Interventional catheter pump

Abstract

The utility model discloses an interventional catheter pump, include: from near to far connection's catheter, pump body, artificial blood vessel and inlet pipe, be provided with the outlet pipe on the pump body, and the pump body is used for pumping blood from the inlet pipe and flows out from the outlet pipe after artificial blood vessel, the pump body includes the impeller and double motor, and the double motor includes motor shell, the motor shaft that rotates and is installed in the motor shell, and two motor rotors and two motor stators that are fixedly sleeved on the motor shaft on the side, and two motor rotors respectively under the rotating magnetic field of two motor stators generates electromagnetic torque to drive motor shaft to drive the impeller rotation work together. The utility model discloses two motor rotors and two motor stators act on the same motor shaft and constitute double motor to reduce motor loss, increase motor efficiency, under the same blood pumping demand, the power of double motor greatly reduces, effectively reduces motor heating, guarantees patient use safety.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an interventional catheter pump. Background Technology

[0002] As a medical device playing a vital role in the treatment of cardiovascular diseases and other fields, interventional catheter pumps face numerous design challenges. With the advancement of medical technology, the need for miniaturization of interventional catheter pumps is increasingly urgent, enabling more minimally invasive insertion into the human body and reducing trauma to patients. Due to size limitations, the diameters of the motor and impeller must be very small; therefore, to meet the required pumping volume, the motor must achieve higher speeds.

[0003] The problem of motor losses in traditional interventional catheter pumps is becoming increasingly prominent. Due to various energy losses during the electromagnetic conversion process within the motor, these losses are difficult to effectively reduce within a limited space. Higher losses reduce motor efficiency, necessitating increased motor power to achieve the required speed, leading to significant heat generation. Motor overheating is a serious issue for interventional catheter pumps. On one hand, excessive heat affects the motor's performance and lifespan, shortening the device's usability; on the other hand, during intraoperative use, excessively high temperatures can cause thermal damage to surrounding tissues, posing a significant safety risk to the patient. Therefore, it is necessary to improve existing technology to overcome its shortcomings. Utility Model Content

[0004] The problem to be solved by this utility model is to provide an interventional catheter pump to overcome the defects of existing interventional catheter pumps, which suffer from high motor losses, low efficiency, and severe heat generation, thus reducing patient safety.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an interventional catheter pump, comprising: a catheter, a pump body, an artificial blood vessel, and an inlet tube connected sequentially from proximal to distal; the pump body is provided with an outlet tube; the pump body is used to pump blood from the inlet tube into the artificial blood vessel and out through the outlet tube; the pump body includes an impeller and two motors; the two motors include a motor housing, a motor shaft rotatably mounted in the motor housing, two motor rotors fixedly mounted side by side on the motor shaft, and two motor stators for corresponding and cooperating with the two motor rotors; the two motor rotors generate electromagnetic torque under the action of the rotating magnetic field generated by the two motor stators, so as to jointly drive the motor shaft to drive the impeller to rotate and do work.

[0006] As a further improvement of this utility model, the pump body also includes a pump housing, the dual motors are fixed inside the pump housing, the outlet pipe is fixedly connected to the far end of the pump housing, and the impeller is built into the outlet pipe.

[0007] As a further improvement of this utility model, a filling channel is provided between the pump housing and the motor housing.

[0008] As a further improvement of this utility model, a filling inlet is provided at the near end of the pump housing, and a gap between the far end of the pump housing and the motor shaft is provided as a filling outlet. The conduit, the filling inlet, the filling channel, the filling outlet and the outlet pipe are connected in sequence.

[0009] As a further improvement of this utility model, a magnetohydrodynamic sealing device is installed between the far end of the motor housing and the motor shaft.

[0010] As a further improvement of this utility model, the two motor rotors and the two motor stators are spaced apart, and a permanent magnet bearing is installed in the spaced area between the two motor rotors and the two motor stators. The permanent magnet bearing includes a first magnetic ring and a second magnetic ring. The first magnetic ring is fixed to the motor housing, and the second magnetic ring is fixed to the motor shaft and located in the middle of the first magnetic ring. The first magnetic ring has a radial repulsive force on the second magnetic ring.

