Efficient and easy-to-recycle interventional catheter pump

Abstract

The invention discloses an efficient easy-recovery interventional catheter pump which comprises a blood pumping pipeline, a motor, an impeller, a support cage and a recovery pipe, the blood pumping pipeline is provided with an inlet pipe and an outlet pipe, and the motor is used for driving the impeller to rotate so that blood can be pumped into the blood pumping pipeline from the inlet pipe and flows out from the outlet pipe; the support cage is connected between the blood pumping pipeline and the motor, the support cage comprises a plurality of elastic support cage wires which are uniformly arranged and distributed at intervals in the circumferential direction, and the support cage wires are obliquely distributed relative to the central axis of the support cage; the impeller is arranged in the support cage and provided with a plurality of blades with elastic deformation capacity. The inner wall of the far end of the recycling pipe is evenly provided with recycling rails in one-to-one correspondence with the supporting cage wires in the circumferential direction at intervals, and the recycling pipe is used for being arranged on the support cage in a penetrating and sleeving mode so that the impeller and the support cage can be switched from the natural state to the recycling state. The impeller unfolding space and the effective acting area of the blades can be maximized, the blood pumping efficiency is improved, and the recycling operation difficulty is reduced.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a high-efficiency, easily retrievable interventional catheter pump. Background Technology

[0002] Acute heart failure is a critical and severe condition in the cardiovascular field, caused by a sudden drop in myocardial contractility leading to a sharp decrease in cardiac output and pulmonary congestion, requiring rapid circulatory support. Interventional catheter pumps, as minimally invasive mechanical circulatory support devices, can directly assist in pumping blood after being inserted into the heart via a blood vessel, buying time for the patient's treatment.

[0003] Existing interventional catheter pumps are generally divided into two types: in vivo driven and extracorporeal driven. Extracorporeal driven pumps work by connecting an external motor to the internal impeller shaft via a thin, flexible shaft. The motor transmits torque to the impeller through the flexible shaft, causing it to rotate and thus pumping blood. However, due to the limitations of the flexible shaft, the torque transmission efficiency is very low, and the friction between the flexible shaft and the catheter is high, easily leading to overheating and hemolysis. Therefore, their usability is inferior to those with in vivo motors. In vivo driven pumps integrate a micro-motor within the catheter pump, allowing direct insertion into the heart. Power is supplied via an external lead, and the motor drives the impeller to rotate, thus pumping blood. However, due to size limitations, the diameter of the in vivo driven motor generally cannot exceed 6mm, and the effective working area of ​​the impeller is significantly reduced. Therefore, to reduce the burden on the patient's heart and achieve a pumping volume of 2.5~5L / min, the impeller needs to operate at tens of thousands of revolutions per minute. High speeds not only exacerbate mechanical wear but also cause severe hemolysis due to excessive fluid shear force. Furthermore, the heat generated by high-speed rotation cannot be dissipated in time, further damaging blood components. Therefore, it is necessary to improve existing technologies to overcome their shortcomings. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a high-efficiency and easily recoverable interventional catheter pump to overcome the shortcomings of low blood pumping efficiency of existing interventional catheter pumps.

[0005] The technical solution adopted by this invention to solve its technical problem is: a high-efficiency, easily recoverable interventional catheter pump, including a pumping vessel circuit, a motor, and an impeller. The pumping vessel circuit is provided with an inlet pipe and an outlet pipe. The motor drives the impeller to rotate and perform work, so as to pump blood from the inlet pipe into the pumping vessel circuit and out through the outlet pipe. The interventional catheter pump further includes: A support cage is connected between the pump line and the motor. The support cage includes multiple support cage wires that are evenly spaced around the periphery and have elastic deformation capability. Each of the support cage wires is inclined relative to the central axis of the support cage. The impeller is disposed inside the support cage and has multiple blades with elastic deformation capability. The device includes a recovery tube, whose distal inner wall is provided with recovery tracks at uniform intervals along the circumference, the same number of which correspond to the number of the support cage wires. The recovery tube is used to be fitted onto the support cage so that the impeller and the support cage can be switched from the natural state to the recovery state. In its natural state, each of the supporting cage wires is C-shaped, so that the overall support cage presents a circular cage shape with the outer diameter gradually decreasing from the middle to both ends. At the same time, the blades are stretched out under their own elastic force and do not contact the supporting cage wires. In the retracted state, each of the supporting cage wires extends axially under the restraint of the retracting tube and is distributed along the corresponding retracting track. At the same time, the blades are compressed by the supporting cage wires and undergo elastic deformation to shrink.

