Blood pump

Abstract

The present application relates to a kind of blood pumps, the blood pump includes: cannula assembly, with infusion cavity;Impeller, rotatably arranged in the infusion cavity, the impeller is opened with accommodation cavity and communication hole, the communication hole communicates the infusion cavity and the accommodation cavity;Rotating shaft, with the impeller fixed connection and one end with the convex head in the accommodation cavity;And base, connect the cannula assembly, the base includes support shaft, the end surface of the support shaft forms the recessed cavity matched with the convex head, the flow gap is formed between the impeller and the base, and the flow gap is communicated with the accommodation cavity.The above-mentioned blood pump can reduce the probability of thrombosis.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a blood pump. BACKGROUND

[0002] An intravascular blood pump is a blood pumping device which can be inserted into a patient's heart through the patient's blood vessels. The intravascular blood pump is placed in the opening of a heart valve so that blood can flow through the blood pump and into the arterial blood vessels. However, the conventional intravascular blood pump is prone to thrombosis. SUMMARY

[0003] One of the technical problems solved by the present application is how to reduce the probability of thrombosis.

[0004] A blood pump, comprising:

[0005] A cannula assembly having a liquid delivery cavity;

[0006] A impeller rotatably arranged in the liquid delivery cavity, the impeller having a receiving cavity and a communication hole, the communication hole connecting the liquid delivery cavity and the receiving cavity;

[0007] A rotating shaft fixedly connected with the impeller and having a protruding head located in the receiving cavity at one end; and

[0008] A base connected with the cannula assembly, the base comprising a support shaft, an end surface of the support shaft forming a concave cavity matched with the protruding head, a flow-through gap being formed between the impeller and the base, the flow-through gap being communicated with the receiving cavity.

[0009] In one of the embodiments, the protruding head is spherical or spheroid.

[0010] In one of the embodiments, the protruding head has a convex surface abutting against the end surface, at least part of the convex surface being received in the concave cavity.

[0011] In one of the embodiments, the support shaft further has an outer lateral surface and a flow guide surface, the outer lateral surface being located outside the receiving cavity and arranged around the end surface, the support shaft further having a flow guide groove penetrating through the outer lateral surface and the end surface and communicated with the concave cavity, the flow guide surface connecting the outer lateral surface and the end surface and defining part of the boundary of the flow guide groove.

[0012] In one of the embodiments, the distance from the flow guide surface to the central axis of the support shaft gradually increases in the direction away from the rotating shaft.

[0013] In one of the embodiments, the flow guide surface comprises an intermediate flow guide section and two edge flow guide sections arranged along the circumference of the support shaft, the intermediate flow guide section is connected between the two edge flow guide sections, the intermediate flow guide section is convex towards the direction away from the central axis of the support shaft, and the edge flow guide sections are concave towards the direction close to the central axis of the support shaft.

[0014] In one of the embodiments, the length of the intermediate flow guide section along the circumference of the support shaft gradually increases in the direction away from the rotating shaft.

[0015] In one of the embodiments, the number of the flow guide grooves is plural, and the plural flow guide grooves are arranged along the circumference of the support shaft.

[0016] In one of the embodiments, the base has a support surface, the support shaft is connected to the support surface and is convexly arranged relative to the support surface, the impeller further comprises a rotating body and a first blade and a second blade arranged on the rotating body, the receiving cavity is arranged in the rotating body, the flow passage gap is located between the rotating body and the support surface, the first blade is located in the infusion cavity, and the second blade is at least partially located in the flow passage gap.

[0017] In one of the embodiments, the communication hole has two openings, the two openings are respectively communicated with the receiving cavity and the infusion cavity, the opening communicated with the receiving cavity is directed towards the recessed cavity, and the opening communicated with the receiving cavity is farther away from the flow passage gap than the end surface of the support shaft.

[0018] In one of the embodiments, a plurality of inner pieces are arranged in the infusion cavity, the inner pieces are convexly arranged relative to the cavity wall surface of the infusion cavity, and the plurality of inner pieces enclose an installation cavity matched with the rotating shaft.

[0019] In one of the embodiments, the cannula assembly further has an output port communicated with the infusion cavity, the output port is located at the end of the cannula assembly close to the base, and the position of the flow passage gap corresponds to the position of the output port.

