Peristaltic pump for delivering medical fluids

Abstract

The present invention relates to a delivery device (100) for delivering a medical fluid conducted in a tube (30). The delivery device comprises a rotor (10) and a stator (20). The stator (20) comprises at least one stator bottom (21), a space for receiving the tube (30), and a tube seat (22) as an abutment for an occlusion device (1). The rotor (10) comprises at least one rotor shaft (7) and at least two occlusion devices (1) radially attached to the rotor shaft or rotor shaft (7) and intermittently compressing the tube (30) against the abutment during use of the delivery device (100). The rotor (10) includes at least one axial guide element (6) for the tubes (30) for orienting or centering the tubes (30) within the stator (20), the axial guide element being rotatable about its longitudinal axis, the longitudinal axis of the axial guide element (6) running parallel to the longitudinal axis of the rotor shaft (7). The axial guide element (6) includes at least one central portion (6c) and at least one first lateral portion (6a) that projects radially beyond the central portion (6c). The at least first lateral portion (6a) is rotatably mounted. Furthermore, the first lateral portion (6a) projects radially beyond a portion of the outer edge of the rotor (10).

Description

[Technical Field]

[0001] The present invention relates to a medical transport device for transporting a fluid guided in a hose according to claim 1. The invention further relates to a blood treatment device according to claim 14 or the preamble of each of the preceding claims. [Background technology]

[0002] Hose pumps or peristaltic pumps for conveying fluids guided in a hose are known from medical technology practice. Hose pumps are a special form of positive displacement pumps whose working space consists of the lumen of a flexible hose. The working space is changed by externally induced mechanical deformation using an obstruction device (for example in the form of an obstruction roller or surface). To generate a volume flow, the hose is obstructed at one or more points (obstruction areas), which are moved forward along the hose towards the pump outlet. The suction of new fluid at the pump inlet is achieved, inter alia, by negative pressure, which results from the reshaping of the no longer obstructed hose areas by the hose's elasticity. Summary of the Invention

[0003] The object of the present invention is to propose a further delivery device.In addition, a blood treatment apparatus shall be specified.

[0004] The object according to the invention is achieved by a delivery device having the features of claim 1. The object is further achieved by a blood treatment apparatus having the features of claim 14.

[0005] The transport device according to the invention is useful for transporting a medical fluid guided in a hose, which may be or include whole blood, plasma or other blood components, medicines, substitutes, dialysis fluids, parenteral foods, or other medical fluids.

[0006] The transport device according to the present invention comprises a rotor with an occlusion device and a stator. The stator may be, for example, a pump housing or a part thereof. The stator forms or comprises a container for the rotor and the hose. The stator thus comprises at least one stator base, a hose seat, and a space for receiving the hose, the hose seat being or comprising a counter-bearing for the occlusion device of the rotor. The stator may be, for example, accessible or open in the direction of the rotor's rotation axis, or may comprise a closable and / or removable cover element that, among other things, protects the rotor and the hose from accidental contact. The stator further comprises inlet and outlet regions for the hose, which may be designed, for example, as a pump inlet and a pump outlet. The transport device aspirates medical fluids from the inlet region and transports them further to the outlet region.

[0007] The rotor comprises at least one rotor shaft (which may for example be designed as the geometric axis of the hub bore, or alternatively here be a rotor shaft instead of a shaft), which is particularly arranged centrally (for example relative to the rotor) and comprises at least two occlusion devices, for example in the form of rollers. The occlusion devices, mounted radially relative to the rotor shaft, serve to intermittently press the hose against the opposing bearing of the stator when the delivery device is in use, pushing or delivering the fluid in the hose lumen towards the pump outlet. This creates a negative pressure in the hose upstream of the occlusion area, which sucks in further fluid to be delivered.

[0008] The hose can be alternately compressed and decompressed again. The rotor is not equipped with occlusion devices around its entire circumference; instead, the occlusion devices are arranged with gaps that allow for intermittent occlusion of the hose while the rotor is rotating. There can be various numbers of such occlusion devices. For example, the occlusion devices can be offset from one another by 180° for a rotor with two occlusion devices, 120° for a rotor with three occlusion devices, 90° for a rotor with four occlusion devices, etc. The distance between the occlusion devices is the same in some embodiments and not the same in other embodiments.

[0009] According to the invention, the rotor also comprises at least one guide element, herein referred to as an axial guide element for the hose, arranged to be rotatable about its longitudinal axis. The guide element serves to align and / or center the hose within the hose seat of the stator. The longitudinal axis of the axial guide element preferably extends parallel to the longitudinal axis of the rotor shaft.

[0010] The axial guide element, which according to the invention can rotate around its longitudinal axis, is preferably used to reduce the friction forces acting on the hose and generated by the rotational movement of the rotor.

[0011] The rotational movement of the axial guide element may be passive, i.e. without its own drive, i.e. solely due to frictional forces against the hose.

[0012] In certain embodiments, the number of axial guide elements may be equal to the number of occlusion devices that the rotor comprises, so that when the rotor is moving, an axial guide element can travel in front of each occlusion device.

[0013] In further embodiments, the number of occlusion devices does not correspond to the number of axial guide elements, for example, two or more axial guide elements may be provided in front of each occlusion device.

