CN212308654U

CN212308654U - Interventional ventricular assist device

Info

Publication number: CN212308654U
Application number: CN202021572186.5U
Authority: CN
Inventors: 余顺周
Original assignee: Individual
Current assignee: Shenzhen Core Medical Technology Co Ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-01-08
Anticipated expiration: 2030-07-31

Abstract

The application 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 barrel 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 accommodated in the intervention pipe, and the impeller can rotate to enable liquid to 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 barrel can be used for injecting the perfusate into the intervention pipe, and the perfusate injected through the liquid injection barrel can provide thrust for the impeller assembly, so that the impeller can be suspended and rotated in the intervention pipe under the combined action of the motor assembly and the perfusate. The application provides an intervention formula ventricle auxiliary device can realize the suspension setting of impeller, avoids the mechanical collision of impeller, reduces the compatible risk of blood, avoids forming the thrombus in bearing department.

Description

Interventional ventricular assist device

Technical Field

The application belongs to the technical field of medical equipment, and more particularly relates to an interventional ventricular assist device.

Background

Conventional interventional ventricular assist devices employ mechanical bearings to effect impeller rotation, where there is mechanical friction that carries potential blood compatibility risks and where the mechanical bearings' bearing joints are prone to thrombus formation.

SUMMERY OF THE UTILITY MODEL

An object of the embodiments of the present application is to provide an interventional ventricular assist device to solve the technical problem existing in the conventional art that the interventional ventricular assist device has a risk of blood compatibility caused by mechanical friction.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: the interventional ventricular assist device comprises an interventional tube, a motor assembly, a liquid injection cylinder and an impeller assembly; wherein:

the intervention tube is provided with a liquid inlet and a liquid outlet;

the impeller assembly comprises an impeller, the impeller is accommodated in the intervention tube, and the impeller can rotate to enable liquid to 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 notes liquid section of thick bamboo can supply the perfusate to inject intervene the pipe, and the warp annotate the liquid section of thick bamboo and inject the perfusate can for the impeller subassembly provides a thrust, so that the impeller can the motor element reaches suspension rotation under the combined action of perfusate in intervene in the pipe.

In one embodiment, the motor assembly is provided with a limiting groove and a hole assembly, the limiting groove is communicated with the intervention tube, the hole assembly is communicated with the limiting groove, and the liquid injection barrel is communicated with the hole assembly, so that the perfusion liquid injected by the liquid injection barrel can sequentially flow into the intervention tube through the hole assembly and the limiting groove;

the impeller assembly further comprises a transmission shaft, one end of the transmission shaft is fixedly connected with the impeller, the other end of the transmission shaft extends into the limiting groove, the transmission shaft can rotate along with the impeller, and one end, far away from the impeller, of the transmission shaft can be suspended in the limiting groove;

wherein, the punch combination spare with keeping away from of transmission shaft the one end of impeller is relative, so that the warp the injection of punch combination spare the perfusate in the spacing groove can for the transmission shaft provides thrust, so that the transmission shaft with the impeller can be in motor element with suspension rotation under the combined action of perfusate.

In one embodiment, the limiting groove is provided with a notch and a bottom wall opposite to the notch, and the notch is communicated with the intervention pipe; the transmission shaft penetrates through the notch, and the end face of one end, far away from the impeller, of the transmission shaft is in a convex semispherical shape;

the punch combination spare includes first hole and a plurality of second hole, first hole and a plurality of the second hole all is located on the diapire, first hole and a plurality of the second hole all communicates annotate the liquid section of thick bamboo with the spacing groove, first hole with keeping away from of transmission shaft the terminal surface center of the one end of impeller is relative, and is a plurality of the second hole encircles first hole sets up a week, and is a plurality of equidistantly the second hole all with keeping away from of transmission shaft the terminal surface of the one end of impeller is relative.

In one embodiment, the bottom wall of the limiting groove is concave semispherical, and the first hole is located in the center of the bottom wall.

In one embodiment, a groove wall of the limiting groove is a cylindrical surface, the hole assembly includes a first hole and a plurality of second holes, the first hole and the plurality of second holes are communicated with the liquid injection cylinder and the limiting groove, the first hole and the plurality of second holes are opposite to one end of the transmission shaft far away from the impeller, the first hole is opposite to an end surface of the transmission shaft far away from the end of the impeller, and the plurality of second holes are arranged around the first hole at intervals and uniformly for a circle.