[0020] In one of the embodiments, the central axis of the communication hole is a first central axis, the central axis of the impeller is a second central axis arranged at an acute angle relative to the first central axis, the aperture of the communication hole gradually decreases in the direction of fluid flowing in the communication hole, and the distance from the first central axis to the second central axis gradually decreases.

[0021] One technical effect of one embodiment of the present application is that when blood enters into the accommodation cavity, the relative position and special shape of the convex surface and the end surface will play a good guiding effect on the blood, thus improving the contact opportunity between the blood and the convex surface and the end surface, so that the blood is easy to flow through the joint space between the convex surface and the end surface. On the one hand, the blood will have more opportunities to effectively flush the viscous or coagulated material in the joint space, avoiding the viscous or coagulated material from gathering in the joint space for a long time, thereby reducing the probability of forming a thrombus. On the other hand, the speed and flow of the blood flowing through the joint space are increased, improving the flowability of the blood itself and the flushing force of the blood in the joint space, further reducing the probability of forming a thrombus. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown.

[0023] Figure 2 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown. Figure 1 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown.

[0024] Figure 3 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown. Figure 1 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown.

[0025] Figure 4 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown. Figure 1 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown.

[0026] Figure 5 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown. Figure 1 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown.

[0027] Figure 6 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown. Figure 1 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown.

[0028] Figure 7 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown. Figure 1 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown.

[0029] Figure 8 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown. Figure 1 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown.

[0030] Figure 9 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown. Figure 8 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown.

[0031] Figure 10 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown. Figure 8 A perspective structural schematic diagram of a blood pump provided for an embodiment is shown. DETAILED DESCRIPTION

[0032] For the purposes of promoting an understanding of the principles of the application, reference will now be made to the embodiments illustrated in the drawings. It is expressly understood that the drawings are presented for the purposes of illustration and teaching the disclosed embodiments and are not intended as limitations on the scope of the application. In the drawings:

[0033] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It is also possible in the present application that steps can be executed in different sequence, where this is explicitly indicated, or where this is apparent from this disclosure in general. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It is also possible in the present application that steps can be executed in different sequence, where this is explicitly indicated, or where this is apparent from this disclosure in general.

[0034] Referring to Figure 1 , Figure 2 and Figure 3 , one embodiment of the present application provides a blood pump 10, in particular an intravascular blood pump, which can be placed at a heart valve of a human body, such as an aortic valve, so that blood can be pumped into an artery by the blood pump 10. The blood pump 10 comprises a cannula assembly 100, an impeller 200, a rotating shaft 300 and a base 400.

[0035] Referring to Figure 3 , Figure 4 and Figure 6 , in some embodiments, the cannula assembly 100 comprises a first sleeve 110 and a second sleeve 120, which are coaxially arranged and detachably connected. The second sleeve 120 is arranged on the base 400, so that the first sleeve 110 is farther away from the base 400 than the second sleeve 120. Both the first sleeve 110 and the second sleeve 120 can be cylindrical, and the lumens of the first sleeve 110 and the second sleeve 120 together form a delivery lumen 130. An end of the delivery lumen 130 away from the base 400 forms an inlet 131, which is located on the first sleeve 110 and through which blood from outside enters the delivery lumen 130. An outlet 121 is formed on the wall of the second sleeve 120, which is arranged close to the base 400 and communicates with the delivery lumen 130, so that blood in the delivery lumen 130 flows out of the blood pump 10 through the outlet 121.

[0036] The first sleeve 110 includes a tube body 111 and inner pieces 112. The tube body 111 is connected with the second sleeve 120, and the lumen of the tube body 111 and the lumen of the second sleeve 120 together form the infusion lumen 130. The number of the inner pieces 112 is plural, for example, the number of the inner pieces 112 can be three, four, etc. The inner pieces 112 are arranged on the inner wall surface of the tube body 111 (i.e. the lumen wall of the infusion lumen 130) and at the position of the tube body 111 close to the second sleeve 120. The inner pieces 112 are fixed on the inner wall surface of the tube body 111, so that the inner pieces 112 protrude a certain length along the radial direction of the tube body 111 relative to the inner wall surface. Therefore, the inner pieces 112 have a fixed end and a free end. The fixed end is fixed on the inner wall surface of the tube body 111, and the free end is spaced apart from the inner wall surface along the radial direction of the tube body 111. The free ends of the inner pieces 112 are not in contact with each other, so that the free ends of all the inner pieces 112 together enclose the mounting cavity 113. The central axis of the mounting cavity 113 coincides with the central axis of the tube body 111. In the direction of the second sleeve 120 pointing to the first sleeve 110, the caliber of the mounting cavity 113 gradually decreases.

