A blood pump assembly

Abstract

The present invention relates to a blood pump assembly, comprising a pump housing, a stator, a rotating shaft, a first bearing, a second bearing, an impeller, and a proximal connector. The pump housing is tubular, the stator is fixed within the pump housing, the rotating shaft is located radially inward of the stator, and a first liquid tank is provided on the pump housing. The proximal connector cooperates with the first bearing and is provided with a receiving chamber that covers the proximal end of the rotating shaft. The proximal connector is provided with an insertion port for receiving an infusion tube, the insertion port being connected to the receiving chamber. The proximal connector is also provided with a first drainage hole, one end of the first drainage hole being connected to the receiving chamber, and the other end of the first drainage hole being connected to the proximal end of the first liquid tank. The pump housing is made of a non-ceramic material, and the first liquid tank is formed on the pump housing so that flushing fluid can flow through the first liquid tank, thereby removing heat from the pump housing.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a blood pump assembly. Background Art

[0002] Patients with reduced left ventricular function may need to use a left ventricular assist device for a short period of time. One end of the cannula in the ventricular assist device is inserted into the left ventricle through the aorta, and the other end is located in the aorta. The blood pump assembly in the ventricular assist device works to pump the blood in the left ventricle into the aorta through the cannula, thereby achieving the surgical purpose. Current blood pumps mostly use axial flow pumps, which drive the impeller to rotate through the rotating shaft. There is a gap between the rotating shaft and the end cover at the distal end of the blood pump to ensure that the rotating shaft can rotate freely. The existence of this gap allows the patient's blood to enter the pump casing, causing thrombosis inside the blood pump. In order to prevent this situation, a flushing fluid is input into the proximal side of the blood pump, so that the flushing fluid passes between the rotating shaft and the stator and is sprayed toward the distal end from the gap, thereby achieving liquid sealing and preventing blood from entering the blood pump; when the flushing fluid is sprayed out, it will also bring out the heat generated by the operation of the blood pump.

[0003] When the blood pump is running, both the rotating shaft and the stator will generate heat. In order to reduce the impact of the heat of the blood pump on the operation, it is necessary to isolate the heat of the blood pump or to dissipate the heat from the blood pump. The existing technology achieves this in two aspects. On the one hand, the heat inside the axial flow pump is taken away by the aforementioned flushing fluid, and at the same time, the pump casing is made of ceramic material to improve the thermal insulation performance of the pump casing; however, since the radial dimension of the blood pump is very small, it is relatively difficult to manufacture such a small-sized ceramic pump casing, which increases the production cost of the entire blood pump, thereby pushing up the cost of the ventricular assist device, which is not conducive to the performance of heart surgery. Summary of the Invention

[0004] In view of this, the present invention provides a blood pump assembly, forming a first liquid groove on the pump housing, so that the flushing liquid can flow through the first liquid groove, thereby taking away the heat on the pump housing, reducing the manufacturing cost of the blood pump assembly, and avoiding overheating of the blood pump assembly.

[0005] The technical solution adopted in the present invention is:

[0006] A blood pump assembly includes a pump housing, a stator, a rotating shaft, a first bearing, a second bearing, an impeller, and a proximal connector. The pump housing is tubular, the stator is fixed within the pump housing, the rotating shaft is located radially inward of the stator, the proximal end of the rotating shaft is sleeved with the first bearing, and the distal end of the rotating shaft is sleeved with the second bearing, so that the rotating shaft is rotatably connected to the pump housing via the first bearing and the second bearing. The distal end of the rotating shaft is also connected to the impeller.

[0007] The pump housing is provided with a first liquid tank, and the radial opening of the first liquid tank is sealed;

[0008] The proximal connecting member cooperates with the first bearing, and a accommodating cavity is provided in the proximal connecting member, and the accommodating cavity covers the proximal end of the rotating shaft. The proximal connecting member is provided with an insertion interface, and the insertion interface is used to plug the infusion tube, and the insertion interface is connected to the accommodating cavity. The proximal connecting member is also provided with a first drainage hole, one end of the first drainage hole is connected to the accommodating cavity, and the other end of the first drainage hole is connected to the proximal end of the first liquid tank.

