MOTOR FOR A BLOOD PUMP, MOTOR ASSEMBLY AND BLOOD PUMP

Abstract

The present disclosure relates to a motor 60 for a blood pump. The motor 60 has a first motor end 68 and a second motor end 70 and comprises a motor housing 62, a stator 64 arranged in the motor housing 62, a rotor 66 arranged in the motor housing 62, a fluid path 72 extending within the motor 60 between the first motor end 68 and the second motor end 70, and a drive shaft 132 coupled to the rotor 66. The rotor 66 is rotatable about an axially extending axis of rotation RA. A portion of the fluid path 72 is arranged between the stator 64 and the rotor 66 in a radial direction relative to the axis of rotation RA and forms a fluid guide gap 74. The fluid path 72 includes a fluid guide structure 160. The present disclosure further relates to a motor arrangement and to a blood pump.

Description

[0001] The present disclosure relates to the field of medical technology. The present disclosure relates to a motor for a blood pump, a motor assembly, and a blood pump. BACKGROUND OF THE REVELATION

[0002] Cardiac support devices for assisting a patient's cardiac function are known in the prior art. Such devices can include an implantable blood pump component, which can be inserted minimally invasively into a heart chamber, for example. Furthermore, an external (or extracorporeal) motor can be used to drive the blood pump and generate blood flow, for example, to discharge blood from the left ventricle into the aorta. The motor can be connected to the pump component via a transcutaneous and flexible drive shaft, which can be rotatably mounted within a transcutaneous catheter. The implantable components of the device can be inserted through the femoral artery via a puncture site, for example, in the patient's groin. Of course, the implantable components of the device can also be inserted, for example, via the axillary artery.

[0003] To prevent clotting at the pump component, a flushing medium or fluid is introduced to the pump component via the transcutaneous catheter. The flushing fluid is usually a solution, such as a glucose or saline solution.

[0004] Furthermore, there are specific requirements for the external motor of such a blood pump. On the one hand, the motor must be compact, efficient, and powerful. On the other hand, heat dissipation from the motor must be optimized. During use, the motor is usually positioned close to the patient's body. If the heat generated by the motor during operation is not effectively dissipated, the motor can overheat. This, in turn, can lead to motor malfunctions. Moreover, motor overheating can pose a health risk to the patient if a hot motor housing comes into contact with the patient's skin, especially if the patient is unable to perceive the heat and react accordingly, for example, due to anesthesia or similar medications.

[0005] Several methods for optimizing heat dissipation are known from the prior art. Cooling fins can be attached to the outer surface of the motor to facilitate heat exchange between the motor and the ambient air. However, the amount of heat dissipated may be insufficient, and deposits can accumulate between the cooling fins, which in turn impairs heat transfer.

[0006] Therefore, it is known from the prior art to provide liquid cooling in which the cleaning fluid is used to cool the engine. A corresponding engine is known, for example, from EP 4 104 894 A1. The disclosure contained therein is hereby adopted in its entirety.

[0007] If the flushing fluid is used to cool the engine, some engine components must be sealed against the flushing fluid. Furthermore, the flushing fluid must be circulated optimally to achieve sufficient heat transfer.

[0008] Therefore, one objective of the present disclosure is to provide a motor for a blood pump that has improved heat transfer and meets increased sealing requirements against liquids. SUMMARY OF THE REVELATION

[0009] According to a first aspect, a motor for a blood pump has a first motor end and a second motor end. The motor comprises a motor housing, a stator arranged within the motor housing, a rotor arranged within the motor housing, a fluid path extending within the motor between the first motor end and the second motor end, and a drive shaft coupled to the rotor. The rotor may be rotatable about an axially extending axis of rotation. A portion of the fluid path may be arranged radially between the stator and the rotor relative to the axis of rotation, forming a fluid guide gap. The fluid path may include a fluid guide structure. Preferably, the fluid guide structure includes at least one transverse bore extending at least partially through the drive shaft. Since the fluid path extends partially between the stator and the rotor, optimized heat transfer is achieved.Furthermore, the fluid guidance structure improves the flow within the motor. Additionally, fluid from the fluid path can enter the drive shaft via the at least one transverse bore, which significantly facilitates heat transfer and dissipation.

[0010] Preferably, the fluid path is designed to accommodate a flow of flushing fluid. The flushing fluid is preferably introduced into the motor at the first motor end.

[0011] The motor can have a fluid connection at its first end, extending into the motor housing. The fluid guide structure can have a funnel-shaped outlet opening towards the rotor, which is connected to the fluid connection. The fluid introduced through the fluid connection is thus optimally distributed within the motor via the funnel-shaped outlet opening.

[0012] The rotor can comprise a rotor housing and a magnet. The rotor housing can include a rotor sleeve. The rotor housing can have a first shaft extension arranged at a first end of the rotor sleeve, and it can have a second shaft extension arranged at a second end of the rotor sleeve. The magnet can be mounted inside the rotor sleeve. The rotor housing is preferably liquid-tight so that no liquid or cleaning fluid comes into contact with the magnet. This prevents corrosion of the magnet.

[0013] The first shaft extension can have a first tapered section facing the first end of the motor. This first tapered section can be located, at least partially, within the funnel-shaped outlet opening. This allows for optimal guidance of the fluid exiting through the funnel-shaped outlet opening.

[0014] The drive shaft can be attached to the second shaft extension. The drive shaft can have a drive shaft opening that extends at least partially along its axial dimension. The drive shaft opening preferably includes a torque transmission element. The torque transmission element is preferably an internal profile. The internal profile can be a square profile or a square hole. The drive shaft is preferably formed integrally with the second shaft extension. Accordingly, the rotation of the rotor can be transmitted to the drive shaft and to a flexible shaft connected to the torque transmission element.

[0015] The fluid guide structure can be connected to the drive shaft opening. Preferably, the at least one transverse bore opens into the drive shaft opening. The at least one transverse opening preferably connects the fluid guide gap to the drive shaft opening. In this way, the fluid flowing through the fluid guide gap is directed to the drive shaft opening.

[0016] The second shaft extension can have a circular cylindrical recess facing the magnet. Preferably, the circular cylindrical recess is a bore. A plug can be arranged in the recess. The plug preferably comprises a circular cylindrical plug body and a projection extending axially from the plug body towards the magnet. The recess is preferably filled with a potting compound. Preferably, the cylindrical recess is connected to the drive shaft opening. A cylindrical recess designed as a bore is easy to manufacture, and the plug seals the interior of the rotor housing, thus preventing the ingress of liquid. Preferably, the plug is connected to the circular cylindrical recess by an interference fit.This prevents the potting compound from entering the drive shaft opening while it is being poured into the circular cylindrical recess. The protrusion facilitates the installation of the plug and also provides reinforcement for the potting compound held in the cylindrical recess, thus securing the plug in place.

[0017] The motor can include a first bearing element. The rotor housing can be supported by the first bearing element so that it can rotate relative to the stator about the axis of rotation. The first bearing element can be preloaded by a preload element. This allows the bearing to be preloaded with the required force and, furthermore, only permits axial movement to compensate for manufacturing tolerances and small deviations due to heating during use.