[0037] The cannula assembly 100 is arranged in a segmented manner including the detachably connected first sleeve 110 and the second sleeve 120, which can facilitate the installation of the impeller 200. It can be understood that the cannula assembly 100 is not limited to including the detachably connected first sleeve 110 and the second sleeve 120. In some embodiments, the first sleeve 110 and the second sleeve 120 are not detachable and are integrated as a whole, i.e. the first sleeve 110 and the second sleeve 120 constitute an integral whole, i.e. one sleeve replaces the first sleeve 110 and the second sleeve 120. Therefore, the infusion lumen 130 is the lumen of the sleeve.

[0038] Referring to Figure 3 , Figure 5 and Figure 7 , in some embodiments, the impeller 200 is arranged to be rotatable in the infusion lumen 130. The rotation axis of the impeller 200 coincides with the central axis of the infusion lumen 130, and the rotation axis of the impeller 200 coincides with the central axis of the impeller 200.

[0039] The impeller 200 comprises a first blade 210, a second blade 220 and a rotating body 230, both the first blade 210 and the second blade 220 are fixed on the rotating body 230. The rotating body 230 has a rotor 233, the rotor 233 is a permanent magnet. Specifically, the rotor 233 is accommodated in the interior of the rotating body 230; the rotor 233 can be a Halbach array magnet. Wherein, the rotor 233 can rotate under the action of the rotating magnetic field generated by the base 400, so that the rotating body 230 rotates, and then the first blade 210 and the second blade 220 both rotate with the rotating body 230. The rotating body 230 is provided with a communication hole 232 and an accommodation cavity 234, the communication hole 232 communicates the accommodation cavity 234 and the infusion cavity 130, the blood in the infusion cavity 130 can flow into the accommodation cavity 234 through the communication hole 232. Specifically, the accommodation cavity 234 extends along the central axis of the impeller 200, and the communication hole 232 extends along the direction inclined to the central axis of the impeller 200.

[0040] Referring to Figure 6 and Figure 7 , for the convenience of description, the central axis of the communication hole 232 is recorded as a first central axis, and the central axis of the impeller 200 is recorded as a second central axis, the first central axis is arranged at an acute angle with the second axis. Taking the flow direction of the blood in the communication hole 232 as the reference direction, then along the direction of the blood flowing in the communication hole 232, the hole diameter of the communication hole 232 gradually decreases, and the distance from the first central axis to the second central axis gradually decreases. In a popular way, the communication hole 232 is roughly conical, so that the communication hole 232 has an opening with a smaller diameter and an opening with a larger diameter, the opening with a smaller diameter communicates with the accommodation cavity 234, and the opening with a larger diameter communicates with the infusion cavity 130, so that the communication hole 232 has a good flow guiding effect on the blood, so that the blood in the infusion cavity 130 enters the accommodation cavity 234 at a reasonable flow rate.

[0041] Referring to Figure 5 , Figure 6 and Figure 7 , the first blade 210 can be spiral and generally extend along the axial direction of the rotating body 230, the first blade 210 is located in the infusion cavity 130, when the first blade 210 rotates with the rotating body 230, the first blade 210 will generate a pumping force, so that the external blood enters the infusion cavity 130 from the input port 131 and is discharged from the output port 121.

