Motor for 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 includes a motor housing (62), a stator (64) disposed within the motor housing (62), a rotor (66) disposed within the motor housing (62), a fluid passage 72 extending inside the motor (60) between the first motor end (68) and the second motor end (70), and an output shaft (132) coupled with the rotor (66). The rotor (66) is rotatable about an axis of rotation (RA) extending in an axial direction. A portion of the fluid channel (72) is arranged between the stator (64) and the rotor (66) in a radial direction with respect to the axis of rotation (RA) and forms a fluid guide gap (74). The fluid channel (72) includes a fluid directing structure (160). The present disclosure also relates to a motor assembly and a blood pump.

Description

Technical Field

[0001] This disclosure relates to the field of medical technology. Specifically, it relates to a motor for a blood pump, a motor assembly, and a blood pump. Background Technology

[0002] Cardiac assist devices for assisting a patient's cardiac function are known in the prior art. Such devices may include an implantable pump component that can be inserted via a minimally invasive procedure, such as into the ventricle of the heart. Furthermore, an external (or extracorporeal) motor may be provided to drive the pump and establish blood flow to direct, for example, blood from the left ventricle into the aorta. The motor may be percutaneously connected to the pump component via a flexible drive shaft that is rotatably mounted within a percutaneous catheter. The implantable component of the device may be inserted via a puncture site (e.g., in the patient's groin) into the femoral artery. Alternatively, the implantable component may be inserted via, for example, the axillary artery.

[0003] To prevent blood clots from forming at the pump site, a cleaning medium or fluid is delivered to the pump site via a percutaneous catheter. Typically, the cleaning fluid is a solution such as glucose or saline.

[0004] Furthermore, the external motor of this blood pump needs to meet specific requirements. On one hand, the motor needs to be compact, efficient, and high-performing. On the other hand, the motor's heat dissipation must be optimized. During use, the motor is typically placed close to the patient's body. If the heat generated by the motor cannot be effectively dissipated during use, the motor may overheat. This could lead to motor malfunction. Moreover, when the motor's hot casing comes into contact with the patient's skin, especially when the patient is unable to perceive the heat or react appropriately due to factors such as anesthetic drugs, overheating can pose a health risk to the patient.

[0005] Several methods for optimizing heat dissipation are known in the prior art. Heat sinks can be installed on the outer surface of the motor to facilitate heat transfer between the motor and the surrounding air. However, the heat dissipation may be insufficient, and debris may accumulate between the heat sinks, further impairing heat transfer.

[0006] Therefore, liquid cooling is known from the prior art, in which a cleaning fluid is used to cool the motor. A corresponding motor has been disclosed, for example, in European Patent EP 4 104 894 A1, the disclosure of which is incorporated herein by reference in its entirety.

[0007] If a cleaning fluid is used to cool the motor, certain parts of the motor must be sealed to prevent the cleaning fluid from seeping in. Furthermore, the cleaning fluid must be optimally guided to achieve adequate heat transfer.

[0008] Therefore, the object of the present invention is to provide a motor for a blood pump that has improved heat transfer performance and ensures improved sealing requirements for the fluid. Summary of the Invention

[0009] According to a first aspect, a motor for a blood pump has a first motor end and a second motor end. The motor includes a motor housing, a stator disposed within the motor housing, a rotor disposed within the motor housing, a fluid passage extending internally between the first and second motor ends, and an output shaft coupled to the rotor. The rotor is rotatable about a rotation axis extending in an axial direction. A portion of the fluid passage may be disposed radially between the stator and rotor relative to the rotation axis, and may form a fluid guiding gap. The fluid passage may include a fluid guiding structure. Preferably, the fluid guiding structure includes at least one transverse aperture extending at least partially through the output shaft. Optimized heat conduction is achieved because the fluid passage extends partially between the stator and rotor. Furthermore, the fluid guiding structure improves flow within the motor. Additionally, fluid from the fluid passage can enter the output shaft via the at least one transverse aperture, which greatly facilitates heat conduction and dissipation.

[0010] Preferably, the fluid guide channel is configured to receive cleaning fluid. The cleaning fluid is preferably introduced into the motor at the end of the first motor.

[0011] The motor may include a fluid port extending into the motor housing at a first motor end. The fluid guiding structure may include a funnel-shaped outlet opening facing the rotor connected to the fluid port. Thus, fluid introduced through the fluid port can be optimally distributed within the motor via the funnel-shaped outlet opening.

[0012] The rotor may include a rotor housing and a magnet. The rotor housing may include a rotor sleeve. The rotor housing may include a first shaft extension disposed at a first end of the rotor sleeve, and may include a second shaft extension disposed at a second end of the rotor sleeve. The magnet may be fixed inside the rotor sleeve. The rotor housing is preferably liquid-tight to prevent any fluid or cleaning fluid from contacting the magnet, thereby preventing magnet corrosion.

[0013] The first shaft extension may include a first tapered portion facing the end of the first motor. The first tapered portion may be at least partially located within the funnel-shaped outlet opening. This allows for optimal guidance of the fluid as it flows out of the funnel-shaped outlet opening.

[0014] The output shaft can be attached to the second shaft extension. The output shaft may include an output shaft opening that extends at least partially along the axial extension of the output shaft. The output 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 output shaft is preferably integrally formed with the second shaft extension. Therefore, rotation of the rotor can be transmitted to the output shaft and the flexible shaft connected to the torque transmission element.

[0015] The fluid guiding structure can be connected to the output shaft opening. Preferably, at least one transverse hole communicates with the output shaft opening. The at least one transverse hole preferably connects the fluid guiding gap to the output shaft opening. Thus, fluid flowing along the fluid guiding gap is guided to the output shaft opening.

[0016] The second shaft extension may include a cylindrical groove facing the magnet. Preferably, the cylindrical groove is a drilled hole. A plug may be disposed within the groove. The plug preferably includes a cylindrical plug base body and a protrusion extending axially from the plug base body toward the magnet. The groove is preferably filled with potting material. Preferably, the cylindrical groove is connected to the output shaft opening. The cylindrical groove provided as a drilled hole is easy to manufacture, and the plug can seal the interior of the rotor housing to prevent fluid ingress. Preferably, the plug and the cylindrical groove are press-fitted. This prevents potting material from entering the output shaft opening when the cylindrical groove is filled with potting material. The protrusion facilitates plug assembly and also reinforces the potting material contained within the cylindrical groove, keeping the plug in place.

[0017] The motor may include a first bearing assembly. The rotor housing may be supported by the first bearing assembly, making it rotatable relative to the stator about a rotational axis. The first bearing assembly may be preloaded by an offset member. This allows the bearing to be preloaded with the necessary force and also allows only axial movement to compensate for manufacturing tolerances and minor deviations caused by heating during use.

[0018] A first spacer may be disposed between the biasing member and the first bearing member. The first spacer is preferably made of a plastic material, preferably a thermoplastic material, such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), etc. The spacer prevents the biasing member from tilting or tipping over. Furthermore, the aforementioned materials possess excellent mechanical and chemical resistance that remains even at high temperatures.