In one of them embodiment, motor element includes casing and seal installation in stator in the casing, the casing with intervene the pipe, annotate the equal sealing connection of liquid section of thick bamboo, the casing sets up intervene the one end of pipe, the liquid outlet is located intervene being close to of pipe the one end of casing, annotate the liquid section of thick bamboo and be located keeping away from of casing one side of intervene the pipe.

In one embodiment, the motor assembly comprises a casing and a stator hermetically mounted in the casing, the casing is hermetically connected with the intervention pipe and the liquid injection cylinder, and the limiting groove and the hole assembly are arranged on the casing; the casing is provided with an annular groove, the annular groove surrounds the limiting groove and is spaced from the limiting groove, and the stator is accommodated in the annular groove.

In one embodiment, the impeller comprises a hub and a magnetic member arranged in the hub, a first mounting groove and a second mounting groove are formed in the hub, the second mounting groove is annular and surrounds the first mounting groove, one end of the transmission shaft, which is far away from the limiting groove, is accommodated in the first mounting groove, and the magnetic member is accommodated in the second mounting groove.

In one embodiment, the impeller is provided with a flow guide hole, the flow guide hole is provided with two openings, one opening of the flow guide hole faces the liquid outlet, and the other opening of the flow guide hole is opposite to the limiting groove.

In one embodiment, the impeller is provided with a plurality of flow guide holes, the flow guide holes are uniformly distributed around a rotating shaft of the impeller at intervals, one opening of each flow guide hole faces the liquid outlet, and the other opening of each flow guide hole is opposite to the limiting groove;

and/or the impeller is further provided with a first mounting groove, the first mounting groove comprises a straight hole part and an inclined hole part communicated with the straight hole part, the aperture of the inclined hole part is gradually increased along the direction far away from the straight hole part, the inclined hole part is opposite to the limiting groove, and the opening of the flow guide hole far away from the liquid outlet is positioned on the side wall of the inclined hole part; one end of the transmission shaft, which is far away from the limit groove, is contained in the inclined hole part and the straight hole part and is fixedly connected with the side wall of the straight hole part.

The application provides an intervention formula ventricle auxiliary device's beneficial effect lies in: the embodiment of the application provides an intervention formula ventricle auxiliary device, it is rotatory in order to drive the impeller to produce rotating magnetic field through motor element, annotate the perfusate that liquid section of thick bamboo injected and give impeller element thrust, so that the impeller can be at the effort between motor element and the impeller, and the perfusate that injects is rotatory to suspension under the combined action of impeller element's effort, for mechanical bearing, the mechanical friction of impeller and other parts has been avoided, not only the abrasive particles that mechanical friction produced to the pollution risk of blood has been avoided, but also the risk of mechanical bearing department thrombus of formation easily has been prevented. Simultaneously, for the mode that adopts flexible component drive impeller rotation, the vibration of the intervention formula ventricle auxiliary device during operation of this application is littleer, makes the patient more comfortable.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments or the conventional technology will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a perspective view of an interventional ventricular assist device according to an embodiment of the present application;

FIG. 2 is another perspective view of the interventional ventricular assist device of FIG. 1;

FIG. 3 is an exploded view of the interventional ventricular assist device of FIG. 2;

FIG. 4 is a side view of the interventional ventricular assist device of FIG. 1;

FIG. 5 is an AA cross-sectional view of the interventional ventricular assist device of FIG. 4;

FIG. 6 is an enlarged view of the central region of the interventional ventricular assist device of FIG. 4;

FIG. 7 is a perspective view of the housing of FIG. 1;

FIG. 8 is a top view of the enclosure of FIG. 7;

FIG. 9 is a BB cross-sectional view of the housing of FIG. 8;

FIG. 10 is another perspective view of the housing of FIG. 8;

FIG. 11 is a cross-sectional view CC of the chassis of FIG. 10;

FIG. 12 is a perspective view of the impeller of FIG. 6;

FIG. 13 is another perspective view of the impeller of FIG. 12;

FIG. 14 is a schematic top view of the impeller in FIG. 13;

FIG. 15 is a DD section view of the impeller of FIG. 14;

fig. 16 is a schematic structural diagram of a chassis according to another embodiment of the present disclosure.