[0042] The rotating body 230 also has a mounting surface 231 arranged towards the base 400, the mounting surface 231 and the base 400 are arranged along the axial direction of the rotating body 230, and a gap is formed between the mounting surface 231 and the base 400, which is referred to as a flow gap 240, and the flow gap 240 is in communication with the accommodation cavity 234. Specifically, the position of the flow gap 240 corresponds to the position of the output port 121. The second blades 220 are arranged on the mounting surface 231 and extend along the radial direction of the rotating body 230, and the second blades 220 are at least partially accommodated in the flow gap 240, and in the illustrated embodiment, the second blades 220 are entirely located in the flow gap 240. The number of the second blades 220 is multiple, and the second blades 220 can be arranged at intervals along the circumferential direction of the rotating body 230. Among them, the mounting surface 231 is perpendicular to the central axis of the impeller 200. When the second blades 220 rotate with the rotating body 230, the second blades 220 will also generate a pumping force, so that the blood in the accommodation cavity 234 is quickly discharged from the output port 121 under the action of the pumping force.

[0043] Referring to Figure 6 and Figure 7 Therefore, when the entire impeller 200 rotates, the external blood will enter the infusion cavity 130 from the input port 131, and the blood in the infusion cavity 130 will be divided into two streams, wherein the first stream of blood is directly discharged from the output port 121, and the flow trajectory of the first stream of blood can be recorded as: infusion cavity 130-output port 121; the second stream of blood enters the accommodation cavity 234 through the communication hole 232, and is discharged from the output port 121 after passing through the flow gap 240, so the flow trajectory of the second stream of blood can be recorded as: infusion cavity 130-communication hole 232-accommodation cavity 234-flow gap 240-output port 121. Figure 6 and Figure 7 The dashed arrow indicates the flow trajectory of the blood. In view of the fact that the impeller 200 includes the second blades 220, under the action of the pumping force generated by the second blades 220, the speed and flow rate of the blood flow through the accommodation cavity 234 can be increased.

[0044] Referring to Figure 3 , Figure 6 and Figure 7 In some embodiments, the rotating shaft 300 is fixedly connected with the impeller 200. The rotating shaft 300 is arranged through the rotating body 230, the central axis of the rotating shaft 300 coincides with the central axis of the impeller 200, and the rotating shaft 300 can be fixed with the rotating body 230 by bonding. The end of the rotating shaft 300 away from the base 400 is a conical body 310, the conical body 310 extends into the first sleeve 110, and the conical body 310 cooperates with the mounting cavity 113 in the first sleeve 110, and when the rotating shaft 300 rotates with the impeller 200, the conical body 310 will rotate in the mounting cavity 113.

[0045] The mounting cavity 113 is matched with the shape and size of the conical body 310. On one hand, the mounting cavity 113 can limit the axial position of the rotating shaft 300 when the rotating shaft 300 is matched with the mounting cavity 113. On the other hand, the mounting cavity 113 can provide a fulcrum for the end of the rotating shaft 300, thereby improving the stability of the rotating shaft 300 and the impeller 200 during rotation. The free end of the inner sheet 112 can be coated with a diamond coating, and the rotating shaft 300 can be made of ceramic material. When the rotating shaft 300 contacts the diamond coating, the frictional resistance of the rotating shaft 300 during rotation can be reduced, and the smoothness of the rotating shaft 300 and the impeller 200 during rotation can be improved.

[0046] The rotating shaft 300 further includes a protruding head 320 located at the end of the rotating shaft 300 close to the base 400. The protruding head 320 can be spherical or spherical segment-shaped, and can also be cylindrical or the like. The protruding head 320 is accommodated in the receiving cavity 234. The protruding head 320 has a convex surface 321 protruding along the axial direction of the rotating shaft 300, and the convex surface 321 abuts against the base 400.