[0014] For this purpose, the axial guide element comprises at least one intermediate (alternatively, central) section, which may be rotatably arranged or mounted. The axial guide element also comprises at least one first lateral section, which radially protrudes beyond the intermediate section and is rotatably arranged. The first lateral section may radially protrude beyond a portion of the outer edge of the rotor.

[0015] The lateral and intermediate sections of the axial guide element receive the hose by bounding it from below and on the radially inner side of the hose (in a side view of the rotor with the rotation axis upright).

[0016] The lateral and mid-sections may be one-piece components in some embodiments, or they may alternatively be composite members or assembled into units.

[0017] The blood treatment apparatus according to the invention comprises a transport device according to the invention, which may be part of the blood treatment apparatus or may be designed as a cassette or module that is or will be attached to the blood treatment apparatus, for example to or in a container of the blood treatment apparatus, to which gears to which the rotor of the transport device is or may be connected are provided for this purpose.

[0018] In all of the following descriptions, the use of expressions such as "may be" or "can have" shall be understood as synonymous with "preferably is" or "preferably has", respectively, and are intended to describe embodiments according to the present invention.

[0019] An embodiment according to the invention may comprise one or several of the features mentioned above or below, wherein the features mentioned herein may be the subject of an embodiment according to the invention in any combination, unless a person skilled in the art recognizes that a particular combination is technically impossible.

[0020] Embodiments according to the invention are further subject matter of the dependent claims and embodiments.

[0021] Whenever numerical terms are referred to herein, those skilled in the art should recognize or understand these as indications of lower numerical limits. Unless this clearly contradicts the skilled artisan, they should interpret a specification of, for example, "1" as encompassing "at least one." This understanding is also encompassed by the present invention as an interpretation that a numerical term, for example, "one," can alternatively mean "exactly one" whenever this is clearly technically possible to those skilled in the art. Both are encompassed by the present invention and apply to all numerical terms used herein.

[0022] Whenever an embodiment is referred to herein, this is an exemplary embodiment according to the present invention.

[0023] "Top" and "bottom" information is to be understood herein as absolute or relative spatial information in case of doubt to one skilled in the art, and refers to the orientation of the respective elements within the figures or their orientation when used as intended.

[0024] When a hole is referred to herein, this may alternatively be an opening or a through opening.

[0025] In some embodiments, the delivery device according to the invention comprises at least one further axial guide element, in some embodiments at least one of the axial guide elements or at least one of the occlusion devices is arranged on an optional swing arm of the rotor.

[0026] In some embodiments, the swing arm is designed as a suspension, for example a fork, with a swing joint that connects the suspension or fork to another section of the rotor, for example the hub body.

[0027] A connecting element may be provided through which the occlusion device is fastened to the suspension, and the occlusion device may be arranged to rotate freely about the connecting element, which may form an axis of rotation for the occlusion device.

[0028] The optional hub body connects the swing arm, and thus all members arranged thereon, to the axis of the rotor, and in some embodiments the hub body thus connects, for example, all components of the rotor extending radially within or from the rotor, in particular the occlusion device and the axial guide element, to the rotation of the rotor.

[0029] In certain embodiments, the optional hub body is designed as a connecting plate, i.e., a plate with necessary holes, pins, or other connecting structures, to connect the rotor shaft to the occlusion device so that the movement of the rotor shaft is transmitted to the occlusion device.

[0030] In some embodiments, the swing arms are designed as arms, which can therefore form a rigid structure.

[0031] In some embodiments, at least one swing arm is spring-loaded. A low spring response of the swing arm can be advantageous, for example, to facilitate hose insertion into the rotor or to easily adapt the rotor to various hoses.

[0032] In some embodiments, at least two axial guide elements and / or at least two occlusion devices are arranged opposite each other on a common swing arm of the rotor.

[0033] In this, the rotor can comprise one swing arm for the occlusion device and one further swing arm for the axial guide element.

[0034] Both the occlusion devices and the axial guide elements can be present in different numbers, and in their radial arrangement they can be arranged always at the same distance or at different distances from each other on their respective swing arms.

[0035] In some embodiments, the occlusion devices and the axial guide elements of the rotor are arranged on a common swing arm, where an axial guide element is optionally assigned to each occlusion device.

[0036] According to the invention, the occlusion devices and axial guide elements can be present in different numbers and can be arranged on the swing arm at the same or different distances from each other.

[0037] In a further embodiment, the number of occlusion devices and axial guide elements are not the same, for example, two or more axial guide elements may be positioned in front of each occlusion device in the rotor.

[0038] The swing arm can have any design known in the art.

[0039] In some embodiments, at least one of the axial guide elements can include at least one second transverse section, which can be conical. This geometric design of the axial guide element helps to better guide the hose over the stator base and around the rotor to minimize transverse sliding of the hose when the rotor is moving, thus reducing hose wear.

[0040] In a further embodiment, the axial guide element comprises an intermediate section that is slightly hourglass shaped.

[0041] In some embodiments, the first and / or second transverse sections of the axial guide element may be conical, and together they may form a double cone, with the tips of the cones facing each other, and an intermediate section of the axial guide element disposed between and connecting the first and second transverse sections.

