阅读说明：本技术 一种使用滚珠轴承的离心式心脏泵 (Centrifugal heart pump using ball bearing ) 是由 解启莲 钱坤喜 曹子建 于 2020-12-22 设计创作，主要内容包括：本发明属于医疗器械技术领域,尤其涉及一种使用滚珠轴承的离心式心脏泵；所述使用滚珠轴承的离心式心脏泵由电机、血泵以及注液泵组成,所述电机与所述血泵共用一个定子和一个转子,所述转子通过滚珠轴承设置于所述定子中心处的固定轴上；所述滚珠轴承的内孔与所述定子固定轴紧配合,所述滚珠轴承的外圈与所述转子的内孔壁紧配合,当所述转子旋转时,所述滚珠轴承的外圈跟随所述转子旋转,所述滚珠轴承的内圈与所述固定轴一起固定不转；所述注液泵用于向所述定子与所述转子之间的间隙注液,以液压阻止血液进入所述滚珠轴承,避免血栓和凝血的产生,使滚珠轴承离心式心脏泵的性能与现有电磁悬浮轴承泵比较更安全可靠,且价格低。(The invention belongs to the technical field of medical instruments, and particularly relates to a centrifugal heart pump using a ball bearing; the centrifugal heart pump using the ball bearing comprises a motor, a blood pump and a liquid injection pump, wherein the motor and the blood pump share one stator and one rotor, and the rotor is arranged on a fixed shaft at the center of the stator through the ball bearing; the inner hole of the ball bearing is tightly matched with the stator fixing shaft, the outer ring of the ball bearing is tightly matched with the inner hole wall of the rotor, when the rotor rotates, the outer ring of the ball bearing rotates along with the rotor, and the inner ring of the ball bearing and the fixing shaft are fixed together and do not rotate; the liquid injection pump is used for injecting liquid into a gap between the stator and the rotor so as to prevent blood from entering the ball bearing through hydraulic pressure, so that thrombus and blood coagulation are avoided, and the performance of the ball bearing centrifugal heart pump is safer and more reliable than that of the existing electromagnetic suspension bearing pump and is low in price.)

1. A centrifugal heart pump using ball bearings, characterized in that it is composed of a motor, a blood pump and a priming pump, the motor and the blood pump share a stator and a rotor, the rotor is arranged on a fixed shaft at the center of the stator through ball bearings;

the inner ring of the ball bearing is tightly matched with the fixed shaft, the outer ring of the ball bearing is tightly matched with the inner hole wall of the rotor, when the rotor rotates, the outer ring of the ball bearing rotates along with the rotor, and the inner ring of the ball bearing and the fixed shaft are fixed together and do not rotate;

the liquid injection pump is used for injecting liquid medicine between the stator and the rotor so as to prevent blood from entering the ball bearing.

2. The centrifugal heart pump using ball bearings according to claim 1, wherein an impeller is provided at one end of the rotor, and the priming pump is connected to the other end thereof remote from the impeller, and the priming pump injects a liquid medicine between the stator and the rotor so that the ball bearings are soaked in the liquid medicine.

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to a centrifugal heart pump using a ball bearing.

Background

The dynamic blood pump is a core component of an artificial heart-lung machine and a ventricular assist device and is mainly used for providing power for blood circulation.

In a power blood pump, the most common application at present is an electromagnetic suspension bearing centrifugal pump, however, the electromagnetic suspension bearing centrifugal heart pump is high in manufacturing cost and difficult to popularize, and due to the fact that an electromagnetic principle is adopted, electromagnetic signals interfere system control, serious consequences are easily caused, and safety of the electromagnetic suspension bearing centrifugal heart pump is difficult to guarantee.

The mechanical ball bearing has low cost and mature manufacturing technology, and can obviously reduce the cost and improve the safety and reliability when being applied to a power blood pump. However, ball bearings have hitherto been disabled in cardiac pumps due to the mechanical friction of mechanical ball bearings, which leads to a tendency to clot and thrombus within dynamic blood pumps.

Disclosure of Invention

The invention aims to provide a centrifugal heart pump using ball bearings, and aims to solve the problem that blood coagulation and thrombus are easily formed in a power blood pump due to mechanical friction of mechanical ball bearings.

The embodiment of the invention is realized by the centrifugal heart pump using the ball bearing, wherein the centrifugal heart pump using the ball bearing comprises a motor, a blood pump and a liquid injection pump, the motor and the blood pump share a stator and a rotor, and the rotor is arranged on a fixed shaft at the center of the stator through the ball bearing;

the inner ring of the ball bearing is tightly matched with the fixed shaft, the outer ring of the ball bearing is tightly matched with the inner hole wall of the rotor, when the rotor rotates, the outer ring of the ball bearing rotates along with the rotor, and the inner ring of the ball bearing and the fixed shaft are fixed together and do not rotate;

the liquid injection pump is used for injecting liquid medicine between the stator and the rotor so as to prevent blood from entering the ball bearing.

The centrifugal heart pump using the rolling bearing provided by the embodiment of the invention uses the rolling bearing, and keeps the advantages of mature rolling bearing technology and low cost, on the basis, the rolling bearing can be soaked in normal saline by arranging the liquid injection pump for injecting liquid between the stator and the rotor, and blood is prevented from entering the rolling bearing along a gap between the stator and the rotor to generate thrombus or blood coagulation.

Drawings

Fig. 1 is a structural diagram of a centrifugal heart pump using ball bearings according to an embodiment of the present invention.