[0047] Referring to Figure 3 , Figure 6 and Figure 7 , in some embodiments, the base 400 includes a carrier 410, a support shaft 420, and a stator 430. The stator 430 is arranged in the carrier 410. When the stator 430 is supplied with electric energy, the stator 430 can generate a rotating magnetic field to drive the rotor 233 to rotate, thereby driving the entire impeller 200 to rotate. The second sleeve 120 is sleeved and fixed on the carrier 410. The carrier 410 has a support surface 411 spaced apart from the mounting surface 231 on the rotating body 230, so that the above-mentioned flow gap 240 is located between the support surface 411 and the mounting surface 231. The support shaft 420 is connected with the support surface 411 and protrudes relative to the support surface 411, so that the support shaft 420 protrudes relative to the support surface 411 by a certain length along the axial direction of the carrier 410. The support shaft 420 is accommodated in the receiving cavity 234, and the support shaft 420 is spaced apart from the cavity wall of the receiving cavity 234, i.e. the support shaft 420 does not form a contact relationship with the cavity wall of the receiving cavity 234. In other words, the support shaft 420 does not fill the entire receiving cavity 234, so as to ensure that the receiving cavity 234 still has space for blood flow. The support shaft 420 coincides with the central axis of the rotating shaft 300, and the end of the support shaft 420 abuts against the rotating shaft 300, i.e. the support shaft 420 supports the rotating shaft 300 and the impeller 200, and ensures that the flow gap 240 exists between the mounting surface 231 and the support surface 411.

[0048] Referring to Figure 7 , Figure 8 and Figure 9The end of the support shaft 420 away from the support surface 411 has an end surface 421, which is recessed along the axial direction of the support shaft 420 to form a concave cavity 421a. The shape of the concave cavity 421a is adapted to the shape of the convex head 320. The convex head 320 can be matched with the concave cavity 421a, and the convex head 320 can rotate in the concave cavity 421a. The concave cavity 421a can well position the convex head 320 and the entire rotating shaft 300 in the radial direction. In view of the matching of the convex head 320 and the concave cavity 421a, the convex surface 321 of the convex head 320 abuts against the end surface 421. The convex surface 321 is at least partially accommodated in the concave cavity 421a, for example, the convex surface 321 can be entirely located in the concave cavity 421a, or a part of the convex surface 321 is located in the concave cavity 421a and the other part of the convex surface 321 is located outside the concave cavity 421a. The smaller opening of the communication hole 232 is farther away from the flow gap 240 than the end surface 421 of the support shaft 420. In other words, the smaller opening of the communication hole 232 is located obliquely above the end surface 421. When the blood in the infusion cavity 130 flows into the accommodation cavity 234 through the communication hole 232, the blood flowing out of the smaller opening of the communication hole 232 will flow well to the convex head 320 and the end surface 421.

[0049] In some embodiments, the rotating shaft 300 is made of ceramic material, and a diamond layer is arranged on the end surface 421 of the support shaft 420. In this way, the frictional resistance of the rotating shaft 300 during rotation is reduced, and the smoothness of the rotating shaft 300 and the impeller 200 during rotation is improved.

[0050] When the blood enters the accommodation cavity 234, in view of the matching of the rotating shaft 300 and the concave cavity 421a on the support shaft 420 through the convex head 320, the relative position and specific shape of the convex surface 321 and the end surface 421 will well guide the blood flow. In this way, the contact opportunity of the blood with the abutting position of the support shaft 420 and the rotating shaft 300 is improved, so that the blood can easily flow between the support shaft 420 and the rotating shaft 300. On the one hand, the blood will have more opportunities to effectively flush the abutting position of the support shaft 420 and the rotating shaft 300, so as to avoid the formation of blood clots due to the long-term aggregation of viscous or coagulated substances in the blood at the abutting position. On the other hand, the speed and flow of the blood flowing through the abutting position are increased, which not only improves the flowability of the blood, but also improves the flushing force of the blood at the abutting position, further avoiding the aggregation of viscous or coagulated substances at the abutting position to form blood clots. Therefore, the matching mode of the convex head 320 and the concave cavity 421a can effectively reduce the probability of occurrence of blood clots.

[0051] It is to be noted that, in view of the presence of the second blade 220, the velocity and flow rate of the blood flowing through the accommodation cavity 234 will be increased, thereby further increasing the flowability and scouring force of the blood in the accommodation cavity 234, and also effectively reducing the probability of thrombosis in the accommodation cavity 234. The diamond layer attached to the end face 421 will also reduce the flow resistance of the blood in the concave cavity 421a, enhance the flowability and scouring force of the blood to reduce the probability of thrombosis, and also reduce the heat generated by friction between the rotating shaft 300 and the support shaft 420, thereby improving the service life of the entire blood pump 10. Of course, the blood flowing between the rotating shaft 300 and the support shaft 420 will also carry away the friction heat, further improving the service life of the blood pump 10. When the flow rate of the blood in the accommodation cavity 234 is large, more friction heat can be carried away.

