Blood pump

Abstract

This disclosure relates to a blood pump 10 comprising: a pumping section 12 having a first blood flow opening 14 and a second blood flow opening 16; a pump element 18 at least partially disposed within the pumping section 12; a drive unit 20 having a rotor 22 and a stator 24, the stator 24 including a first coil assembly 26 and a second coil assembly 28; and a circuit board 32 having a first pad P11 of a first type, a second pad P21 of a first type, a first pad P12 of a second type, and a second pad P22 of a second type. The first pad P12 of a second type and the second pad P22 of a second type are spaced apart from each other on the circuit board 32, and the first pad P12 of a second type is electrically connected to the second pad P22 of a second type by a first bridge 34. The first coil assembly 26 is connected to the first pad P11 of the first type and the first pad P12 of the second type, and the second coil assembly 28 is connected to the second pad P21 of the first type and the second pad P22 of the second type. The first cable 42 is attached to the first pad P11 of the first type, and the second cable 44 is attached to the second pad P21 of the first type. The first cable 42 and the second cable 44 are configured to apply electrical signals to the first coil assembly 26 and the second coil assembly 28 in order to rotate the rotor 22 so that blood flow is generated between the first blood flow opening 14 and the second blood flow opening 16, and to drive the pump element 18.

Description

Technical Field

[0001] The present invention relates to a blood pump.

Background Art

[0002] Various types of blood pumps are known, such as axial flow blood pumps, centrifugal (i.e., radial flow) blood pumps, or combinations of both where blood flow is induced by both radial and axial forces. Such blood pumps are intended to assist a patient's heart and are typically inserted into the patient's heart through a vascular access in the patient's skin, i.e., percutaneously, via a catheter through a blood vessel such as the aorta or femoral artery.

[0003] Such a blood pump typically includes a pumping section having a first blood flow opening and a second blood flow opening. The pump element can be an impeller having blades on its outer periphery.

[0004] The pump element is driven by a drive unit to cause blood flow between at least one first blood flow opening and at least one second blood flow opening. The blood pump can be provided for left ventricular support such that blood flow occurs from the first blood flow opening to the second blood flow opening. In this case, the first blood flow opening is a blood flow inlet and the second blood flow opening is a blood flow outlet. Such a blood pump is also referred to as an intravascular blood pump. Additionally, a blood pump disposed within a patient's heart may also be referred to as an intracardiac blood pump. Of course, such a blood pump can also be used for right ventricular support, and the blood pump does not necessarily have to be deployed within the patient's heart or blood vessel. Rather, such a blood pump can be deployed outside the heart to establish blood flow from the heart to the blood vessel or vice versa from the blood vessel to the heart.

[0005] To establish blood flow, the pump element is positioned at least partially within the pumping section and is generally supported by a shaft or axle, which is driven by a drive unit to rotate the pump element at a selected speed to produce blood flow. Thus, the drive unit typically includes a rotor and a stator. The stator may include several coil assemblies connected to a circuit board. Electrical signals are transmitted to the coil assemblies by cables attached to the circuit board, so that the coil assemblies establish a rotating magnetic field, which in turn causes the rotor to rotate and thus drives the pump element.

[0006] Typically, a circuit board includes multiple pads where cable and coil assemblies are connected to each other by forming nodes, for example, by brazing or soldering. However, because circuit boards have very small dimensions and multiple cables and coils will be mounted on the board, the connection process is demanding and unlikely to be automated, as typically two or more cables will be soldered to a single pad. In addition, the connecting wires of the cables and coil assemblies must be guided to their respective pads, for example, along the perimeter of the circuit board, which will be demanding as bypass currents must be avoided.

[0007] Therefore, some of the connections or nodes are formed by pads located on the opposite side of the circuit board. Typically, the connections of a coil assembly are in a so-called star or Y circuit configuration, where each central node is formed by a relatively large pad located on the opposite side of the circuit board. This circuit configuration has the advantage of being able to utilize the space available on both sides of the circuit board. However, the manufacture of such circuit boards is costly and will only be automated to a certain extent. Alternatively, the central nodes can be formed by twisting and soldering suitable wires, for example, according to International Publication No. 2023 / 018793. However, this configuration requires ensuring that there is ample space, no bypass current is generated, and that undesirable contact between wires and pads or other wires is not unintentionally established. [Overview of the project] [Problems that the invention aims to solve]

[0008] Therefore, an object of the present invention is to provide a blood pump having an improved circuit board that enables simplified assembly. [Means for solving the problem]

[0009] According to a first embodiment, a blood pump may comprise a pumping section, a pump element, a drive unit, a circuit board, a first cable, and a second cable. The pumping section may be a pump housing. The pumping section may have a first blood flow opening and a second blood flow opening. The pump element may be at least partially located within the pumping section. The drive unit may have a rotor and a stator, the stator may include a first coil assembly and a second coil assembly. The circuit board may have a first pad of a first type, a second pad of a first type, a first pad of a second type, and a second pad of a second type. The first pad of a second type and the second pad of a second type may be spaced apart from each other on the circuit board. In other words, the first pad of a second type and the second pad of a second type may be spatially separated from each other on the circuit board. A first pad of a second type can be electrically connected to a second pad of a second type by a first bridge. A first coil assembly can be connected to a first pad of a first type and a first pad of a second type. A second coil assembly can be connected to a second pad of a first type and a second pad of a second type. A first cable can be attached to a first pad of a first type. A second cable can be attached to a second pad of a first type. The first and second cables can be configured to apply electrical signals to the first and second coil assemblies to rotate the rotor and drive the pump element, thereby generating blood flow between the first and second blood flow openings.

[0010] The distance between the first pad of the second type and the second pad of the second type allows the coil assemblies to be easily connected to each other to form the intended circuit configuration. The electrical connection between the first pad of the second type and the second pad of the second type is established by a bridge, so that instead of one large pad, two small pads are provided, which can optionally be provided on the circuit board for connection to each coil assembly. Thus, the two pads can be provided at any desired distance from each other while being electrically connected by the bridge. The bridge increases the overall thickness of the circuit board only slightly and does not affect, or only slightly affects, the overall length of the blood pump.

[0011] Preferably, the first coil assembly includes a first coil of a first type and a second coil of a first type. The circuit board may include a first pad of a third type and a second pad of a third type, wherein the first pad of a third type and the second pad of a third type are spaced apart from each other on the circuit board. In other words, the first pad of a third type and the second pad of a third type may be spatially spaced apart from each other on the circuit board. The first pad of a third type can be electrically connected to the second pad of a third type by a second bridge. The first coil of a first type can be connected to the first pad of a first type to establish a connection between the first coil assembly and the first pad of a first type. The second coil of a first type can be connected to the first pad of a second type to establish a connection between the first coil assembly and the first pad of a second type. The first coil of the first type can be connected to the first pad of the third type, and the second coil of the first type can be connected to the second pad of the third type.

[0012] Therefore, the first coil assembly can be of a multilayer type. Thus, the first coil and the second coil of the first type can be arranged in layers. Alternatively, the first coil and the second coil of the first type can be arranged in a two-slot configuration, facing each other.

[0013] Preferably, the second coil assembly includes a first coil of the second type and a second coil of the second type. The circuit board may include a first pad of the fourth type and a second pad of the fourth type. The first pad of the fourth type and the second pad of the fourth type may be spaced apart from each other on the circuit board. In other words, the first pad of the fourth type and the second pad of the fourth type may be spatially separated from each other on the circuit board. The first pad of the fourth type can be electrically connected to the second pad of the fourth type by a third bridge. The first pad of the fourth type can be electrically connected to the second pad of the fourth type by a third bridge. The first coil of the second type can be connected to the second pad of the first type to establish a connection between the second coil assembly and the second pad of the first type. The second coil of the second type can be connected to the second pad of the second type to establish a connection between the second coil assembly and the second pad of the second type. The first coil of the second type can be connected to the first pad of the fourth type, and the second coil of the second type can be connected to the second pad of the fourth type.