Wherein, in the figures, the respective reference numerals:

100. an interventional ventricular assist device; 10. an access tube; 11. a liquid inlet; 12. a liquid outlet; 13. a first channel; 20. an impeller assembly; 21. an impeller; 211. a hub; 2111. a first mounting groove; 2111a, a straight bore portion; 2111b, an inclined hole portion; 2112. a second mounting groove; 2113. a flow guide hole; 2114. a blade; 2115. a cylindrical section; 2116. a conical section; 212. a magnetic member; 213. a sealing cover; 22. a drive shaft; 30. a motor assembly; 31. a stator; 32. a housing; 321. an annular groove; 322. a limiting groove; 3221. a notch; 3222. a bottom wall; 323. a cylinder; 324. an orifice assembly; 3241. a first hole; 3242. a second hole; 325. a step; 33. a cover plate; 331. a through hole; 40. a liquid injection cylinder; 41. a second channel; 42. and (7) a wire outlet hole.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be 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 be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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 the present application, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1-6, an embodiment of an interventional ventricular assist device 100, and more particularly, to a centrifugal magnetic levitation ventricular assist device. The interventional ventricular assist device 100 can be used in the right ventricle as well as 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 access tube 10 and the injection cartridge 40. The motor assembly 30 is capable of generating a rotating magnetic field and the impeller assembly 20 is capable of rotating under the rotating magnetic field generated by the motor assembly 30 to provide motive force for the flow of a liquid (e.g., blood).

Referring to fig. 1 and 2, the inlet tube 10 has a liquid inlet 11 and a liquid outlet 12. The inlet port 11 is used for feeding blood into the access tube 10, and the outlet port 12 is used for feeding blood out of the access tube 10. In the illustrated embodiment, the inlet port 11 and the outlet port 12 are located at both ends of the intervening tube 10, respectively. In one embodiment, the access tube 10 is of a configuration having an outer diameter that is adapted to the inner diameter of the aorta. The access tube 10 has a generally conical tip to facilitate guided insertion into a blood vessel. The liquid inlet 11 is provided at the tip and a plurality of liquid inlets are arranged at intervals around the central axis of the tip. Specifically, the liquid outlet 12 is located on a wall of the insertion tube 10 at an end away from the liquid inlet 11, that is, the liquid outlet 12 is radially arranged (herein, it is defined that an extending direction of a rotation axis of the impeller assembly 20 is an axial direction, and a direction perpendicular to the rotation axis of the impeller assembly 20 is a radial direction). The liquid outlet 12 is a plurality of, and a plurality of liquid outlets 12 encircle the central axis of intervention pipe 10 and set up a week at interval.

It should be noted that the number of the liquid outlets 12 and the liquid inlets 11 is not limited to a plurality, the number of the liquid outlets 12 and the number of the liquid inlets 11 may be one, and the number of the liquid outlets 12 and the number of the liquid inlets 11 may be set as required.

Impeller assembly 20 comprises an impeller 21, impeller 21 being received in access tube 10, impeller 21 being rotatable to allow liquid (e.g. blood) to enter access tube 10 from inlet port 11 and exit from outlet port 12. I.e. the axis of rotation of the impeller assembly 20, is the axis of rotation of the impeller 21. Specifically, the impeller 21 is disposed near one end of the liquid outlet 12 of the introducing pipe 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 port 11 and then flows out of the interventional tube 10 into the aorta via the outlet port 12.

Specifically, in the illustrated embodiment, referring to fig. 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.

The motor assembly 30 is capable of generating a rotating magnetic field to drive the impeller 21 to rotate. Specifically, the motor assembly 30 is disposed at an end of the access tube 10 having the liquid outlet 12. The impeller 21 is rotated by the cooperation of the magnetic member 212 and the motor assembly 30. The cooperation of the magnetic member 212 and the motor assembly 30 also enables radial levitation of the impeller 21 at certain rotational speeds. In this context, 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 levitation of the impeller 21.

