CN201230980Y - Magnetic force and fluid dynamic-pressure mixed suspended artificial heart blood pump - Google Patents

Abstract

An artificial heart blood pump suspended by mixing magnetic force and fluid dynamic pressure relates to a blood pump for assisting blood flow in the heart, in particular to an artificial heart blood pump suspended by mixing magnetic force and fluid dynamic pressure. The blood pump consists of an outer casing 7 containing a motor stator 8 sleeved on an inner casing 9 containing a head support assembly 1, a rotor assembly, and a tail support assembly 15, and is characterized in that the rotor assembly, the head support assembly 1, and the tail support assembly 15 are assembled In the cylindrical inner shell 9, the rotor assembly bracket is between the head support assembly 1 and the tail support assembly 15; wherein, the center of the head support assembly 1 is the head hemodynamic suspension cone bearing 2; the described The rotor assembly consists of the head hemodynamic suspension cone 3, the impeller 6, the tail permanent magnetic bearing inner ring 10, and the tail hemodynamic suspension cone 13; the center of the tail support assembly 15 is the tail hemodynamic suspension cone bearing 14, and the outer ring 12 of the tail permanent magnetic bearing is embedded in the outer side of the bearing. In the device, the shearing force on the blood is relatively small, the damage to the red blood cells is small, and the chance of hemolysis is reduced.

Description

Artificial heart blood pump suspended by hybrid magnetic force and hydrodynamic pressure

technical field

The utility model relates to a blood pump for assisting blood flow in the heart, in particular to an artificial heart blood pump in which magnetic force and fluid dynamic pressure are mixed and suspended.

Background technique

Artificial hearts mainly include ventricular auxiliary blood pumps and total artificial hearts. From the principle of blood pumping, there are mainly impeller pumps and pulsating pumps. Because the impeller blood pump has the characteristics of small size and high efficiency, the impeller blood pump is currently a research hotspot of the artificial ventricular assisting therapy device. For traditional impeller pumps, since the lubrication and sealing of rotating parts affect the life and blood compatibility of the blood pump, the main popular solutions in the world at this stage are to use non-lubricated bearings, magnetic levitation rotors or liquid floating rotors. However, such as the external bearing type artificial heart blood pump (Patent No. 200610002894) solves the above-mentioned sealing and lubrication problems, but in principle, the blood pumping efficiency is low, and a large proportion of energy waste will become an obstacle to its clinical application; The pump (Application No. 200710039971.7) has a large diameter and a large shearing force, which can greatly damage the formed components of blood, especially red blood cells. The hemolytic performance problem caused by this cannot be overcome. The axial flow embodiment of the pump has too small a gap. The blood supply flow requirement of the blood pump cannot be met; the hydrodynamic bearing blood pump (US2004236420A1) has a complex shape, too many dead ends, and a large area of the liquid floating structure, which makes the time of blood contacting foreign objects longer and increases the chance of thrombus generation.

Contents of the invention

The purpose of the utility model is to provide a magnetic force and hydrodynamic pressure mixed suspension artificial heart blood pump to solve the problems of artificial heart blood pump lubrication, complex shape, serious blood damage and the like.

In order to achieve the above object, the utility model adopts the following technical solutions. An artificial heart blood pump with mixed suspension of magnetic force and hydrodynamic pressure is composed of an outer casing 7 containing a motor stator 8 set on an inner casing 9 containing a head support assembly 1, a rotor assembly, and a tail support assembly 15, and is characterized in that: the rotor Components, the head support assembly 1 and the tail support assembly 15 are assembled in the cylindrical inner shell 9, and the rotor assembly is supported between the head support assembly 1 and the tail support assembly 15, thereby forming a hemodynamic suspension structure; wherein, the The center of the head support assembly 1 is the head hemodynamic suspension cone bearing 2; the rotor assembly consists of the head hemodynamic suspension cone 3, the impeller 6, the tail permanent magnetic bearing inner ring 10, the tail hemodynamic suspension cone 13; the center of the tail support assembly 15 is the tail hemodynamic suspension cone bearing 14, and the tail permanent magnetic bearing outer ring 12 is embedded outside the bearing. The tail dynamic magnetic levitation structure composed of the tail permanent magnetic bearing inner ring 10 and the tail permanent magnetic bearing outer ring 12 enables the blood pump rotor assembly to achieve dynamic automatic balance when rotating at high speed.

