Interventional ventricular assist devices

Abstract

This application relates to the field of medical device technology and provides an interventional ventricular assist device, including an interventional tube, a motor assembly, an infusion cylinder, and an impeller assembly. The interventional tube has an inlet and an outlet. The impeller assembly includes an impeller housed within the interventional tube, and the impeller is capable of rotation to allow liquid to enter the interventional tube from the inlet and flow out from the outlet. The motor assembly generates a rotating magnetic field to drive the impeller to rotate. The infusion cylinder allows perfusion fluid to be injected into the interventional tube, and the perfusion fluid injected through the infusion cylinder provides a thrust to the impeller assembly, enabling the impeller to suspend and rotate within the interventional tube under the combined action of the motor assembly and the perfusion fluid. The interventional ventricular assist device provided by this application enables the impeller to be suspended, avoiding mechanical collisions with the impeller, reducing the risk of blood compatibility issues, and preventing thrombus formation at the bearing.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and more specifically, relates to an interventional ventricular assist device. Background Technology

[0002] Traditional interventional ventricular assist devices use mechanical bearings to rotate the impeller, which involves mechanical friction and poses a potential risk of blood compatibility issues. Furthermore, thrombi can easily form at the bearing connections of mechanical bearings. Summary of the Invention

[0003] The purpose of this application is to provide an interventional ventricular assist device to solve the technical problem of mechanical friction leading to blood compatibility risks in conventional interventional ventricular assist devices.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide an interventional ventricular assist device, including an interventional cannula, a motor assembly, an injection cylinder, and an impeller assembly; wherein:

[0005] The interventional tube has an inlet and an outlet;

[0006] The impeller assembly includes an impeller housed in the interventional tube, the impeller being rotatable to allow liquid to enter the interventional tube from the inlet and flow out from the outlet;

[0007] The motor assembly is capable of generating a rotating magnetic field to drive the impeller to rotate;

[0008] The injection cylinder can supply infusion fluid to the interventional tube, and the infusion fluid injected through the injection cylinder can provide a thrust to the impeller assembly, so that the impeller can be suspended and rotated in the interventional tube under the combined action of the motor assembly and the infusion fluid.

[0009] In one embodiment, the motor assembly has a limiting groove and a hole assembly, the limiting groove being connected to the interventional tube, the hole assembly being connected to the limiting groove, and the injection cylinder being connected to the hole assembly, so that the perfusion fluid injected through the injection cylinder can flow into the interventional tube sequentially through the hole assembly and the limiting groove;

[0010] The impeller assembly also includes a drive shaft, one end of which is fixed to the impeller and the other end extends into the limiting groove. The drive shaft can rotate with the impeller, and the end of the drive shaft away from the impeller can be suspended in the limiting groove.

[0011] The hole assembly is positioned opposite the end of the drive shaft furthest from the impeller, so that the injection fluid injected into the limiting groove through the hole assembly can provide the thrust to the drive shaft, thereby enabling the drive shaft and the impeller to suspend and rotate under the combined action of the motor assembly and the injection fluid.

[0012] In one embodiment, the limiting groove has an opening and a bottom wall opposite to the opening, the opening being connected to the intervention tube; the drive shaft passes through the opening, and the end face of the drive shaft away from the impeller is a convex hemispherical shape.

[0013] The hole assembly includes a first hole and a plurality of second holes, both of which are located on the bottom wall. The first hole and the plurality of second holes are connected to the injection cylinder and the limiting groove. The first hole is opposite to the center of the end face of the drive shaft away from the impeller. The plurality of second holes are arranged at equal intervals around the first hole, and each of the plurality of second holes is opposite to the end face of the drive shaft away from the impeller.

[0014] In one embodiment, the bottom wall of the limiting groove is in the shape of a concave hemispherical surface, and the first hole is located at the center of the bottom wall.

[0015] In one embodiment, the wall of the limiting groove is cylindrical, and the hole assembly includes a first hole and a plurality of second holes. The first hole and the plurality of second holes are connected to the injection cylinder and the limiting groove. The first hole and the plurality of second holes are opposite to the end of the drive shaft away from the impeller. The end face of the first hole is opposite to the end face of the drive shaft away from the impeller. The plurality of second holes are arranged evenly and at intervals around the first hole.

[0016] In one embodiment, the motor assembly includes a housing and a stator sealed within the housing. The housing is sealed to the interventional tube and the injection cylinder. The housing is located at one end of the interventional tube, the liquid outlet is located at the end of the interventional tube near the housing, and the injection cylinder is located on the side of the housing away from the interventional tube.

[0017] In one embodiment, the motor assembly includes a housing and a stator sealed within the housing. The housing is sealed to the intervention tube and the injection cylinder. The limiting groove and the hole assembly are both provided on the housing. The housing has an annular groove that surrounds the limiting groove and is spaced apart from it. The stator is housed in the annular groove.

[0018] In one embodiment, the impeller includes a hub and a magnetic component disposed in the hub. A first mounting groove and a second mounting groove are formed on the hub. The second mounting groove is annular and surrounds the first mounting groove. The end of the drive shaft away from the limiting groove is received in the first mounting groove, and the magnetic component is received in the second mounting groove.