[0042] The double-cone shaped axial guide element guides the hose around the rotor due to its geometric design. Further guide elements serving the same purpose can advantageously be omitted in such an embodiment according to the invention.

[0043] In some embodiments, the two conical lateral sections are different or distinct from each other, which means that the double cone formed by the two conical lateral sections is preferably not point-symmetric with respect to its geometric center of gravity.

[0044] In a particular embodiment, the rotor comprises, in addition to the intermediate section, an axial guide element which does not comprise two lateral sections, but rather exactly one lateral section.

[0045] In some embodiments, the rotor may further comprise at least one lateral guide element.

[0046] The longitudinal axis of the lateral guide element advantageously extends perpendicular to the rotor axis and is arranged above the stator base of the stator so that the hose is arranged between the stator base and the lateral guide element, which only limits the hose to the outside, i.e., to the user, which advantageously contributes to preventing the hose from sliding out of the stator base when the rotor is rotating.

[0047] In such an embodiment, in addition to the intermediate section, the axial guide element may include exactly one lateral section toward the stator base, which prevents contact between the hose and the stator base. The intermediate section of the axial guide element supports and guides the hose from below (i.e., the intermediate section supports the surface of the hose located closest to the rotor axis). The lateral guide element further prevents contact with the rotor hub body and prevents the hose from moving out of the blocking roller. In such an embodiment, the hose is thus preferably supported and guided outward, i.e., toward the user, by only one or more such lateral guide elements.

[0048] In some embodiments, the lateral guide element may be rotatable about its central axis, which may help to reduce or minimize mechanical stress for or on the inserted hose when the rotor is moving.

[0049] In some embodiments, optionally, only the middle section of the axial guide element is rotatable about its central longitudinal axis, which can also help reduce mechanical stress on the hose.

[0050] In some embodiments, the transport device according to the invention is equipped with a cover element, which can cover or at least partially cover the rotor and / or the hose as long as it is inserted into the transport device.

[0051] In some embodiments, the cover element is arranged to be stationary and / or non-rotating relative to the stator when the delivery device is delivering.

[0052] In a further embodiment, the cover element is coupled to the rotor and is affixed to the rotor as it rotates.

[0053] The cover element may be suitable for protecting the rotor or the entire transport device from dirt or moisture.

[0054] Furthermore, for example, when the rotor is rotating, a user may be prevented from accidentally reaching between at least one rotating component.

[0055] In some embodiments, the cover element optionally comprises or consists of at least one guiding lug, which, due to its geometric shape, can be used for easy and safe insertion of the hose into the stator base.

[0056] The guide lug can be designed, for example, as a descending portion of a portion of the cover element towards the stator base.When inserting the hose, the guide lug can be a support receptacle for the portion of the hose that is inserted around the rotor.

[0057] When inserting the hose into the delivery device, the hose is placed in contact with the guide lugs. The hose is then advanced toward the stator base. The hose can be slid into a desired position relative to the rotor by, for example, a rounded, smooth, and / or angled surface of the guide lugs toward the stator base, and then further advanced around the rotor.

[0058] The geometry of the guide lugs preferably facilitates insertion of the hose and prevents the hose from twisting and / or slipping out of the space between the rotor and stator during insertion.

[0059] In other embodiments, the guide lugs are integrated into the cover element and / or form a one-piece unit with the cover element.

[0060] In some embodiments, the guide lug and the cover element form a composite unit.

[0061] In some embodiments, the guide lug may be understood as an insertion or screwing aid.

[0062] In some embodiments, optionally at least one axial guide element and / or one lateral guide element is integrated in the cover element.

[0063] In such an embodiment, swing arms or similar connecting elements between the rotor and / or axial and / or lateral guide elements are no longer necessary, since the tasks of these connecting elements are taken over by the cover elements.

[0064] In some embodiments, the cover element is designed as a hub body. The cover element can be provided with connecting elements for connection with a gear of the conveying device. The cover element can also act as a swing arm, for example the cover element can be provided with a pin that can serve as a shaft for a rotating component of the conveying device. It is therefore advantageous to be able to build the conveying device without a swing arm, a hub or a similar connecting element, since the connecting and coupling functions usually performed by a swing arm are now taken over by the cover element.

[0065] In some embodiments, the delivery device is a cassette or part of a cassette that is adapted to be attached to a fluid treatment apparatus.

[0066] In some embodiments, the delivery device is rigidly connected to a further section of the fluid treatment apparatus, such as a housing.

[0067] In some embodiments, the fluid treatment device is a blood treatment device.

[0068] In some embodiments, the blood treatment device is designed as a dialysis device, a hemodialysis device, a hemofiltration device, a hemodiafiltration device, an apheresis device, a plasma treatment or plasma exchange device, a TPE device (total parenteral nutrition), and / or a combination thereof.

[0069] In some embodiments, the distance between the occlusion device and the hose seat, which is the counter-bearing for the occlusion device, cannot be varied.

[0070] In some embodiments, the hose seat does not have a conical or tapered footprint that supports on or at the housing against a complementary shaped support surface.

