阅读说明：本技术 一种可实现大流量脉动输出的嵌套式多级并联血泵 (Nested multistage parallel blood pump capable of realizing large-flow pulsation output ) 是由 王帅 李阁强 李东林 董振乐 祁玉洁 于 2021-08-11 设计创作，主要内容包括：本发明公开了一种可实现大流量脉动输出的嵌套式多级并联血泵,包括环形的外层血泵I,外层血泵I内侧嵌套安装有内层血泵II；外层血泵I和内层血泵II分别连接有驱动系统；外层血泵I和内层血泵II在后端开始分别输送血液,并在前端进行血液的并联合流。本发明具有两级嵌套式结构,内外层血泵均可单独控制,两级血泵的流量在出口处合流,由于两级血泵为并联式结构,因此通过合理设计水力结构可在合理控制扬程的情况下产生大流量脉动,且两级均可独立控制,以使血泵工作在需要的工况下。(The invention discloses a nested multistage parallel blood pump capable of realizing large-flow pulse output, which comprises an annular outer blood pump I, wherein an inner blood pump II is nested and installed on the inner side of the outer blood pump I; the outer blood pump I and the inner blood pump II are respectively connected with a driving system; the outer blood pump I and the inner blood pump II respectively convey blood at the rear end, and the blood is subjected to parallel confluence at the front end. The invention has a two-stage nested structure, the inner and outer blood pumps can be controlled independently, the flow of the two-stage blood pumps is converged at the outlet, and the two-stage blood pumps are of a parallel structure, so that the large flow pulsation can be generated under the condition of reasonably controlling the lift by reasonably designing a hydraulic structure, and the two stages can be controlled independently, so that the blood pumps work under the required working condition.)

1. A nested multistage parallel blood pump capable of realizing large-flow pulse output is characterized by comprising an annular outer blood pump (I), wherein an inner blood pump (II) is nested and mounted on the inner side of the outer blood pump (I); the outer blood pump (I) and the inner blood pump (II) are respectively connected with a driving system; the outer blood pump (I) and the inner blood pump (II) respectively convey blood at the rear ends, and carry out parallel confluence of the blood at the front ends; when the lift needs to be controlled, the lifts of the outer-layer blood pump (I) and the inner-layer blood pump (II) are controlled to be consistent, and the lift of the blood is the lift of the outer-layer blood pump (I) and the inner-layer blood pump (II); when the blood flow meter works under a pulsation working condition, the rotating speeds of the outer layer blood pump (I) and the inner layer blood pump (II) are respectively controlled, and the sum of the total blood flow of the outer layer blood pump (I) and the total blood flow of the inner layer blood pump (II) is measured by the blood flow meter.

2. The nested multistage parallel blood pump capable of achieving high-flow pulsatile output according to claim 1, wherein the inner blood pump (II) comprises a mounting shaft (20), a second-stage impeller (18) is coupled to the middle of the mounting shaft (20) in a shaft manner, a second-stage front guide vane (12) is fixed to the front end of the mounting shaft, and a second-stage rear guide vane (21) is fixed to the rear end of the mounting shaft; a second-stage twisted blade (17) is fixed on the second-stage impeller (18); the second-stage twisted blades (17) are sleeved with a second-stage installation pipeline (23) fixedly connected with the installation shaft (20), a second-stage drive coil (16) is fixed on the inner side of the second-stage installation pipeline (23), and a cylindrical rubidium magnet (19) matched with the second-stage drive coil (16) is installed on the second-stage impeller (18).

3. The nested multistage parallel blood pump capable of achieving high-flow pulsatile output according to claim 2, wherein the second-stage rear guide vanes (21) are provided with second-stage curved blades (22), and the second-stage front guide vanes (12) are provided with straight blades.

4. The nested multistage parallel blood pump capable of achieving high-flow pulsatile output according to claim 2, wherein the outer blood pump (I) comprises a first-stage impeller (4) coupled to the middle of a second-stage mounting tube (23); a first-stage front guide vane (11) is fixed at the front end of the second-stage installation pipeline (23), and a first-stage rear guide vane (1) is fixed at the rear end; a first-stage twisted blade (5) is fixed on the first-stage impeller (4); second grade installation pipeline (23) overcoat is equipped with one-level installation pipeline (9) with second grade installation pipeline (23) fixed connection, and one-level installation pipeline (9) inboard is fixed with one-level drive coil (7), is fixed with annular rubidium magnet (3) of one-level drive coil (7) complex on one-level impeller (4).