[0019] In one embodiment, the impeller is provided with a guide hole, the guide hole having two openings, one of the openings facing the liquid outlet, and the other opening opposite the limiting groove.

[0020] In one embodiment, the impeller is provided with a plurality of flow guide holes, which are evenly spaced around the rotation axis of the impeller, and one opening of each flow guide hole faces the liquid outlet, while the other opening is opposite to the limiting groove.

[0021] And / or, the impeller is further provided with a first mounting groove, the first mounting groove including a straight hole and an oblique hole communicating with the straight hole, the diameter of the oblique hole gradually increases in the direction away from the straight hole, the oblique hole is opposite to the limiting groove, the opening of the guide hole away from the liquid outlet is located on the side wall of the oblique hole; one end of the drive shaft away from the limiting groove is received in the oblique hole and the straight hole, and is fixedly connected to the side wall of the straight hole.

[0022] The beneficial effects of the interventional ventricular assist device provided in this application are as follows: The interventional ventricular assist device provided in this application generates a rotating magnetic field through a motor assembly to drive the impeller to rotate. The perfusion fluid injected by the injection cylinder provides a thrust to the impeller assembly, enabling the impeller to suspend and rotate under the combined action of the force between the motor assembly and the impeller, and the force exerted by the injected perfusion fluid on the impeller assembly. Compared with mechanical bearings, this avoids mechanical friction between the impeller and other parts, thus avoiding not only the risk of blood contamination from abrasive particles generated by mechanical friction, but also preventing the risk of thrombosis at the mechanical bearing. Furthermore, compared to using flexible components to drive the impeller rotation, the interventional ventricular assist device of this application experiences less vibration during operation, making the patient more comfortable. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or conventional technology 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.

[0024] Figure 1A three-dimensional schematic diagram of the interventional ventricular assist device provided in the embodiments of this application;

[0025] Figure 2 for Figure 1 Another perspective three-dimensional schematic diagram of a mid-interventional ventricular assist device;

[0026] Figure 3 for Figure 2 Exploded view of a mid-interventional ventricular assist device;

[0027] Figure 4 for Figure 1 Side view of a mid-interventional ventricular assist device;

[0028] Figure 5 for Figure 4 A cross-sectional view of a mid-interventional ventricular assist device;

[0029] Figure 6 for Figure 4 Enlarged view of the central area of ​​a mid-interventional ventricular assist device;

[0030] Figure 7 for Figure 1 A three-dimensional schematic diagram of the casing;

[0031] Figure 8 for Figure 7 A top view of the casing;

[0032] Figure 9 for Figure 8 BB section view of the casing;

[0033] Figure 10 for Figure 8 Another angle view of the casing;

[0034] Figure 11 for Figure 10 CC section view of the casing;

[0035] Figure 12 for Figure 6 A three-dimensional schematic diagram of the impeller in the image;

[0036] Figure 13 for Figure 12 A three-dimensional diagram of the impeller from another angle;

[0037] Figure 14 for Figure 13 A top view of the impeller;

[0038] Figure 15 for Figure 14 DD section view of the impeller in the middle;

[0039] Figure 16 This is a structural schematic diagram of the housing provided as another illustration in this application.

[0040] The following are the labeling elements in the figure:

[0041] 100. Interventional ventricular assist device; 10. Interventional cannula; 11. Inlet; 12. Outlet; 13. First channel; 20. Impeller assembly; 21. Impeller; 211. Hub; 2111. First mounting groove; 2111a. Straight hole; 2111b. Angled hole; 2112. Second mounting groove; 2113. Guide hole; 2114. Blade; 2115. Cylindrical section; 2116. Conical section; 212. Magnetic component; 213, sealing cover; 22, drive shaft; 30, motor assembly; 31, stator; 32, housing; 321, annular groove; 322, limiting groove; 3221, slot opening; 3222, bottom wall; 323, column; 324, hole assembly; 3241, first hole; 3242, second hole; 325, step; 33, cover plate; 331, through hole; 40, liquid injection cylinder; 41, second channel; 42, cable outlet. Detailed Implementation

[0042] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0043] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0044] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0046] like Figure 1-6 The illustration shows an interventional ventricular assist device 100 according to one embodiment, particularly relating to a centrifugal magnetic levitation ventricular assist device. This interventional ventricular assist device 100 can be used in both the right and left ventricles. When used in the left ventricle, it can be inserted into the left ventricle via the aorta. The interventional ventricular assist device 100 includes an interventional cannula 10, an impeller assembly 20, a motor assembly 30, and an injection cylinder 40. In the illustrated embodiment, the motor assembly 30 is connected between the interventional cannula 10 and the injection cylinder 40. The motor assembly 30 generates a rotating magnetic field, and the impeller assembly 20 rotates under the rotating magnetic field generated by the motor assembly 30 to provide flow propulsion for a fluid (e.g., blood).