[0014] Therefore, the second coil assembly can be of a multilayer type. Thus, the first coil of the second type and the second coil of the second type can be arranged in layers. Alternatively, the first coil of the second type and the second coil of the second type can be arranged in a two-slot configuration, facing each other.

[0015] Preferably, the stator includes a third coil assembly. The circuit board may include a first type third pad and a second type third pad. The second type first pad, the second type second pad, and the second type third pad may be spaced apart from each other on the circuit board. In other words, the second type first pad, the second type second pad, and the second type third pad may be spatially separated from each other on the circuit board. The second type third pad may be electrically connected to the second type first pad and the second type second pad by a first bridge. The third coil assembly may be connected to the first type third pad and the second type third pad. The blood pump may further include a third cable attached to the first type third pad. The third cable may be configured to apply an electrical signal to the third coil assembly.

[0016] The electrical signal rotates the rotor so that blood flow occurs between the first and second blood flow openings, and also establishes a rotating magnetic field to drive the pump element.

[0017] Therefore, the drive unit can be a three-phase electric motor. In particular, the drive unit can be a three-phase two-pole electric motor.

[0018] Preferably, the third coil assembly includes a first coil of the third type and a second coil of the third type. The circuit board may include a first pad of the fifth type and a second pad of the fifth type. The first pad of the fifth type and the second pad of the fifth type may be spaced apart from each other on the circuit board. In other words, the first pad of the fifth type and the second pad of the fifth type may be spaced apart from each other on the circuit board. The first pad of the fifth type can be electrically connected to the second pad of the fifth type by a fourth bridge. The first coil of the third type can be connected to the third pad of the first type to establish a connection between the third coil assembly and the third pad of the first type. The second coil of the third type can be connected to the third pad of the second type to establish a connection between the third coil assembly and the third pad of the second type. The first coil of the third type can be connected to the first pad of the fifth type. The second coil of the third type can be connected to the second pad of the fifth type.

[0019] Therefore, the third coil assembly can be of a multilayer type. Thus, the first coil of the third type and the second coil of the third type can be arranged in layers. Alternatively, the first coil of the third type and the second coil of the third type can be arranged in a two-slot configuration, facing each other.

[0020] The circuit board may include a first layer having a first side and a second side. First pads of a first type, second pads of a first type, first pads of a second type, and second pads of a second type may be placed on the first side of the first layer. A first bridge may be placed on the second side of the first layer. Placing the bridge on the second side of the first layer saves space for the pads on the first side of the first layer.

[0021] The first layer may include a first opening and a second opening. The circuit board may include a first connector and a second connector. The first connector may extend through the first opening. The second connector may extend through the second opening. The first bridge may be connected to the first and second connectors. A first pad of a second type may be connected to the first connector, and a second pad of a second type may be connected to the second connector. These connectors enable electrical connections between the bridge and the first pad of a second type, and between the bridge and the second pad of a second type.

[0022] A third pad of the first type and a third pad of the second type can be positioned on the first side of the first layer. The first layer may include a third opening, and the circuit board may include a third connector that can extend through the third opening. A first bridge can be connected to the third connector, and a third pad of the second type can be connected to the third connector. The third connector allows for an electrical connection between the first bridge and the third pad of the second type.

[0023] Preferably, the circuit board includes a second layer having a first side and a second side. The first bridge can be located on the first side of the second layer. Thus, the circuit board can have a multilayer configuration.

[0024] The first pad of the third type and the second pad of the third type can be placed on the first side of the first layer. The first pad of the fourth type and the second pad of the fourth type can be placed on the first side of the first layer. The first pad of the fifth type and the second pad of the fifth type can be placed on the first side of the first layer. Thus, all pads intended for connection to a coil can be placed on the first side of the first layer.

[0025] Preferably, the second bridge is disposed on the second side surface of the second layer. The first layer can include a fourth opening and a fifth opening. The second layer can include a sixth opening and a seventh opening. The circuit board can include a fourth connector and a fifth connector. The fourth connector can extend through the fourth opening and the sixth opening, and the fifth connector can extend through the fifth opening and the seventh opening. The second bridge can be connected to the fourth connector and the fifth connector. The first pad of the third type can be connected to the fourth connector, and the second pad of the third type can be connected to the fifth connector.

[0026] Preferably, the third bridge is disposed on the second side surface of the second layer. The first layer can include an eighth opening and a ninth opening, and the second layer can include a tenth opening and an eleventh opening. The circuit board can include a sixth connector and a seventh connector. The sixth connector can extend through the eighth opening and the tenth opening, and the seventh connector can extend through the ninth opening and the eleventh opening. The third bridge can be connected to the sixth connector and the seventh connector. The first pad of the fourth type can be connected to the sixth connector, and the second pad of the fourth type can be connected to the seventh connector.

[0027] Preferably, the fourth bridge is provided on the second side surface of the second layer. The first layer can include a twelfth opening and a thirteenth opening, and the second layer can include a fourteenth opening and a fifteenth opening. The circuit board can include an eighth connector and a ninth connector. The eighth connector can extend through the twelfth opening and the fourteenth opening, and the ninth connector can extend through the thirteenth opening and the fifteenth opening. The fourth bridge can be connected to the eighth connector and the ninth connector. The first pad of the fifth type can be connected to the eighth connector, and the second pad of the fifth type can be connected to the ninth connector.

[0028] Placing at least one of the second to fourth bridges on the second side surface of the second layer of the circuit board saves space on the first side surface of the first layer and also allows for a flexible arrangement of each pad on the first side surface of the first layer because the electrical connections between the pads are established by the respective connectors and the respective bridges.

[0029] The circuit board can include an adhesive foil on the opposite side of the first side surface of the first layer. Preferably, the adhesive foil is provided on the second side surface of the second layer. Thus, the circuit board can be easily attached to each component of the blood pump, such as the stator.

[0030] The pads can be arranged on the circuit board in an annular pattern or a ring pattern respectively, and at least one pad of a different type is arranged between two pads of the same type. Preferably, at least one pad of a different type is arranged between all pads of the same type. This allows for a flexible attachment of the cable and coil assembly to the circuit board and significantly reduces the need to guide the cable and wire along the outer periphery of the circuit board or the stator respectively.

[0031] Preferably, the circuit board has an annular shape. The circuit board may have a central opening. The circuit board may have an outer diameter of 2 mm to 4 mm, preferably 3 mm. The central opening may have a diameter of 1 mm to 2 mm, preferably 1.6 mm. The circuit board may have a thickness of 0.1 mm to 0.3 mm, preferably 0.22 mm in the axial direction.

[0032] The first layer may have a thickness of 0.02 mm to 0.07 mm, preferably 0.05 mm, in the axial direction. The first layer may contain polyimide or consist of polyimide. The second layer may have a thickness of 0.02 mm to 0.07 mm, preferably 0.05 mm, in the axial direction. The second layer may contain polyimide or consist of polyimide.

[0033] At least one or even all of the pads may contain copper or be made from copper. At least one or even all of the pads may be gold-plated. At least one or even all of the pads may have a thickness of 0.015 mm to 0.055 mm, preferably 0.035 mm, in the axial direction.

