Rotor for an axial pump for conveying a fluid

Abstract

Compressible rotor for an axial pump for conveying a fluid, having a rotational axis (10) and having a blade (12, 12', 12'', 12''') which has at least one partial surface which extends transversely to the rotational axis and beyond the latter, wherein the blade has webs (15, 15', 15'', 15''', 16, 16', 16'', 16''', 17) which, individually or as a network, connect one or more further webs, each forming an edge of the blade, in different edge regions of the blade, wherein the connecting webs and the further webs which form the edge of the blade are made of the same material.

Description

[0001] The invention lies in the field of mechanical engineering, in particular precision engineering, and is particularly useful in the medical field.

[0002] More specifically, the invention relates to a rotor for an axial pump.

[0003] Particularly in medical technology, small pumps, so-called micropumps, are required for a wide variety of applications. These are used for microinvasive applications, for example, to pump endogenous fluids into the body's own cavities or vessels. Typically, such micropumps are connected to catheters and inserted, for example, through the body's own vessels and delivered to the site of application. A specific example of the use of such pumps is so-called heart pumps, which are inserted into the body through a large blood vessel and can support or even replace the heart's blood flow.

[0004] In this context, rotary pumps designed as axial pumps have become particularly well known.

[0005] A special feature of some such pumps, in addition to their inherently small design, is their radial compressibility, so that such a pump can be compressed for transport through a blood vessel and expanded after being brought to the site of use, for example in a heart chamber.

[0006] Such a pump is known, for example, from US patent applications US 2009 / 0060743 A1 and US 2008 / 0114339 A1. The axial pumps described in these documents each have a shaft and rows of flexibly attached blades that pump a fluid when the shaft rotates in the axial direction. The blades can be applied radially to the shaft, thus compressing the rotor. During operation, the individual blades straighten up, partly due to the fluid back pressure, so that the pump has a considerable pumping capacity.

[0007] Against the background of the prior art, the present invention is based on the object of creating a rotor for an axial pump that is as simple in design and cost-effective to manufacture as possible. It should also be low in mass and enable sufficient pumping capacity.

[0008] The object is achieved with the features of the invention according to patent claim 1.

[0009] The rotor according to the invention has a blade with at least one partial surface which extends transversely to the axis of rotation over the latter, wherein the blade has webs which connect different edge regions of the blade to one another individually or as a network.

[0010] According to the invention, a “compressible rotor” within the meaning of the patent claims is understood to mean a rotor that is radially compressible. This preferably means that the rotor can assume a compressed state (e.g. when inserted into a human or animal body) as well as an expanded state (during pumping operation, preferably in the body, e.g. in a left ventricle of the heart). In the expanded state, the largest radial dimension of the rotor (i.e., e.g., the outer diameter of the rotor) is preferably at least 10%, particularly preferably at least 25% larger than in a compressed state (the percentages relate to the dimension in the expanded state). Preferably, the transition from the compressed to the expanded state (and back) is arbitrarily reversible, i.e., possible without damaging the rotor.

[0011] This can mean, for example, that at least one partial surface of the blade is designed such that elements of the partial surface are located opposite one another at the same axial position on different sides of the rotation axis with respect to the rotation axis. This can be realized, for example, such that the rotation axis passes through the partial surface and is radially surrounded on several sides by elements of the partial surface. This example can also be described such that a circle can be inscribed in the partial surface, through which the rotation axis passes through its center.

[0012] The blade has continuous webs or a network of webs that connect further webs, each of which at least partially forms an edge section of the blade, in various edge regions of the blade, which can also be referred to as edge sections, and thus span the blade. Such webs are suitable, in particular together with any edge strips provided on the blade, for spanning the blade and allowing the attachment of a film that forms the conveying surface of the blade and is supported by the webs. This results in a very lightweight design of the blade, which nevertheless allows the creation of a large conveying surface.