[0047] Please see Figure 1 and Figure 2 The interventional catheter 10 has an inlet 11 and an outlet 12. The inlet 11 is used to allow blood to enter the interventional catheter 10, and the outlet 12 is used to allow blood to flow out of the interventional catheter 10. In the illustrated embodiment, the inlet 11 and outlet 12 are located at opposite ends of the interventional catheter 10. In one embodiment, the interventional catheter 10 has an outer diameter adapted to the inner diameter of the aorta. The interventional catheter 10 has a generally conical tip to facilitate insertion into a blood vessel. The inlet 11 is located at the tip, and multiple inlets are spaced apart around the central axis of the tip. Specifically, the outlet 12 is located on the wall of the interventional catheter 10 at the end away from the inlet 11, i.e., the outlet 12 is radially arranged (in this document, the direction of extension of the rotation axis of the impeller assembly 20 is defined as axial, and the direction perpendicular to the rotation axis of the impeller assembly 20 is defined as radial). There are multiple outlets 12, and the multiple outlets 12 are spaced apart around the central axis of the interventional catheter 10.

[0048] It should be noted that the number of liquid outlets 12 and liquid inlets 11 is not limited to multiple; the number of liquid outlets 12 and liquid inlets 11 can also be one each. The number of liquid outlets 12 and liquid inlets 11 can be set as needed.

[0049] The impeller assembly 20 includes an impeller 21 housed within the interventional tube 10. The impeller 21 is rotatable, allowing fluid (e.g., blood) to enter the interventional tube 10 from the inlet 11 and flow out from the outlet 12. That is, the axis of rotation of the impeller assembly 20 is the same as the axis of rotation of the impeller 21. Specifically, the impeller 21 is positioned near the outlet 12 of the interventional tube 10. When the interventional ventricular assist device 100 is used in the left ventricle, blood in the left ventricle enters the interventional tube 10 from the inlet 11 and then flows out from the outlet 12 into the aorta.

[0050] For a specific example in the illustrated embodiment, please refer to [link / reference]. Figure 6 The impeller 21 includes a hub 211 and a magnetic element 212 disposed in the hub 211. The magnetic element 212 is ring-shaped, and more specifically, the magnetic element 212 is a Heilbeck array magnetic ring.

[0051] The motor assembly 30 generates a rotating magnetic field to drive the impeller 21 to rotate. Specifically, the motor assembly 30 is located at the end of the interventional tube 10 with the outlet 12. The impeller 21 rotates in cooperation with the magnetic element 212 and the motor assembly 30. At certain speeds, the cooperation between the magnetic element 212 and the motor assembly 30 can also achieve radial levitation of the impeller 21. In this document, the state in which the impeller 21 is not in contact with the sidewall of the interventional tube 10, the motor assembly 30, etc., is referred to as the levitation of the impeller 21.

[0052] In this application, an attractive force exists between the motor assembly 30 and the impeller 21, causing the impeller 21 to tend to move towards the motor assembly 30. To achieve axial balance, an infusion fluid is used to provide a hydraulic thrust to the impeller 21. This hydraulic thrust has at least the force to cause the impeller 21 to move away from the motor assembly 30, thereby suspending the impeller 21 axially. Specifically, the injection cylinder 40 can inject infusion fluid into the interventional tube 10, and the infusion fluid injected through the injection cylinder 40 can provide a thrust to the impeller assembly 20, allowing the impeller 21 to suspend and rotate within the interventional tube 10 under the combined action of the motor assembly 30 and the infusion fluid. In other words, the impeller 21 can suspend and rotate under the combined action of the force between the motor assembly 30 and the impeller 21, and the force exerted by the injected infusion fluid on the impeller assembly 20. In other words, this thrust must at least be able to counteract the attractive force between the magnetic component 212 of the motor assembly 30 and the impeller 21, allowing the impeller 21 to suspend axially. The suspended rotation of impeller 21 eliminates mechanical friction between impeller 21 and intervention tube 10.

[0053] The interventional ventricular assist device 100 provided in this application generates a rotating magnetic field through a motor assembly 30 to drive the impeller 21 to rotate. The perfusion fluid provides a thrust to the impeller 21, allowing it to levitate and rotate under the combined action of the force between the motor assembly 30 and the impeller 21, and the force exerted by the injected perfusion fluid on the impeller assembly 20. Compared to mechanical bearings, this avoids mechanical friction between the impeller 21 and other parts, thus preventing not only the risk of blood contamination from abrasive particles generated by mechanical friction but also the risk of thrombosis at the mechanical bearing site. Furthermore, compared to methods using flexible components to drive the impeller 21, the interventional ventricular assist device 100 of this application experiences less vibration during operation, making it more comfortable for the patient.

[0054] In a specific embodiment, the perfusion fluid is glucose containing heparin or physiological saline containing heparin. It is understood that in other embodiments of this application, the perfusion fluid may also be ordinary glucose or physiological saline. The perfusion fluid not only provides thrust to the impeller 21, but the heparin in the perfusion fluid also flushes the impeller 21, preventing blood clotting and reducing thrombus formation.

[0055] For a specific embodiment, please refer to Figure 6 The motor assembly 30 has a limiting groove 322 and a hole assembly 324. The limiting groove 322 is connected to the intervention tube 10, and the hole assembly 324 is connected to the limiting groove 322. The injection cylinder 40 is connected to the hole assembly 324, so that the infusion fluid injected through the injection cylinder 40 can flow into the intervention tube 10 through the hole assembly 324 and the limiting groove 322 in sequence. With this configuration, the infusion fluid can also cool the motor assembly 30.