Wherein there is an attractive force between the motor assembly 30 and the impeller 21 to urge the impeller 21 to have a tendency to move closer to the motor assembly 30, and in order to achieve balance in the axial direction, in the present application, the perfusion fluid is used to provide the impeller 21 with a hydrodynamic thrust force having at least a force capable of urging the impeller 21 to move away from the motor assembly 30 to achieve suspension of the impeller 21 in the axial direction. That is, the infusion cylinder 40 can be used for infusing the infusion solution into the interventional tube 10, and the infusion solution infused through the infusion cylinder 40 can provide a thrust force for the impeller assembly 20, so that the impeller 21 can be suspended and rotated in the interventional tube 10 under the combined action of the motor assembly 30 and the infusion solution. That is, the impeller 21 can be rotated in a floating manner by 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. In other words, the thrust force at least counteracts 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. While the suspended rotation of the impeller 21 is such that there is no mechanical friction between the impeller 21 and the interventional tube 10.

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 force to the impeller 21 through the perfusate, so that the impeller 21 can rotate in a suspended manner under the combined action of the acting force between the motor assembly 30 and the impeller 21 and the acting force of the injected perfusate on the impeller assembly 20, and with respect to the mechanical bearing, the mechanical friction between the impeller 21 and other parts is avoided, thereby not only avoiding the risk of blood pollution caused by abrasive particles generated by the mechanical friction, but also preventing the risk of easy thrombus formation at the mechanical bearing. Meanwhile, compared with a mode that the flexible component is adopted to drive the impeller 21 to rotate, the interventional type ventricular assist device 100 provided by the application has smaller vibration during working, so that a patient feels more comfortable.

In specific embodiments, the perfusate is glucose containing heparin or normal saline containing heparin. It will be appreciated that in other implementations of the present application, the perfusate may also be normal glucose or saline. The perfusate can not only provide thrust for the impeller 21, but also the heparin in the perfusate can wash the impeller 21 and the like, thereby preventing blood coagulation and reducing the formation of thrombus.

In a specific embodiment, referring to fig. 6, the motor assembly 30 is provided with a limiting groove 322 and a hole assembly 324, the limiting groove 322 is communicated with the interventional tube 10, the hole assembly 324 is communicated with the limiting groove 322, and the liquid injection barrel 40 is communicated with the hole assembly 324, so that the perfusion liquid injected by the liquid injection barrel 40 can sequentially flow into the interventional tube 10 through the hole assembly 324 and the limiting groove 322. So set up, the perfusate can also play cooling's effect to motor element 30.

Specifically, in the illustrated embodiment, the retaining groove 322 has a notch 3221 and a bottom wall 3222 opposite to the notch 3221, and the notch 3221 is in communication with the access tube 10. Specifically, the limiting groove 322 further has a side wall connected to the bottom wall 3222, the side wall being a cylindrical surface and extending in 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.

The impeller assembly 20 further includes a transmission shaft 22, one end of the transmission shaft 22 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 one end of the transmission shaft 22 far away from the impeller 21 can be suspended in the limiting groove 322. The axis of rotation of the drive shaft 22 coincides with the axis of rotation of the impeller 21. Wherein, the hole assembly 324 is opposite to the end of the transmission shaft 22 far away from the impeller 21, so that the perfusion fluid injected into the limit groove 322 through the hole assembly 324 can provide thrust for the transmission shaft 22, so that the transmission shaft 22 and the impeller 21 can rotate in a suspending way under the combined action of the motor assembly 30 and the perfusion fluid. Then, at this time, in operation, the perfusion fluid injected into the limiting groove 322 provides a thrust force to the driving shaft 22, and the driving shaft 22 transmits the thrust force to the impeller 21. Specifically, the driving shaft 22 is disposed through the slot 3221 and extends toward the bottom wall 3222. In the illustrated embodiment, the drive shaft 22 is cylindrical. The end surface of the transmission shaft 22 at the end far away from the impeller 21 is in a convex semispherical shape. The drive shaft 22 is located on the rotation axis of the impeller 21, and the drive shaft 22 extends in the same direction as the rotation axis of the impeller 21.