5. The nested multistage parallel blood pump capable of achieving high-flow pulsating output according to claim 4, wherein the one-stage rear guide vane (1) is provided with one-stage curved blades (2), and the one-stage front guide vane (11) is provided with straight blades.

6. The nested multistage parallel blood pump capable of achieving high-flow pulsatile output according to claim 4, wherein the secondary drive coils (16) and the primary drive coils (7) are wound with silicon steel sheets.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a parallel two-stage axial flow type blood pump with an inner-layer nested structure and an outer-layer nested structure, which has the advantages of compact structure, wide flow pulsation range and strong physiological adaptability.

Background

Heart failure is one of the main diseases endangering human health at present, patients suffering from heart failure also increase year by year with the aging and the exacerbation of population, and a blood pump is an effective means for treating the heart failure under the condition of insufficient heart donors.

The existing blood pumps are divided into axial flow type blood pumps and centrifugal type blood pumps, and the working principle of the existing blood pumps is that blood is conveyed through rotation of an impeller. However, the constant flow output mode is generally adopted, and researches show that the body can lack blood pulsation under the mode for a long time, so that the physiological problems of aortic insufficiency, gastrointestinal hemorrhage and the like can be caused.

In order to solve the problems caused by the constant flow output of the blood pump, the rotary blood pump needs to output pulsating flow through the change of the rotating speed, but the existing research shows that the flow pulsation similar to the human body needs to be generated, and the pulsating flow needs to reach 15L/min. If the flow design index is simply improved, and the conventional axial flow pump and the centrifugal pump are designed, the volume of the blood pump can be greatly increased, and the flow and the lift cannot meet the requirements simultaneously under the condition that certain blood is supplied at a constant rotating speed.

The patent CN112807564A 'a minimally invasive interventional artificial heart axial flow blood pump' discloses a minimally invasive interventional artificial heart axial flow blood pump which has a micro structure, but because of adopting a single impeller structure, the pulsating flow of the pump is difficult to meet the requirements of human bodies; therefore, the pulse blood pump provides higher requirements for the volume, can realize flexible regulation of output flow and pressure, and the existing blood pump is difficult to meet the requirements. Patent CN213527129U "an artificial heart pump with magnetic suspension structure" discloses a blood pump structure combining centrifugation and axial flow, in which an axial flow pump and a centrifugal blood pump are connected in series; the patent CN201721292780, "a concentric multistage centrifugal pump", discloses a concentric multistage centrifugal pump, which includes a concentric two-stage impeller structure, the two-stage impellers share the same inlet flow channel, and a series pump form is formed inside a volute, liquid entering the pump is accelerated sequentially by an inner impeller and an outer impeller, so that the pump lift of the pump can be increased, but the requirement for increasing the pulsating flow cannot be met, and because the two-stage impellers are not effectively isolated, the flow fields of the two-stage impellers affect each other in the volute, an unstable flow state is generated, and indexes such as efficiency and hemolysis are adversely affected, so the structure is not suitable for the design requirement of the high-flow blood pump provided by the present invention; in addition, a two-stage axial flow blood pump structure is also provided in the thesis of numerical simulation research on blood damage inside a two-stage axial flow blood pump in the process of heart failure pulsation, and due to principle limitation, pumps of the same specification are connected in series only to increase the lift and not to increase the flow output, so that the requirement of large-flow pulsation output cannot be met. Therefore, a blood pump structure which has a compact structure and can realize large-flow pulsation needs is provided for meeting the large-flow pulsation requirements.

Disclosure of Invention

In order to solve the problems, the invention provides a nested multistage parallel blood pump capable of realizing large-flow pulse output. The invention has a two-stage nested structure, the inner and outer blood pumps can be controlled independently, the flow of the two-stage blood pumps is converged at the outlet, and the two-stage blood pumps are of a parallel structure, so that the large flow pulsation can be generated under the condition of reasonably controlling the lift by reasonably designing a hydraulic structure, and the two stages can be controlled independently, so that the blood pumps work under the required working condition.