[0009] Preferably, a stopper is further included, which is sleeved on the outside of the proximal connecting member, and the distal end of the stopper abuts against the proximal end of the stator. The stopper is provided with a second drainage hole, and the second drainage hole is connected to the first drainage hole, and the first drainage hole is connected to the proximal end of the first liquid tank through the second drainage hole.

[0010] Preferably, a sealing member is further included, which is sleeved on the outside of the stop member, the distal end of the sealing member abuts the proximal end of the pump housing, and a relay channel is provided in the sealing member, one end of the relay channel is connected to the proximal end of the first liquid tank, and the other end of the relay channel is connected to the second drainage hole.

[0011] Preferably, the relay channel includes a third drainage hole and a second liquid trough, the third drainage hole passes through the side wall of the seal, the second liquid trough is arranged on the outer wall of the seal, the inner end of the third drainage hole is connected to the second drainage hole, the outer end of the third drainage hole is connected to the proximal end of the second liquid trough, and the distal end of the second liquid trough is connected to the proximal end of the first liquid trough.

[0012] Preferably, an annular connecting groove is further provided on the outer wall of the sealing member, the outer end of the second liquid drain hole is communicated with the connecting groove, and the proximal end of the second liquid groove is communicated with the connecting groove;

[0013] It also includes an outer sheath and a proximal sheath. The first liquid groove is located on the outer wall of the pump housing. The outer sheath is sleeved on the outside of the pump housing. The proximal sheath is simultaneously sleeved on the outside of the proximal end of the outer sheath and the outside of the entire sealing element. The proximal sheath closes the radial openings of the connecting groove and the second liquid groove from the outside.

[0014] Preferably, a third liquid groove corresponding to the first liquid groove is provided on the inner wall of the outer sheath, and the direction of the third liquid groove is consistent with the direction of the first liquid groove. In the radial direction of the pump housing, the first liquid groove and the third liquid groove are interlocked with each other.

[0015] Preferably, the number of the first liquid groove is one, and the first liquid groove extends spirally on the pump housing.

[0016] Preferably, in the circumferential direction of the pump casing, the pump casing is divided into multiple cooling areas, the number of the first liquid tanks is consistent with the number of the cooling areas, and the multiple first liquid tanks correspond one-to-one to the multiple cooling areas. In the cooling areas, along the axial direction of the pump casing, the first liquid tanks extend in a wave shape.

[0017] Preferably, the number of the second liquid grooves is consistent with the number of the first liquid grooves and corresponds one to one, and the distal ends of the second liquid grooves are connected to the proximal ends of the corresponding first liquid grooves.

[0018] Preferably, it also includes a connecting tube, which is sleeved on the outside of the outer sheath, the proximal end of the connecting tube abuts against the distal end of the proximal sheath, and a blood outlet is provided on the connecting tube. In the axial direction of the rotating shaft, the blood outlet and the impeller are located at the same position.

[0019] Beneficial effects of the present invention:

[0020] The blood pump assembly of the present invention is applied to a ventricular assist device. When the blood pump is working, the rotating shaft rotates relative to the stator, thereby causing the impeller to rotate to pump the blood in the left ventricle into the aorta. During the rotation of the rotating shaft, both the rotating shaft and the stator generate heat. A flushing liquid is input into the accommodating cavity in the proximal connecting piece through the infusion tube. The flushing liquid enters between the rotating shaft and the stator through the first bearing, thereby absorbing the heat of the rotating shaft and the stator, and finally sprayed out from the gap in the end cover; in addition, the heat on the stator will also be transferred to the pump casing, causing the temperature of the pump casing to increase. The flushing liquid in the accommodating cavity flows into the first liquid tank through the first drainage hole. Since the first liquid tank is set on the outer wall of the pump casing, the flushing liquid will take away the heat on the pump casing when flowing on the first liquid tank, thereby preventing the temperature of the pump casing from being too high. The flushing liquid flowing through the first liquid tank is finally sprayed out from the distal end of the first liquid tank and enters the patient's body.

