Interventional catheter pump

Abstract

The present invention discloses an interventional catheter pump, comprising: a blood pumping system and a perfusion system, wherein the blood pumping system comprises a motor, an impeller, a blood pumping catheter, and a blood inlet and a blood outlet arranged at both ends of the blood pumping catheter, the impeller is mounted on the motor, and the motor is used to drive the impeller to rotate and do work, so as to pump blood from the blood inlet into the blood pumping catheter and flow out from the blood outlet; the perfusion system comprises a perfusion pipe, and the perfusion pipe is connected to the motor; the motor comprises a motor housing and a motor stator arranged in the motor housing, a perfusion channel is arranged between the motor housing and the motor stator, and a perfusion hole connected to the perfusion channel is arranged at one end of the motor housing, and the perfusion pipe leads to the blood outlet through the perfusion hole and the perfusion channel, thereby forming a perfusion passage. The present invention can greatly reduce the waterproof performance requirements of the motor, enhance the service life, and at the same time increase the area of ​​the perfusion channel, reduce the bearing pressure of the perfusion system, and improve the safety of use.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an interventional catheter pump. Background Art

[0002] Acute heart failure refers to a condition in which organic heart disease develops to the point where myocardial contractility is weakened, causing the heart to be unable to fully discharge the blood returning to the heart, resulting in reduced cardiac output, and causing severe blood supply insufficiency in the pulmonary venous congestion and arterial system. Due to the suddenness and severity of acute heart failure, a treatment method that can quickly provide support to patients is needed, so interventional catheter pumps have become the main treatment option for acute heart failure.

[0003] Interventional catheter pumps do not require complicated thoracotomy. They can enter the patient's ventricle along the blood vessels, increase blood flow, enhance blood perfusion, and reduce myocardial oxygen consumption. In the short term, they can help patients with acute heart failure enhance their heart pumping function and reduce the burden on their hearts. Due to the special implantation method of the interventional catheter pump, the size of the interventional catheter pump must be very small, which places high demands on the core component of the interventional catheter pump - the motor.

[0004] At present, the motors of interventional catheter pumps are generally divided into two types: internal motors and external motors. The external motor is larger and needs to be connected to the impeller of the internal catheter pump through a long flexible shaft to drive the impeller to rotate and achieve the blood pumping function; however, due to the low transmission efficiency of the flexible shaft and the short service life, these shortcomings make the internal motor structure the mainstream product of interventional catheter pumps.

[0005] However, there are also many pain points in the internal motor. Due to the size limitation of the interventional catheter pump, the diameter of the internal motor is generally no more than 6mm. Also due to the size of the interventional catheter pump, the impeller diameter is also very small. Therefore, in order to reduce the burden on the patient's heart and enhance the heart's blood pumping, the speed of the internal motor must reach tens of thousands of revolutions per minute. Such a high speed will cause the motor temperature to rise, threatening the patient's life safety. Therefore, the internal motor is equipped with a perfusion system, which injects perfusion fluid such as anticoagulant water from outside the body into the internal motor through a pipeline to reduce the motor's heating temperature and reduce the probability of coagulation.

[0006] However, the existing perfusion system also has some defects. In order to achieve the sealing of the motor in the body and prevent blood from entering the motor, the existing perfusion method is to let the perfusion liquid flow into the motor and out from between the bearing and the shaft, and overcome the blood pressure and flow resistance. Therefore, this poses a higher challenge to the motor. The motor must have a strong waterproof ability, which greatly increases the manufacturing cost of the interventional pump. At the same time, because the pressure of the perfusion liquid is very high, the bearing pressure of the perfusion system is also required to be very high. It is easy for the catheter to be burst by the pressure of the perfusion liquid, and the perfusion liquid to leak, which will seriously threaten the safety of the patient. Summary of the invention

[0007] The problem to be solved by the present invention is to provide an invasive catheter pump to overcome the defects of the existing invasive catheter pumps, such as high requirements for motor waterproofing, short service life, and high perfusion fluid pressure that easily causes safety accidents.