[0018] A first spacer can be arranged between the prestressing element and the first bearing element. The first spacer preferably consists of a plastic, ideally a thermoplastic material such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), or the like. The spacer prevents the prestressing element from tilting or tipping. Furthermore, the aforementioned materials possess excellent mechanical and chemical resistance properties, which are retained even at elevated temperatures.

[0019] The preload element can be a single wave spring or a stack of wave springs, a disc spring or a stack of disc springs, a wave spring washer or a stack of wave spring washers, or a so-called Smalley spring.

[0020] The rotor housing can be supported by a second bearing element. This second bearing element can be attached to the motor housing. A second spacer can rest axially against the second bearing element. The second spacer is preferably made of a plastic, preferably a thermoplastic material such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), or the like. This allows for optimal support of the rotor housing relative to the motor housing.

[0021] The first shaft extension can have a second tapered section. The second tapered section is preferably spaced apart from the first tapered section. Either the first bearing element or the second bearing element can be arranged between the first and second tapered sections. Preferably, the fluid guide gap is located near the second tapered section. Thus, the first tapered section allows fluid to flow along or through the bearing element, and the second tapered section provides optimal guidance towards the fluid guide gap. As the annular region narrows towards the fluid guide gap, the velocity of the fluid in the fluid guide gap increases.

[0022] According to a second aspect, a motor assembly comprises a motor as described above. The motor assembly may include a connecting piece. The connecting piece may be arranged at the second end of the motor. The connecting piece may have a central through-opening extending through it. The drive shaft may be arranged, at least partially, within the central through-opening of the connecting piece. The motor assembly may include a flexible shaft. The flexible shaft may be accommodated in the central through-opening of the connecting piece, and the flexible shaft may be coupled to the drive shaft in a torque-transmitting manner. Preferably, a sealing element is arranged between the connecting piece and the motor housing. The connecting piece is preferably screwed to the motor housing at the second end of the motor housing.

[0023] The motor assembly can include a catheter, and the central through-hole of the connector can include a catheter attachment section. A portion of the catheter can be attached to the catheter attachment section. The flexible shaft can extend through the catheter. The catheter attachment is preferably bonded to the catheter attachment section. The connector can have at least one adhesive-transfer opening extending from an outer circumferential surface of the connector into the catheter attachment section. This facilitates the assembly and attachment of the catheter to the motor.

[0024] According to a third aspect, a blood pump comprises a motor as described above or a motor arrangement as described above.

[0025] The blood pump can comprise a pump section. The pump section can comprise a compressible and expandable housing and a compressible and expandable impeller arranged within the compressible and expandable housing. Preferably, the compressible and expandable housing has a diameter of at most 11 French in the compressed state. Even more preferably, the compressible and expandable housing has a diameter of at most 9 French in the compressed state. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The foregoing summary and the following detailed description of preferred embodiments will be better understood when read in conjunction with the accompanying drawings. Reference is made to the drawings for the purpose of illustrating the present disclosure. The accompanying drawings are not drawn to scale. In the drawings, identical or corresponding components shown in different figures are represented by the same reference numeral. For the sake of clarity, not every component is labeled in every drawing. The scope of the disclosure is not limited to the specific embodiments shown in the drawings.

[0027] The drawings contain: Fig. 1 A schematic representation of an intravascular blood pump located in the left ventricle of the heart, Fig. 2 a representation of a pump part of the blood pump of Fig. 1, Fig. 3 a cross-section through a motor for driving the blood pump according to a first embodiment, Fig. 4 A detailed view of the first side of a bearing element of the motor of Fig. 3, Fig. 5 a detailed view of a second side of the bearing section of Fig. 4, Fig. 6 a detail of an engine arrangement comprising the engine according to the first embodiment, Fig. 7 a cross-section through a motor according to a second embodiment, Fig. 8 a cross-section through a motor according to a third embodiment, and Fig. 9 a cross-section through a motor according to a fourth embodiment. DETAILED DESCRIPTION

[0028] Fig. Figure 1 shows the use of a blood pump 10 to support the heart H of a patient. The blood pump 10 in this example is an intravascular blood pump 10. In this specific example, the intravascular blood pump 10 supports the left ventricle LV of the patient's heart H. As shown schematically, the intravascular blood pump 10 comprises a catheter 12 and a pump unit 14 located at a distal end of the catheter 12.

[0029] The intravascular blood pump 10 can be introduced into the heart using a percutaneous, transluminal technique. For example, the intravascular blood pump 10 can be introduced through a femoral artery. However, other vascular access routes are also possible, such as access via the subclavian or axillary artery. After passing through the femoral artery, the catheter 12 can be advanced into the aorta, allowing the pump component 14 to pass through the aortic valve into the patient's heart H. The positioning of the pump component 14 in Fig. Figure 1 serves only as an example, although other placements are also possible, such as the positioning of pump part 14 in the right ventricle of the patient's heart H.

[0030] The catheter 12 contains a flexible shaft 22, which is driven by a motor 60, preferably located outside the patient's body, as will be explained in more detail below. The flexible shaft 22 drives a pump element 16 located inside the pump part 14. At its distal end, the pump part 14 has a flexible, atraumatic tip 24 in the form of a pigtail or a J-shape, which facilitates the placement of the intravascular blood pump 10 by aiding navigation within the patient's vascular system. Furthermore, the flexibility of the flexible, atraumatic tip 24 allows the pump part 14 to rest atraumatically against the wall of the left ventricle (LV).

[0031] As in Fig. As shown in Figure 2, the pump element 16 is arranged in a pump part housing 26. The pump part housing 26 consists of a series of struts 28. The pump element 16 has the shape of an impeller with at least one blade 54. The rotation of the impeller 16 about a central axis causes blood to flow from a blood flow inlet 18 at a distal end of the pump part 14 to a blood flow outlet 20 located proximal to the blood flow inlet 18. The pump part housing 26 comprises an inner coating layer 30 and an outer coating layer 32 around the struts 28, the coating extending from the blood flow inlet 18 to the blood flow outlet 20 by a fixed distance 34. The coating layers 30 and 32 consist of a suitable coating material, e.g., polyurethane.

[0032] A drainage tube 36 is connected to, covered by, and surrounding the blood flow outlet 20 with the outer coating 32. The drainage tube 36 is compressible. The drainage tube 36 is made of a suitable biocompatible material, e.g., a suitable polymer such as polyurethane, polyamide, nylon, or silicone. Preferably, the drainage tube 36 is made of polyurethane (PU) or polytetrafluoroethylene (PTFE). Of course, the drainage tube 36 can also be made of another suitable material, such as polyethylene terephthalate (PET) or a polyamide. As shown in Fig. As shown in Figure 1, the outflow tube comprises 36 outlet openings 52. Here, the outlet openings 52 are located in the aorta. The blood exiting the blood flow outlet 20 flows along the inside of the outflow tube 36 and is supplied to the aorta via the outlet openings 52.

