Blood pumping device and motor

Abstract

The utility model discloses a blood pumping device and a motor, the blood pumping device is used for conveying blood, the blood pumping device comprises the motor, a first pipeline and a second pipeline, the motor comprises a stator assembly and a rotor assembly, a containing cavity is formed in the stator assembly, at least part of the rotor assembly is located in the containing cavity, and the rotor assembly comprises a rotating shaft capable of rotating relative to the stator assembly; a first circulation cavity is formed in the rotating shaft, and a second circulation cavity communicating with the first circulation cavity is formed in the containing cavity; the first pipeline is communicated with the first circulation cavity; one of the first pipeline and the second pipeline is a perfusion pipeline, the other one of the first pipeline and the second pipeline is a backflow pipeline, the perfusion pipeline is used for conveying perfusion liquid into the motor, and the backflow pipeline is used for discharging the perfusion liquid in the motor.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and in particular to a blood pumping device and a motor. Background Art

[0002] During cardiac surgery, due to the patient's own disease or the need for surgery, the patient's heart function becomes weak and the blood pumping capacity is insufficient. At this time, it is necessary to insert an active interventional medical device such as a ventricular assist device into the heart to assist the heart in pumping blood. The existing ventricular assist device uses the principle of heart pumping blood to pump the blood out of the heart through the pumping mechanism and guide the blood to the aorta outside the heart to flow to the whole body.

[0003] In some scenarios, the existing ventricular assist device includes a catheter and a blood pumping device. The blood pumping device is arranged at the distal end of the catheter (the end away from the operator or physician). The blood pumping device can be inserted through the femoral artery, axillary artery or carotid artery by pushing the catheter. At this time, the suction window of the ventricular assist device is located in the left ventricle, and the outflow window is located in the aorta. When the blood pumping device is started, the blood in the left ventricle is pumped into the aorta through the suction window and the outflow window, thereby realizing the blood pumping function of the ventricular assist device. Similarly, the blood pumping device can also be inserted through veins such as the femoral vein by pushing the catheter.

[0004] When the blood pumping device is in operation, heat is generated, and if the blood pumping device heats up too much, it may cause harm to the patient. Utility Model Content

[0005] The embodiments of the present application provide a blood pumping device and a motor, which can improve the effective heat dissipation of the blood pumping device and the motor.

[0006] A first aspect of the present application provides a blood pumping device, which includes a motor, a first pipeline and a second pipeline. The motor includes a stator assembly and a rotor assembly. The stator assembly is provided with a accommodating chamber, and at least part of the rotor assembly is located in the accommodating chamber. The rotor assembly includes a rotating shaft that can rotate relative to the stator assembly, and the rotating shaft is provided with a first circulation chamber. The accommodating chamber is provided with a second circulation chamber connected to the first circulation chamber; the first pipeline is connected to the first circulation chamber; the second pipeline is connected to the second circulation chamber, one of the first pipeline and the second pipeline is a perfusion pipeline, and the other is a reflux pipeline. The perfusion pipeline is used to transport perfusion liquid to the motor, and the reflux pipeline is used to discharge the perfusion liquid in the motor.

[0007] According to an implementation of the first aspect of the present application, the first circulation cavity includes a distal opening and a proximal opening, the distal opening is located on the circumferential surface of the rotating shaft, the proximal opening is located on the proximal end surface of the rotating shaft, the proximal opening is connected to the second pipe, and the distal opening is connected to the second circulation cavity.

[0008] According to the implementation scheme of the first aspect of the present application, the motor also includes: a distal bearing, which is sleeved on the rotating shaft; a proximal bearing, which is sleeved on the rotating shaft, and the rotating shaft is rotatably connected to the stator assembly through the distal bearing and the proximal bearing, the distal bearing is located on the side of the proximal bearing away from the first pipe, and the distal opening is located on the side of the distal bearing away from the proximal bearing.

[0009] According to an implementation scheme of the first aspect of the present application, the motor further includes: a distal cover connected to the distal end of the stator assembly, the distal cover being provided with a first through hole penetrating the distal cover along the axial direction of the rotating shaft, at least a portion of the rotating shaft extending out of the accommodating cavity from the first through hole, the distal cover being used to seal the distal end of the accommodating cavity; a proximal cover connected to the proximal end of the stator assembly, the proximal cover being used to seal the proximal end of the accommodating cavity, the proximal cover being provided with a second through hole and a third through hole, the second through hole being used to connect the first circulation cavity with the first pipe, and the third through hole being used to connect the second circulation cavity with the second pipe.

[0010] According to the implementation of the first aspect of the present application, the second through hole and the third through hole penetrate the proximal cover along the axial direction of the rotating shaft, and at least part of the first pipeline extends from the second through hole into the accommodating cavity and communicates with the proximal opening.

[0011] According to the implementation scheme of the first aspect of the present application, the motor also includes: a proximal bearing seat, the proximal bearing seat is connected to the proximal end of the stator assembly, the proximal bearing seat is provided with a first mounting hole that passes through the proximal bearing seat along the axial direction of the rotating shaft, and the proximal bearing is embedded in the first mounting hole; a distal bearing seat, the distal bearing seat is connected to the distal end of the stator assembly, the distal bearing seat is provided with a second mounting hole that passes through the distal bearing seat along the axial direction of the rotating shaft, and the distal bearing is embedded in the second mounting hole.

[0012] According to the implementation of the first aspect of the present application, the proximal cover is embedded in the first mounting hole, and the proximal cover is located on the side of the proximal bearing facing away from the distal bearing.