[0011] As a further improvement of this utility model, the number of the first magnetic ring and the second magnetic ring is the same and there are multiple of each. The first magnetic ring and the second magnetic ring are both magnetized along the axial direction. The magnetic poles of the first magnetic ring and the second magnetic ring, which are relatively distributed in the radial direction, have the same direction. Two adjacent first magnetic rings and two adjacent second magnetic rings are fixedly spliced ​​together with the same magnetic pole surfaces.

[0012] As a further improvement of this utility model, magnetic shielding positioning plates are provided on both sides of the permanent magnet bearing.

[0013] As a further improvement of this utility model, the conduit is made of polyurethane or silicone material and is hollow inside for the flow of perfusion fluid. At the same time, the cables of the dual motors are passed through the conduit.

[0014] As a further improvement of this utility model, a pig tail tube is installed at the distal end of the inlet pipe.

[0015] The beneficial effects of this utility model are as follows: This utility model provides an interventional catheter pump. Under the constraint of a small size, it uses two motor rotors and two motor stators acting together on the same motor shaft to form a dual motor. This structure can better optimize the electromagnetic conversion process inside the dual motors, effectively reduce the losses of the dual motors, and thus greatly increase the efficiency of the dual motors. Therefore, under the same pumping blood volume requirement, the power of the dual motors is greatly reduced, which can effectively reduce the problem of motor overheating and ensure patient safety. At the same time, by setting an infusion channel between the motor housing and the pump housing, the flowing infusion fluid injected into the infusion channel can carry away the heat generated by the high-speed rotation of the dual motors, greatly reducing the risk of thermal damage to surrounding tissues. Furthermore, the infusion fluid only flows through the outside of the dual motors, which can reduce the waterproof performance requirements of the dual motors and increase the service life of the interventional catheter pump. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of the interventional catheter pump of this utility model;

[0018] Figure 2 This is a perspective view of the pump body in the interventional catheter pump of this utility model;

[0019] Figure 3 This is a cross-sectional view of the pump body in the interventional tubing pump of this utility model;

[0020] Figure 4 A perspective view of the pump body of the interventional tubular pump of this utility model after removing the pump housing;

[0021] Figure 5 This is a cross-sectional view of the motor shaft and permanent magnet bearing in the interventional duct pump of this utility model.

[0022] Referring to the accompanying drawings, the following explanations are provided:

[0023] 1. Conduit; 2. Pump body; 21. Outlet pipe; 22. Impeller; 23. Dual motors;

[0024] 231. Motor shaft; 232. Motor rotor; 233. Motor stator; 234. Motor housing; 235. Permanent magnet bearing; 2351. First magnetic ring; 2352. Second magnetic ring; 236. Magnetic shielding positioning plate; 237. Ball bearing; 24. Pump housing; 241. Infusion channel; 242. Infusion inlet; 243. Infusion outlet; 25. Magnetohydrodynamic sealing device; 3. Artificial blood vessel; 4. Inlet pipe; 5. Pig tail tube. Detailed Implementation

[0025] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0028] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0029] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0030] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0031] See Figures 1 to 5 This utility model provides an interventional catheter pump, including: a catheter 1, a pump body 2, an artificial blood vessel 3 and an inlet tube 4, and an outlet tube 21 is provided on the pump body 2.

[0032] For ease of understanding, the end of the interventional catheter pump that is closer to the operator or the starting point of the external device is defined as the proximal end, and the other end that is farther from the operator or implanted inside the human body is defined as the distal end.

[0033] The catheter 1, pump body 2, artificial blood vessel 3, and inlet tube 4 are connected sequentially from proximal to distal. The outlet tube 21 on the pump body 2 is connected to the proximal end of the artificial blood vessel 3. During use, the artificial blood vessel 3 penetrates the aortic valve, the inlet tube 4 extends into the left ventricle, and the outlet tube 21 is located in the aorta. When the pump body 2 is working, it pumps blood from the left ventricle into the aorta through the inlet tube 4, through the artificial blood vessel 3, and out through the outlet tube 21 into the aorta, thereby achieving cardiac assist function and reducing the burden on the heart.

[0034] Furthermore, the pump body 2 includes an impeller 22 and dual motors 23. The dual motors 23 include a motor housing 234, a motor shaft 231 rotatably mounted within the motor housing 234, two motor rotors 232 fixedly mounted side-by-side on the motor shaft 231, and two motor stators 233 for correspondingly engaging with the two motor rotors 232. The two motor stators 233 are fixed side-by-side and coaxially to the inner wall of the motor housing 234, with the two motor rotors 232 located at the center of each of the two motor stators 233. Under the influence of the rotating magnetic field generated by the two motor stators 233, the two motor rotors 232 generate electromagnetic torque, which together drive the motor shaft 231 to rotate and perform work on the impeller 22.

