067] For example, the hose can be connected in a loop to the first guide 2 and the second guide 3 before being inserted into a pump housing 14. Alternatively, the hose can be connected to only one of the guides 2, 3 before insertion and then connected to the other guide 2, 3 after insertion into the pump housing 14. If the hose is already connected to the clamping element 1 before insertion, this simplifies handling. In particular, the clamping element 1, with the hose already inserted, reduces the number of handling steps. This is especially advantageous because the time required to set up a dialysis device must be limited to a specific timeframe without jeopardizing the strict schedule.

[0068] Fig. 5Figure 1 schematically shows the clamping element 1 in a top view. The shape of the guides 2, 3 is projected onto a plane, forming an almost triangular form. In the embodiment shown here, the projection 6, for connecting the clamping element 1 to the pumping device, is formed at the edge of the clamping element 1. Alternatively, the projection 6 can also be located centrally, or several projections 6 can be formed at different locations.

[0069] The clamping element 1 can further have a pivot axis (not shown here). This pivot axis can be formed in the second section 8. Likewise, the second section 8 can have a spring (not shown here). This spring can be mounted as a coil spring on the pivot axis. The first section 7 can be rotatably connected to the second section 8 about this pivot axis. This allows for preloading of a hose inserted into the guides 2, 3 against the extension 10 or elements of the pump housing.

Claims

1. A clamping element (1) for securing a tube, having a first guide (2) and a second guide (3) for receiving a tube, wherein the two guides (2, 3) run towards each other, and the clamping element (1) is designed in such a manner that it can be connected to a pump device (11) such that a tube guide can be formed by the two guides at a pump inlet (12) and a pump outlet (13) of the pump device (11), characterized in that the clamping element has at least a first portion and a second portion which can be moved relative to each other, wherein the two guides (2, 3) are formed on the first portion (7), wherein the first portion (7) can preferably be rotated about an axis of rotation of the second portion (8), wherein the first portion (7) is preferably biased in a first position by means of a spring, in particular a spiral spring, wherein in the first position the first portion (7) is at least partially spaced apart from the second portion (8).

2. The clamping element according to claim 1, wherein the clamping element (1) is at least partially elastic, in particular a first side portion (4) of the clamping element (1) is elastic.

3. The clamping element according to claim 1 or 2, wherein the clamping element (1) has at least one connecting element (6) for connecting to a pump device, in particular a protrusion, in particular a pin-shaped protrusion, wherein this connecting element (6) is preferably formed on a second side portion (5) which lies opposite the first side portion (4).

4. The clamping element for securing a tube according to at least one of claims 1 to 3, wherein an axis of rotation about which the first portion (7) can be rotated is arranged on the second portion (8).

5. The clamping element for securing a tube according to claim 4, wherein the axis of rotation is mounted on the second portion (8) and the spiral spring is mounted on the axis of rotation.

6. The clamping element for securing a tube according to at least one of claims 1 to 5, wherein the first and / or second guide (2, 3) is groove-shaped and / or wherein the first guide (2) and / or the second guide (3) receives the tube on two opposite sides of the tube.

7. The clamping element for securing a tube according to at least one of claims 1 to 6, wherein the clamping element is assigned at least one extension (10) which extends above the first guide (2) and / or the second guide (3) such that a tube can be clamped between the first guide (2) and the extension (10) and / or the second guide (3) and the extension (10).

8. A pump device for a medical device, having a clamping element (1) according to at least one of claims 1 to 7.

9. The pump device according to claim 8, further having a pump housing (14) with a pump bed (12), a rotor (16) which is arranged in the pump bed (12) and on which at least one occlusion element (15) is arranged, wherein a tube can be inserted between the pump bed (12) and the rotor (16) in such a way that it is pressed radially against the pump bed (12) by the occlusion element (15), such that fluid can be transported in the tube when the rotor (16) rotates, a pump inlet (12) which is formed in the pump housing (14) into which the tube of the pump device is fed, and a pump outlet (13) which is formed in the pump bed, in which the tube is fed out of the pump device.

10. The pump device according to claim 8 or 9, wherein the clamping element (1) can be inserted into the pump housing (14) in such a way that the clamping element (1) forms part of a tube guide and the clamping element (1) enables the tube to be fixed at the pump inlet (12) and at the pump outlet (13).

11. The pump device according to at least one of claims 8 to 10, wherein the tube guide at the pump inlet (12) and / or pump outlet (13) takes place, preferably by the clamping element, in such a way that the first guide (2) and the second guide (3) run towards each other in such a way that the first guide (2) and the second guide (3) are spaced apart further in the direction of the rotor (16), such that a tube can preferably be supplied tangentially with respect to the rotor (16).

12. The pump device according to at least one of claims 8 to 11, wherein the pump inlet (12) and the pump outlet (13) are formed by the pump housing (14) and clamping element (1) in such a way that a tube can be secured at the pump inlet (12) and / or at the pump outlet (13) on at least two tube sides, in particular on at least two opposite tube sides.

13. A blood treatment device having a pump device according to at least one of claims 8 to 12.

14. A tube set having a clamping element according to any one of claims 1 to 7, preferably for use in a pump device according to one of claims 8 to 12.