[0052] In some embodiments, the support shaft 420 also has an outer lateral circumferential surface 422 and a flow guide surface 423. The outer lateral circumferential surface 422 is an annular surface, and the outer lateral circumferential surface 422 is connected to the periphery of the end face 421, so that the outer lateral circumferential surface 422 is arranged around the end face 421. The end of the support shaft 420 away from the support surface 411 is recessed to form a flow guide groove 424, which penetrates the end face 421 and the outer lateral circumferential surface 422 and communicates with the concave cavity 421a. Obviously, the flow guide groove 424 also communicates with the accommodation cavity 234. The number of flow guide grooves 424 is multiple, for example, two, three or more than four, and the multiple flow guide grooves 424 are uniformly spaced along the circumferential direction of the support shaft 420. The flow guide surface 423 is connected between the outer lateral circumferential surface 422 and the end face 421 and defines part of the boundary of the flow guide groove 424. Among them, the flow guide surface 423 is arranged obliquely relative to the central axis of the support shaft 420. The flow guide surface 423 intersects the central axis of the support shaft 420 at an acute angle. In the direction from the end away from the support surface 411 to the end close to the support surface 411, the distance from the flow guide surface 423 to the central axis of the support shaft 420 gradually increases, in other words, the flow guide surface 423 gradually moves away from the central axis of the support shaft 420 in the direction away from the rotating shaft 300. In a popular way, the flow guide surface 423 is arranged obliquely downward, so that the part of the flow guide groove 424 close to the end face 421 has a relatively large recess depth, and the part of the flow guide groove 424 away from the end face 421 has a relatively small recess depth.

[0053] Referring to Figure 8 , Figure 9 and Figure 10The guide surface 423 includes a middle guide section 423a and two edge guide sections 423b arranged along the circumference of the support shaft 420, and the middle guide section 423a is connected between the two edge guide sections 423b. Specifically, the middle guide section 423a protrudes towards the direction away from the central axis of the support shaft 420, so that the middle guide section 423a is a convex surface; and the edge guide section 423b is recessed towards the direction close to the central axis of the support shaft 420, so that the edge guide section 423b is a concave surface. It can be understood that the guide groove 424 is in a state of middle high and edge low. In the direction away from the rotating shaft 300, the length A occupied by the middle guide section 423a in the circumference of the support shaft 420 gradually increases, which can be popularly understood as the middle guide section 423a is approximately a convex arc-shaped isosceles trapezoid.

[0054] Due to the arrangement of the guide groove 424, the guide groove 424 penetrates the end surface 421 of the support shaft 420, so that the contact area between the convex surface 321 of the convex head 320 and the support shaft 420 is reduced; and the guide surface 423 is arranged in an inclined state, so that the recessed depth of the part of the guide groove 424 close to the end surface 421 is relatively large, and then the area of the end surface 421 removed due to being penetrated by the guide groove 424 is relatively large, further reducing the contact area between the convex surface 321 and the support shaft 420, and finally reducing the probability of thrombus formation. Moreover, the blood in the accommodation cavity 234 flows in the guide groove 424, so that the blood in the guide groove 424 will increase the contact opportunity with the abutting part of the support shaft 420 and the rotating shaft 300, further reducing the probability of thrombus formation.

[0055] Due to the middle guide section 423a being a convex surface and the edge guide section 423b being a concave surface, when the blood flows in the guide groove 424, the blood will flow from the middle high position to the edge low position, that is, the blood will flow from the middle guide section 423a to the edge guide section 423b. In short, in the process of flowing from top to bottom along the axial direction of the support shaft 420, the blood will also flow left and right along the circumferential direction of the support shaft 420, which will increase the turbulence of the blood in the flowing process, so that the blood generates vortex flow, thereby reasonably prolonging the flushing time and increasing the flushing force of the blood on the abutting part of the support shaft 420 and the rotating shaft 300, preventing "blood blockage" in the joint space, and reducing the probability of thrombus formation. In the case that the middle guide section 423a is approximately a convex arc-shaped isosceles trapezoid, the blood of the edge guide section 423b flows obliquely downward along the direction at an angle with the axial direction of the support shaft 420, so that the blood flow of the edge guide section 423b has both the flow direction along the axial direction of the support shaft 420 and the flow direction along the circumferential direction of the support shaft 420, which also enhances the vortex intensity of the blood and reduces the probability of thrombus formation.