[0071] In some embodiments, the distance between the occlusion device and the hose seat cannot be adjusted by moving the hose seat relative to the housing along the support surface.

[0072] Some or all of the embodiments may provide one, several, or all of the advantages mentioned below.

[0073] As a hose pump, the delivery device according to the invention makes it possible to deliver fluid gently and without contact with components of the device other than the inside of the hose.

[0074] The construction of the conveying device according to the invention can also protect the hose from serious, heavy or further damage by keeping low the shear forces caused by the displacement of the blocked section of the hose along its longitudinal axis, which is a factor that not only reduces the life of the hose but also reduces conveying speed and pressure as the hose wears.

[0075] Damage to the hose that can also be advantageously reduced according to the invention is the so-called fragmentation of hose material particles. Such blown or shredded hose particles can contaminate the fluid being pumped. In the medical field, this can lead to accumulations in organs, for example.

[0076] The conveying device according to the invention advantageously reduces or even prevents transverse movement of the hose within the stator (i.e., in a direction parallel to the axis of rotation of the rotating rotor). This indirectly reduces or mitigates wear on the hose due to sliding friction, thus increasing the lifespan of the hose and reducing the phenomenon of crushing. This applies in particular to blocked hose sections on the suction side.

[0077] Furthermore, when using the conveying device according to the invention, such a preferred structure thereof can be advantageous not only to significantly increase the lifespan of the hose, but also to make it possible to maintain a more constant flow rate value.

[0078] In the following, the invention will be described by way of example only with reference to the accompanying figures in which like reference numerals indicate the same or identical components. [Brief explanation of the drawings]

[0079] [Figure 1] 1 is a schematic diagram of a conventional transport device. [Figure 2a] 1 is a schematic front view of a first embodiment of a delivery device according to the present invention; [Figure 2b] 2b is a schematic diagram of the delivery device of FIG. 2a with a hose inserted; [Figure 3] 2b is a schematic view of the delivery device according to the invention of FIG. 2a, viewed from below of the occlusion device and the axial guide element; [Figure 4] Schematic diagram of the rotor of FIG. 2a in the view according to FIG. 3 during insertion of the hose using the guide lugs. [Figure 5] Schematic diagram of the rotor of the previous illustration of the diagram in Figure 4 with the hose inserted. [Figure 6] FIG. 2 is a simplified schematic cross-sectional view of the rotor of the previous figure with a hose inserted; [Figure 7] 10 is a perspective view of the rotor of the previous figure, obliquely from below and from the front on the hose guiding area. [Figure 8]A further embodiment of the transport device according to the invention, in a perspective view of the rotor oblique from the outside, from the perspective of the obstruction device, the axial guide element in an embodiment with only one lateral section, as well as one lateral guide element. [Figure 9] FIG. 9 is a front view of the rotor of FIG. 8 . [Figure 10] 4 shows a part of a further embodiment of a transport device according to the invention in view of a slightly perspective view of the rotor from below; FIG. [Figure 11] Schematic front view of a further embodiment of a transport device according to the invention without cover elements, from the perspective of the swing arm; [Figure 12] 5 is a schematic front view of a further embodiment of a conveying device according to the invention without a cover element, viewed from the perspective of the common axis of the swing arm and the axial guide element; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0080] Figure 1 shows a schematic diagram of a conventional conveying device in the form of a pump unit having a stator 20 and a rotor 10. A hose 30 is arranged in the space between the rotor 10 and the stator 20 above the stator base 21. The rotor 10 in Figure 1 does not have the axial guide element provided by the present invention.

[0081] With the rotor 10 in motion, a transverse movement (see double arrow QQ) occurs in the hose 30 relative to the blocking roller 1 or guide element 6. The frictional forces that arise during the rotation of the rotor act on the hose 30 in such a way that the hose is stretched like a string between the hose inlet and the blocking roller 1 (see the hose path from point P1 to point P2).

[0082] In particular, in the embodiment of the delivery device in which the hose 30 does not simply extend tangentially at the inlet and outlet of the pump housing (30a and 30b, respectively), but is slightly twisted, such transverse movements occur under the mentioned tensile force. The hose 30 is here periodically pulled with each full rotation of the rotor 10, and this tensile force is reduced again by further rotation of the occlusion device 1 towards the overpressure side. Transverse movements are less likely to occur on the overpressure side, because here the hose 30 is compressed and only lies against the hose seat.

[0083] In this string-like stretched hose section, the angle between the axis of the guiding surfaces and the hose axis is less than 90°, which, in addition to causing the hose to unwind, also causes the hose to slide on the rolls, an effect which, in addition to the transverse movement described, promotes wear on the hose 30.

[0084] 2a and 2b both show a schematic view of an embodiment of a conveying device 100 according to the invention seen from the front or outside (as perceived in use by a user), with a rotor 10 rotating around a rotor shaft 7 and a fixed stator 20 inside which the rotor 10 can rotate. The stator 20 forms a container for the rotor 10 and a hose 30 (see FIG. 2), the hose being inserted into the rotor 10 from below and exiting from here again in a downward direction.

[0085] The container for the rotor 10, which is located behind the rotor 10 in Figures 2a and 2b, is designed as part of the housing of the fluid treatment device (not shown) or as a cassette that is mounted or plugged onto the rotor gear of the fluid treatment device, not shown.