[0056] Specifically, in the illustrated embodiment, the limiting groove 322 has an opening 3221 and a bottom wall 3222 opposite to the opening 3221, the opening 3221 being connected to the intervention tube 10. Specifically, the limiting groove 322 also has a side wall connected to the bottom wall 3222, the side wall being a cylindrical surface extending axially along the impeller 21. In this case, both the bottom wall 3222 and the side wall of the limiting groove 322 are part of the groove wall of the limiting groove 322.

[0057] The impeller assembly 20 also includes a drive shaft 22, one end of which is fixed to the impeller 21, and the other end extends into a limiting groove 322. The drive shaft 22 can rotate with the impeller 21, and the end of the drive shaft 22 away from the impeller 21 can be suspended in the limiting groove 322. The rotation axis of the drive shaft 22 coincides with the rotation axis of the impeller 21. The hole assembly 324 is opposite to the end of the drive shaft 22 away from the impeller 21, so that the injection fluid injected into the limiting groove 322 through the hole assembly 324 can provide thrust to the drive shaft 22, allowing the drive shaft 22 and the impeller 21 to suspend and rotate under the combined action of the motor assembly 30 and the injection fluid. Therefore, during operation, the injection fluid injected into the limiting groove 322 provides thrust to the drive shaft 22, which transmits this thrust to the impeller 21. Specifically, the drive shaft 22 passes through the groove opening 3221 and extends towards the bottom wall 3222. In the illustrated embodiment, the drive shaft 22 is cylindrical. The end face of the drive shaft 22, away from the impeller 21, is a convex hemispherical surface. The drive shaft 22 is located on the rotation axis of the impeller 21, and the extension direction of the drive shaft 22 is consistent with the rotation axis of the impeller 21.

[0058] For a specific embodiment, please refer to Figure 6 , Figures 8 to 11 The orifice assembly 324 includes a first orifice 3241, which connects the limiting groove 322 and the injection cylinder 40. In one embodiment, one opening of the first orifice 3241 is located on the bottom wall 3222, and the other opening communicates with the injection cylinder 40. The center of the first orifice 3241 is opposite to the end face of the drive shaft 22 away from the impeller 21. Thus, the injection fluid injected from the first orifice 3241 will directly act on the end face of the drive shaft 22 away from the impeller 21, giving the drive shaft 22 a thrust in the axial direction. This thrust cancels out the attraction force exerted by the motor assembly 30 on the magnetic element 212, thereby balancing the drive shaft 22 along its axial direction. Specifically, the central axis of the first orifice 3241 coincides with the rotation axis of the drive shaft 22. The centerline of the first orifice 3241 coincides with the centerline of the limiting groove 322. Understandably, in other embodiments of this application, the diameter of the first hole 3241 may also be the same as the diameter of the limiting groove 322, that is, the limiting groove 322 passes through the motor assembly 30 along the axial direction of the impeller 21, which is not a unique limitation here.

[0059] Furthermore, please participate Figures 8 to 11The hole assembly 324 also includes a plurality of second holes 3242, all of which are connected to the injection cylinder 40 and the limiting groove 322. The first hole 3241 is opposite to the center of the end face of the drive shaft 22 away from the impeller 21. The plurality of second holes 3242 are arranged around the first hole 3241 at equal intervals, and the plurality of second holes 3242 are opposite to the end face of the drive shaft 22 away from the impeller 21. Since the end face of the drive shaft 22 furthest from the impeller 21 is a convex hemispherical surface, by setting multiple second holes 3242 as described above, the thrust of the injection fluid injected from the multiple second holes 3242 on the drive shaft 22 has at least a radial component or is entirely radial. Because the multiple second holes 3242 are evenly distributed circumferentially, the radial thrust of the injection fluid injected from the multiple second holes 3242 on the drive shaft 22 can be balanced, thereby further maintaining the drive shaft 22 in radial suspension balance and preventing mechanical collision interference between the drive shaft 22 and the wall of the limiting groove 322. In one embodiment, the axial direction of the multiple second holes 3242 is parallel to the axial direction of the first hole 3241, and the multiple second holes 3242 are arranged at equal intervals around the central axis of the first hole 3241. It should be noted that the axial direction of the multiple second holes 3242 may not be parallel to the axial direction of the first hole 3241.

[0060] For a specific embodiment, please refer to Figure 6 The bottom wall 3222 of the limiting groove 322 is a concave hemispherical shape, and the first hole 3241 is located at the center of the bottom wall 3222. In one embodiment, the curvature of the bottom wall 3222 of the limiting groove 322 is consistent with the curvature of the end face of the drive shaft 22 away from the impeller 21. It can be understood that the curvature of the bottom wall 3222 of the limiting groove 322 may not be consistent with the curvature of the end face of the drive shaft 22 away from the impeller 21.

[0061] Please see Figure 9 and Figure 11 In the specific illustrated embodiment, there are four second holes 3242, which are arranged at equal intervals around the central axis of the first hole 3241, and all four second holes 3242 are located on the bottom wall of the limiting groove 322. It can be understood that in other embodiments of this application, the number of second holes 3242 may also be three, five or more, depending on actual design requirements, and is not limited here.