[0019] The biasing component can be a single wave spring or a stack of wave springs, or a single Belleville washer or a stack of disc washers, or a single wave spring washer or a stack of wave spring washers, or a Smalley washer.

[0020] The rotor housing can be supported by a second bearing member. The second bearing member can be fixed to the motor housing. A second spacer can abut against the second bearing member in the axial direction. The second spacer is preferably made of a plastic material, preferably a thermoplastic material, such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), etc. This provides optimal support for the rotor housing relative to the motor housing.

[0021] The first shaft extension may include a second tapered portion. The second tapered portion is preferably spaced apart from the first tapered portion. One of a first bearing member or a second bearing member may be disposed between the first and second tapered portions. Preferably, the fluid guiding gap is adjacent to the second tapered portion. Therefore, the first tapered portion can achieve fluid guidance along or through the bearing member, while the second tapered portion can achieve optimal guidance toward the fluid guiding gap. As the annular region gradually narrows toward the fluid guiding gap, the fluid velocity in the fluid guiding gap increases.

[0022] According to a second aspect of the invention, a motor assembly includes the motor as described above. The motor assembly may include a connector. The connector may be attached to a second motor end. The connector may include a central through-hole extending through the connector. An output shaft may be at least partially disposed within the central through-hole of the connector. The motor assembly may include a flexible shaft. The flexible shaft may be received within the central through-hole of the connector and may be torque-transmittingly coupled to the output shaft. Preferably, a sealing member is disposed between the connector and the motor housing. The connector is preferably screwed to the second motor end of the motor housing.

[0023] The motor assembly may include a conduit, and the central through-hole of the connector may include a conduit attachment portion. The conduit attachment component may be secured to the conduit attachment portion. A flexible shaft may extend through the conduit. Preferably, the conduit attachment component is glued to the conduit attachment portion. The connector may include at least one glue delivery opening extending from the peripheral surface of the connector into the conduit attachment portion. This facilitates the assembly and attachment of the conduit to the motor.

[0024] According to a third aspect of the invention, a blood pump includes a motor as described above or a motor assembly as described above.

[0025] The blood pump may include a pump section. The pump section may include a compressible and expandable housing and a compressible and expandable rotor disposed within the compressible and expandable housing. Preferably, the compressible and expandable housing has a diameter of up to 11 French in the compressed state. Even more preferably, the compressible and expandable housing has a diameter of up to 9 French in the compressed state. Attached Figure Description

[0026] The foregoing summary of the invention and the following detailed description of preferred embodiments will be more readily understood when read in conjunction with the accompanying drawings. For the purposes of illustrating this disclosure, reference is made to the accompanying drawings. The drawings are not drawn to scale. In the drawings, the same or corresponding parts shown in various figures are indicated by the same reference numerals. For clarity, not all parts are labeled in every figure. The scope of this disclosure is not limited to the specific embodiments disclosed in the accompanying drawings.

[0027] In the attached diagram: Figure 1 This is a schematic diagram of an intravascular blood pump located in the left ventricle of the heart.

[0028] Figure 2 yes Figure 1 A schematic diagram of the pump part of a blood pump.

[0029] Figure 3 This is a cross-sectional view of a motor for driving a blood pump according to the first embodiment.

[0030] Figure 4 yes Figure 3 A detailed schematic diagram of the first side of the bearing component of the motor.

[0031] Figure 5 yes Figure 4 A detailed schematic diagram of the second side of the bearing component.

[0032] Figure 6 This is a detailed schematic diagram of a motor assembly including the motor according to the first embodiment.

[0033] Figure 7 This is a cross-sectional view of the motor according to the second embodiment.

[0034] Figure 8 This is a cross-sectional view of the motor according to the third embodiment.

[0035] Figure 9 This is a cross-sectional view of the motor according to the fourth embodiment. Detailed Implementation

[0036] Figure 1An application of a blood pump to support a patient's heart H is illustrated. In this example, the blood pump is an intravascular blood pump 10. In this particular example, the intravascular blood pump 10 supports the left ventricle LV of the patient's heart H. As shown, the intravascular blood pump 10 includes a catheter 12 and a pump portion 14 installed in the distal region of the catheter 12.

[0037] The intravascular blood pump 10 can be inserted into the heart using percutaneous or transluminal techniques. For example, the intravascular blood pump 10 can be introduced via the femoral artery. However, other vascular access routes are also feasible, such as access via the subclavian or axillary arteries. After passing through the femoral artery, the catheter 12 can be pushed into the aorta, allowing the pump portion 14 to pass through the aortic valve and reach the patient's heart H. Figure 1 The position of the pump section 14 in the diagram is merely an example; other different placements are possible, such as placing the pump section 14 in the right ventricle of the patient's heart H.

[0038] The catheter 12 houses a flexible shaft 22 driven by a motor 60, which is preferably placed outside the patient's body, as will be described in more detail below. The flexible shaft 22 drives a pump element 16 disposed within a pump section 14. At its distal end, the pump section 14 includes a flexible atraumatic tip 24 having a pigtail or J-shape, which facilitates the placement of an intravascular blood pump 10 by assisting navigation within the patient's vascular system. Furthermore, the flexibility of the flexible atraumatic tip 24 allows the pump section 14 to be supported non-invasively against the wall of the left ventricle (LV).

[0039] like Figure 2 As shown, pump element 16 is disposed within pump housing 26. Pump housing 26 is composed of a series of supports 28. Pump element 16 is in the form of an impeller having at least one blade 54. Impeller 16 rotates about a central axis, causing blood to flow from blood inlet 18 at the distal end of pump housing 14 to blood outlet 20 located proximal to blood inlet 18. Pump housing 26 includes an inner coating 30 and an outer coating 32 surrounding the supports 28, the coatings extending a fixed distance 34 from blood inlet 18 toward blood outlet 20. Coatings 30, 32 are made of a suitable coating material (such as polyurethane).

[0040] The outflow tube 36 is connected to the outer coating 32 and covers and surrounds the blood outlet 20. The outflow tube 36 is foldable and made of a suitable biocompatible material, such as a suitable polymer, like polyurethane, polyamide, nylon, or silicone. Preferably, the outflow tube 36 is made of polyurethane (PU) or polytetrafluoroethylene (PTFE). Of course, the outflow tube 36 can also be made of other suitable materials, such as polyethylene terephthalate (PET) or polyamide. Figure 1 As shown, the outflow tube 36 includes an outflow opening 52. Here, the outflow opening 52 is located in the aorta. Blood flowing from the blood outlet 20 flows along the interior of the outflow tube 36 and is delivered to the aorta through the outflow opening 52.

[0041] Impeller 16 is offset from blood inlet 18 by a predetermined distance 38. Impeller 16 is typically positioned such that its leading edge 40 is surrounded by coatings 30, 32. The trailing edge 42 of impeller 16 may also be surrounded by coatings, or may extend beyond the rear end of the coatings. However, if impeller 16 extends beyond the coatings, at least a portion 46 of the overall length 44 of impeller 16 is surrounded by coatings 30, 32.