In order to achieve the technical effects, the technical scheme of the invention is as follows:

a nested multistage parallel blood pump capable of realizing large-flow pulse output comprises an annular outer blood pump I, wherein an inner blood pump II is nested and mounted on the inner side of the outer blood pump I; the outer blood pump I and the inner blood pump II are respectively connected with a driving system; the outer blood pump I and the inner blood pump II respectively convey blood at the rear end, and carry out parallel confluence of the blood at the front end; when the lift needs to be controlled, the lifts of the outer-layer blood pump I and the inner-layer blood pump II are controlled to be consistent, and the lift of blood is the lift of the outer-layer blood pump I and the lift of the inner-layer blood pump II; when the blood flow meter works under the pulsation working condition, the sum of the rotating speeds of the outer-layer blood pump I and the inner-layer blood pump II, the total blood flow of the outer-layer blood pump I and the total blood flow of the inner-layer blood pump II of the blood flow meter are respectively controlled to adjust the blood flow.

The inner blood pump II comprises an installation shaft, the middle part of the installation shaft is connected with a second-stage impeller in a shaft mode, a second-stage front guide vane is fixed at the front end of the installation shaft, and a second-stage rear guide vane is fixed at the rear end of the installation shaft; a second-stage twisted blade is fixed on the second-stage impeller; the second grade distortion blade overcoat is equipped with the second grade installation pipeline with installation axle fixed connection, and second grade installation pipeline inboard is fixed with the second grade drive coil, installs the cylindrical rubidium magnet with second grade drive coil complex on the second grade impeller.

The improved structure is characterized in that a second-stage bent blade is arranged on the second-stage rear guide blade, and a straight blade is arranged on the second-stage front guide blade.

In a further improvement, the outer-layer blood pump I comprises a first-stage impeller which is coupled in the middle of a second-stage mounting pipeline in a shaft manner; a first-stage front guide vane is fixed at the front end of the second-stage installation pipeline, and a first-stage rear guide vane is fixed at the rear end of the second-stage installation pipeline; a first-stage twisted blade is fixed on the first-stage impeller; the second grade installation pipeline overcoat is equipped with the one-level installation pipeline with second grade installation pipeline fixed connection, and one-level installation pipeline inboard is fixed with the one-level drive coil, is fixed with one-level drive coil complex annular rubidium magnet on the one-level impeller.

In a further improvement, the first-stage rear guide vane is provided with a first-stage curved blade, and the first-stage front guide vane is provided with a straight blade.

In a further improvement, the secondary drive coil and the primary drive coil are wound with silicon steel sheets.

The invention has the advantages that:

have two-stage nested formula structure, the equal independent control of ectonexine blood pump, the flow of two-stage blood pump is in the exit confluence, because the two-stage blood pump is the parallel structure, consequently can produce large-traffic pulsation under the condition of reasonable control lift through rational design hydraulic structure, and the equal independent control of two-stage to make the blood pump work under the operating mode of needs.

Drawings

FIG. 1 is an overall profile of a nested multistage parallel blood pump;

FIG. 2 is a schematic diagram of the inner and outer layer structures of a nested multistage parallel blood pump;

FIG. 3 is a perspective cross-sectional view of a nested multistage parallel blood pump shaft;

fig. 4 is an axial cross-sectional view of a nested multistage parallel blood pump.

Wherein, outer blood pump I, inlayer blood pump II, guide vane 1 behind the one-level, one-level crooked blade 2, annular rubidium magnet 3, one-level impeller 4, one-level distortion blade 5, inner ring bearing 6, one-level drive coil 7, one-level silicon steel sheet 8, one-level installation pipeline 9, straight blade 10, one-level front guide vane 11, second grade front guide vane 12, second grade silicon steel sheet 15, second grade drive coil 16, second grade distortion blade 17, second grade impeller 18, cylindrical rubidium magnet 19, installation axle 20, guide vane 21 behind the second grade, second grade crooked blade 22, second grade installation pipeline 23.