[0006] As a further improvement of the present invention, in the natural state, the angle formed by the plane where each of the supporting cage wires is located and the central axis of the support cage is θ, and the value of θ is in the range of 15°~30°.

[0007] As a further improvement of the present invention, each of the recovery tracks is inclined along the inner wall of the recovery tube.

[0008] As a further improvement of the present invention, the support cage further includes two support rings, and the two ends of each support cage wire are respectively fixedly connected to the two support rings, wherein one support ring is fixedly connected to the outlet pipe and the other support ring is fixedly connected to the motor.

[0009] As a further improvement of the present invention, all blades are spiral-shaped, and multiple blades are centrally symmetrically distributed.

[0010] As a further improvement of the present invention, the surface of the support cage is covered with a protective layer, and both the surface of the protective layer and the surface of the recycling tube are coated with a hydrophilic coating.

[0011] As a further improvement of the present invention, the motor includes an inner tube, a stator, and a rotor. The stator is fixed to the inner wall of the inner tube, and the rotor is coaxially rotatably disposed inside the stator. The rotor includes a motor shaft, the distal end of which passes through the inner tube and is fixedly connected to the impeller. At the same time, the distal and proximal ends of the motor shaft are rotatably connected to the inner tube via a dynamic sealing mechanism and a bearing, respectively.

[0012] As a further improvement of the present invention, the dynamic sealing mechanism includes a dynamic sealing housing and a graphite packing. The dynamic sealing housing is fixed to the far end of the inner tube of the motor, the graphite packing is disposed inside the dynamic sealing housing, and the motor shaft passes through the middle of the dynamic sealing housing and is in close contact with the graphite packing.

[0013] As a further improvement of the present invention, the motor further includes a motor housing, which is fixedly fitted onto the inner tube of the motor. A sealing cover is provided at the proximal end of the motor housing, and the sealing cover is sealed to the proximal end of the inner tube of the motor. An infusion channel is provided between the motor housing and the inner tube of the motor. The interventional catheter pump further includes a catheter, which is fixedly connected to the proximal end of the motor housing and communicates with the infusion channel. At the same time, the infusion channel leads to the outside of the motor through the gap between the motor housing and the motor shaft.

[0014] As a further improvement of the present invention, the interventional catheter pump also includes a sensor and a cable passing through the catheter. A sensor channel is also provided between the motor housing and the motor inner tube. The sensor passes through the sensor channel and exposes its probe outside the motor housing for monitoring blood pressure and flow. A connector is provided on the cable. The connector is sealed to the sealing cover plate, and the cable passes through the sealing cover plate and is electrically connected to the rotor.

[0015] The beneficial effects of this invention are as follows: This invention provides a highly efficient and easily retrievable interventional catheter pump. By designing elastically deformable support cage wires and blades, and cooperating with a retrieval tube with a retrieval track, an interventional catheter pump that can naturally extend and be directionally retrieved is formed. In its natural state, the support cage wires are C-shaped, making the stent cage form a circular cage structure with a large diameter in the middle and small diameters at both ends. This maximizes the impeller's expansion space and the effective working area of ​​the blades. Under the premise of meeting a certain pumping blood volume requirement, the impeller's operating speed can be significantly reduced, reducing the risk of hemolysis caused by fluid shear force. At the same time, the blades and support cage wires do not contact each other, avoiding mechanical interference during operation, optimizing flow field stability, and improving pumping efficiency. In the retrieval state, the retrieval track of the retrieval tube corresponds one-to-one with the support cage wires, providing a directional contraction path for the support cage wires. This allows the stent cage to smoothly extend and contract axially along the retrieval track, avoiding problems such as jamming during retrieval, reducing the difficulty of retrieval operation and the risk of damage to the vascular endothelium. At the same time, the blades elastically contract synchronously with the support cage wires, adapting to the size requirements of minimally invasive interventions and improving operational safety. 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 three-dimensional view of the high-efficiency and easily recyclable interventional catheter pump of the present invention in its natural state; Figure 2This is a perspective view of the motor, impeller, and support cage in the high-efficiency, easily recyclable duct pump of the present invention in their natural state. Figure 3 This is a perspective view of the motor, impeller, and support cage in the efficient and easily recyclable duct pump of the present invention in the recycling state. Figure 4 This is a perspective view of the recovery tube in the high-efficiency and easily recoverable interventional catheter pump of the present invention; Figure 5 This is a perspective view of the motor and impeller in the high-efficiency, easily recyclable duct pump of the present invention; Figure 6 This is a cross-sectional view of the motor in the high-efficiency, easily recyclable duct pump of the present invention.

