阅读说明：本技术 一种带进出口导叶的植入式磁悬浮轴流血泵 (Implanted magnetic suspension axial flow blood pump with inlet and outlet guide vanes ) 是由 柳阳威 谢楠 唐雨萌 于 2021-09-24 设计创作，主要内容包括：本发明公开了一种带进出口导叶的植入式磁悬浮轴流血泵,包括：透明泵壳组件、前导叶轮、转子叶轮和后导叶轮；所述转子叶轮包括转子叶片、转子叶轮轴、永磁体套筒及内置于永磁体套筒中的永磁体组件,所述转子叶轮与透明泵壳组件的侧边布置有回流狭缝,可为透明泵壳内表面提供有效冲洗,抑制血栓形成；采用包含永磁体套筒的转子叶轮可有效避免叶顶间隙内形成较大的速度梯度,进而缓解血液损伤,避免了传统血泵易形成血栓的缺陷；所采用的内置于永磁体套筒内部的永磁体组件与安装在透明泵壳组件外侧的电磁控制系统之间的距离更近,更利于电磁控制系统对转子叶轮的控制,进而提升血泵的运转稳定性。(The invention discloses an implanted magnetic suspension axial flow blood pump with inlet and outlet guide vanes, which comprises: the transparent pump shell assembly comprises a front guide impeller, a rotor impeller and a rear guide impeller; the rotor impeller comprises rotor blades, a rotor impeller shaft, a permanent magnet sleeve and a permanent magnet assembly arranged in the permanent magnet sleeve, and backflow slits are arranged on the side edges of the rotor impeller and the transparent pump shell assembly, so that effective washing can be provided for the inner surface of the transparent pump shell, and thrombosis can be inhibited; the rotor impeller comprising the permanent magnet sleeve can effectively avoid a larger speed gradient from being formed in a blade top gap, so that blood damage is relieved, and the defect that the conventional blood pump is easy to form thrombus is overcome; the distance between the permanent magnet assembly arranged in the permanent magnet sleeve and the electromagnetic control system arranged outside the transparent pump shell assembly is shorter, so that the electromagnetic control system can control the rotor impeller more conveniently, and the running stability of the blood pump is improved.)

1. An implanted magnetic suspension axial flow blood pump with inlet and outlet guide vanes comprises: the transparent pump shell assembly (1), the front guide impeller (2), the rotor impeller (3) and the rear guide impeller (4); the transparent pump shell assembly (1) is made of polyurethane; the transparent pump shell assembly (1) comprises a front guide impeller pump shell (5), a rotor impeller pump shell (5) and a rear guide impeller pump shell (7); the front guide impeller (2) is positioned in the transparent pump shell assembly (1) and is fixedly connected with the front guide impeller pump shell (5); the front guide impeller (2) comprises front guide impeller blades (8), a front guide cone (9) and a front guide impeller shaft (10), wherein the front guide impeller blades (8) are spiral and are distributed between the front guide impeller pump shell (5) and the front guide impeller shaft (10) at equal intervals in an alternating mode, and 4 blades in total are formed; the rotor impeller is positioned in the transparent pump shell assembly (1), and backflow slits are arranged on the side edges of the rotor impeller and the transparent pump shell assembly (1); the rotor impeller (3) comprises rotor blades (12), a rotor impeller shaft (13), a permanent magnet sleeve (14) and a permanent magnet assembly (15), wherein the permanent magnet assembly (15) is arranged in the permanent magnet sleeve (14), the permanent magnet assembly (15) comprises a front axial annular permanent magnet (16), a radial annular permanent magnet (17) and a rear axial annular permanent magnet (18), the front axial annular permanent magnet (16) and the rear axial annular permanent magnet (18) are used for axially positioning the rotor impeller (3), and the radial annular permanent magnet (17) is used for radially positioning the rotor impeller (3); the rotor blades (12) are spiral and 4 in number, are alternately distributed between the permanent magnet sleeve (14) and the rotor impeller shaft (13) at equal intervals, and are fixedly connected with the permanent magnet sleeve (14) and the rotor impeller shaft (13); the rear guide impeller (4) is positioned in the transparent pump shell assembly (1) and is fixedly connected with the rear guide impeller pump shell (7); the rear guide vane wheel (4) comprises rear guide vane wheel blades (19), a rear guide vane wheel shaft (20) and a rear guide cone (21), wherein the rear guide vane wheel blades (19) are spiral and are distributed between the rear guide vane wheel pump shell (7) and the rear guide vane wheel shaft (20) at equal intervals in an alternating mode, and 4 blades are distributed in total; the front end of the front guide impeller pump shell (5) is a blood inlet (22), and the rear end of the rear guide impeller pump shell (7) is a blood outlet (23).