[0013] According to the implementation of the first aspect of the present application, a sealing gasket is further provided in the first mounting hole, and the sealing gasket is located between the proximal cover and the proximal bearing.

[0014] According to the implementation scheme of the first aspect of the present application, the rotor assembly also includes a magnet located in the accommodating cavity, the magnet is sleeved on the rotating shaft and rotates synchronously with the rotating shaft; the stator assembly includes a winding and an iron core, the winding is sleeved outside the magnet, the iron core is sleeved outside the winding, and the gap between the winding and the rotor assembly forms a second flow cavity; and / or the first pipe is an infusion pipe, and the second pipe is a return pipe.

[0015] A second aspect of the present application provides a motor, which includes a stator assembly and a rotor assembly, wherein a accommodating chamber is provided in the stator assembly, and at least part of the rotor assembly is located in the accommodating chamber. The rotor assembly includes a rotating shaft that can rotate relative to the stator assembly, wherein a first circulation chamber is provided in the rotating shaft, and a second circulation chamber connected to the first circulation chamber is provided in the accommodating chamber. One of the first circulation chamber and the second circulation chamber is used to communicate with an infusion pipe, and the other is used to communicate with a return pipe. The infusion pipe is used to transport infusion liquid into the motor, and the return pipe is used to discharge the infusion liquid in the motor.

[0016] It is understood that the motor provided in the second aspect of the present application can be any motor in the blood pumping device provided in the first aspect of the present application, and will not be described repeatedly here. The motor can be used in various application scenarios such as pumping blood, pumping tissue fluid, and pumping digestive fluid.

[0017] The blood pumping device of the embodiment of the present application includes a motor, a first pipeline and a second pipeline. The motor includes a stator assembly and a rotor assembly. The stator assembly is provided with a receiving chamber, at least part of the rotor assembly is located in the receiving chamber, the rotor assembly includes a rotating shaft that can rotate relative to the stator assembly, the rotating shaft is provided with a first circulation chamber, and the receiving chamber is provided with a second circulation chamber connected to the first circulation chamber; the first pipeline is connected to the first circulation chamber; the second pipeline is connected to the second circulation chamber, one of the first pipeline and the second pipeline is a perfusion pipeline, and the other is a return pipeline. The perfusion pipeline is used to transport perfusion liquid into the motor, and the return pipeline is used to discharge the perfusion liquid in the motor. The present application is connected to the inside of the motor through the first pipeline and the second pipeline. After the perfusion liquid flows to the motor through one of the pipelines, it flows through the first circulation chamber and the second circulation chamber and takes away the heat generated by the motor, and then flows out from the other pipeline, thereby improving the effective heat dissipation of the blood pumping device and the motor, and reducing the damage caused to the patient by the blood pumping device. By setting the first circulation chamber connected to the first pipeline in the rotating shaft, there is no need to set up another pipeline outside the motor, reducing the outer diameter of the motor, and thus reducing the difficulty of intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic diagram of the structure of a ventricular assist device including a blood pumping device according to some embodiments of the present application;

[0020] Figure 2 An example is shown Figure 1 A schematic diagram of the longitudinal cross-sectional structure of a ventricular assist device in FIG.

[0021] Figure 3A schematic cross-sectional structure diagram of an exemplary rotating shaft is shown;

[0022] Figure 4 Another example is shown Figure 1 A schematic diagram of the longitudinal cross-sectional structure of a ventricular assist device in FIG.

[0023] Figure 5 A schematic diagram showing the structure of an exemplary distal end cover;

[0024] Figure 6 A schematic cross-sectional view of an exemplary proximal end cover is shown;

[0025] Figure 7 A schematic cross-sectional view of an exemplary proximal end cover and an irrigation tube is shown;

[0026] Figure 8 A schematic diagram showing the structure of an exemplary second pipeline;

[0027] Fig. 9 Another example is shown Figure 1 A schematic diagram of the cross-sectional structure of a ventricular assist device in FIG.

[0028] Fig.10 A schematic cross-sectional view of an exemplary proximal bearing seat is shown.

[0029] Reference numerals:

[0030] 10. Motor; 11. Stator assembly; 111. Accommodating cavity; 1111. Second circulation cavity; 112. Winding; 113. Iron core; 12. Rotor assembly; 121. Rotating shaft; 1211. First circulation cavity; 1212. Distal opening; 1213. Proximal opening; 122. Magnetic steel; 13. Distal bearing; 14. Proximal bearing; 15. Distal cover; 151. First through hole; 16. Proximal cover; 161. Second through hole; 162. Third through hole; 17. Proximal bearing seat; 171. First mounting hole; 172. First step surface; 173. Second step surface; 174. Third step surface; 175. Sealing pad; 176. Fourth step surface; 177. Fifth step surface; 178. Sixth step surface; 18. Distal bearing seat; 181. Second mounting hole; 19. Third circulation cavity;

[0031] 20. First pipeline;

[0032] 30. Second pipeline; 31. Notch;

[0033] 40. outflow channel; 41. outflow window; 42. impeller;

[0034] 50. Interventional catheter;

[0035] x, axial direction of the rotating shaft. DETAILED DESCRIPTION

[0036] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0038] In order to solve the technical problems raised in the background technology, the applicant proposes a blood pumping device for conveying blood, the blood pumping device includes a motor, a first pipeline and a second pipeline, the motor includes a stator assembly and a rotor assembly, the stator assembly is provided with a receiving chamber, at least part of the rotor assembly is located in the receiving chamber, the rotor assembly includes a rotating shaft that can rotate relative to the stator assembly, the rotating shaft is provided with a first circulation chamber, the receiving chamber is provided with a second circulation chamber connected to the first circulation chamber; the first pipeline is connected to the first circulation chamber; the second pipeline is connected to the second circulation chamber. One of the first pipeline and the second pipeline is a perfusion pipeline, and the other is a return pipeline. The perfusion pipeline is used to convey perfusion liquid into the motor, and the return pipeline is used to discharge the perfusion liquid in the motor.

