Interventional ventricular assist device

Abstract

The invention relates to the technical field of medical instruments, and provides an interventional ventricular assist device which comprises an interventional tube, a motor assembly, a liquid injection cylinder and an impeller assembly. The intervention tube is provided with a liquid inlet and a liquid outlet; the impeller assembly comprises an impeller, the impeller is contained in the intervention pipe, and the impeller can rotate so that liquid can enter the intervention pipe from the liquid inlet and flow out from the liquid outlet; the motor assembly can generate a rotating magnetic field to drive the impeller to rotate. The liquid injection cylinder can be used for injecting perfusate into the interventional tube, and the perfusate injected through the liquid injection cylinder can provide thrust for the impeller assembly, so that the impeller can rotate in the interventional tube in a suspended mode under the combined action of the motor assembly and the perfusate. According to the interventional ventricle assisting device, the impeller can be arranged in a suspended mode, mechanical collision of the impeller is avoided, the blood compatibility risk is reduced, and thrombus is prevented from being formed at the position of the bearing.

Description

Technical Field

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

[0002] Traditional interventional ventricular assist devices use mechanical bearings to achieve impeller rotation, which involves mechanical friction and poses potential blood compatibility risks. In addition, the bearing joints of the mechanical bearings are prone to thrombosis. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide an interventional ventricular assist device to solve the technical problem of mechanical friction of the interventional ventricular assist device in traditional technology causing blood compatibility risk.

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

[0005] The intervention tube has a liquid inlet and a liquid outlet;

[0006] The impeller assembly comprises an impeller, the impeller is received in the intervention tube, and the impeller can rotate so that liquid can enter the intervention tube from the liquid inlet and flow out from the liquid 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 the perfusion liquid to be injected into the intervention tube, and the perfusion liquid injected through the injection cylinder can provide a thrust to the impeller assembly, so that the impeller can be suspended and rotated in the intervention tube under the joint action of the motor assembly and the perfusion liquid.

[0009] In one embodiment, the motor assembly has a limit groove and a hole assembly, the limit groove is communicated with the intervention tube, the hole assembly is communicated with the limit groove, and the injection cylinder is communicated with the hole assembly, so that the perfusion liquid injected through the injection cylinder can flow into the intervention tube through the hole assembly and the limit groove in sequence;

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

[0011] Wherein, the hole assembly is opposite to the end of the transmission shaft away from the impeller, so that the perfusion liquid injected into the limiting groove through the hole assembly can provide the thrust to the transmission shaft, so that the transmission shaft and the impeller can be suspended and rotated under the joint action of the motor assembly and the perfusion liquid.

[0012] In one embodiment, the limiting groove has a notch and a bottom wall opposite to the notch, and the notch is connected to the intervention tube; the transmission shaft is passed through the notch, and the end surface of the transmission shaft away from the impeller is a convex hemispherical surface;

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

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

[0015] In one embodiment, the groove 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 connected to the liquid injection cylinder and the limiting groove, the first hole and the plurality of second holes are opposite to the end of the transmission shaft away from the impeller, the first hole is opposite to the end surface of the end of the transmission shaft away from the impeller, and the plurality of second holes are spaced and evenly arranged around the first hole.

[0016] In one embodiment, the motor assembly includes a casing and a stator sealed in the casing, the casing is sealedly connected to the interventional tube and the injection cylinder, the casing is arranged at one end of the interventional tube, the liquid outlet is arranged at one end of the interventional tube close to the casing, and the injection cylinder is located on a side of the casing away from the interventional tube.

[0017] In one embodiment, the motor assembly includes a casing and a stator sealed in the casing, the casing is sealedly connected to the interventional tube and the injection cylinder, the limit groove and the hole assembly are both arranged on the casing; the casing is provided with an annular groove, the annular groove is arranged around the limit groove and is spaced apart from the limit groove, and the stator is accommodated in the annular groove.

[0018] In one embodiment, the impeller includes a hub and a magnetic component arranged in the hub, a first mounting groove and a second mounting groove are formed on the hub, the second mounting groove is annular and is arranged outside the first mounting groove, an end of the transmission shaft away from the limit groove is accommodated in the first mounting groove, and the magnetic component is accommodated in the second mounting groove.

[0019] In one of the embodiments, a guide hole is provided on the impeller, and the guide hole has two openings, one of the openings of the guide hole faces the liquid outlet, and the other opening is opposite to the limiting groove.

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

[0021] And / or, the impeller is further provided with a first mounting groove, the first mounting groove comprising a straight hole portion and an inclined hole portion connected to the straight hole portion, the aperture of the inclined hole portion gradually increases in a direction away from the straight hole portion, the inclined hole portion 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 inclined hole portion; one end of the transmission shaft away from the limiting groove is accommodated in the inclined hole portion and the straight hole portion, and is fixedly connected to the side wall of the straight hole portion.