[0021] In the present invention, the pump casing can be made of non-ceramic materials, making the pump casing easier to manufacture, thereby reducing the manufacturing cost of the entire blood pump assembly. At the same time, by providing a first liquid tank on the outer wall of the pump casing, the flushing liquid can flow through the outer wall of the pump casing to take away the heat on the pump casing, so that the temperature of the pump casing is maintained within the set temperature, avoiding the pump casing temperature being too high and affecting the progress of the operation, thereby improving the safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0023] Figure 1is a schematic diagram of the structure of a blood pump assembly;

[0024] Figure 2 is a cross-sectional view of a blood pump assembly;

[0025] Figure 3 yes Figure 2 Enlarged view of part A;

[0026] Figure 4 is an exploded view of the blood pump assembly;

[0027] Figure 5 is a cross-sectional view of the proximal connector, the stopper, and the seal after assembly;

[0028] Figure 6 is a schematic diagram of the first liquid tank and the second liquid tank;

[0029] Figure 7 It is a cross-sectional view of the pump casing and outer jacket;

[0030] Figure 8 It is a structural diagram of the stopper;

[0031] Figure 9 It is a schematic diagram of the structure of a ventricular assist device;

[0032] Figure 10 yes Figure 9 A partial cross-sectional view of

[0033] Figure 11 It is a structural schematic diagram of another embodiment of the pump casing.

[0034] In the figure: 1, connecting pipe; 2, proximal sheath; 3, pump housing; 4, proximal connector; 5, stopper; 6, seal; 7, outer sheath; 8, impeller; 9, rotating shaft; 10, first bearing; 20, second bearing; 30, bushing; 40, stator; 50, guide tube; 60, liquid inlet pipe; 70, cannula;

[0035] 11. Blood outlet; 12. End cap;

[0036] 31. First liquid tank;

[0037] 41. First constant diameter section; 42. Variable diameter section; 43. Second constant diameter section; 44. Insertion port; 45. Accommodation cavity; 46. First drainage hole;

[0038] 51. Second drainage hole; 52. Insert leg; 53. Main body;

[0039] 61. Third liquid drain hole; 62. Second liquid tank; 63. Connecting tank;

[0040] 71. The third liquid tank. DETAILED DESCRIPTION

[0041] The present invention is described below based on the following embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid obscuring the essence of the present invention, well-known methods, processes, procedures, and components are not described in detail.

[0042] Furthermore, persons of ordinary skill in the art will appreciate that the figures provided herein are for illustration purposes only and are not necessarily drawn to scale.

[0043] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include," "comprising," and similar words should be construed in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to."

[0044] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0045] In the present invention, “distal” refers to the side closer to the patient's body during surgery; and “proximal” refers to the side closer to the operator during surgery.

[0046] See also Figures 1-11 The present invention provides a blood pump assembly (hereinafter referred to as the "blood pump" for ease of description) for use in a ventricular assist device. It serves as a power source in a ventricular assist device, which is primarily used for short-term temporary use by patients with reduced left ventricular function, such as in PCI (percutaneous coronary intervention) procedures and cardiogenic shock surgeries, to pump blood from the left ventricle to the aorta. The blood pump assembly includes a pump housing 3, a stator 40, a rotating shaft 9, a first bearing 10, a second bearing 20, an impeller 8, an outer sheath 7, and a proximal connector 4. The pump housing 3 is tubular, the stator 40 is fixed within the pump housing 3, and the rotating shaft 9 is located radially inward of the stator 40. The first bearing 10 is sleeved on the proximal end of the rotating shaft 9, and the second bearing 20 is sleeved on the distal end of the rotating shaft 9. The rotating shaft 9 is rotatably connected to the pump housing 3 via the first and second bearings 10, 20. The impeller 8 is also connected to the distal end of the rotating shaft 9.

[0047] A first liquid groove 31 is provided on the outer wall of the pump housing 3 (of course, the first liquid groove 31 can also be located on the inner wall of the pump housing 3). The first liquid groove 31 runs through the distal end and the proximal end of the pump housing 3. The outer sheath 7 is sleeved on the outer side of the pump housing 3 and closes the radial opening of the first liquid groove 31.