[0062] It should be noted that the form of the hole assembly 324 is not limited to the form described above. In other embodiments, the hole assembly 324 includes a plurality of first holes 3241, each of which faces the end face of the drive shaft 22 away from the impeller 21, and the plurality of first holes 3241 are evenly and spaced apart around the rotation axis of the drive shaft 22. In this case, if the hole assembly 324 also has a plurality of second holes 3242, the plurality of second holes 3242 are arranged around the rotation axis of the drive shaft 22 and are located on the periphery of the plurality of second holes 3242.

[0063] For a specific embodiment, please refer to Figure 1 and Figure 2 The motor assembly 30 includes a housing 32 and a stator 31. The housing 32 is sealed to the interventional tube 10 and the injection cylinder 40. The housing 32 is located at the end of the interventional tube 10 near the outlet 12, and the injection cylinder 40 is located on the side of the housing 32 away from the interventional tube 10. Please refer to [link to relevant documentation]. Figure 2 and Figure 6 The intervention tube 10 has a first channel 13, which is connected to the inlet 11 and the outlet 12 respectively. The impeller 21 is housed in the first channel 13. The stator 31 is sealed and installed in the housing 32. The limiting groove 322, the first hole 3241 and the second hole 3242 are all opened in the housing 32. The injection cylinder 40 has a second channel 41 that is connected to the first hole 3241 and the second hole 3242 respectively. By opening the limiting groove 322, the first hole 3241 and the second hole 3242 in the housing 32, the infusion fluid can also cool the motor assembly 30, thereby improving the service life of the motor assembly 30. It is understood that in other embodiments of this application, the intervention tube 10, the housing 32 and the injection cylinder 40 can also be integrally formed when conditions permit, and this is not the only limitation.

[0064] Please see Figure 6 The stator 31 and impeller 21 are spaced apart axially, allowing the impeller 21 to have a greater torque. This enables the impeller 21 to rotate at a lower speed, thereby reducing the shear stress on the blood and minimizing damage to the blood, thus reducing hemolysis. Furthermore, compared to the traditional arrangement where the stator 31 surrounds the impeller 21, the impeller 21 can have a larger size, making manufacturing easier and reducing production costs.

[0065] For a specific embodiment, please refer to Figure 9 and Figure 11The housing 32 has an annular groove 321, which surrounds the limiting groove 322, with the annular groove 321 and the limiting groove 322 spaced apart. Specifically, the central axis of the limiting groove 322 coincides with the central axis of the housing 32, and the annular groove 321 and the limiting groove 322 are coaxially arranged. The opening of the annular groove 321 faces the injection cylinder 40, and the opening of the limiting groove 322 faces the intervention tube 10. That is, the openings of the annular groove 321 and the limiting groove 322 face different ends of the housing 32 along the axial direction, and the annular groove 321 and the limiting groove 322 are not connected to each other. The stator 31 is also annular and is housed in the annular groove 321. The opening of the annular groove 321 is covered by a cover plate 33, which is annular and located on the annular groove 321, thereby sealing the stator 31 and installing it in the housing 32.

[0066] Please see Figure 6 and Figure 7 The housing 32 is cylindrical in shape, and the outer walls of the housing 32, the intervention tube 10, and the injection cylinder 40 are flush with each other. Both ends of the housing 32 are respectively inserted into the intervention tube 10 and the injection cylinder 40. Specifically, a step 325 is formed on the periphery of one end of the housing 32, and the end of the intervention tube 10 away from the inlet 11 is fitted onto the step 325 of the housing 32 and sealed by means of bonding, welding, or hot pressing.

[0067] For a specific embodiment, please refer to Figure 6 A column 323 extends from the center of the annular groove 321, concentrically arranged with the annular groove 321. One end of the column 323 extends outward from the annular groove 321, and the end of the column 323 extending outward from the annular groove 321 is received in the injection cylinder 40. A limiting groove 322, a first hole 3241, and a second hole 3242 are all formed on the column 323. Specifically, the limiting groove 322 extends axially inward from one end of the column 323 toward the intervention tube 10, and the first hole 3241 and the second hole 3242 extend axially inward from the other end of the column 323 to the bottom wall of the limiting groove 322. A second channel 41 extends axially along the injection cylinder 40, and the centerline of the second channel 41 coincides with the centerline of the first hole 3241. The inner diameter of the second channel 41 is larger than the total outer diameter of all the second holes 3242. It should be noted here that the total outer diameter of each second hole 3242 refers to the radius of the circle containing the outermost point of each second hole 3242 in the radial direction. When the inner diameter of the second channel 41 is greater than the total outer diameter of each second hole 3242, the injection fluid injected from the second channel 41 can be injected into the first hole 3241 and each second hole 3242, thereby achieving axial and radial balance of the impeller 21.

[0068] Please see Figure 6The injection cylinder 40 is also provided with a wire outlet hole 42, which is spaced apart from the second channel 41. The cover plate 33 is provided with a through hole 331 at the position of the wire outlet hole 42. The control line of the stator 31 passes through the through hole 331 and the wire outlet hole 42 in sequence and forms a communication connection with the external controller.