[0086] The rotor 10 may be connected via a shaft to a drive motor of a fluid treatment device (not shown) and may be actuated by said drive motor.

[0087] In certain embodiments, the container for the rotor 10 can have or be a drive shaft, into which the rotor 10 is inserted.

[0088] The receiving section of the stator 20 or the space for the hose 30 is formed by a stator base 21, from which a hose seat 22 extends as a counter-bearing for the obstruction device 1. The hose 30 is inserted into the conveying device 100 so that it is located between the rotor 10 and the hose seat 22 as a counter-bearing and is guided at least partially around the rotor 10, as shown in Figure 2b.

[0089] The rotor 10 is designed, for example, as a substantially cylindrical closure roller and preferably comprises one or more closure devices 1 that can rotate around its central axis of rotation O (see FIG. 3). FIG. 2a exemplarily shows two closure devices 1 located opposite each other and attached to a swing arm 2. The swing arm 2 connects the rotor shaft 7 to the closure devices 1 and functionally couples the closure devices to the rotational movement of the rotor 10. In this way, when the conveying device 100 is in use, the hose 30 is periodically pressed by the one or more closure devices 1 against the hose seat 22 as a counter-bearing of the stator 20 and is thus occluded.

[0090] As the rotor 10 rotates, the occlusion device 1 slides or rolls along the hose 30 (not shown in FIG. 2a). After the occlusion device 1 disengages from the hose 30, the previously compressed section of the hose re-expands due to the elasticity of the hose material. The negative pressure created sucks fluid present in the hose system upstream of the delivery device 100. The negative pressure is enclosed in front of the occlusion device 1 and is created by the way the existing volumetric flow is conveyed. This also causes the fluid to be conveyed along the lumen of the hose 30.

[0091] In this, the occlusion device 1 can compress the hose 30 more or less. This degree of compression of the hose 30 can optionally be set by the invention. For example, it can be fixed by an optional, preferably spring-suspended swing arm 2.

[0092] Such an optional swing arm 2 allows the conveying device 100 to be adapted to the properties of the hose 30 actually used, for example its material properties or its cross section.

[0093] Furthermore, the conveying device 100 of Figures 2a and 2b further comprises at least one axial guide element 6 (see Figure 3), here exemplarily two axial guide elements 6, in each case a first transverse section can be seen, see Figure 3.

[0094] The axial guide element 6 favours embedding of the hose 30 by supporting and bounding the hose laterally (see FIG. 3), for example from below as shown in more detail in FIG.

[0095] The rotor 10 of Figures 2a and 2b is optionally located under a cover element 5 that can protect the user from accidentally touching the rotor components. The cover element also optionally serves as a handle for manual threading of the hose 30.

[0096] The cover element 5 optionally comprises or consists of two guide lugs 4. The guide lugs 4 may be designed to facilitate the screwing in of the hose 30 by their geometric shape (see FIG. 3).

[0097] The arrow indicated by reference number A indicates the direction of view according to FIGS.

[0098] Figure 3 shows a schematic view of only the rotor 10 of Figures 2a and 2b, viewed from below in the direction of arrow A in Figure 2a.

[0099] The occlusion device 1 and the axial guide element 6 are clearly visible here, since the hose 30 has not yet been inserted.

[0100] The axial guide elements 6 can have various geometric configurations. They can be made of one or more members. The axial guide elements include at least one intermediate section 6c and at least one first transverse section 6a that protrudes radially beyond the intermediate section 6c. This first transverse section 6a also protrudes radially beyond a portion of the outer edge of the rotor 10. The axial guide elements 6 are provided to center or align the hose 30. They are configured to prevent or minimize transverse sliding or shearing movement of the hose 30 while the rotor 10 is moving. To further minimize frictional forces on the hose 30, the axial guide elements 6 in this embodiment can consist of or include passively rotating members or rollers.

[0101] Only the first transverse section 6a of the axial guide element 6 connected to the intermediate section 6c is shown here, see Figure 3. An optional second transverse section 6b may also be provided, see for example Figure 3. The second transverse section may be connected to the first transverse section 6a by the intermediate section 6c.

[0102] According to the invention, for example, the intermediate section 6c and / or the first transverse section 6a and / or the second transverse section 6b may each be rotatable about its longitudinal axis (or about a centre point in the case of an embodiment having a disc-shaped first transverse section 6a).

[0103] Both the occlusion device 1 and the axial guide element 6 are here exemplarily arranged on a common swing arm 2 .

[0104] The occlusion device 1 is optionally cylindrically designed.

[0105] The axial guide element 6 in this embodiment is one piece and has a cylindrical intermediate section 6c, a substantially disc-shaped first transverse section 6a and a substantially conical second transverse section 6b.

[0106] Here, the intermediate section 6c also has, by way of example, a smaller maximum diameter than the lateral sections 6a and 6b. In use, the axial guide element 6 of Figure 3 rotates about its central longitudinal axis L.