[0056] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0057] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the present application patent shall be subject to the appended claims.

Claims

1. A blood pump, characterized in that, The application relates to a catheter assembly, comprising: a catheter assembly having a transfusion cavity; a vane rotatably arranged in the transfusion cavity, the vane being provided with a receiving cavity and a communication hole, the communication hole being in communication with the transfusion cavity and the receiving cavity, the communication hole having a gradually decreasing hole diameter along the direction of blood flow in the communication hole, so that the communication hole has an opening with a small hole diameter and an opening with a large hole diameter, the opening with the large hole diameter being in communication with the transfusion cavity, and the opening with the small hole diameter being in communication with the receiving cavity; a rotating shaft fixedly connected with the vane and having a convex head located in the receiving cavity at one end; a base connected with the catheter assembly, the base comprising a supporting shaft, an end surface of the supporting shaft surrounding a concave cavity matched with the convex head, a flow-through gap being formed between the vane and the base, the flow-through gap being in communication with the receiving cavity, the opening with the small hole diameter facing the concave cavity, and the opening with the small hole diameter being farther away from the flow-through gap than the end surface of the supporting shaft. The convex head is spherical or spheroid.

2. The blood pump of claim 1, wherein, The convex head has a convex surface abutting against the end surface, at least part of the convex surface being accommodated in the concave cavity.

3. The blood pump of claim 1, wherein, The supporting shaft further has an outer circumferential surface located outside the receiving cavity and arranged around the end surface, and a flow guide surface, the supporting shaft being further provided with a flow guide groove penetrating through the outer circumferential surface and the end surface and in communication with the concave cavity, the flow guide surface connecting the outer circumferential surface and the end surface and defining part of the boundary of the flow guide groove.

4. The blood pump of claim 1, wherein, The distance of the flow guide surface to the central axis of the supporting shaft gradually increases in the direction away from the rotating shaft.

5. The blood pump of claim 4, wherein, The flow guide surface comprises an intermediate flow guide section and two edge flow guide sections arranged along the circumference of the supporting shaft, the intermediate flow guide section being connected between the two edge flow guide sections, the intermediate flow guide section being convex in the direction away from the central axis of the supporting shaft, and the edge flow guide sections being concave in the direction close to the central axis of the supporting shaft.

6. The blood pump of claim 4, wherein, The length of the intermediate flow guide section along the circumference of the supporting shaft gradually increases in the direction away from the rotating shaft.

7. The blood pump of claim 6, wherein, The number of the flow guide grooves is multiple, and the multiple flow guide grooves are arranged at intervals along the circumference of the supporting shaft.

8. The blood pump of claim 4, wherein, The base has a supporting surface, the supporting shaft is connected to the supporting surface and protrudes relative to the supporting surface, the vane further comprises a rotating body, a first vane and a second vane arranged on the rotating body, the receiving cavity is arranged in the rotating body, the flow-through gap is located between the rotating body and the supporting surface, the first vane is located in the transfusion cavity, and the second vane is at least partially located in the flow-through gap.

9. The blood pump of claim 1, wherein, A plurality of inner sheets are arranged in the transfusion cavity, the inner sheets protrude relative to the cavity wall surface of the transfusion cavity, and the plurality of inner sheets surround an installation cavity matched with the rotating shaft.

10. The blood pump of claim 1, wherein, The catheter assembly further has an output port in communication with the transfusion cavity, the output port is located at one end of the catheter assembly close to the base, and the position of the flow-through gap corresponds to the position of the output port.

11. The blood pump of claim 1, wherein, The outlet position of the flow-through gap corresponds to the position of the output port in the radial direction of the catheter assembly.

12. The blood pump of claim 11, wherein, ​ 13. The blood pump of claim 1, wherein, The center axis of the communication hole is a first center axis, the center axis of the impeller is a second center axis arranged at an acute angle with the first center axis, and the distance from the first center axis to the second center axis gradually decreases.

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