[0022] The beneficial effects of the interventional ventricular assist device provided by the present application are as follows: the interventional ventricular assist device provided by the embodiment of the present application generates a rotating magnetic field through the motor assembly to drive the impeller to rotate, and the perfusion liquid injected by the injection cylinder gives a thrust to the impeller assembly, so that the impeller can be suspended and rotated under the combined action of the force between the motor assembly and the impeller, and the force of the injected perfusion liquid on the impeller assembly. Compared with the mechanical bearing, the mechanical friction between the impeller and other parts is avoided, which not only avoids the risk of contamination of blood by abrasive particles generated by mechanical friction, but also prevents the risk of easy formation of thrombus at the mechanical bearing. At the same time, compared with the method of using a flexible component to drive the impeller to rotate, the interventional ventricular assist device of the present application has less vibration during operation, making the patient more comfortable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

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

[0025] Figure 2 for Figure 1 Another perspective diagram of the interventional ventricular assist device;

[0026] Figure 3 for Figure 2 Schematic diagram of an exploded view of an interventional ventricular assist device;

[0027] Figure 4 for Figure 1 Side view of an invasive ventricular assist device;

[0028] Figure 5 for Figure 4 AA cross-sectional view of the mid-invasive ventricular assist device;

[0029] Figure 6 for Figure 4 A magnified view of the middle area of ​​a mid-invasive ventricular assist device;

[0030] Figure 7 for Figure 1 A three-dimensional schematic diagram of a casing in FIG.

[0031] Figure 8 for Figure 7 A schematic top view of the housing in FIG.

[0032] Fig. 9 for Figure 8 BB cross-sectional view of the casing in FIG.

[0033] Fig.10 for Figure 8 Another angle diagram of the casing;

[0034] Fig.11 for Fig.10 CC section view of the casing in FIG.

[0035] Fig.12 for Figure 6 A three-dimensional schematic diagram of the impeller in FIG.

[0036] Fig.13 for Fig.12 Another perspective schematic diagram of the impeller in FIG.

[0037] Fig.14 for Fig.13 A top view of the impeller in FIG.

[0038] Fig.15 for Fig.14 DD section view of the impeller in;

[0039] Fig.16 This is another schematic diagram of the structure of the casing provided by the present application.

[0040] Among them, the reference numerals in the figure are:

[0041] 100, interventional ventricular assist device; 10, intervention tube; 11, liquid inlet; 12, liquid outlet; 13, first channel; 20, impeller assembly; 21, impeller; 211, hub; 2111, first mounting groove; 2111a, straight hole portion; 2111b, inclined hole portion; 2112, second mounting groove; 2113, guide hole; 2114, blade; 2115, cylindrical section; 2116, conical section; 212, Magnetic part; 213, sealing cover; 22, transmission shaft; 30, motor assembly; 31, stator; 32, housing; 321, annular groove; 322, limit groove; 3221, notch; 3222, bottom wall; 323, column; 324, hole assembly; 3241, first hole; 3242, second hole; 325, step; 33, cover plate; 331, through hole; 40, injection cylinder; 41, second channel; 42, wire outlet hole. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

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

[0044] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] like Figure 1-6 As shown, an interventional ventricular assist device 100 according to one embodiment, in particular, relates to a centrifugal magnetic levitation ventricular assist device. The interventional ventricular assist device 100 can be used in the right ventricle, and can also be used in the left ventricle. When it is 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 tube 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 tube 10 and the injection cylinder 40. The motor assembly 30 can generate a rotating magnetic field, and the impeller assembly 20 can rotate under the rotating magnetic field generated by the motor assembly 30 to provide a driving force for the flow of the liquid (e.g., blood).

[0047] See also Figure 1 and Figure 2 , the interventional tube 10 has a liquid inlet 11 and a liquid outlet 12. The liquid inlet 11 is used to supply blood to enter the interventional tube 10, and the liquid outlet 12 is used to supply blood to flow out of the interventional tube 10. In the illustrated embodiment, the liquid inlet 11 and the liquid outlet 12 are respectively located at both ends of the interventional tube 10. In one embodiment, the interventional tube 10 is a structure whose outer diameter is adapted to the inner diameter of the aorta. The interventional tube 10 has a roughly conical tip to facilitate guiding and inserting into a blood vessel. The liquid inlet 11 is provided at the tip, and a plurality of liquid outlets 12 are arranged at intervals around the central axis of the tip. Specifically, the liquid outlet 12 is located on the tube wall of the end of the interventional tube 10 away from the liquid inlet 11, that is, the liquid outlet 12 is radially arranged (in this article, the extension direction of the rotation axis of the impeller assembly 20 is defined as the axial direction, and the direction perpendicular to the rotation axis of the impeller assembly 20 is defined as the radial direction). There are multiple liquid outlets 12, and the multiple liquid outlets 12 are arranged around the central axis of the interventional tube 10.