[0042] like Figure 2 As shown, the pump section 14 also includes a mesh structure 48. The opening defined by the mesh structure 48 is smaller than the opening defined by the support 28 forming the housing. The mesh structure 48 is directly coupled to the support 28 or the outer coating 32 forming the pump section housing 26. In some embodiments, the mesh structure 48 may be directly coupled to one or more supports 50 upstream (in the blood flow direction) of the support 28 forming the pump section housing 26. In some embodiments, the mesh structure 48 may not be directly coupled to any of the supports 28, 50. The mesh structure 48 is positioned upstream of the impeller 16. In some embodiments, the mesh structure 48 may be positioned within the internal space defined by the supports 28, 50. In some embodiments, the mesh structure 48 may be positioned outside the supports 28, 50. The supports 28, 50 are made of a suitable material, such as a nickel-titanium alloy.

[0043] In this embodiment, both the impeller 16 and the pump housing 26 are compressible and expandable. To insert the blood pump 10, the pump portion 14 advances through the patient's vascular system while the impeller 16, pump housing 26, and outflow tube 36 are compressed. Once the pump portion 14 reaches its target position, the pump housing 26 and impeller 16 expand. As blood flow is established, the outflow tube 36 also expands.

[0044] Figure 3 A cross-sectional side view of a first embodiment of a motor 60 is shown. The motor 60 is a brushless motor and is configured to drive a flexible shaft 22, thereby driving an impeller 16. The motor 60 includes 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 passage 72 extends within the motor 60 between the first motor end 68 and the second motor end 70, as will be described in more detail below. Specifically, the motor housing 62 is configured such that fluid can flow through the motor housing 62 in a fluid guide gap 74. As shown, the fluid guide gap 74 is an annular gap between the stator 64 and the rotor 66. Therefore, the fluid guide gap 74 is part of the fluid passage 72. The stator 64 is disposed within a fluid-sealed stator chamber 76. The guide gap 74 extends substantially along the axial direction of the stator 64, i.e., along the entire length of the stator 64 in the axial direction, and has a constant height.

[0045] The stator chamber 76 is defined by the inner sleeve 80 along the direction of the rotor 66, i.e., in the radial direction. The rotor 66 is disposed within the inner sleeve 80. Specifically, the rotor 66 includes a rotor housing 82 and a magnet 84 disposed within the rotor housing 82. Therefore, the rotor 66 is also configured to be fluid-tight and is disposed within a rotor chamber 78, which is filled with fluid, especially a cleaning fluid, during operation, as will be described in more detail below.

[0046] The rotor 66 is supported by rotor bearing components (i.e., proximal bearing component 86 and distal bearing component 88). In this embodiment, the proximal bearing component 86 is a first bearing component, and the distal bearing component 88 is a second bearing component.

[0047] The rotor 66 rotates about a rotation axis RA, which extends axially through the center of the motor housing 62. The rotor bearing components 86 and 88 are constructed as ball bearings with a cage 192 made of polyetheretherketone (PEEK), see also... Figure 4 and Figure 5 The outer bearing races 194 of bearing components 86 and 88 are supported on the inner circumferential surface 90 of the inner sleeve 80. A sliding fit is formed between the bearing components 86 and 88 and the inner sleeve 80. Fluid flowing in the fluid guiding gap 74 between the rotor 66 and the stator 64 can flow through the bearing components 86 and 88.

[0048] like Figure 4 and Figure 5As shown, the cage 192 of each bearing assembly 86, 88 is a single, integral structure, comprising a largely open first side 198 and a largely closed second side 200. Therefore, the cage 192 of each bearing assembly 86, 88 is configured as a quick-release cage, which secures the rolling assembly 202 via a quick-release engagement. When installed, the first side 198 of each bearing assembly 86, 88 faces the first motor end 68. This allows fluid flowing along the fluid guide gap 74 to pass more easily through the bearing assemblies 86, 88.

[0049] The inner sleeve 80 is integrally molded from polyetheretherketone (PEEK) and defines the rotor chamber 78 radially. In this particular embodiment, the inner sleeve 80 defines the entire space within the motor housing 62 through which fluid can flow axially. At least within the axially extending region of the stator 64, the inner sleeve 80 has an annular cylindrical portion with a constant wall thickness, preferably about 0.5 mm. As shown, the annular cylindrical portion is a hollow structure. The motor housing 62 also includes an outer sleeve 92, which also defines the stator chamber 76 radially. The outer sleeve 92 is preferably made of corrosion-resistant steel and has a wall thickness of about 0.5 mm.

[0050] 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 fitted and (e.g., by laser welding) secured to the motor flange 94. The motor flange 94 includes external threads 156 on its outer circumferential surface. The inner sleeve 80 includes a flange portion 96 extending into the motor flange 94 at the second motor end 70. Preferably, the flange portion 96 is pressed into the motor flange 94. The flange portion 96 extends in a central recess 98 within the motor flange 94. Figure 3 As shown, the inner sleeve 80 extends to the end of the motor flange 94 and is flush with the motor flange 94.

[0051] The inner sleeve 80 abuts against the motor flange 94 via an annular extension 100 in the axial direction of the rotation axis RA. Within the stator chamber 76, the stator 64 is disposed on the other side of the annular extension 100. The wall thickness of the inner sleeve 80 in the region of the flange portion 96 is at least twice the wall thickness in the region of the fluid guiding gap 74 between the stator 64 and the rotor 66. Furthermore, the flange portion 96 includes a reduced-diameter portion 102, which provides a mounting edge 104 within the flange portion 96 for receiving a distal spacer 124. The distal spacer 124 is a tubular member, and in this embodiment, is a second spacer. Figure 3 As shown, the second spacer 124 abuts against the mounting edge 104 on one side and against the second bearing member 88 on the other side, so that the second bearing member 88 is supported in the axial direction.

[0052] At the first motor end 68 of the motor 60 or motor housing 62, a centering flange 106 is located between the outer circumferential surface of the inner sleeve 80 and the inner circumferential surface of the outer sleeve 92. The centering flange 106 spaces the inner sleeve 80 and the outer sleeve 92 apart from each other. The centering flange 106 also restricts the stator chamber 76 in the axial direction. For example, the stator chamber 76 is completely filled with a first potting material 108. Preferably, the first potting material 108 has a viscosity of up to 200 cPs in its uncured state. Therefore, air accumulation can be greatly avoided during the application of the first potting material 108.

[0053] At the first motor end 68, the motor housing 62 or the motor 60 is completely sealed with a second potting material 110. The second potting material 110 is substantially flush with the outer sleeve 92 in the axial direction. The inner sleeve 80 protrudes inward into the second potting material 110 and terminates within it. An electrical connection 112 and a fluid connector 114 extend through the second potting material 110 into the motor housing 62. The fluid connector 114 has a connection profile 116 on its outer circumferential surface, for example, for a hose. Furthermore, the fluid connector 114 includes a fluid port 118 for introducing fluid flowing along the fluid channel 72 and within the fluid guide gap 74.