[0035] This utility model of interventional catheter pump, under the constraint of small size, uses two motor rotors 232 and two motor stators 233 acting together on the same motor shaft 231 to form a dual motor 23. This structure can better optimize the electromagnetic conversion process inside the dual motor 23, effectively reduce the loss of the dual motor 23, and thus greatly increase the efficiency of the dual motor 23. Therefore, under the same blood pumping volume requirement, the power of the dual motor 23 is greatly reduced, which can effectively reduce the problem of motor heat generation and ensure patient safety.

[0036] When a conventional single motor operates under high load, the concentrated heat generated causes the motor temperature to rise rapidly, leading to decreased motor performance, increased resistance, and increased energy loss. Simultaneously, the single rotor bearing the entire load and operating under high load for extended periods can cause premature wear of motor components. This novel traction pump employs a dual-motor (23) structure, where the load is shared by two motor rotors (232). The load on each motor rotor (232) is relatively reduced, which not only lowers the heat generation of a single rotor (232) but also improves heat dissipation due to the larger heat dissipation area of ​​the two rotors (232). This effectively maintains the motor's operating temperature at a lower level, reducing increased resistance and energy loss caused by temperature rise. Furthermore, the balanced load results in more even wear on the components of the column motor, extending the overall service life of the motor and maintaining high efficiency during long-term operation.

[0037] like Figure 2 and Figure 3 As shown, the pump body 2 also includes a pump housing 24, a dual motor 23 fixed inside the pump housing 24, an outlet pipe 21 fixedly connected to the far end of the pump housing 24, and an impeller 22 built into the outlet pipe 21.

[0038] It is worth mentioning that a filling channel 241 is provided between the pump housing 24 and the motor housing 234.

[0039] Specifically, see Figure 3 and Figure 4 In this embodiment, both the pump housing 24 and the motor housing 234 are hollow cylinders. Multiple ribs are provided along the axial direction on the outer peripheral surface of the motor housing 234. The multiple ribs are fixedly connected to the inner peripheral surface of the pump housing 24. The injection channel 241 is formed by the gaps between the ribs.

[0040] Furthermore, a first cover and a second cover are respectively provided at the near end and the far end of the pump housing 24. The near end of the motor housing 234 is sealed to the first cover, and the first cover has a filling port 242 leading to the filling channel 241 near its outer edge. The second cover at the far end of the pump housing 24 is clearance-fitted to the motor shaft 231, and the gap between them is set as the filling outlet 243. The conduit 1, the filling port 242, the filling channel 241, the filling outlet 243, and the outlet pipe 21 are connected in sequence.

[0041] This invention allows perfusion fluid to be injected into the pump body 2 via the conduit 1. The perfusion fluid enters the perfusion channel 241 between the motor housing 234 and the pump housing 24 through the perfusion inlet 242, and then flows through the perfusion outlet 243 to the outlet pipe 21 and into the blood. The flowing perfusion fluid can not only remove the heat generated when the dual motors 23 rotate at high speed, but also carry the heparin water in the perfusion fluid into the blood, thus playing an anticoagulant role.

[0042] In addition, a magnetic fluid sealing device 25 is installed between the distal end of the motor housing 234 and the motor shaft 231. The magnetic fluid sealing device 25 includes a magnetic fluid housing and magnetic fluid contained inside the magnetic fluid housing. The magnetic fluid housing is fixed to the distal end face of the motor housing 234, and a through hole is opened in the middle of the magnetic fluid housing. The motor shaft 231 passes through the through hole. Utilizing the properties of the magnetic fluid, the magnetic fluid always surrounds the motor shaft 231 when the motor shaft 231 rotates, thereby achieving a dynamic seal between the motor housing 234 and the motor shaft 231.

[0043] Since the near end of the motor housing 234 is sealed to the first cover, and a magnetic fluid sealing device 25 is installed between the far end of the motor housing 234 and the motor shaft 231, the injection fluid only flows from the outside of the dual motors 23 and will not enter the interior of the dual motors 23. This can reduce the waterproof performance requirements of the dual motors 23 and increase the service life of the dual motors 23.