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

[0049] The impeller assembly 20 includes an impeller 21, which is received in the interventional tube 10. The impeller 21 can rotate so that liquid (e.g., blood) can enter the interventional tube 10 from the liquid inlet 11 and flow out from the liquid outlet 12. That is, the rotation axis of the impeller assembly 20 is the rotation axis of the impeller 21. Specifically, the impeller 21 is disposed near one end of the liquid outlet 12 of the interventional tube 10. When the interventional ventricular assist device 100 is used in the left ventricle, the blood in the left ventricle enters the interventional tube 10 from the liquid inlet 11, and then flows out of the interventional tube 10 through the liquid outlet 12 into the aorta.

[0050] Specifically in the illustrated embodiment, please refer to Figure 6 The impeller 21 includes a hub 211 and a magnetic member 212 disposed in the hub 211. The magnetic member 212 is annular, and further, the magnetic member 212 is a Halbach array magnetic ring.

[0051] The motor assembly 30 can generate a rotating magnetic field to drive the impeller 21 to rotate. Specifically, the motor assembly 30 is arranged at one end of the intervention tube 10 having the liquid outlet 12. The impeller 21 rotates under the cooperation of the magnetic member 212 and the motor assembly 30. At certain rotation speeds, the cooperation of the magnetic member 212 and the motor assembly 30 can also achieve radial suspension of the impeller 21. In this article, the state in which the impeller 21 is not in contact with the side wall of the intervention tube 10, the motor assembly 30, etc. is referred to as the suspension of the impeller 21.

[0052] There is an attractive force between the motor assembly 30 and the impeller 21, so as to cause the impeller 21 to have a tendency to move toward the direction close to the motor assembly 30. In order to achieve axial balance, in the present application, a liquid thrust is provided to the impeller 21 using the perfusion liquid, and the liquid thrust at least has a force that can cause the impeller 21 to move in the direction away from the motor assembly 30, so as to achieve the suspension of the impeller 21 in the axial direction. That is, the injection cylinder 40 can provide the perfusion liquid to be injected into the intervention tube 10, and the perfusion liquid injected through the injection cylinder 40 can provide a thrust to the impeller assembly 20, so that the impeller 21 can be suspended and rotated in the intervention tube 10 under the joint action of the motor assembly 30 and the perfusion liquid. That is, the impeller 21 can be suspended and rotated under the joint action of the action force between the motor assembly 30 and the impeller 21, and the action force of the injected perfusion liquid on the impeller assembly 20. In other words, the thrust should at least be able to offset the attractive force between the motor assembly 30 and the magnetic member 212 of the impeller 21, so that the impeller 21 is suspended in the axial direction. The suspended rotation of the impeller 21 eliminates mechanical friction between the impeller 21 and the intervention tube 10 .

[0053] The interventional ventricular assist device 100 provided by the present application generates a rotating magnetic field through the motor assembly 30 to drive the impeller 21 to rotate, and provides a thrust to the impeller 21 through the perfusion fluid, so that the impeller 21 can be suspended and rotated under the combined action of the force between the motor assembly 30 and the impeller 21, and the force of the injected perfusion fluid on the impeller assembly 20. Compared with the mechanical bearing, the mechanical friction between the impeller 21 and other parts is avoided, which not only avoids the risk of contamination of blood by abrasive particles generated by mechanical friction, but also prevents the risk of easy formation of thrombus at the mechanical bearing. At the same time, compared with the method of using a flexible component to drive the impeller 21 to rotate, the interventional ventricular assist device 100 of the present application has less vibration during operation, making the patient more comfortable.

[0054] In a specific embodiment, the perfusion liquid is glucose containing heparin or saline containing heparin. It is understandable that in other implementations of the present application, the perfusion liquid may also be ordinary glucose or saline. The perfusion liquid can not only provide thrust to the impeller 21, but the heparin in the perfusion liquid can also flush the impeller 21, etc., to prevent blood coagulation and reduce the formation of thrombus.

[0055] In the specific embodiment, please see Figure 6 The motor assembly 30 is provided with a limit groove 322 and a hole assembly 324, the limit groove 322 is communicated with the intervention tube 10, the hole assembly 324 is communicated with the limit groove 322, and the injection cylinder 40 is communicated with the hole assembly 324, so that the perfusion liquid injected by the injection cylinder 40 can flow into the intervention tube 10 through the hole assembly 324 and the limit groove 322 in sequence. In this way, the perfusion liquid can also cool the motor assembly 30.