[0054] Furthermore, the fluid connector 114 includes a recessed portion 119 on its outer circumferential surface, which provides a form fit within the second potting material 110. This prevents the fluid connector 114 from moving relative to the motor housing 62 and the second potting material 110 when forces are applied to the fluid connector 114 (e.g., attaching or detaching a hose). In the illustrated embodiment, the recessed portion 119 is completely surrounding the connector. However, the recessed portion 119 may also have other configurations, such as being partially surrounding the connector or in the form of a slot or recess.

[0055] The fluid to be introduced is preferably a cleaning medium or cleaning fluid, such as glucose solution or physiological saline. Figure 3 As shown, the fluid connector 114 includes a large-diameter portion that is fitted into the inner sleeve 80, i.e., the large-diameter portion of the fluid connector 114 contacts the inner circumferential surface 90 of the inner sleeve 80. Preferably, the large-diameter portion of the fluid connector 114 forms a sliding fit with the inner sleeve 80.

[0056] A biasing member 120 in the form of a single-wave spring and a proximal first spacer 122 are disposed between the fluid connector 114 and the first bearing member 86. In this embodiment, the proximal spacer 122 is the first spacer. As shown, the first spacer 122 is disposed between the biasing member 120 and the first bearing member 86. The first biasing member 120 applies preload to the first bearing member 86 in a direction toward the second motor end 70. The first spacer 122 prevents the biasing member 120 from tilting and thus prevents the first biasing member 120 from penetrating into the first bearing member 86. Since the bearing members 86, 88 and the inner circumferential surface 90 of the inner sleeve 80 are in sliding fit, the bearing members 86, 88 can be biased against each other by the biasing force of the biasing member 120. The first spacer 122 is made of a suitable biocompatible material, particularly a plastic material, preferably a thermoplastic material such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), etc.

[0057] The rotor housing 82 includes 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 along the direction of the first motor end 68, while the second shaft extension 130 is attached to the rotor sleeve 126 along the direction of the second motor end 70. The rotor sleeve 126 is connected to the shaft extensions 128 and 130 by a fluid-sealed method (e.g., by welding, particularly laser welding).

[0058] The first shaft extension 128 extends at least partially into the rotor sleeve 126 and is supported by the first bearing member 86, particularly by the inner race 196 of the first bearing member 86. The first shaft extension 128 includes a first tapered portion 166 at its end facing the first motor end 68. Furthermore, the first shaft extension 128 also includes a second tapered portion 168 disposed between the first bearing member 86 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 member 88, particularly by the inner race 196 of the second bearing member 88. Furthermore, an output shaft 132 is coupled to the second shaft extension 130. Specifically, the output shaft 132 is integrally formed with the second shaft extension 130 and protrudes from the motor housing 62 at the second motor end 70. The output shaft 132 includes an output shaft opening 134 and a cylindrical recess 136 connected to the output shaft opening 134. The output shaft opening 134 is configured to accommodate the flexible shaft 22 in a torque transmission manner; see also Figure 4 Therefore, the output shaft opening 134 includes a torque transmission element 138 with an internal profile. In this embodiment, the internal profile is a square profile.

[0059] In addition, the first shaft extension 128 and the second shaft extension 130 can also be used to balance the rotor 66 when removing material from the rotor 66.

[0060] The cylindrical recess 136 faces the magnet 84 and is positioned for manufacturing considerations. The cylindrical recess 136 is closed by a plug 140, which prevents fluid from entering the rotor 66. The plug 140 includes a cylindrical base body 142 and a protrusion 144 extending axially from the cylindrical base body 142 toward the magnet 84. The cylindrical base body 142 is press-fitted into the cylindrical recess 136. The cylindrical recess 136 is filled with a third potting material 146, wherein the protrusion 144 simplifies the assembly of the plug 140 and also serves as a reinforcing structure for the third potting material 146.

[0061] The biasing member 120 applies a biasing force to the rotor 66 in the direction toward the second motor end 70, so that the rotor 66 is supported on the mounting edge 104 at the second motor end 70 via the second bearing member 88 and the second spacer 124.

[0062] The stator 64 has a return yoke 148 having a plurality of individual laminations extending side-by-side in the stator chamber 76. The stator 64 also includes a coil assembly 150 having, for example, three pairs of coils. The coil assembly 150 extends from an annular extension 100 to a platinum carrier 152 disposed on the outer circumferential surface of the inner sleeve 80. The platinum carrier 152 has an annular shape and supports an annular circuit board 154. The circuit board 154 is connected to an electrical connector 112 and is configured for electrical interconnections for operating the motor 60 in a known manner.

[0063] The fluid guiding channel 72 also includes a fluid guiding structure 160 for optimally guiding fluid introduced from the fluid port 118. The fluid guiding structure 160 includes at least one lateral aperture 162 extending through the output shaft 132, specifically into the output shaft opening 134. Figure 3 As shown, the fluid guiding structure 160 includes a plurality of transverse holes 162 evenly distributed on the circumference of the output shaft 132. The transverse holes 162 are disposed between the fluid guiding gap 74 and the second bearing member 88. The fluid guiding structure 160 also includes a funnel-shaped outlet opening 164 disposed in the fluid connector 114 directly adjacent to the fluid port 118. The first tapered portion 166 of the first shaft extension 128 is partially disposed within the funnel-shaped outlet opening 164.

[0064] Fluid entering the motor housing 62 through fluid port 118 flows along a funnel-shaped outlet opening 164, which engages with a first tapered portion 166 of the first shaft extension 128 to guide the fluid to the first bearing member 86. After passing through the first bearing member 86, the fluid is guided via a second tapered portion 168 of the first shaft extension 128 to a fluid guide gap 74. The fluid guide gap 74 between the rotor 66 and the stator 64 is sized such that it has a height of at least approximately 0.5 mm along the axial extension of the rotor sleeve 126. This height of the fluid guide gap 74 has proven particularly advantageous for improving the efficiency of the motor 60. After exiting the fluid guide gap 74, a portion of the fluid enters the output shaft 132 through the transverse bore 162 to enter the output shaft opening 134. The fluid also flows partially through the second bearing member 88 and then further along the outer circumferential surface of the output shaft 132 toward the second motor end 70. This configuration has proven to be most efficient in terms of heat conduction and also effectively cleans the output shaft opening 134. To assemble the motor 60, the outer sleeve 92 is first attached to and welded to the motor flange 94, and then the inner sleeve 80 with the flange portion 96 is pressed into the central groove 98 of the motor flange 94. The annular space formed between the outer sleeve 92 and the inner sleeve 80 (i.e., the stator chamber 76) is then filled with a first potting material 108, preferably having a maximum viscosity of 200 cPs in its uncured state. The coil assembly 150 and the return yoke 148 are inserted into the still liquid first potting material 108. Next, the platinum carrier 152, the circuit board 154, and the centering flange 106 are installed. After inserting the centering flange 106, any cavities that may exist in the stator chamber 76 are filled with the first potting material 108. Subsequently, the second spacer 124 and the second bearing member 88 are inserted together with the pre-assembled rotor 66 containing the first bearing member 86 into the rotor chamber 78, such that the second spacer 124 abuts against the mounting edge 104.