[0039] The blood pumping device provided by the present application is connected to the inside of the motor through the first pipeline and the second pipeline. The perfusion fluid flows to the motor through one of the pipelines, then flows through the first circulation cavity and the second circulation cavity and takes away the heat generated by the motor, and then flows out from the other pipeline, thereby improving the effective heat dissipation of the blood pumping device and the motor and reducing the damage caused by the blood pumping device to the patient. By setting the first circulation cavity connected to the first pipeline in the rotating shaft, there is no need to set up another pipeline outside the motor, reducing the outer diameter of the motor, and thus reducing the difficulty of intervention.

[0040] It can be understood that the motor in the present application can be used in application scenarios such as blood pumping devices, tissue fluid pumping devices, digestive fluid pumping devices, etc., to achieve the purpose of pumping blood, tissue fluid, digestive fluid and other fluids. For the sake of ease of understanding and description, the following will continue to describe the application scenario of the motor in a blood pumping device as an example.

[0041] Before describing the specific structure of the blood pumping device, a ventricular assist device including the blood pumping device is briefly described with reference to the accompanying drawings so as to understand the working environment of the blood pumping device. Figure 1 This is a schematic diagram of the structure of a ventricular assist device including a blood pumping device according to some embodiments of the present application. Figure 2 An example is shown Figure 1 Schematic diagram of the longitudinal cross-section structure of the ventricular assist device in the Figure 1 and Figure 2 It can be seen that the present application provides a ventricular assist device including a blood pumping device, the ventricular assist device includes a blood pumping device (not shown), an outflow channel 40 and an interventional catheter 50, the interventional catheter 50 is connected to the proximal end of the blood pumping device, and the outflow channel 40 is connected to the distal end of the blood pumping device. The blood pumping device includes a motor 10, and the outflow channel 40 is provided with an intake window (not shown) and an outflow window 41. During use, the blood pumping device and the outflow channel 40 rely on the push of the interventional catheter 50 to pass through the patient's blood vessels until the blood pumping device and the outflow channel 40 are located at designated positions of the patient's blood circulation system. At this time, the outflow window 41 and the intake window are located at different positions of the blood circulation system. When the motor 10 in the blood pumping device is started, the motor 10 drives the blood to enter the outflow channel 40 from the intake window and flow out from the outflow window 41, thereby realizing the blood pumping function of the ventricular assist device.

[0042] When the blood pumping device, the interventional catheter 50 and the outflow channel 40 are inserted into the patient's body, the end of the interventional catheter 50 away from the motor 10 extends out of the patient's body and is connected to a fluid storage tank (not shown), a power supply device, a control switch and other equipment, and at least part of the first pipe 20 and the second pipe 30 are located in the interventional catheter 50. The fluid storage tank transports and discharges the perfusion fluid to the inside of the motor through the pipeline. The perfusion fluid flows through the motor 10 and takes away the heat generated when the motor 10 is running. Among them, the perfusion fluid includes physiological saline and an anticoagulant, and the anticoagulant can be heparin. The anticoagulant in the perfusion fluid reduces the probability of blood coagulation, thereby reducing the probability of failure of the blood pumping function of the motor 10 due to coagulation.

[0043] It is understood that in this application, the proximal end refers to the end facing the operator or physician, and the distal end refers to the end away from the operator or physician. The proximal end of the motor 10 faces the interventional catheter 50 , and the distal end of the motor 10 faces the outflow channel 40 .

[0044] After describing the structure of the ventricular assist device, the blood pumping device provided by the embodiment of the present application is introduced below in conjunction with the accompanying drawings. It is noted that in the accompanying drawings, the direction extending along the line connecting the proximal end and the distal end of the stator assembly and pointing from the distal end to the proximal end is the first direction. It can be understood that the first direction can also be expressed as the axial direction of the rotating shaft, which is denoted as x. In the accompanying drawings, for the convenience of drawing, the dimensions in the drawings are not necessarily proportional to the actual dimensions.

[0045] Combination Figure 1 and Figure 2 It can be seen that the present application provides a blood pumping device for conveying blood, the blood pumping device includes a motor 10, a first pipeline 20 and a second pipeline 30, the motor 10 includes a stator assembly 11 and a rotor assembly 12, the stator assembly 11 is provided with a receiving chamber 111, at least part of the rotor assembly 12 is located in the receiving chamber 111, the rotor assembly 12 includes a rotating shaft 121 that can rotate relative to the stator assembly 11, the rotating shaft 121 is provided with a first circulation chamber 1211 that is connected to the receiving chamber 111, and the receiving chamber 111 is provided with a second circulation chamber 1111 that is connected to the first circulation chamber 1211. The first pipeline 20 is connected to the first circulation chamber 1211, and the second pipeline 30 is connected to the second circulation chamber 1111. One of the first pipeline 20 and the second pipeline 30 is a perfusion pipeline, and the other is a return pipeline. Among them, the perfusion pipeline is used to convey perfusion liquid into the motor 10, and the return pipeline is used to discharge the perfusion liquid in the motor 10. The accommodating chamber 111 is formed by enclosing the stator assembly 11 . After removing part of the rotor assembly 12 and other components from the accommodating chamber 111 , the remaining chamber is the second flow chamber 1111 .