[0056] Specifically in the illustrated embodiment, the limiting groove 322 has a notch 3221 and a bottom wall 3222 opposite to the notch 3221, and the notch 3221 is connected to the intervention tube 10. Specifically, the limiting groove 322 also has a side wall connected to the bottom wall 3222, and the side wall is a cylindrical surface and extends along the axial direction of the impeller 21. At this time, the bottom wall 3222 and the side wall of the limiting groove 322 are both groove walls of the limiting groove 322.

[0057] The impeller assembly 20 also includes a transmission shaft 22, one end of which is fixedly connected to the impeller 21, and the other end extends into the limiting groove 322. The transmission shaft 22 can rotate with the impeller 21, and the end of the transmission shaft 22 away from the impeller 21 can be suspended in the limiting groove 322. The rotation axis of the transmission shaft 22 coincides with the rotation axis of the impeller 21. Among them, the hole assembly 324 is opposite to the end of the transmission shaft 22 away from the impeller 21, so that the perfusion liquid injected into the limiting groove 322 through the hole assembly 324 can provide thrust to the transmission shaft 22, so that the transmission shaft 22 and the impeller 21 can be suspended and rotated under the joint action of the motor assembly 30 and the perfusion liquid. Then at this time, when working, the perfusion liquid injected into the limiting groove 322 provides thrust to the transmission shaft 22, and the transmission shaft 22 transmits the thrust to the impeller 21. Specifically, the transmission shaft 22 is arranged in the notch 3221 and extends in the direction close to the bottom wall 3222. In the illustrated embodiment, the transmission shaft 22 is cylindrical. The end surface of the transmission shaft 22 away from the impeller 21 is a convex hemispherical surface. The transmission shaft 22 is located on the rotation axis of the impeller 21, and the extension direction of the transmission shaft 22 is consistent with the rotation axis of the impeller 21.

[0058] In a specific embodiment, please refer to Figure 6 , Figures 8 to 11 , the hole assembly 324 includes a first hole 3241, and the first hole 3241 connects the limit groove 322 and the injection cylinder 40. In one embodiment, one opening of the first hole 3241 is located on the bottom wall 3222, and the other opening is connected to the injection cylinder 40, and the first hole 3241 is opposite to the center of the end face of the end of the transmission shaft 22 away from the impeller 21. In this way, the perfusion liquid injected from the first hole 3241 will directly act on the end face of the end of the transmission shaft 22 away from the impeller 21, giving the transmission shaft 22 a thrust in the axial direction, and the thrust and the attraction of the motor assembly 30 to the magnetic part 212 offset each other, so that the transmission shaft 22 is balanced along its axial direction. Specifically, the central axis of the first hole 3241 coincides with the rotation axis of the transmission shaft 22. The center line of the first hole 3241 coincides with the center line of the limit groove 322. It can be understood that in other embodiments of the present application, the aperture of the first hole 3241 may also be the same as the aperture 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 the only limitation here.

[0059] Further, please participate Figures 8 to 11The hole assembly 324 also includes a plurality of second holes 3242, and the plurality of second holes 3242 are all connected to the injection cylinder 40 and the limiting groove 322. The first hole 3241 is opposite to the center of the end surface of the transmission shaft 22 away from the impeller 21, and 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 surface of the transmission shaft 22 away from the impeller 21. Since the end surface of the transmission shaft 22 away from the impeller 21 is a convex hemispherical surface, by setting a plurality of second holes 3242 in the above manner, the thrust of the perfusion liquid injected from the plurality of second holes 3242 on the transmission shaft 22 has at least a radial component or is entirely a radial force. Since the plurality of second holes 3242 are evenly distributed along the circumference, the radial thrust of the perfusion liquid injected from the plurality of second holes 3242 on the transmission shaft 22 can be balanced with each other, thereby further maintaining the suspension balance of the transmission shaft 22 in the radial direction, and preventing the transmission shaft 22 from mechanically colliding and interfering with the groove wall of the limiting groove 322. In one embodiment, the axial direction of the plurality of second holes 3242 is parallel to the axial direction of the first hole 3241, and the plurality of second holes 3242 are arranged around the central axis of the first hole 3241 at equal intervals. It should be noted that the axial direction of the plurality of second holes 3242 may not be parallel to the axial direction of the first hole 3241.

[0060] In the specific embodiment, please see Figure 6 The bottom wall 3222 of the limiting groove 322 is in 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 surface of the transmission shaft 22 away from the impeller 21. It can be understood that the curvature of the bottom wall 3222 of the limiting groove 322 and the curvature of the end surface of the transmission shaft 22 away from the impeller 21 may also be inconsistent.