[0013] The webs and the additional webs can advantageously be manufactured in one piece from a common base body. They can each have the same or different cross-sections.

[0014] The blade is advantageously designed without a hub and is self-supporting.

[0015] This means that the torque is transmitted along the rotor via the airfoil surface, i.e., the flat, curved body that essentially forms the airfoil. Since the hub, which is usually used to transmit the torque and support the airfoil surface, has a significant volume that can be saved with the design according to the invention, a significantly greater compressibility of the rotor according to the invention is achievable.

[0016] At least one of the webs can connect two edge regions of the blade which are radially opposite to each other with respect to the axis of rotation.

[0017] However, it can also be provided that at least one web connects two edge regions of the blade which are opposite one another as seen in the longitudinal direction of the axis of rotation.

[0018] In any case, the total surface of the blade can be divided by webs according to a desired pattern to create a desired blade surface, which is formed either by the webs themselves or by a film stretched over the webs. The webs, like the conveying surface of the blade, do not have to run in a single plane, but can form a three-dimensional surface, for example, a helical spiral. The webs can run alongside one another without contact or be connected to one another at points on the blade, for example, at points subject to particular mechanical stress.

[0019] However, such nodes can also be selected in such a way that they enable or facilitate folding of the webs during a compression or expansion movement of the blade.

[0020] At least some of the nodes, in particular all of the nodes, may be spaced from the rotational axis of the blade. At least some, in particular all, of the webs may be spaced from the rotational axis over their entire length.

[0021] To make the webs compressible or expandable, they can advantageously be designed in a meandering pattern. The meandering structure is advantageously located in the surface of the blade.

[0022] To create a corresponding mechanism for compressing and expanding the blade, it can be advantageous to have the webs made of a shape memory alloy, such as Nitinol. In this case, a desired shape of the blade can be achieved by changing the temperature. The compression mechanism can also be supported by exploiting the hyperelastic properties of the Nitinol material.

[0023] If edge sections of the airfoil are designed as edge strips or edge webs, these can further stabilize the airfoil and, together with the webs, form a reliable hold or support for a corresponding airfoil foil. Such a foil can then be attached to the webs and to the edge strips or parts of the edge strips, for example, by adhesive.

[0024] The entire blade can be arranged within a hollow cylindrical component and connected to it at the edges. The hollow cylinder can be connected to one or two rotatably mounted drive pins near the axial end regions of the blade. Advantageously, the blade and the hollow cylindrical component can be radially compressed together.

[0025] The invention also relates to a rotor for an axial pump for conveying a fluid with a rotational axis and with a blade which is designed hubless as a body which is flat in terms of its contour and which is spirally twisted about an axis.

[0026] This design allows for particularly simple manufacturing and, especially since no hub is required, is particularly simple and can be compressed to a very small size. This is crucial for inserting the rotor into a human body, for example, via a bloodstream, for medical applications.

[0027] Advantageously, the blade is made as a latticework or network of webs from a flat sheet.

[0028] This allows for cost-effective series production using common sheet metal processing methods.

[0029] In particular, it can advantageously be provided that the blade is produced in particular from a Nitinol sheet, by cutting out the webs, in particular by water cutting, laser cutting or electroerosion.

[0030] The webs can be shaped in a meandering pattern in the plane of the sheet and / or perpendicular to it. This allows for slight bending during radial compression of the rotor.

[0031] Furthermore, the webs can have a different area moment of inertia in the sheet plane than perpendicular to it.

[0032] This allows for significantly lower resistance to radial compression of the blade compared to loads acting on the blade during pumping. Loads caused by fluid pressure against the blade plane are thus absorbed much more rigidly.

[0033] A particularly simple embodiment of an airfoil according to the invention provides for the airfoil to be designed as an elongated, in particular rectangular, body that is spirally twisted around an axis, in particular its longitudinal center axis. The spiral shape can also be irregular in terms of pitch or, if necessary, distorted in some other way.