[0046] In some implementations, the wall surface of the first flow cavity 1211 has high smoothness and low roughness, and the wall surface of the first flow cavity 1211 is treated with a hydrophilic coating.

[0047] In some embodiments, the first circulation cavity 1211 and the second circulation cavity 1111 are directly connected or indirectly connected, and the indirect connection means that the first circulation cavity 1211 and the second circulation cavity 1111 are connected through at least one other cavity, gap or space structure. This embodiment is described in the application scenario that the first circulation cavity 1211 and the second circulation cavity 1111 are indirectly connected.

[0048] The blood pumping device provided in this embodiment is connected to the motor 10 through the first pipe 20 and the second pipe 30. The perfusion fluid flows to the motor 10 through one of the pipes, then flows through the first circulation cavity 1211 and the second circulation cavity 1111 and takes away the heat generated by the motor 10, and then flows out from the other pipe, thereby improving the effective heat dissipation of the blood pumping device and the motor 10 and reducing the damage caused by the blood pumping device to the patient. By setting the first circulation cavity 1211 connected to the first pipe 20 in the rotating shaft 121, there is no need to set up another pipeline outside the motor, reducing the outer diameter of the motor 10, and thus reducing the difficulty of intervention.

[0049] After describing the overall structure of the blood pumping device, the specific structure of the first circulation cavity in the blood pumping device will be described below with reference to the accompanying drawings. Figure 3 A cross-sectional structural diagram of an exemplary rotating shaft is shown. Figure 2 and Figure 3 It can be seen that in some embodiments, the first flow cavity 1211 includes a distal opening 1212 and a proximal opening 1213, the distal opening 1212 is located on the circumferential surface of the rotating shaft 121, the proximal opening 1213 is located on the proximal end surface of the rotating shaft 121, and the distal opening 1212 is communicated with the accommodating cavity 111. The proximal end of the motor 10 faces the interventional catheter 50, and the distal end of the motor 10 faces the outflow channel 40. The distal opening 1212 is located on the side of the proximal opening 1213 away from the interventional catheter 50.

[0050] In some embodiments, the distal opening 1212 is directly or indirectly connected to the second circulation cavity 1111, and the indirect connection means that the distal opening 1212 and the second circulation cavity 1111 are connected through at least one other cavity, gap or space structure. This embodiment is described in the application scenario that the distal opening 1212 and the second circulation cavity 1111 are indirectly connected.

[0051] It is explained here that since the rotating shaft 121 is an axisymmetric figure, the axial direction of the rotating shaft 121 refers to the direction in which the central axis extends, that is, the direction x in the figure. The circumferential direction of the rotating shaft 121 refers to the circumferential direction of the outer periphery of the shaft body, and the circumferential surface of the rotating shaft 121 refers to the outer circumferential surface of the rotating shaft 121 facing the stator assembly 11. The radial direction refers to the direction passing through the central axis in the radial plane, and usually also refers to the straight line direction along the diameter or radius, or the straight line direction perpendicular to the central axis. The radial dimension generally refers to the radius or diameter of an axisymmetric part. It can be understood that in this application, the axial, circumferential, radial, and circumferential surfaces of other components can refer to the relevant description of the rotating shaft 121 mentioned above. It is worth noting that some components are cylindrical structures, then these components have two circumferential surfaces, the circumferential surface of the outer wall of the cylinder is the outer circumferential surface, and the circumferential surface of the inner wall of the cylinder is the inner circumferential surface.

[0052] In some embodiments, the first conduit 20 is axially aligned with the proximal opening 1213 and sealedly docked. The blood pumping device provided in this embodiment enables the second circulation cavity 1111 and the first conduit 20 to communicate through the distal opening 1212 and the proximal opening 1213 on the first circulation cavity 1211 by making the first circulation cavity 1211 include the distal opening 1212 and the proximal opening 1213. By making the proximal opening 1213 located on the proximal end surface of the rotating shaft 121, the proximal opening 1213 can be directly formed when the first circulation cavity 1211 is processed along the axial direction x of the rotating shaft 121, thereby simplifying the processing technology. By making the distal opening 1212 located on the circumferential surface of the rotating shaft 121, it is avoided that the first circulation cavity 1211 passes through the rotating shaft 121, and it is ensured that the distal opening 1212 can be located in the accommodating cavity 111 and communicate with the second circulation cavity 1111.

[0053] After describing the implementation of the first circulation chamber in the blood pumping device, several implementations of the second circulation chamber in the blood pumping device will be described below in conjunction with the accompanying drawings. In some embodiments, the rotor assembly 12 also includes a magnetic steel 122 located in the accommodating chamber 111, and the magnetic steel 122 is sleeved on the rotating shaft 121 and rotates synchronously with the rotating shaft 121. The stator assembly 11 includes a winding 112 and an iron core 113, the winding 112 is sleeved outside the magnetic steel 122, and the iron core 113 is sleeved outside the winding 112, and the gap between the winding 112 and the rotor assembly 12 forms a second circulation chamber 1111.

[0054] In some embodiments, the winding 112 and the iron core 113 may be a cylinder, or a polygonal cylindrical structure such as a square cylinder. This embodiment is illustrated by taking the winding 112 and the iron core 113 as cylinders. The accommodating cavity 111 is formed by the winding 112 surrounding and enclosing the accommodating cavity 111, and the accommodating cavity 111 is used to accommodate the magnetic steel 122, the bearing and other components, and the cavity remaining after removing the space occupied by the magnetic steel 122, the bearing and other components from the accommodating cavity 111 is the second flow cavity 1111.