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

[0062] It should be noted that the form of the hole assembly 324 is not limited to the above form. In other embodiments, the hole assembly 324 includes a plurality of first holes 3241, and the plurality of first holes 3241 are all opposite to the end surface of the end of the transmission shaft 22 away from the impeller 21, and the plurality of first holes 3241 are evenly and spacedly arranged around the rotation axis of the transmission shaft 22. At this time, 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 transmission shaft 22 and are located on the periphery of the plurality of second holes 3242.

[0063] In 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 sealedly connected to the intervention tube 10 and the injection cylinder 40. The housing 32 is disposed at one end of the intervention tube 10 close to the liquid outlet 12, and the injection cylinder 40 is located at a side of the housing 32 away from the intervention tube 10. Figure 2 and Figure 6 , the intervention tube 10 has a first channel 13, the first channel 13 is connected to the liquid inlet 11 and the liquid outlet 12 respectively, and the impeller 21 is accommodated in the first channel 13. The stator 31 is sealed and installed on the housing 32, the limit groove 322, the first hole 3241 and the second hole 3242 are all opened in the housing 32, and the injection cylinder 40 is provided with a second channel 41 connected to the first hole 3241 and the second hole 3242 respectively. By opening the limit groove 322, the first hole 3241 and the second hole 3242 in the housing 32, the perfusion liquid can also cool the motor assembly 30, thereby improving the service life of the motor assembly 30. It can be understood that in other embodiments of the present application, if conditions permit, the intervention tube 10, the housing 32 and the injection cylinder 40 can also be integrally formed, which is not the only limitation here.

[0064] See also Figure 6 The stator 31 and the impeller 21 are arranged at intervals in the axial direction, so that the impeller 21 has a larger torque, so that the impeller 21 can rotate at a lower speed, thereby reducing the shear stress of the impeller 21 on the blood, reducing the damage of the impeller 21 to the blood, and reducing hemolysis. Compared with the traditional stator 31 surrounding the impeller 21, the impeller 21 can have a larger size, which is more convenient to manufacture and helps to reduce the manufacturing cost.

[0065] In a specific embodiment, please refer to Fig. 9 and Fig.11The housing 32 is provided with an annular groove 321, which is arranged around the limiting groove 322, and the annular groove 321 is spaced from the limiting groove 322. 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 the stator 31 is accommodated in the annular groove 321. The opening cover of the annular groove 321 is provided with a cover plate 33, which is annular, and the cover plate 33 is arranged on the annular groove 321, so that the stator 31 is sealed and installed on the housing 32.

[0066] See also Figure 6 and Figure 7 The housing 32 is cylindrical in shape as a whole, and the outer wall of the housing 32, the outer wall of the intervention tube 10 and the outer wall of the injection cylinder 40 are flush with each other. The two ends of the housing 32 are respectively plugged with 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 liquid inlet 11 is sleeved on the step 325 of the housing 32 and a sealed connection is formed by bonding, welding, hot pressing, etc.

[0067] In a specific embodiment, please refer to Figure 6 A column 323 extends from the center of the annular groove 321. The column 323 is concentrically arranged with the annular groove 321. One end of the column 323 extends to the outside of the annular groove 321. The end of the column 323 extending out of the annular groove 321 is received in the injection cylinder 40. The limiting groove 322, the first hole 3241 and the second hole 3242 are all formed in 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. The second channel 41 extends axially along the injection cylinder 40. The center line of the second channel 41 coincides with the center line of the first hole 3241. The inner diameter of the second channel 41 is greater than the total outer diameter of each second hole 3242. It should be noted here that the total outer diameter of each second hole 3242 refers to the radius of the circle on which the outermost points of each second hole 3242 along the radial direction are located. When the inner diameter of the second channel 41 is larger than the total outer diameter of each second hole 3242, the perfusion liquid 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] See also Figure 6The injection cylinder 40 is also provided with a wire outlet hole 42, which is spaced apart from the second channel 41. A through hole 331 is provided on the cover plate 33 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] See also Fig.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 arranged close to the casing 32, and the conical section 2116 is arranged away from the casing 32. The magnetic member 212 is installed on the cylindrical section 2115, and one end of the transmission shaft 22 is installed at the center of the cylindrical section 2115. Four blades 2114 are distributed on the outer periphery of the conical section 2116. Each blade 2114 is spirally distributed on the outer wall of the conical section 2116.