[0008] The technical solution adopted by the present invention to solve its technical problems is: an interventional catheter pump, comprising: a blood pumping system and a perfusion system, the blood pumping system comprising a motor, an impeller, a blood pumping catheter, and a blood inlet and a blood outlet arranged at both ends of the blood pumping catheter, the impeller is installed on the motor, and the motor is used to drive the impeller to rotate and do work, so as to pump blood from the blood inlet into the blood pumping catheter and flow out from the blood outlet; the perfusion system comprises a perfusion tube, and the perfusion tube is connected to the motor; the motor comprises a motor housing and a motor stator arranged in the motor housing, a perfusion channel is provided between the motor housing and the motor stator, and a perfusion hole connected to the perfusion channel is provided at one end of the motor housing, and the perfusion tube leads to the blood outlet through the perfusion hole and the perfusion channel, thereby forming a perfusion passage.

[0009] As a further improvement of the present invention, the motor housing is a hollow cylinder with a first end cover provided at one end thereof, one end of the motor stator is sealed and connected to the first end cover, the outer diameter of the motor stator is smaller than the inner diameter of the motor housing, the injection channel is formed by the gap between the inner circumferential surface of the motor housing and the outer circumferential surface of the motor stator, and the injection hole is provided on the first end cover.

[0010] As a further improvement of the present invention, the motor further comprises a motor rotor, which is coaxially rotatably arranged in the motor stator. The motor rotor is provided with a rotating shaft, one end of which extends out of the motor housing and is fixedly connected to the impeller.

[0011] As a further improvement of the present invention, a second end cover is provided at the other end of the motor housing, a through hole is provided on the second end cover, the rotating shaft is gap-fitted in the through hole, and the perfusion channel is connected to the blood outlet through the gap between the rotating shaft and the second end cover.

[0012] As a further improvement of the present invention, a dynamic seal is installed between the other end of the motor stator and the rotating shaft.

[0013] As a further improvement of the present invention, the dynamic seal includes a sealing shell with a hollow interior and a magnetic fluid. The sealing shell is sealingly connected to the other end of the motor stator and is mounted on the rotating shaft. The magnetic fluid is contained in the sealing shell and wraps the outer circumferential surface of the corresponding part of the rotating shaft.

[0014] As a further improvement of the present invention, the motor rotor is further provided with rotor magnets distributed around the rotating shaft, and the rotor magnets are composed of multiple permanent magnets arranged in a Halbach array.

[0015] As a further improvement of the present invention, a wire guide channel is provided between the motor housing and the motor stator, and a wire guide hole connected to the wire guide channel is provided at one end of the motor housing, and the perfusion tube is connected to the wire guide hole.

[0016] As a further improvement of the present invention, the distal end of the blood pumping catheter is fixedly connected to an inlet tube, the blood inlet is arranged on the inlet tube, and a pigtail tube is installed at the distal end of the inlet tube; an impeller housing is fixedly connected between the proximal end of the blood pumping catheter and the motor housing, the impeller is located in the impeller housing, and the blood outlet is arranged on the impeller housing.

[0017] As a further improvement of the present invention, the interventional catheter pump further includes a catheter, the catheter is fixedly connected to the motor housing, the perfusion tube is arranged in the catheter, and a cable for supplying power to the motor is also arranged in the catheter.

[0018] The beneficial effects of the present invention are:

[0019] 1. The interventional catheter pump of the present invention is provided with a perfusion channel between the motor housing and the motor stator. The perfusion fluid first enters the perfusion channel through the perfusion hole, then flows out of the motor, and enters the blood from the blood outlet. The flowing perfusion fluid can not only take away the heat generated when the motor rotates at high speed, but also bring the heparin water in the perfusion fluid into the blood, playing an anticoagulant role.

[0020] 2. Since the perfusion liquid in the present invention flows along the perfusion flow channel between the motor housing and the motor stator, rather than inside the motor, the waterproof performance requirements of the motor are greatly reduced, the service life of the motor is enhanced, and the area of ​​the perfusion flow channel is increased, thereby greatly reducing the perfusion pressure of the perfusion liquid, reducing the bearing pressure of the perfusion system, avoiding the risk of the perfusion tube being burst by the perfusion liquid pressure and causing the perfusion liquid to leak, improving the safety of use, and making the long-term implantation assistance of the interventional catheter pump possible;