[0033] The impeller 16 is offset from the blood flow inlet 18 by a predetermined distance 38. The impeller 16 is typically positioned such that a leading edge 40 of the impeller 16 is surrounded by the coating layers 30, 32. A trailing edge 42 of the impeller 16 may also be surrounded by the coating or extend beyond the trailing edge of the coating.

[0034] However, if the impeller 16 extends beyond the coating, at least a part 46 of the total length 44 of the impeller 16 is surrounded by the coating layers 30, 32.

[0035] As in Fig. As shown in Figure 2, the pump part 14 also includes a mesh 48. The mesh 48 has smaller openings than the openings formed by the struts 28 that constitute the housing. The mesh 48 is directly connected to the struts 28 that form the pump part housing 26 or to the outer coating layer 32. In some embodiments, the mesh 48 may be directly connected to one or more struts 50 that are located upstream (in the direction of blood flow) from the struts 28 that form the pump part housing 26. In some embodiments, the mesh 48 may not be directly connected to the struts 28, 50. The mesh 48 is located upstream of the impeller 16. In some embodiments, the mesh 48 may be located within an internal volume defined by the struts 28, 50. In some embodiments, the mesh 48 may be located outside the struts 28, 50. The struts 28, 50 are made of a suitable material, such as Nitinol.

[0036] In this embodiment, both the impeller 16 and the pump housing 26 are compressible and expandable. To position the blood pump 10, the pump unit 14 is advanced through the patient's vascular system while the impeller 16, the pump housing 26, and the outflow tube 36 are in a compressed state. Once the pump unit 14 is in its target position, the pump housing 26 and the impeller 16 expand. The resulting blood flow then also expands the outflow tube 36.

[0037] Fig. Figure 3 shows a first embodiment of a motor 60 in a side sectional view. The motor 60 is a brushless motor used to drive the flexible shaft 22 and thus the impeller 16. The motor 60 comprises a motor housing 62, a stator 64, and a rotor 66. Furthermore, the motor 60 has a first motor end 68 at a proximal end and a second motor end 70 at a distal end. A fluid path 72 extends within the motor 60 between the first motor end 68 and the second motor end 70, as described in more detail below. In particular, the motor housing 62 is designed such that a fluid can flow through it in a fluid guide gap 74. As shown, the fluid guide gap 74 is an annular gap located between the stator 64 and the rotor 66. Thus, the fluid guide gap 74 is part of the fluid path 72.The stator 64 is arranged in a fluid-tight stator chamber 76. The guide gap 74 has a constant height essentially along the axial extent of the stator 64, i.e., along the entire length of the stator 64 in the axial direction.

[0038] The stator chamber 76 is bounded in the direction of the rotor 66, i.e., in the radial direction, by an inner sleeve 80. The rotor 66 is arranged within the inner sleeve 80. The rotor 66 comprises, in particular, a rotor housing 82 and a permanent magnet 84 arranged in the rotor housing 82. The rotor 66 is thus also designed to be liquid-tight and is located in a rotor chamber 78, which is filled with liquid, in particular with cleaning fluid, during operation, as will be described in more detail below.

[0039] The rotor 66 is supported by rotor bearing elements 86, 88, namely a proximal bearing element 86 and a distal bearing element 88. In this embodiment, the proximal bearing element 86 is a first bearing element and the distal bearing element 88 is a second bearing element.

[0040] The rotor 66 is rotatable about a rotational axis RA, which extends centrally through the motor housing 62 in the axial direction. The rotor bearing elements 86, 88 are designed as ball bearings, with the cages 192 made of polyetheretherketone (PEEK), see also Fig. 4 and Fig. 5. The outer bearing rings 194 of the bearing elements 86, 88 are supported on an inner circumferential surface 90 of the inner sleeve 80. A sliding fit is formed between the bearing elements 86, 88 and the inner sleeve 80. Fluid flowing in the fluid guide gap 74 between rotor 66 and stator 64 can flow through the bearing elements 86, 88.

[0041] As in the Fig. 4 and Fig. As shown in Figure 5, the cage 192 of each bearing element 86, 88 is a single-piece element comprising a first side 198 that is largely open and a second side 200 that is largely closed. Thus, the cage 192 of each bearing element 86, 88 is designed as a snap-fit ​​cage that secures the rolling elements 202 by means of a snap connection. In the installed state, the first side of each bearing element 86, 88 faces the first motor end 68. This facilitates the passage of the fluid along the fluid guide gap 74 and thus through the bearing elements 86, 88.

[0042] The inner sleeve 80 is formed in one piece from polyetheretherketone (PEEK) and defines the rotor chamber 78 in the radial direction. In this particular embodiment, the inner sleeve 80 defines the entire space within the motor housing 62 through which a fluid can flow in the axial direction. At least in the region of the axial extent of the stator 64, the inner sleeve 80 has an annular cylindrical section with a constant wall thickness, preferably about 0.5 mm. As shown, the annular cylindrical section is hollow. The motor housing 62 also includes an outer sleeve 92, which likewise defines the stator chamber 76 in the radial direction. The outer sleeve 92 is preferably made of corrosion-resistant steel and has a wall thickness of about 0.5 mm.

[0043] The inner sleeve 80 and the outer sleeve 92 are supported at the second motor end 70 by a motor flange 94. The outer sleeve 92 is partially mounted onto the motor flange 94 and fastened, for example, by laser welding. The motor flange 94 includes an external thread 156 on an outer circumferential surface. The inner sleeve 80 includes a flange section 96 that extends into the motor flange 94 at the second motor end 70. Preferably, the flange section 96 is pressed into the motor flange 94. The flange section 96 extends in a central recess 98 within the motor flange 94. As shown in Fig. As shown in Figure 3, the inner sleeve 80 extends to the end of the motor flange 94 and is flush with the motor flange 94.

[0044] The inner sleeve 80 rests against the motor flange 94 with a collar-shaped extension 100 in the axial direction along the axis of rotation RA. The stator 64 is arranged beyond the collar-shaped extension 100 in the stator chamber 76. The wall thickness of the inner sleeve 80 is at least twice as large in the region of the flange section 96 as in the region of the fluid guide gap 74 between the stator 64 and the rotor 66. Furthermore, the flange section 96 includes a section with a reduced diameter 102, which forms a mounting edge 104 within the flange section 96 for receiving a distal spacer 124. The distal spacer 124 is a tubular element and, in this embodiment, represents the second spacer. As shown in Fig. As shown in Figure 3, the second spacer 124 rests on one side against the mounting edge 104 and on the other side against the second bearing element 88, so that the second bearing element 88 is supported in the axial direction.

[0045] At the first motor end 68 of the motor 60 or the motor housing 62, a centering flange 106 is arranged between the outer circumferential surface of the inner sleeve 80 and the inner circumferential surface of the outer sleeve 92. The centering flange 106 maintains a distance between the inner sleeve 80 and the outer sleeve 92. The centering flange 106 also limits the stator chamber 76 in the axial direction. The stator chamber 76 is, for example, completely filled with a first potting material 108. Preferably, the first potting material 108 has a viscosity of at most 200 cPs in its uncured state. This largely prevents air accumulation when applying the first potting material 108.

