CN105268040B - A kind of centrifugal blood pump of magnetic coupling driving - Google Patents

Abstract

The invention discloses a centrifugal blood pump driven by magnetic coupling, which is mainly used in occasions requiring extracorporeal blood circulation such as extracorporeal circulation assistance and extracorporeal membrane oxygenation in heart surgery. It is composed of a centrifugal pump upper cover, a rotor, an internal driving magnet and a centrifugal pump lower cover. The centrifugal pump adopts the magnetic coupling drive mode to separate the centrifugal pump from the drive, realize the complete closure of the blood circulation circuit, reduce blood pollution, and facilitate disassembly and replacement. The rotor blades of the centrifugal blood pump adopt a streamlined design, which meets the fluid dynamic requirements of the blood pump, which can make the blood flow out of the pump body smoothly and reduce the formation of thrombus. The rotor of the centrifugal pump is connected with the lower cover of the centrifugal pump by means of single-point ball support, which reduces contact friction and avoids damage to the blood caused by heat generated by friction.

Description

A centrifugal blood pump driven by magnetic coupling

technical field

The invention relates to the technical field of centrifugal blood pumps, in particular to a centrifugal blood pump driven by magnetic coupling. The blood pump can separate the drive from the rotor and make blood flow in a closed circuit. It is the core component of an extracorporeal blood circulation device. . It is mainly used in occasions requiring extracorporeal blood circulation such as extracorporeal circulation assistance and extracorporeal membrane oxygenation in cardiac surgery.

Background technique

The blood pump is mainly used in extracorporeal assisted circulation extracorporeal membrane oxygenation and other occasions that require extracorporeal blood circulation. It is a key technology to replace the human heart beating and blood circulation. It is of great significance for the treatment and development of severe emergency and cardiovascular diseases. .

At present, the commonly used blood pumps in the world can be roughly divided into centrifugal blood pumps and rolling blood pumps. Rolling blood pumps use mechanical extrusion to squeeze blood out of the pipeline to form blood circulation power. After pressure, the red blood cells are easily damaged and lead to hemolysis, resulting in greater blood damage, so it can only be used in a short time. The centrifugal blood pump can continuously output blood, and the blood circulation power is formed by the centrifugal force, the blood damage is small, and it can be used for a long time. However, in the existing centrifugal blood pumps, the rotor of the centrifugal blood pump needs to be connected to the motor drive, so that the blood circulation circuit cannot be completely sealed, which is easy to cause blood pollution, and it is not convenient to replace the consumables of the centrifugal blood pump. At the same time, the rotor blades of the existing centrifugal pumps are mostly linear, which easily causes blood turbulence and thrombus formation, so the application effect is not good.

Contents of the invention

In order to overcome the problems that the current rolling blood pump has damage to the blood, the centrifugal blood pump cannot form a closed blood circuit, easily causes blood pollution and easy to form thrombus, etc., the present invention provides a new type of centrifugal blood pump driven by magnetic coupling. The blood pump can be used for a long time without blood damage and blood pollution.

To achieve the above object, the technical scheme of the present invention is as follows:

A centrifugal blood pump driven by magnetic coupling, the blood pump includes a centrifugal pump upper cover, a rotor, an internal drive magnet and a centrifugal pump lower cover; wherein: the centrifugal pump upper cover and the centrifugal pump lower cover form a pump with an inner cavity The casing, the rotor is arranged in the inner cavity of the pump casing, and the internal driving magnet is installed on the rotor through a slot opened on the rotor. The internal driving magnet is an NdFeB magnet.

The upper cover of the centrifugal pump is provided with a blood inlet and a blood outlet. The upper end surface of the centrifugal pump upper cover is designed to be conical to facilitate the flow of blood into the centrifugal blood pump. The blood inlet is located at the center of the conical upper end surface; A helical blood guide groove is provided on the inner surface of the cover for guiding the blood to flow to the blood outlet.

The rotor of the centrifugal blood pump includes four streamlined blades, the blades are designed to be streamlined so that the blood can flow smoothly in the centrifugal blood pump, reducing blood damage and thrombus formation; the middle position of the rotor is provided with a spherical support for In contact with the lower cover of the centrifugal pump.

On the outer edge of the rotor of the centrifugal blood pump, six slots are uniformly arranged, and internal driving magnets are installed in the slots.

The inner surface of the lower cover of the centrifugal pump is provided with a protruding platform, and the center of the platform is provided with a spherical groove, and the spherical groove cooperates with the spherical support body to form a point contact support mode.

When the centrifugal blood pump is in use, the rotation of the external magnet outside the pump drives the rotation of the internal driving magnet, thereby providing power for the rotor, and the centrifugal force generated by the rotation of the rotor provides power for the outflow of blood, thereby ensuring the blood supply required for human blood circulation. flow and desired blood pressure.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

1. The drive of the centrifugal blood pump of the present invention is separated from the pump head, and the blood circulates in a closed circuit without blood pollution, and can be easily disassembled and replaced. At the same time, the blades of the blood pump adopt a streamlined design, so that the blood flows out smoothly in the blood pump. Thrombosis is greatly reduced.

2. Six magnets are embedded in the outer periphery of the rotor of the centrifugal blood pump of the present invention, and are coupled with the external driving magnet of the blood pump to form a magnetic coupling drive, so that the centrifugal pump is separated from the external drive, and the blood circulation circuit is fully closed, reducing blood pollution and facilitating disassembly replace.

3. The rotor blades of the centrifugal blood pump of the present invention adopt a streamlined design, which meets the requirements of fluid dynamics in the blood pump, can make the blood flow out of the pump body smoothly, and reduce the formation of thrombus.