[0034] When assembling the rotor, the axis of rotation of the body is preferably substantially parallel to or coincident with the axis of rotation.

[0035] This results in a symmetrical or slightly asymmetrical helical design of an airfoil, for example, by rotating the ends of a flat rectangle by 180 degrees or another angle around the longitudinal axis. The airfoil surface is then formed as a single, continuous surface that extends beyond the axis of rotation and is interspersed with it. The surface can also have recesses, for example, in the area of ​​the axis of rotation.

[0036] Such an airfoil can be designed to be self-supporting if the webs and edges are sufficiently stable, so that, for example, the torque can be transmitted via the airfoil alone, eliminating the need for a hub. The stiffness of the airfoil itself is sufficient to convey the fluid if it is driven from one of its ends. The torque is then introduced via the front edge of the airfoil.

[0037] However, it can also advantageously be provided that the blade is firmly connected to a hollow cylindrical component surrounding it. Such a hollow cylindrical component can be provided, for example, as a ring or tube section, which further stabilizes the blade and can be manufactured integrally with it. However, several coaxial and axially spaced-apart rings can also be connected to the blade on the circumference of the rotor.

[0038] These rings can then be axially spaced from each other by webs and designed to be radially compressible in order to be able to be collapsed together with the blade for the purpose of being introduced into a body.

[0039] The present invention allows for the simplest possible production of a blade for an axial pump, in which the edges and reinforcing webs of the blade can be manufactured in one piece, for example, by injection molding or machining a sheet metal part, and provided with a foil. Sections axially adjacent to the blade can also be manufactured in one piece with the blade to enable a rotatable bearing and the introduction of torque axially adjacent to the blade.

[0040] In the following, the invention is shown and subsequently explained using an exemplary embodiment in a drawing. Fig. 1 shows a cross-sectional view of a cardiac catheter with an axial pump inserted into a heart chamber, Fig. 2 a blade of an axial pump in three-dimensional view, Fig. 3 the blade from Fig. 2, where invisible contours are drawn, Fig. 4 the blade Fig. 2 with a highlighting of the visible surface by hatching, Fig. 5 a side view of the blade from Fig. 2, Fig. 6 a section of the view from Fig. 5, Fig. 7 a design of a rotor of an axial pump in three-dimensional view, Fig. 8 the view from Fig. 7 with drawn invisible contours and Fig. 9 a partially broken view of the arrangement from Fig. 7, Fig. 10 shows another rotor in which the fastening of a drive shaft is solved differently than in the embodiment according to Fig. 7, Fig. 11 a rotor with two shaft extensions attached on both sides, Fig. 12 a side view of a rotor with meandering or wavy webs that span the blade, Fig. 13 the blade from Fig. 12 in a view rotated by 90 degrees, Fig. 14 the blade from Fig. 12 in a three-dimensional view, Fig. 15 the blade from Fig. 12 in an axial plan view, Fig. 16 another variant of a blade with webs running essentially in the direction of the rotation axis in a side view, Fig. 17 the arrangement from Fig. 16 in a side view rotated by 90 degrees, Fig. 18 the arrangement Fig. 16 in a three-dimensional view, Fig. 19 the arrangement from Fig. 16 in an axial plan view, Fig. 20 shows a further embodiment of a rotor with webs extending straight across the rotation axis in a side view, Fig. 21 the arrangement from Fig. 20 in a side view rotated by 90 degrees, Fig. 22 the arrangement Fig. 20 in a three-dimensional view, Fig. 23 the arrangement from Fig. 20 in an axial plan view, Fig. 24 shows a further embodiment of a rotor with curved webs running transversely to the axis of rotation in a side view, Fig. 25 the embodiment according to Fig. 24 in a side view rotated by 90 degrees, Fig. 26 the embodiment according to Fig. 24 in a three-dimensional view and Fig. 27 a plan view of the arrangement according to Fig. 24 in axial direction.