[0055] Figure 4 Another example is shown Figure 1 Schematic diagram of the longitudinal cross-sectional structure of the ventricular assist device in FIG.

[0056] in, Figure 4 The ventricular assist device in the patient hides the interventional catheter.

[0057] Combination Figures 1 to 4It can be seen that in some embodiments, the motor 10 further includes a distal bearing 13 and a proximal bearing 14, both of which are sleeved on the rotating shaft 121, and the rotating shaft 121 is rotatably connected to the stator assembly 11 through the distal bearing 13 and the proximal bearing 14. The distal bearing 13 is located on the side of the proximal bearing 14 away from the first pipeline 20. The first circulation cavity 1211 and the second circulation cavity 1111 are connected through the distal bearing 13, and the second circulation cavity 1211 and the second pipeline 30 are connected through the proximal bearing 14.

[0058] In some embodiments, the distal bearing 13 and the proximal bearing 14 may be sliding bearings or ball bearings. In some implementations, the distal bearing 13 and the proximal bearing 14 are ball bearings, and gaps are provided on the distal bearing 13 and the proximal bearing 14 for allowing the perfusion liquid to pass through, such as the gaps between the balls, and the perfusion liquid located on both sides of the bearing axial direction can flow through the gaps on the bearings. For example, the perfusion liquid flowing into the accommodating chamber 111 from the distal opening 1212 passes through the distal bearing 13 and the proximal bearing 14 in sequence and then flows out from the second pipe 30, or the perfusion liquid flowing into the second pipe 30 passes through the proximal bearing 14 and the distal bearing 13 in sequence and then flows out from the distal opening 1212 and the proximal opening 1213. In some other alternative implementations, the distal bearing 13 and the proximal bearing 14 are sliding bearings, and the distal bearing 13 and other components (such as the bearing seat) form a gap allowing the perfusion liquid to pass through, and the proximal bearing 14 and other components (such as the bearing seat) form a gap allowing the perfusion liquid to pass through. In some other alternative implementations, one of the distal bearing 13 and the proximal bearing 14 is a ball bearing, and the other is a sliding bearing. The specific solution may be a fusion of the first two implementations.

[0059] In the blood pumping device provided in this embodiment, when the perfusion fluid flows through the distal bearing 13 and / or the proximal bearing 14 , it can carry away particles generated when the bearings rotate, thereby reducing bearing wear and further increasing the life of the motor 10 .

[0060] Figure 5 A schematic diagram of the structure of an exemplary distal end cover is shown. Figure 4 and Figure 5 It can be seen that in some embodiments, the motor 10 further includes a distal cover 15 and a proximal cover 16, wherein the distal cover 15 is connected to the distal end of the stator assembly 11, and the proximal cover 16 is connected to the proximal end of the stator assembly 11. The distal cover 15 is provided with a first through hole 151 penetrating the distal cover 15 along the axial direction x of the rotating shaft 121, and at least a portion of the rotating shaft 121 extends out of the accommodating cavity 111 from the first through hole 151. The distal opening 1212 is located between the distal cover 15 and the distal bearing 13, and the distal cover 15 is used to seal the distal end of the accommodating cavity 111, and the proximal cover 16 is used to seal the proximal end of the accommodating cavity 111.

[0061] In some of the embodiments, the distal end of the distal cover 15 has a conical streamlined surface. In the working state, the conical streamlined surface can be used as a blood flow surface.

[0062] In some of the embodiments, an impeller 42 is provided in the outflow channel 40 in the blood pumping device, and the rotating shaft 121 extends from the first through hole 151 to the accommodating chamber 111 and is connected to the impeller 42. When the motor 10 is started, the rotating shaft 121 drives the impeller 42 to rotate, and when the impeller 42 rotates, the blood is pumped from the suction window to the outflow window 41 and the blood pumping function is realized.

[0063] Figure 6 A schematic cross-sectional view of an exemplary proximal cover is shown. Figure 7 A schematic cross-sectional view of an exemplary proximal cover and an irrigation tube is shown.

[0064] Combination Figure 4 , Figure 6 and Figure 7 It can be seen that in some of the embodiments, the proximal cover 16 is provided with a second through hole 161 and a third through hole 162 , the second through hole 161 is used to connect the first circulation cavity 1211 with the first pipe 20 , and the third through hole 162 is used to connect the second circulation cavity 1111 with the second pipe 30 .

[0065] In some embodiments, the materials of the proximal cover 16 and the distal cover 15 include metal and non-metal, preferably 316 stainless steel.

[0066] In some of the embodiments, the connection between the first pipe 20, the second pipe 30 and the proximal cover 16 can be welded, glued or other sealed methods.

[0067] In some of the embodiments, the second through hole 161 and the third through hole 162 penetrate the proximal cover 16 along the axial direction x of the rotating shaft 121 .

[0068] In some embodiments, part of the first pipe 20 extends from the second through hole 161 into the accommodating cavity 111 and then extends from the proximal opening 1213 into the first circulation cavity 1211. By extending part of the first pipe 20 into the first circulation cavity 1211 from the proximal opening 1213, the contact area between the first pipe 20 and the inner circumference of the rotating shaft 121 is increased, and the probability of the first pipe 20 being separated from the first circulation cavity 1211 is reduced.

[0069] Figure 8 A schematic diagram of the structure of a second pipeline of an example is shown.