In order to facilitate the placement of the device in the blood vessel, the outer shell 7 of the device is cylindrical and forms a sandwich with the inner shell 9. The motor stator 8 is located in the interlayer. One end of the outer shell 7 is sealed and connected to the inner shell 9 through a side plate, and the other end is through an end cover. 11 is airtightly connected with the inner shell 9.

In order to make the blood flow stable, in the head support assembly 1 and the tail support assembly 15 of the device, head hemodynamic pressure suspension cone bearings 2 and tail hemodynamic pressure suspension cone bearings 14 are provided with uniformly distributed head Guide vanes 5 and tail guide vanes 16, wherein the tail guide vanes 16 adopt spiral blades opposite to the direction of rotation of the impeller 6; in addition, at the tail of the tail support assembly 15, that is, behind the bearing, a tail guide is provided. Cone 17.

In order to make the blood less damaged, the diameter of the shaft of the impeller 6 in the rotor assembly is relatively small, and the thickness of the blades in the impeller 6 is relatively small.

In order to easily generate the dynamic pressure liquid suspension layer without affecting the blood flow, the head blood dynamic pressure suspension cone 3 and the tail blood dynamic pressure suspension cone 13 in the rotor assembly are respectively provided with double helix structure head blood The dynamic pressure suspension cone blood groove 18 and the tail blood dynamic pressure suspension cone blood groove 19, and the helical directions of the head blood dynamic pressure suspension cone blood groove 18 and the tail blood dynamic pressure suspension cone blood groove 19 are opposite.

The beneficial effects of the utility model are: 1) Since the utility model is a suspension bearing mixed with magnetic force and hydrodynamic pressure, the bearing is easy to lubricate, has no wear, and the operation of the bearing is more stable and reliable. 2) The shearing force on the blood in the device is relatively small, and the damage to the red blood cells is small, so that the chance of hemolysis is reduced. 3) Since the support assembly of the present utility model is annular and conical, and the diameter of the axle of the impeller 6 is easy to be made small enough, the thickness of the blades in the impeller 6 is easy to be made thin enough, so it is easy to manufacture and install, and the manufacturing cost is low . 4) The utility model has a simple structure and no dead angle in the flow field, so thrombus is not easy to occur.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the artificial heart blood pump mixed with magnetic force and fluid dynamic pressure of the present invention

Figure 2 is a schematic diagram of cooperation between the head blood dynamic pressure suspension cone and the head blood dynamic pressure suspension dynamic pressure suspension cone bearing

Figure 3 Schematic diagram of the shape of the blood groove of the head blood dynamic pressure suspension cone

Figure 4 is a schematic diagram of the cooperation between the tail hemodynamic suspension cone and the tail hemodynamic suspension cone bearing

Figure 5 Schematic diagram of the shape of the blood groove of the tail blood dynamic pressure suspension cone

Figure 6 is a schematic diagram of the relative relationship between the inner ring of the tail permanent magnetic bearing and the outer ring of the tail permanent magnetic bearing

In the figure: 1. Head support assembly, 2. Head hemodynamic pressure suspension cone bearing, 3. Head hemodynamic pressure suspension cone, 4. Interference connecting shaft, 5. Head guide vanes, 6. Rotor assembly, 7. Shell, 8. Motor stator, 9. Inner shell, 10. Inner ring of permanent magnetic bearing at tail, 11. End cover, 12. Outer ring of permanent magnetic bearing at tail, 13. Blood dynamic pressure suspension and dynamic pressure suspension cone at tail, 14 1. Tail blood dynamic pressure suspension dynamic pressure suspension cone bearing, 15. tail support assembly, 16. tail guide vane, 17. tail guide cone. 18. Head blood dynamic pressure suspension cone blood tank, 19. Tail blood dynamic pressure suspension cone blood tank.