[0034] At least one or even all of the bridges may contain copper or be made from copper. At least one or even all of the bridges may be gold-plated. At least one or even all of the bridges may have a thickness of 0.015 mm to 0.055 mm, preferably 0.035 mm, in the axial direction.

[0035] The adhesive foil can have a thickness of 0.02 mm to 0.07 mm, preferably 0.05 mm, in the axial direction.

[0036] At least one or even all of the openings may have a diameter of 0.05 mm to 0.15 mm, preferably 0.1 mm.

[0037] At least one or more connectors may contain copper or be made from copper. At least one or more connectors may be gold-plated. One or all connectors may be bolt-shaped. At least one or more connectors may have a diameter of 0.08 mm to 0.12 mm, preferably 0.1 mm.

[0038] As used herein, the terms “distanced” or “spatially separated” should be understood to mean that each pad is located at a certain distance from one another on the circuit board, and therefore there is no direct contact between them. In other words, each pad that is distanced from one another on the circuit board is positioned on the circuit board so as not to be in direct contact with one another. In other words, each pad can be electrically connected by an appropriate device, for example, by a first bridge with respect to the electrical connection between a first pad of a second type and a second pad of a second type, rather than in contact with or touching each other.

[0039] The above summary and the following detailed description of preferred embodiments will be better understood in conjunction with the accompanying drawings. The drawings are referenced to illustrate the disclosure. However, the scope of this disclosure is not limited to the specific embodiments disclosed in the drawings. [Brief explanation of the drawing]

[0040] [Figure 1] This is a side view of the blood pump according to this disclosure. [Figure 2] Figure 1 is a front view of the blood pump. [Figure 3] This is a cross-sectional view along line AA shown in Figure 2. [Figure 4] This is a cross-sectional view along line BB shown in Figure 3. [Figure 5] This is a perspective view of the circuit board according to this disclosure. [Figure 6] Figure 5 is a top view of the circuit board. [Figure 7] Figure 5 is a side view of the circuit board. [Figure 8] This is a magnified view of detail X in Figure 7. [Figure 9] Further elements are shown in Figure 5, a rear view of the circuit board. [Figure 10] Figure 5 is an exploded view of the circuit board. [Figure 11] This figure shows an example of the connection between the stator and the circuit board shown in Figure 5. [Modes for carrying out the invention]

[0041] In the figures, similar reference numbers indicate the same or identical elements. Furthermore, for clarity, not all reference numbers are shown in every figure.

[0042] Figure 1 shows a side view of the blood pump 10, and Figure 2 shows a front view of the blood pump 10. In this exemplary embodiment, the blood pump 10 is an intravascular blood pump for left ventricular support. The blood pump 10 comprises a pumping section in the form of a tubular blood pump housing 12, a shaft 110, a pump element 18, a drive unit 20, a purge fluid line 112, and a cable assembly 132. The purge fluid line 112 is shown schematicly in Figure 1 but can be configured as shown in U.S. Patent Application Publication No. 2021 / 0339003, which is incorporated herein by reference in its entirety. In this exemplary embodiment, the shaft 110 is entirely fabricated from alumina-reinforced zirconia.

[0043] In this exemplary embodiment, the blood pump housing 12 is a multi-part housing comprising a first housing component 114 and a second housing component 116. The first housing component 114 comprises an outer casing 118, a distal end 120, and a proximal end 122 (see also Figures 3 and 4). A first blood flow opening 14 is provided at the distal end 120 of the first housing component 114. In addition, at least one second blood flow opening 16 is provided between the distal end 120 and the proximal end 122 of the first housing component 114. In this exemplary embodiment, the first housing component 114 comprises six second blood flow openings 16, which are provided at equal intervals around the first housing component 114 in the outer casing 118, forming a radial opening in the outer casing 118. The second blood flow opening 16 is separated by struts 124, and in this exemplary embodiment, there are a total of six struts 124.

[0044] As shown in the detailed views of Figures 3 and 4 (the purge fluid line 112 is not shown), the end of the blood pump housing 12 opposite the distal end 120 of the first housing component 114 and the first blood flow opening 14 is a tubular portion, which includes a threaded portion 138 on its outer surface substantially corresponding to a male thread. The threaded portion 138 is configured to screw onto a helical member in the form of a Nitinol coil 136. In particular, the Nitinol coil 138 is screwed onto the threaded portion 138 to attach, for example, a catheter (not shown) to the pump housing 12. The purge fluid line 112 and cable assembly 132 can be located within the catheter.

[0045] The pump element 18 is non-rotatably supported on the shaft 110 so as to be partially positioned within the first housing component 114. In this embodiment, the pump element 18 is an impeller having blades on its outer circumferential surface. The impeller 18 rotates with the shaft 110 about a central axis of rotation RA so that blood is transported between the first blood flow opening 14 and a plurality of second blood flow openings 16 (see also Figures 3 and 4). Since the blood pump 10 in the illustrated embodiment is intended for left ventricular support, blood flow is induced from the first blood flow opening 14 to a plurality of second blood flow openings 16, i.e., the first blood flow opening 14 is a blood inlet and each of the second blood flow openings 16 is a blood outlet.

[0046] As can be seen in the cross-sections of Figures 3 and 4, looking from the distal end 120 to the proximal end 122 of the first housing component 114, the shaft 110 is supported at two spaced-apart points: a shaft support portion 126 located very close to the impeller 18, and a bearing washer 128 positioned axially behind the drive unit 20 in the second housing component 116. Thus, the drive unit 20 is sandwiched between the shaft support portion 126 and the bearing washer 128. The bearing washer 128 can be a sliding bearing.

[0047] The rotation of the shaft 110 is caused by the drive unit 20. As shown in Figures 3 and 4, the drive unit 20 includes a magnet 22 as a rotor and a stator 24. The magnet 22 is non-rotatably supported on the shaft 110 and is radially positioned within the stator 24. The stator 24 is housed within the blood pump housing 12, particularly within the second housing component 116. In this embodiment, the stator 24 is a multilayer stator coil, preferably having two winding layers embedded in a suitable synthetic material or synthetic resin, as will be described in more detail below.

[0048] The magnet 22 includes recesses 130 at both axial ends that are recessed toward the other end of these axial ends. During the assembly of the blood pump 10, the recesses 130 are filled with adhesive. An alternating magnetic field is induced by the excitation of the stator 24 by the cable assembly 132, and this alternating magnetic field induces a force on the magnet 22 so that it rotates with the shaft 110 around the central rotation axis RA, and thus the impeller 18 causes blood flow as described above. The excitation of the stator 24 is known in itself, for example, from International Publication No. 2023 / 018793, which is incorporated herein by reference in its entirety.

[0049] Furthermore, a washer 134 is supported on the shaft 110 between the shaft support portion 126 and the magnet 22. The washer 134 is intended to properly position the magnet 22 on the shaft 110. The washer 134 can be a thrust washer.

[0050] To excite the stator 24 and generate an alternating magnetic field, the stator 24 is connected to the cable assembly 132 via a circuit board 32. In this exemplary embodiment, the circuit board 32 is a multilayer printed circuit board 32 having an annular or ring shape, respectively (see Figures 5 to 10). The circuit board 32 has an outer diameter of 2 mm to 4 mm, preferably 3 mm, and includes a central opening 140 having a diameter of 1 mm to 2 mm, preferably 1.6 mm. The circuit board 32 is configured to be supported by a bearing washer 128 such that a portion of the bearing washer 128 extends through the central opening 140 (see Figures 3 and 4).