[0048] The proximal connecting member 4 cooperates with the first bearing 10, and a accommodating cavity 45 is provided in the proximal connecting member 4, and the accommodating cavity 45 covers the proximal end of the rotating shaft 9. The proximal connecting member 4 is provided with an insertion port 44, and the insertion port 44 is used to plug the infusion tube, and the insertion port 44 is connected to the accommodating cavity 45. The proximal connecting member 4 is also provided with a first drainage hole 46, one end of the first drainage hole 46 is connected to the accommodating cavity 45, and the other end of the first drainage hole 46 is connected to the proximal end of the first liquid tank 31.

[0049] In the embodiment where the first liquid tank 31 is located on the inner wall of the pump housing 3 , an outer sheath is provided between the pump housing 3 and the stator 40 to close the radial opening inside the first liquid tank 31 .

[0050] In order to fully understand the purpose of the present invention, taking the ventricular assist device during surgery as an example, the distal end of the blood pump is connected to a cannula 70, and the proximal end of the blood pump is connected to a catheter 50. A liquid inlet tube 60 is provided in the catheter 50, and the liquid inlet tube 60 is plugged into the plug port 44; during surgery, the distal end of the cannula 70 extends into the left ventricle, and a blood outlet 11 is provided at the blood pump. The blood pump is located in the aorta. When the blood pump works, it pumps the blood in the left ventricle into the aorta, and at the same time, a flushing liquid (a mixture of glucose and heparin) is input into the accommodating chamber 45 through the liquid inlet tube 60. The flushing liquid first fills the accommodating chamber 45, and then the flushing liquid is divided into two paths. The first path flows through the gap between the first bearing 10 and the rotating shaft 9 to the gap between the rotating shaft 9 and the stator 40, so this part Part of the flushing liquid can take away the heat of the rotating shaft 9 and the stator 40, and then this part of the flushing liquid continues to flow toward the distal side, passes through the gap between the second bearing 20 and the rotating shaft 9, and is finally ejected from the gap between the rotating shaft 9 and the end cover 12 (hereinafter referred to as the "first gap"). Since the flushing liquid is ejected toward the distal side in the first gap, blood will not enter between the rotating shaft 9 and the stator 40 from the first gap; the second path flows out through the first drainage hole 46 to the first liquid tank 31. Since the first liquid tank 31 is arranged on the outer wall of the pump housing 3, the flushing liquid will take away the heat on the pump housing 3 when flowing on the first liquid tank 31, thereby avoiding the temperature of the pump housing 3 from being too high. The flushing liquid flowing through the first liquid tank 31 is finally ejected from the distal end of the first liquid tank 31 and enters the patient's body.

[0051] In the present invention, the pump casing 3 is made of non-ceramic material (for example, stainless steel or copper). On the one hand, it makes the pump casing 3 easier to manufacture, thereby reducing the manufacturing cost of the entire blood pump assembly. In addition, due to the change of the material of the pump casing 3, the thermal insulation performance of the pump casing 3 is reduced (compared with the pump casing 3 made of ceramic material). In other words, the heat on the stator 40 can be conducted outward to the pump casing 3, so that the temperature of the pump casing 3 increases. The present invention provides a first liquid tank 31 on the outer wall of the pump casing 3 so that the flushing liquid can flow through the outer wall of the pump casing 3 to take away the heat on the pump casing 3, so that the temperature of the pump casing 3 is maintained within the set temperature, thereby avoiding the pump casing 3 from being too high and affecting the progress of the operation, thereby improving the safety of the operation.