[0041] Fig. 1 schematically shows a blood vessel 1 in a human body, which ends in a heart chamber 2 and into which a hollow catheter 3 is inserted.

[0042] A drivable shaft 4 extends through the hollow catheter 3, which can be driven at high speed by a motor 5 located outside the body. The hollow catheter 3 can be filled with a biocompatible fluid, which can serve to reduce shaft friction and dissipate heat.

[0043] At the end of the hollow catheter 3, a heart pump 6 is arranged, which draws blood through first openings 7 within the heart chamber 2 and releases it through second openings 8 within the blood vessel 1. In this way, the pump 6 supports or replaces the pumping action of the heart.

[0044] Inside the pump 6, a rotor 9 is schematically shown, which rotates around its longitudinal axis, driven by the shaft 4, and pumps blood in the axial direction from the heart chamber 2 to the blood vessel 1. Typically, such an axial pump is provided with a housing and a rotor mounted therein with pumping blades.

[0045] Such heart pumps are already known in various designs, with the radial compressibility of such pumps playing a particularly important role in their performance. The pumps should be able to be inserted through the blood vessel 1 in a compressed form and then expanded so that the impeller blades can pump the blood with the largest possible conveying surfaces and a sufficiently large flow cross-section. Various rotor designs with foldable rotors and housings are already known for this purpose. The rotor according to the invention is described in more detail with reference to the following figures.

[0046] Fig. Figure 2 initially shows an embodiment of a one-piece blade that is helically rotated around a rotational axis 10. A shaft 11 is provided that axially connects to the blade 12 but does not penetrate it. The blade 12 is thus self-supporting and transmits the torque without the need for a hub.

[0047] The blade 12 can be manufactured in one piece with the shaft extension 11 and optionally with a further shaft extension on the axially opposite side of the blade 12, for example in an injection molding process from plastic.

[0048] The Fig. Figure 2 schematically shows the external shape of the blade 12, without going into detail about the internal structure. This will be described in more detail within the scope of the invention with reference to the figures below.

[0049] Fig. 3 shows the blade from Fig. 2 from the same perspective, but with invisible lines shown dashed. Fig. Figure 4 shows a representation in which the three-dimensional shape is represented more vividly using hatching.

[0050] Fig. Figure 5 shows a side view of the blade 12 and the shaft extension 11, with a section indicated by VI, which is shown more precisely in the Fig. 6 is shown.

[0051] Fig. 7 shows another embodiment of a rotor in which the blade 12 is surrounded by a hose-like support device or sleeve, to which it is rigidly connected in this embodiment, so that the hose-like sleeve or support device 13 rotates with the blade 12. The sleeve is connected to the shaft extension 11 by means of a fork-shaped holder 14. The holder can also be designed as a spatially twisted triangular plate, which can be directly connected to the end of the blade 12. The sleeve is advantageously compressible and expandable and provides support to the blade 12. For example, the sleeve 13 can consist of a piece of plastic tubing, which can be surrounded by a wire mesh for support. The wire mesh can also consist of a shape-memory material, so that it can support the sleeve 13 through its shape changes.In particular, in the case that the blade 12 is designed without a hub and is not self-supporting, it can be connected to the inner sides of the sleeve 13 and can be clamped by its expansion movement.

[0052] Fig. 8 shows the view from Fig. 7, where invisible lines are shown in dashed lines, and Fig. 9 shows a three-dimensional representation of the blade 12, with the shape highlighted by hatching.

[0053] Fig. 10 shows, as a further variant, a blade 12' surrounded by a sleeve 13, which has a shaft extension 11' integrated into its shape, which is not connected to the sleeve 13.

[0054] Fig. 11 shows an embodiment of a sleeve 13 with two shaft extensions 11 on both sides, each of which is connected to the sleeve 13 via a fork-shaped holder 14, but not to the blade.