[0051] The circuit board 32 includes a first layer 48, a second layer 54, and an adhesive foil 108, with the second layer 54 positioned between the first layer 48 and the adhesive foil 108 (see, for example, Figure 8). The first layer 48 and the second layer 54 each have a thickness of 0.02 mm to 0.07 mm, preferably 0.05 mm, in the axial direction. The first layer 48 and the second layer 54 are made from a suitable plastic material, such as polyimide. The adhesive foil 108 has a thickness of 0.02 mm to 0.07 mm, preferably 0.05 mm, in the axial direction. The adhesive foil 108 is configured as a double-sided adhesive foil so that it can be attached to the second layer 54 and the bearing washer 128. The circuit board 32 has a thickness of 0.1 mm to 0.3 mm, preferably 0.22 mm, in the axial direction.

[0052] The first layer 48 has a first side surface 50 facing the threaded portion 138 and a second side surface 52 opposite to the first side surface 50. The second layer 54 has a first side surface 56 facing the second side surface 52 of the first layer 48 and a second side surface 58 facing the adhesive foil 108. A plurality of pads P11 to P25 are arranged on the first side surface 50 of the first layer 48. As shown in Figures 5 and 6, the plurality of pads P11 to P25 are arranged in an annular or ring shape on the first side surface 50 of the first layer 48. The plurality of pads P11 to P25 are made of gold-plated copper. Each of the plurality of pads P11 to P25 has a thickness of 0.015 mm to 0.055 mm, preferably 0.035 mm, in the axial direction.

[0053] Furthermore, the first layer 48 includes a first opening 60, a second opening 62, a third opening 68, a fourth opening 72, a fifth opening 74, an eighth opening 84, a ninth opening 86, a twelfth opening 96, and a thirteenth opening 98, all of which completely penetrate the first layer 48 (see Figure 10). The second layer 54 includes a sixth opening 76, a seventh opening 78, a tenth opening 88, an eleventh opening 90, a fourteenth opening 100, and a fifteenth opening 102, all of which completely penetrate the second layer 54 (see Figure 10).

[0054] The first bridge 34 is positioned on the second side 52 of the first layer 48 and the first side 56 of the second layer 54, respectively. Thus, the first bridge 34 is sandwiched between the first layer 48 and the second layer 54 (see also Figures 7 and 8). The first bridge 34 is made of gold-plated copper and has a thickness of 0.015 mm to 0.055 mm, preferably 0.035 mm, in the axial direction.

[0055] The second bridge 36 is positioned on the second side surface 58 of the second layer 54. Thus, the second bridge 36 is sandwiched between the second layer 54 and the adhesive foil 108 (see also Figures 7 and 8). The second bridge 36 is made of gold-plated copper and has a thickness of 0.015 mm to 0.055 mm, preferably 0.035 mm, in the axial direction.

[0056] The third bridge 38 is positioned on the second side surface 58 of the second layer 54. Thus, the third bridge 38 is sandwiched between the second layer 54 and the adhesive foil 108 (see also Figures 7 and 8). The third bridge 38 is made of gold-plated copper and has a thickness of 0.015 mm to 0.055 mm, preferably 0.035 mm, in the axial direction.

[0057] The fourth bridge 40 is positioned on the second side surface 58 of the second layer 54. Thus, the fourth bridge 40 is sandwiched between the second layer 54 and the adhesive foil 108 (see also Figures 7 and 8). The fourth bridge 40 is made of gold-plated copper and has a thickness of 0.015 mm to 0.055 mm, preferably 0.035 mm, in the axial direction.

[0058] As can be seen in Figure 8, the second bridge 36, the third bridge 38, and the fourth bridge 40 are embedded within the adhesive foil 108, while the first bridge 34 is sandwiched between the first layer 48 and the second layer 54. Furthermore, the second layer 54 electrically insulates the first bridge 36 from the second bridge 36 and the fourth bridge 40.

[0059] The multiple pads P11 to P25 include a first pad P11 of a first type, a second pad P21 of a first type, a third pad P31 of a first type, a first pad P22 of a second type, a third pad P32 of a second type, a first pad P13 of a third type, a second pad P23 of a third type, a first pad P14 of a fourth type, a second pad P24 of a fourth type, a first pad P15 of a fifth type, and a second pad P25 of a fifth type. For example, as shown in Figure 6, the pads P11 to P25 are arranged on the first side 50 of the first layer 48 such that there is always at least one pad of a different type between two pads of the same type.

[0060] In other words, the first pad P11 of the first type, the second pad P21 of the first type, and the third pad P31 of the first type are spaced apart from each other on the circuit board 32 or the first layer 48. Therefore, the first pad P12 of the second type, the second pad P22 of the second type, and the third pad P32 of the second type are spaced apart from each other on the circuit board 32 or the first layer 48. The first pad P13 of the third type and the second pad P32 of the third type are spaced apart from each other on the circuit board 32 or the first layer 48. The first pad P14 of the fourth type and the second pad P24 of the fourth type are spaced apart from each other on the circuit board 32 or the first layer 48. The first pad P15 of the fifth type and the second pad P25 of the fifth type are spaced apart from each other on the circuit board 32 or the first layer 48.

[0061] Furthermore, the first pad P12 of the second type, the second pad P22 of the second type, and the third pad P32 of the second type are electrically connected to each other by the first bridge 34. Specifically, the first connector 64 extends through the first opening 60 and connects the first pad P12 of the second type to the first bridge 34. The second connector 66 extends through the second opening 62 and connects the second pad P22 of the second type to the first bridge 34. The third connector 70 extends through the third opening 68 and connects the third pad P32 of the second type to the first bridge 34.

[0062] The first pad P13 of the third type and the second pad P23 of the third type are electrically connected to each other by the second bridge 36. In particular, the fourth connector 80 extends through the fourth opening 72 and the sixth opening 76 to connect the first pad P13 of the third type to the second bridge 36. The fifth connector 82 extends through the fifth opening 74 and the seventh opening 78 to connect the second pad P23 of the third type to the second bridge 36.

[0063] The first pad P14 of the fourth type and the second pad P24 of the fourth type are electrically connected to each other by a third bridge 38. In particular, a sixth connector 92 extends through an eighth opening 84 and a tenth opening 88 to connect the first pad P14 of the fourth type to the third bridge 38. A seventh connector 94 extends through a ninth opening 86 and an eleventh opening 90 to connect the second pad P24 of the fourth type to the third bridge 38.

[0064] The first pad P15 of the fifth type and the second pad P25 of the fifth type are electrically connected to each other by the fourth bridge 40. In particular, the eighth connector 104 extends through the twelfth opening 96 and the fourteenth opening 100 to connect the first pad P15 of the fifth type to the fourth bridge 40. The ninth connector 106 extends through the thirteenth opening 98 and the fifteenth opening 102 to connect the second pad P25 of the fifth type to the fourth bridge 40.

[0065] The first to ninth connectors are bolt-shaped, made of copper, and may be gold-plated. The first to ninth connectors have a diameter of 0.08 mm to 0.12 mm, preferably 0.1 mm.

[0066] The overall configuration of pads P11 to P25 and the first to fourth bridges 34 to 40 can be seen in Figure 9. In Figure 9, pads P11 to P25 and bridges 34 to 40 are indicated by thin dashed lines. As can be further seen in Figure 10, bridges 34 to 40 are arranged on the circuit board 32 such that there are no electrical connections between them. Thus, the first type of pads P11 to P31, the second type of pads P12 to P32, the third type of pads P13 and P23, the fourth type of pads P14 and P24, and the fifth type of pads P15 and P25 are arranged such that there are no electrical connections between different types of pads by the circuit board 32.