[0052] The distal end of the rotating shaft 9 is provided with a second bearing 20, and the proximal end of the rotating shaft 9 is provided with a first bearing 10. Both the first bearing 10 and the second bearing 20 cooperate with the inner wall of the pump housing 3 (directly or indirectly), so that the rotating shaft 9 can rotate relative to the pump housing 3. Figure 2 In the embodiment shown, the proximal end of the rotating shaft 9 can also be provided with a sleeve 30, which is located on the proximal side of the first bearing 10. The first rotating shaft 9 is positioned in the axial direction by the sleeve 30 to prevent the first bearing 10 from moving toward the proximal side. From far to near, the proximal connecting member 4 can include a first equal diameter section 41, a reducing section 42 and a second equal diameter section 43. The proximal connecting member 4 is a structure of equal wall thickness (the wall thickness at each location is basically the same). The diameter of the first equal diameter section 41 is larger than the diameter of the second equal diameter section 43. From far to near, the diameter of the reducing section 42 gradually becomes smaller, so that the reducing section 4 2 can be connected to the first equal diameter section 41, and the small end of the reducing section 42 can be connected to the second equal diameter section 43. The first equal diameter section 41 can be sleeved on the outside of the first bearing 10 and the sleeve 30. The second equal diameter section 43 forms an insertion port 44, and the reducing section 42 forms a accommodating cavity 45. The first drainage hole 46 is located in the reducing section 42. In this way, the proximal connector 4 can cover the proximal end of the rotating shaft 9. The infusion tube is plugged into the insertion port 44 and can be sealed with glue. When the infusion tube injects flushing liquid into the accommodating cavity 45, it is ensured that the flushing liquid will not leak from the insertion port 44.

[0053] An end cover 12 may also be sleeved on the outer side of the rotating shaft 9. The end cover 12 is located on the distal side of the second bearing 20. The end cover 12 is connected to the distal end of the pump housing 3 and basically closes the distal end of the pump housing 3, so that a smaller (small radial dimension) gap (the aforementioned first gap) is formed between the rotating shaft 9 and the end cover 12, reducing the possibility of blood entering the space between the rotating shaft 9 and the stator 40 from the first gap. At the same time, it also makes it easier to form high pressure (formed by the accumulation of flushing fluid) on the proximal side of the end cover 12, thereby preventing blood from entering the space between the stator 40 and the rotating shaft 9.

[0054] The blood pump may further include a stopper 5, which is sleeved on the outside of the proximal connecting member 4, and the distal end of the stopper 5 abuts against the proximal end of the stator 40. The stopper 5 is provided with a second drainage hole 51, and the second drainage hole 51 is connected to the first drainage hole 46. The first drainage hole 46 is connected to the proximal end of the first liquid tank 31 through the second drainage hole 51.

[0055] like Figure 8 In the illustrated embodiment, the stopper 5 includes three legs 52 and a main body 53. The three legs 52 are connected to the distal end of the main body 53. The main body 53 forms a matching cavity with an opening facing the distal side. The three legs 52 are evenly spaced in the circumferential direction. During assembly, the legs 52 are inserted between the first equal-diameter section 41 and the pump housing 3, so that the first equal-diameter section 41 is compressed and limited in the radial direction, ensuring that the flushing liquid in the accommodating chamber 45 can only flow along the two preset paths. The inner wall of the matching cavity fits the outer wall of the variable-diameter section 42, thereby supporting the variable-diameter section 42 from the outside. The proximal connector 4 can be made of a deformable material such as silicone, so that the first equal-diameter section 41 can be compressed in the radial direction to improve the sealing performance. The stopper 5 is made of a hard material (such as plastic), so that the stopper 5 cannot be compressed and can support the variable-diameter section 42 from the outside to prevent the variable-diameter section 42 from deforming outward.

[0056] The distal end of the stopper 5 abuts against the proximal end of the stator 40 , so that the stopper 5 can be positioned by the stator 40 .

[0057] A second drainage hole 51 is provided on the stopper 5, and the second drainage hole 51 is located on the main body 53. The radial inner end of the second drainage hole 51 is connected to the radial outer end of the first drainage hole 46, so that the flushing liquid can enter the second drainage hole 51 through the first drainage hole 46, thereby guiding the flushing liquid to reach the first liquid tank 31.

[0058] The blood pump also includes a seal 6, which is sleeved on the outside of the stopper 5, and the distal end of the seal 6 abuts the proximal end of the pump housing 3. A relay channel is provided in the seal 6, one end of the relay channel is connected to the proximal end of the first liquid tank 31, and the other end of the relay channel is connected to the second drainage hole 51.