[0107] In some embodiments, the axial guide element 6 rotates passively, i.e., its axis or shaft is not mechanically connected to the rotor axis. The rotational movement of the axial guide element 6 about its longitudinal axis is determined solely by friction against the hose 30, without any additional forces responsible for this rotational movement of the axial guide element 6.

[0108] Each of the axial guide elements 6 may be individually attached to a specific swing arm 2. Alternatively, the axial guide elements 6 may be attached in pairs or groups to a respective common swing arm 2. Alternatively or additionally, at least one of the axial guide elements 6 may be arranged on a common swing arm 2 with at least one of the occlusion devices 1 (see, for example, an exemplary embodiment according to the present invention in FIG. 12).

[0109] FIG. 4 shows a schematic view of the rotor 10 during the insertion of the hose 30 into the conveying device 100 using the guide lugs 4 .

[0110] Therein, the guide lugs 4 (guiding elements in general) are designed to use the axial guide elements 6 to insert the hose 30 between the rotor 10 and the stator 20 easily and with only a small mechanical load.

[0111] FIG. 5 shows a schematic view of the rotor 10 of FIG. 4 with the hose 30 already inserted.

[0112] The geometric design of the guide element 6, here exemplarily, is such that the hose 30 does not come into contact with the guide lug 4 when the rotor 10 is moving. This is indicated in FIG. 5 by the thin arrow.

[0113] FIG. 5 shows how the hose 30 is guided on and in contact with the intermediate section 6c and at the same time is laterally restricted by the first lateral section 6a and the second lateral section 6b of the axial guiding element 6.

[0114] The geometry of the axial guide element 6 keeps the hose 30 centered around the rotor 10 within the stator base 21 so that the hose 30 does not come into contact with the stator base 21, the guide lugs 4 and / or the cover element 5 when the rotor 10 is in motion.

[0115] In this way, the hose 30 inserted between the occlusion device 1 and the stator 20 advantageously has little lateral or axial play, i.e. the hose 30 is less exposed to the transverse and shear movements associated with the rotor moving. Reducing hose wear allows for material savings.

[0116] FIG. 6 shows a greatly simplified cross-sectional view of a portion of the stator 20 , in particular a portion of the hose 30 inserted between the stator 20 and the rotor 10 and the axial guide element 6 .

[0117] The service life of the hose 30 can be significantly increased by appropriate selection of the construction parameters of the axial guide element 6. Also, in some embodiments, a more constant flow value can be maintained along the hose 30.

[0118] FIG. 7 shows a schematic perspective view of the rotor 10 of the previous figures, looking obliquely downward and from the front (outside) at the area in which the hose 30 can be guided around the rotor 10.

[0119] Here, the rotor 10 is provided with an optional cover element 5 that substantially covers the rotor 10. In the radial direction, only the swing arm 2, with the closure device 1 and the axial guide element 6, protrudes beyond the cover element 5 of the rotor 10. The axis 2c of the closure device 1 is clearly visible, which is designed as a swing axis with which the closure device is mounted in or to the swing arm 2. This axis 2c allows the rotation of the closure device 1 about its central longitudinal axis O.

[0120] In this embodiment, the two transverse sections 6a and 6b of the axial guide element 6 are designed, for example, in the form of disks. They optionally have the same diameter. The middle section 6c is cylindrical and has a diameter significantly smaller than the two transverse sections 6a, 6b. Both transverse sections 6a, 6b may optionally be conical, the respective conical heights of the transverse sections 6a, 6b being the same in some embodiments and different in other embodiments.

[0121] 8 shows a view of a further embodiment of the delivery device in a perspective view of the rotor 10, seen obliquely from below and from the front. The occlusion device 1, the axial guide element 6 and the lateral guide element 3 can be easily recognized.

[0122] In some embodiments, for example that of FIG. 8, the axial guide element 6 comprises only the first transverse section 6a and the intermediate section 6c, and in particular does not comprise the second transverse section 6b.

[0123] The first transverse section 6a bounds the hose 30 towards the stator base 21. The first transverse section has, for example, a (preferably completely or substantially) disk-shaped or conical geometric design that is suitable for keeping the hose 30 centered while the rotor 10 is in motion, and avoiding unintentional contact with the stator base 21 or with members or areas of the rotor body (e.g. with the hub body 8).

[0124] Furthermore, the rotor 10 in this embodiment comprises at least one lateral guide element 3 (see also Figure 9). The lateral guide elements 3, only one of which is visible in Figure 8, delimit the hoses 30 laterally towards the outside of the rotor 10, i.e. towards the open side of the space between the rotor 10 and the stator 20, i.e. away from the stator base 21 or towards the user. They therefore prevent the hoses 30 from sliding out of the conveying device 100 while the rotor 10 is moving. The lateral guide elements 3, in interaction with the axial guide elements 6, prevent transverse sliding or shearing movements of the hoses 30 from occurring.

[0125] At least one lateral guide element 3 may be designed as a cylindrical or substantially cylindrical body or may have one arranged on an axis passing through one of its base surfaces, which shaft extends radially to the rotor shaft 7. The longitudinal axis of the lateral guide element 3 is preferably perpendicular to the longitudinal axis of the rotor shaft 7. The lateral guide element 3 can optionally rotate about its longitudinal axis P in order to reduce the frictional forces on the hose 30 when the rotor is moving.