[0067] As illustrated in Figure 11, the first cable 42 of the cable assembly 132 is attached to the first pad P11 of the first type, the second cable 44 of the cable assembly 132 is attached to the second pad P21 of the first type, and the third cable 46 of the cable assembly 132 is attached to the third pad P31 of the first type. The first cable 42, the second cable 44, and the third cable 46 are attached to the respective pads P11 to P31 of the first type by appropriate procedures, for example, by laser soldering or ultrasonic soldering.

[0068] In this exemplary embodiment, the stator 24 comprises a first coil assembly 26, a second coil assembly 28, and a third coil assembly 30. Thus, the drive unit 20 is a three-phase two-pole electric motor. As shown in Figure 11, the first coil assembly 26 includes a first coil of a first type C11 and a second coil of a first type C21, which are located on opposite sides of the stator 24. The first coil of a first type C11 is a multilayer coil having multiple windings. The first coil of a first type C11 is connected by wire to a first pad of a first type P11 and by wire to a first pad of a third type P13. The second coil of a first type C21 is a multilayer coil having multiple windings. The second coil of a first type C21 is connected by wire to a second pad of a third type P23 and by wire to a first pad of a second type P12.

[0069] The second coil assembly 28 includes a first coil C12 of a second type and a second coil C22 of a second type, which are positioned opposite each other on the stator 24. The first coil C12 of a second type is a multilayer coil having multiple windings. The first coil C12 of a second type is connected by wire to a second pad P12 of a first type and by wire to a first pad P14 of a fourth type. The second coil C22 of a second type is a multilayer coil having multiple windings. The second coil C22 of a second type is connected by wire to a second pad P24 of a fourth type and by wire to a second pad P22 of a second type.

[0070] The third coil assembly 30 includes a first coil C13 of a third type and a second coil C23 of a third type, which are positioned opposite each other on the stator 24. The first coil C13 of a third type is a multilayer coil having multiple windings. The first coil C13 of a third type is connected by wire to a third pad P13 of a first type and by wire to a first pad P15 of a fifth type. The second coil C23 of a third type is a multilayer coil having multiple windings. The second coil C23 of a third type is connected by wire to a second pad P25 of a fifth type and by wire to a third pad P32 of a second type.

[0071] The wires of coil assemblies C11 to C23 are attached to their respective pads by appropriate procedures, for example, by laser soldering or ultrasonic soldering. Thus, the coils of each coil assembly 26, 28, and 30 are connected in sequence via their respective pads, and these coil assemblies are configured in a star or Y circuit configuration via the second type of pads P12 to P32. Thus, the electrical signals applied to the first coil assembly 26 by the first cable 42, the electrical signals applied to the second coil assembly 28 by the second cable 44, and the electrical signals applied to the third coil assembly 30 by the third cable 46 cause the magnet 22 to rotate together with the impeller 18 so that the intended blood flow is produced.

[0072] Exemplary Embodiments As previously described, the technologies described herein can be implemented in a variety of ways. In this regard, the foregoing disclosure is intended to include, but is not limited to, the systems, methods, and combinations thereof and partial combinations thereof described in the following exemplary embodiments. Preferred embodiments are described in the following sections.

[0073] A1 A blood pump comprising a pumping section having a first blood flow opening and a second blood flow opening, a pump element at least partially disposed within the pumping section, and a drive unit having a rotor and a stator.

[0074] A2 A blood pump as described in item A1, wherein the stator includes a first coil assembly and / or a second coil assembly.

[0075] A3 A blood pump according to item A2, wherein the blood pump further comprises a circuit board having a first pad of a first type, a second pad of a first type, a first pad of a second type, and a second pad of a second type.

[0076] A4 A blood pump as described in item A3, wherein the first pad of the second type and the second pad of the second type are spaced apart from each other on the circuit board.

[0077] A5 A blood pump as described in item A4, wherein the first pad of the second type is electrically connected to the second pad of the second type by a first bridge.

[0078] A6 A blood pump as described in item A5, wherein the first coil assembly is connected to a first pad of a first type and a first pad of a second type.

[0079] A7 A blood pump as described in item A6, wherein the second coil assembly is connected to a second pad of the first type and a second pad of the second type.

[0080] A8 A blood pump as described in any one of paragraphs A3 to A7, wherein the blood pump further comprises a first cable attached to a first pad of a first type, and / or a second cable attached to a second pad of a first type.

[0081] A9 A blood pump as described in item A8, wherein a first cable and a second cable are configured to rotate a rotor so as to generate blood flow between a first blood flow opening and a second blood flow opening, and to apply electrical signals to a first coil assembly and a second coil assembly to drive the pump elements.

[0082] A10 A blood pump as described in any one of paragraphs A2 to A9, wherein the first coil assembly comprises a first coil of a first type and a second coil of a first type.

[0083] A11 A blood pump according to any one of paragraphs A1 to A10, wherein the circuit board includes a first pad of a third type and a second pad of a third type.

[0084] A12 A blood pump as described in item A11, wherein the first pad of the third type and the second pad of the third type are spaced apart from each other on the circuit board.

[0085] A13 A blood pump as described in item A11 or A12, wherein a first pad of a third type is electrically connected to a second pad of a third type by a second bridge.

[0086] A14 A blood pump according to any one of paragraphs A11 to A13, wherein a first coil of a first type is connected to a first pad of a first type to establish a connection between the first coil assembly and the first pad of a first type.

[0087] A15 A blood pump according to any one of paragraphs A11 to A14, wherein a second coil of the first type is connected to a first pad of the second type to establish a connection between the first coil assembly and the first pad of the second type.

[0088] A16 A blood pump as described in any one of paragraphs A11 to A15, wherein a first coil of the first type is connected to a first pad of the third type, and / or a second coil of the first type is connected to a second pad of the third type.

[0089] A17 A blood pump as described in any one of paragraphs A1 to A16, wherein the second coil assembly comprises a first coil of a second type and a second coil of a second type.

[0090] A18 A blood pump as described in any one of paragraphs A1 to A17, wherein the circuit board includes a first pad of type 4 and a second pad of type 4.

[0091] A19 A blood pump as described in item A18, wherein the first pad of the fourth type and the second pad of the fourth type are spaced apart from each other on the circuit board.

[0092] A20 A blood pump as described in item A18 or A19, wherein a first pad of type 4 is electrically connected to a second pad of type 4 by a third bridge.

[0093] A21 A blood pump as described in any one of paragraphs A17 to A20, wherein a first coil of a second type is connected to a second pad of a first type to establish a connection between the second coil assembly and the second pad of a first type.

[0094] A22 A blood pump according to any one of paragraphs A17 to A21, wherein a second coil of a second type is connected to a second pad of a second type to establish a connection between the second coil assembly and the second pad of a second type.

[0095] A23 A blood pump according to any one of paragraphs A18 to A22, wherein a first coil of a second type is connected to a first pad of a fourth type, and / or a second pad of a second type is connected to a second pad of a fourth type.

[0096] A24 A blood pump as described in any one of paragraphs A1 to A23, wherein the stator includes a third coil assembly.

[0097] A25 A blood pump as described in item A24, wherein the circuit board includes a third pad of a first type and a third pad of a second type.

[0098] A26 A blood pump as described in item A25, wherein the first pad of the second type, the second pad of the second type, and the third pad of the second type are spaced apart from each other on the circuit board.

[0099] A27 A blood pump as described in item A25 or A26, wherein the third pad of the second type is electrically connected to the first pad of the second type and the second pad of the second type by a first bridge.

[0100] A28 A blood pump as described in any one of paragraphs A23 to A27, wherein the third coil assembly is connected to a third pad of a first type and a third pad of a second type.