[0069] Please see Figure 12 The impeller 21 includes a cylindrical section 2115 and a conical section 2116. The cylindrical section 2115 and the conical section 2116 are integrally connected along the axial direction of the impeller 21. The cylindrical section 2115 is located close to the housing 32, and the conical section 2116 is located away from the housing 32. A magnetic component 212 is installed on the cylindrical section 2115, and one end of the drive shaft 22 is installed at the center of the cylindrical section 2115. Four blades 2114 are distributed on the outer circumference of the conical section 2116. Each blade 2114 is spiral and distributed on the outer wall of the conical section 2116.

[0070] For a specific embodiment, please refer to Figures 13 to 15 The impeller 21 has a first mounting groove 2111 and a second mounting groove 2112, specifically, the hub 211 has the first mounting groove 2111 and the second mounting groove 2112. The openings of the first mounting groove 2111 and the second mounting groove 2112 are both facing the housing 32. The first mounting groove 2111 is columnar and located at the center of the entire impeller 21. The second mounting groove 2112 is annular and surrounds the first mounting groove 2111. The second mounting groove 2112 is concentric with the first mounting groove 2111, that is, the center line of the second mounting groove 2112, the center line of the first mounting groove 2111, and the center line of the entire impeller 21 are the same. The end of the drive shaft 22 away from the limiting groove 322 is received in the first mounting groove 2111, and the magnetic component 212 is received in the second mounting groove 2112. In this way, the magnetic component 212, the drive shaft 22 and the impeller 21 are all concentrically arranged after installation. When the stator 31 applies a rotating magnetic field to the magnetic component 212, the magnetic component 212 drives the drive shaft 22 and the impeller 21 to rotate, and the magnetic component 212, the drive shaft 22 and the impeller 21 rotate coaxially.

[0071] Please see Figure 6 The magnetic component 212 is ring-shaped. After the magnetic component 212 is installed in the second mounting groove 2112, a sealing cover 213 is also provided in the second mounting groove 2112. The sealing cover 213 seals and fixes the magnetic component 212 in the second mounting groove 2112 to prevent the magnetic component 212 from being contaminated by blood or perfusion fluid and losing its effectiveness.

[0072] Please see Figure 6 One end of the drive shaft 22 is inserted into the first mounting groove 2111, and the drive shaft 22 can be fixed in the first mounting groove 2111 by means of interference fit, welding, pasting or fasteners.

[0073] For a specific embodiment, please refer to Figure 6 , Figures 12 to 15 The impeller 21 has a guide hole 2113 with two openings. One opening faces the outlet 12, and the other opening is opposite to the limiting groove 322. In the illustrated embodiment, the guide hole 2113 is specifically located on the hub 211. The guide hole 2113 allows the infusion fluid injected into the limiting groove 322 from the second channel 41 to enter the intervention tube 10 and flow out from the outlet 12. Simultaneously, blood flowing from the first gap between the intervention tube 10 and the impeller 21 to the second gap between the impeller 21 and the housing 32 can flow back to the outlet 12 through the guide hole 2113, forming a secondary flow field to flush the blood and reduce blood retention. Furthermore, along the radial direction of the impeller 21, each guide hole 2113 is located between the first mounting groove 2111 and the second mounting groove 2112.

[0074] Furthermore, there are multiple guide holes 2113 on the impeller 21. The multiple guide holes 2113 are evenly distributed around the rotation axis of the impeller 21, and one opening of each guide hole 2113 faces the liquid outlet 12, and the other opening is opposite to the limiting groove 322.

[0075] In the illustrated embodiment, there are four guide holes 2113, which are specifically formed on the hub 211. It should be noted that the number of guide holes 2113 is not limited to four; there may be one, two, three, or more than four guide holes 2113. The number of guide holes 2113 can be set according to specific needs.

[0076] Furthermore, please participate Figure 6 and Figure 15 The first mounting groove 2111 includes a straight hole portion 2111a and an oblique hole portion 2111b communicating with the straight hole portion 2111a. The diameter of the oblique hole portion 2111b gradually increases in the direction away from the straight hole portion 2111a. The oblique hole portion 2111b is opposite to the limiting groove 322. The opening of the guide hole 2113 away from the liquid outlet 12 is located on the side wall of the oblique hole portion 2111b. One end of the drive shaft 22 away from the limiting groove 322 is received in the oblique hole portion 2111b and the straight hole portion 2111a, and is fixedly connected to the side wall of the straight hole portion 2111a. Thus, after the drive shaft 22 is installed in the first mounting groove 2111, a third gap is provided between the drive shaft 22 and the inner wall of the inclined hole 2111b. The perfusion fluid flowing out from the limiting groove 322 can directly enter the guide hole 2113 through the third gap. That is, the inclined inner wall of the inclined hole 2111b plays a guiding role, quickly guiding the perfusion fluid or blood into the guide hole 2113 to form a secondary flow field.

[0077] In another embodiment of this application, the connection between the hole assembly 324 and the limiting groove 322 can also be in other ways, such as... Figure 16 The wall of the limiting groove 322 is cylindrical. The hole assembly 324 includes a first hole 3241 and multiple second holes 3242. The first hole 3241 and multiple second holes 3242 are all connected to the injection cylinder 40 and the limiting groove 322. The first hole 3241 is positioned opposite to the end face of the drive shaft 22 away from the impeller 21. The multiple second holes 3242 are evenly spaced around the center line of the first hole 3241. Specifically, the multiple second holes 3242 are located on the side wall of the limiting groove 322 and are opposite to the circumference of the drive shaft 22. In this way, by setting multiple second holes 3242, the injection fluid can be introduced into the limiting groove 322 and act on the circumference of the drive shaft 22, thereby achieving radial balance of the drive shaft 22.