[0046] At the first motor end 68, the motor housing 62 or the motor 60 is completely sealed by a second potting material 110. The second potting material 110 is largely flush with the outer sleeve 92 in the axial direction. The inner sleeve 80 projects into the second potting material 110 and terminates within it. An electrical connection cable 112 and a fluid connection 114 extend through the second potting material 110 into the motor housing 62. The fluid connection 114 includes a connection profile 116 on an outer circumferential surface, for example, for a hose. Furthermore, the fluid connection 114 has a fluid port 118, which serves to introduce the fluid flowing along the fluid path 72 and into the fluid guide gap 74.

[0047] Furthermore, the fluid connection 114 has an undercut section 119 on its outer circumferential surface, which ensures a positive fit in the second potting material 110. This prevents movement of the fluid connection 114 relative to the motor housing 62 and the second potting material 110 when a force is exerted on the fluid connection 114, e.g., when attaching or detaching a hose. In the embodiment shown, the undercut section 119 is completely circumferential. However, the undercut section 119 can also have a different configuration, e.g., partially circumferential or in the form of cuts or notches.

[0048] The fluid to be introduced is preferably a rinsing medium or rinsing liquid, e.g., a glucose solution or saline solution. As in Fig. As shown in Figure 3, the fluid connection 114 comprises a larger diameter section that is fitted into the inner sleeve 80, i.e., the larger diameter section of the fluid connection 114 contacts the inner circumferential surface 90 of the inner sleeve 80. Preferably, the larger diameter section of the fluid connection 114 forms a sliding fit with the inner sleeve 80.

[0049] A preload element 120 in the form of a single wave spring and a proximal first spacer 122 are arranged between the fluid seal 114 and the first bearing element 86. In this embodiment, the proximal spacer 122 is a first spacer. As shown, the first spacer 122 is arranged between the preload element 120 and the first bearing element 86. The first preload element 120 preloads the first bearing element 86 in the direction of the second motor end 70. The first spacer 122 prevents the preload element 120 from tilting and thus from penetrating the first bearing element 86. Since the bearing elements 86, 88 are slidably mounted on the inner circumferential surface 90 of the inner sleeve 80, they are preloaded against each other by the preload force of the preload element 120.The first spacer 122 consists of a suitable biocompatible material, in particular a plastic, preferably a thermoplastic material such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE) or the like.

[0050] The rotor housing 82 comprises a rotor sleeve 126, a first shaft extension 128, and a second shaft extension 130. The first shaft extension 128 is attached to the rotor sleeve 126 in the direction of the first motor end 68, and the second shaft extension 130 is attached to the rotor sleeve 126 in the direction of the second motor end 70. The rotor sleeve 126 is fluid-tightly connected to the shaft extensions 128 and 130, for example, by welding, in particular by laser welding.

[0051] The first shaft extension 128 extends at least partially into the rotor sleeve 126 and is supported by the first bearing element 86, in particular by the inner ring 196 of the first bearing element 86. The first shaft extension 128 comprises a first tapered section 166 at the end facing the first motor end 68. Furthermore, the first shaft extension 128 has a second tapered section 168, which is arranged between the first bearing element 68 and the fluid guide gap 74. The second shaft extension 130 also extends at least partially into the rotor sleeve 126 and is supported by the second bearing element 88, in particular by the inner ring 196 of the second bearing element 88. Furthermore, a drive shaft 132 is coupled to the second shaft extension 130. The drive shaft 132 is formed in one piece with the second shaft extension 130 and protrudes from the motor housing 62 at the second motor end 70.The drive shaft 132 comprises a drive shaft opening 134 and a circular cylindrical recess 136, which is connected to the drive shaft opening 134. The drive shaft opening 134 is designed to receive the flexible shaft 22 for torque transmission, see also . Fig. 4. Therefore, the drive shaft opening 134 includes a torque transmission element 138 in the form of an inner profile. In this embodiment, the inner profile 138 is a square profile.

[0052] Furthermore, the first shaft extension 128 and the second shaft extension 130 can also be used to balance the rotor 66 when removing material.

[0053] The circular cylindrical recess 136 faces the magnet 84 and is provided for manufacturing reasons. The circular cylindrical recess 136 is closed with a plug 140, which prevents the ingress of liquid into the rotor 66. The plug 140 comprises a circular cylindrical plug body 142 and a projection 144, which extends axially from the circular cylindrical plug body 142 towards the magnet 84. The circular cylindrical plug body 142 is pressed into the circular cylindrical recess 136. The circular cylindrical recess 136 is filled with a third potting material 146, with the projection 144 facilitating the assembly of the plug 140 and also acting as a kind of reinforcing structure for the third potting material 146.

[0054] The preloading element 120 exerts a preload force on the rotor 66 in the direction of the second motor end 70, so that the rotor 66 is supported against the mounting edge 104 at the second motor end 70 via the second bearing element 88 and the second spacer 124.

[0055] The stator 64 has a deflection yoke 148 with a plurality of individual laminations extending side by side in the stator chamber 76. The stator 64 also includes a coil assembly 150 with, for example, three coil pairs. The coil assembly 150 extends from the collar-shaped extension 100 to a circuit board carrier 152, which is provided on an outer circumferential surface of the inner sleeve 80. The circuit board carrier 152 has an annular shape and carries an annular printed circuit board 154. The printed circuit board 154 is connected to the electrical terminal 112 and serves for the electrical circuitry for operating the motor 60 in a known manner.

[0056] The fluid guidance path 72 further comprises a fluid guidance structure 160, which serves to optimally guide the fluid introduced through the fluid connection 118. The fluid guidance structure 160 comprises at least one transverse bore 162, which extends through the drive shaft 132 and, in particular, into the drive shaft opening 134. As shown in Fig. As shown in Figure 3, the fluid guide structure 160 comprises a plurality of transverse bores 162, which are evenly distributed around the circumference of the drive shaft 132. The transverse bores 162 are arranged between the fluid guide gap 74 and the second bearing element 88. The fluid guide structure 160 further comprises a funnel-shaped outlet opening 164, which is arranged directly next to the fluid connection 118 in the fluid connection 114. The first tapered section 166 of the first shaft extension 128 is partially arranged within the funnel-shaped outlet opening 164.