[0126] FIG. 9 shows a front view of the rotor 10 of FIG.

[0127] FIG. 10 shows a portion of a further embodiment of a transport device 100 in a slightly perspective view of the rotor 10 from below.

[0128] Here, the cover element 5 forms a housing which covers the rotor 10 outwardly towards the user and has an upper surface or surface 5a with guide lugs 4 and, optionally, a shell or boundary portion 5b extending up to or near the stator base 21 and having a recess through which the occlusion device 1, the axis of the at least one lateral guide element 3 and / or the lateral section of the at least one axial guide element 6 or parts thereof can protrude beyond the rotor 10.

[0129] For example, in this embodiment, the intermediate section 6c of the axial guide element 6 is integrated in the housing, while the first transverse section 6a of the axial guide element 6, which is designed in the form of a disk, is exemplarily configured here as a rotating member and can clearly project laterally beyond the cover element 5.

[0130] FIG. 11 shows a schematic view of a further embodiment of a transport device 100 in a slightly perspective view from the front, looking at the swing arm 2.

[0131] The swing arm 2 can have any design known in the art. For example, the swing arm can be designed as a fork with a swing joint 2a connecting the fork to the hub body 8. Furthermore, the swing arm can be designed with a swing spring 2b and an axle 2c for freely rotatingly mounting the occlusion device 1 on the fork of the swing arm 2.

[0132] The hub body 8 connects the swing arm 2, and therefore all members arranged thereon, to the rotor 10, which is driven by the shaft of a drive motor of a blood treatment device (not shown). In these embodiments, the hub body 8 connects, for example, all components of the rotor 10 extending radially therein, in particular the occlusion device 1 and the axial guide element 6, to the rotation of the rotor by means of the axis 2d.

[0133] In the embodiment shown in FIG. 11, the axial guide element 6 is not arranged on one of the swing arms 2 .

[0134] The swing arm 2 may be a rigid structure or may be slightly springy (as shown in Figures 11 and 12). A slightly springy swing arm may be advantageous, for example, to allow the rotor 10 to accommodate different hoses, for example hoses having different diameters.

[0135] In principle, different designs of the swing arm 2 in a single embodiment of the rotor 10 are also encompassed by the invention.

[0136] FIG. 12 shows a schematic view of a further embodiment of a transport device 100 according to the invention, seen from the front, with a swing arm 2 and without a cover element.

[0137] The structure of this embodiment also largely corresponds to the design of the embodiment of Fig. 11. However, here at least the occlusion device 1 is connected to the axial guide element 6 by means of a swing arm 2, the swing joint 2a serving as an axis for the axial guide element 6. The at least one occlusion device 1 and the at least one axial guide element 6 are therefore present on a common swing arm 2.

[0138] The occlusion device 1 may also be spring-loaded by a swing spring 2b, which may facilitate insertion of the hose 30 into the rotor 10 and / or facilitate adaptation of the rotor 10 to various hoses, as described herein.

[0139] The statements given above with respect to FIG. 11, and in particular with respect to the hub body 8, also apply equally to the embodiment or view of FIG. The inventions described in the claims of the original application are set forth below. [1] A transport device for transporting a medical fluid guided in a hose, the transport device having a rotor and a stator, the stator having at least one stator base, an area for receiving the hose in the transport device, and a hose seat as a counter-bearing for an occlusion device, the rotor having at least one rotor shaft and at least two occlusion devices radially attached to the rotor shaft and intermittently compressing the hose against the hose seat during use of the transport device, the rotor including at least one axial guide element arranged to rotate about its own longitudinal axis to align or center the hose within the stator, the longitudinal axis of the axial guide element extending parallel to the longitudinal axis of the rotor shaft, the axial guide element having: at least one intermediate section and at least one first lateral section projecting radially beyond the intermediate section, wherein at least the first lateral section is rotatably arranged; A transport device, wherein a portion of the first lateral section projects radially beyond a portion of an outer edge of the rotor. [2] A conveying device according to [1], having at least one further axial guide element, wherein at least one of the axial guide elements or at least one of the occlusion devices is arranged on a swing arm of the rotor. [3] A conveying device according to [1] or [2], wherein at least two axial guide elements and / or at least two occlusion devices are arranged opposite each other on a common swing arm of the rotor. [4] A conveying device described in any one of [1] to [3], wherein a plurality of occlusion devices and a plurality of axial guide elements of the rotor are arranged on a swing arm so that the axial guide elements and the occlusion devices are arranged alternately within the rotor. [5] A conveying device according to any one of [1] to [4], wherein at least one of the axial guide elements comprises at least one conical second transverse section. [6] A conveying device as described in any one of [1] to [5], wherein the first and second transverse sections of the axial guide element are conical and together form a double cone, and the intermediate section of the axial guide element is positioned between the first and second transverse sections and connects the transverse sections to each other. [7] The transport device of [6], wherein the first and second transverse sections of the cone are different, and therefore the double cone is not point-symmetric about its geometric center of gravity. [8] A conveying device as described in any one of [1] to [7], wherein the rotor further comprises at least one lateral guide element, the longitudinal axis of which extends perpendicular to the rotor axis, and the at least one lateral guide element is arranged opposite the stator base and restricts the hose only toward the front or outward. [9] The conveying device according to [8], wherein the lateral guide element is rotatably arranged about its central longitudinal axis.