[0070] In a specific embodiment, please refer to Figures 13 to 15 The impeller 21 is provided with a first mounting groove 2111 and a second mounting groove 2112, specifically, the hub 211 is provided with a first mounting groove 2111 and a second mounting groove 2112. The openings of the first mounting groove 2111 and the second mounting groove 2112 are both arranged toward 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 arranged outside the first mounting groove 2111, and the second mounting groove 2112 is arranged concentrically 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 transmission 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, so that the installed magnetic component 212, the transmission shaft 22 and the impeller 21 are all concentrically arranged. When the stator 31 applies a rotating magnetic field to the magnetic component 212, the magnetic component 212 drives the transmission shaft 22 and the impeller 21 to rotate, and the magnetic component 212, the transmission shaft 22 and the impeller 21 rotate coaxially.

[0071] See also Figure 6 The magnetic member 212 is annular in shape. After the magnetic member 212 is installed in the second installation groove 2112, a sealing cover 213 is further provided in the second installation groove 2112. The sealing cover 213 seals and fixes the magnetic member 212 in the second installation groove 2112 to prevent the magnetic member 212 from being contaminated by blood or perfusion fluid and losing its efficacy.

[0072] See also Figure 6 One end of the transmission shaft 22 is inserted into the first installation groove 2111, and the transmission shaft 22 can be fixed in the first installation groove 2111 by interference fit, welding, bonding or fasteners.

[0073] In a specific embodiment, please refer to Figure 6 , Figures 12 to 15 , a guide hole 2113 is provided on the impeller 21, and the guide hole 2113 has two openings, one of which faces the liquid outlet 12, and the other faces the limiting groove 322. In the illustrated embodiment, the guide hole 2113 is specifically provided on the hub 211. Through the provision of the guide hole 2113, the perfusion liquid injected from the second channel 41 into the limiting groove 322 can enter the intervention tube 10 through the guide hole 2113 and flow out from the liquid outlet 12; at the same time, the 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 liquid outlet 12 through the guide hole 2113, forming a secondary flow field to flush the blood and reduce blood retention. And 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 , and the multiple guide holes 2113 are evenly spaced 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 opened on the hub 211. It should be noted that the guide holes 2113 are not limited to four, and the guide holes 2113 may also be one, two, three or more than four, and the number of the guide holes 2113 may be set according to specific needs.

[0076] Further, please participate Figure 6 and Fig.15 The first mounting groove 2111 includes a straight hole portion 2111a and an inclined hole portion 2111b connected to the straight hole portion 2111a. The aperture of the inclined hole portion 2111b gradually increases in a direction away from the straight hole portion 2111a. The inclined 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 inclined hole portion 2111b; one end of the transmission shaft 22 away from the limiting groove 322 is accommodated in the inclined hole portion 2111b and the straight hole portion 2111a, and is fixedly connected to the side wall of the straight hole portion 2111a. In this way, after the transmission shaft 22 is installed in the first installation groove 2111, a third gap is provided between the transmission shaft 22 and the inner wall of the inclined hole portion 2111b, and the perfusion liquid flowing out of the limiting groove 322 can directly enter the guide hole 2113 from the third gap, that is, the inclined inner wall of the inclined hole portion 2111b plays a role of guiding flow, quickly guiding the perfusion liquid or blood into the guide hole 2113, and forming a secondary flow field.

[0077] In another embodiment of the present application, the hole assembly 324 and the limiting groove 322 may be connected in other ways, such as Fig.16 The groove wall of the limiting groove 322 is a cylindrical surface, and the hole assembly 324 includes a first hole 3241 and a plurality of second holes 3242. The first hole 3241 and the plurality of second holes 3242 are both connected to the injection cylinder 40 and the limiting groove 322. The first hole 3241 is arranged opposite to the end surface of the end of the transmission shaft 22 away from the impeller 21, and the plurality of second holes 3242 are arranged around the center line of the first hole 3241 at intervals and uniformly. Specifically, the plurality of second holes 3242 are located on the side wall of the limiting groove 322, and the plurality of second holes 3242 are opposite to the peripheral side of the transmission shaft 22. In this way, through the arrangement of the plurality of second holes 3242, the perfusion liquid can be introduced into the limiting groove 322 and act on the peripheral side of the transmission shaft 22 respectively, thereby achieving radial balance of the transmission shaft 22.

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

Claims

1. An interventional ventricular assist device, characterized in that: It includes an intervention tube, a motor assembly, a liquid injection cylinder and an impeller assembly; wherein: The intervention tube has a liquid inlet and a liquid outlet; The impeller assembly comprises an impeller, the impeller is received in the intervention tube, and the impeller can rotate so that the liquid can enter the intervention tube from the liquid inlet and flow out from the liquid outlet; The motor assembly is capable of generating a rotating magnetic field to drive the impeller to rotate; The injection cylinder can supply the perfusion liquid to be injected into the intervention tube, and the perfusion liquid injected through the injection cylinder can provide a thrust to the impeller assembly, so that the impeller can be suspended and rotated in the intervention tube under the joint action of the motor assembly and the perfusion liquid.