Detailed ways

As shown in Figure 1, the artificial heart blood pump disclosed by the utility model mainly includes an outer shell 7 and an inner shell 9. Both the outer shell 7 and the inner shell 9 are cylindrical, and are made of medical titanium alloy TC4. Material production. The outer casing 7 is set outside the inner casing 9 to form a sandwich, and the motor stator 8 is placed in the interlayer; one end of the outer casing 7 is sealed and connected with the inner casing 9 by an annular side plate, and the other end is sealed and connected with the inner casing 9 by an annular end cover 11. The inner shell 9 sequentially places the head support assembly 1 , the rotor assembly and the tail support assembly 15 , and the rotor assembly is supported between the head support assembly 1 and the tail support assembly 15 . Among them, the head support assembly 1 is composed of the head hemodynamic pressure suspension cone bearing 2 and the head guide vane 5, the head hemodynamic pressure suspension cone bearing 2 is located at the center of the head support assembly 1; the head guide vanes 5 are evenly arranged On the periphery of the head blood dynamic pressure suspension cone bearing 2; there is a hole for blood circulation between the bearing and the inner shell 9. The rotor assembly is sequentially composed of the head blood dynamic pressure suspension cone 3, the impeller 6, the tail permanent magnetic bearing inner ring 10, and the tail blood dynamic pressure suspension cone 13. The above components are sequentially connected by the interference connecting shaft 4 passing through the center of each component. One body; on the conical surfaces of the head blood dynamic pressure suspension cone 3 and the tail blood dynamic pressure suspension cone 13, there are respectively helical head blood dynamic pressure suspension cone blood grooves 18 and tail blood dynamic pressure suspension cone blood grooves 19, And the helical direction of the head blood dynamic pressure suspension cone blood groove 18 and the tail blood dynamic pressure suspension cone blood groove 19 is opposite; as shown in Figure 3 and Figure 5; the impeller 6 in the rotor assembly is evenly embedded with permanent magnets in a conventional manner, when When the electrode stator is connected to the power supply, it interacts with the electrode stator to rotate the rotor assembly; the impeller 6 in the rotor assembly is made of medical titanium alloy TC4 material. No more than 1mm. The tail support assembly 15 is composed of the tail hemodynamic suspension cone bearing 14, the tail permanent magnetic bearing outer ring 12, the tail guide vanes 16 and the tail guide cone 17, and the tail hemodynamic suspension cone bearing 14 is located at the center of the tail support assembly 15 , the tail permanent magnetic bearing outer ring 12 is nested outside the tail blood dynamic pressure suspension cone bearing 14; the tail guide vanes 16 are evenly arranged on the periphery of the tail blood dynamic pressure suspension cone bearing 14, and the back of the bearing is the tail guide Cone 17, the hole channel that blood is circulated is arranged between bearing and inner shell 9.

The blood dynamic pressure suspension structure composed of the head support assembly 1 and the tail support assembly 15 introduced by the utility model and the tail magnetic suspension structure composed of the tail permanent magnetic bearing inner ring 10 and the tail permanent magnetic bearing outer ring 12 make the blood pump rotor assembly in the Dynamic automatic balancing can be realized when rotating at high speed. After turning on the stator power supply of the motor, the head blood dynamic pressure suspension cone 3 introduced by the utility model will push the blood into the head blood dynamic pressure suspension cone bearing 2 along its diversion groove when rotating and generate a high pressure area, and the blood will then flow along the The gap between the head blood dynamic pressure suspension cone 3 and the head blood dynamic pressure suspension cone bearing 2 flows out, where a dynamic pressure fluid suspension layer (as shown in Figure 2) is generated, and the dynamic pressure fluid suspension layer produces axial pressure on the rotor assembly. and radial suspension force; similarly, the tail blood dynamic pressure suspension cone 13 pushes the blood along its diversion groove into the tail blood dynamic pressure suspension cone bearing 14 when rotating and generates a high pressure area, and the blood then moves along the tail blood dynamic pressure The gap between the suspension cone 13 and the tail blood dynamic pressure suspension cone bearing 14 flows out, where a dynamic pressure fluid suspension layer (as shown in Figure 4) is generated, and the dynamic pressure fluid suspension layer generates axial and radial suspension forces on the rotor assembly The tail permanent magnetic bearing inner ring 10 and the tail permanent magnetic bearing outer ring 12 (as shown in Figure 6) introduced by the utility model are reversely magnetized, and its effect is to generate forward axial magnetic force before the blood pump system starts, so that the rotor The component is pushed towards the head under the action of this force, so that the gap of the head support component 1 is small, and it is easy to form a suspension layer of dynamic pressure fluid at low speed during startup, so that the rotor component can be suspended quickly. After startup, the rotor The forward axial blood flow force and axial magnetic force on the assembly cause the gap of the tail support assembly 15 to become larger. At this time, the inner ring 10 of the tail permanent magnetic bearing and the outer ring 12 of the tail permanent magnetic bearing rotate relatively at high speed. In the state, the permanent magnetic suspension bearing force is generated in the radial direction and the axial direction to make up for the liquid buoyancy loss of the tail support assembly 15 due to the enlarged gap.