2. The implantable magnetic levitation axial blood pump with inlet and outlet guide vanes according to claim 1, wherein the inner surface of the transparent pump casing assembly (1), the surface of the leading impeller (2), the surface of the rotor impeller (3) and the surface of the trailing impeller (4) are coated with an anticoagulant coating to reduce the risk of platelet activation, coagulation and thrombus formation.

3. The implantable magnetic suspension axial flow blood pump with inlet and outlet guide vanes according to any one of claims 1 to 2, characterized in that the profile of the leading cone (9) and the leading impeller blades (8) are smoothly transited.

4. The implantable magnetic levitation axial blood pump with inlet and outlet guide vanes according to any one of claims 1 to 2, wherein the axial length of the permanent magnet sleeve (14) is equal to the axial length of the rotor blades (12).

5. The implantable magnetic suspension axial flow blood pump with inlet and outlet guide vanes according to any one of claims 1 to 2, wherein the molded line of the rear guide vane shaft (20) and the rear guide cone (21) are smoothly transited.

Technical Field

The invention relates to the technical field of artificial heart pumps, in particular to an implanted magnetic suspension axial flow blood pump with inlet and outlet guide vanes.

Background

The safety and reliability of artificial hearts have been improved remarkably, but problems of blood compatibility such as hemolysis caused by red blood cell disruption and thrombus formed by activated coagulation of platelets still exist. Solving the problems of hemolysis and thrombus is the key direction of the current artificial heart pump research. Most of the existing axial-flow blood pumps rely on mechanical bearings to fix the axial position and the radial position of a rotor impeller, and due to high-speed rotation, the problems of abrasion, friction heat, blood pollution of a sealing device and the like can be caused for the mechanical bearings, so that thrombus is easily generated, and the life of a patient is harmed; in terms of a flow field, the rotor impeller rotates at a high speed to form a strong gap leakage vortex, and a large shearing stress is generated at a blade tip gap, so that a red blood cell membrane is easily broken to cause severe hemolysis and blood damage. Therefore, there is a need to improve the blood compatibility of blood pumps by modifying the design to reduce the shear stress and vortex strength within the blood pump.

Disclosure of Invention

The invention aims to provide an implanted magnetic suspension axial flow blood pump with inlet and outlet guide vanes, which can provide medium and long-term circulation support, reduce blood damage of a patient, ensure the life safety of the patient and further reduce the clinical mortality.