In a specific embodiment, referring to fig. 6, 8 to 11, the hole assembly 324 includes a first hole 3241, and the first hole 3241 communicates the limiting 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 communicated with the liquid injection cylinder 40, and the first hole 3241 is opposite to the end surface center of one end of the transmission shaft 22 far away from the impeller 21. Thus, the perfusion fluid injected from the first hole 3241 directly acts on the end surface of the end of the drive shaft 22 away from the impeller 21, giving the drive shaft 22 a thrust force in the axial direction, which counteracts the attraction force given to the magnetic member 212 by the motor assembly 30, so that the drive shaft 22 is balanced in the axial direction thereof. Specifically, the central axis of the first bore 3241 coincides with the rotational axis of the drive shaft 22. The center line of the first hole 3241 coincides with the center line of the stopper groove 322. It is understood that in other embodiments of the present application, the aperture of the first hole 3241 may be the same as the aperture of the limiting groove 322, that is, the limiting groove 322 extends through the motor assembly 30 along the axial direction of the impeller 21, and is not limited herein.

Further, please refer to fig. 8 to 11, the hole assembly 324 further includes a plurality of second holes 3242, the plurality of second holes 3242 are all communicated with the liquid injection cylinder 40 and the limiting groove 322, the first hole 3241 is opposite to the center of the end surface of the end of the transmission shaft 22 far 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 surface of the end of the transmission shaft 22 far away from the impeller 21. Because the end surface of the end, far away from the impeller 21, of the transmission shaft 22 is a convex hemispherical surface, and the plurality of second holes 3242 are arranged in the above manner, at least a component force in the radial direction or all the component forces in the radial direction of the perfusate injected from the plurality of second holes 3242 to the thrust of the transmission shaft 22 exist, and because the plurality of second holes 3242 are uniformly distributed in the circumferential direction, the radial thrust of the perfusate injected from the plurality of second holes 3242 to the transmission shaft 22 can be balanced with each other, so that the transmission shaft 22 can further keep suspension balance in the radial direction, and the transmission shaft 22 is prevented from generating mechanical collision interference with the groove wall of the limiting groove 322. In one embodiment, the plurality of second holes 3242 are axially parallel to the first holes 3241, and the plurality of second holes 3242 are disposed around the central axis of the first holes 3241 at equal intervals. Note that the plurality of second holes 3242 may not be parallel to the axial direction of the first hole 3241.

In a specific embodiment, referring to fig. 6, the bottom wall 3222 of the limiting groove 322 is concave and hemispherical, and the first hole 3241 is located at the center of the bottom wall 3222. In one embodiment, the bottom wall 3222 of the retaining groove 322 has a curvature corresponding to the curvature of the end surface of the drive shaft 22 at the end remote from the impeller 21. It will be appreciated that the curvature of the bottom wall 3222 of the retaining groove 322 may not correspond to the curvature of the end surface of the drive shaft 22 distal from the impeller 21.

Referring to fig. 9 and 11, in the embodiment shown in the figure, there are four second holes 3242, four second holes 3242 are disposed 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 is understood that in other embodiments of the present application, the number of the second holes 3242 may also be three, five or more, according to the actual design requirement, and is not limited herein.

It should be noted that the form of the hole assembly 324 is not limited to the above form, and in other embodiments, the hole assembly 324 includes a plurality of first holes 3241, each of the plurality of first holes 3241 is opposite to an end surface of the drive shaft 22 at an end away from the impeller 21, and the plurality of first holes 3241 are uniformly and alternately arranged around the rotation axis of the drive shaft 22. At this time, if the hole assembly 324 further has a plurality of second holes 3242, the plurality of second holes 3242 are disposed around the rotational axis of the driving shaft 22 and are located at the periphery of the plurality of second holes 3242.

In an embodiment, referring to fig. 1 and 2, the motor assembly 30 includes a housing 32 and a stator 31, and the housing 32 is hermetically connected to both the insertion tube 10 and the liquid injection cylinder 40. A housing 32 is disposed at an end of the access tube 10 near the exit port 12, and a filling cylinder 40 is disposed at a side of the housing 32 away from the access tube 10. Referring to fig. 2 and 6, the inlet tube 10 has a first channel 13, the first channel 13 is respectively communicated with the liquid inlet 11 and the liquid outlet 12, and the impeller 21 is accommodated in the first channel 13. The stator 31 is hermetically mounted on the casing 32, the limiting groove 322, the first hole 3241 and the second hole 3242 are all disposed on the casing 32, and the liquid injection tube 40 is disposed with a second channel 41 respectively communicating with the first hole 3241 and the second hole 3242. Through all setting up spacing groove 322, first hole 3241 and second hole 3242 in casing 32 for the perfusate can also play cooling's effect to motor element 30, improves motor element 30's life. It is understood that in other embodiments of the present application, the insertion tube 10, the housing 32 and the liquid injection cylinder 40 may be integrally formed, if the conditions allow, and the present application is not limited thereto.