[0057] The fluid entering the motor housing 62 through the fluid connection 118 flows along the funnel-shaped outlet opening 164, which, in combination with the first tapered section 166 of the first shaft extension 128, directs the fluid to the first bearing element 86. After passing the first bearing element, the fluid is guided via the second tapered section 168 of the first shaft extension 128 to the fluid guide gap 74. The fluid guide gap 74 between the rotor 66 and stator 64 is dimensioned such that it has a height of approximately 0.5 mm at least along the axial extent of the rotor sleeve 126. Such a height of the fluid guide gap 74 has proven to be particularly advantageous for the efficiency of the motor 60. After exiting the fluid guide gap 74, part of the fluid enters the drive shaft 132 and the drive shaft opening 134 via the transverse bores 162.The fluid also flows partially through the second bearing element 88 and then further along the outer circumferential surface of the drive shaft 132 towards the second motor end 70. To assemble the motor 60, the outer sleeve 92 is first attached and welded to the motor flange 94, and the inner sleeve 80 is pressed into the central recess 98 of the motor flange 94 with its flange section 96. The annular space formed between the outer sleeve 92 and the inner sleeve 80 (i.e., the stator chamber 76) is then filled with the first potting material 108, which preferably has a viscosity of no more than 200 cPs in its uncured state. The coil assembly 150 and the deflection yoke 148 are inserted into the still liquid first potting material 108. Subsequently, the circuit board carrier 152, the printed circuit board 154, and the centering flange 106 are mounted.After inserting the centering flange 106, the cavities in the stator chamber 76 are filled with the first potting material 108. Subsequently, the second spacer 124 and the second bearing element 88, together with the pre-assembled rotor 66 including the first bearing element 86, are inserted into the rotor chamber 78 so that the second spacer 124 rests against the mounting edge 104.

[0058] The preload element 120 and the first spacer 122, together with the fluid connection 114, are then mounted in the inner sleeve 80. A predetermined force is then applied to the fluid connection 114. Finally, the second potting compound 110 is applied to the first motor end 68, and the force on the fluid connection 114 is maintained until the second potting compound 110 has fully cured. Preferably, the pre-assembly of the stator 64 up to the insertion of the centering flange 106 and the curing of the first potting compound 108, as well as the pre-assembly of the rotor 66, can be carried out outside a cleanroom. In particular, balancing the rotor 66 can lead to deposits, so magnetizing the rotor preferably takes place after balancing to prevent the deposits from adhering to the rotor 66.The assembly of the rotor 66 in the stator 64, including the application and curing of the second potting material 110, is preferably carried out in a cleanroom.

[0059] Fig. Figure 6 schematically shows a motor assembly 170 with a motor 60 as described above. The motor assembly 170 includes a connecting piece 172, which is attached to the second motor end 70. In particular, the connecting piece 172 includes an internal thread 174, which is screwed onto the external thread 156 of the motor flange 94. A sealing element 176 is arranged between the second motor end 70 and the connecting piece 172 to prevent fluid from escaping from the motor assembly 170 in the area of ​​the threads 156 and 174. The sealing element 176 is an annular element provided at the second motor end 70 on the end face of the motor flange 94.

[0060] The connector 172 comprises a central through-opening 178 extending through the connector 172. As shown, the central through-opening 178 includes a first opening section 180 and a second opening section 182, which are connected by an intermediate opening section 184. The first opening section 180 has a larger diameter than the second opening section 182. The second opening section 182 has a larger diameter than the intermediate opening section 184. The drive shaft 132 is partially located within the first opening section 180. The second opening section 182 includes a catheter attachment section 186 and a plurality of adhesive transfer openings 188 extending from an outer circumferential surface of the connector 172 into the catheter attachment section 186.

[0061] As in Fig. As shown in Figure 6, the motor assembly 170 comprises the catheter 12 and the flexible shaft 22. A fastening part 190 of the catheter 12 is arranged in the catheter fastening section 186 and attached to it by adhesive. The adhesive for fastening the fastening part 190 of the catheter 12 to the catheter fastening section 186 is applied via the adhesive transfer openings 188. As shown, the fastening part 190 of the catheter 12 abuts the end of the second opening section 182, which forms the boundary with the intermediate opening section 184.

[0062] The flexible shaft 22 extends within the catheter 12 and through the intermediate opening section 184 into the drive shaft opening 134 of the drive shaft 132. The end of the flexible shaft 22 is slidably and torque-transmittingly received in the drive shaft opening 134; that is, the end of the flexible shaft corresponds to the inner profile of the drive shaft opening 134, e.g., in the form of a square plug. However, a certain amount of clearance between the end of the flexible shaft and the inner circumferential surface of the drive shaft opening 134 is necessary to allow the passage of fluid and axial movement of the end of the flexible shaft 22 within the drive shaft opening 134. This axial movement prevents the flexible shaft 22 from being subjected to axial stress during use. The clearance can be achieved, for example, by slightly reducing the diameter of the end of the flexible shaft 22 or by providing a groove.

[0063] The fluid exiting the drive shaft opening 134 rejoins the fluid flowing along the outer circumferential surface of the drive shaft 132 and enters the catheter 12 through the intermediate opening section 184. Since the fluid is preferably a rinsing fluid, it is used to prevent clumping in the pump part 14.

[0064] In Fig. Figure 7 shows a second embodiment of a motor 260. The motor 260 according to the second embodiment differs from the motor 60 according to the first embodiment in the design of the proximal spacer 222, the distal spacer 224, and the preload element 220. In this embodiment, the distal spacer 224 is a first spacer within the meaning of the disclosure, and the proximal spacer 222 is a second spacer within the meaning of the disclosure. As such, the distal bearing element 88 is a first bearing element within the meaning of the disclosure, and the proximal bearing element 86 is a second bearing element within the meaning of the disclosure. The preload element 220 is designed in the form of a wave spring.

[0065] As in Fig. As shown in Figure 7, the preload element 220 is supported on a tubular section of the first spacer 224 and rests against the mounting edge 104 to exert a preload force on the first bearing element 88 via the first spacer 224. The first spacer 224 further comprises a third, tapered section 266 that tapers towards an outer circumferential surface of the drive shaft 132, so that the fluid flowing past the first bearing element 88 is guided along it. For better distribution of the fluid, particularly in the area where the preload element 220 is located, the first spacer 224 can have one or more axial grooves 280 on its outer surface and / or channels 282 to supply fluid to the area where the preload element 220 is located. Fig. 7 The axial grooves 280 and the channels 282 are schematically represented by dashed lines.

[0066] Of course, the channels 282 can have a different design, and it is also possible to provide only the axial grooves 280 or the channels 282.

[0067] The second spacer 222 is arranged directly between the fluid connection 114 and the second bearing element 86. The first spacer 224 and the second spacer 222 are made of a biocompatible material, preferably a plastic material, preferably a thermoplastic material such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), or the like.

[0068] Fig. Figure 8 shows a third embodiment of a motor 360. The motor 360 according to the third embodiment differs from the motor 60 according to the first embodiment in the design of the proximal spacer 322, the distal spacer 324, and the preload element 320. In this embodiment, the distal spacer 324 is a first spacer within the meaning of the disclosure, and the proximal spacer 322 is a second spacer within the meaning of the disclosure. As such, the distal bearing element 88 is a first bearing element within the meaning of the disclosure, and the proximal bearing element 86 is a second bearing element within the meaning of the disclosure. The preload element 320 is designed in the form of a stack of wave springs.

[0069] As in Fig. As shown in Figure 8, the preload element 320 is supported on a tubular section of the first spacer 324 and rests against the mounting edge 104 to exert a preload force on the first bearing element 88 via the first spacer 324. For improved fluid distribution, particularly in the area where the preload element 320 is located, the first spacer 324 can have one or more axial grooves 380 on its outer surface and / or channels 382 to supply the area where the preload element 320 is located with fluid. Fig. Figure 8 shows the axial grooves 380 and the channels 382 schematically represented by dashed lines. Of course, the channels 382 can have a different configuration, and it is also possible to provide only the axial grooves 380 or only the channels 382.