[0055] As in the Fig. 2 to 10, it is also evident here that the blade can have a substantially constant cross-section without any thickening; however, cross-sectional changes are by no means excluded. Accordingly, the torque is transmitted via the flat body itself, which is why no hub is required.

[0056] Fig. Figure 12 shows in more detail the structure of a typical airfoil 12, which is spanned by webs 15, 16, and 17. Also shown are edge strips 18 and 19, which can typically be made of the same material as the webs 15, 16, and 17. The individual webs are corrugated, with the respective wave contour remaining within the airfoil surface. This allows the webs to be tensioned within the airfoil surface and thus expandable and compressible. Furthermore, this wave structure provides stiffening perpendicular to the airfoil surface.

[0057] The webs can, for example, be made of a shape memory material such as Nitinol, which further facilitates the compression and expansion of the blade 12.

[0058] Basically, the blade 12 in the example shown consists of a substantially rectangular frame, the end edge strips 20, 21 of which are shown in Fig. 13, are rotated by 180 degrees around the rotation axis 10 relative to one another to form a helical structure. This results in a single, connected surface that extends radially on all sides of the rotation axis 10 and has blade areas at every height of the rotation axis that are opposite one another with respect to the rotation axis 10. This achieves a high degree of symmetry of the blade with a correspondingly symmetrical force distribution. In principle, the starting body can also have basic shapes other than rectangular, whereby it is advantageous if the body later covers the cross-section of a rotor housing as largely as possible in a helical shape and reproduces the inner contour of the housing as precisely as possible with its outer contour.

[0059] In the embodiment of the Fig. 12, Fig. 13, Fig. 14, Fig. 15, the shaft extensions 11 can be connected to the webs 15, 16, 17 and the edge strips 18, 19, 20, 21 in one piece or by a welded connection, so that the entire rotor can be manufactured particularly easily and cost-effectively and reliable connections for torque transmission are provided. The framework formed by the webs 15, 16, 17 and the edge strips 18, 19, 20, 21 is typically covered with a thin, highly flexible foil, which forms the actual conveying surface.

[0060] The blade is connected at one or both of its axial ends to a drive pin, which is axially connected to the blade.

[0061] The absence of a hub in the axial region of the blade 12 facilitates compression, as the webs can deform along their entire length. It also makes the rotor flexible, which can facilitate insertion in compressed form along a blood vessel. According to the described embodiment, the webs are connected at nodes in places, forming a network that provides additional rigidity to the blade.

[0062] The Fig. 16, Fig. 17 and Fig. 18 show, in two side views and a three-dimensional view, a rotor with a blade 12', in which the individual webs 15', 16' run essentially along the rotational axis 10 and thereby helically around it. This results in good compressibility in the radial direction for the rotor and, with the appropriate covering, a conveying surface that has only a few irregularities for the fluid to be conveyed, so that even at high speeds only relatively little damage to blood components is to be feared. Even at high fluid backpressure, which can occur at high rotor speeds, evasive movements of the blade 12' are strictly limited by good stabilization of the webs.In this embodiment, the blade as a whole can also be viewed as a rectangular frame, whose two opposite end edge strips 20', 21' are rotated 180 degrees relative to each other around the rotation axis 10. The manufacture of a corresponding flat frame with parallel webs 15', 16' is particularly simple.

[0063] The Fig. 20, Fig. 21, Fig. 22 show in two side views and in three-dimensional view a blade 12'' with two shaft extensions 11', wherein the blade has webs 15'', 16'' running horizontally transversely to the rotation axis 10, which are each straight in themselves, but give the blade 12'' as a whole the same helical structure as in terms of contour in the blade according to Fig. 17. Particularly when the blade 12" is supported by and connected to an outer shell, the webs 15" and 16" of the blade 12" can be stretched particularly efficiently during the expansion movement, resulting in a stable blade. This also stabilizes the film stretched between the webs and the edge strips 20" and 21" so that it remains wrinkle-free in the fluid to be pumped.