[0065] Subsequently, the biasing member 120 and the first spacer 122 are installed together with the fluid connector 114 into the inner sleeve 80. A predetermined force is then applied to the fluid connector 114. Finally, a second potting material 110 is provided at the first motor end 68, and the force applied to the fluid connector 114 is maintained until the second potting material 110 is fully cured. Preferably, the pre-assembly of the stator 64 includes the insertion of the centering flange 106 and the curing of the first potting material 108, and the pre-assembly of the rotor 66 can be performed outside a cleanroom. Specifically, to prevent debris generated during the balancing process from adhering to the rotor 66, the rotor is preferably magnetized after balancing. Assembling the rotor 66 into the stator 64, including the application and curing of the second potting material 110, is preferably performed inside a cleanroom.

[0066] Figure 6 Motor assembly 170 is schematically shown, comprising motor 60 as described above. Motor assembly 170 includes connector 172 attached to second motor end 70. Specifically, connector 172 includes internal thread 174 screwed onto external thread 156 of motor flange 94. Sealing member 176 is disposed between second motor end 70 and connector 172 to prevent fluid from flowing out of motor assembly 170 in the area of ​​threads 156, 174. Sealing member 176 is an annular member disposed at second motor end 70, i.e., at the end face of motor flange 94.

[0067] Connector 172 includes a central through-hole 178 extending through it. As shown, the central through-hole 178 includes a first opening 180 and a second opening 182 connected by a central opening 184. The diameter of the first opening 180 is larger than the diameter of the second opening 182. The diameter of the second opening 182 is larger than the diameter of the central opening 184. Output shaft 132 is partially disposed within the first opening 180. The second opening 182 includes a conduit attachment portion 186 and a plurality of adhesive transfer openings 188 extending from the outer circumferential surface of connector 172 into the conduit attachment portion 186.

[0068] like Figure 6 As shown, the motor assembly 170 includes a conduit 12 and a flexible shaft 22. An attachment member 190 of the conduit 12 is disposed within a conduit attachment portion 186 and fixed thereto by adhesive. Adhesive for fixing the attachment member 190 of the conduit 12 to the conduit attachment portion 186 is applied via an adhesive transfer opening 188. As shown, the attachment member 190 of the conduit 12 abuts against an end of a second opening portion 182, which defines the boundary between the second opening portion 182 and the intermediate opening portion 184.

[0069] The flexible shaft 22 extends within the conduit 12 and enters the output shaft opening 134 of the output shaft 132 through the intermediate opening portion 184. The end of the flexible shaft 22 is received within the output shaft opening 134 in a sliding fit manner and operates in a torque-transmitting manner; that is, the end of the flexible shaft 22 matches the internal contour of the output shaft opening 134, for example, it is configured as a square plug. However, a certain gap is required between the end of the flexible shaft 22 and the inner circumferential surface of the output shaft opening 134 to allow fluid to pass through and to allow axial movement of the end of the flexible shaft 22 within the output shaft opening 134. This axial movement prevents the flexible shaft 22 from being subjected to axial loads during use. The gap can be achieved, for example, by slightly reducing the size of the end of the flexible shaft 22 or the groove.

[0070] The fluid flowing out from the output shaft opening 134 merges again with the fluid flowing along the outer circumferential surface of the output shaft 132 and enters the conduit 12 through the intermediate opening portion 184. Since the fluid is preferably a cleaning fluid, it also serves to prevent thrombosis within the pump portion 14.

[0071] Figure 7 The motor 260 of the second embodiment is depicted. The motor 260 according to the second embodiment differs from the motor 60 according to the first embodiment in the construction of the proximal spacer 222, the distal spacer 224, and the biasing member 220. In this embodiment, the distal spacer 224 is the first spacer described herein, and the proximal spacer 222 is the second spacer described herein. Therefore, the distal bearing member 88 is the first bearing member described herein, and the proximal bearing member 86 is the second bearing member described herein. The biasing member 220 is in the form of a wave spring.

[0072] like Figure 7 As shown, the biasing member 220 is supported on the tubular portion of the first spacer 224 and abuts against the mounting edge 104 to apply preload to the first bearing member 88 via the first spacer 224. The first spacer 224 also includes a third tapered portion 266 that tapers gradually toward the outer circumferential surface of the output shaft 132, guiding fluid flowing through the first bearing member 88 in this direction. To improve fluid distribution, particularly in the region where the biasing member 220 is located, one or more axial grooves 280 and / or channels 282 may be provided on the outer surface of the first spacer 224 to provide fluid to the region where the biasing member 220 is located. Figure 7 In the diagram, the axial groove 280 and the channel 282 are indicated by dashed lines. Of course, the channel 282 can have different constructions, and it is also possible to have only the axial groove 280 or only the channel 282.

[0073] The second spacer 222 is directly disposed between the fluid connector 114 and the second bearing member 86. The first spacer 224 and the second spacer 222 are made of biocompatible materials, preferably plastic materials, more preferably thermoplastic materials, such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), etc.

[0074] Figure 8A motor 360 according to a third embodiment is depicted. The motor 360 according to the third embodiment differs from the motor 60 according to the first embodiment in the construction of the proximal spacer 322, the distal spacer 324, and the biasing member 320. In this embodiment, the distal spacer 324 is the first spacer described herein, and the proximal spacer 322 is the second spacer described herein. Therefore, the distal bearing member 88 is the first bearing member described herein, and the proximal bearing member 86 is the second bearing member described herein. The biasing member 320 is in the form of a set of wave springs.

[0075] like Figure 8 As shown, the biasing member 320 is supported on the tubular portion of the first spacer 324 and abuts against the mounting edge 104 to apply preload to the first bearing member 88 via the first spacer 324. To improve fluid distribution, particularly in the region where the biasing member 320 is located, one or more axial grooves 380 and / or channels 382 may be provided on the outer surface of the first spacer 324 to provide fluid to the region where the biasing member 320 is located. Figure 8 In the diagram, the axial groove 380 and the channel 382 are indicated by dashed lines. Of course, the channel 382 can have different constructions, and it is also possible to have only the axial groove 380 or only the channel 382.

[0076] The second spacer 322 is directly disposed between the fluid connector 114 and the second bearing member 86. The first spacer 324 and the second spacer 322 are made of biocompatible materials, preferably plastic materials, more preferably thermoplastic materials, such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), etc.