[0021] 3. The present invention installs a dynamic seal between the motor stator and the rotating shaft, and utilizes the characteristics of the magnetic fluid so that during the rotation of the rotating shaft, the magnetic fluid still fills the sealing housing and always wraps the rotating shaft, so that blood and perfusion fluid cannot enter the motor through the gap between the rotating shaft and the front end of the motor stator, thereby achieving a dynamic sealing function, reducing the waterproof requirements and costs of the motor, and increasing the service life of the motor;

[0022] 4. The rotor magnet in the present invention is composed of multiple permanent magnets arranged in a Halbach array, which can greatly enhance the magnetic force on the outside of the motor rotor and improve the efficiency of the motor. Under the same power requirement, the speed of the motor can be reduced, further improving the service life of the motor and the interventional catheter pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a stereoscopic diagram of an interventional catheter pump of the present invention;

[0024] Figure 2 A three-dimensional diagram of the assembly of the motor, impeller and impeller housing of the interventional catheter pump of the present invention;

[0025] Figure 3 An exploded view of the motor, impeller and impeller housing of the interventional catheter pump of the present invention;

[0026] Figure 4 A cross-sectional view of the motor, impeller and impeller housing of the interventional catheter pump of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged view of part A in the middle;

[0028] Figure 6 It is a cross-sectional view of the catheter of the interventional catheter pump of the present invention and the perfusion tube and cable inside it;

[0029] Figure 7 A three-dimensional diagram of the rotor magnet of the interventional catheter pump of the present invention;

[0030] Figure 8 A three-dimensional diagram of another embodiment of the rotor magnet of the interventional catheter pump of the present invention;

[0031] Fig. 9 A three-dimensional diagram of another embodiment of the rotor magnet of the interventional catheter pump of the present invention;

[0032] Fig.10 It is a schematic diagram of the interventional catheter pump of the present invention applied to the heart;

[0033] in, Figure 4 The direction indicated by the arrow in the middle represents the flow direction of the perfusion fluid.

[0034] Combined with the accompanying drawings, the following description is given:

[0035] 1. Motor; 11. Motor housing; 111. First end cover; 112. Second end cover; 1121. Through hole; 12. Motor stator; 121. Raised rib; 13. Infusion channel; 14. Infusion hole; 15. Motor rotor; 151. Rotating shaft; 152. Rotor magnet; 16. Dynamic seal; 161. Sealing shell; 162. Magnetic fluid; 17. Guide wire channel; 18. Guide wire hole; 19. Bearing; 2. Impeller; 3. Blood pump catheter; 4. Inlet pipe; 41. Blood inlet; 5. Impeller housing; 51. Blood outlet; 6. Infusion tube; 7. Pigtail tube; 8. Catheter; 9. Cable. DETAILED DESCRIPTION

[0036] A preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.

[0037] It should be noted that the terms "proximal", "distal", "front" and "back" used in the present invention are relative to the doctor who operates the interventional catheter pump. The terms "proximal" and "back" refer to the parts that are relatively close to the doctor, and the terms "distal" and "front" refer to the parts that are relatively far away from the doctor. For example, the extracorporeal part of the catheter 8 is located at the proximal or rear end, and the blood pumping system is located at the distal or front end. It should be understood that the directions "proximal", "distal", "front" and "back" are defined for the convenience of description, and the interventional catheter pump can be used in many directions and positions, so these terms expressing relative positional relationships are not restrictive and absolute.

[0038] See also Figures 1 to 10 The present invention provides an interventional catheter pump, including a blood pumping system and a perfusion system. The blood pumping system includes a motor 1, an impeller 2, a blood pumping catheter 3, and a blood inlet 41 and a blood outlet 51 arranged at both ends of the blood pumping catheter 3.

[0039] Specifically, in this embodiment, the distal end of the blood pumping catheter 3 is fixedly connected with an inlet tube 4, and the blood inlet 41 is formed by a number of grille holes opened along the circumferential direction of the inlet tube 4. A pigtail tube 7 is fixedly installed at the distal end of the inlet tube 4. The pigtail tube 7 can reduce the scratch damage to the inner wall of the blood vessel and the corresponding tissue during the implantation of the interventional catheter pump, reduce the risk of complications, and also help to maintain a specific position in the ventricle, not easy to move, and ensure the stable operation of the interventional catheter pump. An impeller housing 5 is fixedly connected between the proximal end of the blood pumping catheter 3 and the motor housing 11 of the motor 1. The impeller housing 5 is tubular, and the impeller 2 is located in the impeller housing 5 and connected to the motor 1; the blood outlet 51 is formed by a number of grille holes opened along the circumferential direction of the impeller housing 5.