The technical scheme adopted by the invention is as follows: an implanted magnetic suspension axial flow blood pump with inlet and outlet guide vanes comprises: the transparent pump shell assembly comprises a front guide impeller, a rotor impeller and a rear guide impeller; the transparent pump shell assembly is made of polyurethane; the transparent pump shell assembly comprises a front guide impeller pump shell, a rotor impeller pump shell and a rear guide impeller pump shell; the front guide impeller is positioned in the transparent pump shell assembly and is fixedly connected with the pump shell of the front guide impeller; the front guide impeller comprises front guide impeller blades, a front guide cone and a front guide impeller shaft, wherein the front guide impeller blades are spiral and are distributed between the front guide impeller pump shell and the front guide impeller shaft at equal intervals in an alternating mode, and the number of the front guide impeller blades is 4; the rotor impeller is positioned in the transparent pump shell assembly, and backflow slits are arranged on the side edges of the rotor impeller and the transparent pump shell assembly; the rotor impeller comprises rotor blades, a rotor impeller shaft, a permanent magnet sleeve and a permanent magnet assembly, wherein the permanent magnet assembly is arranged in the permanent magnet sleeve, the permanent magnet assembly comprises a front axial annular permanent magnet, a radial annular permanent magnet and a rear axial annular permanent magnet, the front axial annular permanent magnet and the rear axial annular permanent magnet are used for axially positioning the rotor impeller, and the radial annular permanent magnet is used for radially positioning the rotor impeller; the rotor blades are spiral and are 4 in number, and are alternately distributed between the permanent magnet sleeve and the rotor impeller shaft at equal intervals, and the rotor blades are fixedly connected with the permanent magnet sleeve and the rotor impeller shaft; the rear guide impeller is positioned in the transparent pump shell assembly and is fixedly connected with the pump shell of the rear guide impeller; the rear guide vane wheel comprises rear guide vane wheel blades, a rear guide vane wheel shaft and a rear guide cone, wherein the rear guide vane wheel blades are spiral and are distributed between the rear guide vane wheel pump shell and the rear guide vane wheel shaft at equal intervals in an alternating mode, and 4 rear guide vane wheel blades are distributed between the rear guide vane wheel pump shell and the rear guide vane wheel shaft at equal intervals; the front end of the front guide impeller pump shell is a blood inlet, and the rear end of the rear guide impeller pump shell is a blood outlet.

Further, the inner surface of the transparent pump casing assembly, the surface of the leading impeller, the surface of the rotor impeller and the surface of the trailing impeller are sprayed with an anti-coagulant coating to reduce the risk of platelet activation coagulation to form thrombus.

Furthermore, the molded line of the front guide cone and the front guide impeller shaft are in smooth transition.

Further, the axial length of the permanent magnet sleeve is equal to the axial length of the rotor blade.

Furthermore, the molded line of the rear guide impeller shaft and the rear guide cone are in smooth transition.

The invention has the beneficial effects that: according to the implantable magnetic suspension axial flow blood pump with the inlet and outlet guide vanes, the rotor impeller comprising the permanent magnet sleeve is adopted to replace the traditional rotor impeller, and a large speed gradient can be effectively prevented from being formed in the blade top gap through the connection form of magnetic suspension, so that the blood damage is relieved, effective washing is provided for the inner surface of the transparent pump shell, and the formation of thrombus is inhibited; the defects of bearing friction loss, blood pollution and thrombus formation caused by fixing the axial and radial positions of a rotor impeller by a mechanical bearing in the traditional blood pump design are avoided; the distance between the permanent magnet assembly arranged in the permanent magnet sleeve and the electromagnetic control system arranged outside the transparent pump shell assembly is shorter, so that the electromagnetic control system can control the rotor impeller more conveniently, and the running stability of the blood pump is improved.

Drawings

FIG. 1 is a cross-sectional view of the apparatus of the present invention;

FIG. 2 is a front view of the apparatus of the present invention;

FIG. 3 is a front view of the apparatus of the present invention;

FIG. 4 is a rear view of the apparatus of the present invention;

FIG. 5 is a front view of the leading impeller of the present invention;

FIG. 6 is a drawing of a back guide vane wheel according to the present invention;

FIG. 7 is a view of a rotor wheel according to the present invention;

FIG. 8 is a diagram of a permanent magnet sleeve according to the present invention;

FIG. 9 is a schematic view of the internal flow of the present invention;

wherein, 1: a transparent pump housing assembly; 2: a leading impeller; 3: a rotor impeller; 4: a back guide impeller; 5: a leading impeller pump casing; 6: a rotor impeller pump housing; 7: a rear guide impeller pump shell; 8: a leading impeller blade; 9: a leading cone; 10: a leading impeller shaft; 11: a reflow slit; 12: a rotor blade; 13: a rotor impeller shaft; 14: a permanent magnet sleeve; 15: a permanent magnet assembly; 16: a front axial annular permanent magnet; 17: a radial annular permanent magnet; 18: a rear axial annular permanent magnet; 19: a back guide impeller blade; 20: a back guide impeller shaft; 21: a rear guide cone; 22: a blood inlet; 23: and (4) a blood outlet.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, which are included by way of illustration and not by way of limitation.