[0077] Figure 9 Motor 460 according to the fourth embodiment is depicted. Motor 460 according to the fourth embodiment differs from motor 60 according to the first embodiment in the construction of fluid connector 414. In this embodiment, proximal bearing member 86 is the first bearing member described herein, while distal bearing member 88 is the second bearing member described herein. The biasing member 420 is in the form of a set of wave springs.

[0078] The fluid connector 414 is shortened to form a biasing member receiving space 430 between the first bearing member 86 and the fluid connector 414. A biasing member 420 is disposed within the biasing member receiving space 430 to apply preload to the first bearing member 88. In this embodiment, a first spacer is not provided, but it may be provided if necessary.

[0079] Exemplary Implementation As previously stated, the techniques described herein can be implemented in a variety of ways. In this regard, the foregoing disclosure is intended to cover, but is not limited to, the systems, methods, and combinations and sub-combinations thereof in the following exemplary embodiments. Preferred embodiments will be described in the following paragraphs.

[0080] A1 A motor for a blood pump, the motor having a first motor end and a second motor end, and comprising: a motor housing, a stator disposed within the motor housing, a rotor disposed within the motor housing, a fluid passage extending within the motor between the first motor end and the second motor end, and an output shaft connected to the rotor; wherein the rotor is rotatable about a rotation axis extending in an axial direction; wherein a portion of the fluid passage is disposed radially relative to the rotation axis between the stator and the rotor, forming a fluid guiding gap; and wherein the fluid passage includes a fluid guiding structure (160).

[0081] A2 of the motor according to A1, wherein the fluid guiding structure includes at least one transverse hole extending at least partially through the output shaft.

[0082] A3 is a motor according to A1 or A2, wherein the motor includes a fluid port at a first motor end that extends into the motor housing, wherein the fluid guiding structure includes a funnel-shaped outlet opening toward the rotor connected to the fluid port.

[0083] A4 The motor according to any one of A1 to A3 above, wherein the rotor includes a rotor housing and a magnet, wherein the rotor housing includes a rotor sleeve, a first shaft extension disposed at a first end of the rotor sleeve and a second shaft extension disposed at a second end of the rotor sleeve, wherein the magnet is fixed inside the rotor sleeve.

[0084] A5 is the motor according to A4, wherein the first shaft extension includes a first tapered portion facing the end of the first motor.

[0085] A6 is a motor according to A4 or A5, wherein the output shaft is attached to a second shaft extension.

[0086] A7 The motor according to any one of A1 to A6 above, wherein the output shaft includes an output shaft opening that extends at least partially along an axial extension of the output shaft.

[0087] A8 is the motor according to A7, wherein the output shaft opening includes a torque transmission element.

[0088] A9 is the motor described in A8, wherein the torque transmission element has an internal profile.

[0089] A10 is the motor described in A9, wherein the internal profile is a square plug.

[0090] A11 is a motor according to any one of A4 to A10 above, wherein the output shaft and the second shaft extension are integrally formed.

[0091] A12 is a motor according to any one of A7 to A11 above, wherein the fluid guiding structure is connected to the output shaft opening.

[0092] A13 The motor according to any one of A7 to A12 above, wherein at least one transverse hole communicates with the output shaft opening.

[0093] A14 The motor according to any one of A4 to A13 above, wherein the second shaft extension includes a cylindrical groove facing the magnet.

[0094] A15 is the motor according to A14, wherein a plug is provided in the groove.

[0095] A16 The motor according to A15, wherein the plug includes a cylindrical plug base body and a protrusion extending axially from the plug base body toward the magnet.

[0096] A17 is a motor according to any one of A14 to A16 above, wherein the groove is filled with potting material.

[0097] A18 is a motor according to any one of A14 to A17 above, wherein the cylindrical groove is a drilled hole.

[0098] A19 The motor according to any one of A4 to A18 above, wherein the motor includes a first bearing member, wherein the rotor housing is supported by the first bearing member so that it can rotate relative to the stator about a rotation axis, wherein the first bearing member is preloaded by an offset member.

[0099] A20 is the motor according to A19, wherein a first spacer is provided between the biasing member and the first bearing member.

[0100] A21 The motor according to A20, wherein the first spacer is made of a biocompatible material, preferably a plastic material, more preferably a thermoplastic material, such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), etc.

[0101] A22 The motor according to any one of A19 to A21, wherein the biasing member is a single wave spring or a group of wave springs, or a single disc spring or a group of disc springs, or a single wave spring washer or a group of wave spring washers, or a Smalley washer.

[0102] A23 is a motor according to any one of A4 to A22 above, wherein the rotor housing is supported by a second bearing member.

[0103] A24 is the motor according to A23, wherein the second bearing component is fixed to the motor housing.

[0104] A25 is a motor according to A23 or A24, wherein the second spacer abuts against the second bearing member in the axial direction.

[0105] A26 The motor according to A25, wherein the second spacer is made of a biocompatible material, preferably a plastic material, more preferably a thermoplastic material, such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), etc.

[0106] A27 The motor according to any one of A5 to A26 above, wherein the first shaft extension includes a second tapered portion that abuts the fluid guide gap.

[0107] A28 The motor according to A27, wherein a first bearing member or a second bearing member is disposed between a first tapered portion and a second tapered portion.

[0108] A29 The motor according to any one of A1 to A28 above, wherein the motor includes an inner sleeve disposed between the rotor and the stator.

[0109] A30 is the motor according to A29, wherein the first bearing component is supported at the inner sleeve.

[0110] A31 is the motor described in A29 or A30, wherein the second bearing member is supported at the inner sleeve.

[0111] A32 The motor according to any one of A29 to A31 above, wherein the inner sleeve is made of a biocompatible material, preferably a plastic material, more preferably a thermoplastic material, such as polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polytetrafluoroethylene (PTFE), polyethylene (PE), etc.

[0112] A33 is a motor according to any one of A29 to A32 above, wherein the inner sleeve has a wall thickness of up to 0.5 mm in the region of the axial extension of the stator.

[0113] A34 The motor according to any one of A29 to A33 above, wherein the fluid guide gap is formed between the inner sleeve and the rotor housing.

[0114] A36 is a motor according to any one of A1 to A34 above, wherein the fluid guide gap has an annular shape.

[0115] A35 is the motor described in A36, wherein the height of the fluid guide gap is approximately 0.5 mm.

[0116] A36 is a motor according to any one of A20 to A35 above, wherein the first spacer includes a third tapered portion.

[0117] A37 The motor according to any one of A19 to A36 above, wherein the first bearing member includes a first cage, wherein the first cage is configured as a first quick-release cage.

[0118] A38 is the motor according to A37, wherein the first quick-release cage includes an open side and a closed side, wherein the open side faces the end of the first motor.

[0119] A39 The motor according to any one of A20 to A38 above, wherein the second bearing member includes a second cage, wherein the second cage is configured as a second quick-release cage.

[0120] A40 is the motor according to A39, wherein the second quick-release cage includes an open side and a closed side, wherein the open side faces the end of the first motor.

[0121] A41 is a motor according to any one of A20 to A40 above, wherein the first spacer includes at least one channel and / or at least one axial groove.