[10] A conveying device according to any one of [1] to [9], wherein only the intermediate section of the axial guide element is rotatable about its central longitudinal axis.

[11] A transport device according to any one of [1] to

[10] , comprising a cover element that covers or at least partially covers the rotor.

[12] A conveying device according to any one of [1] to

[11] , wherein the cover element comprises or consists of at least one guide lug for easy and safe insertion of the hose into the region between the rotor and the stator.

[13] The conveying device according to any one of [1] to

[12] , wherein at least one axial guide element and / or one lateral guide element is integrated into the cover element.

[14] A blood treatment apparatus having a delivery device according to any one of [1] to

[13] .

[15] The blood treatment device according to

[14] , which is designed as a dialysis device, a hemodialysis device, a hemofiltration device, a hemodiafiltration device, an apheresis device, a plasma treatment or plasma exchange device, a TPE device, and / or a combination thereof. [Explanation of symbols]

[0140] 1. Occlusion Device 2 swingarm 2a Swing type joint 2b Swing spring 2c Axis of the occlusion device 2d guide element axis 3 Lateral Guidance Elements 4 guide lugs 5a Surface, top surface 5b Boundary, shell 5 Cover Elements 6 Axial guide elements 6a: first transverse section of the axial guide element towards the machine side 6b: a second transverse section of the axial guide element towards the user 6c Mid-section of axial guide element 7 Drive shaft, or rotor shaft or axis 8 Hub body 10 rotors 20 Stator 21 Stator base 22 Hose seat as counter bearing for occlusion device 30 hose 100 Transport Device L central longitudinal axis of the axial guide element Q central transverse axis of the axial guide element O Central longitudinal axis of the occlusion device P central longitudinal axis of the lateral guide element

Claims

1. 1. A transport device for transporting a medical fluid guided in a hose, the transport device comprising a rotor and a stator, the stator comprising at least one stator base, an area for receiving the hose in the transport device and a hose seat as a counter-bearing for an occlusion device, the rotor comprising at least one rotor shaft and at least two occlusion devices radially attached to the rotor shaft and for intermittently compressing the hose against the hose seat during use of the transport device, the rotor comprising at least one axial guide element arranged to rotate about its own longitudinal axis in order to align or center the hose within the stator, the longitudinal axis of the axial guide element extending parallel to the longitudinal axis of the rotor shaft, the axial guide element comprising: at least one intermediate section and at least one first lateral section projecting radially beyond the intermediate section, wherein at least the first lateral section is rotatably arranged; a portion of the first transverse section protruding radially beyond a portion of an outer edge of the rotor; the conveying device has at least one further axial guide element, and at least one of the axial guide elements and at least one of the closure devices are arranged on a common swing arm of the rotor; The swing joint of the common swing arm is used as an axis for the axial guide element; Transport device.

2. 2. The conveying device according to claim 1, wherein at least two axial guide elements and / or at least two occlusion devices are arranged opposite each other on the common swing arm of the rotor.

3. 3. The transport device according to claim 1 or 2, wherein a plurality of closure devices and a plurality of axial guide elements of the rotor are arranged on a swing arm such that the axial guide elements and the closure devices are arranged alternately within the rotor.

4. 4. A conveying device according to any one of claims 1 to 3, wherein at least one of the axial guide elements comprises at least one conical second transverse section.

5. 5. The conveying device of claim 4, wherein the first and second transverse sections of the axial guide element are conical and together form a double cone, the intermediate section of the axial guide element is disposed between the first and second transverse sections, and the transverse sections connect tips of the first and second transverse sections to one another.

6. 6. The transport device of claim 5, wherein the first and second transverse sections of the cone are different, such that the double cone is not point-symmetric about its geometric center of gravity.

7. 7. The conveying device according to claim 1, wherein the rotor further comprises at least one lateral guide element, the longitudinal axis of which extends perpendicular to the rotor axis, the at least one lateral guide element being arranged opposite the stator base and restricting the hose only in a forward or outward direction.

8. The transport device of claim 7 , wherein the lateral guide element is rotatably arranged about its central longitudinal axis.

9. 9. A transport device according to any one of claims 1 to 8, comprising a cover element covering or at least partially covering the rotor.

10. 10. The conveying device according to claim 9, wherein the cover element comprises or consists of at least one guide lug for easy and safe insertion of the hose into the region between the rotor and the stator.

11. 11. The conveying device according to claim 9 or 10, wherein at least one axial guide element is integrated in the cover element.

12. 11. Conveying device according to claim 9 or 10 when dependent on claim 8, wherein the at least one lateral guide element is integrated in the cover element.

13. A blood treatment apparatus comprising a delivery device according to any one of claims 1 to 12.

14. 14. The blood treatment device according to claim 13, which is designed as a dialysis device, a hemodialysis device, a hemofiltration device, a hemodiafiltration device, an apheresis device, a plasma treatment or plasma exchange device, a TPE device, and / or a combination thereof.

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