[0064] Fig. Figure 23 shows a front view of the rotor with the webs extending beyond the axis of rotation.

[0065] The Fig. 24-27 show an embodiment similar to that shown in the Fig. 20-23, with an airfoil 12''', the webs 15''', 16''' running transversely to the axis of rotation 10, wherein the individual webs 15''', 16''' do not run straight, but are curved in a wave-like manner to achieve a possibly further improved airfoil geometry. This can be achieved, for example, by inserting a weakened region 30 in the middle of each web 15''', 16''', which makes it easier for each web to deviate from the straight direction when the airfoil 12''' assumes the illustrated helical shape. However, it can also be achieved by a defined pre-bending of the webs. The advantage achieved in this way is, on the one hand, that the webs assume a defined preferred direction during compression, so that undefined buckling loads on the webs do not occur during compression.A further advantage is that the pre-curved webs assume an increasingly straight shape when they deflect fluid pressure during operation, which is almost unavoidable with such elastic structures. The rotor of the . Fig. 24 to 27 could then, for example, in the operating state, the shape of the rotor of the Fig. Take 20 to 23.

[0066] In this embodiment, as in the others described above, the blade is surrounded by edge strips for fastening the film forming the conveying surface and for stabilizing the blade.

[0067] In principle, this allows Fig. The design principle shown in Figures 12 to 26 allows for any configuration of the webs, so that there are extensive optimization options to design the pattern according to the requirements.

[0068] In an advantageous embodiment, the webs are designed in such a way that when the rotor is deformed into the intended compressed shape, only elastic deformations occur, so that the rotor can automatically unfold into the intended decompressed shape after the forces triggering the compression have ceased.

[0069] This intended decompressed shape is not necessarily the shape of the rotor in the operating state, since the rotor may deform further under the influence of the fluid pressure.

[0070] A particularly advantageous design of the rotor is such that the rotor is subject to exclusively elastic deformations under the influence of the fluid pressure and has the optimal geometry for the application at the intended operating point.

[0071] Overall, the inventive design of the rotor of an axial pump with the corresponding blade allows a material-saving and technically simple production of the rotor, which combines good compressibility with high stability during operation.

[0072] The subject matter here includes, among others, the following aspects: 1. Rotor for an axial pump for conveying a fluid, having a rotational axis and having a blade having at least one partial surface extending transversely to the rotational axis thereover, wherein the blade has webs which connect different edge regions of the blade to one another, individually or as a network. 2. Rotor according to one of aspects 1 to 10, characterized in that the blade is hub-free. 3. Rotor according to one of aspects 1 to 11, characterized in that the blade is self-supporting. 4. Rotor according to aspect 1 or one of the following, characterized in that at least one web or the network of webs connects two edge regions of the blade across the axis of rotation. 5. Rotor according to aspect 1, characterized in that at least one web or the network of webs connects two edge regions of the blade which are opposite one another as seen in the longitudinal direction of the axis of rotation. 6. Rotor according to aspect 1 or one of the following, characterized in that two or more webs are provided which are parallel to one another or at a constant distance from one another. 7. Rotor according to aspect 1 or one of the following, characterized in that at least one of the webs is designed in a meandering shape. 8. Rotor according to aspect 1 or one of the following, characterized in that the webs consist of a shape memory alloy. 9. Rotor according to aspect 1 or one of the following, characterized in that edge regions of the blade are designed as edge strips. 10. Rotor according to aspect 9, characterized in that the blade is surrounded by a continuous edge strip. 11. Rotor for an axial pump for conveying a fluid with an axis of rotation and with a blade, characterized in that the blade is designed hubless as a body which is flat in terms of its contour and which is spirally twisted about an axis. 12. Rotor according to aspect 11, characterized in that the blade is made as a latticework or network of webs from a flat sheet. 13. Rotor according to aspect 12, characterized in that the blade, in particular from a Nitinol sheet, is produced by cutting out the webs, in particular by water cutting, laser cutting or electroerosion. 14. Rotor according to aspect 13, characterized in that the webs are shaped in a meandering manner in the plane of the sheet metal and / or perpendicular thereto. 15. Rotor according to aspect 13, characterized in that the webs have a different area moment of inertia in the sheet plane than perpendicular thereto. 16. Rotor according to aspect 1 or one of the following, characterized in that the blade is firmly connected to a hollow cylindrical component surrounding it. 17. Rotor according to aspect 1 or one of the following, characterized in that a film is stretched between the webs and the edge of the blade. 18. Rotor according to aspect 1 or one of the following, characterized in that the blade is optionally radially compressible together with the hollow cylindrical component.