[0044] See Figure 3 and Figure 5 In this utility model, the two motor rotors 232 and the two motor stators 233 are spaced apart, and permanent magnet bearings 235 are installed in the spaced areas between the two motor rotors 232 and the two motor stators 233.

[0045] The permanent magnet bearing 235 includes a first magnetic ring 2351 and a second magnetic ring 2352. The first magnetic ring 2351 is fixedly installed on the inner wall of the motor housing 234, and the second magnetic ring 2352 is fixedly fitted onto the motor shaft 231 and located in the middle of the first magnetic ring 2351. The first magnetic ring 2351 and the second magnetic ring 2352 do not contact each other. The first magnetic ring 2351 has a radial repulsive force on the second magnetic ring 2352. This radial repulsive force can support the motor shaft 231, making the motor shaft 231 more stable during rotation and reducing the vibration and noise of the dual motors 23 during operation.

[0046] The first magnetic ring 2351 and the second magnetic ring 2352 are the same in number and there are multiple of each. The first magnetic ring 2351 and the second magnetic ring 2352 are both magnetized along the axial direction. The first magnetic ring 2351 and the second magnetic ring 2352, which are relatively distributed in the radial direction, have the same magnetic pole direction. Two adjacent first magnetic rings 2351 and two adjacent second magnetic rings 2352 are fixedly spliced ​​together with the same magnetic pole surface.

[0047] like Figure 5 As shown, in this embodiment, the number of first magnetic rings 2351 and second magnetic rings 2352 is set to two, and the thickness of the first magnetic rings 2351 and the second magnetic rings 2352 is the same. The surfaces where the two first magnetic rings 2351 are joined together are both S-pole, and the surfaces where the two second magnetic rings 2352 are joined together are also both S-pole. Of course, all magnetic pole directions can be interchanged.

[0048] This utility model adopts this permanent magnet bearing 235 structure, which can concentrate the magnetic lines of force in the middle of the permanent magnet bearing 235, making the permanent magnet bearing 235 have a stronger constraint force on the motor shaft 231 and higher stability.

[0049] Of course, in other embodiments of this utility model, the number of the first magnetic ring 2351 and the second magnetic ring 2352 can also be set to three or more.

[0050] It is worth mentioning that magnetic shielding positioning plates 236 are provided on both sides of the permanent magnet bearing 235. The magnetic shielding positioning plates 236 are annular, and the outer peripheral wall of the magnetic shielding positioning plates 236 is fixed to the inner wall of the motor housing 234. The inner peripheral wall of the magnetic shielding positioning plates 236 is clearance-fitted with the motor shaft 231.

[0051] Among them, the magnetic shielding positioning plates 236 are all made of magnetic shielding materials, such as graphene and aluminum cobalt nickel.

[0052] This invention provides magnetic shielding positioning plates 236 made of magnetic shielding material on both sides of the permanent magnet bearing 235. These plates not only limit the second magnetic ring 2352 and prevent it from shifting axially due to repulsive force, but also shield the magnetic field of the permanent magnet bearing 235, preventing it from interfering with the motor rotor 232.

[0053] In addition, ball bearings 237 can be installed between the two ends of the motor housing 234 and the motor shaft 231, which can further improve the stability of the rotation of the motor shaft 231.

[0054] The conduit 1 in this invention is made of polyurethane or silicone material and is hollow inside for the flow of perfusion fluid. At the same time, the cables of the dual motors 23 are passed through the conduit 1.

[0055] Furthermore, the interventional catheter pump of this invention also includes a pigtail tube 5, which is connected to the distal end of the inlet tube 4. The pigtail tube 5 can reduce scratching damage to the inner wall of the blood vessel and corresponding tissues during the implantation of the interventional catheter pump, reduce the risk of complications, and at the same time help maintain a specific position in the ventricle, making it less prone to movement and ensuring the stable operation of the interventional catheter pump.

[0056] It should also be noted that in the interventional duct pump involved in this utility model, the motor rotor 232 and the motor stator 233 both adopt existing mature conventional technical solutions. This utility model does not involve any improvement on the structure and principle of the motor rotor 232 and the motor stator 233, and the specific structure and working principle of the motor rotor 232 and the motor stator 233 will not be described in detail here.