Referring to fig. 6, the stator 31 and the impeller 21 are axially spaced, so that the impeller 21 has a larger torque, and thus the impeller 21 can rotate at a lower rotation speed, thereby reducing the shear stress of the impeller 21 on blood, reducing the damage of the impeller 21 on blood, and reducing hemolysis. Compared with the traditional mode that the stator 31 is arranged around the impeller 21, the impeller 21 can have a larger size, is more convenient to manufacture, and is beneficial to reducing the manufacturing cost.

In an embodiment, referring to fig. 9 and 11, the casing 32 is provided with an annular groove 321, the annular groove 321 is disposed 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 axially coincides with the center of the housing 32, and the annular groove 321 is coaxially disposed with the limiting groove 322. The opening of the annular groove 321 faces the liquid injection cylinder 40, 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 respectively face different ends of the casing 32 in the axial direction, and the annular groove 321 and the limiting groove 322 are not communicated with each other. The stator 31 is also annular, and the stator 31 is received in the annular groove 321. The opening of the annular groove 321 is covered with a cover plate 33, the cover plate 33 is annular, and the cover plate 33 is disposed on the annular groove 321, thereby sealing the stator 31 to the casing 32.

Referring to fig. 6 and 7, the casing 32 is generally cylindrical, and the outer wall of the casing 32, the outer wall of the insertion tube 10 and the outer wall of the liquid injection cylinder 40 are flush with each other. The two ends of the casing 32 are respectively in insertion fit with the intervention tube 10 and the liquid injection cylinder 40. Specifically, a step 325 is formed on the periphery of one end of the casing 32, and one end of the insertion tube 10 away from the liquid inlet 11 is sleeved on the step 325 of the casing 32 and is hermetically connected by means of adhesion, welding, hot pressing, and the like.

In an embodiment, referring to fig. 6, a cylinder 323 extends from the center of the annular groove 321, the cylinder 323 is disposed concentrically with the annular groove 321, one end of the cylinder 323 extends to the outside of the annular groove 321, and one end of the cylinder 323 extending out of the annular groove 321 is received in the liquid injection cylinder 40. The limiting groove 322, the first hole 3241 and the second hole 3242 are formed in the cylinder 323, specifically, the limiting groove 322 axially extends inward from the cylinder 323 toward one end of the insertion tube 10, and the first hole 3241 and the second hole 3242 axially extend inward from the other end of the cylinder 323 to a bottom wall of the limiting groove 322. The second passage 41 extends axially along the barrel 40, the centerline of the second passage 41 coincides with the centerline of the first bore 3241, and the inner diameter of the second passage 41 is larger than the overall outer diameter of each of the second bores 3242. Here, the total outer diameter of each second hole 3242 is a radius of a circle line on which an outermost point of each second hole 3242 in the radial direction is located, and when the inner diameter of the second passage 41 is larger than the total outer diameter of each second hole 3242, the perfusate injected from the second passage 41 can be injected into the first hole 3241 and each second hole 3242, so that the axial and radial balance of the impeller 21 is achieved.

Referring to fig. 6, the liquid injection cylinder 40 further has a wire outlet 42, the wire outlet 42 and the second channel 41 are disposed at an interval, a through hole 331 is disposed at a position of the cover plate 33 on the wire outlet 42, and a control wire of the stator 31 sequentially passes through the through hole 331 and the wire outlet 42 and forms a communication connection with an external controller.

Referring to 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 disposed close to the casing 32, the conical section 2116 is disposed away from the casing 32, the magnetic element 212 is mounted on the cylindrical section 2115, and one end of the transmission shaft 22 is mounted at the center of the cylindrical section 2115. Four blades 2114 are distributed on the periphery of the conical section 2116, and each blade 2114 is spirally distributed on the outer wall of the conical section 2116.