[0070] Combination Figure 8It can be seen that in some of the embodiments, the first pipe 20 and the second pipe 30 can be straight tubes or other special-shaped tubes, and the present application does not make specific limitations on this. In addition, for the return pipe, a notch 31 is provided at the proximal end of the return pipe, and the number of the notches 31 can be at least one. When the number of notches 31 is two or more, the plurality of notches 31 are symmetrically or asymmetrically arranged along the circumferential direction. The notch 31 is used to connect with a support wire (not shown) at least partially located in the return pipe. After the support wire is embedded in the notch 31, it is connected to the return pipe by laser welding or gluing at the embedded position, thereby further improving the connection strength between the return pipe and the motor 10.

[0071] Fig. 9 Another example is shown Figure 1 Schematic diagram of the cross-sectional structure of the ventricular assist device. Fig.10 A cross-sectional structural diagram of an exemplary proximal bearing seat is shown. Fig. 9 The VAD in Figure 1 conceals the proximal cap, seal, perfusion tubing, and return tubing.

[0072] Combination Figure 4 , Fig. 9 and Fig.10 It can be seen that in some embodiments, the motor 10 further includes a proximal bearing seat 17 and a distal bearing seat 18, at least part of the proximal bearing seat 17 and at least part of the distal bearing seat 18 are located in the accommodating cavity 111, the proximal bearing seat 17 is connected to the proximal end of the stator assembly 11, the proximal bearing seat 17 is provided with a first mounting hole 171 that penetrates the proximal bearing seat 17 along the axial direction x of the rotating shaft 121, the proximal bearing 14 is sleeved on the rotating shaft 121 and embedded in the first mounting hole 171. The distal bearing seat 18 is connected to the distal end of the stator assembly 11, the distal bearing seat 18 is provided with a second mounting hole 181 that penetrates the distal bearing seat 18 along the axial direction x of the rotating shaft 121, the distal bearing 13 is sleeved on the rotating shaft 121 and embedded in the second mounting hole 181.

[0073] It can be understood that the proximal bearing 14 is embedded in the first mounting hole 171 means that the outer circumferential surface of the proximal bearing 14 is embedded in the circumferential surface of the proximal bearing seat 17 facing the first mounting hole 171 and is fixedly connected. At the same time, the inner circumferential surface of the proximal bearing 14 is sleeved on the rotating shaft 121 and is fixedly connected to the rotating shaft 121. The distal bearing 13 is the same.

[0074] In the axial direction x of the rotating shaft 121, there is a gap between the distal cover 15 and the distal bearing seat 18 to form a third circulation chamber 19, and the third circulation chamber 19 is directly or indirectly connected to the first circulation chamber 1211 and the second circulation chamber 1111. The two end faces of the distal bearing 13 in the axial direction x of the rotating shaft 121 are respectively facing the second circulation chamber 1111 and the third circulation chamber 19. The distal opening 1212 is located between the distal bearing 13 and the distal cover 15, and the first circulation chamber 1211 is connected to the first pipeline 20 and the third circulation chamber 19.

[0075] The radial dimension of the first through hole 151 is slightly larger than the radial dimension of the rotating shaft 121, so that the perfusion liquid in the third circulation chamber 19 can flow into the outflow channel 40 through the gap between the first through hole 151 on the distal cover 15 and the rotating shaft 121, and can also flow into the second circulation chamber 1111 through the gap between the balls on the distal bearing 13. By setting the radial dimension of the first through hole 151, most of the perfusion liquid can be controlled to flow to the distal bearing 13, and a small part of the perfusion liquid is used to balance the pressure difference between the outflow channel 40 and the third circulation chamber 19, thereby reducing the total amount of blood flowing into the motor 10 at the outflow channel 40 and reducing the probability of blood forming thrombus in the motor 10.

[0076] In some embodiments, the first pipe 20 is a perfusion pipe, and the second pipe 30 is a return pipe. The perfusion liquid in the first pipe 20 flows through the first circulation cavity 1211, the third circulation cavity 19, the distal bearing 13, the second circulation cavity 1111 and the proximal bearing 14 in sequence, and then flows out of the motor 10 through the second pipe 30.

[0077] In the blood pumping device provided in this embodiment, when the perfusion liquid flows through the distal bearing 13 and the proximal bearing 14, it can carry away the particles generated when the bearings rotate, effectively reducing the particles generated when the motor 10 is running and entering the human body, reducing the total amount of perfusion liquid flowing into the patient's body, and then reducing the total amount of particles flowing into the patient's body, thereby improving product safety. By making the first pipe 20 a perfusion pipe and the second pipe 30 a return pipe, the perfusion liquid will first enter the third circulation cavity 19 from the first circulation cavity 1211, and then flow out from the second pipe 30 after flushing the bearings, so that the particle content in the perfusion liquid at the third circulation cavity 19 is extremely low, reducing the total amount of particles flowing into the patient's body from the first through hole 151.

[0078] In some embodiments, the distal opening 1212 is located on the side of the distal bearing 13 away from the proximal bearing 14, and the distal opening 1212 is located at the proximal end of the first through hole 151. It can also be understood that the distal opening 1212 is directly connected to the third circulation cavity 19, and the third circulation cavity 19 is connected to the second circulation cavity 1111 through the distal bearing 13. The perfusion liquid flowing into the third circulation cavity 19 from the distal opening 1212 needs to flow through the distal bearing 13 and the proximal bearing 14 before flowing out through the second pipe 30, which ensures that the distal bearing 13 and the proximal bearing 14 are cooled by the perfusion liquid while reducing the total amount of particles at the distal bearing 13 flowing into the patient's body from the first through hole 151.