[0059] The seal 6 can be obtained by injection molding, thereby closing the stopper 5 from the outside to prevent leakage of the flushing liquid. The outer diameter of the seal 6 is consistent with the outer diameter of the pump housing 3, so that the seal 6 can completely seal the proximal end of the pump housing 3, so that the relay channel can be directly connected to the proximal end of the first liquid tank 31, so that the flushing liquid passes through the first drainage hole 46, the second drainage hole 51 and the relay channel in sequence into the first liquid tank 31.

[0060] Furthermore, the relay channel includes a third drainage hole 61 and a second liquid groove 62. The third drainage hole 61 passes through the side wall of the sealing member 6, and the second liquid groove 62 is provided on the outer wall of the sealing member 6. The inner end of the third drainage hole 61 communicates with the second drainage hole 51, and the outer end of the third drainage hole 61 is connected to the proximal end of the second liquid groove 62. The distal end of the second liquid groove 62 is connected to the proximal end of the first liquid groove 31. The flushing liquid enters the first liquid groove 31 in sequence through the first drainage hole 46, the second drainage hole 51, the third drainage hole 61, and the second liquid groove 62.

[0061] Preferably, the first drainage hole 46, the second drainage hole 51 and the third drainage hole 61 are all extended and connected radially, so that the flushing liquid can flow to the second liquid tank 62 in the shortest path, thereby facilitating the flushing liquid to enter the first liquid tank 31 more efficiently and improving the cooling ability of the pump casing 3.

[0062] In addition, the first drainage hole 46 , the second drainage hole 51 and the third drainage hole 61 all extend in the radial direction, which also facilitates the processing and formation of these three holes.

[0063] An annular connecting groove 63 is further provided on the outer wall of the sealing member 6 . The outer end of the second liquid drain hole 51 is in communication with the connecting groove 63 , and the proximal end of the second liquid groove 62 is in communication with the connecting groove 63 .

[0064] It also includes a proximal sheath 2, which is simultaneously sleeved on the outside of the proximal end of the outer sheath 7 and the outside of the entire sealing member 6. The proximal sheath 2 closes the radial openings of the connecting groove 63 and the second liquid groove 62 from the outside.

[0065] The arrangement of the connecting groove 63 means that the second liquid groove 62 does not need to be directly connected to the second liquid drain hole 51 , but only needs the proximal end of the second liquid groove 62 to be connected to any point of the connecting groove 63 .

[0066] The proximal sheath 2 wraps the sealing member 6 from the outside to close the openings of the connecting groove 63 and the second liquid groove 62 to prevent the flushing liquid from leaking.

[0067] A third liquid groove 71 is provided on the inner wall of the outer sheath 7, corresponding to the first liquid groove 31. The third liquid groove 71 is oriented in the same direction as the first liquid groove 31. In the radial direction of the pump housing 3, the first liquid groove 31 and the third liquid groove 71 interlock with each other. The first liquid groove 31 and the third liquid groove 71 are connected in the radial direction, thereby increasing the cross-section of the flushing liquid flowing through the pump housing 3, facilitating the flow of the flushing liquid and ensuring that the pump housing 3 can be cooled.

[0068] Of course, in other embodiments, the outer wall of the pump housing 3 may not have the first liquid tank 31. Instead, a third liquid tank 71 is provided on the inner wall of the outer sheath 7. The distal end of the second liquid tank 62 is connected to the proximal end of the third liquid tank 71, which can also cool the pump housing.

[0069] There is one first liquid groove 31, which spirally extends along the outer wall of the pump housing 3. The first liquid groove 31 winds around the circumference of the pump housing 3 and extends in the axial direction of the pump housing 3. This increases the length of the first liquid groove 31 (in terms of path) and the contact area between the outer wall of the pump housing 3 and the flushing liquid, allowing the flushing liquid to fully cool the pump housing 3.