[0040] When the motor 1 is working, it can drive the impeller 2 to rotate and do work. Under the action of the centrifugal force generated by the impeller 2 , the blood is pumped from the blood inlet 41 into the blood pumping conduit 3 and flows out from the blood outlet 51 .

[0041] Exemplarily, the blood pumping catheter 3 may be an artificial blood vessel.

[0042] Further, the perfusion system includes a perfusion tube 6, and the distal end of the perfusion tube 6 is connected to the motor 1. The motor 1 includes a motor housing 11 and a motor stator 12 disposed in the motor housing 11, a perfusion channel 13 is disposed between the motor housing 11 and the motor stator 12, and a perfusion hole 14 connected to the perfusion channel 13 is disposed at the rear end of the motor housing 11, and the perfusion tube 6 leads to the blood outlet 51 through the perfusion hole 14 and the perfusion channel 13, thereby forming a perfusion passage.

[0043] After the interventional catheter pump is implanted in the body, perfusion fluid can be injected into the interventional catheter pump through the perfusion tube 6. The perfusion fluid first enters the perfusion channel 13 between the motor housing 11 and the motor stator 12 through the perfusion hole 14, then flows out of the motor 1, and enters the blood from the blood outlet 51. The flowing perfusion fluid can not only take away the heat generated by the high-speed rotation of the motor 1, but also bring the heparin water in the perfusion fluid into the blood, thereby playing an anticoagulant role. At the same time, since the perfusion liquid flows along the perfusion channel 13 between the motor housing 11 and the motor stator 12, rather than the inside of the motor 1 (referring to the space between the motor stator 12 and the motor rotor 15), the waterproof performance requirements of the motor 1 are greatly reduced, and the service life of the motor 1 is enhanced; in addition, the present invention greatly increases the area of ​​the perfusion channel 13 by setting the perfusion channel 13 on the inside of the motor housing 11 compared with the traditional way of setting it inside the motor 1, thereby greatly reducing the perfusion pressure of the perfusion liquid and reducing the bearing pressure of the perfusion system, thereby avoiding the risk of leakage of the perfusion liquid caused by the perfusion tube 6 being burst by the perfusion liquid pressure, thereby improving the safety of use and making long-term implantation assistance of the interventional catheter pump possible.

[0044] In the present invention, the interventional catheter pump also includes a catheter 8, the distal end of which is fixedly connected to the rear end of the motor housing 11, the perfusion tube 6 is arranged in the catheter 8, and a cable 9 for powering the motor 1 is also arranged in the catheter 8.

[0045] See also Figures 2 to 4 The motor housing 11 is a hollow cylindrical shape, and the motor stator 12 is also a hollow cylindrical shape. The motor stator 12 is coaxially fixed in the motor housing 11, and the outer diameter of the motor stator 12 is smaller than the inner diameter of the motor housing 11. The perfusion channel 13 is formed by the gap between the inner circumference of the motor housing 11 and the outer circumference of the motor stator 12.

[0046] The rear end of the motor housing 11 is provided with a first end cover 111 , and the rear end of the motor stator 12 is sealed and connected to the inner side of the first end cover 111 to achieve sealing of the rear end position inside the motor 1 . The injection hole 14 is provided on the first end cover 111 .

[0047] As a preferred embodiment, a plurality of convex ribs 121 are axially arranged on the outer circumference of the motor stator 12, and the plurality of convex ribs 121 are fixedly connected to the inner circumference of the motor housing 11 to enhance the structural strength of the assembly of the two. The plurality of convex ribs 121 are evenly spaced in the circumferential direction to divide the injection channel 13 into a plurality of channels; accordingly, the first end cover 111 is provided with a plurality of injection holes 14 corresponding to the plurality of channels, and the injection pipe 6 is connected to the plurality of injection holes 14.