[0018] Referring to the accompanying drawings, the following explanations are provided: 1. Pump circuit; 101. Inlet pipe; 102. Outlet pipe; 2. Motor; 201. Inner tube of motor; 202. Stator; 203. Rotor; 2031. Motor shaft; 204. Dynamic seal housing; 205. Graphite packing; 206. Bearing; 207. Motor housing; 2071. Sealing cover plate; 208. Injection channel; 3. Impeller; 301. Blade; 4. Support cage; 401. Support cage wire; 402. Support ring; 5. Recovery pipe; 501. Recovery track; 6. Conduit; 7. Sensor; 8. Connector; 9. Pig tail pipe. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0024] See Figures 1 to 6 The present invention provides a high-efficiency and easily retrievable interventional catheter pump, including a pumping line 1, a motor 2, an impeller 3, a stent cage 4, and a retrieval tube 5.

[0025] like Figure 1 As shown, 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 away from the operator or implanted inside the human body is defined as the distal end.

[0026] The pumping vessel circuit 1 has an inlet tube 101 at its distal end and an outlet tube 102 at its proximal end. This invention's efficient and easily retrievable interventional catheter pump, after intervention in the human heart, allows the pumping vessel circuit 1 to penetrate the aortic valve, with the inlet tube 101 extending into the left ventricle and the outlet tube 102 located in the aorta. A motor 2 drives an impeller 3 to rotate, pumping blood from the left ventricle from the inlet tube 101 into the pumping vessel circuit 1, and then out through the outlet tube 102 to the aorta, thereby achieving cardiac assist function and reducing the burden on the patient's heart.

[0027] Furthermore, the stent cage 4 is connected between the pump line 1 and the motor 2. The stent cage 4 includes multiple support cage wires 401, which are evenly spaced along the circumference of the stent cage 4. At the same time, each support cage wire 401 is inclined in the same direction relative to the central axis of the stent cage 4. Each support cage wire 401 has elastic deformation capability.

[0028] Furthermore, the impeller 3 is located inside the support cage 4, and the impeller 3 has multiple blades 301, which are surrounded by multiple support cage wires 401. Each blade 301 also has elastic deformation capability.

[0029] In this invention, the recovery pipe 5 is used to be fitted onto the support cage 4 so that the impeller 3 and the support cage 4 can be switched from the natural state to the recovery state; and the recovery pipe 5 can be removed from the interventional conduit pump so that the impeller 3 and the support cage 4 can be switched from the recovery state back to the natural state.

[0030] Specifically, before intervention, the retrieval tube 5 is fitted onto the stent cage 4, providing a certain degree of restraint and keeping the stent cage 4 in a retractable state, facilitating its insertion into the heart along the blood vessel. After the interventional catheter pump reaches the predetermined position in the heart, the retrieval tube 5 is withdrawn. The impeller 3 and stent cage 4 unfold under their own rebound force, and then the motor 2 starts running, driving the impeller 3 to rotate and perform work to pump blood. When the patient's heart recovers and it is necessary to withdraw the interventional catheter pump, the retrieval tube 5 is inserted into the heart via interventional means, the impeller 3 and stent cage 4 are pulled into the retrieval tube 5, and the impeller 3 and stent cage 4 retract, and then are withdrawn from the patient's body along with the retrieval tube 5.

[0031] The inner wall of the far end of the recycling pipe 5 is provided with recycling tracks 501 at uniform intervals along the circumference, which are the same number as the number of support cage wires 401 and correspond one-to-one. During the recycling process, the support cage 4 can be retracted into the recycling pipe 5 along the recycling tracks 501 inside the recycling pipe 5 and become a recycling form.

[0032] like Figure 2 As shown, in its natural state, each support cage wire 401 is C-shaped, so that the support cage 4 as a whole presents a circular cage shape with the outer diameter gradually decreasing from the middle to both ends. At the same time, the blades 301 are stretched out under their own elastic force and do not contact each other with the support cage wire 401.