[0122] A42 is a motor according to any one of A25 to A41 above, wherein the second spacer includes at least one channel and / or at least one axial groove.

[0123] A42 is a motor according to any one of A1 to A42 above, wherein the stator is disposed in a stator cavity, wherein the stator cavity is filled with potting material.

[0124] A43 is the motor according to A42, wherein the potting material in the stator cavity has a viscosity of up to 200 cPs in the uncured state.

[0125] A44 is a motor according to any one of A1 to A43 above, wherein a fluid connector is provided at the end of the first motor.

[0126] A45 is a motor according to any one of A1 to A44 above, wherein the motor housing is sealed with potting material at the first motor end.

[0127] A46 is the motor described in A45, wherein a fluid connector passes through a potting material sealing the end of the first motor.

[0128] A47, according to the motor described in A46, wherein the fluid connector includes a recessed portion on its outer circumferential surface that provides a form fit in the potting material sealing the end of the first motor.

[0129] B1 A motor assembly comprising a motor according to any one of A1 to A47 above, wherein the motor assembly includes a connector, wherein the connector is attached to a second motor end.

[0130] B2, according to the motor assembly of B1, wherein the connector includes a central through-hole extending through the connector.

[0131] B3, according to the motor assembly of B2, wherein the output shaft is at least partially disposed within the central through-hole of the connector.

[0132] B4 is a motor assembly according to B2 or B3, wherein the motor assembly includes a flexible shaft, wherein the flexible shaft is received within a central through-hole of the connector.

[0133] B5 is a motor assembly according to any one of B1 to B4 above, wherein the flexible shaft is connected to the output shaft in a torque transmission manner.

[0134] B6, according to the motor assembly of B5, wherein the flexible shaft includes an end portion whose outer contour matches the inner contour of the output shaft opening.

[0135] B7 is the motor assembly according to B6, wherein a gap is provided between the end of the flexible shaft and the inner circumferential surface of the output shaft opening.

[0136] B8 is a motor assembly according to any one of B1 to B7 above, wherein a sealing member is provided between the connector and the motor housing.

[0137] B9 is a motor assembly according to any one of B1 to B8 above, wherein the motor assembly includes a conduit.

[0138] B10, according to the motor assembly of B9, wherein the central through-hole of the connector includes a conduit attachment portion, wherein the conduit attachment component is fixed to the conduit attachment portion.

[0139] B11 is the motor assembly according to B10, wherein the attachment component of the conduit is glued to the conduit attachment portion.

[0140] B12, according to the motor assembly of B11, wherein the connector includes at least one adhesive delivery opening extending from the outer circumferential surface of the connector into the conduit attachment portion.

[0141] B13 is a motor assembly according to any one of B9 to B12 above, wherein a flexible shaft extends through a conduit.

[0142] B14 is a motor assembly according to any one of B1 to B13 above, wherein the connector is screwed to the motor.

[0143] C1 A blood pump comprising a motor according to any one of A1 to A36 above, or comprising a motor assembly according to any one of B1 to B14 above.

[0144] C2 is the blood pump described in C1, wherein the blood pump is an intravascular blood pump.

[0145] C3 is the blood pump described in C1 or C2, wherein the motor is an external motor.

[0146] C4 is a blood pump according to any one of C1 to C3 above, wherein the blood pump includes an implantable pump portion.

[0147] C5 is the blood pump described in C4, wherein the pump portion is compressible and deployable.

[0148] C6 is a blood pump according to C4 or C5, wherein the pump portion includes a pump portion housing.

[0149] C7 is the blood pump according to C6, wherein the pump housing is at least partially formed by a support.

[0150] C8 is a blood pump according to C6 or C7, wherein the pump housing is at least partially made of a nickel-titanium alloy.

[0151] C9 is a blood pump according to any one of C4 to C8 above, wherein a pump element is disposed within the pump housing.

[0152] C10 is the blood pump according to C9, wherein the pump element is compressible and deployable.

[0153] C11 is a blood pump according to any one of C6 to C10 above, wherein the pump portion includes an inner coating.

[0154] C12 is a blood pump according to any one of C1 to C11 above, wherein the pump portion includes an outer coating.

[0155] C13 The blood pump according to any one of C1 to C12 above, wherein the pump portion includes at least one blood outlet and an outflow tube connected to at least one blood outlet.

[0156] C14 is the blood pump according to C13, wherein the outflow tube is compressible and deployable.

[0157] C15 is a blood pump according to C13 or C14, wherein the outflow tube includes at least one outflow opening.

[0158] As used herein, the terms “about,” “approximately,” “substantially,” and similar terms are intended to have a broad meaning consistent with common and accepted usage by one of ordinary skill in the art to which this disclosure pertains. As used herein, “proximal” and “distal” are relative to a medical person or physician. Thus, when a blood pump is introduced into a patient, proximal refers to the portion closer to the physician, while distal refers to the portion farther from the physician. It should be understood by one of skill in the art that these terms are intended to allow for the description of certain features without limiting the scope of those features to the precise numerical ranges provided. Therefore, these terms should be interpreted as indicating minor or insignificant modifications or alterations to the described subject matter and are considered within the scope of this disclosure. The terms “at least partially” or “partially” as used herein mean part and all or completely, respectively. Terms such as “first,” “second,” or “third” do not indicate a specific order but are used merely to semantically distinguish the elements.

[0159] [List of Labels in the Attached Image] 10: Blood pump 12: Catheter 14: Pump Section 16: Pump components / impeller 18: Blood flow entry point 20: Blood Outlet 22: Flexible shaft 24: Non-invasive cutting-edge technology 26: Pump casing 28: Bracket 30: Inner coating 32: Outer coating 34: Fixed distance 36: Outflow tube 38: Pre-determined distance 40: Leading edge of the impeller 42: Trailing edge of the impeller 44: Impeller length 46: Partial length of the impeller 48: Network structure 50: Bracket 52: Outflow opening 54: Leaf 60: Motor 62: Motor housing 64: Stator 66: Rotor 68: End of the first motor 70: Second motor end 72: Fluid Channel 74: Fluid guiding gap 76: Stator Chamber 78: Rotor chamber 80: Inner sleeve 82: Rotor housing 84: Magnet 86: Proximal bearing component 88: Distant bearing component 90: Inner circumferential surface of the inner sleeve 92: Outer tube 94: Motor flange 96: Flange section 98: Center groove of motor flange 100: Annular extension 102: Reduced diameter section 104: Install edge 106: Centering flange 108: First potting material 110: Second potting material 112: Electrical connectors 114: Fluid Connector 116: Connect the contours 118: Fluid Port 119: Inward section 120: Offset component 122: Proximal spacer 124: Distant spacer 126: Rotor sleeve 128: First shaft extension 130: Second shaft extension 132: Output shaft 134: Output shaft opening 136: Cylindrical groove 138: Torque transmission element 140: Plug 142: The base body of the plug 144: The protrusion of the plug 146: Third potting material 148: Reflux yoke 150: Coil Assembly 152: Platinum support 154: Circuit Board 156: External thread 160: Fluid guiding structure 162: Horizontal hole 164: Funnel-shaped outlet opening 166: First conical section 168: Second conical section 170: Motor assembly 172: Connector 174: Internal thread 176: Sealing components 178: Central through-hole opening 180: First opening section 182: Second opening section 184: The middle opening section 186: Catheter attachment portion 188: Glue transfer opening 190: Catheter attachment components 220: Offset component 222: Proximal spacer 224: Distant spacer 260: Motor 266: Third cone-shaped part 280: Axial groove 282: Channel 320: Offset component 322: Proximal spacer 324: Remote spacer 360: Motor 380: Axial groove 382: Channel 414: Fluid Connector 420: Offset component 430: Offset component receiving space 460: Motor RA: Axis of rotation H: Heart LV: Left ventricle.