Detailed Description

The overall appearance of the nested multistage parallel blood pump is shown in figure 1, and according to the figure 2, the nested multistage parallel blood pump consists of an inner blood pump and an outer blood pump, wherein the outer blood pump I is of an annular structure, the inner blood pump II is arranged in the inner space of the outer blood pump I in a nested structure mode, and the two blood pumps respectively contain independent driving systems, so that the independent driving and control of the two blood pumps can be realized.

As shown in fig. 3, the outer blood pump I designed by the present invention mainly comprises a first-stage rear guide vane 1, a first-stage impeller 4 and a first-stage front guide vane 11, wherein the first-stage rear guide vane 1 is of an annular structure, and a first-stage curved blade 2 for correcting flow field distribution is installed on the surface of the first-stage rear guide vane 1; the first-stage impeller 4 is also of a hollow annular structure, the first-stage twisted blades 5 are arranged on the first-stage impeller 4, and the first-stage impeller 4 can convey blood through rotation; the first-stage front guide vane 11 is also of an annular structure, and is provided with straight blades 10 for correcting the distribution of the flow field; in addition, the annular rubidium magnet 3 is arranged in the primary impeller 4 and used for driving the impeller to rotate under the driving of a magnetic field; inner circle bearing 6 is still installed to the one-level impeller inboard, the stator before the one-level, stator and inner circle bearing 6 are installed outside inlayer blood pump II's second grade installation pipe 23 after the one-level, one-level impeller 4 cooperates with inner circle bearing 6 with interference fit's form, include one-level installation pipeline 9 in outer blood pump I's the outside, install one-level silicon steel sheet 8 and one-level drive coil 7 in the inboard of one-level installation pipeline 9, the drive coil can produce alternating magnetic field after the circular telegram, and then the impeller of the outer blood pump of drive is rotatory.

As shown in fig. 3 and 4, the inner blood pump designed by the present invention mainly comprises a second-stage rear guide vane 21, a second-stage impeller 18 and a second-stage front guide vane 12, wherein the surface of the second-stage rear guide vane 21 is provided with a second-stage curved blade 22 for correcting the flow field distribution; the secondary impeller 18 is provided with a secondary twisted blade 17, and the secondary impeller 18 can convey blood through rotation; in addition, a cylindrical rubidium magnet 19 is arranged in the secondary impeller 18 and is used for driving the impeller to rotate under the driving of a magnetic field; the second-stage front guide vanes 12 and the second-stage rear guide vanes 21 are fixedly arranged inside the mounting pipe 23 of the inner-layer blood pump II, the second-stage impeller 18 is matched with the second-stage front guide vanes 12 and the second-stage rear guide vanes 21 through a mounting shaft, and the second-stage impeller 18 and the mounting shaft 20 are in clearance fit; the inner-layer blood pump II comprises a second-stage installation pipeline 23, a second-stage silicon steel sheet 15 and a second-stage driving coil 16 are installed on the inner side of the second-stage installation pipeline 23, and the driving coil can generate an alternating magnetic field after being electrified so as to drive an impeller of the inner-layer blood pump to rotate.

The working process of the nested parallel blood pump is further explained by combining fig. 2 and fig. 3, when the nested parallel blood pump works, blood enters the outer-layer blood pump I and the inner-layer blood pump II from the first-stage front guide vane 11 and the second-stage front guide vane 12 respectively, the first-stage driving coil 7 and the second-stage driving coil 16 are electrified to generate an alternating magnetic field, the first-stage impeller 4 and the second-stage impeller 18 are driven by the magnetic field to rotate, the blood is conveyed to the first-stage rear guide vane 1 and the second-stage rear guide vane 21, the output of the inner-layer blood pump and the output of the outer-layer blood pump are combined in parallel at the rear guide vane, and under the condition that the rated flow and the lift of the inner-layer blood pump and the rated flow of the outer-layer blood pump are consistent, the superposition of the output rated flow of the inner-layer blood pump and the output rated lift of the outer-layer blood pump are consistent. When the blood pump needs to work under the pulsation working condition, the superposition of the flow output of the inner-layer and outer-layer blood pumps can be realized by reasonably and independently controlling the rotating speeds of the first-stage impeller 4 and the second-stage impeller 18, so that larger flow pulsation is generated, and the working rotating speed of the two-stage blood pump can be independently adjusted according to actual working condition requirements.

The above description is only one specific guiding embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention using this concept shall fall within the scope of the invention.