[0033] like Figure 3 As shown (for ease of understanding, Figure 3 (The recovery tube 5 is not shown in the image). In the recovery state, each support cage wire 401 extends axially under the constraint of the recovery tube 5 and is distributed along the corresponding recovery track 501. At the same time, the blade 301 is compressed by the support cage wire 401 and undergoes elastic deformation to shrink.

[0034] This invention designs elastically deformable support cage wire 401 and blades 301, and uses a recovery pipe 5 with a recovery track 501 to form an interventional catheter pump that can naturally expand and be directionally recovered. In its natural state, the support cage wire 401 is C-shaped, making the support cage 4 a circular cage structure with a large diameter in the middle and small diameters at both ends. This maximizes the expansion space of the impeller 3 and the effective working area of ​​the blades 301. Under the premise of meeting a certain blood pumping volume requirement, the operating speed of the impeller 3 can be significantly reduced, reducing the risk of hemolysis caused by fluid shear force. At the same time, the blades 301 and the support cage wire 401 do not contact each other, avoiding mechanical interference during operation, optimizing flow field stability, and improving blood pumping efficiency. In the retrieval state, the retrieval track 501 of the retrieval tube 5 corresponds one-to-one with the support cage wire 401, providing a directional contraction path for the support cage wire 401. This allows the stent cage 4 to smoothly extend and contract along the retrieval track 501, avoiding problems such as jamming during retrieval and reducing the difficulty of the retrieval operation and the risk of damage to the vascular endothelium. At the same time, the blade 301 elastically contracts synchronously with the support cage wire 401, adapting to the size requirements of minimally invasive intervention and improving the safety of the operation.

[0035] Alternatively, both the impeller 3 and the support cage 4 can be made of titanium alloy or cobalt-chromium alloy with memory function.

[0036] Preferably, in its natural state, the plane containing each support cage wire 401 forms an angle θ with the central axis of the support cage 4, and the value of θ ranges from 15° to 30°. This tilt angle can reduce the axial deformation stress of the support cage wire 401 during the process of shrinking into the recovery pipe 5, so that the support cage 4 shrinks in a rotating forward manner, making the recovery process smoother and improving the recovery reliability of the support cage 4.

[0037] See Figure 4 Each recovery track 501 is inclined along the inner wall of the recovery pipe 5.

[0038] When the interventional catheter pump needs to be removed from the body, the retrieval tube 5 is inserted into the heart via the interventional method along the catheter pump. The catheter pump is then pulled outward to pull the impeller 3 and the stent cage 4 into the retrieval tube 5. During this process, the support cage wire 401 retracts into the retrieval tube 5 along the corresponding retrieval track 501. Since both the support cage wire 401 and the retrieval track 501 are inclined, under the precise guidance of the retrieval track 501, the stent cage 4 retracts in a spiral manner that extends axially while rotating. At the same time, the blade 301 is compressed by the support cage wire 401 and undergoes elastic deformation, resulting in a folded retraction. This makes the retrieval of the stent cage 4 and the impeller 3 more convenient and can significantly reduce the frictional resistance between the support cage wire 401 and the retrieval tube 5, avoiding plastic deformation of the support cage wire 401 caused by forced compression. This ensures the smoothness of the retrieval process and the reliability of the stent cage 4 for reuse, and shortens the operation time.

[0039] See Figure 1 and Figure 2 The support cage 4 also includes two support rings 402, with both ends of each support cage wire 401 fixedly connected to the two support rings 402. One support ring 402 is fixedly connected to the outlet pipe 102, and the other support ring 402 is fixedly connected to the motor housing 207 of the motor 2. The support cage 4 in this invention consists of only multiple support cage wires 401 and two support rings 402, resulting in a simple and compact structure. This simplifies the production and assembly process, reduces production difficulty, and simultaneously reduces the amount of raw materials used and processing time, significantly lowering the overall production cost.

[0040] See Figure 5 The impeller 3 is fixedly connected to the motor shaft 2031 of the motor 2. The impeller 3 has two blades 301, both of which are helical in shape and are centrally symmetrically distributed. In this embodiment, the helical direction of the blades 301 is approximately the same as the inclination direction of the support cage wire 401. By using helical blades 301, this invention can adapt to the elastic contraction height of the support cage 4. The helical surface of the blades 301 can naturally fold along the radial pressure direction when the support cage 4 contracts, and can also rebound synchronously with the expansion of the support cage 4 when it unfolds, making the overall contraction and expansion process smoother and more efficient. At the same time, the helical blades 301 can generate a continuous axial thrust on the blood, forming a stable helical flow field, improving the energy transfer efficiency between the blades 301 and the blood, and achieving a higher blood pumping volume.