[0070] The second spacer 322 is arranged directly between the fluid connection 114 and the second bearing element 86. The first spacer 324 and the second spacer 322 are made of a biocompatible material, preferably a plastic material, preferably a thermoplastic material such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), or the like.

[0071] In Fig. Figure 9 shows a fourth embodiment of a motor 460. The motor 460 according to the fourth embodiment differs from the motor 60 according to the first embodiment in the configuration of the fluid connection 414. In this embodiment, the proximal bearing element 86 is a first bearing element as defined in the disclosure, and the distal bearing element 88 is a second bearing element as defined in the disclosure. The preload element 420 is provided in the form of a stack of wave springs.

[0072] The fluid connection piece 414 is shortened such that a preload element receiving space 430 is formed between the first bearing element 86 and the fluid connection piece 414. The preload element 420 is positioned in the preload element receiving space 430 such that it exerts a preload force on the first bearing element 88. In this embodiment, a first spacer is not provided, but can be provided upon request. EXAMPLE EXECUTION FORMS

[0073] As already described, the technology described herein can be implemented in various ways. In this respect, the foregoing disclosure is intended to include, but is not limited to, the systems, methods, combinations and subcombinations thereof set forth in the following exemplary implementations. Preferred embodiments are described in the following sections: A1 Motor for a blood pump, the motor having a first motor end and a second motor end and comprising: a motor housing, a stator arranged inside the motor housing, a rotor arranged inside the motor housing, a fluid path extending inside the motor between the first motor end and the second motor end, and a drive shaft coupled to the rotor, the rotor being rotatable about an axis of rotation extending in an axial direction, a portion of the fluid path between the stator and the rotor being arranged in a radial direction relative to the axis of rotation forming a fluid guide gap, and the fluid path comprising a fluid guide structure (160). A2 Motor according to paragraph A1, wherein the fluid guidance structure has at least one transverse bore which extends at least partially through the drive shaft. A3 Motor according to paragraph A1 or A2, wherein the motor has a fluid connection at the first motor end extending into the motor housing, wherein the fluid guide structure has a funnel-shaped outlet opening in the direction of the rotor which is connected to the fluid connection. A4 Motor according to any of the preceding paragraphs A1 to A3, wherein the rotor comprises a rotor housing and a magnet, wherein the rotor housing comprises a rotor sleeve, a first shaft extension arranged at a first end of the rotor sleeve and a second shaft extension arranged at a second end of the rotor sleeve, wherein the magnet is fixed inside the rotor sleeve. A5 Motor according to paragraph A4, wherein the first shaft extension has a first tapered section facing the first end of the motor. A6 Motor according to paragraph A4 or A5, wherein the drive shaft is attached to the second shaft extension. A7 Motor according to any of the preceding paragraphs A1 to A6, wherein the drive shaft has a drive shaft opening which extends at least partially along the axial extent of the drive shaft. A8 engine according to paragraph A7, wherein the drive shaft opening includes a torque transmission element. A9 motor according to paragraph A8, wherein the torque transmission element is an internal profile. A10 motor according to paragraph A9, wherein the inner profile is a square. A11 Motor according to one of the previous sections A4 to A10, wherein the drive shaft is formed integrally with the second shaft extension. A12 Motor according to one of the previous sections A7 to A11, wherein the fluid guidance structure is connected to the drive shaft opening. A13 Motor according to one of the previous sections A7 to A12, wherein the at least one transverse bore opens into the drive shaft opening. A14 Motor according to one of the previous sections A4 to A13, wherein the second shaft extension has a circular cylindrical recess facing the magnet. A15 Motor according to paragraph A14, wherein a plug is arranged in the recess. A16 Motor according to paragraph A15, wherein the plug has a circular cylindrical plug base body and a projection extending axially from the plug base body towards the magnet. A17 Motor according to one of the preceding paragraphs A14 to A16, wherein the recess is filled with a potting material. A18 engine according to one of the preceding paragraphs A14 to A17, wherein the circular cylindrical recess is a bore. A19 Motor according to one of the preceding sections A4 to A18, wherein the motor comprises a first bearing element, wherein the rotor housing is supported by the first bearing element in such a way that it is rotatable relative to the stator about the axis of rotation, wherein the first bearing element is preloaded by a preloading element. A20 Motor according to section A19, wherein a first spacer is arranged between the preload element and the first bearing element. A21 Motor according to section A20, wherein the first spacer consists of a biocompatible material, preferably a plastic material, preferably a thermoplastic material such as polyetheretherketone, polyetherketoneketone, polytetrafluoroethylene, polyethylene or the like. A22 Motor according to any of the preceding paragraphs A19 to A21, wherein the preload element is a single wave spring or a stack of wave springs or a disc spring or a stack of disc springs or a wave spring washer or a stack of wave spring washers or a Smalley spring. A23 Motor according to one of the previous sections A4 to A22, wherein the rotor housing is supported by a second bearing element. A24 Motor according to paragraph A23, wherein the second bearing element is attached to the motor housing. A25 Motor according to paragraph A23 or A24, wherein a second spacer rests against the second bearing element in the axial direction. A26 Motor according to section A25, wherein the second spacer consists of a biocompatible material, preferably a plastic, preferably a thermoplastic material such as polyetheretherketone, polyetherketoneketone, polytetrafluoroethylene, polyethylene or the like. A27 Motor according to one of the previous sections A5 to A26, wherein the first shaft extension has a second, tapered section adjacent to the fluid guide gap. A28 Motor according to section A27, wherein the first bearing element or the second bearing element is arranged between the first tapered section and the second tapered section. A29 Motor according to any of the preceding paragraphs A1 to A28, wherein the motor has an inner sleeve arranged between the rotor and the stator. A30 motor according to section A29, wherein the first bearing element is supported on the inner sleeve. A31 Motor according to paragraph A29 or A30, wherein the second bearing element is mounted on the inner sleeve. A32 Motor according to any of the preceding paragraphs A29 to A32, wherein the inner sleeve is made of a biocompatible material, preferably a plastic, preferably a thermoplastic material such as polyetheretherketone, polyetherketoneketone, polytetrafluoroethylene, polyethylene or the like. A33 Motor according to one of the preceding paragraphs A29 to A32, wherein the inner sleeve in the region of the axial extent of the stator has a wall thickness of not more than 0.5 mm. A34 Motor according to one of the previous sections A29 to A33, wherein the fluid guide gap is formed between the inner sleeve and the rotor housing. A36 Motor according to one of the preceding paragraphs A1 to A34, wherein the fluid guide gap has a ring shape. A35 Motor according to section A36, wherein the fluid guide gap has a height of approximately 0.5 mm. A36 engine according to one of the preceding paragraphs A20 to A35, wherein the first spacer has a third tapered section. A37 Motor according to one of the preceding sections A19 to A36, wherein the first bearing element comprises a first cage, wherein the first cage is designed as a first snap cage. A38 engine according to paragraph A37, wherein the first snap cage has an open side and a closed side, the open side facing the first engine end. A39 Motor according to one of the previous sections A20 to A38, wherein the second bearing element comprises a second cage, the second cage being designed as a second snap cage. A40 engine according to paragraph A39, wherein the second snap cage has an open side and a closed side, the open side facing the first engine end. A41 Motor according to one of the preceding paragraphs A20 to A40, wherein the first spacer has at least one channel and / or at least one axial groove. A42 Motor according to one of the preceding sections A25 to A41, wherein the second spacer has at least one channel and / or at least one axial groove. A42 Motor according to any of the preceding paragraphs A1 to A42, wherein the stator is arranged in a stator chamber, the stator chamber being filled with a potting material. A43 Motor according to paragraph A42, wherein the potting material in the stator chamber has a viscosity of not more than 200 cPs in the uncured state. A44 Motor according to one of the preceding paragraphs A1 to A43, wherein a fluid connection is provided at the first end of the motor. A45 motor according to one of the preceding sections A1 to A44, wherein the motor housing is sealed at the first motor end with a potting material. A46 Motor according to section A45, wherein the fluid connection extends through the potting material sealing the first end of the motor. A47 Motor according to section A46, wherein the fluid connection has an undercut section on its outer circumferential surface which provides a positive fit in the potting material sealing the first end of the motor. B1 Motor assembly comprising a motor according to any of the preceding paragraphs A1 to A47, wherein the motor assembly comprises a connecting piece, the connecting piece being attached to the second end of the motor. B2 Motor arrangement according to paragraph B1, wherein the connecting piece has a central through-opening extending through the connecting piece, B3 Motor arrangement according to paragraph B2, wherein the drive shaft is arranged at least partially within the central through-opening of the connecting piece, B4 Motor arrangement according to paragraph B2 or B3, wherein the motor arrangement comprises a flexible shaft, the flexible shaft being received in the central through-opening of the connecting piece. B5 Motor arrangement according to one of the preceding paragraphs B1 to B4, wherein the flexible shaft is coupled to the drive shaft in a torque-transmitting manner. B6 Motor arrangement according to paragraph B5, wherein the flexible shaft has an end with an outer profile that matches the inner profile of the drive shaft opening. B7 Motor arrangement according to paragraph B6, wherein a clearance is provided between the end of the flexible shaft and the inner circumferential surface of the drive shaft opening. B8 Motor arrangement according to one of the preceding paragraphs B1 to B7, wherein a sealing element is arranged between the connecting piece and the motor housing. B9 Motor arrangement according to one of the preceding paragraphs B1 to B8, wherein the motor arrangement includes a catheter. B10 Motor arrangement according to paragraph B9, wherein the central through-opening of the connecting piece comprises a catheter attachment section, wherein an attachment part of the catheter is attached to the catheter attachment section. B11 Motor arrangement according to paragraph B10, wherein the fastening part of the catheter is glued to the catheter fastening section. B12 Motor arrangement according to paragraph B11, wherein the connector has at least one adhesive transfer opening extending from an outer circumferential surface of the connector into the catheter attachment section. B13 Motor arrangement according to one of the preceding paragraphs B9 to B12, wherein the flexible shaft extends through the catheter. B14 Motor arrangement according to one of the preceding paragraphs B1 to B13, wherein the connecting piece is screwed to the motor. C1 Blood pump with a motor according to one of the preceding paragraphs A1 to A36 or a motor arrangement according to one of the preceding paragraphs B1 to B14. C2 Blood pump according to paragraph C1, wherein the blood pump is an intravascular blood pump. C3 Blood pump according to paragraph C1 or C2, wherein the motor is an extracorporeal motor. C4 Blood pump according to one of the preceding paragraphs C1 to C3, wherein the blood pump includes an implantable pump part. C5 Blood pump according to paragraph C4, wherein the pump part is compressible and expandable. C6 blood pump according to paragraph C4 or C5, wherein the pump part comprises a pump part housing. C7 blood pump according to paragraph C6, wherein the pump housing is at least partially composed of struts. C8 blood pump according to paragraph C6 or C7, wherein the pump housing is at least partially made of nitinol. C9 Blood pump according to one of the preceding paragraphs C4 to C8, wherein a pump element is arranged within the pump part housing. C10 Blood pump according to paragraph C9, wherein the pump element is compressible and expandable. C11 Blood pump according to any one of paragraphs C6 to C10, wherein the pump part has an inner coating. C12 Blood pump according to any of the preceding paragraphs C1 to C11, wherein the pump part has an outer coating. C13 Blood pump according to any of the preceding paragraphs C1 to C12, wherein the pump part comprises at least one blood flow outlet and an outflow tube connected to the at least one blood flow outlet. C14 Blood pump according to paragraph C13, wherein the outflow tube is compressible and expandable. C15 Blood pump according to paragraph C13 or C14, wherein the outflow tube has at least one outlet opening.