2. The invasive ventricular assist device according to claim 1, characterized in that: 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 in a direction away from the motor assembly, so that the impeller can be suspended in the axial direction.

3. The invasive ventricular assist device according to claim 1 or 2, characterized in that: The motor assembly has a limiting groove, the limiting groove is communicated with the intervention tube, the injection cylinder is communicated with the limiting groove, and the perfusion liquid in the injection cylinder can be injected into the limiting groove and can be injected into the intervention tube from the limiting groove; The impeller assembly also includes a transmission shaft, one end of which is fixedly connected to the impeller, and the other end extends into the limiting groove. The transmission shaft can rotate with the impeller, and the end of the transmission shaft away from the impeller can be suspended in the limiting groove. The perfusion liquid injected into the limiting groove from the injection cylinder can provide the thrust to the transmission shaft, and the transmission shaft can transmit the thrust to the impeller.

4. The invasive ventricular assist device according to claim 3, characterized in that: The transmission shaft is located on the rotation axis of the impeller, and the extension direction of the transmission shaft is consistent with the rotation axis of the impeller, and the rotation axis of the transmission shaft coincides with the rotation axis of the impeller.

5. The invasive ventricular assist device according to claim 3, characterized in that: The motor assembly also has a hole assembly, and the hole assembly is connected to the limit groove, and the injection cylinder is connected to the hole assembly, so that the perfusion liquid injected through the injection cylinder can flow into the intervention tube through the hole assembly and the limit groove in sequence; the hole assembly is opposite to the end of the transmission shaft away from the impeller, so that the perfusion liquid injected into the limit groove through the hole assembly can provide the thrust to the transmission shaft, and the transmission shaft and the impeller can be suspended and rotated under the joint action of the motor assembly and the perfusion liquid.

6. The invasive ventricular assist device according to claim 5, characterized in that: The limiting groove has a notch and a bottom wall opposite to the notch, the notch is connected to the intervention tube; the transmission shaft is passed through the notch, and one end of the transmission shaft away from the impeller extends toward the direction close to the bottom wall; The hole assembly includes a first hole, one opening of which is located on the bottom wall, and the other opening is connected to the injection cylinder, so that the first hole connects the limiting groove and the injection cylinder, and the opening of the first hole located on the bottom wall is opposite to the center of the end face of the transmission shaft away from the impeller.

7. The invasive ventricular assist device according to claim 6, characterized in that: The central axis of the first hole coincides with the rotation axis of the transmission shaft; and / or the central axis of the first hole coincides with the central axis of the limiting groove; and / or the limiting groove also has a side wall connected to the bottom wall, the side wall is a cylindrical surface, and extends along the axial direction of the impeller.

8. The invasive ventricular assist device according to claim 6, characterized in that: The end face of the transmission shaft away from the impeller is a convex hemispherical shape; the hole assembly also includes a plurality of second holes, the plurality of second holes are connected to the liquid injection cylinder and the limiting groove, the plurality of second holes are arranged around the first hole at equal intervals, and the plurality of second holes are opposite to the end face of the transmission shaft away from the impeller.

9. The invasive ventricular assist device according to claim 8, characterized in that: The bottom wall of the limiting groove is in a concave hemispherical shape, and the first hole is located at the center of the bottom wall.

10. The invasive ventricular assist device according to claim 5, characterized in that: The hole assembly includes a plurality of first holes, each of which is opposite to an end surface of the transmission shaft away from the impeller, and the plurality of first holes are evenly and spacedly arranged around the rotation axis of the transmission shaft; Alternatively, the groove 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 both connect the injection cylinder and the limiting groove, the first hole is opposite to the end face of the end of the transmission shaft away from the impeller, and the plurality of second holes are spaced and evenly arranged around the first hole, and the plurality of second holes are opposite to the circumferential side of the transmission shaft.

11. The invasive ventricular assist device according to claim 5, characterized in that: The motor assembly includes a casing and a stator sealed in the casing. The casing is sealedly connected to the interventional tube and the injection cylinder. The limit groove and the hole assembly are both arranged on the casing. The casing is provided with an annular groove, which is arranged around the limit groove and is spaced from the limit groove. The stator is received in the annular groove.

12. The invasive ventricular assist device according to claim 3, characterized in that: The impeller comprises a hub and a magnetic component arranged in the hub. The impeller can rotate under the cooperation of the magnetic component and the motor assembly. One end of the transmission shaft away from the limiting groove is fixedly connected to the hub.

13. The invasive ventricular assist device according to claim 12, characterized in that: A first mounting groove and a second mounting groove are formed on the wheel hub. The second mounting groove is arranged outside the first mounting groove. One end of the transmission shaft away from the limiting groove is received in the first mounting groove. The magnetic member is received in the second mounting groove.