[0041] It is worth mentioning that the surface of the stent cage 4 is covered with a protective layer, which can be made of polyurethane or polytetrafluoroethylene. The protective layer has strong elasticity and toughness, preventing the stent cage 4 from breaking during the contraction and expansion process. In addition, the surface of the protective layer is coated with a hydrophilic coating. After contacting blood, the hydrophilic coating forms a smooth hydrogel layer, which significantly reduces the coefficient of friction between the stent cage 4 and the blood vessel wall and the retrieval tube 5, making the process of the stent cage 4 contracting into the retrieval tube 5 smoother.

[0042] In this invention, the retrieval tube 5 can be made of a blood-compatible polymer material such as polytetrafluoroethylene or polyurethane. This material also has good conformability, allowing it to naturally conform and advance within the body's natural cavities, such as blood vessels. The surface of the retrieval tube 5 is also coated with a hydrophilic coating. This hydrophilic coating forms a smooth hydrogel layer upon contact with blood, reducing resistance during implantation and facilitating smoother sliding during retrieval. This also makes the unfolding and retraction of the impeller 3 and the stent cage 4 smoother, further reducing the risk of vascular injury.

[0043] See Figure 5 and Figure 6The motor 2 includes an inner tube 201, a stator 202, and a rotor 203. The stator 202 is fixed to the inner wall of the inner tube 201, and the rotor 203 is coaxially rotatably disposed inside the stator 202. The rotor 203 includes a motor shaft 2031 and coil windings fixed to the motor shaft 2031. The distal end of the motor shaft 2031 extends outward through the inner tube 201 and is fixedly connected to the impeller 3. Simultaneously, the motor shaft 2031 and the distal end of the inner tube 201 are rotatably connected via a dynamic sealing mechanism, and the motor shaft 2031 and the proximal end of the inner tube 201 are rotatably connected via a bearing 206. This invention, by employing a dynamic sealing mechanism and a bearing between the distal end and proximal end of the inner tube 201 and the motor shaft 2031 respectively, allows the sealing function and the rotational support function to perform their respective functions. This prevents the perfusion fluid or blood from seeping into the motor 2 and causing short circuits or component corrosion, and also reduces the rotational resistance of the motor shaft 2031 through the bearing 206, thereby improving the energy efficiency of the motor 2.

[0044] Specifically, the dynamic sealing mechanism includes a dynamic sealing housing 204 and a graphite packing 205. The dynamic sealing housing 204 is a hollow cylinder with a through hole along its central axis through which the motor shaft 2031 passes. The dynamic sealing housing 204 is fixed to the far end of the inner tube 201 of the motor. The graphite packing 205 is disposed inside the dynamic sealing housing 204. The motor shaft 2031 passes through the through hole in the middle of the dynamic sealing housing 204 and is in close contact with the graphite packing 205.

[0045] In this embodiment, the graphite packing 205 is mainly made of graphite yarn reinforced with various reinforcing fibers and metal wires, which is precision woven into the dynamic seal housing 204. The graphite packing 205 is pressed into the dynamic seal housing 204, forcing it to press tightly against the outer surface of the motor shaft 2031 and the inner surface of the dynamic seal housing 204. This radial pressure creates a reliable dynamic seal, effectively preventing contact between the perfusion fluid, blood, and internal motor components, thus avoiding motor failure and ensuring the safe operation of the device. Simultaneously, the graphite packing 205 has good thermal conductivity, allowing it to conduct the heat generated by friction between the motor shaft 2031 and the graphite packing 205 to the dynamic seal housing 204, where it is then carried away by the perfusion fluid. This dynamic seal prevents high temperatures from forming.

[0046] See Figure 6 The motor 2 also includes a motor housing 207, which is fixedly mounted on the inner tube 201 of the motor. A sealing cover plate 2071 is provided at the proximal end of the motor housing 207. The sealing cover plate 2071 is sealed to the proximal end of the inner tube 201 of the motor to achieve a seal at the proximal end of the motor 2 and prevent the perfusion fluid and blood from entering the interior of the motor 2 from the proximal end.

[0047] The interventional catheter pump of the present invention also includes a catheter 6, which can be made of flexible materials such as polyurethane or silicone. Its hollow interior is not only the power supply path of the motor 2, but also the path through which the infusion fluid flows.