As shown in fig. 1 and fig. 2, an implantable magnetic suspension axial blood pump with inlet and outlet guide vanes includes: the transparent pump shell assembly comprises a transparent pump shell assembly 1, a front guide impeller 2, a rotor impeller 3 and a rear guide impeller 4; the transparent pump shell assembly 1 is made of polyurethane; the transparent pump shell assembly 1 comprises a front guide impeller pump shell 5, a rotor impeller pump shell 6 and a rear guide impeller pump shell 7; the front guide impeller 2 is positioned in the transparent pump shell assembly 1 and is fixedly connected with the front guide impeller pump shell 5; the front guide impeller 2 comprises front guide impeller blades 8, a front guide cone 9 and a front guide impeller shaft 10, wherein the front guide impeller blades 8 are spiral and are distributed between a front guide impeller pump shell 5 and the front guide impeller shaft 10 at equal intervals in an alternating mode, and 4 blades are distributed in total; the rotor impeller 3 is positioned in the transparent pump shell assembly 1, the side edges of the rotor impeller 3 and the transparent pump shell assembly 1 are provided with the backflow slits 11, the width of the backflow slits 11 is 0.5-1.5 mm, the flow of blood in the backflow slits 11 is mainly influenced by the pressure difference between the upstream and the downstream of the rotor impeller 3, and the flow turning parts of the backflow slits 11 adopt a rounding design, so that the flow separation is effectively reduced, the vortex intensity is reduced, and the blood compatibility at the backflow slits 11 is improved; under the clinical working condition, the blood in the backflow slit 11 can effectively flush the wall surface, so that the risk of thrombogenesis due to platelet activation is reduced; the rotor impeller 3 comprises rotor blades 12, a rotor impeller shaft 13, a permanent magnet sleeve 14 and a permanent magnet assembly 15, wherein the permanent magnet assembly 15 is arranged in the permanent magnet sleeve 14, and the permanent magnet assembly 15 comprises a front axial annular permanent magnet 16, a radial annular permanent magnet 17 and a rear axial annular permanent magnet 18, wherein the front axial annular permanent magnet 16 and the rear axial annular permanent magnet 18 are used for axially positioning the rotor impeller 3, and the radial annular permanent magnet 17 is used for radially positioning the rotor impeller 3, so that the running stability of the rotor impeller 3 is guaranteed, the width change of a backflow slit 11 caused by oscillation generated when the rotor impeller 3 rotates is avoided, and the generation of hemolysis caused by overlarge speed gradient caused by gap change is inhibited; the rotor blades 3 are spiral and 4 in number, and are alternately distributed between the permanent magnet sleeve 14 and the rotor impeller shaft 13 at equal intervals, and the rotor blades 12 are fixedly connected with the permanent magnet sleeve 14 and the rotor impeller shaft 13; the rear guide impeller 4 is positioned in the transparent pump shell assembly 1 and is fixedly connected with a rear guide impeller pump shell 7; the rear guide impeller 4 comprises rear guide impeller blades 19, a rear guide impeller shaft 20 and a rear guide cone 21, wherein the rear guide impeller blades 19 are spiral and are distributed between the rear guide impeller pump shell 7 and the rear guide impeller shaft 20 at equal intervals in an alternating mode, and 4 blades are distributed in total; the front end of the front guide impeller pump shell 5 is a blood inlet 22, and the rear end of the rear guide impeller pump shell 5 is a blood outlet 23.

The inner surface of the transparent pump housing assembly 1, the surface of the leading impeller 2, the surface of the rotor impeller 3 and the surface of the trailing impeller 4 are coated with an anti-coagulant coating to reduce the risk of platelet-activated coagulation to form thrombi.