[0101] A29 A blood pump as described in any one of paragraphs A25 to A28, wherein the blood pump further comprises a third cable attached to a third pad of the first type.

[0102] A30 A blood pump as described in item A29, wherein a third cable is configured to apply an electrical signal to a third coil assembly.

[0103] A31 A blood pump as described in any one of paragraphs A24 to A30, wherein the third coil assembly comprises a first coil of a third type and a second coil of a third type.

[0104] A32 A blood pump as described in item A31, wherein the circuit board includes a first pad of type 5 and a second pad of type 5.

[0105] A33 A blood pump as described in item A32, wherein the first pad of type 5 and the second pad of type 5 are spaced apart from each other on the circuit board.

[0106] A34 A blood pump as described in item A32 or A33, wherein a first pad of type 5 is electrically connected to a second pad of type 5 by a fourth bridge.

[0107] A35 A blood pump as described in any one of paragraphs A32 to A34, wherein a first coil of a third type is connected to a third pad of a first type to establish a connection between the third coil assembly and the third pad of a first type.

[0108] A36 A blood pump according to any one of paragraphs A32 to A35, wherein a second coil of a third type is connected to a third pad of a second type to establish a connection between the third coil assembly and the third pad of a second type.

[0109] A37 A blood pump as described in any one of paragraphs A32 to A36, wherein a first coil of a third type is connected to a first pad of a fifth type, and / or a second coil of a third type is connected to a second pad of a fifth type.

[0110] A38 A blood pump according to any one of paragraphs A3 to A37, wherein the circuit board includes a first layer having a first side and a second side.

[0111] A39 A blood pump according to paragraph 38, wherein a first pad of the first type and / or a second pad of the first type and / or a first pad of the second type and / or a second pad of the second type are arranged on the first side of the first layer, and / or a first bridge is arranged on the second side of the first layer.

[0112] A40 A blood pump according to item A38 or A39, wherein a first layer includes a first opening, a circuit board includes a first connector, the first connector extends through the first opening, a first bridge is connected to the first connector, and a second type of first pad is connected to the first connector.

[0113] A41 A blood pump according to any one of paragraphs A38 to A40, wherein a first layer includes a second opening, a circuit board includes a second connector extending through the second opening, a first bridge is connected to the second connector, and a second pad of a second type is connected to the second connector.

[0114] A42 A blood pump according to any one of paragraphs A38 to A41, wherein the third pad of the first type and the third pad of the second type are positioned on the first side (50) of the first layer.

[0115] A43 A blood pump according to any one of paragraphs A38 to A42, wherein a first layer includes a third opening and a third connector extending through the third opening, a first bridge is connected to the third connector, and a third pad of a second type is connected to the third connector.

[0116] A44 A blood pump according to any one of paragraphs A3 to A43, wherein the circuit board includes a second layer having a first side and a second side.

[0117] A45 A blood pump as described in item A44, wherein the first bridge is located on the first side of the second layer.

[0118] A46 A blood pump according to any one of paragraphs A38 to A45, wherein a first pad of a third type and / or a second pad of a third type are positioned on a first side of a first layer, and / or a first pad of a fourth type and / or a second pad of a fourth type are positioned on a first side of a first layer, and / or a first pad of a fifth type and / or a second pad of a fifth type are positioned on a first side of a first layer.

[0119] A47 A blood pump according to any one of paragraphs A44 to A46, wherein the second bridge is located on the second side of the second layer.

[0120] A48 A blood pump according to any one of paragraphs A44 to A47, wherein a first layer includes a fourth opening, a second layer includes a sixth opening, a circuit board includes a fourth connector, the fourth connector extends through the fourth and sixth openings, a second bridge is connected to the fourth connector, and a first pad of a third type is connected to the fourth connector.

[0121] A49 A blood pump according to any one of paragraphs A44 to A48, wherein a first layer includes a fifth opening, a second layer includes a seventh opening, a circuit board includes a fifth connector, the fifth connector extends through the fifth and seventh openings, a second bridge is connected to the fifth connector, and a second pad of a third type is connected to the fifth connector.

[0122] A50 A blood pump as described in any one of paragraphs A44 to A49, wherein the third bridge is located on the second side of the second layer.

[0123] A51 A blood pump according to any one of paragraphs A44 to A50, wherein a first layer includes an eighth opening, a second layer includes a tenth opening, a circuit board includes a sixth connector, the sixth connector extends through the eighth and tenth openings, a third bridge is connected to the sixth connector, and a first pad of a fourth type is connected to the sixth connector.

[0124] A52 A blood pump according to any one of paragraphs A44 to A51, wherein a first layer includes a ninth opening, a second layer includes an eleventh opening, a circuit board includes a seventh connector, the seventh connector extends through the ninth and eleventh openings, a third bridge is connected to the seventh connector, and a second pad of a fourth type is connected to the seventh connector.

[0125] A53 A blood pump according to any one of paragraphs A44 to A52, wherein the fourth bridge is located on the second side of the second layer.

[0126] A54 A blood pump according to any one of paragraphs A44 to A53, wherein a first layer includes a twelfth opening, a second layer includes a fourteenth opening, a circuit board includes an eighth connector, the eighth connector extends through the twelfth and fourteenth openings, a fourth bridge is connected to the eighth connector, and a fifth type first pad is connected to the eighth connector.

[0127] A55 A blood pump according to any one of paragraphs A44 to A54, wherein a first layer includes a thirteenth opening, a second layer includes a fifteenth opening, a circuit board includes a ninth connector, the ninth connector extends through the thirteenth and fifteenth openings, a fourth bridge is connected to the ninth connector, and a fifth type second pad is connected to the ninth connector.

[0128] A56 A blood pump according to any one of items A1 to A55, wherein the circuit board includes adhesive foil.

[0129] A57 A blood pump according to item A56, wherein the adhesive foil is positioned on the side opposite to the first side of the first layer, preferably on the second side of the second layer.

[0130] A58 A blood pump as described in any one of items A3 to A57, wherein the pads are arranged in a ring pattern on the circuit board.

[0131] A59 A blood pump as described in item A58, wherein at least one pad of a different type is positioned between two pads of the same type.

[0132] A60 A blood pump as described in any one of items A1 to A59, wherein the blood pump is an intravascular blood pump.

[0133] A61 A blood pump as described in any one of items A1 to A60, wherein the pump element is an impeller.

[0134] A62 A blood pump according to any one of items A1 to A60, wherein the drive unit is a three-phase electric motor, preferably a three-phase two-pole electric motor.

[0135] A63 A blood pump as described in any one of items A3 to A62, wherein the circuit board is a printed circuit board.

[0136] A64 A blood pump according to any one of items A3 to A63, wherein the circuit board has an annular shape.

[0137] A65 A blood pump according to any one of items A3 to A64, wherein the circuit board has a central opening.

[0138] A66 A blood pump as described in item A65, wherein the central opening has a diameter of 1 mm to 2 mm, preferably 1.6 mm.

[0139] A67 A blood pump according to any one of items A3 to A66, wherein the circuit board has an outer diameter of 2 mm to 4 mm, preferably 3 mm.

[0140] A68 A blood pump according to any one of items A3 to A67, wherein the circuit board has a thickness of 0.1 mm to 0.3 mm, preferably 0.22 mm, in the axial direction.

[0141] A69 A blood pump according to any one of items A38 to A68, wherein the first layer has a thickness of 0.02 mm to 0.07 mm, preferably 0.05 mm, in the axial direction.

[0142] A70 A blood pump according to any one of paragraphs A38 to A69, wherein the first layer contains or consists of polyimide.