[0048] It is worth mentioning that a gap is left between the motor housing 207 and the motor inner tube 201. This gap forms, but is not limited to, three perfusion channels 208. The conduit 6 is fixedly connected to the proximal end of the motor housing 207 and communicates with the three perfusion channels 208. At the same time, the perfusion channels 208 pass through the gap between the motor housing 207 and the motor shaft 2031 to the outside of the motor 2. The conduit 6 communicates with the perfusion channels 208 to realize the external supply of perfusion fluid. The perfusion fluid can flow to the outside of the motor 2 through the perfusion channels 208. When the perfusion fluid flows through the perfusion channels 208, it can efficiently remove the heat generated by the operation of the motor 2, realize the active heat dissipation of the motor 2, avoid the damage of high temperature to the blood, and prevent clotting.

[0049] In addition, the interventional catheter pump of the present invention also includes a sensor 7 and multiple cables passing through the catheter 6. The sensor 7 is electrically connected to the corresponding cables. A sensor channel is also provided between the motor housing 207 and the motor inner tube 201. The sensor 7 passes through the sensor channel and its probe is exposed outside the motor housing 207 to monitor blood pressure and flow, providing clinicians with accurate feedback on the patient's circulatory status. This facilitates personalized blood pumping support by adjusting the speed of the motor 2, thereby improving the treatment effect. At the same time, dynamic adjustment based on monitoring data can avoid adverse reactions caused by excessively high or low blood pumping volume.

[0050] Furthermore, the cable is equipped with a connector 8, which is rigidly and sealingly connected to the sealing cover 2071. Some cables pass through the sealing cover 2071 and are electrically connected to the rotor 203 to provide power for the rotation of the motor 2. The cables can be sealed with sealant after passing through the connector 8 to prevent the injection fluid from entering the motor 2 from this point.

[0051] As a standard design, the interventional catheter pump of this invention also includes a pigtail tube 9, which is connected to the inlet tube 101. The pigtail tube 9 can reduce scratching damage to the inner wall of the blood vessel and corresponding tissues during the interventional catheter pump procedure, reduce the risk of complications, and also help maintain a specific position in the ventricle, making it less prone to movement and ensuring the stable operation of the interventional catheter pump.

[0052] Therefore, this invention, by designing elastically deformable support cage wire 401 and blades 301, and cooperating with a recovery pipe 5 with a recovery track 501, forms an interventional catheter pump that can naturally expand and be directionally recovered. In its natural state, the support cage wire 401 is C-shaped, making the support cage 4 form a circular cage structure with a large diameter in the middle and small diameters at both ends. This maximizes the expansion space of the impeller 3 and the effective working area of ​​the blades 301. Under the premise of meeting a certain blood pumping volume requirement, the operating speed of the impeller 3 can be significantly reduced, reducing the risk of hemolysis caused by fluid shear force. At the same time, the blades 301 and the support cage wire 401 do not contact each other, avoiding mechanical interference during operation, optimizing flow field stability, and improving blood pumping efficiency. In the retrieval state, the retrieval track 501 of the retrieval tube 5 corresponds one-to-one with the support cage wire 401, providing a directional contraction path for the support cage wire 401. This allows the stent cage 4 to smoothly extend and contract along the retrieval track 501, avoiding problems such as jamming during retrieval and reducing the difficulty of the retrieval operation and the risk of damage to the vascular endothelium. At the same time, the blade 301 elastically contracts synchronously with the support cage wire 401, adapting to the size requirements of minimally invasive intervention and improving the safety of the operation.

[0053] 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. A high-efficiency and easy-recovery interventional catheter pump, comprising a pump blood vessel line (1), a motor (2) and an impeller (3), the pump blood vessel line (1) is provided with an inlet pipe (101) and an outlet pipe (102), the motor (2) is used for driving the impeller (3) to rotate and work, so as to pump blood from the inlet pipe (101) into the pump blood vessel line (1) and flow out from the outlet pipe (102); characterized in that, Also include: The bracket cage (4) is connected between the pump blood pipeline (1) and the motor (2), the bracket cage (4) includes a plurality of circumferentially uniform spacing distribution and has the elastic deformation ability of support cage silk (401), each support cage silk (401) is inclined distribution relative to the center axis of the bracket cage (4);The impeller (3) is arranged in the inside of the bracket cage (4), the impeller (3) is provided with a plurality of elastic deformation ability of blade (301); And recovery pipe (5), the inner wall of the distal end is circumferentially uniformly spaced and is provided with the same number of recovery track (501) corresponding to the support cage silk (401), the recovery pipe (5) is used for wearing on the bracket cage (4), so that the impeller (3) and the bracket cage (4) are switched from the natural state to the recovery state; Wherein, in the natural state, each support cage silk (401) is C-shaped, so that the bracket cage (4) as a whole presents the circular cage shape of gradually reducing from the middle to both ends, while the blade (301) is relaxed and does not contact the support cage silk (401) under the elastic force of itself;In the recovery state, each support cage silk (401) is axially stretched and distributed along the corresponding recovery track (501) under the constraint of the recovery pipe (5), while the blade (301) is elastically deformed to shrink under the extrusion of the support cage silk (401).