[0070] See also Figure 11 In another optional embodiment, the pump casing 3 is divided into multiple cooling areas in the circumferential direction of the pump casing 3, the number of the first liquid grooves 31 is consistent with the number of the cooling areas, and the multiple first liquid grooves correspond one-to-one to the multiple cooling areas. In the cooling area, along the axial direction of the pump casing 3, the first liquid grooves 31 extend in a wave shape.

[0071] The cross-section of each cooling area is fan-shaped, and the length of the cooling area is consistent with the length of the pump casing 3. For example, there are three cooling areas, and the arc of each cooling area is approximately 120°. The three first liquid grooves 31 are independent of each other, that is, the three first liquid grooves 31 are not directly connected to each other, so the flow rate of the flushing liquid on the pump casing 3 can be increased, thereby better cooling the pump casing 3. Moreover, the first liquid grooves 31 extend along a wave shape, increasing the path length of each first liquid groove 31, thereby improving the cooling effect on the pump casing 3.

[0072] It is worth noting that since there are multiple first liquid tanks 31, each first liquid tank 31 has a corresponding distal end of the first liquid tank 31, and the flushing liquid is sprayed from the distal end of each first liquid tank 31. The distal ends of the multiple first liquid tanks 31 are evenly arranged in the circumferential direction, and the distal end of each first liquid tank 31 is toward the edge position of the root of the impeller 8, so that the flushing liquid sprayed by each first liquid tank 31 can flush the edge position of the root of the impeller 8. During the operation of the blood pump, the root edge of the impeller 8 may coagulate blood, thereby affecting the blood pumping ability of the blood pump. The flushing liquid sprayed from the first liquid tank 31 can be just facing the edge of the root of the impeller 8, and the flushing liquid contains heparin, which has anti-coagulation ability, and thus can prevent coagulation on the impeller 8, ensure the working ability of the blood pump, and improve the service life of the ventricular assist device.

[0073] The number of the second liquid grooves 62 matches the number of the first liquid grooves 31 and corresponds one to one. The distal ends of the second liquid grooves 62 are connected to the proximal ends of the corresponding first liquid grooves 31. The proximal ends of the multiple first liquid grooves 31 are staggered in the circumferential direction, so that multiple corresponding second liquid grooves 62 are provided to ensure that flushing liquid can be provided to each first liquid groove 31.

[0074] Moreover, the proximal ends of the second liquid grooves 62 are all connected to the connecting grooves 63, so that only one drainage hole group (the first drainage hole 46, the second drainage hole 51 and the third drainage hole 61 connected in the radial direction) is needed to supply liquid to all the first liquid grooves 31.

[0075] Of course, there may be multiple drainage hole groups to increase the liquid supply to the multiple first liquid tanks 31. For example, the number of drainage hole groups is equal to the number of first liquid tanks 31, and the drainage hole groups are evenly arranged at equal angles in the circumferential direction.

[0076] When the number of drainage hole groups is equal to the number of second liquid tanks 62 , the connecting groove 63 can be eliminated, and the corresponding drainage hole groups are independently connected to the corresponding second liquid tanks 62 , so that each drainage hole group supplies liquid to a specific first liquid tank 31 .

[0077] The blood pump also includes a connecting tube 1, which is sleeved on the outside of the outer sheath 7. The proximal end of the connecting tube 1 abuts against the distal end of the proximal sheath 2. The connecting tube 1 is provided with a blood outlet 11. In the axial direction of the rotating shaft 9, the blood outlet 11 and the impeller 8 are located at the same position.

[0078] In the ventricular assist device, the distal end of the connecting tube 1 is connected to the cannula 70, and the distal end of the catheter 50 can wrap the blood pump from the outside (exposing the blood outlet 11), so that the catheter 50 and the blood pump can be effectively connected and the biocompatibility of the ventricular assist device can be improved.

[0079] It should be understood that the above-mentioned embodiments are merely illustrative and non-restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will be included in the scope of the claims of the present invention.