[0048] See also Figure 4 and Figure 5 The motor 1 further includes a motor rotor 15, which is coaxially rotatable in the motor stator 12. The motor rotor 15 is provided with a rotating shaft 151, and the rear end and the middle of the rotating shaft 151 are rotatably mounted in the motor stator 12 through two bearings 19 respectively, and the front end of the rotating shaft 151 extends out of the motor housing 11 and is fixedly connected to the impeller 2.

[0049] In the present invention, a second end cover 112 is provided at the front end of the motor housing 11 , a through hole 1121 is provided in the middle of the second end cover 112 , the rotating shaft 151 is loosely fitted in the through hole 1121 , and the perfusion channel 13 is connected to the blood outlet 51 through the gap between the rotating shaft 151 and the second end cover 112 .

[0050] It is worth mentioning that in the present invention, a dynamic seal 16 is installed between the front end of the motor stator 12 and the rotating shaft 151 to achieve sealing of the front end position inside the motor 1 .

[0051] Specifically, the dynamic seal 16 includes a sealing shell 161 with a hollow interior and a magnetic fluid 162. In this embodiment, the sealing shell 161 can be a round cake with a certain thickness, and a center hole slightly larger than the diameter of the rotating shaft 151 is provided in the middle thereof. The rear side of the sealing shell 161 is sealed and connected to the front end of the motor stator 12. At the same time, the sealing shell 161 is also sleeved on the rotating shaft 151, and the rotating shaft 151 passes through the center hole on the sealing shell 161 coaxially; the magnetic fluid 162 is accommodated in the sealing shell 161 and wraps the outer peripheral surface of the corresponding part of the rotating shaft 151. By utilizing the characteristics of the magnetic fluid 162, during the rotation of the rotating shaft 151, the magnetic fluid 162 still fills the sealing shell 161 and always wraps the rotating shaft 151, and does not flow out at all. Therefore, blood and perfusion fluid cannot enter the interior of the motor 1 through the gap in the bearing 19 between the rotating shaft 151 and the front end of the motor stator 12, thereby realizing the dynamic sealing function, reducing the waterproof requirements and costs of the motor 1, and increasing the service life of the motor 1.

[0052] In addition, the motor rotor 15 of the present invention is further provided with a rotor magnet 152, which is distributed around the rotating shaft 151 and fixedly connected to the rotating shaft 151. The rotor magnet 152 is used to generate torque under the action of the magnetic field generated when the motor stator 12 is energized, so as to drive the rotating shaft 151 to rotate.

[0053] It is worth mentioning that the rotor magnet 152 in the present invention is composed of a plurality of permanent magnets arranged in a Halbach array and is in a cylindrical shape.

[0054] Specifically, the rotor magnet 152 includes a first magnetic tile and a second magnetic tile, the cross-sections of the first magnetic tile and the second magnetic tile are both fan-shaped, and the number of the first magnetic tile and the second magnetic tile is the same, both 2N, where N is a natural number greater than or equal to 1. Among them, the first magnetic tile is magnetized in the radial direction, that is, its magnetic polarity is distributed on the inner ring and the outer ring; the second magnetic tile is magnetized in the circumferential direction, that is, its magnetic polarity is distributed on both ends along the circumferential direction; at the same time, the magnetic polarity of the end of the second magnetic tile that is in contact with the first magnetic tile is the same as the magnetic polarity of the outer ring of the first magnetic tile. In the circumferential direction, the first magnetic tile and the second magnetic tile are alternately arranged, so as to be spliced ​​into the rotor magnet 152.

[0055] It can be understood that the rotor magnet 152 formed by splicing different numbers of first magnetic tiles and second magnetic tiles has different numbers of magnetic poles, that is, the number of magnetic polarities on its outer circumferential surface, and the rotor magnet 152 can have 2N magnetic poles.

[0056] Figure 7 What is shown is one embodiment of the rotor magnet 152 of the present invention, which includes two first magnetic tiles and two second magnetic tiles. The magnetizing directions of the two first magnetic tiles are opposite, and the magnetizing directions of the two second magnetic tiles are also opposite. The two first magnetic tiles and the two second magnetic tiles are alternately arranged in the circumferential direction and spliced ​​into a rotor magnet 152 with 2 magnetic poles.