[0079] In other embodiments, the distal opening 1212 is located at the proximal end of the distal bearing 13, and the distal opening 1212 is located at the distal end of the proximal bearing 14, that is, the distal opening 1212 is located between the distal bearing 13 and the proximal bearing 14. At this time, the distal opening 1212 is directly connected to the second circulation cavity 1111, the distal end of the second circulation cavity 1111 is connected to the third circulation cavity 19 through the distal bearing 13, and the proximal end of the second circulation cavity 1111 is connected to the second pipe 30 through the proximal bearing 14. After the perfusion liquid flows into the second circulation cavity 1111 from the distal opening 1212, it will flow in the direction of the distal bearing 13 and the proximal bearing 14 respectively. One path of the perfusion liquid flows out from the second pipe 30 after flowing through the proximal bearing 14. The other path of the perfusion liquid flows into the patient's blood vessel after flowing through the distal bearing 13, passing through the third circulation cavity 19 and the first through hole 151.

[0080] In some of the embodiments, the proximal cover 16 is also embedded in the first mounting hole 171 , and the proximal cover 16 is located on a side of the proximal bearing 14 facing away from the distal bearing 13 .

[0081] like Fig. 9 As shown, in some embodiments, the circumferential surface of the proximal bearing seat 17 facing the first mounting hole 171 includes a first step surface 172, a second step surface 173 and a third step surface 174 arranged in sequence, and the first step surface 172 is located at the distal end of the proximal bearing seat 17. The radial dimension of the first step surface 172 is smaller than the radial dimension of the second step surface 173, and the radial dimension of the second step surface 173 is smaller than the radial dimension of the third step surface 174. The proximal bearing 14 is embedded in the first step surface 172, and the proximal cover 16 is embedded in the third step surface 174.

[0082] Among them, the multiple step surfaces on the circumferential surface of the proximal bearing seat 17 facing the first mounting hole 171 refer to the circumferential surface having multiple through holes with different radial dimensions, the hole surface (inner circumferential surface) of the through hole is defined as the step surface, and the radial dimension refers to the hole diameter of the through hole.

[0083] In some of the embodiments, a sealing gasket 175 is further disposed in the first mounting hole 171 , and the sealing gasket 175 is located between the proximal bearing 14 and the proximal cover 16 .

[0084] In some embodiments, the circumferential surface of the proximal bearing seat 17 facing away from the first mounting hole 171 includes a fourth step surface 176, a fifth step surface 177 and a sixth step surface 178 arranged in sequence, and the fourth step surface 176 is located at the distal end of the proximal bearing seat 17. The radial dimension of the fourth step surface 176 is smaller than the radial dimension of the fifth step surface 177, and the radial dimension of the fifth step surface 177 is smaller than the radial dimension of the sixth step surface 178. The circumferential surface of the winding 112 facing the magnetic steel 122 overlaps the fourth step surface 176, the circumferential surface of the core 113 facing the winding 112 overlaps the fifth step surface 177, and the interventional catheter 50 is directly or indirectly overlapped on the sixth step surface 178.

[0085] Among them, the multiple step surfaces on the circumferential surface of the proximal bearing seat 17 away from the first mounting hole 171 refer to multiple bosses with different radial sizes on the circumferential surface, the outer circumferential surface of the boss is defined as the step surface, and the radial size refers to the diameter of the boss.

[0086] In some of the embodiments, the motor 10 further includes a housing (not shown), which is sleeved outside the iron core 113 , and at least a portion of the housing is in contact with the outer circumference of the iron core 113 .

[0087] It is understood that the parts of the above-mentioned blood pumping device that come into contact with the human body and blood must all be made of biosafety materials, which can be metal or non-metal. For example, when these parts are metal, they can be made of 316 stainless steel.

[0088] In other embodiments, the iron core 113 may also serve as the outer shell of the motor 10 to directly contact the patient's tissue, so that the motor 10 does not need to be provided with an additional shell, thereby reducing the diameter of the motor 10 and the difficulty of intervention.

[0089] It can be understood that the various components of the aforementioned embodiments are introduced separately, and in fact, the various components can be recombined and formed into one piece. For example, the iron core 113 and the proximal bearing seat 17 are formed into one piece, and for another example, the iron core 113 and the distal bearing seat 18 are formed into one piece, and for another example, the iron core 113 and the distal cover 15 are formed into one piece. The above are only some examples of integrated molding, not all integrated molding solutions. As long as the combination solutions that can meet the processing requirements and performance requirements are within the protection scope of this application.

[0090] In some optional embodiments, the present application further provides a pumping device for conveying other body fluids besides blood, the pumping device comprising a motor 10, a first pipe 20 and a second pipe 30, the motor 10 comprising a stator assembly 11 and a rotor assembly 12, the stator assembly 11 being provided with a receiving chamber 111, at least part of the rotor assembly 12 being located in the receiving chamber 111, the rotor assembly 12 comprising a rotating shaft 121 capable of rotating relative to the stator assembly 11, the rotating shaft 121 being provided with a first circulation chamber 1211 communicating with the receiving chamber 111, the receiving chamber 111 being provided with a second circulation chamber 1111 communicating with the first circulation chamber 1211. The first pipe 20 is in communication with the first circulation chamber 1211, the second pipe 30 is in communication with the second circulation chamber 1111, one of the first pipe 20 and the second pipe 30 is a perfusion pipe, and the other is a return pipe, the perfusion pipe is used to convey perfusion liquid to the motor 10, and the return pipe is used to discharge the perfusion liquid in the motor 10.

[0091] In some embodiments, the body fluid includes tissue fluid, digestive fluid, etc.