[0057] Therefore, this utility model of interventional catheter pump, under the constraint of a small size, uses two motor rotors 232 and two motor stators 233 acting together on the same motor shaft 231 to form a dual motor 23. This structure can better optimize the electromagnetic conversion process inside the dual motor 23, effectively reduce the loss of the dual motor 23, and thus greatly increase the efficiency of the dual motor 23. Therefore, under the same blood pumping volume requirement, the power of the dual motor 23 is greatly reduced, which can effectively reduce the problem of motor overheating and ensure patient safety. At the same time, by setting an infusion channel 241 between the motor housing 234 and the pump housing 24, the flowing infusion fluid injected into the infusion channel 241 can carry away the heat generated when the dual motor 23 rotates at high speed, which greatly reduces the risk of thermal damage to surrounding tissues. Moreover, the infusion fluid only flows through the outside of the dual motor 23, which can reduce the waterproof performance requirements of the dual motor 23 and increase the service life of the interventional catheter pump.

[0058] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0059] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An interventional catheter pump, comprising a catheter (1), a pump body (2), an artificial blood vessel (3), and an inlet tube (4) connected sequentially from proximal to distal, wherein the pump body (2) is provided with an outlet tube (21), and the pump body (2) is used to pump blood from the inlet tube (4) into the artificial blood vessel (3) and out through the outlet tube (21); characterized in that: The pump body (2) includes an impeller (22) and a dual motor (23). The dual motor (23) includes a motor housing (234), a motor shaft (231) rotatably mounted in the motor housing (234), two motor rotors (232) fixedly mounted side by side on the motor shaft (231), and two motor stators (233) for correspondingly cooperating with the two motor rotors (232). The two motor rotors (232) generate electromagnetic torque under the action of the rotating magnetic field generated by the two motor stators (233), so as to jointly drive the motor shaft (231) to drive the impeller (22) to rotate and do work.

2. The interventional catheter pump according to claim 1, characterized in that: The pump body (2) also includes a pump housing (24), the dual motors (23) are fixed inside the pump housing (24), the outlet pipe (21) is fixedly connected to the far end of the pump housing (24), and the impeller (22) is built into the outlet pipe (21).

3. The interventional catheter pump according to claim 2, characterized in that: A filling channel (241) is provided between the pump housing (24) and the motor housing (234).

4. The interventional catheter pump according to claim 3, characterized in that: The pump housing (24) has a filling port (242) at its near end, and the gap between the far end of the pump housing (24) and the motor shaft (231) is set as a filling outlet (243). The conduit (1), the filling port (242), the filling channel (241), the filling outlet (243) and the outlet pipe (21) are connected in sequence.

5. The interventional catheter pump according to claim 3, characterized in that: A magnetohydrodynamic sealing device (25) is installed between the far end of the motor housing (234) and the motor shaft (231).

6. The interventional catheter pump according to claim 1, characterized in that: The two motor rotors (232) and the two motor stators (233) are spaced apart, and a permanent magnet bearing (235) is installed in the spaced area between the two motor rotors (232) and the two motor stators (233). The permanent magnet bearing (235) includes a first magnetic ring (2351) and a second magnetic ring (2352). The first magnetic ring (2351) is fixed to the motor housing (234), and the second magnetic ring (2352) is fixed to the motor shaft (231) and is located in the middle of the first magnetic ring (2351). The first magnetic ring (2351) has a radial repulsive force on the second magnetic ring (2352).

7. The interventional catheter pump according to claim 6, characterized in that: The number of the first magnetic ring (2351) and the second magnetic ring (2352) is the same and there are multiple of each. The first magnetic ring (2351) and the second magnetic ring (2352) are both magnetized along the axial direction. The first magnetic ring (2351) and the second magnetic ring (2352) that are radially opposite to each other have the same magnetic pole direction. Two adjacent first magnetic rings (2351) and two adjacent second magnetic rings (2352) are fixedly spliced ​​together with the same magnetic pole surfaces.

8. The interventional catheter pump according to claim 6, characterized in that: The permanent magnet bearing (235) is provided with magnetic shielding positioning plates (236) on both sides.

9. The interventional catheter pump according to claim 3, characterized in that: The catheter (1) is made of polyurethane or silicone material and is hollow inside for the flow of perfusion fluid. At the same time, the cables of the dual motors (23) are passed through the catheter (1).

10. The interventional catheter pump according to claim 1, characterized in that: A pig tail tube (5) is installed at the distal end of the inlet pipe (4).

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