[0057] Figure 8 Another embodiment of the rotor magnet 152 of the present invention is shown, which is formed by four first magnetic tiles and four second magnetic tiles alternately arranged and spliced ​​along the circumferential direction. The number of magnetic poles of the rotor magnet 152 is 4.

[0058] Fig. 9 The figure shows another embodiment of the rotor magnet 152 of the present invention, which is formed by six first magnetic tiles and six second magnetic tiles arranged alternately in the circumferential direction. The number of magnetic poles of the rotor magnet 152 is 6.

[0059] Since the rotor magnet 152 in the present invention is composed of multiple permanent magnets arranged in a Halbach array, this structure can greatly enhance the magnetic force on the outside of the motor rotor 15, thereby improving the efficiency of the motor 1. Under the same power requirement, the rotation speed of the motor 1 can be reduced, thereby increasing the service life of the motor 1 and the interventional catheter pump.

[0060] In order to facilitate doctors to implant the interventional catheter pump into the patient's ventricle along the blood vessels, the present invention further provides a guide wire channel 17 between the motor housing 11 and the motor stator 12. Figure 3 As shown, in this embodiment, the wire guide channel 17 can be regarded as a groove axially arranged on one of the ribs 121. At the same time, a wire guide hole 18 connected to the wire guide channel 17 is correspondingly arranged on the first end cover 111 of the motor housing 11.

[0061] It should be noted that the guidewire is an auxiliary component when the interventional catheter pump of the present invention is applied to the heart, and is not within the scope of the present application, so it is not described in detail.

[0062] It is worth mentioning that the perfusion tube 6 is also connected to the guide wire hole 18, so that the guide wire channel 17 can also be used as one of the flow channels of the perfusion liquid, thereby improving the heat dissipation effect and further increasing the flow channel area of ​​the perfusion liquid.

[0063] Before the interventional catheter pump is implanted in the body, the guide wire needs to be inserted into the guide wire hole 18 through the perfusion tube 6, and along the guide wire channel 17 and the blood pumping catheter 3 toward the distal end until it reaches the pigtail tube 7, and then the guide wire is inserted into the left ventricle. After the interventional catheter pump is implanted into the left ventricle along the guide wire, the guide wire is pulled out.

[0064] like Fig.10 As shown, the blood pumping catheter 3 is stuck in the active valve, the blood inlet 41 is in the left ventricle, and the blood outlet 51 is in the aorta. When the interventional catheter pump is working, the blood in the left ventricle is pumped from the blood outlet 51 to the aorta through the blood inlet 41 along the blood pumping catheter 3, thereby realizing the heart assist function and reducing the burden on the heart.

[0065] It can be seen that the interventional catheter pump of the present invention is provided with a perfusion channel 13 between the motor housing 11 and the motor stator 12. The perfusion fluid first enters the perfusion channel 13 through the perfusion hole 14, then flows out of the motor 1, and enters the blood from the blood outlet 51. The flowing perfusion fluid can not only take away the heat generated when the motor 1 rotates at high speed, but also bring the heparin water in the perfusion fluid into the blood, thereby playing an anticoagulant role. Since the perfusion fluid in the present invention flows along the perfusion channel 13 between the motor housing 11 and the motor stator 12, rather than the inside of the motor 1, the waterproof performance requirements of the motor 1 are greatly reduced, the service life of the motor 1 is enhanced, and the area of ​​the perfusion channel 13 is also increased, thereby greatly reducing the perfusion pressure of the perfusion fluid, reducing the bearing pressure of the perfusion system, avoiding the risk of perfusion fluid leakage caused by the perfusion tube 6 being burst by the perfusion fluid pressure, improving the safety of use, and making long-term implantation assistance of the interventional catheter pump possible. Furthermore, the present invention installs a dynamic seal 16 between the motor stator 12 and the rotating shaft 151, and utilizes the characteristics of the magnetic fluid 162, so that during the rotation of the rotating shaft 151, the magnetic fluid 162 still fills the sealing shell 161 and always wraps the rotating shaft 151, so that blood and perfusion fluid cannot enter the interior of the motor 1 through the gap between the rotating shaft 151 and the front end of the motor stator 12, thereby achieving a dynamic sealing function, reducing the waterproof requirements and costs of the motor 1, and increasing the service life of the motor 1. In addition, the rotor magnet 152 in the present invention is composed of multiple permanent magnets arranged in a Halbach array, which can greatly enhance the magnetic force on the outside of the motor rotor 15, improve the efficiency of the motor 1, and reduce the speed of the motor 1 under the same power requirement, further increasing the service life of the motor 1 and the interventional catheter pump.