In an embodiment, referring to fig. 13 to 15, the impeller 21 is formed with a first mounting groove 2111 and a second mounting groove 2112, and specifically, the hub 211 is formed with a first mounting groove 2111 and a second mounting groove 2112. The openings of the first installation groove 2111 and the second installation groove 2112 are both disposed toward the casing 32, the first installation groove 2111 is cylindrical and located at the center of the entire impeller 21, the second installation groove 2112 is annular and surrounds the first installation groove 2111, the second installation groove 2112 is disposed concentrically with the first installation groove 2111, that is, the center line of the second installation groove 2112, the center line of the first installation groove 2111, and the center line of the entire impeller 21 are the same. One end of the transmission shaft 22, which is far away from the limiting groove 322, is accommodated in the first installation groove 2111, and the magnetic member 212 is accommodated in the second installation groove 2112, so that the installed magnetic member 212, the transmission shaft 22 and the impeller 21 are concentrically arranged, when the stator 31 applies a rotating magnetic field to the magnetic member 212, the magnetic member 212 drives the transmission shaft 22 and the impeller 21 to rotate, and the magnetic member 212, the transmission shaft 22 and the impeller 21 coaxially rotate.

Referring to fig. 6, the magnetic member 212 is annular, and after the magnetic member 212 is installed in the second installation groove 2112, the second installation groove 2112 is further covered with the sealing cover 213, and the magnetic member 212 is hermetically fixed in the second installation groove 2112 through the sealing cover 213, so as to prevent the magnetic member 212 from being contaminated by blood or perfusion fluid and losing efficacy.

Referring to fig. 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, adhesion, or a fastener.

In a specific embodiment, referring to fig. 6, 12 to 15, a flow guide hole 2113 is formed on the impeller 21, the flow guide hole 2113 has two openings, one opening of the flow guide hole 2113 faces the liquid outlet 12, and the other opening is opposite to the limiting groove 322. In the illustrated embodiment, the flow guide holes 2113 are specifically opened on the hub 211. Through the arrangement of the diversion hole 2113, the perfusion fluid injected into the limiting groove 322 from the second channel 41 can enter the intervention pipe 10 through the diversion hole 2113 and flow out of the liquid outlet 12; meanwhile, the blood flowing from the first gap between the insertion tube 10 and the impeller 21 to the second gap between the impeller 21 and the casing 32 can flow back to the liquid outlet 12 through the flow guide holes 2113 to form a secondary flow field, so that the blood is flushed and the retention of the blood is reduced. And each flow guide hole 2113 is located between the first mounting groove 2111 and the second mounting groove 2112 in the radial direction of the impeller 21.

Furthermore, a plurality of flow guide holes 2113 are formed in the impeller 21, the flow guide holes 2113 are uniformly distributed around the rotation axis of the impeller 21 at intervals, one opening of each flow guide hole 2113 faces the liquid outlet 12, and the other opening is opposite to the limiting groove 322.

In the illustrated embodiment, four diversion holes 2113 are provided, and four diversion holes 2113 are specifically provided in the hub 211. It should be noted that the number of the diversion holes 2113 is not limited to four, and the diversion holes 2113 may also be one, two, three, or more than four, and the number of the diversion holes 2113 may be set according to specific needs.

Further, please refer to fig. 6 and fig. 15, the first mounting groove 2111 includes a straight hole portion 2111a and an inclined hole portion 2111b communicated with the straight hole portion 2111a, the aperture of the inclined hole portion 2111b gradually increases along a direction away from the straight hole portion 2111a, the inclined hole portion 2111b is opposite to the limiting groove 322, and an opening of the flow guide hole 2113 away from the liquid outlet 12 is located on a side wall of the inclined hole portion 2111 b; one end of the transmission shaft 22, which is far away from the limiting groove 322, is accommodated in the inclined hole portion 2111b and the straight hole portion 2111a, and is fixedly connected with the side wall of the straight hole portion 2111 a. Thus, after the transmission shaft 22 is mounted in the first mounting groove 2111, a third gap is formed between the transmission shaft 22 and the inner wall of the inclined hole portion 2111b, and the perfusion fluid flowing out of the limiting groove 322 can directly enter the flow guide hole 2113 from the third gap, i.e., the inclined inner wall of the inclined hole portion 2111b plays a role in flow guide, so that the perfusion fluid or blood is quickly guided to enter the flow guide hole 2113 to form a secondary flow field.