Claims

1. A blood pump assembly, characterized in that: The pump comprises a pump casing, a stator, a rotating shaft, a first bearing, a second bearing, an impeller, and a proximal connecting member, wherein the pump casing is tubular, the stator is fixed in the pump casing, the rotating shaft is located radially inward of the stator, the proximal end of the rotating shaft is sleeved with the first bearing, and the distal end of the rotating shaft is sleeved with the second bearing, so that the rotating shaft is rotatably connected to the pump casing through the first bearing and the second bearing, and the distal end of the rotating shaft is also connected to the impeller; The pump housing is provided with a first liquid tank, and the radial opening of the first liquid tank is sealed; The proximal connecting member cooperates with the first bearing, and a receiving cavity is provided in the proximal connecting member, and the receiving cavity covers the proximal end of the rotating shaft. The proximal connecting member is provided with an insertion port, and the insertion port is used to plug in an infusion tube, and the insertion port is connected to the receiving cavity. The proximal connecting member is also provided with a first drainage hole, one end of the first drainage hole is connected to the receiving cavity, and the other end of the first drainage hole is connected to the proximal end of the first liquid tank; The stator further comprises a stopper, the stopper being sleeved on the outer side of the proximal connecting member, the distal end of the stopper being in contact with the proximal end of the stator, the stopper being provided with a second drainage hole, the second drainage hole being in communication with the first drainage hole, and the first drainage hole being in communication with the proximal end of the first liquid tank via the second drainage hole; The pump further comprises a sealing member, the sealing member being sleeved on the outer side of the stopper, the distal end of the sealing member being in contact with the proximal end of the pump housing, the sealing member being provided with a relay channel, one end of the relay channel being in communication with the proximal end of the first liquid tank, and the other end of the relay channel being in communication with the second liquid drain hole; The relay channel includes a third liquid drainage hole and a second liquid groove, the third liquid drainage hole passes through the side wall of the seal, the second liquid groove is arranged on the outer wall of the seal, the inner end of the third liquid drainage hole is connected to the second liquid drainage hole, the outer end of the third liquid drainage hole is connected to the proximal end of the second liquid groove, and the distal end of the second liquid groove is connected to the proximal end of the first liquid groove.

2. The blood pump assembly according to claim 1, wherein An annular connecting groove is further provided on the outer wall of the sealing member, the outer end of the second liquid drain hole is communicated with the connecting groove, and the proximal end of the second liquid groove is communicated with the connecting groove; It also includes an outer sheath and a proximal sheath. The first liquid groove is located on the outer wall of the pump housing. The outer sheath is sleeved on the outside of the pump housing. The proximal sheath is simultaneously sleeved on the outside of the proximal end of the outer sheath and the outside of the entire sealing element. The proximal sheath closes the radial openings of the connecting groove and the second liquid groove from the outside.

3. The blood pump assembly according to claim 2, wherein: A third liquid groove corresponding to the first liquid groove is provided on the inner wall of the outer sheath. The direction of the third liquid groove is consistent with that of the first liquid groove. In the radial direction of the pump housing, the first liquid groove and the third liquid groove are interlocked with each other.

4. The blood pump assembly according to any one of claims 1 to 3, characterized in that: The number of the first liquid groove is one, and the first liquid groove spirally extends on the pump housing.

5. The blood pump assembly according to claim 2, wherein: In the circumferential direction of the pump casing, the pump casing is divided into multiple cooling areas, the number of the first liquid grooves is consistent with the number of the cooling areas, and the multiple first liquid grooves correspond one-to-one to the multiple cooling areas. In the cooling area, along the axial direction of the pump casing, the first liquid grooves extend in a wave shape.

6. The blood pump assembly according to claim 5, wherein: The number of the second liquid grooves is consistent with the number of the first liquid grooves and corresponds one to one, and the distal ends of the second liquid grooves are connected to the proximal ends of the corresponding first liquid grooves.

7. The blood pump assembly according to claim 2, wherein: It also includes a connecting tube, which is sleeved on the outside of the outer sheath, the proximal end of the connecting tube abuts against the distal end of the proximal sheath, and a blood outlet is provided on the connecting tube. In the axial direction of the rotating shaft, the blood outlet and the impeller are located at the same position.

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