The molded line of the leading cone 9 and the leading impeller shaft 10 are smoothly transited, so that the separation of the flow at the position with larger curvature is avoided.

The axial length of the permanent magnet sleeve 14 is equal to the axial length of the rotor blade 12.

The molded line of the rear guide impeller shaft 20 and the rear guide cone 21 are smoothly transited, so that the separation of the flow at the position with larger curvature is avoided.

As shown in fig. 3 and 4, the projection fan angles of the leading impeller blade 8 and the trailing impeller blade 19 are the same and are both smaller than 90 °. As shown in fig. 5 and 6, the leading impeller blades 8 have 4 blades in total and the same size, and the trailing impeller blades 10 have 4 blades in total and the same size. As shown in fig. 7 and 8, the rotor blades 12 have 4 pieces in total and are the same in size; the permanent magnet sleeve 14 is a circular tube with equal thickness, and the axial dimensions of the permanent magnet sleeve 14 and the rotor blade 12 are equal.

Specifically, as shown in fig. 9, blood flows into the blood pump axially from the blood inlet 22, flows into the leading impeller 2 under the guidance of the leading cone 9, changes the flow direction under the action of the leading impeller blades 8, flows into the rotor impeller 3 at a proper flow angle, flows through the trailing impeller 4 after being accelerated and pressurized in the rotor impeller 3, and readjusts the flow direction to be axial, and finally flows out of the blood pump through the blood outlet 23; after a small part of blood flows out of the rotor impeller 3, under the influence of the pressure difference between the upstream and downstream of the rotor impeller 3, the blood flows back to the front side of the rotor impeller 3 again through the backflow slit 11, joins with the main flow, and flows into the rotor impeller 3 again.

The first embodiment is as follows: stable cycle conditions in clinic

In a clinical stable circulation condition, blood axially flows into the blood pump from the blood inlet 22, flows into the front guide impeller 2 under the guidance of the front guide cone 9, changes the flow direction under the action of the front guide impeller blades 8, and flows into the rotor impeller 3 at a proper liquid flow angle. The rotation of the rotor impeller 3 is controlled by an electromagnetic system outside the pump, the front axial annular permanent magnet 16, the radial annular permanent magnet 17 and the rear axial annular permanent magnet 18 are controlled by corresponding electromagnetism, the axial position of the rotor impeller 3 is controlled by controlling the front axial annular permanent magnet 16 and the rear axial annular permanent magnet 18, the radial position of the rotor impeller 3 is controlled by controlling the radial annular permanent magnet 17, the stability of the rotor impeller 6 during rotation is ensured, blood flows through the rear guide impeller 4 after being accelerated and pressurized in the rotor impeller 3, the flow direction is readjusted to be axial, flows through the rear guide cone 21, and finally flows out of the blood pump through a blood outlet 23; after a small part of blood flows out of the rotor impeller 3, the blood is influenced by the high pressure at the downstream of the rotor impeller 3 and the low pressure at the upstream of the rotor impeller 3, flows back to the front side of the rotor impeller 3 again through the backflow slit 11, is merged with the main flow at the front side of the rotor impeller 3, and flows into the rotor impeller 3 again. In the return slit 11, the flow state of blood is influenced by the rotation of the rotor impeller 3 and rotates at a constant circumferential speed in the same direction as the rotor impeller 3; the direction of the centrifugal force applied to the blood is vertical to the direction of the pressure difference between the front side and the rear side of the rotor impeller 3, so that the axial backflow speed of the blood in the backflow slit 11 is not influenced by the rotation of the rotor impeller 3, the backflow slit 11 is washed, and the generation of thrombus in the backflow slit 11 is inhibited.

Example two: machine removal state

In a machine withdrawal state, the implanted magnetic suspension axial flow blood pump with the inlet and outlet guide vanes maintains the operation process in the first embodiment, gradually reduces the rotating speed of the rotor impeller 3 by monitoring the human body circulation signs, and gradually reduces the blood flow until the blood flow is zero; and after the human body completely recovers the autonomous circulation, removing the blood pump, and finishing machine withdrawal.

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, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.