Claims

[1] Compressible rotor for an axial pump for conveying a fluid, having an axis of rotation (10) and having a blade (12, 12', 12'', 12''') which has at least one partial surface which extends transversely to the axis of rotation over the latter, wherein the blade has webs (15, 15', 15'', 15''', 16, 16', 16'', 16''', 17) which each individually or as a network connect one or more further webs, each forming an edge of the blade, in different edge regions of the blade, wherein the connecting webs and the further webs which form the edge of the blade are made of the same material. [2] Rotor according to one of claims 1 to 10, characterized by that the blade (12, 12', 12'', 12''') is hub-free. [3] Rotor according to one of claims 1 to 11, characterized by that the blade (12, 12', 12'', 12''') is self-supporting. [4] Rotor according to claim 1 or one of the following, characterized by that at least one web (15'', 15''', 16, 16'',16''') or the network of webs connects two edge regions of the blade (12, 12'', 12''') across the axis of rotation (10). [5] Rotor according to claim 1, characterized by that at least one web (15', 16') or the network of webs connects two edge regions (20) of the blade (12') which are opposite one another as seen in the longitudinal direction of the axis of rotation. [6] Rotor according to claim 1 or one of the following, characterized by that two or more webs (15, 15', 15'', 15''', 16, 16', 16'', 16''', 17) are provided which are parallel to one another or at a constant distance from one another. [7] Rotor according to claim 1 or one of the following, characterized by that at least one of the webs (15, 16, 17) is designed in a meandering shape. [8] Rotor according to claim 1 or one of the following, characterized bythat the webs (15, 15', 15'', 15''', 16, 16', 16'', 16''', 17) consist of a shape memory alloy. [9] Rotor according to claim 1 or one of the following, characterized by that edge regions (18, 19, 20, 20', 20'', 21, 21', 21'') of the blade are designed as edge strips or edge webs. [10] Rotor according to claim 9, characterized by that the blade (12, 12', 12'', 12''') is surrounded by a continuous edge strip / a continuous edge web. [11] Compressible rotor for an axial pump for conveying a fluid with a rotational axis (10) and with a blade (12, 12', 12'', 12'''), characterized by that the blade (12, 12', 12'', 12''') is designed hubless as a body which is flat in terms of its contour and which is spirally twisted around an axis. [12] Rotor according to claim 1 or one of the following, characterized bythat the blade is made as a latticework or network of webs (15, 15', 15'', 15''', 16, 16', 16'', 16''', 17) from a flat sheet. [13] Rotor according to claim 12, characterized by that the blade is produced by cutting out the webs (15, 15', 15'', 15''', 16, 16', 16'', 16''', 17), in particular by water cutting, laser cutting or electroerosion, wherein the blade is produced in particular from a Nitinol sheet. [14] Rotor according to claim 13, characterized by that the webs (15, 15', 15'', 15''', 16, 16', 16'', 16''', 17) are meander-shaped in the plane of the sheet and / or perpendicular thereto. [15] Rotor according to claim 13, characterized by that the webs (15, 15', 15'', 15''', 16, 16', 16'', 16''', 17) have a different area moment of inertia in the plane of the sheet than perpendicular to it.

Images