In the drawings: 1. a blood inlet; 2. a housing; 3. an impeller; 4. a blood outlet; 5. an iron core; 6. a liquid injection pump; 7. a fixed shaft; 8. rotor magnetic steel; 9. ball bearings.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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 invention and are not intended to limit the invention.

Specific implementations of the present invention are described in detail below with reference to specific embodiments.

As shown in fig. 1, a structural diagram of a centrifugal heart pump using ball bearings according to an embodiment of the present invention is shown, the centrifugal heart pump using ball bearings is composed of a motor, a blood pump and an infusion pump 6, the motor and the blood pump share a stator and a rotor, and the rotor is arranged on a fixed shaft 7 at the center of the stator through a ball bearing 9;

the inner ring of the ball bearing 9 is tightly matched with the fixed shaft 7, the outer ring of the ball bearing 9 is tightly matched with the inner hole wall of the rotor, when the rotor rotates, the outer ring of the ball bearing 9 rotates along with the rotor, and the inner ring of the ball bearing and the fixed shaft 7 are fixed together and do not rotate;

the liquid injection pump 6 is used for injecting liquid medicine between the stator and the rotor so as to prevent blood from entering the ball bearing 9.

In the embodiment of the invention, it can be understood that the blood pump further comprises a shell 2, main components of the motor and the blood pump are arranged in the shell 2, the shell 2 of the motor part and the shell 2 of the blood pump part can be integrally formed, or can be in a split structure, and if the split structure is adopted, the joint should be sealed. The motor and the blood pump share a stator and a rotor, the stator comprises an iron core 5 and a winding, and alternating current is introduced into the winding to generate a rotating magnetic field; the rotor comprises rotor magnetic steel 8. The stator forms a cylindrical space in the middle, which is preferably cylindrical, in which the rotor can rotate. In the embodiment of the present invention, a fixing shaft 7 is disposed at the center of the cylindrical space in the middle of the stator, the fixing shaft 7 is disposed along the axial direction of the cylindrical space, and optionally, the fixing shaft 7 is fixedly connected with the housing 2. The rotor is arranged on the stationary shaft 7 through a ball bearing 9 and rotates relative to the stationary shaft 7 under the action of the rotating magnetic field of the stator. Alternatively, in the present embodiment, the number of the ball bearings 9 may not be unique, for example, a pair, three, two pairs, and the like are provided.

In the embodiment of the present invention, a priming pump 6 is further provided, and the priming pump 6 is used for injecting the chemical liquid into the region between the stator and the rotor, specifically, the region between the fixed shaft 7 and the rotor, and the two regions are usually communicated with each other, so the present invention is referred to as the priming pump. By injecting the liquid medicine, the ball bearing 9 is operated in the liquid medicine, so that blood cannot enter the above-mentioned region, thereby preventing thrombus and blood coagulation caused by mechanical massage of the ball bearing 9. Optionally, the liquid medicine may specifically be normal saline, the ball bearing 9 may be completely immersed in the liquid medicine, and the liquid injection pump 6 may be implemented by various existing pumps having a liquid injection function, such as a vane pump, a plunger pump, and the like. It should be understood that the infusion pump 6 and the motor and/or the blood pump may be connected as a whole through the housing 2, the infusion pump 6 and the motor and/or the blood pump may also be provided separately, and the infusion pump 6 introduces the liquid medicine output by the infusion pump 6 into the corresponding area only through the infusion pipeline.

In one embodiment of the present invention, an impeller 3 is disposed at one end of the rotor, the liquid injection pump 6 is connected to the other end of the rotor away from the impeller 3, and the liquid injection pump 6 injects a liquid medicine between the stator and the rotor so as to immerse the ball bearing 9 in the liquid medicine.

In the embodiment of the present invention, the blood is transported by centrifugal action generated by rotation of the impeller 3, the blood inlet 1 may be provided at a position on the casing 2 at the end of the impeller 3, and the blood outlet 4 may be provided at a position on the side of the impeller 3. It will be understood that the end portion is a surface parallel or approximately parallel to the plane of rotation of the impeller 3 and directly opposite the axis of rotation of the impeller 3, and the side surface is an arc-shaped surface surrounding the tips of the blades of the impeller 3. The shape, principle, and the like of the impeller 3 are not specifically described in the embodiments of the present invention.

In the embodiment of the invention, the shell 2 at the other end far away from the impeller 3 is connected with the liquid injection pump 6, the connection can be that the shell 2 is connected with the shell of the liquid injection pump 6, or the shell 2 is provided with a connecting hole, the output port of the liquid injection pump 6 is connected with the connecting hole through a pipeline, so that the liquid medicine conveyed by the liquid injection pump 6 can enter the area where the motor ball bearing 9 is positioned. Preferably, the liquid medicine is kept under a certain pressure in the area where the ball bearing 9 is located. It will be appreciated that the region in which the ball bearing 9 is located communicates with the working region of the impeller 3.

The centrifugal heart pump using the ball bearing provided by the embodiment of the invention uses the ball bearing 9, and keeps the advantages of low manufacturing cost and reliable transmission of the ball bearing 9, on the basis, the liquid injection pump 6 is arranged for injecting liquid medicine between the stator and the rotor, so that the ball bearing 9 can be soaked in the liquid medicine, blood is prevented from entering the ball bearing 9 along a gap between the stator and the rotor to generate thrombus or blood coagulation, in addition, the existence of the liquid medicine can also reduce the mechanical friction of the ball bearing 9, and the heat generation of the ball bearing 9 is reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.