[0078] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An interventional ventricular assist device, characterized in that, Includes the interventional cannula, motor assembly, injection cylinder, and impeller assembly; among which: The interventional tube has an inlet and an outlet; The impeller assembly includes an impeller housed in the interventional tube, the impeller being rotatable to allow liquid to enter the interventional tube from the inlet and flow out from the outlet; The motor assembly is capable of generating a rotating magnetic field to drive the impeller to rotate; The injection cylinder can supply infusion fluid to the interventional tube, and the infusion fluid injected through the injection cylinder can provide a thrust to the impeller assembly, so that the impeller can be suspended and rotated in the interventional tube under the combined action of the motor assembly and the infusion fluid. The impeller includes a hub and a magnetic component disposed in the hub, and the impeller is capable of rotating in cooperation with the magnetic component and the motor assembly; There is an attractive force between the motor assembly and the impeller, and the thrust has at least a force capable of causing the impeller to move away from the motor assembly, so that the impeller can be suspended in the axial direction.

2. The interventional ventricular assist device as described in claim 1, characterized in that, The motor assembly has a limiting groove that communicates with the interventional tube. The injection cylinder is also communicated with the limiting groove. The infusion fluid in the injection cylinder can be injected into the limiting groove and can be injected from the limiting groove into the interventional tube. The impeller assembly also includes a drive shaft, one end of which is fixed to the impeller and the other end extends into the limiting groove. The drive shaft can rotate with the impeller, and the end of the drive shaft away from the impeller can be suspended in the limiting groove. The injection fluid injected into the limiting groove from the injection cylinder can provide the thrust to the drive shaft, and the drive shaft can transmit the thrust to the impeller.

3. The interventional ventricular assist device as described in claim 2, characterized in that, The drive shaft is located on the rotation axis of the impeller, and the extension direction of the drive shaft is consistent with the rotation axis of the impeller, and the rotation axis of the drive shaft coincides with the rotation axis of the impeller.

4. The interventional ventricular assist device as described in claim 2, characterized in that, The motor assembly also has a hole assembly that communicates with the limiting groove. The injection cylinder communicates with the hole assembly so that the infusion fluid injected through the injection cylinder can flow into the intervention tube sequentially through the hole assembly and the limiting groove. The hole assembly is opposite to the end of the drive shaft away from the impeller so that the infusion fluid injected into the limiting groove through the hole assembly can provide the thrust to the drive shaft. The drive shaft and the impeller can be suspended and rotated under the combined action of the motor assembly and the infusion fluid.

5. The interventional ventricular assist device as described in claim 4, characterized in that, The limiting groove has an opening and a bottom wall opposite to the opening, and the opening is connected to the intervention tube; the drive shaft passes through the opening, and the end of the drive shaft away from the impeller extends towards the bottom wall; The hole assembly includes a first hole, one opening of which is located on the bottom wall and the other opening communicates with the injection cylinder, so that the first hole connects the limiting groove and the injection cylinder. The opening of the first hole on the bottom wall is opposite to the center of the end face of the drive shaft away from the impeller.

6. The interventional ventricular assist device as described in claim 5, characterized in that, The central axis of the first hole coincides with the rotation axis of the drive shaft; and / or, the central axis of the first hole coincides with the central axis of the limiting groove; and / or, the limiting groove further has a sidewall connected to the bottom wall, the sidewall being a cylindrical surface and extending along the axial direction of the impeller.

7. The interventional ventricular assist device as described in claim 5, characterized in that, The end face of the drive shaft away from the impeller is a convex hemispherical shape; the hole assembly also includes a plurality of second holes, each of which is connected to the injection cylinder and the limiting groove. The plurality of second holes are arranged at equal intervals around the first hole, and each of the plurality of second holes is opposite to the end face of the drive shaft away from the impeller.

8. The interventional ventricular assist device as described in claim 7, characterized in that, The bottom wall of the limiting groove is a concave hemispherical shape, and the first hole is located at the center of the bottom wall.

9. The interventional ventricular assist device as described in claim 4, characterized in that, The hole assembly includes a plurality of first holes, each of which is opposite to the end face of the drive shaft away from the impeller, and the plurality of first holes are evenly and spaced apart around the rotation axis of the drive shaft. Alternatively, the wall of the limiting groove is a cylindrical surface, and the hole assembly includes a first hole and a plurality of second holes. The first hole and the plurality of second holes are all connected to the injection cylinder and the limiting groove. The first hole is opposite to the end face of the drive shaft away from the impeller. The plurality of second holes are arranged evenly and at intervals around the first hole, and the plurality of second holes are opposite to the circumference of the drive shaft.