4. The rotor of the centrifugal blood pump of the present invention is connected to the lower cover of the centrifugal pump by means of single-point ball support, which reduces contact friction and avoids damage to blood caused by heat generated by friction.

Description of drawings

Fig. 1 is a schematic structural diagram of the centrifugal blood pump of the present invention.

Figure 2 is a schematic diagram of the structure of the upper cover of the centrifugal pump.

Fig. 3 is a structural schematic diagram of a centrifugal pump rotor; wherein: (a) and (b) are views from different directions.

Figure 4 is a schematic diagram of the structure of the lower cover of the centrifugal pump.

In the figure: 1-centrifugal pump upper cover; 11-blood inlet; 12-blood outlet; 13-spiral blood guide groove; 14-upper end face; 2-centrifugal pump lower cover; 21-platform; 22-spherical groove; 3-rotor; 31-blade; 32-spherical support; 33-slot; 4-inner driving magnet.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

The purpose of the present invention is to provide a novel magnetic coupling driven centrifugal blood pump which can be used for a long time without blood damage and blood pollution. As shown in Figure 1, the centrifugal blood pump includes a centrifugal pump upper cover 1, a rotor 3, an internal driving magnet 4 and a centrifugal pump lower cover 2; A pump casing with an inner cavity, a rotor 3 is arranged in the inner cavity of the pump casing, and the internal drive magnet 4 is installed on the rotor 4 through a slot opened on the rotor 3, and the internal drive magnet 4 is a neodymium-iron-boron magnet.

The upper cover 1 of the centrifugal pump is provided with a blood inlet 11 and a blood outlet 12. The upper end face 14 of the centrifugal pump upper cover 1 is designed to be conical to facilitate the flow of blood into the centrifugal blood pump. The blood inlet 11 is located on the upper end face of the cone. 14; the inner surface of the upper cover 1 of the centrifugal pump is provided with a helical blood guide groove 13 for guiding the blood to flow to the blood outlet 12, as shown in FIG. 2 .

The structural diagram of the rotor 3 of the centrifugal blood pump is shown in Figure 3, which includes four streamlined blades 31, the blades 31 are designed to be streamlined so that blood can flow smoothly in the centrifugal blood pump, reducing blood damage and thrombus formation; The middle position of the rotor 3 is provided with a spherical support body 32 for contacting with the lower cover 2 of the centrifugal pump.

On the outer edge of the rotor 3 of the centrifugal blood pump, six locking slots 33 are uniformly arranged, and the internal driving magnet 4 is installed in the locking slots 33 .

The structural diagram of the lower cover 2 of the centrifugal pump is shown in Figure 4. The lower cover 2 of the centrifugal pump mainly plays a supporting and closing role, and its inner surface is provided with a protruding platform 21, and the center of the platform 21 is provided with a spherical groove 22. The groove 22 cooperates with the spherical support body 32 to form a point contact support mode, so as to realize the supporting and fixing effect on the rotor of the centrifugal pump. Moreover, the point contact support mode formed by the spherical groove 22 and the spherical support body 32 greatly reduces the contact support area and reduces the generation of contact friction and frictional heat.

When the centrifugal blood pump of the present invention is used, the internal drive magnet 4 can be coupled with the external magnet. When the external magnet outside the pump rotates to drive the internal drive magnet 4 to rotate, it provides power for the rotor 3, forming a non-contact magnetic coupling drive, and the rotor 3 The centrifugal force generated by the rotation provides power for the outflow of blood, thus ensuring the blood flow and blood pressure required by the blood circulation of the human body.

Claims (4)

1. A kind of 1. centrifugal blood pump of magnetic coupling driving, it is characterised in that：The blood pump includes centrifugal pump upper cover, rotor, internal drive Moving magnet and centrifugal pump lower cover；Wherein：The centrifugal pump upper cover and centrifugal pump lower cover form the pump case with inner cavity, the pump case Inner cavity in the rotor is set, the internal drive magnet is installed on the rotor by the card slot opened up on rotor； The centrifugal pump upper cover is equipped with blood entry port and blood exports, and the upper end of centrifugal pump upper cover is designed as taper, easy to blood Flow into centrifugal blood pump, blood entry port is arranged on the center of taper upper end；The medial surface of centrifugal pump upper cover opens up spiral shell Rotation shape leads blood groove, and blood outlet is flowed to for guide blood；The rotor of the centrifugal blood pump includes four streamline vanes, institute The centre position for stating rotor is equipped with spherical supporter, is contacted by spherical supporter with centrifugal pump lower cover；

   The platform that described its inner surface of centrifugal pump lower cover is conformed with, the center of platform are equipped with bulbous recess, bulbous recess With the spherical support mates, point contact supporting way is formed.
2. 2. the centrifugal blood pump of magnetic coupling driving according to claim 1, it is characterised in that：The internal drive magnet is Ndfeb magnet.
3. 3. the centrifugal blood pump of magnetic coupling driving according to claim 1, it is characterised in that：The centrifugal blood pump turns Six card slots are uniformly arranged on sub- outer edge, internal drive magnet is installed respectively in card slot.
4. 4. the centrifugal blood pump of magnetic coupling driving according to claim 1, it is characterised in that：The centrifugal blood pump uses When, by pump outside external magnets rotation drive the rotation of internal drive magnet, so as to provide power for rotor, and rotor is rotated and produced Raw centrifugal force provides power for blood outflow, so as to ensure to meet the blood flow needed for blood circulation of human body and required blood pressure.