When the device works, the blood first flows through the head guide vanes 5, and then flows to the rotor assembly. Under the action of the motor stator 8, the rotor assembly pushes the blood backward through the rotation of the impeller 6, and the blood flows through the tail support. The assembly 15 flows out of the inner shell 9 after being rectified by the tail guide vane 16 and the tail guide cone 17 .

The diameters of the head support assembly 1, the tail support assembly 15, the tail permanent magnetic bearing inner ring 10 and the tail permanent magnetic bearing outer ring 12 of the utility model can be made very small, so the shearing force is small, and the chance of hemolysis is reduced; the utility model Each part in the new model is also convenient to manufacture and install; and the bearing in the utility model is convenient to lubricate.

Claims (10)

1. the artificial heart blood pump of magnetic force and hydrodynamic mix suspending, be enclosed within the inner shell (9) that contains a supporting component (1), rotor assembly, tail supporting component (15) by the shell that contains motor stator (8) (7) and go up formation, it is characterized in that: rotor assembly, a supporting component (1) and tail supporting component (15) are assemblied in the cylindrical inner shell (9), and the rotor assembly support is between a supporting component (1) and tail supporting component (15); Wherein, the center of described supporting component (1) is a head blood dynamic pressure suspension cone bearing (2); Described rotor assembly is suspended by the dynamic pressure of head blood successively and bores (3), impeller (6), afterbody Permanent-magnet bearing internal ring (10), afterbody blood dynamic pressure suspension awl (13) formation; The center of described tail supporting component (15) is an afterbody blood dynamic pressure suspension cone bearing (14), and the bearing outside is embedded with afterbody Permanent-magnet bearing outer shroud (12).

2. the artificial heart blood pump of magnetic force according to claim 1 and hydrodynamic mix suspending, it is characterized in that: described shell (7) is for cylindrical, form interlayer with inner shell (9), motor stator (8) is positioned at interlayer, shell (7) one ends are tightly connected by side plate and inner shell (9), and the other end is tightly connected by end cap (11) and inner shell (9).

3. the artificial heart blood pump of magnetic force according to claim 1 and 2 and hydrodynamic mix suspending, it is characterized in that: in described the supporting component (1), head blood dynamic pressure suspension cone bearing (2) on every side uniform array distribute head guide vane (5) arranged.

4. the artificial heart blood pump of magnetic force according to claim 3 and hydrodynamic mix suspending is characterized in that: the head guide vane (5) of described supporting component (1) and the head blood dynamic pressure suspension cone bearing (2) at center are structure as a whole.

5. the artificial heart blood pump of magnetic force according to claim 1 and hydrodynamic mix suspending is characterized in that: head blood dynamic pressure suspension awl (3), impeller (6) in the described rotor assembly, afterbody Permanent-magnet bearing internal ring (10), afterbody blood dynamic pressure suspension awl (13) connect as one successively by the interference connecting axle (4) at center.

6. the artificial heart blood pump of magnetic force and hydrodynamic mix suspending according to claim 1 or 5, it is characterized in that: the wheel shaft diameter of described impeller (6) is less than half of the own diameter of impeller (6), and the thickness of blade is no more than 1 millimeter in the impeller (6).

7. the artificial heart blood pump of magnetic force and hydrodynamic mix suspending according to claim 1 or 5, it is characterized in that: the impeller in the described rotor assembly evenly is embedded with permanent magnet in (6).

8. the artificial heart blood pump of magnetic force and hydrodynamic mix suspending according to claim 1 or 5, it is characterized in that: suspend awl (3) and the dynamic pressure of afterbody blood of head blood dynamic pressure in the described rotor assembly suspends and has double-stranded head blood dynamic pressure awl blood groove (18) and the dynamic pressure of the afterbody blood awl blood groove (19) that suspends that suspends on the conical surface of awl (13), and the dynamic pressure of head blood suspends, and to bore the hand of spiral of blood groove (19) opposite for awl blood groove (18) and afterbody blood dynamic pressure suspension.

9. the artificial heart blood pump of magnetic force according to claim 1 and 2 and hydrodynamic mix suspending, it is characterized in that: described tail supporting component (15) afterbody blood dynamic pressure suspension cone bearing (14) on every side uniform array distribute the helical form afterbody guide vane (16) opposite with impeller (6) direction of rotation arranged, and be provided with tail deflection cone (17) in the bearing back.

10. the artificial heart blood pump of magnetic force according to claim 9 and hydrodynamic mix suspending is characterized in that: the afterbody blood dynamic pressure suspension cone bearing (14) of described tail supporting component (15), afterbody guide vane (16), tail deflection cone (17) are structure as a whole.

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