2. The high-efficiency, easily-recyclable, interventional catheter pump of claim 1, wherein, In the natural state, the angle formed by the plane of each support cage silk (401) and the center axis of the bracket cage (4) is θ, and the value of θ is 15°-30°.

3. The high-efficiency, easily-recyclable, interventional catheter pump of claim 1, wherein, Each recovery track (501) is inclined along the inner wall of the recovery pipe (5).

4. The high-efficiency, easily-recyclable, interventional catheter pump of claim 1, wherein, The bracket cage (4) further includes two support rings (402), both ends of each support cage silk (401) are fixedly connected to two support rings (402), one of the support rings (402) is fixedly connected to the outlet pipe (102), and the other support ring (402) is fixedly connected to the motor (2).

5. The high-efficiency, easily-recyclable, interventional catheter pump of claim 1, wherein, Each blade (301) is helical, and a plurality of blades (301) are centrally symmetrically distributed.

6. The high-efficiency, easily-recyclable, interventional catheter pump of claim 1, wherein, The surface of the bracket cage (4) is covered with a protective layer, and the surface of the protective layer and the surface of the recovery pipe (5) are coated with a hydrophilic coating.

7. The high-efficiency, easily-recyclable, interventional catheter pump of claim 1, wherein, The motor (2) includes a motor inner tube (201), a stator (202) and a rotor (203), the stator (202) is fixed on the inner wall of the motor inner tube (201), and the rotor (203) is coaxially arranged in the stator (202);The rotor (203) includes a motor shaft (2031), the distal end of the motor shaft (2031) passes through the motor inner tube (201) and is fixedly connected with the impeller (3), and the motor shaft (2031) is rotatably connected between the distal end and the proximal end of the motor inner tube (201) through a dynamic sealing mechanism and a bearing (206), respectively.

8. The high-efficiency, easily-recyclable, interventional catheter pump of claim 7, wherein, The dynamic sealing mechanism comprises a dynamic sealing shell (204) and a graphite packing (205), the dynamic sealing shell (204) is fixed to the distal end of the motor inner tube (201), the graphite packing (205) is arranged in the dynamic sealing shell (204), and the motor shaft (2031) passes through the middle of the dynamic sealing shell (204) and is in close contact with the graphite packing (205).

9. The high-efficiency, easily-recyclable, interventional catheter pump of claim 7, wherein, The motor (2) further comprises a motor shell (207), the motor shell (207) is fixedly sleeved on the motor inner tube (201), the proximal end of the motor shell (207) is provided with a sealing cover plate (2071), the sealing cover plate (2071) is sealingly connected to the proximal end of the motor inner tube (201); a perfusion channel (208) is arranged between the motor shell (207) and the motor inner tube (201), the interventional catheter pump further comprises a catheter (6), the catheter (6) is fixedly connected to the proximal end of the motor shell (207) and communicates with the perfusion channel (208), and meanwhile the perfusion channel (208) leads to the outside of the motor (2) through the gap between the motor shell (207) and the motor shaft (2031).

10. The high-efficiency, easily-recyclable, interventional catheter pump of claim 9, wherein, The interventional catheter pump further comprises a sensor (7) and a cable penetrating in the catheter (6), a sensor channel is further arranged between the motor shell (207) and the motor inner tube (201), the sensor (7) penetrates in the sensor channel and exposes its probe outside the motor shell (207), so as to monitor the blood pressure and flow; a connector (8) is arranged on the cable, the connector (8) is sealingly connected to the sealing cover plate (2071), and the cable is electrically connected to the rotor (203) through the sealing cover plate (2071).

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