In another embodiment of the present application, the hole assembly 324 may be connected to the limiting groove 322 in other manners, for example, as shown in fig. 16, a groove wall of the limiting groove 322 is a cylindrical surface, 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 communicated with the liquid injection cylinder 40 and the limiting groove 322, the first hole 3241 is disposed opposite to an end surface of the end of the transmission shaft 22 away from the impeller 21, and the plurality of second holes 3242 are disposed around a center line of the first hole 3241 at intervals and uniformly. Specifically, the plurality of second holes 3242 are disposed 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, so that the perfusion fluid can be introduced into the limiting groove 322 and act on the peripheral side of the transmission shaft 22 respectively through the arrangement of the plurality of second holes 3242, thereby realizing the radial balance of the transmission shaft 22.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An interventional ventricular assist device is characterized by comprising an interventional tube, a motor assembly, a liquid injection cylinder and an impeller assembly; wherein:

the intervention tube is provided with a liquid inlet and a liquid outlet;

2. The interventional ventricular assist device of claim 1, wherein the motor assembly has a limiting groove and a hole assembly, the limiting groove is in communication with the interventional tube, the hole assembly is in communication with the limiting groove, and the infusion tube is in communication with the hole assembly, such that infusion fluid infused through the infusion tube can flow into the interventional tube through the hole assembly, the limiting groove, and in sequence;

3. The interventional ventricular assist device of claim 2, wherein the retention slot has a notch and a bottom wall opposite the notch, the notch communicating with the interventional tube; the transmission shaft penetrates through the notch, and the end face of one end, far away from the impeller, of the transmission shaft is in a convex semispherical shape;

4. An interventional ventricular assist device of claim 3, wherein the bottom wall of the retention slot is concave-hemispherical, and the first aperture is located at a center of the bottom wall.

5. The interventional ventricular assist device of claim 2, wherein a wall of the retention groove is a cylindrical surface, the hole assembly includes a first hole and a plurality of second holes, the first hole and the plurality of second holes are both in communication with the fluid injection barrel and the retention groove, the first hole and the plurality of second holes are both opposite to an end of the drive shaft away from the impeller, the first hole is opposite to an end surface of the drive shaft away from the end of the impeller, and the plurality of second holes are spaced and uniformly arranged around the first hole.

6. The interventional ventricular assist device of any one of claims 1 to 5, wherein the motor assembly includes a housing and a stator hermetically mounted in the housing, the housing is hermetically connected to both the interventional tube and the fluid injection cylinder, the housing is disposed at one end of the interventional tube, the fluid outlet is disposed at one end of the interventional tube close to the housing, and the fluid injection cylinder is disposed at one side of the housing away from the interventional tube.

7. An interventional ventricular assist device according to any one of claims 2 to 5, wherein the motor assembly includes a housing and a stator sealingly mounted in the housing, the housing sealingly connected to the interventional tube and the fluid injection barrel, the retention slot and the aperture assembly disposed on the housing; the casing is provided with an annular groove, the annular groove surrounds the limiting groove and is spaced from the limiting groove, and the stator is accommodated in the annular groove.

8. An interventional ventricular assist device according to any one of claims 2 to 5, wherein the impeller includes a hub and a magnetic member disposed in the hub, the hub is formed with a first mounting groove and a second mounting groove, the second mounting groove is annular and surrounds the first mounting groove, an 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.

9. An interventional ventricular assist device according to any one of claims 2 to 5, wherein the impeller has a flow guide hole, the flow guide hole has two openings, one of the openings of the flow guide hole faces the liquid outlet, and the other opening of the flow guide hole is opposite to the limiting groove.

10. An interventional ventricular assist device as claimed in claim 9, wherein the impeller has a plurality of the guiding holes formed thereon, the guiding holes are evenly spaced around a rotation axis of the impeller, and one opening of each guiding hole faces the fluid outlet, and the other opening is opposite to the limiting groove;