[0143] A71 A blood pump according to any one of items A44 to A70, wherein the second layer has a thickness of 0.02 mm to 0.07 mm, preferably 0.05 mm, in the axial direction.

[0144] A72 A blood pump according to any one of paragraphs A44 to A71, wherein the second layer contains or consists of polyimide.

[0145] A73 A blood pump as described in any one of paragraphs A3 to A72, wherein at least one or more of the pads contain copper or are made of copper.

[0146] A74 A blood pump as described in any one of paragraphs A3 to A73, wherein at least one or all of the pads are gold-plated.

[0147] A75 A blood pump according to any one of items A3 to A74, wherein at least one or more of the pads have a thickness of 0.015 mm to 0.055 mm, preferably 0.035 mm, in the axial direction.

[0148] A76 A blood pump as described in any one of paragraphs A5 to A75, wherein at least one or all of the bridges contain or are made of copper.

[0149] A77 A blood pump as described in any one of paragraphs A5 to A76, wherein at least one or all of the bridges are gold-plated.

[0150] A78 A blood pump according to any one of items A5 to A77, wherein at least one or more of the bridges have a thickness of 0.015 mm to 0.055 mm, preferably 0.035 mm, in the axial direction.

[0151] A79 A blood pump according to any one of items A56 to A78, wherein the adhesive foil has a thickness of 0.02 mm to 0.07 mm, preferably 0.05 mm, in the axial direction.

[0152] A80 A blood pump according to any one of items A40 to A79, wherein at least one or more of the openings have a diameter of 0.05 mm to 0.15 mm, preferably 0.1 mm.

[0153] A81 A blood pump as described in any one of paragraphs A40 to A80, wherein at least one or more of the connectors contain copper or are made of copper.

[0154] A82 A blood pump as described in any one of paragraphs A40 to A81, wherein at least one or all of the connectors are gold-plated.

[0155] A83 A blood pump as described in any one of paragraphs A40 to A82, wherein one or all of the connectors are bolt-shaped.

[0156] A84 A blood pump according to any one of items A40 to A83, wherein at least one or all of the connectors have a diameter of 0.08 mm to 0.12 mm, preferably 0.1 mm.

[0157] A85 A blood pump as described in any one of paragraphs A1 to A84, wherein the blood pump comprises a nitinol coil.

[0158] A86 A blood pump as described in item A85, wherein the nitinol coil is attached to the pumping section.

[0159] A87 A blood pump as described in item A85 or item A86, wherein the pumping section includes a threaded portion, and a nitinol coil is screwed onto the threaded portion.

[0160] A88 A blood pump as described in any one of the paragraphs A1 through A87, wherein the pumping section is a pumping housing.

[0161] Where used herein, the terms “approximately,” “about,” “substantially,” and similar terms are intended to have a broad meaning consistent with common usage accepted by those skilled in the art in the field of the subject matter of this disclosure. Where used herein, “proximal” and “distal” are as seen from the perspective of medical staff or physicians. Thus, when the blood pump is introduced into a patient’s body, proximal indicates being relatively close to the physician, while distal indicates being relatively far from the physician. It should be understood by those skilled in the art who examine this disclosure that these terms are intended to allow for descriptions of certain features described without limiting the scope of these features to the precise numerical ranges presented. Thus, these terms should be interpreted as indicating a non-substantial or trivial variation or alteration of the subject matter described and considered to be within the scope of this disclosure. Where used herein, the terms “at least partially” or “partially” have both the meaning of “partial” and the meaning of “whole” or “completely.” Terms like "first," "second," or "third" are not intended to indicate a specific order, but simply to distinguish elements semantically from each other. [Explanation of symbols]

[0162] 10 Blood pump, 12 Pumping section / pump housing, 14 First blood flow opening, 16 Second blood flow opening, 18 Pump element / impeller, 20 Drive unit, 22 Rotor / magnet, 24 Stator, 26 First coil assembly, 28 Second coil assembly, 30 Third coil assembly, 32 Circuit board, 34 First bridge, 36 Second bridge, 38 Third bridge, 40 Fourth bridge, 42 First cable, 44 Second cable, 46 Third cable, 48 First layer, 50 First side of first layer, 52 Second side of first layer, 54 Second layer, 56 First side of second layer, 58 Second side of second layer, 60 First opening, 62 Second opening, 64 1st connector, 66 2nd connector, 68 3rd opening, 70 3rd connector, 72 4th opening, 74 5th opening, 76 6th opening, 78 7th opening, 80 4th connector, 82 5th connector, 84 8th opening, 86 9th opening, 88 10th opening, 90 11th opening, 92 6th connector, 94 7th connector, 96 12th opening, 98 13th opening, 100 14th opening, 102 15th opening, 104 8th connector, 106 9th connector, 108 adhesive foil, 110 shaft, 112 purge fluid line, 114 1st housing component, 116 2nd housing component, 118 outer casing, 120 distal end, 122 Proximal end, 124 Strut, 126 Shaft support section, 128 Bearing washer, 130 Magnet recess, 132 Cable assembly, 134 Washer, 136 Nitinol coil, 138 Threaded section, 140 Central opening, C11 First coil of type 1, C21 Second coil of type 1, C12 First coil of type 2, C22 Second coil of type 2, C13 First coil of type 3, C23 Second coil of type 3, P11 First pad of type 1, P21 Second pad of type 1, P31 Third pad of type 1, P12Type 2 first pad, P22; Type 2 second pad, P32; Type 2 third pad, P13; Type 3 first pad, P23; Type 3 second pad, P14; Type 4 first pad, P24; Type 4 second pad, P15; Type 5 first pad, P25; Type 5 second pad, RA rotation axis.

Claims

1. A pumping section (12) having a first blood flow opening (14) and a second blood flow opening (16), A pump element (18) is at least partially located within the pumping section (12), A drive unit (20) having a rotor (22) and a stator (24), wherein the stator (24) includes a first coil assembly (26) and a second coil assembly (28), A circuit board (32) having a first pad of a first type (P11), a second pad of a first type (P21), a first pad of a second type (P12), and a second pad of a second type (P22), wherein the first pad of a second type (P12) and the second pad of a second type (P22) are spaced apart from each other on the circuit board (32), the first pad of a second type (P12) is electrically connected to the second pad of a second type (P22) by a first bridge (34), the first coil assembly (26) is connected to the first pad of a first type (P11) and the first pad of a second type (P12), and the second coil assembly (28) is connected to the second pad of a first type (P21) and the second pad of a second type (P22), A first cable (42) is attached to the first pad (P11) of the first type, A second cable (44) is attached to the second pad (P21) of the first type, A blood pump (10) comprising, The blood pump (10) is characterized in that the first cable (42) and the second cable (44) are configured to rotate the rotor (22) so that blood flow is generated between the first blood flow opening (14) and the second blood flow opening (16), and to apply electrical signals to the first coil assembly (26) and the second coil assembly (28) to drive the pump element (18).

2. A blood pump (10) according to claim 1, The first coil assembly (26) includes a first coil (C11) of the first type and a second coil (C21) of the first type, the circuit board (32) includes a first pad (P13) of the third type and a second pad (P23) of the third type, the first pad (P13) of the third type and the second pad (P23) of the third type are spaced apart from each other on the circuit board (32), the first pad (P13) of the third type is electrically connected to the second pad (P23) of the third type by a second bridge (36), and the first coil (C11) of the first type is A blood pump (10) characterized in that the first coil (C21) of the first type is connected to the first pad (P11) of the first type to establish a connection between the first coil assembly (26) and the first pad (P11) of the first type, the second coil (C21) of the first type is connected to the first pad (P12) of the second type to establish a connection between the first coil assembly (26) and the first pad (P12) of the second type, the first coil (C11) of the first type is connected to the first pad (P13) of the third type, and the second coil (C21) of the first type is connected to the second pad (P23) of the third type.