[0074] As used herein, the terms “approximately,” “about,” “essentially,” and similar expressions are to be understood in a broad sense, consistent with the common and accepted usage of those knowledgeable in the field to which the subject matter of this disclosure relates. As used here, “proximal” and “distal” are understood in relation to the medical personnel or the physician. Thus, “proximal” refers to something relatively close to the physician, while “distal” refers to something relatively far from the physician when the blood pump is inserted into the patient’s body. Professionals reading this disclosure should understand that these terms are intended to allow for the description of certain characteristics without limiting the scope of those characteristics to the specified precise numerical ranges.Accordingly, these terms should be interpreted such that insignificant or inconsistent modifications or changes to the described subject matter are considered to fall within the scope of the disclosure. The terms "at least partially" or "partially" used here mean both partially and completely. Terms such as "first," "second," or "third" do not denote a specific order but merely serve to distinguish the elements semantically. LIST OF REFERENCE MARKS 10 Blood pump 12 catheters 14 Pump part 16 Pump element / impeller 18 Blood flow inlet 20 Blood flow outlet 22 flexible shaft 24 atraumatic tips 26 Pump housing components 28 struts 30 Interior coating 32 Exterior coating 34 fixed spacing 36 Drain hose 38 specified distance 40 leading edge of the impeller 42 rear edge of the impeller 44 Length of the wheel 46 parts of the impeller's length 48 network 50 strut 52 Outlet opening 54 shovels 60 engine 62 Engine housings 64 Stator 66 Rotor 68 first engine end 70 second engine end 72 Fluid path 74 Liquid guide gap 76 Stator chamber 78 Rotor chamber 80 inner sleeve 82 Rotor housings 84 Magnet 86 proximal bearing part 88 distal bearing part 90 inner circumferential surface of the inner sleeve 92 Outer sleeve 94 Engine flange 96 Flange section 98 central recess of the motor flange 100 collar-shaped extensions 102 Section with reduced diameter 104 Mounting edge 106 Centering flange 108 first potting material 110 second potting material 112 electrical connection 114 Liquid connection 116 Connection profile 118 Liquid connection 119 undercut section 120 prestressing element 122 proximal spacer 124 distal spacer 126 Rotor sleeve 128 first wave process 130 second wave process 132 Drive shaft 134 Drive shaft opening 136 circular cylindrical recess 138 Torque transmission element 140 plugs 142 plug base bodies 144 lead of the stopper 146 third potting material 148 Deflection yoke 150 coil arrangement 152 circuit board carriers 154 circuit board 156 external threads 160 Fluid Conveyor Structure 162 Cross bore 164 funnel-shaped outlet openings 166 first tapering part 168 second tapering part 170 Engine arrangement 172 Connecting piece 174 internal threads 176 Sealing element 178 central passageway 180 first opening section 182 second opening section 184 Intermediate opening section 186 Catheter attachment section 188 Adhesive transfer opening 190 Catheter attachment part 220 Preload element 222 proximal spacer 224 distal spacer 260 engine 266 third tapering section 280 Axial groove Channel 282 320 Preload element 322 proximal spacer 324 distal spacer 360 motor 380 Axial groove Channel 382 414 Liquid connection 420 Preload element 430 Prestressing element receiving space 460 engine RA axis of rotation H Heart LV left ventricle QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 4 104 894 A1