[0066] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person familiar with the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. An interventional catheter pump, comprising a blood pumping system and a perfusion system, the blood pumping system comprising a motor (1), an impeller (2), a blood pumping catheter (3), and a blood inlet (41) and a blood outlet (51) arranged at both ends of the blood pumping catheter (3), the impeller (2) being mounted on the motor (1), the motor (1) being used to drive the impeller (2) to rotate and perform work, so as to pump blood from the blood inlet (41) into the blood pumping catheter (3) and to cause blood to flow out from the blood outlet (51); The perfusion system comprises a perfusion pipe (6), wherein the perfusion pipe (6) is connected to the motor (1); the motor (1) comprises a motor housing (11), a motor rotor (15), and a motor stator (12) arranged in the motor housing (11), wherein the motor rotor (15) is coaxially rotatable in the motor stator (12), and the motor rotor (15) is provided with a rotating shaft (151), wherein one end of the rotating shaft (151) extends out of the motor housing (11) and is fixedly connected to the impeller (2); Features: The motor housing (11) and the motor stator (12) are both cylindrical with a hollow interior, and the outer diameter of the motor stator (12) is smaller than the inner diameter of the motor housing (11), and a perfusion flow channel (13) is formed in the gap between the inner circumference of the motor housing (11) and the outer circumference of the motor stator (12); A first end cover (111) is provided at one end of the motor housing (11), one end of the motor stator (12) is sealingly connected to the first end cover (111), and a dynamic seal (16) is installed between the other end of the motor stator (12) and the rotating shaft (151); a second end cover (112) is provided at the other end of the motor housing (11), a through hole (1121) is provided on the second end cover (112), and the rotating shaft (151) is loosely fitted in the through hole (1121); The first end cover (111) is provided with a perfusion hole (14) connected to the perfusion channel (13), and the perfusion tube (6) is connected to the blood outlet (51) through the perfusion hole (14) and the perfusion channel (13) in sequence, thereby forming a perfusion passage.

2. The interventional catheter pump according to claim 1, characterized in that: The dynamic seal (16) comprises a sealing shell (161) with a hollow interior and a magnetic fluid (162); the sealing shell (161) is sealingly connected to the other end of the motor stator (12) and is sleeved on the rotating shaft (151); the magnetic fluid (162) is accommodated in the sealing shell (161) and wraps around the outer peripheral surface of the corresponding part of the rotating shaft (151).

3. The interventional catheter pump according to claim 1, characterized in that: The motor rotor (15) is further provided with rotor magnets (152) distributed around the rotating shaft (151), and the rotor magnets (152) are formed by a plurality of permanent magnets arranged in a Halbach array.

4. The interventional catheter pump according to claim 1, characterized in that: A wire guide channel (17) is further provided between the motor housing (11) and the motor stator (12), and a wire guide hole (18) connected to the wire guide channel (17) is further provided at one end of the motor housing (11), and the perfusion tube (6) is connected to the wire guide hole (18).

5. The interventional catheter pump according to claim 1, characterized in that: The distal end of the blood pumping conduit (3) is fixedly connected to an inlet tube (4), the blood inlet (41) is arranged on the inlet tube (4), and a pigtail tube (7) is installed at the distal end of the inlet tube (4); an impeller housing (5) is fixedly connected between the proximal end of the blood pumping conduit (3) and the motor housing (11), the impeller (2) is located in the impeller housing (5), and the blood outlet (51) is arranged on the impeller housing (5).

6. The interventional catheter pump according to claim 1, characterized in that: It also comprises a catheter (8), wherein the catheter (8) is fixedly connected to the motor housing (11), the perfusion tube (6) is arranged in the catheter (8), and a cable (9) for supplying power to the motor (1) is also arranged in the catheter (8).

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