3. A blood pump (10) according to claim 1 or 2, The second coil assembly (28) includes a first coil of the second type (C12) and a second coil of the second type (C22), the circuit board (32) includes a first pad of the fourth type (P14) and a second pad of the fourth type (P24), the first pad of the fourth type (P14) and the second pad of the fourth type (P24) are spaced apart from each other on the circuit board (32), the first pad of the fourth type (P14) is electrically connected to the second pad of the fourth type (P24) by a third bridge (38), and the first coil of the second type (C12) is the first A blood pump (10) characterized in that the second coil (C22) of the second type is connected to the second pad (P21) of the first type to establish a connection between the second coil assembly (28) and the second pad (P21) of the first type, the second coil (C22) of the second type is connected to the second pad (P22) of the second type to establish a connection between the second coil assembly (28) and the second pad (P22) of the second type, the first coil (C12) of the second type is connected to the first pad (P14) of the fourth type, and the second coil (C22) of the second type is connected to the second pad (P24) of the fourth type.

4. A blood pump (10) according to any one of claims 1 to 3, The stator (24) includes a third coil assembly (30), the circuit board (32) includes a first type third pad (P31) and a second type third pad (P32), the second type first pad (P12), the second type second pad (P22), and the second type third pad (P32) are spaced apart from each other on the circuit board (32), the second type third pad (P32) is electrically connected to the second type first pad (P12) and the second type second pad (P22) by the first bridge (34), and the third coil assembly (30) is connected to the first type third pad (P31) and the second type third pad (P32), The blood pump (10) is The first type further comprises a third cable (46) attached to the third pad (P31), The blood pump (10) is characterized in that the third cable (46) is configured to apply an electrical signal to the third coil assembly (30).

5. A blood pump (10) according to claim 4, The third coil assembly (30) includes a first coil (C13) of the third type and a second coil (C23) of the third type, and the circuit board (32) includes a first pad (P15) of the fifth type and a second pad (P25) of the fifth type, the first pad (P15) of the fifth type and the second pad (P25) of the fifth type are spaced apart from each other on the circuit board (32), the first pad (P15) of the fifth type is electrically connected to the second pad (P25) of the fifth type by a fourth bridge (40), and the first coil (C13) of the third type is A blood pump characterized in that the third pad (P31) of type 1 is connected to the third coil assembly (30) and the third pad (P31) of type 1, the second coil (C23) of type 3 is connected to the third pad (P32) of type 2, establishing a connection between the third coil assembly (30) and the third pad (P32) of type 2, the first coil (C13) of type 3 is connected to the first pad (P15) of type 5, and the second coil (C23) of type 3 is connected to the second pad (P25) of type 5.

6. A blood pump (10) according to any one of claims 1 to 5, The blood pump (10) is characterized in that the circuit board (32) includes a first layer (48) having a first side surface (50) and a second side surface (52), the first type first pad (P11), the first type second pad (P21), the second type first pad (P12), and the second type second pad (P22) are arranged on the first side surface (50) of the first layer (48), and the first bridge (34) is arranged on the second side surface (52) of the first layer (48).

7. A blood pump (10) according to claim 6, A blood pump (10) characterized in that the first layer (48) includes a first opening (60) and a second opening (62), the circuit board (32) includes a first connector (64) and a second connector (66), the first connector (64) extending through the first opening (60), the second connector (66) extending through the second opening (62), the first bridge (34) connected to the first connector (64) and the second connector (66), the first pad (P12) of the second type connected to the first connector (64), and the second pad (P22) of the second type connected to the second connector (66).

8. A blood pump (10) according to claim 6 or 7, A blood pump (10) characterized in that the third pad (P31) of the first type and the third pad (P32) of the second type are arranged on the first side surface (50) of the first layer (48), the first layer (48) includes a third opening (68), the circuit board (32) includes a third connector (70) extending through the third opening (68), the first bridge (34) is connected to the third connector (70), and the third pad (P32) of the second type is connected to the third connector (70).

9. A blood pump (10) according to any one of claims 6 to 8, The blood pump (10) is characterized in that the circuit board (32) includes a second layer (54) having a first side surface (56) and a second side surface (58), and the first bridge (34) is positioned on the first side surface (56) of the second layer (54).

10. A blood pump (10) according to any one of claims 6 to 9, A blood pump (10) characterized in that the third type of the first pad (P13) and the third type of the second pad (P23) are arranged on the first side surface (50) of the first layer (48), and / or the fourth type of the first pad (P14) and the fourth type of the second pad (P24) are arranged on the first side surface (50) of the first layer (48), and / or the fifth type of the first pad (P15) and the fifth type of the second pad (P25) are arranged on the first side surface (50) of the first layer (48).

11. A blood pump (10) according to claim 9 or 10, The second bridge (36) is located on the second side surface (58) of the second layer (54), the first layer (48) includes a fourth opening (72) and a fifth opening (74), the second layer (54) includes a sixth opening (76) and a seventh opening (78), the circuit board (32) includes a fourth connector (80) and a fifth connector (82), the fourth connector (80) passes through the fourth opening (72) and the sixth opening (76) A blood pump (10) characterized in that the fifth connector (82) extends through the fifth opening (74) and the seventh opening (78), the second bridge (36) is connected to the fourth connector (80) and the fifth connector (82), the first pad (P13) of the third type is connected to the fourth connector (80), and the second pad (P23) of the third type is connected to the fifth connector (82).

12. A blood pump (10) according to any one of claims 9 to 11, The third bridge (38) is located on the second side surface (58) of the second layer (54), the first layer (48) includes an eighth opening (84) and a ninth opening (86), the second layer (54) includes a tenth opening (88) and an eleventh opening (90), the circuit board (32) includes a sixth connector (92) and a seventh connector (94), the sixth connector (92) passes through the eighth opening (84) and the tenth opening (88). A blood pump (10) characterized in that the seventh connector (94) extends through the ninth opening (86) and the eleventh opening (90), the third bridge (38) is connected to the sixth connector (92) and the seventh connector (94), the first pad (P14) of the fourth type is connected to the sixth connector (92), and the second pad (P24) of the fourth type is connected to the seventh connector (94).

13. A blood pump (10) according to any one of claims 9 to 12, The fourth bridge (40) is located on the second side surface (58) of the second layer (54), the first layer (48) includes a twelfth opening (96) and a thirteenth opening (98), the second layer (54) includes a fourteenth opening (100) and a fifteenth opening (102), the circuit board (32) includes an eighth connector (104) and a ninth connector (106), the eighth connector (104) includes the twelfth opening (96) and the fourteenth opening (100) A blood pump (10) characterized in that the ninth connector (106) extends through the thirteenth opening (98) and the fifteenth opening (102), the fourth bridge (40) is connected to the eighth connector (104) and the ninth connector (106), the first pad (P15) of the fifth type is connected to the eighth connector (104), and the second pad (P25) of the fifth type is connected to the ninth connector (106).

14. A blood pump (10) according to any one of claims 1 to 13, wherein the circuit board (32) includes an adhesive foil (108) on the side opposite to the first side surface (50) of the first layer (48), preferably on the second side surface (58) of the second layer (54).

15. A blood pump (10) according to any one of claims 1 to 14, The blood pump (10) is characterized in that the pads (P11 to P25) are arranged in an annular pattern on the circuit board (32), and at least one pad of a different type is arranged between two pads of the same type, and especially between all of the pads.

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