[0006]

Claims

Motor (60, 260, 360, 460) for a blood pump (10), wherein the motor (60, 260, 360, 460) has a first motor end (68) and a second motor end (70) and comprises: a motor housing (62), a stator (64) arranged within the motor housing (62), a rotor (66) arranged within the motor housing (62), a fluid path (72) extending within the motor (60, 260, 360, 460) between the first motor end (68) and the second motor end (70), and a drive shaft (132) coupled to the rotor (66), wherein the rotor (66) is rotatable about an axis of rotation (RA) extending in an axial direction, wherein a portion of the fluid path (72) is located between the stator (64) and the rotor. (66) is arranged in a radial direction relative to the axis of rotation (RA) and forms a fluid guidance gap (74), wherein the fluid path (72) comprises a fluid guidance structure (160). Motor (60, 260, 360, 460) according to claim 1, wherein the fluid guidance structure (160) has at least one transverse bore (162) which extends at least partially through the drive shaft (132). Motor (60, 260, 360, 460) according to claim 1 or 2, wherein the motor (60, 260, 360, 460) has a fluid connection (118) at the first motor end (68) extending into the motor housing (62), wherein the fluid guide structure (160) has a funnel-shaped outlet opening (164) in the direction of the rotor (66) which is connected to the fluid connection (118). Motor (60, 260, 360, 460) according to one of the preceding claims, wherein the rotor (66) has a rotor housing (82) and a magnet (84), wherein the rotor housing (82) has a rotor sleeve (126), a first shaft extension (128) arranged at a first end of the rotor sleeve (126), and a second shaft extension (130) arranged at a second end of the rotor sleeve (126), wherein the magnet (84) is fixed inside the rotor sleeve (126). Motor (60, 260, 360, 460) according to claim 4, wherein the first shaft extension (128) has a first tapered section (166) which faces the first motor end (68). Motor (60, 260, 360, 460) according to claim 4 or 5, wherein the drive shaft (132) is attached to the second shaft extension (130), wherein the drive shaft (132) has a drive shaft opening (134) which extends at least partially along the axial extent of the drive shaft (132), wherein the drive shaft opening (134) preferably has a torque transmission element (138), wherein the torque transmission element (138) is preferably an internal profile, and wherein the drive shaft (132) is preferably formed integrally with the second shaft extension (130). Motor (60, 260, 360, 460) according to claim 6, wherein the fluid guidance structure (160) is connected to the drive shaft opening (134). Motor (60, 260, 360, 460) according to claim 7, wherein the at least one transverse bore (162) opens into the drive shaft opening (134). Motor (60, 260, 360, 460) according to one of claims 4 to 8, wherein the second shaft extension (130) has a circular cylindrical recess (136) facing the magnet (84), preferably a bore, wherein a plug (140) is arranged in the recess (136), wherein the plug (140) preferably has a circular cylindrical plug base body (142) and a projection (144) extending axially from the plug base body (142) towards the magnet (84), wherein the recess (136) is preferably filled with a potting material (146). Motor (60, 260, 360, 460) according to one of claims 4 to 9, wherein the motor (60, 260, 360, 460) has a first bearing element (86, 88), wherein the rotor housing (82) is rotatably mounted by the first bearing element (86, 88) relative to the stator (64) about the axis of rotation (RA), wherein the first bearing element (86, 88) is preloaded by a preload element (120, 220, 320, 420). Motor (60, 260, 360) according to claim 10, wherein a first spacer (122, 220, 320) is arranged between the preload element (120, 220, 320) and the first bearing element (86, 88), wherein the first spacer (120, 220, 320) preferably consists of a plastic material, preferably a thermoplastic material such as polyetheretherketone, polyetherketoneketone, polytetrafluoroethylene, polyethylene or the like. Motor (60, 260, 360, 460) according to claim 10 or 11, wherein the preload element (120, 220, 320, 420) is a single wave spring or a stack of wave springs, or a disc spring or a stack of disc springs, or a wave spring washer or a stack of wave spring washers. Motor (60, 260, 360, 460) according to one of claims 4 to 12, wherein the rotor housing (82) is supported by a second bearing element (86, 88), wherein the second bearing element (86, 88) is attached to the motor housing (62), and wherein a second spacer (124, 222, 322) rests axially against the second bearing element (86, 88), wherein the second spacer (124, 222, 322) preferably consists of a plastic material, preferably a thermoplastic material such as polyetheretherketone, polyetherketoneketone, polytetrafluoroethylene, polyethylene or the like. Motor arrangement (170) with a motor (60, 260, 360, 460) according to one of the preceding claims, wherein the motor arrangement (170) comprises a connecting piece (172), the connecting piece (172) being arranged at the second motor end (70), the connecting piece (172) comprising a central through-opening (178) extending through the connecting piece (172), the drive shaft (132) being arranged at least partially within the central through-opening (178) of the connecting piece (172), the motor arrangement (170) comprising a flexible shaft (22), the flexible shaft (22) being received in the central through-opening (178) of the connecting piece (172), and the flexible shaft (22) being coupled to the drive shaft (132) in a torque-transmitting manner, and preferably a sealing element (176) being located between the connecting piece (172) and is arranged in the motor housing (62). Motor arrangement (170) according to claim 14, wherein the motor arrangement (170) comprises a catheter (12) and the central through-opening (178) of the connecting piece (172) comprises a catheter attachment section (186), wherein a fastening part (190) of the catheter (12) is attached to the catheter attachment section (186), wherein the flexible shaft (22) extends through the catheter (12), wherein the fastening part (190) of the catheter (12) is preferably bonded to the catheter attachment section (186). Motor arrangement (170) according to claim 15, wherein the connecting piece (172) has at least one adhesive transfer opening (188) extending from an outer circumferential surface of the connecting piece (172) into the catheter attachment section (186). Blood pump (10), in particular intravascular blood pump, with a motor (60, 260, 360, 460) according to one of claims 1 to 13 or a motor arrangement (170) according to one of claims 14 to 16 .

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