[0092] The structure of the liquid pumping device refers to that of the blood pumping device and can produce the same technical effects as the blood pumping device, so it will not be elaborated on here.

[0093] In addition, the present application also provides a motor, which includes a stator assembly and a rotor assembly, wherein a receiving chamber is provided in the stator assembly, at least part of the rotor assembly is located in the receiving chamber, and the rotor assembly includes a rotating shaft that can rotate relative to the stator assembly, wherein a first circulation chamber communicating with the receiving chamber is provided in the rotating shaft, and a second circulation chamber communicating with the first circulation chamber is provided in the receiving chamber. One of the first circulation chamber and the second circulation chamber is used to communicate with an infusion pipe, and the other is used to communicate with a return pipe, wherein the infusion pipe is used to transport the infusion liquid into the motor, and the return pipe is used to discharge the infusion liquid in the motor.

[0094] It can be understood that the motor provided in the present application can be the motor of any one of the aforementioned blood pumping devices and liquid pumping devices, and will not be described repeatedly here.

[0095] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A blood pumping device for conveying blood, characterized in that: include: A motor, comprising a stator assembly and a rotor assembly, wherein a receiving cavity is provided in the stator assembly, at least a portion of the rotor assembly is located in the receiving cavity, the rotor assembly comprises a rotating shaft rotatable relative to the stator assembly, a first flow cavity is provided in the rotating shaft, and a second flow cavity communicating with the first flow cavity is provided in the receiving cavity; a first pipe, communicating with the first flow chamber; The second pipe is connected to the second circulation cavity, one of the first pipe and the second pipe is a perfusion pipe, and the other is a return pipe. The perfusion pipe is used to transport perfusion liquid into the motor, and the return pipe is used to discharge the perfusion liquid in the motor.

2. The blood pumping device according to claim 1, characterized in that: The first circulation cavity includes a distal opening and a proximal opening, wherein the distal opening is located on the circumferential surface of the rotating shaft, and the proximal opening is located on the proximal end surface of the rotating shaft, the proximal opening is communicated with the second pipe, and the distal opening is communicated with the second circulation cavity.

3. The blood pumping device according to claim 2, characterized in that: The motor also includes: A distal bearing, sleeved on the rotating shaft; The proximal bearing is sleeved on the rotating shaft, and the rotating shaft is rotatably connected to the stator assembly through the distal bearing and the proximal bearing. The distal bearing is located on the side of the proximal bearing away from the first pipe, and the distal opening is located on the side of the distal bearing away from the proximal bearing.

4. The blood pumping device according to claim 2 or 3, characterized in that: The motor also includes: A distal cover connected to the distal end of the stator assembly, the distal cover is provided with a first through hole penetrating the distal cover along the axial direction of the rotating shaft, at least a portion of the rotating shaft extends out of the accommodating cavity from the first through hole, and the distal cover is used to seal the distal end of the accommodating cavity; A proximal cover is connected to the proximal end of the stator assembly, and is used to seal the proximal end of the accommodating cavity. A second through hole and a third through hole are provided on the proximal cover, and the second through hole is used to connect the first circulation cavity with the first pipeline, and the third through hole is used to connect the second circulation cavity with the second pipeline.

5. The blood pumping device according to claim 4, characterized in that: The second through hole and the third through hole penetrate the proximal cover along the axial direction of the rotating shaft, and at least a portion of the first pipeline extends from the second through hole into the accommodating cavity and communicates with the proximal opening.

6. The blood pumping device according to claim 5, characterized in that: The motor also includes: A proximal bearing seat, the proximal bearing seat is connected to the proximal end of the stator assembly, the proximal bearing seat is provided with a first mounting hole penetrating the proximal bearing seat along the axial direction of the rotating shaft, and the proximal bearing is embedded in the first mounting hole; A distal bearing seat is connected to the distal end of the stator assembly, and a second mounting hole is provided on the distal bearing seat and passes through the distal bearing seat along the axial direction of the rotating shaft, and the distal bearing is embedded in the second mounting hole.

7. The blood pumping device according to claim 6, characterized in that: The proximal cover is embedded in the first mounting hole, and the proximal cover is located at a side of the proximal bearing facing away from the distal bearing.

8. The blood pumping device according to claim 7, characterized in that: A sealing gasket is also provided in the first mounting hole, and the sealing gasket is located between the proximal cover and the proximal bearing.

9. The blood pumping device according to claim 1, characterized in that: The rotor assembly further comprises a magnetic steel located in the accommodating cavity, the magnetic steel is sleeved on the rotating shaft and rotates synchronously with the rotating shaft; the stator assembly comprises a winding and an iron core, the winding is sleeved outside the magnetic steel, the iron core is sleeved outside the winding, and the gap between the winding and the rotor assembly forms the second flow cavity; And / or, the first pipeline is a perfusion pipeline, and the second pipeline is a return pipeline.

10. A motor, characterized in that: The motor comprises a stator assembly and a rotor assembly, wherein a receiving cavity is provided in the stator assembly, and at least a part of the rotor assembly is located in the receiving cavity. The rotor assembly comprises a rotating shaft which can rotate relative to the stator assembly, wherein a first circulation cavity is provided in the rotating shaft, and a second circulation cavity which is connected with the first circulation cavity is provided in the receiving cavity. One of the first circulation cavity and the second circulation cavity is used to communicate with an injection pipe, and the other is used to communicate with a return pipe. The injection pipe is used to transport the injection liquid into the motor, and the return pipe is used to discharge the injection liquid in the motor.

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