14. The invasive ventricular assist device according to claim 13, characterized in that: The second mounting groove is annular, and the first mounting groove is concentrically arranged with the second mounting groove; and / or the opening of the second mounting groove faces the motor assembly, and a sealing cover is further provided in the second mounting groove, and the sealing cover is arranged at the opening of the second mounting groove, and the magnetic part is sealed and fixed in the second mounting groove by the sealing cover.

15. The invasive ventricular assist device according to claim 12, wherein: The invasive ventricular assist device also has at least one of the following features: There is an attractive force between the motor assembly and the magnetic member; The magnetic component is a Halbach array magnetic ring; The motor assembly includes a stator, which is spaced apart from the impeller in the axial direction, and the stator can apply a rotating magnetic field to the magnetic member.

16. The invasive ventricular assist device according to claim 3, characterized in that: The impeller is provided with a guide hole, the guide hole having two openings, one opening of the guide hole faces the liquid outlet, and the other opening faces the limiting groove; Alternatively, the impeller is provided with a first mounting groove, the first mounting groove includes a straight hole portion and an inclined hole portion connected to the straight hole portion, the aperture of the inclined hole portion gradually increases in a direction away from the straight hole portion, and the inclined hole portion is opposite to the limiting groove; the impeller is provided with a guide hole, the guide hole having two openings, one opening of the guide hole faces the liquid outlet, and the other opening is located on the side wall of the inclined hole portion; one end of the transmission shaft away from the limiting groove is accommodated in the inclined hole portion and the straight hole portion, and is fixedly connected to the side wall of the straight hole portion.

17. The invasive ventricular assist device according to claim 1 or 2, characterized in that: The motor assembly is connected between the interventional tube and the injection cylinder; the motor assembly includes a casing and a stator sealed in the casing, the casing is sealedly connected to the interventional tube and the injection cylinder, the casing is arranged at one end of the interventional tube, the liquid outlet is arranged at one end of the interventional tube close to the casing, and the injection cylinder is located on the side of the casing away from the interventional tube.

18. An interventional ventricular assist device, characterized in that: include: Interventional tube; An impeller assembly, the impeller assembly comprising an impeller and a transmission shaft, the impeller being rotatably accommodated in the intervention tube, the impeller comprising a hub and a magnetic member disposed in the hub, one end of the transmission shaft being fixedly connected to the hub, and the transmission shaft being capable of rotating with the impeller; A motor assembly, wherein the motor assembly is capable of generating a rotating magnetic field to drive the impeller to rotate, and the impeller is capable of rotating under the cooperation of the magnetic member and the motor assembly; An injection cylinder, wherein the injection cylinder can supply an injection liquid to be injected into the intervention tube, and the injection liquid injected through the injection cylinder can provide a thrust to the impeller assembly, so that the impeller can be suspended and rotated in the intervention tube under the joint action of the motor assembly and the injection liquid; Among them, the motor assembly has a limiting groove, the limiting groove is connected to the intervention tube, and the injection cylinder is connected to the limiting groove. The perfusion liquid injected through the injection cylinder can flow into the intervention tube through the limiting groove, and the end of the transmission shaft away from the wheel hub extends to the limiting groove and can be suspended in the limiting groove.

19. The invasive ventricular assist device according to claim 18, characterized in that: The motor assembly is connected between the interventional tube and the injection cylinder, the casing is sealed with the interventional tube and the injection cylinder, the stator is seal-mounted on the casing, the stator and the impeller are axially spaced apart, and the stator can apply a rotating magnetic field to the magnetic part.

20. The invasive ventricular assist device according to claim 18, wherein: There is an attractive force between the motor component and the magnetic member, and the thrust has at least a force capable of causing the impeller to move in a direction away from the motor component, so that the impeller can be suspended in the axial direction.

21. The invasive ventricular assist device according to claim 18, wherein: A first mounting groove and a second mounting groove are formed on the wheel hub. The second mounting groove is annular and is arranged outside the first mounting groove. One end of the transmission shaft away from the limiting groove is received in the first mounting groove, and the magnetic member is received in the second mounting groove.

22. The invasive ventricular assist device according to any one of claims 18 to 21, characterized in that: The motor assembly also has a hole assembly, and the hole assembly is connected to the limit groove, and the injection cylinder is connected to the hole assembly, so that the perfusion liquid injected through the injection cylinder can flow into the intervention tube through the hole assembly and the limit groove in sequence; the hole assembly is opposite to the end of the transmission shaft away from the hub, so that the perfusion liquid injected into the limit groove through the hole assembly can provide the thrust to the transmission shaft, and the transmission shaft and the impeller can be suspended and rotated under the joint action of the motor assembly and the perfusion liquid.

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