Claims

1. A motor (60, 260, 360, 460) for a blood pump (10), said motor (60, 260, 360, 460) having a first motor end (68) and a second motor end (70), and comprising: Motor housing (62); Stator (64), the stator (64) is disposed inside the motor housing (62); Rotor (66), the rotor (66) is disposed inside the motor housing (62); A fluid channel (72) extending within the motors (60, 260, 360, 460) between the first motor end (68) and the second motor end (70); and Output shaft (132), which is connected to rotor (66); The rotor (66) is rotatable about a rotation axis (RA) extending in the axial direction; A portion of the fluid channel (72) is disposed radially between the stator (64) and the rotor (66) relative to the axis of rotation (RA), forming a fluid guiding gap (74); and The fluid channel (72) includes a fluid guiding structure (160).

2. The motor (60, 260, 360, 460) according to claim 1, wherein, The fluid guiding structure (160) includes at least one transverse hole (162) extending at least partially through the output shaft (132).

3. The motor (60, 260, 360, 460) according to claim 1 or 2. in, The motors (60, 260, 360, 460) include a fluid port (118) at the end (68) of the first motor, the fluid port (118) extending into the motor housing (62), wherein the fluid guiding structure (160) includes a funnel-shaped outlet opening (164) connected to the fluid port (118) and facing the rotor (66).

4. The motor (60, 260, 360, 460) according to any one of the preceding claims. in, The rotor (66) includes a rotor housing (82) and a magnet (84), wherein the rotor housing (82) includes a rotor sleeve (126), a first shaft extension (128) disposed at a first end of the rotor sleeve (126) and a second shaft extension (130) disposed at a second end of the rotor sleeve (126), wherein the magnet (84) is fixed inside the rotor sleeve (126).

5. The motor (60, 260, 360, 460) according to claim 4. in, The first shaft extension (128) includes a first tapered portion (166) facing the first motor end (68).

6. The motor (60, 260, 360, 460) according to claim 4 or 5. in, The output shaft (132) is attached to the second shaft extension (130); wherein the output shaft (132) includes an output shaft opening (134) extending at least partially along an axial extension of the output shaft (132); wherein the output shaft opening (134) preferably includes a torque transmission element (138); wherein the torque transmission element (138) is preferably an internal profile; and wherein the output shaft (132) is preferably integrally formed with the second shaft extension (130).

7. The motor (60, 260, 360, 460) according to claim 6. in, The fluid guiding structure (160) is connected to the output shaft opening (134).

8. The motor (60, 260, 360, 460) according to claim 7, wherein, The at least one transverse hole (162) communicates with the output shaft opening (134).

9. The motor (60, 260, 360) according to any one of claims 4 to 8. in, The second axial extension (130) includes a cylindrical groove (136) facing the magnet (84), preferably a drilled hole; wherein a plug (140) is provided in the groove (136); wherein the plug (140) preferably includes a cylindrical plug base body (142) and a protrusion (144) extending from the plug base body (142) toward the magnet (84) along the axial direction; wherein the groove (136) is preferably filled with potting material (146).

10. The motor (60, 260, 360, 460) according to any one of claims 4 to 9. in, The motor (60, 260, 360, 460) includes a first bearing member (86, 88); wherein the rotor housing (82) is supported by the first bearing member (86, 88) and is rotatable relative to the stator (64) about the axis of rotation (RA); wherein the first bearing member (86, 88) is preloaded by biasing members (120, 220, 320, 420).

11. The motor (60, 260, 360, 460) according to claim 10. in, A first spacer (122, 224, 324) is provided between the biasing member (120, 220, 320) and the first bearing member (86, 88); wherein the first spacer (122, 224, 324) is preferably made of plastic material, preferably thermoplastic material, such as polyetheretherketone, polyetherketoneketone, polytetrafluoroethylene, polyethylene, etc.

12. The motor (60, 260, 360, 460) according to claim 10 or 11. in, The biasing components (120, 220, 320, 420) are a single wave spring or a group of wave springs, or a single disc spring or a group of disc springs, or a single wave spring washer or a group of wave spring washers.

13. The motor (60, 260, 360, 460) according to any one of claims 4 to 12. in, The rotor housing (82) is supported by a second bearing member (86, 88); wherein the second bearing member (86, 88) is fixed to the motor housing (62); and wherein a second spacer (124, 222, 322) abuts against the second bearing member (86, 88) along the axial direction; wherein the second spacer (124, 222, 322) is preferably made of a plastic material, preferably a thermoplastic material, such as polyetheretherketone, polyetherketoneketone, polytetrafluoroethylene, polyethylene, etc.

14. A motor assembly (170) comprising a motor (60, 260, 360, 460) according to any one of the preceding claims. in, The motor assembly (170) includes a connector (172); wherein the connector (172) is attached to the second motor end (70); wherein the connector (172) includes a central through-hole (178) extending through the connector (172); wherein the output shaft (132) is at least partially disposed within the central through-hole (178) of the connector (172); wherein the motor assembly (170) includes a flexible shaft (22); wherein the flexible shaft (22) is received within the central through-hole (178) of the connector (172); and wherein the flexible shaft (22) is torque-transmittingly connected to the output shaft (132), and preferably wherein a sealing member (176) is disposed between the connector (172) and the motor housing (62).

15. The motor assembly (170) according to claim 14. in, The motor assembly (170) includes a conduit (12), and the central through-hole (178) of the connector (172) includes a conduit attachment portion (186); wherein an attachment part (190) of the conduit (12) is fixed to the conduit attachment portion (186); wherein the flexible shaft (22) extends through the conduit (12); wherein the attachment part (190) of the conduit (12) is preferably glued to the conduit attachment portion (186).

16. The motor assembly (170) according to claim 15. in, The connector (172) includes at least one glue transfer opening (188) that extends from the outer circumferential surface of the connector (172) into the conduit attachment portion (186).

17. A blood pump (10), particularly an intravascular blood pump, comprising a motor (60, 260, 360, 460) according to any one of claims 1 to 13 or a motor assembly (170) according to any one of claims 14 to 16.

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