10. The interventional ventricular assist device as described in claim 4, characterized in that, The motor assembly includes a housing and a stator sealed and installed inside the housing. The housing is sealed and connected to the intervention tube and the injection cylinder. The limiting groove and the hole assembly are both provided on the housing. The housing has an annular groove that surrounds the limiting groove and is spaced apart from it. The stator is housed in the annular groove.

11. The interventional ventricular assist device as described in claim 2, characterized in that, The end of the drive shaft away from the limiting groove is fixedly connected to the wheel hub.

12. The interventional ventricular assist device as described in claim 2, characterized in that, The hub has a first mounting groove and a second mounting groove, the second mounting groove surrounds the first mounting groove, the end of the drive shaft away from the limiting groove is received in the first mounting groove, and the magnetic component is received in the second mounting groove.

13. The interventional ventricular assist device as described in claim 12, characterized in that, The magnetic component is annular, the second mounting groove is annular, and the first mounting groove and the second mounting groove are concentrically arranged; and / or, the opening of the second mounting groove faces the motor assembly, and a sealing cover is also provided in the second mounting groove. The sealing cover is disposed at the opening of the second mounting groove, and the magnetic component is sealed and fixed in the second mounting groove by the sealing cover.

14. The interventional ventricular assist device as described in claim 1, characterized in that, The interventional ventricular assist device also has at least one of the following features: There is an attractive force between the motor assembly and the magnetic component; The magnetic component is a Heilbeck array magnetic ring; The motor assembly includes a stator, which is axially spaced from the impeller, and the stator is capable of applying a rotating magnetic field to the magnetic component.

15. The interventional ventricular assist device as described in claim 2, characterized in that, The impeller is provided with a flow guide hole, which has two openings. One opening of the flow guide hole faces the liquid outlet, and the other opening is opposite to the limiting groove. Alternatively, the impeller may have a first mounting groove, which includes a straight hole and an oblique hole communicating with the straight hole. The diameter of the oblique hole gradually increases in the direction away from the straight hole, and the oblique hole is opposite to the limiting groove. The impeller may also have a guide hole with two openings, one of which faces the liquid outlet, and the other opening is located on the side wall of the oblique hole. The end of the drive shaft away from the limiting groove is received in the oblique hole and the straight hole, and is fixedly connected to the side wall of the straight hole.

16. The interventional ventricular assist device as described in claim 1, characterized in that, The motor assembly is connected between the interventional tube and the injection cylinder; the motor assembly includes a housing and a stator sealed and installed in the housing. The housing is sealed and connected to both the interventional tube and the injection cylinder. The housing is located at one end of the interventional tube, the liquid outlet is located at the end of the interventional tube near the housing, and the injection cylinder is located on the side of the housing away from the interventional tube.

17. An interventional ventricular assist device, characterized in that, include: Interventional catheter; An impeller assembly, comprising an impeller and a drive shaft, wherein the impeller is rotatably housed in the intervention tube, the impeller comprising a hub and a magnetic component disposed in the hub, one end of the drive shaft being fixedly connected to the hub, and the drive shaft being rotatable with the impeller; A motor assembly capable of generating a rotating magnetic field to drive the impeller to rotate, the impeller being able to rotate in cooperation with the magnetic component and the motor assembly; The injection cylinder is capable of injecting perfusion fluid into the interventional tube, and the perfusion fluid injected through the injection cylinder can provide a thrust to the impeller assembly, so that the impeller is suspended in the axial direction, so that the impeller can be suspended and rotated in the interventional tube under the combined action of the motor assembly and the perfusion fluid. The motor assembly has a limiting groove that is connected to the intervention tube. The injection cylinder is also connected to the limiting groove. The infusion fluid injected through the injection cylinder can flow into the intervention tube through the limiting groove. The end of the drive shaft away from the hub extends to the limiting groove and can be suspended in the limiting groove.

18. The interventional ventricular assist device as described in claim 17, characterized in that, The motor assembly is connected between the intervention tube and the injection cylinder. The motor assembly includes a housing and a stator sealed and installed inside the housing. The housing is sealed and connected to both the intervention tube and the injection cylinder. The stator is sealed and installed in the housing. The stator and the impeller are spaced apart axially. The stator can apply a rotating magnetic field to the magnetic component.

19. The interventional ventricular assist device as described in claim 17, characterized in that, There is an attractive force between the motor assembly and the magnetic component, and the thrust has at least the force capable of causing the impeller to move away from the motor assembly, so that the impeller can be suspended in the axial direction.

20. The interventional ventricular assist device as described in claim 17, characterized in that, The hub has a first mounting groove and a second mounting groove. The second mounting groove is annular and surrounds the first mounting groove. The end of the drive shaft away from the limiting groove is received in the first mounting groove, and the magnetic component is received in the second mounting groove.

21. The interventional ventricular assist device according to any one of claims 17-20, characterized in that, The motor assembly also has a hole assembly that communicates with the limiting groove. The injection cylinder communicates with the hole assembly so that the infusion fluid injected through the injection cylinder can flow into the intervention tube sequentially through the hole assembly and the limiting groove. The hole assembly is opposite to the end of the drive shaft away from the hub so that the infusion fluid injected into the limiting groove through the hole assembly can provide the thrust to the drive shaft. The drive shaft and the impeller can be suspended and rotated under the combined action of the motor assembly and the infusion fluid.

Images